JPH0337169B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a camera, more specifically, a partial photometering means, each luminance value of a subject measured by the partial photometry means, and arithmetic operations on each luminance value. The present invention relates to a camera that displays the calculation result values obtained by each calculation.

As is well known, the photometry methods used in conventional cameras are broadly divided into average photometry methods and spot photometry methods.

The above average photometry method can be further divided into full-screen average photometry method and center-weighted average photometry method.
Generally, center-weighted average photometry is used. This average metering method provides acceptable results for ordinary subjects, so it is easier to use than the partial metering method, and is used in most general cameras.

The partial metering method described above is effective when you want to adjust the exposure to one of the objects with a large brightness ratio, but the disadvantages are that it is cumbersome to operate and there is a high risk of taking an incorrectly exposed photograph. There is.

In this way, it can be said that the average photometry method is a better method than the partial photometry method for photographing ordinary subjects.

However, in reality, there are not only subjects with a low contrast ratio, but also many subjects with a large contrast ratio, such as backlit subjects, subjects in stage photography, subjects with compositions looking out of a window, etc. . In particular, the more the photographer's technique improves, the more
Opportunities to photograph such objects with a large contrast ratio increase. However, when shooting a subject with a large contrast ratio with an automatic exposure camera that uses average metering, the exposure is controlled based on the averaged subject brightness, so one of the subjects with a large contrast ratio is It is not possible to fully reflect the photographer's intention when creating an image, such as when wanting to adjust the exposure.

Therefore, conventionally, when photographing such a special subject, a so-called spot exposure meter with an extremely narrow metering angle is used to measure the light at multiple locations on the subject, and the obtained subject brightness and The aperture,
Exposure factors such as shutter speed were determined, and the camera was manually operated to take photographs. In addition, when you can get close to the subject, such as in a studio shoot, you can measure the light at multiple desired locations on the subject using an incident light exposure meter, determine the exposure factors in the same way, and then take pictures using manual operation. I was doing it.

However, this method of determining exposure factors by performing partial metering using a light meter that is separate from the camera has the drawbacks of being cumbersome and time-consuming, and requiring complex calculations. Ta.

Therefore, a partial photometry means is provided so that partial photometry can be easily performed, and each brightness value obtained by this photometry and the calculation result value obtained by performing calculations on each brightness value are displayed respectively. Cameras that do this have already been proposed. This camera is superior in that it does not require a separate exposure meter, that complex calculations are automatically performed, and that partially measured luminance values and their calculated values are displayed simultaneously. However, in conventional cameras of this type, the film sensitivity value and exposure compensation value were input into the camera by operating the same setting member.
When exposure compensation was applied, the display of both the partial photometry brightness value and the calculation result value changed. For this reason, although a partial photometric brightness value is displayed, it cannot be said to be a partial photometric brightness value display in an accurate sense. Originally, exposure compensation only needs to work on the calculation result value, which is the expected exposure value, so in order to display the partial metering brightness value as the correct brightness value, exposure compensation must not work on the partial metering brightness value. It is desirable to do so.

In view of the above-mentioned points, an object of the present invention is to display, when an exposure compensation operation is performed, each partial photometry luminance value without taking into account the correction value based on the exposure compensation operation, and to display the calculated result value. The object of the present invention is to provide a camera that performs display taking correction values into consideration.

According to the present invention, when an exposure compensation operation is performed, the brightness value is displayed as is, and only the display of the calculation result value is changed based on the exposure compensation value.
In the brightness distribution of a plurality of given partial photometric values, only the calculation result value, that is, the expected exposure value can be shifted.

Hereinafter, the present invention will be explained based on an illustrated embodiment.

FIGS. 1 and 2 show a front view and a plan view, respectively, of a camera showing an embodiment of the present invention. This camera 10 is a so-called single-lens reflex camera, and has a photographic lens barrel 2 removably attached to the center of the front surface of the camera body 1, and a pentaprism housing 3 in the center of the top surface. It has a protruding triangular roof shape. As is well known, the photographic lens barrel 2 houses and holds a photographic lens 4, and on the outer periphery of the lens barrel 2, from the front to the rear, there is an aperture value setting ring 5, a photographing distance A setting ring 6 and a manual shutter seconds setting ring 7 are arranged in sequence so as to be rotatable. Further, on the upper surface of the camera body 1, in the left half partitioned by the pentaprism storage section 3, a film winding lever 8, a film frame number display window 9, a shutter release button 11, and a self-timer command operation knob 12 are provided. , a memory command operation knob 13, a spot input button 14, a highlight command button 15, and a shadow command button 16, respectively. On the other hand, on the right half of the top surface of the camera body 1, a film rewind knob 17, a film sensitivity setting dial 18,
A film sensitivity display window 19, a photographing mode switching operation knob 21, an exposure correction operation knob 22, and a battery check display window 23 are provided. In addition, the pentaprism storage section 3
A strobe mounting shoe 24 is provided near the rear end of the top surface, and a strobe (not shown) is provided near the upper right end of the front surface of the camera body 1.
A connector 25 is provided for connecting through a connecting cord (not shown). In FIGS. 1 and 2, reference numeral 26 designates an operation button for attaching the photographing lens barrel 2 to the camera body 1.
Reference numeral 7 indicates a metal fitting for attaching a strap (not shown) to the camera body 1, and 28 indicates a viewfinder eyepiece window frame.

The memory command operation knob 13 is rotatably arranged at the base of the pedestal of the shutter release button 11.
"MEMORY" written on the top of the camera body 1
The indicator written on the knob 13 is stopped at an intermediate position between the indicator and the "CLEAR" indicator. This memory command operation knob 13 is an operation member for selecting or canceling a memory photography mode (hereinafter simply referred to as memory mode) in which multiple frames are photographed at an exposure level once stored. At the same time, the memory switch described later
SW ₆ (see Figure 7) and clear switch SW ₇
(See Figure 7). Rotate the memory command operation knob 13 to set the same knob 1.
If you match the 3rd indicator to the “MEMORY” indicator,
When memory switch SW ₆ is closed and memory shooting mode is selected, and the "CLEAR" index is aligned, clear switch SW ₇ is closed and memory shooting mode is canceled. When the rotational force is removed from the operation knob 13, the knob 13 automatically returns to its normal position by its own habit, but the memory photographing mode and the state in which it is released are maintained as they are. This point will be explained in detail later in the explanation of FIG.

The spot input button 14 allows the camera 10 to input the luminance value of the subject partially metered through the photographic lens 4.
This is a self-reset type push button that serves to input and memorize an input into the electric circuit, and is designed to be linked to a spot input switch _SW8 (see FIG. 7), which will be described later. When this spot input button 14 is pressed, the spot input switch SW ₈ is closed and the spot shooting mode is selected, which controls the exposure level based on the stored partial metering value.At the same time, the partial metering brightness value is is beginning to be remembered. When the spot input button 14 is pressed a plurality of times, the partially photometered luminance value is stored each time, and a plurality of photometry values are held in the camera 10. Note that the spot photographing mode is not canceled by the self-resetting of the spot input button 14, and the photographing mode is canceled in conjunction with the completion of one photographing operation.

The highlight command button 15 is set to 2 1/3 from the maximum luminance value of the partial photometry values stored by operating the spot input button 14 as a reference.
Highlight reference shooting mode (hereinafter simply referred to as highlight mode) in which exposure is performed at an exposure value lower by Ev. ) is a self-returning push button for selecting a button (see FIG. 7), and is linked to a highlight switch SW ₉ (see FIG. 7), which will be described later. When the highlight command button 15 is pressed an odd number of times, the highlight mode is selected, and when it is pressed an even number of times, the highlight mode is canceled. Further, the shadow command button 16 is the same as the spot input button 1.
Based on the lowest luminance value of the partial metering values stored in step 4, select a shadow reference shooting mode (hereinafter simply referred to as "shadow mode") in which exposure is performed at an exposure value 2 2/3 Ev higher than this value. This is a self-resetting type push button for the purpose of operation, and is designed to be linked to a shadow switch SW ₁₀ (see Fig. 7), which will be described later. When the shadow command button 16 is pressed an odd number of times, a shadow mode is selected, and when it is pressed an even number of times, the shadow mode is canceled. In addition, the above highlight command button 1
5 and the shadow command button 16 are pressed, if the partial photometry value is not stored, the highlight mode and the shadow mode are not selected. Also, if the shadow command button 16 is pressed in the highlight mode, the highlight mode is canceled and the shadow mode is selected, and if the highlight command button 15 is pressed in the shadow mode, the shadow mode is selected. is now canceled and highlight mode is selected.

The shooting mode switching operation knob 21 is rotatably arranged at the base of the pedestal of the film rewind knob 17, and is provided with "MANUAL", "OFF", "AUTO" written on the top surface of the camera body 1. Click stops are applied at positions corresponding to the indicators ``'' and ``CHECK'' to temporarily stop the operation. This shooting mode switching operation knob 21 is a manual switch _SW3 .
(See Figure 7), Auto switch SW ₄ (See Figure 7)
and battery check switch SW ₅ (1st
When the operating knob 21 is set to correspond to the "MANUAL" index, the manual switch SW ₃ is closed and the shutter is activated at the manually set manual shutter speed (see Figure 1). When the manual exposure shooting mode (hereinafter simply referred to as "manual mode"), in which exposure is controlled by operating the camera (not shown), is set to correspond to the "OFF" indicator, the shutter operates at a fixed shutter speed based on the circuit. The off shooting mode (hereinafter simply referred to as off mode) that is used is "AUTO".
When compatible with the index, auto switch SW ₄
is closed, the shutter time is calculated from the photometric luminance value of the subject, and the shutter is operated using this shutter time to control the exposure (hereinafter simply referred to as auto mode).
When the "CHECK" indicator is corresponded to, the battery check switch SW ₅ is closed and the battery check state in which the light-emitting window 23 for battery check display lights up indicates that the power supply voltage Vcc is higher than the specified voltage. It is now possible to obtain each.

FIG. 3 shows the optical system of a single-lens reflex camera disposed within the camera 10 of the present invention.
As is well known, in the optical system of a single-lens reflex camera, a movable reflecting mirror 31 is normally rotatably arranged at an angle of 45 degrees with respect to the photographing optical path. 4
Object light that enters the camera 10 through the mirror is reflected right-angled upward and incident on the viewfinder optical system. The finder optical system includes a focusing glass 35 disposed at a position optically conjugate to the photosensitive surface of the photographic film 34.
A condenser lens 36 is placed directly above the focusing glass 35, and a hentai prism 3 is placed directly above the condenser lens 36.
7, and a finder eyepiece lens 38 disposed to face the rear end surface which is the light output end surface of the pentaprism 37, and the rear end edge between the focusing glass 35 and the condenser lens 36. A photographic information display device 39 made of a light-transmissive liquid crystal display panel, which will be described later, is disposed along the side of the camera. Moreover, the central part of the movable reflection mirror 31 is
Half-mirror processing is applied or fully-transmissive slits are arranged in a row to form a semi-transmissive part 31a, and on the back side of the movable reflective mirror 31 corresponding to this semi-transmissive part 31a, there is a totally-reflective slit. A mirror 32 is movably attached to form a predetermined angle with the movable reflective mirror 31. This total reflection mirror 3
2 serves to reflect the subject light that has passed through the semi-transparent portion 31a of the movable reflection mirror 31 toward a photometric light receiving device 41 disposed at the bottom of the camera 10. The photometric light receiving device 41 is formed in a rectangular shape as shown in FIG. 4, and is attached to the camera body 1.
The photosensitive surface of the photographic film 34 or the surface of the focal plane shutter 33 placed at the rear of the
And looking up at the total reflection mirror 32,
It is tilted toward the front end of the bottom of the camera body 1. This photometric light receiving device 41 has a square shape and a square shape P on the surface of an N-type semiconductor substrate 42.
After forming the type semiconductor regions 43a, 43b, a cathode electrode 44 is formed on the N-type semiconductor substrate 42, and anode electrodes 45a, 45 are formed on the P-type semiconductor regions 43a, 43b.
5b, and the area 43a and the substrate 42 are photovoltaic elements that directly measure the average of the subject light reflected on the photosensitive surface of the photographic film 34 or the surface of the focal plane shutter 33. PD ₁ (see FIG. 8) is formed, and the region 43b and the substrate 42 are connected to the total reflection mirror 3.
A photoelectric conversion element PD 2 (see FIG. 8) is formed for spot-memory photometry of the object light reflected by the photodetector PD ₂ .

FIG. 5 is a block diagram showing an outline of the configuration of the electric circuit in the camera 10 of the present invention. This electric circuit includes a microcomputer (hereinafter abbreviated as CPU) 50 as a central processing unit that controls the entire circuit, and a head amplifier circuit 51 that measures subject light and outputs a photometric integral output S2 and a brightness value signal S6. and outputs the trigger signal S1,
a trigger timing adjustment circuit 52 for controlling the photometry start timing of the head amplifier circuit 51; an analog exposure upper introduction circuit 53 for inputting analog exposure information such as aperture value, film sensitivity value, and correction value to the circuit; and the head amplifier circuit 51. A first comparison circuit 54 compares the photometric integral output S2 from the analog exposure upper introduction circuit 53 and outputs a shutter control signal S17 during direct photometry.
and a shutter control signal S17 during direct photometry from the first comparison circuit 54 and a shutter control signal S16 output from the CPU 50 during memory mode, manual mode, and spot mode. 1 selection circuit 55
, a magnet drive circuit 56 controlled by the shutter control signal output from the first selection circuit 55, a brightness value signal S6 from the head amplifier circuit 51, and an analog exposure information introduction circuit 53.
(film sensitivity value - aperture value) signal (SV -
A second selection circuit 57 that selectively outputs either one of the AV) based on the input selection signal S7 from the CPU 50, and a D-A that converts the 8-bit digital information from the CPU 50. A conversion circuit 58 compares the analog signal output from this DA conversion circuit 58 with the analog signal S8 to be converted from analog to digital output from the second selection circuit 57, and inputs the result to the CPU 50 as digital information. Second
CPU 50 uses the comparison circuit 50 and the manual shutter speed and correction value as digital exposure information.
Digital exposure information introduction circuit 6 for input into
0, the photographing information display device 39 which is driven by receiving the output from the CPU 50, and its main parts. In addition to this, a strobe determination circuit 62 for displaying completion of charging of the strobe;
A battery check circuit 63 that determines whether the power supply voltage Vcc is higher than a specified voltage, a power hold release circuit 64 that releases self-holding of the power supply, and a power supply hold release circuit 64 that determines whether the exposure by strobe light was over or under. A strobe over/under determination circuit 65 and a strobe control circuit 66 for generating an automatic strobe light control signal are each provided. Furthermore, a power supply hold circuit 67 that maintains power supply to the entire circuit, a timer circuit 68 that generates various time signals, and a reference voltage circuit 69 that generates various reference voltages are provided.

FIG. 6 is a block diagram showing the internal configuration of the CPU 50, which is the core of the control system in the camera 10 of the present invention. In the figure, a clock generator (CLOCK) 71 is a part that generates pulses that serve as a reference for the operation of the CPU 50, and a control circuit (CONT) 72 is a part that is a central part that controls the overall operation of the CPU 50. The CPU 50 needs to transfer and process various binary data in an orderly manner according to a predetermined program order. It is also necessary to have a part inside the CPU 50 that determines which flip-flop should be set or reset based on the state of the CPU 50 and the state of the input. CONT does this work
It is 72. The instruction register (INR) 73 is a part that temporarily holds the contents of a random access memory (RAM) 84, which will be described later, and the CONT 72 determines the state of each part of the CPU 50 based on the contents of this INR 73. The program counter (PC) 76 is a part that stores the address to be executed from now on in order to execute the program in the correct order.The program counter (PC) 76 is a part that memorizes the address to be executed from now on in order to execute the program in an orderly manner. . Stack pointer (SP)
77 is executed when an interrupt instruction occurs or a jump instruction to a subroutine occurs.
PC76, Accumulator (ACC)7 described later
9. Index register (IX), which will also be described later, is a register that temporarily holds the contents when you want to return from those instructions and use them again without destroying the contents of the 78 registers. IX7
8 is a register for storing an instruction execution address when the instruction is executed in index address format. The arithmetic processing circuit (ALU) 81 is the part that performs operations related to arithmetic operations during instruction execution, and performs addition, subtraction, and invert instructions to invert memory contents ('1' or '0'). It executes logical operations such as logical sum or logical product of two memories. Condition code register (CCR) 82 is
When executing instructions that require judgment such as branch instructions,
This register is used to store the code used for status detection in a flag. The determination function occupies an important position in the CPU 50, and in controlling the camera 10 of the present invention, the state of each input port ('1' or '0') is determined and the next There are frequently locations where branch instructions are executed, either changing the flow of the program to be executed, or executing instructions without changing the flow. This is done by determining the state of the flag in CCR82. CCR82 is a negative flag that becomes '1' when the result becomes a negative two's complement by executing an instruction, and '0' when the result becomes a positive number, and '1' when the result is '0'. ,'
A zero flag that becomes '0' when the result is not '0', and ' when the result causes a two's complement overflow.
1', an overflow flag that becomes 0 otherwise, a carry flag that becomes 1 when a carry or borrow occurs from an unsigned binary number as a result of an operation, and becomes 0 when no carry occurs. It is composed of various flags. The memory buffer register (MBR) 75 is a register from which, when an address to be read is entered in the storage address register (SAR) 74 and a read instruction is issued to the memory, the contents of the specified address are read out.

Read only memory (ROM) 83 is
This is for causing the CPU 50 to execute instructions while sequentially reading out the contents. Further, a random access memory (RAM) 84 is a memory that temporarily stores values during arithmetic processing, their results, or various input information. A display random access memory (DRAM) 85 is provided for each segment of the liquid crystal display panel forming the photographing information display device 39, which will be described in detail later in the explanation of FIG. 19a.
It has an area corresponding to 1 to 1, and DRAM8
If the content of a certain address of No. 5 becomes '1', the corresponding segment of the liquid crystal display panel will be colored. Liquid crystal drive circuit (LCDD) 61
As mentioned above, is a circuit for driving the photographing information display device 39, which is a liquid crystal display board, to produce color.
In the camera 10 of the present invention, since the 1/3 duty/1/3 bias drive control method of the display device 39 is adopted as described later, the segment line is 39.
Three books and three common lines are drawn out. The input ports (INPP) 88 are 17 input ports I0 to I16, as described later, and the output ports (OUTPP) 89 are 10 input ports, as also described later.
The output ports O0 to O9 are formed respectively (see FIG. 7). Note that all outputs of OUTPP89 are latch outputs.

Next, the flow of control of the CPU 50 configured as above will be briefly explained.

The CPU 50 repeats two cycles: first, a fetch cycle in which the instruction stored in the address in the memory specified by the PC 76 is loaded, and then an execute cycle in which the instruction is executed. And, first, the value of PC76 is
Transferred to SAR74. At the same time, PC76
The contents that were previously stored in the PC 76 plus 1 are stored in . When the address to be read is entered in the SAR 74, a read instruction is issued to the memory, and after a while, the contents of the address specified to the MBR 75 are read out. The unstructured code part is transferred to INR73. This is the fetish cycle. Following this, an execute cycle is entered, but this operation differs depending on the contents of INR73.
As an example, suppose that INR 73 contains an instruction (LDA instruction) to load the contents of memory into ACC 79. The address part of the instruction remaining in the MBR75 is transferred to the SAR74, then a read command is issued to the memory, and after a while the MBR75
The data obtained is transferred to the ACC79 and the command is completed. As another example, we will show how a conditional branch instruction, which frequently appears in the flowcharts described later, is executed. Now, if you want to determine the state of a certain input port (port A) and make a conditional branch, as in the above example, write A to MBR75 in the fetch cycle.
The contents of the port are read. It is assumed that the bit of A port is in the most significant bit of memory.
Now, if INR73 contains an LDA instruction that stores the memory contents in ACC79, the contents of A port will be stored in ACC79 in the same way as in the above example.
will be forwarded to. Subsequently, the PC 76 instructs the address to be executed next, and the instruction is stored in the MBR 75 in exactly the same manner. Now at INR73
Command to shift the most significant bit of ACC79 to the carry flag of CCR82 (ROL command)
If this is the case, the status of the A port ('0' or '1') will be stored in the carry flag in the next execution cycle.
Next, in the same way, determine the state of the carry flag, and if the carry flag is '1', branch, otherwise execute the instruction (BCS instruction) to directly execute the next program. can be accomplished. In the latter example,
Although three instructions, LDA, ROL, and BCS instructions, were used, desired control can be performed by arbitrarily combining dozens of types of instructions in this way.

In addition, in the flowchart described later,
Although it does not show at the machine language level how to specifically use the role blocks shown in Figure 6 to execute the program, transfer commands, additions and subtractions, etc. in the program can be performed using known methods. This can be easily achieved.

FIG. 7 shows the peripheral interface of the CPU 50. In this figure, the symbols I0 to I16 are
The input ports of the CPU 50 and the symbols O0 to O9 indicate the output ports, respectively. The input port I0 is for detecting whether or not the mode is auto mode, and is connected to one end of the auto switch SW ₄ that is linked to the shooting mode switching operation knob 21, and is also connected to a bull-down resistor R ₁ is grounded through. A power supply voltage Vcc is applied to the other end of the auto switch _SW4 . Therefore, input port I0
When auto switch SW ₄ is open, it becomes 'L' level and takes '0', and when it is closed, it becomes 'H'.
The level becomes '1'. When it becomes '1', it indicates that auto mode has been detected. The auto switch _SW4 is also connected to a first input terminal of a NOR circuit _G4 , which will be described later, via a NOT circuit _G1 . In addition, input port I1 is
The operation knob 21 is for detecting whether or not the mode is manual mode, and is for controlling the mode switching operation knob 21.
It is connected to the manual switch _SW3 which is linked to the switch SW3, and is also grounded through the pull-down resistor _R2 . A power supply voltage Vcc is applied to the other end of the manual switch _SW3 . Therefore,
The input port I1 becomes 'L' level and becomes '0' when the manual switch SW ₃ is open, and becomes 'H' level and takes '1' when it is closed.
When it becomes '1', it indicates that manual mode has been detected.

Input port I6 is for detecting whether or not it is in memory mode, and is connected to NAND circuit _G3.
connected to the output end of the The output end of the NAND circuit _G3 is also connected to one input end of the NAND circuit _G5 , and the output end of the NAND circuit _G5 is connected to the NAND circuit _G3.
is connected to the other input terminal of G ₃ ,
_G5 constitutes an RS flip-flop circuit for memory mode detection. One input terminal of the NAND circuit _G3 , which serves as the reset input terminal of this RS flip-flop circuit, is connected to the output terminal of the NAND circuit _G2 , and the NAND circuit _G5 , which serves as the set input terminal, is connected to the output terminal of the NAND circuit G2.
The other input terminal of is connected to the output terminal of NOR circuit _G4 . The output terminal of the NOR circuit _G4 is also connected to the other input terminal of the NAND circuit _G2 . One input end of the NAND circuit _G2 is connected to the memory switch _SW6 that is linked to the memory command operation knob 13, and is also grounded through a resistor _R3 . Memory switch SW ₆ is a self-resetting switch, and the other end is connected to the power supply voltage Vcc.
A strobe power-on signal S14 is applied to the second input terminal of the NOR circuit _G4 , to which the strobe power-on signal S14 is applied, and a memory timer signal T7 is applied to the third input terminal. It is becoming more and more common. Further, the fourth input terminal is connected to one end of a clear switch _SW7 , which will be described later. The NOR circuit _G4 is a reset gate, and when the input port I0 is '0', i.e. not in auto mode, when a strobe is attached to the camera 10 and the strobe is powered on, the memory timer is reset. This gate is used to cancel the memory mode when the clear signal is turned off or when a clear signal is manually input. Further, the NAND circuit _G2 is a gate for resetting the RS flip-flop circuit with the output of the NOR circuit _G4 , giving priority to the memory mode selection signal.

The input port I2 is for detecting whether or not the spot mode is on, and is connected to a NAND circuit _G9.
It is connected to the output terminal of , and becomes ``1'' when the output terminal reaches ``H'' level, indicating that it is in spot mode. The NAND circuit _G9 , together with the NAND circuit _G7 , constitutes an RS flip-flop circuit as in the case of the above-mentioned NAND circuits _G3 and _G5 .
One input terminal of the NAND circuit G ₇ , which serves as the set input terminal of this RS flip-flop circuit for spot mode detection, is connected to the output terminal of the NOR circuit G ₆ , and the other terminal of the NAND circuit G ₉ , which serves as the reset input terminal. The input terminal of is connected to the output terminal of NAND circuit _G8 . Further, the output terminal of the NOR circuit _G6 is also connected to one input terminal of the NAND circuit _G8 .
One input end of the NOR circuit G ₆ is connected to the output port O0 for canceling the spot mode, and the other input end is one end of the self-resetting clear switch SW ₇ that is linked to the memory command operation knob 13. and grounded through resistor _R4 . At the other end of clear switch _SW7 ,
Power supply voltage Vcc is applied. Noah circuit G ₆ is
This is a reset gate and clear switch.
The spot mode is canceled when SW ₇ is pressed or when a pulse signal is output to O0 by software according to the program. In addition, the other input terminal of NAND circuit _G8 is
This NAND circuit _G8 is connected to one end of the spot input switch _SW8 , and serves as a gate for resetting the RS flip-flop circuit with the output of the NOR circuit _G6 , giving priority to the spot input signal.

Input port I3 is for detecting the presence or absence of spot input, and is connected to the output terminal of NAND circuit _G11 , and becomes '1' when the output terminal reaches 'H' level. indicates that there is a spot input. The NAND circuit G ₁₁ , together with the NAND circuit G ₁₂ , as well as the above NAND circuits G ₃ and G ₅ ,
It constitutes an RS flip-flop circuit. One input terminal of the NAND circuit _G11 , which serves as the reset input terminal of this RS flip-flop circuit for spot input detection, is connected to the output terminal of the not circuit _G10 , and the other terminal of the NAND circuit _G12 , which serves as the set input terminal. The input terminal of is connected to the output terminal of the knot circuit _G13 . The input end of the above note circuit _G10 is connected to one end of a self-resetting type spot input switch SW8 via a capacitor _C3 , and is connected to one end of a self-resetting spot input switch _SW8 .
Grounded through _R6 . It is also connected to the collector of the NPN transistor Q ₇₀ ,
The emitter of transistor _Q70 is grounded. Furthermore, the base of the transistor Q ₇₀ is
It is connected to the output port O1 for spot input cancellation through the resistor _R11 , and this output port O1
is also connected to the input terminal of the above-mentioned knot circuit _G13 . Furthermore, as mentioned above, one end of the spot input switch _SW8 is connected to the other input end of the NAND circuit _G8 , and is also grounded through _the resistor _R5 . Power supply voltage Vcc is applied to. The above NAND circuit
The RS flip-flop circuit consisting of G ₁₁ and G ₁₂ is used to hold the signal each time the spot input switch SW ₈ is closed in order to input the spot photometry operation signal multiple times in the spot mode state. It is something. When the spot photometry operation signal is input and the calculation of the shutter time is completed inside the CPU 50, a positive pulse signal is output to the output port O1, the RS flip-flop circuit is set, and the CPU 50 returns to the state of waiting for input of the spot photometry operation signal. becomes.

Input port I4 is for highlight mode detection and is connected to the output terminal of NAND circuit _G15 , and becomes '1' when the output terminal reaches 'H' level.
, indicating that it is in highlight mode.
Further, the self-resetting switch SW ₉ is a command switch for highlight reference shooting, and when the switch SW ₉ is closed, the NAND circuits G ₁₅ and G ₁₆ are activated.
The output of the RS flip-flop circuit becomes 'H' level, and the highlight mode is selected. This highlight mode is canceled by outputting a positive pulse to the output port O2.
On the other hand, the input port I5 is for shadow mode detection, and is connected to the output terminal of the NAND circuit _G19 , and when the output terminal becomes 'H' level, it becomes '1'.
, indicating that it is in shadow mode. In addition, the self-returning switch SW ₁₀ is a command switch for shadow reference photography.
When SW ₁₀ is closed, the output of the RS flip-flop circuit consisting of NAND circuits G ₁₉ and G ₂₁ becomes 'H' level, and the shadow mode is selected. This shadow mode is canceled by outputting a positive pulse to the output port O3. In addition, switch SW ₉ , resistor R ₇ , R ₈ , R ₁₂ , capacitor
C ₄ , NPN transistor Q ₇₁ , knot circuit
A highlight mode detection circuit consisting of _G14 , _G17 and NAND circuits _G15 , _G16 , and a switch _SW10 ,
The connection mode of the shadow mode detection circuit consisting of resistors R ₉ , R ₁₀ , R ₁₃ , capacitor C ₅ , NPN type transistor Q ₇₂ , Not circuits G ₁₈ , G ₂₀ and NAND circuits G ₁₉ , G ₂₁ is the above-mentioned switch SW ₈ , Resistance _R5 ,
R ₆ , R ₁₁ , capacitor C ₃ , NPN transistor Q ₇₀ , nott circuit G ₁₀ , G ₁₃ and NAND circuit
Since the configuration is almost the same as the spot photometry operation signal input detection circuit consisting of G ₁₁ and G ₁₂ , detailed explanation thereof will be omitted.

Next, the operations of the spot photometry operation signal input detection circuit, highlight mode detection circuit, and shadow mode detection circuit will be explained by taking the spot photometry operation signal input detection circuit as an example. First, when spot input switch _SW8 is closed, the capacitor
A short pulse signal of 'H' level is generated at the input terminal of the knot circuit _G10 via _C3 . Then, the output terminal of the RS flip-flop circuit consisting of NAND circuits G ₁₁ and G ₁₂ becomes 'H' level, the input port I3 becomes '1', the CPU 50 detects that the spot photometry operation has been performed, and the required time After t has elapsed, a pulse-like reset signal of ``H'' level is output to the output port O1 to reset the RS flip-flop circuit. Here, if capacitor C ₃ and resistor R ₆
If the time constant of is longer than the predetermined time t, even if the reset signal is output, the RS flip-flop circuit will return to the set state, and the CPU 50 may misunderstand that the spot photometry operation signal has been input again. . For this reason, a transistor _Q70 is connected in parallel with the resistor _R6 , and the reset signal turns on the transistor _Q70 , forcing the capacitor _C3 to fully charge.

The output port O4 is a port that outputs the photometry mode command signal S3, and when the signal S3 is '1', the average photometry mode is selected in the head amplifier circuit 51 (see Fig. 8), which will be described later, and the signal is '0'. , the spot metering mode is selected. Further, the output port O5 is a port that outputs the input selection signal S7, and when the signal S7 is '1', the second selection circuit 57, which will be described later,
(see Fig. 9), the brightness value signal S6 is
It is output as the D-converted analog signal S8, and when it is '0', the analog calculation value signal (SV-AV) of the film sensitivity value and aperture value is outputted as the A-D converted analog signal S8. There is. Output port O6 is connected to the above D-A converter circuit (DAC) 5.
This is an output port for determining the sign of each bit of 8, and is composed of 8 bits in parallel. input port
I7 is a port for inputting A-D converted digital information, and is a port for inputting the A-D converted digital information to the above-mentioned D-A conversion circuit 58.
In addition, a comparator A ₁₂ serves as a second comparison circuit 59 forming a successive approximation type A-D conversion circuit.
connected to the output end of the This comparator
The inverting input terminal of _A12 is connected to the output terminal of the DA conversion circuit 58, and the non-inverting input terminal is applied with the analog signal S8 to be A/D converted.

The output port O7 serves as a common output terminal of the liquid crystal drive circuit 61, is formed by three lines, and is connected to a liquid crystal display (LCD) of the photographing information display device 39. Also, output port O8
serves as a segment output end of the liquid crystal drive circuit 61, is formed by 39 lines, and is connected to a liquid crystal display (LCD) of the photographing information display device 39. Input port I8 is a port for inputting the manual shutter seconds, and consists of four input lines. Further, the input port I9 is a port for inputting a correction value, and consists of four input lines. Both input ports I8 and I9 are connected to the digital exposure information introducing circuit 60. The input port I10 is an input port for detecting a release signal, and a release signal S0 is applied thereto. Further, the input port I11 is an input port for detecting a trigger signal, and an inverted signal of the trigger signal S1 is applied through the knot circuit _G100 . Furthermore, input port I12 is
This is an input port for detecting an exposure end signal, and an exposure end signal S13 is applied thereto. Furthermore, input port I13 is an input port for detecting the strobe power on signal.
S14 is now applied. input port
I14 is a strobe photography over signal detection input port for detecting whether overexposure occurred during strobe photography, and a strobe photography over signal S9 is applied thereto. Further, the input port I15 is an input port for detecting a strobe photography under signal for detecting whether or not exposure was underexposed in strobe photography, and a strobe photography under signal S10 is applied thereto. Output port O9 is in memory mode,
This port is for outputting the shutter control signal S16 in manual mode and spot mode.
In addition, input port I16 is connected approximately 2 times after the strobe fires when the exposure is appropriate during strobe photography.
This is a port for inputting a strobe light emission appropriate signal S20 for proper display for a period of seconds.

FIG. 8 shows a detailed electrical circuit of the head amplifier circuit 51. This head amplifier circuit 5
1 basically consists of a circuit for generating brightness information in open average photometry and brightness information in open spot photometry, an integrating circuit for direct photometry, and an analog switch. operational amplifier
_A1 is an operational amplifier with bipolar transistor input, the reference voltage _V0 is applied to the non-inverting input terminal, and the inverting input terminal is connected to the output terminal of operational amplifier _A2 . This operational amplifier _A1 can reduce the input offset voltage to 1mV without offset adjustment.
It can be kept within. The output terminal of operational amplifier A ₁ is connected to the emitter of PNP type transistor Q ₁ , and the collector of transistor Q ₁ is connected to the output terminal of operational amplifier A ₂ through resistor R ₁₆ .
Connected to the collector and base of Q ₂ .
The logarithmic compression transistor Q ₂ is a multi-emitter PNP transistor, with one emitter serving as the anode of the photovoltaic element PD ₁ for average photometry, and the other emitter serving as the photovoltaic element for spot photometry.
Each is connected to the anode of PD ₂ . The base and collector of transistor Q ₂ are also connected to the non-inverting input of operational amplifier A ₃ .
The cathodes of the photovoltaic elements PD ₁ and PD ₂ are connected to the inverting input terminal of the operational amplifier A ₂ , and the anodes are
It is connected to one non-inverting input terminal and the other non-inverting input terminal of operational amplifier _A2 , respectively. Operational amplifier _A2 is a MOS type transistor input operational amplifier and has two non-inverting input terminals, and the photometry mode command signal S3 applied to the control signal input terminal.
The valid non-inverting input terminal is switched depending on whether the signal is 'H' level or 'L' level. That is, when the photometry mode command signal S3 is at the 'H' level, the other non-inverting input terminal becomes valid, the anode and cathode of the photovoltaic element _PD1 is maintained at zero bias, and _the base and
The potential between the collectors changes depending on the amount of light received by the photovoltaic element _PD1 . Furthermore, when the photometry mode command signal S3 is at the 'L' level, one non-inverting input terminal is enabled, the anode and cathode of the photovoltaic element PD ₂ are maintained at zero bias, and the base and cathode of the transistor _Q2 are The potential between the collectors changes depending on the amount of light received by the photovoltaic element PD ₂ . Note that the bias switching signal S4 is connected to the bias switching signal input terminal of the operational amplifier _A2 through the resistor _R17 .
is applied, and when this signal S4 becomes 'H' level during direct photometry, the bias current of operational amplifier _A2 increases and the operational amplifier
_A2 can operate at high speed, and when the signal S4 goes to the 'L' level during storage photometry, the bias current of the operational amplifier _A2 is reduced, reducing power consumption.

The capacitors C ₁ and C ₂ are integrating capacitors during direct photometry, and one ends of both capacitors C ₁ and C ₂ are respectively connected to the anode of the photovoltaic element receiver PD ₁ for average photometry. Also, the other end of capacitor C ₁ is grounded and capacitor C ₂
The other end is connected to the collector of NPN transistor _Q6 . The transistor _Q6 is a transistor for switching the integral capacitance, and has an emitter that is grounded, and a base that receives the integral capacitance switching signal S5 through a resistor _R19 . Also, the collector of transistor Q ₆ is
It is also connected to the output of operational amplifier A ₂ through resistor R ₁₈ . The integral capacitance switching signal S5 is a signal that is switched depending on the film sensitivity, and is output from the output terminal Q of the latch circuit DF0 (see FIG. 9). Direct photometry is the photometric integral output of the integrating circuit.
Exposure is terminated when S2 (output of operational amplifier _A2 ) reaches a predetermined voltage level depending on the film sensitivity, but the judgment voltage is on the order of several mV when the film sensitivity is high, and static electricity It becomes more susceptible to the effects of noise such as Therefore, in this circuit, when the film sensitivity is high, the integral capacitance switching signal S5 is set to 'L' level and the transistor is switched off.
By turning off Q ₆ and reducing the capacity of the integrating capacitor to only capacitor C ₁ , the judgment level of the integrated voltage is conversely raised.
Also, when the film sensitivity is low, the integral capacitor switching signal S5 is set to 'H' level, transistor _Q6 is turned on, and the capacitance of the integral capacitor is changed to the capacitor.
By using parallel capacitances of C ₁ and C ₂ , the integrated voltage judgment level is lowered and the dynamic range is expanded. Resist the collector of transistor Q ₆
The reason why it is connected to the output terminal of operational amplifier A ₂ through R ₁₈ is to make the capacitance of capacitor C ₂ substantially zero when transistor Q ₆ is off.

The operational amplifier _A3 is a buffer operational amplifier, and its output terminal is connected to the inverting input terminal of the amplifier _A3 , and is also connected to the collector of a PNP transistor _Q7 . The base of the transistor Q ₇ is connected to the non-inverting input terminal of the operational amplifier A ₃ , and the emitter is connected to one non-inverting input terminal of the operational amplifier A ₀ (see FIG. 9) forming the second selection circuit 57. and is connected to one end of the constant current circuit _CC1 . constant current circuit
A power supply voltage Vcc is applied to the other end of CC ₁ , and a constant current I ₀ flows through the current circuit CC ₁ . A voltage proportional to the absolute temperature of the logarithmic compression value of the photocurrent generated in the photovoltaic element PD ₁ or PD ₂ appears at the emitter of the transistor Q ₇ , and this voltage is derived as the brightness value signal S6. It's summery.

The base of the transistor _Q1 is connected to the collector of the NPN transistor _Q5 .
The power supply voltage Vcc is applied to the base of the transistor _Q5 through the resistor _R14 , and the emitter of the transistor _Q5 is grounded. In addition, between the base and emitter of transistor _Q5 is a diode-connected NPN transistor _Q4 ,
NPN transistor Q ₃ is connected to each. The base of the transistor Q ₃ is connected through a resistor R ₁₅ to the output terminal of the knot circuit G ₁₀₁ (see Figure 12), from which _a trigger signal is received.
It is designed to receive the voltage S1.

Next, the operation of the head amplifier circuit 51 configured as described above will be briefly described. Now, if the trigger signal S1 is at the 'L' level, the transistor _Q3 is turned off, the transistor _Q5 is turned on, and the transistor _Q1 is turned on. With this, the output of operational amplifier A ₁ is connected to transistor Q ₁ ,
It is now fed back to the inverting input of op amp A ₁ via Q ₂ and op amp A ₂ ,
A negative feedback circuit is formed. Therefore, the op amp
The output voltage of A ₂ will be equal to the reference voltage V ₀ . Here, a voltage is generated at the emitter of the transistor _Q7 in accordance with the amount of light received by the photovoltaic element _PD1 or _PD2 . During direct metering, the trigger signal S1 changes to 'H' level as soon as exposure starts.
Transistor Q ₃ is turned on, transistor Q ₅ is turned off, transistor Q ₁ is turned off, the negative feedback circuit mainly formed by operational amplifiers A ₁ and A ₂ is cut off, and the base-collector potential of transistor Q ₂ is It has the same potential as the output of operational amplifier _A2 .
Therefore, the capacitors C ₁ and C ₂ start charging in accordance with the photocurrent generated in the photovoltaic element PD ₁ . At this time, the emitter of transistor _Q2
The voltage across the base is only the offset voltage of op amp A ₂ , and the voltage across the base of transistor Q ₂ is
Leakage current between emitters and between emitters and collectors is extremely small. Also, op amp A ₂ is
Since it is a MOS type transistor input operational amplifier, the charging current of capacitors C ₁ and C ₂ is almost entirely due to photocurrent, making it possible to create long exposure seconds with high precision. Then, the capacitors C ₁ and C ₂ continue to charge, and the integral output S2 of direct photometry is output to the output terminal of the operational amplifier A ₂ . If the voltage of this integral output S2 is not higher than the collector potential of the transistor Q ₂₀ (see FIG. 9), the output of the operational amplifier A ₈ (see FIG. 10) is inverted and the exposure is completed.

FIG. 9 shows the analog exposure information introducing circuit 53.
and a detailed electrical circuit diagram of the second selection circuit 5. A reference voltage V ₀ is applied to the non-inverting input terminal of the operational amplifier A ₄ , and a voltage proportional to the absolute temperature is applied to the inverting input terminal of the operational amplifier A ₄ by a constant current circuit CC ₂ through a variable resistor RV ₀ for inputting a correction value. A current I ₁ is flowing. Between the output terminal and the inverting input terminal of operational amplifier A ₄ , there are a variable resistor RV ₁ for film sensitivity input, a semi-fixed resistor RV ₂ for adjusting the exposure level of direct metering, and a semi-fixed resistor for adjusting the display level.
A series circuit of RV ₃ and variable resistor RV ₄ for inputting aperture information is connected. For this reason, op amp A ₄
A voltage corresponding to the analog calculation value (SV-AV) of the difference between the film sensitivity value Sv and the aperture value Av appears at the output _terminal of It is applied to the inverting input terminal. The brightness value signal S6 is applied to one non-inverting input terminal of the operational amplifier _A9 from the emitter of the transistor _Q7 (see FIG. 8). The output terminal of the operational amplifier A ₉ is connected to the inverting input terminal of the amplifier A ₉ and also to the non-inverting input terminal of the comparator A ₁₂ (see FIG. 7). In addition, the input selection signal S7 is applied to the control signal input terminal of the operational amplifier _A9 from the output port O5 (see Figure 7).
When S7 is at 'H' level, one non-inverting input terminal becomes valid, and the brightness value signal S6 is output as a non-A-D converted analog signal S8 to the output terminal of operational amplifier _A9 , and the same signal S7 When is 'L' level, the other non-inverting input terminal becomes valid and the operational amplifier
A voltage corresponding to the calculated value (SV-AV) is outputted to the output terminal of _A9 as an analog signal S8 to be A/D converted.

Operational amplifier A ₅ and the transistor group after it generate a judgment voltage for the integration circuit output S2 during direct photometry, and generate a signal to switch the capacitance of integration capacitors C ₁ and C ₂ according to the film sensitivity. It is set up for the purpose of
The non-inverting input terminal of the operational amplifier _A5 is connected to the connection point between the resistors _R30 and _R31 , where the reference voltage _V0 is divided by the resistors _R30 and _R31 . Also,
A reference voltage V ₀ is applied to the inverting input terminal of the operational amplifier A ₅ through a resistor R ₃₂ . Op amp A ₅
An NPN type transistor Q ₁₀ is inserted between the output terminal and the inverting input terminal of the transistor Q ₁₀ , with the emitter connected to the output terminal and the collector connected to the non-inverting input terminal. , is connected to the connection point between the correction value input variable resistor RV ₀ and the constant current circuit CC ₂ . Also, the output end of operational amplifier _A5 is
It is also connected to the emitter of NPN transistor Q ₁₁ , and the base of this transistor Q ₁₁ is
Connected to the connection point of semi-fixed resistors RV ₂ and RV ₃ . And the collector of transistor Q ₁₁ is
Collector and PNP of PNP type transistor Q ₁₃
Each is connected to the base of a type transistor _Q12 . Transistor Q ₁₃ has the power supply voltage Vcc applied to its emitter, and its base is connected to the base of PNP transistor Q ₁₄ and also to the emitter of transistor Q ₁₂ . The collector of transistor _Q12 is grounded. Transistor _Q14 has the power supply voltage Vcc applied to its emitter, and its collector
Connected to the collector and base of the NPN transistor _Q22 . Above transistor Q ₁₃ and
_Q14 constitutes a current mirror circuit that allows a current equal to the current flowing through the collector of the transistor _Q11 to flow through the collector of the transistor _Q22 . Transistor Q ₂₂ has its emitter grounded and its base connected to NPN transistor Q _81.
and the base of each of the n NPN transistors _Q80 . The emitter of each transistor in transistor group Q ₈₀ is grounded, and the collector is a PNP type transistor.
It is connected to the collector of Q ₁₅ and to the base of PNP transistor Q ₁₆ . The transistor Q ₂₂ and each transistor in the transistor group Q ₈₀ constitute a current mirror circuit, and a current n times the current flowing through the collector of the transistor Q ₂₂ flows through the collector of the transistor Q ₁₅ . ing. The emitter of the transistor _Q81 is grounded, and the base is connected to the output terminal Q of the latch circuit _DF0 through a resistor _R33 . When the integral capacitance switching signal S5 output from the latch circuit _DF0 is at the 'H' level, the transistor _Q81 is turned on and the transistor Q81 is turned on.
Q ₂₂ and the transistor group Q ₈₀ are turned off, and the collector current of the transistor Q ₁₅ becomes zero.

Transistor Q ₁₅ has the supply voltage on its emitter
Vcc is applied to it, and its bases are connected to the bases of PNP transistors Q ₁₇ and Q ₁₈ , respectively, and also connected to the emitter of PNP transistor Q ₁₆ . The collector of transistor _Q16 is grounded. transistor Q ₁₇
has the power supply voltage Vcc applied to its emitter, and its collector connected to the collector of the PNP transistor Q ₂₀ and to the non-inverting input terminal of the comparator A ₈ (see FIG. 10). In addition, the emitter of the transistor _Q18 is applied with the power supply voltage Vcc, and the collector is connected to the PNP type transistor _Q19.
is connected to the collector of
A ₇ (see Figure 10) is connected to the non-inverting input terminal. Transistor Q ₁₅ and transistor Q ₁₇
and _Q18 form a current mirror circuit, and the same current as the collector current of transistor _Q15 flows through the collectors of transistors _Q17 and _Q18 . Above transistor Q ₁₉ and
Q ₂₀ has the supply voltage Vcc applied to its collector, and the reference voltage V ₀ applied to the collector through resistors R ₃₄ and R ₃₅ .
is applied. And transistor Q ₁₉
and Q ₂₀ have their bases connected to the base of transistor Q ₁₃ , respectively, and
_Q13 and each form a current mirror circuit. Therefore, the same current flows through the collectors of transistors Q ₁₉ and Q ₂₀ as the collector current of transistor Q ₁₃ . The base of the above transistor Q ₁₃ is also connected to the base of the PNP type transistor Q ₂₁ , and the transistor Q ₂₁
receives the power supply voltage Vcc at its emitter, and its collector is grounded through a semi-fixed resistor _RV5 for adjusting the switching point of the capacitance of the integrating capacitors _C1 and _C2 . The collector of transistor Q ₂₁ is connected to the non-inverting input terminal of comparator A ₆ . The inverting input terminal of comparator A ₆ is connected to the connection point between resistors R ₃₆ and R ₃₇ that divide the reference voltage V ₀ , and the output terminal is connected to a latch circuit.
Connected to input terminal D of DF ₀ . This comparator _A6 serves to determine whether or not to switch the integral capacity depending on the film sensitivity. The release signal S0 is applied to the control signal input terminal of the latch circuit DF ₀ from the collector of the transistor Q ₃₂ (see Fig. 11), and the latch circuit DF ₀ outputs an output when the shutter is released. It serves to keep the integral capacitor switching signal S5 output from the terminal Q from being inverted. In addition, the above resistance
The resistance value of R ₃₄ is set to √2 times the resistance value of the resistor R ₃₅ .

Next, the operation of the analog exposure information introduction circuit 53 configured as described above will be briefly described. The output terminal of operational amplifier A ₄ has a reference voltage V ₀ as a reference.
A voltage is generated by adding a voltage drop equal to the product of the series resistance values of the resistors RV ₁ to _{RV 4} multiplied by a constant current I ₁ proportional to the absolute temperature. The voltage corresponding to a change in aperture or film sensitivity per step is about 18 mV at constant temperature. Therefore, the output of the operational amplifier _A4 is not affected by the voltage drop caused by the correction value input variable resistor _RV0 . The base potential of the transistor Q ₁₀ is lower than the reference potential V ₀ by the voltage drop across the resistor RV ₀ . On the other hand, the base potential of transistor Q ₁₁ is
Variable resistor for film sensitivity input from reference voltage V ₀
The voltage becomes higher by the voltage drop of the series resistance of RV ₁ and the exposure level adjustment semi-fixed resistor RV ₂ , and the voltage between the bases of transistors Q ₁₀ and Q ₁₁ becomes a value corresponding to the film sensitivity and the correction value. Now, if the collector current of the transistor Q ₁₁ is Ic, then when the transistor Q ₈₁ is on, the currents flowing through the resistors R ₃₄ and R ₃₅ are both (1+n)Ic. Here, when the variable resistor RV ₁ for film sensitivity input is a low value, that is, when a high sensitivity film is used,
The collector current Ic of the transistor Q ₁₁ becomes lower, and therefore the collector potential of the transistor Q ₂₁ , which is the value of (resistance value of the variable resistor RV ₅ ) × (collector current Ic of the transistor Q ₂₁ ), becomes lower and the comparator A The output of ₆ becomes 'L' level. Therefore, transistor Q ₈₁ is turned off and resistor R ₃₄ ,
The voltage drop across R ₃₅ will be large. Therefore, the voltage applied to the reversing force terminals of comparators A ₇ and A ₈ increases. This means that the judgment voltage level of the integrating circuit during direct photometry has increased and the judgment voltage range has expanded. Even if the width of the judgment voltage is widened, the capacity of the integrating capacitor becomes that of only one capacitor _C1 , so correct exposure can be obtained. The film sensitivity level at which the switching is to be performed is set in advance by adjusting the semi-fixed resistor _RV5 . By the way, the potential difference between the two input terminals of comparator _A6 is small,
If the output of comparator A ₆ becomes unstable due to noise etc. during exposure, it will cause an error in exposure.
After the shutter release operation, the release signal S0 becomes 'H' level and latches the output of the latch circuit _DF0 .

FIG. 10 shows detailed electric circuits of the strobe over/under determination circuit 65 and the first comparison circuit 54. The strobe over/under determination circuit 65 is a part that determines whether the exposure level is over or under when performing strobe photography using direct metering. The inverting inputs of comparators A ₇ and A ₈ are
As mentioned earlier, transistors Q ₁₈ and Q ₁₇
(see FIG. 9), and the integral output S2 of direct photometry from the output end of the operational amplifier _A2 (see FIG. 8) is applied to the non-inverting input terminal. The output terminal of the comparator A ₇ is connected to the first input terminal of the three-input NAND circuit G ₂₂ , and the output terminal of the comparator A ₈ is connected to the second input terminal of the NAND circuit G ₂₂ , a D-type flip-flop. It is connected to the input terminal D of the circuit DF ₁ and to the input terminal of the knot circuit G ₂₈ , respectively. The comparator _A8 is a comparator for exposure control during direct metering, and compares the integral output S2 from the head amplifier circuit 51 with the output from the analog exposure information introducing circuit 53.
A first comparison circuit 54 is formed to determine the exposure level during direct photometry. Further, the comparator _A7 is also a comparator for determining the integral output S2, but the determination level of this comparator _A7 is set to √2 times the determination level of the comparator _A8 . That is, since the ratio of the resistance values of the resistors R ₃₄ and R ₃₅ is set to √2 times, the potential at the inverting input terminal of comparator A ₇ is √2 times that of comparator A ₈ . ing. The D-type flip-flop circuit _DF1 has a clock pulse CK applied to its clock input terminal, and its inverted output terminal is connected to the third input terminal of the NAND circuit _G22 . The output end of the NAND circuit _G22 is connected to one input end of the NAND circuit _G23 , which is the reset input end of the RS flip-flop circuit formed by the NAND circuits _G23 and _G24 . Also, the NAND circuit which is the set input terminal of the RS flip-flop circuit
The other input of G ₂₄ is an RS flip-flop circuit.
The strobe charging gate signal T4 is applied from the inverted output terminal of _RSF4 (see FIG. 16). Then, from the output terminal of the NAND circuit G ₂₃ , which is the output terminal of the RS flip-flop circuit, if there is overexposure when flash photography is performed using direct metering, an 'H' level flash photography over signal S9 is sent to the strobe charging gate signal. T4 is 'H'
The signal is output to the input port I14 of the CPU 50 only during the level. Further, the output terminal of the NAND circuit _G24 , which is the inverting output terminal of the RS flip-flop circuit, is connected to the first input terminal of the three-input AND circuit _G98 . On the other hand, the shutter control signal S17 during direct photometry is outputted from the output terminal of the note circuit _G28 to the first selection circuit 55 (see FIG. 15), and this signal S17 is It is also input to the other input terminal of the NAND circuit _G27 . A strobe underlimit signal T6 is applied to one input terminal of the NAND circuit _G27 from the inverted output terminal of the RS flip-flop circuit _RSF6 (see FIG. 16). and,
The output terminal of NAND circuit G ₂₇ is NAND circuit G ₂₅ , G ₂₆
It is connected to the other input terminal of the NAND circuit _G26 , which is the reset input terminal of the RS flip-flop circuit formed by the RS flip-flop circuit. In addition, one input terminal of the NAND circuit _G25 , which is the set input terminal of the RS flip-flop circuit, is connected to the strobe charging gate signal T4.
is being applied. From the output terminal of the NAND circuit _G26 , which is the output terminal of the RS flip-flop circuit, if the exposure is underexposed during flash photography using direct metering, the 'H' level flash photography under signal S10 is sent to the strobe charging gate signal T4. The signal is input to the input port I15 of the CPU 50 only while the signal is at 'H' level.
In addition, the output terminal of the NAND circuit _G25 , which is the inverting output terminal of the RS flip-flop circuit, is connected to the AND circuit described above.
Connected to the third input of _G98 . The strobe charge gate signal T4 is applied to the second input terminal of the AND circuit G ₉₈ , and the output terminal of the AND circuit G ₉₈ is connected to the input port I16. Only then, a strobe light emission appropriate signal S20 which is at 'H' level for about 2 seconds is output. In addition, the above strobe charge gate signal
As shown in FIG. 18g, T4 is '
This is a signal that changes to H' level and remains at 'H' level for 2 seconds. In addition, as shown in Fig. 18h, the strobe under limiter signal T6 is output for 22 ms after the trigger signal S1 is inverted to 'H' level.
This is a signal that changes to 'H' level after a certain period of time. Further, the clock pulse CK is a rectangular wave signal that repeats 'H' level and 'L' level at 32.768 KHz, as shown in FIG. 18a.

Next, the operation of the strobe over/under determination circuit 65 configured as described above will be briefly described. Immediately after the shutter release, the integral output S2 is small, so the output of comparator _A8 is at the 'L' level. Therefore, at this point, the output of the inverting output terminal of the D-type flip-flop circuit _DF1 and the output of the NOT circuit _G29 are at the ``H'' level. However, the second input terminal of NAND circuit G ₂₂ and one input terminal of NAND circuit G ₂₇ are at 'L' level, and the outputs of NAND circuits G ₂₂ and G ₂₇ are at 'H' level. It's summery. Furthermore, as can be seen from FIG. 18g, the strobe charge gate signal T4 is at the 'L' level immediately after the release, so the strobe photography over signal S9 and the strobe photography under signal S10, which are the outputs of the RS flip-flop circuit, are 'L'. 'The level has been reset. Assume now that the shooting mode of the camera 10 is the direct photometry shooting mode. When the trigger switch _SW2 shown in FIG. 12 is opened, the potential of the integral output S2 of the head amplifier circuit 51 shown in FIG. 8 gradually rises. When the shutter is fully opened and the strobe trigger thyristor SCR ₁ , which serves as the X contact shown in FIG. 15, is turned on, the strobe flashes. When the potential of the integral output S2 becomes higher than the potential of the non-inverting input terminal of the comparator _A8 , the output of the comparator _A8 is inverted to 'H' level, and at the same time, the output of the inverting output terminal of the D-type flip-flop circuit _DF1 turns to 'L' level with a delay of one pulse of clock pulse CK. As a result, the Nando circuit G ₂₂
The inverted output of the output of comparator A ₇ is output to the output terminal of , for one period of the clock pulse CK after the output of comparator A ₈ changes to the 'H' level. Here, as mentioned above,
Since the judgment level of comparator A ₇ is set to √2 times the judgment level of comparator A ₈ , the output of comparator A ₈ , which becomes shutter control signal S17 through knot circuit G ₂₈ , goes to 'H' level. If the exposure is 0.5Ev or more within 100μs, which is one cycle of the clock pulse CK, the output of comparator A ₇ becomes 'H' level, and therefore the output of NAND circuit G ₂₂ becomes 'L' level. Therefore, the strobe photography over signal S9, which is the output of the RS flip-flop circuit, is set to the 'H' level, and an overexposure warning is displayed as described later.

On the other hand, when the output of comparator _A8 remains at 'L' level even after 6ms after the strobe fires,
That is, when the exposure level is still under, the strobe under-limit signal T6 changes to 'H' level, so the output of NAND circuit _G27 is inverted to 'L' level, and the strobe photography, which is the output of the RS flip-flop circuit, is switched to 'L' level. The underexposure signal S10 is set to 'H' level, and an underexposure warning is displayed as described later. Since it takes approximately 6 ms from the time when the shutter control signal S17 is generated until the shutter trailing curtain moves within the photographic image frame, the determination of underexposure is also delayed until then.

Note that overexposure and underexposure warnings are displayed only when flash photography is performed using direct metering, depending on the photography mode determined by the CPU 50. In addition, the overexposure and underexposure warning display is caused by the RS flip-flop circuit consisting of NAND circuits G ₂₃ and G ₂₄ and the NAND circuit, since the strobe charge gate signal T4 changes to 'L' level 2 seconds after the strobe fires. The RS flip-flop circuits consisting of G ₂₅ and G ₂₆ are each reset, and the strobe photography over signal S9 and the strobe photography under signal S10 are each inverted to the 'L' level, so that they are stopped.

Also, after the strobe fires, if there is no overexposure or underexposure, the AND circuit G ₉₈
Since the first and third input terminals of the are at 'H' level, the strobe charge gate signal T4 is 'H'.
During the 2 seconds at the level, the output terminal of the AND circuit _G98 outputs the strobe light emission appropriate signal S20 at the 'H' level.
is output. As a result, the program of the CPU 50 causes a display of appropriate exposure to be displayed for two seconds during strobe photography using direct photometry.

FIG. 11 shows a detailed electric circuit of the power supply hold circuit 67. This power hold circuit 67 is a circuit that supplies power to the magnet drive circuit 56 and flash control circuit 66 after the shutter release, and automatically cuts off the power after exposure is completed. From the positive pole of the power supply battery E ₁ there is an operating voltage supply line L ₁ , and from the negative pole there is a common earth line L ₀
are pulled out, and the ground line L ₀
is grounded. Between both lines L ₁ and L ₀ is a battery check switch SW ₅ and a resistor.
A series circuit of R ₃₈ and R ₃₉ is connected. The battery check switch SW ₅ is a self-resetting switch that is closed in conjunction with the operation of the mode switching operation knob 21 corresponding to the "CHECK" indicator, and the switch SW ₅ and the resistor R ₃₈ are connected to each other. The connection point is connected to one input end of an AND circuit G ₃₈ (see FIG. 13). Also, the above resistor R ₃₈ and
The connection point with R ₃₉ is connected to the base of NPN transistor Q ₂₃ . The collector of transistor Q ₂₃ is connected to transistor Q ₃₄ through resistor R ₄₀
The emitter is connected to the base of , and the emitter is grounded. Also, the base of transistor Q ₂₃ is
It is connected to the collector of an NPN transistor Q ₂₄ , the emitter of which is grounded, and its _base connected to the collector of a PNP transistor Q ₂₅ through a resistor R ₄₁ . Transistor Q ₂₅ has its emitter connected to line L ₁ and its base connected to PNP transistors Q ₂₈ , Q ₂₉ ,
It is connected to the bases of Q ₃₀ , Q ₃₁ , Q ₃₂ and Q ₃₃ respectively, and each transistor Q ₂₅ , Q ₂₉ ,
Q ₃₀ , Q ₃₁ , Q ₃₂ and Q ₃₃ have their emitters connected to line L ₁ respectively, and transistor Q ₂₈
and constitutes a current mirror circuit.

Further, a series circuit including a release switch SW ₁ , a capacitor C ₆ , and resistors R ₄₄ and R ₄₃ is connected between the lines L ₁ and L ₀ . The release switch _SW1 is a switch that opens and closes in conjunction with the movable reflective mirror 31, and is closed when the mirror 31 is at the beginning of its ascent and opened at the end of its descent. The connection point between release switch _SW1 and capacitor _C6 is grounded through resistor _R42 . Also,
The connection point between resistors R ₄₄ and R ₄₃ is connected to the base of NPN transistor Q ₂₆ , whose emitter is grounded and whose collector is grounded _.
Connected to the emitter of NPN transistor _Q27 . Transistor Q ₂₇ has a resistor at its base
Transistor Q ₃₉ through R ₉₉ (see Figure 12)
is connected to the emitter, and the collector is NPN
connected to the collector of type transistor _Q35 . Transistor Q ₃₅ has a collector with resistor R ₄₅
It is also connected to the collector and base of the transistor _Q28 through the transistor Q28, the emitter is grounded, and the base is connected through the resistor _R46 to the connection point between the resistors _R48 and _R47 . One end of the resistor _R48 is connected to the collector of the transistor _Q29 , and the other end of the resistor _R47 is grounded. Also, the resistance R ₄₈
The connection point between and R ₄₇ is an NPN transistor Q ₃₆
The emitter of the same transistor Q ₃₆ is grounded, and the base is connected to the resistor R _59.
(see Figure 13), the NAND circuit G ₃₃ (first
(see Figure 3). The collector of the above transistor Q ₃₀ is connected through the resistor R ₄₉ to
It is connected to the base of transistor Q ₄₆ (see Figure 12). Also, the above transistor Q ₃₁
The collector of is grounded through a resistor R ₅₀ and also connected to the input terminal of a knot circuit G ₁₀₂ (see FIG. 13). Furthermore, the collector of the transistor Q ₃₂ is grounded through the resistor R ₅₁ and connected to the control signal input terminal of the latch circuit DF ₀ (see FIG. 9), so that the collector voltage of the transistor Q ₃₂ is Release signal S0
It is now being supplied as a Furthermore, the collector of the above transistor _Q33 is PNP
It is connected to the collector of type transistor Q ₃₄ and to the base of NPN type transistor Q ₃₇ through resistor R ₅₂ . The emitter of the transistor _Q37 is grounded, and the collector is connected to one end of the magnet drive circuit 56 and one end of the strobe control circuit 66, respectively. The other ends of the magnet drive circuit 56 and the strobe control circuit 66 are respectively connected to the line _L1 . Therefore, transistor _Q37 serves as a switching transistor that controls the power supply to magnet drive circuit 56 and strobe control circuit 66. In addition, the collector of the transistor Q ₃₇ is connected to the cathode of the light emitting diode D ₀ (see FIG. 13) for battery check indication and the resistor R ₅₈ (see FIG. 13).
(see figure) are also connected to one end of each. The above transistor _Q34 connects the emitter to line _L1
, connect the base to the transistor through the resistor R ₄₀
It is connected to the collector of Q ₂₃ and is forcibly turned on during the battery check operation so that the battery check is performed in the state of maximum current consumption that supplies power to the magnet drive circuit 56 and strobe control circuit 66. belongs to.

FIG. 12 shows a detailed electrical circuit of the trigger timing adjustment circuit 52. This trigger timing adjustment circuit 52 is a circuit for adjusting the photometry start timing in the head amplifier circuit 51. Trigger switch SW ₂ is a switch that opens in conjunction with the start of travel of the shutter front curtain and closes in conjunction with the completion of film winding. One end receives power supply voltage Vcc, and the other end receives power supply voltage Vcc. but
Connected to the base of NPN transistor _Q39 . Transistor Q ₃₉ has its collector connected to the collector of PNP transistor Q ₃₈ , and its emitter connected to the transistor through resistor R ₉₉ (see Figure 11).
It is connected to the base of Q ₂₇ (see Figure 11).
Transistor Q ₃₈ has the supply voltage Vcc on its emitter
is applied, and the base is a PNP type transistor.
They are connected to the bases of Q ₄₀ and Q ₄₈ , respectively.
A trigger timing delay capacitor _C7 is connected in parallel with the trigger switch _SW2 above.
One end of this capacitor C ₇ next to the base of the transistor Q ₃₉ is connected to the base of the PNP transistor Q ₄₁ and the semi-fixed resistor RV ₆ for the time constant that determines the trigger delay time together with the above capacitor C ₇ .
are connected to one end of each. The collector of transistor Q ₄₁ is grounded, and the emitter is connected to the base of PNP transistor Q ₄₂ .
The emitter of the transistor _Q42 is connected to the collector of the transistor _Q40 , and the power supply voltage Vcc is applied to the emitter of the transistor _Q40 . Also, the collector of transistor Q ₄₂ is
It is connected to the base of NPN transistor Q ₄₇ and to the collector of NPN transistor Q ₄₃ . The emitter of transistor Q ₄₃ is grounded, and the base is connected to the base and collector of NPN transistor Q ₄₄ . The emitter of transistor Q ₄₄ is grounded, and the collector is connected to PNP transistor Q ₄₉
connected to the collector. transistor
The emitter of _Q49 is connected to the collector of the transistor _Q40 , and the base is connected to the emitter of the PNP transistor _Q45 . The collector of transistor Q ₄₅ is grounded and the base is a resistor
Power supply voltage Vcc is applied through _R53 , and NPN type transistor is applied through resistor _R54 .
Connected to Q ₄₆ collector. The emitter of transistor Q ₄₆ is grounded and the base is resistor R ₄₉
(see FIG. 11) to the collector of transistor Q ₃₀ (see FIG. 11). Further, the collector of the transistor _Q46 is connected to the other end of the time constant semi-fixed resistor _RV6 , and is also connected to the collector and base of the transistor _Q48 through the resistor _R61 . Power supply voltage Vcc is applied to the emitter of transistor _Q48 , and transistor _Q48 forms a current mirror circuit with transistors _Q38 and _Q40 , respectively. The emitter of the transistor _Q47 is grounded, and the collector receives the power supply voltage Vcc through the resistor _R55 , and the collector is connected to the NAND circuit _G32.
(see FIG. 13) and the input end of the knot circuit _G101 , respectively. The above transistors _Q40 to _Q49 and resistors _R53 to _R55 ,
R ₆₁ constitutes a differential amplifier circuit, the base of transistor Q ₄₁ is the non-inverting input terminal, the base of transistor Q 46 is the inverting input terminal, and the base of transistor Q ₄₆ is the inverting input terminal.
The collector of Q ₄₇ is the output terminal. The output terminal of the note circuit G ₁₀₁ , with the collector of the output transistor Q ₄₇ connected to the input terminal, is connected to the base of the transistor Q ₃ (see Fig. 8) through a resistor R ₁₅ (see Fig. 8). , a trigger signal S1 that inverts to 'H' level after a predetermined elapsed time after trigger switch SW ₂ is opened is applied to the same transistor _Q3 .
(see Figure 18b).

FIG. 13 shows the battery check circuit 63.
and a detailed electric circuit of the power hold release circuit 64. First, power hold release circuit 6
The explanation will start from configuration 4. Power hold release circuit 6
4 is a circuit for canceling the power hold state of the power supply hold circuit 67, and when releasing the power supply hold, when the power supply voltage Vcc is below a specified voltage, the shutter is closed and a predetermined There are three ways to forcibly turn it off when time has elapsed and during long exposure, so the NAND circuit G ₃₃ , which is the output end of the power hold release circuit 64, is provided with three input ends. It is being The output terminal of the NAND circuit G ₃₂ is connected to the first input terminal, and one input terminal of the NAND circuit G ₃₂ is connected to the first input terminal.
The collector of the transistor Q ₄₇ (see FIG. 12) is connected to the other input terminal via the knot circuit G ₃₄ to the output terminal of the comparator A ₁₀ . When the power supply voltage Vcc is below the specified level, the output of comparator A ₁₀ becomes 'L' level, so the output of NAND circuit G ₃₂ becomes 'L' level,
Power hold is released. However, the power supply voltage
If power supply hold is canceled due to a drop in Vcc, if the power supply voltage Vcc drops during exposure and power supply hold is released, the exposure error may increase or the trailing curtain holding magnet MG ₁ (see Figure 15) Since the operation may become unstable, it is made to be performed only before the exposure operation is performed. That is, the inverted signal of the AND of the collector voltage (trigger signal) of the transistor _Q47 (see FIG. 12) and the output of the not circuit _G34 is used as one signal for releasing the power hold. In addition, the above NAND circuit G ₃₃
The second input terminal of the delay circuit DL ₀ (15th
A power supply hold release signal S12, which is a delayed signal of the exposure end signal S13, is applied from the exposure end signal S13 (see figure). Furthermore, the third input terminal of the NAND circuit G ₃₃ is connected to the output terminal Q of the RS flip-flop circuit RSF ₂ (see Fig. 16), and is used as an auto-limiter signal that also serves as a power limiter signal.
It is designed to receive T2 voltage. and,
The output terminal of the NAND circuit G ₃₃ is connected to the base of a transistor Q ₃₆ (see FIG. 11) through a resistor R ₅₉ .

On the other hand, the battery check circuit 63 is a circuit for detecting whether the power supply voltage Vcc is higher than a specified voltage. This circuit has a power supply voltage at one end.
A series circuit of resistors R ₅₆ , R ₅₇ and R ₅₈ to which Vcc is applied is provided, and the connection point between resistors R ₅₆ and R ₅₇ is connected to the non-inverting input terminal of comparator A ₁₀ .
The connection points of R ₅₇ and R ₅₈ are respectively connected to the non-inverting input terminal of comparator A ₁₁ . In addition, the inverting input terminals of both comparators A ₁₀ and A ₁₁ have
A reference voltage V ₁ is applied to each. The output terminal of the comparator A ₁₀ is connected to the second input terminal of the 3-input NAND circuit G ₃₅ , the third input terminal of the 3-input NAND circuit G ₃₆ , and the input terminal of the NOT circuit G ₃₄ , respectively. Further, the output terminal of the comparator A ₁₁ is connected to the second input terminal of the NAND circuit G ₃₆ . The first input terminal of the NAND circuit G ₃₅ receives approximately 10 Hz from the timer circuit 68 shown in FIG.
A blinking periodic signal T8 consisting of a pulse signal is applied. Furthermore, the output terminal of the AND circuit G ₃₈ is connected to the third input terminal of the NAND circuit G ₃₅ and the first input terminal of the NAND circuit G ₃₆ .
One input end of G ₃₈ is connected to one end of battery check switch SW ₅ (see Figure 11), and the other input end is connected to the collector of transistor Q ₃₁ (see Figure 11) via knot circuit G ₁₀₂ . has been done. The output terminals of the above NAND circuits G ₃₅ and G ₃₆ are
The output terminal of the NAND circuit _G37 is connected to the anode of _the battery check display light emitting diode _D0 through a resistor _R60 . This light emitting diode D ₀ is arranged to correspond to the battery check display light emitting window 23, and its cathode is connected to the collector of the transistor Q ₃₇ (see FIG. 11).

Next, the operations of the power supply hold circuit 67, trigger timing adjustment circuit 52, power supply hold release circuit 64, and battery check circuit 63 shown in FIGS. 11 to 13 will be briefly described. Now, shutter release button 11 (1st,
2) is pressed, the release switch SW ₁ linked to this is closed, and the capacitor C ₆
and transistor Q ₂₆ is turned on through resistor R ₄₄ . At this point, since trigger switch SW ₂ is closed, transistor Q ₂₇ is on, transistor Q ₂₈ is turned on through resistor ₄₅ , and transistors Q ₂₀ and Q ₃₅ are turned on.
Once the transistor _Q35 is turned on, the base current is supplied from the collector of the transistor _Q29 , so the power supply hold state is maintained. And when transistor Q ₂₈ turns on,
Since transistors Q ₂₉ to Q ₃₃ are all turned on,
Transistor _Q37 is also turned on, and power is supplied to magnet drive circuit 56 and strobe control circuit 66. On the other hand, the trigger timing adjustment circuit 52
Also, base current is supplied to transistor Q ₄₆ through transistor Q ₃₀ . Then, the movable reflection mirror 31 completes its ascent, the shutter front curtain starts running, and the trigger switch SW ₂
opens, the base potential of transistor Q ₄₁ gradually decreases, and capacitor C ₇ and semi-fixed resistor
After a delay time determined by the time constant of the delay circuit, which is RV ₆ , and the ratio of resistors R ₅₃ and R ₅₄ , the output transistor
_Q47 is turned on, and the output of the NOT circuit _G101 is inverted to 'H' level (see FIG. 18b). This 'H' level signal is applied as a trigger signal S1 to the base of transistor _Q3 through resistor _R15 (see Figure 8), turning on transistor _Q3 and turning off transistors _Q5 and _Q1 . It becomes possible to integrate photocurrent by direct photometry. Subsequently, the rear curtain holding magnet MG ₁ (see Fig. 15) is demagnetized, and when a predetermined delay time has elapsed after the shutter rear curtain starts running, the delay circuit DL ₀ (first
5)) outputs the 'L' level power hold release signal S12, and the output of the NAND circuit _G33 becomes 'L' level.
It becomes H' level, transistor _Q36 turns on,
The base current of transistor Q ₃₅ is cut off,
The power hold state is released. That is, when transistor Q ₃₅ is turned off, transistors Q ₂₈ ,
Q ₃₃ and Q ₂₇ are turned off sequentially, and the magnet drive circuit 5
6 and the strobe control circuit 66 are cut off.

Furthermore, when the power supply voltage Vcc is below the specified voltage, the output of the comparator A ₁₀ becomes 'L' level, and one input terminal of the NAND circuit G ₃₂ normally goes 'H'.
level, so the output of NAND circuit _G32 is inverted to 'L' level. Therefore, transistor _Q36 is turned off, and the power hold state is released in the same way as described above. By the way, cancellation of the power supply hold state due to a drop in the power supply voltage Vcc is difficult because if the power supply voltage Vcc decreases during exposure, the exposure error will increase if the power supply hold is cut off, or the trailing curtain holding magnet MG ₁ (15th (see figure) may become unstable, so in order to prevent this, it is not done during exposure. That is, during exposure, the collector voltage of transistor Q ₄₇ , which serves as a trigger signal, is at the 'L' level, so the inverted output of the AND of this signal and the inverted signal of the output of comparator A ₁₀ is used to release the power hold. For 1
The two signals are input to the first input terminal of the NAND circuit _G33 . Therefore, the power supply voltage Vcc
The power hold is canceled due to a drop in the power level until the trigger switch SW ₂ is opened. However, if the power hold is released during this time, the movable reflective mirror 31 is mechanically locked in the mid-ascent position. I try to do that.

Furthermore, the power hold circuit 67 is used when photographing in a very dark place and resulting in a long exposure.
The wire hold is forcibly cut off after a predetermined time has elapsed. This means that when the exposure time is several minutes, the power supply voltage
It is out of consideration that it would be kinder to prevent the wear and tear of E ₁ .
Therefore, an auto limiter signal that also serves as a power limiter signal is connected to the third input terminal of the NAND circuit _G33 .
T2 is now input, and this signal T2
However, as shown in FIG. 18e, after a predetermined time (120 seconds) has elapsed since the trigger is released, it is inverted to the 'L' level, and the power hold is cut off in the same manner as described above.

Note that a signal is supplied from the emitter of the transistor Q ₃₀ to the transistor Q ₂₇ through the resistor R ₉₉ , but this is because chattering occurs when the release switch SW ₁ is opened when the movable reflection mirror 31 is lowered. This is to prevent the power hold circuit 67 from entering the power hold state again by turning off the transistor _Q27 when the trigger switch _SW2 is opened.

On the other hand, when performing a battery check,
The photographing mode switching operation knob 21 (see FIG. 2) is made to correspond to the "CHECK" indicator. Then,
Battery check switch _SW5 is turned on, and one input terminal of NAND circuit _G38 becomes 'H' level.
Now, when the power supply hold circuit 67 is in a state other than the power supply hold state, that is, during normal operation other than during shutter release operation, the output of the note circuit G ₁₀₂ is 'H'.
level, so the output of NAND circuit G ₃₈ is 'H'
level. First, in the first case, in normal conditions when the power supply voltage Vcc is higher than the specified voltage, the outputs of comparators A ₁₀ and A ₁₁ are both 'H' level, so the output terminal of NAND circuit G ₃₅ receives a blinking periodic signal. T8 is output, and the output terminal of NAND circuit _G36 becomes 'L' level. Therefore, the Nando circuit G ₃₈ '
Priority is given to the L' level output, the output terminal of the NAND circuit _G37 becomes 'H' level, and the battery check display light emitting diode _D0 is turned on. Therefore, it is displayed that the power supply voltage Vcc is higher than the specified voltage. Next, as the second case, the power supply voltage
If Vcc is above a certain specified voltage but lower than other specified voltages, that is, compared to the reference voltage V ₁ ,
Although the voltage range at the connection point between resistors R ₅₆ and R ₅₇ is high, the resistor
When the potential at the connection point between R ₅₇ and R ₅₈ is low, the output of comparator A ₁₀ is 'H' level, the output of comparator A ₁₁ is 'L' level, and the output of NAND circuit G ₃₆ is 'H' level. At the same time, the blinking periodic signal T8 is output to the output terminal of the NAND circuit _G35 . Therefore, the blinking periodic signal T8 is output to the NAND circuit _G37 , and the light emitting diode _D0 is approximately 10
It will repeatedly flash at Hz. Therefore, a message indicating that the power supply voltage Vcc has decreased is displayed, and the power supply voltage E ₁
encourage the exchange of Furthermore, in a third case, when the power supply voltage Vcc drops below the other specified voltage mentioned above and the electric circuit of the camera 10 becomes inoperable, both the outputs of the comparators A ₁₀ and A ₁₁ become 'L' level, NAND circuit G ₃₅ ,
All the outputs of _G36 become 'H' level, and the output of NAND circuit _G37 becomes 'L' level. Therefore, the light emitting diode _D0 continues to be off without being turned on, and a message is displayed that the power supply voltage Vcc is below the specified voltage.

Note that if the shooting mode switching operation knob 21 is operated and the battery check switch SW ₅ is closed during the shutter release operation, the output of the note circuit G ₁₀₂ becomes 'L' level, so the NAND circuit G The output of NAND circuit _G38 becomes 'L' level, and accordingly, the output of NAND circuit _G37 becomes 'L' level, so that the battery check indication by light emitting diode _D0 is not performed. Also, when checking the battery,
Transistor Q ₃₄ through transistor Q ₂₃
The magnet drive circuit 56 is forcibly turned on.
and forcibly energizes the strobe control circuit 66,
The battery check is performed when the current consumption is at its maximum.

FIG. 14 shows a detailed electric circuit of the strobe determination circuit 62. This strobe determination circuit 62 determines whether the strobe is powered on or not and whether charging is completed by determining the current level of a signal S15 input from the strobe through one signal line. This is a circuit for detection. The NPN transistor Q ₅₀ is a diode-connected transistor, and the power supply voltage Vcc is applied to the emitter, and the collector and base are connected to the above-mentioned strobe mounting shoe 2.
4 or strobe connection connector 25 (first,
It is connected to the electric circuit of the strobe (not shown) through the electric contacts of the strobe (see Figure 2). A series circuit of resistors R ₆₇ and R ₆₅ is connected in parallel with this transistor Q ₅₀ , and a PNP type transistor Q ₅₁ is connected to the resistor R ₆₇ with its emitter as a power supply and its collector as a strobe barrier. connected in parallel. this transistor
The collector of Q ₅₁ is also connected to the base of PNP transistor Q ₅₂ , and the base is connected to the emitter of transistor Q ₅₂ and the PNP transistor
They are connected to the bases of Q ₇₇ and Q ₅₆ , respectively.
The collector of the transistor _Q52 is grounded through a resistor _R68 , the power supply voltage Vcc is applied to the emitter of the transistor _Q77 , and the collector is grounded through resistors _R70 and _R69 in series.
The connection point of resistors R ₇₀ and R ₆₉ is connected to the base of NPN transistor Q ₅₃ , whose emitter is grounded and whose collector is connected to the resistor _.
Power supply voltage Vcc is applied through R ₇₁ and R ₇₂ in series. The connection point between resistors R ₇₁ and R ₇₂ is connected to the bases of PNP transistors Q ₅₄ and Q ₅₅ , respectively, and the power supply voltage Vcc is applied to the emitter of transistor Q ₅₄ , and the collector is connected to the resistor.
Grounded through R ₇₉ . Further, a signal line for transmitting a strobe power-on signal S14 is drawn out from the collector of the transistor _Q54 , and is connected to an input port I13 of the CPU 50 (see FIG. 7). The transistor _Q55 has the power supply voltage Vcc applied to its emitter, and its collector is connected to the base and collector of the NPN transistor _Q57 and the base of the NPN transistor _Q58 through a resistor _R73 . The emitter of transistor _Q57 is grounded, the collector of transistor _Q58 is connected to the collector of transistor _Q56 , and the emitter is grounded through resistor _R74 . Transistor _Q56 has the power supply voltage Vcc applied to its emitter,
The collector is further grounded through a resistor R ₇₅ and connected to the base of an NPN transistor Q ₅₉ through a resistor R ₇₆ . Transistor Q ₅₉ connects the supply voltage through resistor R ₇₇ to the collector
Vcc is applied and the collector is grounded. In addition, the transistor Q ₅₉ has its collector connected to the input terminal of the not circuit G ₃₉ ,
The output terminal of the knot circuit _G39 is connected to one input terminal of the AND circuit _G40 . The other input terminal of the AND circuit _G40 is connected to the inverting output terminal of the RS flip-flop circuit _RSF4 (see Fig. 16) via the knot circuit _G41 , and is configured to receive the inverted signal of the strobe charging gate signal T4. It's getting old. The output terminal of the AND circuit G ₄₀ is connected to the base of an NPN transistor Q ₆₀ through a resistor R ₇₈ , the emitter of the transistor Q ₆₀ is grounded, and the collector is connected to the cathode of a light emitting diode D ₁ for indicating the completion of strobe charging. It is connected to the. This light emitting diode _D1 is connected to the photographing information display device 3.
It is built into the camera's camera 9, and displays a "〓" shape in the viewfinder to indicate when the strobe is fully charged. The anode of the light emitting diode _D1 is connected to one end of the constant current circuit _CC3 , and the anode of the light emitting diode D1 is connected to one end of the constant current circuit _CC3.
Power supply voltage Vcc is applied to the other end.

Next, the operation of the strobe determination circuit 62 configured as described above will be briefly explained. First, when the power switch of the strobe (not shown) is turned on,
A current of about 10 μA flows toward the strobe as the strobe power signal S15. Then transistor Q ₅₂ turns on, followed by transistor Q ₅₁ ,
Transistors Q ₇₇ , Q ₅₃ , and Q ₅₄ are turned on in sequence. Therefore, the collector of transistor Q ₅₄ is '
It becomes H' level. Also, transistor Q ₅₅ ,
Q ₅₆ and Q ₅₈ are also turned on, but the strobe power signal S15 is
At around 10 μA, the base current of transistor Q ₅₆ is small and the collector potential is not high enough to supply enough current to the base of transistor Q ₅₉ , so transistor Q ₅₉ remains off. Then,
The output of the NOT circuit _G39 becomes 'L' level, and the output of the AND circuit _G40 also becomes 'L' level, so that the transistor _Q60 does not turn on and the light emitting diode _D1 for indicating completion of charging does not light up. Next, when the strobe is fully charged, approximately 100μA is applied to the side of the strobe.
The current starts to flow as the strobe charge signal S15. Then, the collector potential of transistor _Q56 becomes sufficiently high, and sufficient base current flows through transistor _Q59 , turning on transistor _Q59 . As a result, the collector potential of transistor _Q59 decreases, and the output of note circuit _G39 becomes 'H'.
level. Above strobe charging gate signal T4
is a signal that is at the 'H' level for about 2 seconds after the strobe fires, so the output of the AND circuit _G40 is at the 'L' level for 2 seconds after the strobe fires.
During other periods, the output of the AND circuit _G40 is at the 'H' level, and the transistor _Q60 is turned on. Therefore, current flows from the constant current circuit _CC3 to the light emitting diode _D1 , causing the diode _D1 to emit light, indicating that the strobe has been charged. The reason why the strobe charging completion display is not displayed for 2 seconds after the strobe fires is that the strobe is turned on and off at approximately 100μA after the strobe fires, through the same signal line as the strobe power signal and strobe charge signal S15. This is because the light emitting diode _D1 needs to be disabled during this period since the appropriate exposure signal is sent back. Note that the flash photographing suitability display is performed by blinking the liquid crystal display panel of the photographing information display device 39, as will be described later.

FIG. 15 shows the selection circuit 55, magnet drive circuit 56 and strobe control circuit 66 shown in FIG.
shows a detailed electrical circuit. The first selection circuit 55 is configured to select whether the magnet drive circuit 56 should be controlled by the shutter control signal S17 based on direct photometry or by the shutter control signal S16 output from the CPU 50, depending on the shooting mode. It is a circuit. 1st of Nando circuit G ₄₈
The input terminal of is connected to one end of auto switch SW ₄ (see Figure 7), and a signal that becomes 'H' level only in the auto mode, which is the same as that input to input port I0 of CPU 50, is applied. ing. Further, the second input terminal of the NAND circuit G ₄₈ is connected to the output terminal of the NAND circuit G ₃ (see FIG. 7) via the knot circuit G ₄₆ , and is connected to the input terminal of the CPU 50.
The inverted signal of the signal that becomes 'H' level only in the same memory mode as input to I6 is applied. Further, the third input terminal of the NAND circuit G ₄₈ is connected to the output terminal of the NAND circuit G ₉ (see FIG. 7) via the knot circuit G ₄₇ .
An inverted signal of the same signal that is input to the input port I2 of the CPU 50 and which becomes 'H' level only in the spot mode is applied. Therefore, NAND circuit G ₄₈ is in auto mode,
Only when a mode that is neither memory mode nor spot mode, that is, average direct auto mode, is selected, all inputs become 'H' level and the output becomes 'L' level. The inverted signal of the signal applied to the first input terminal of the NAND circuit G ₄₈ is inputted to one input terminal of the NAND circuit G ₅₁ via the NAND circuit G ₄₉ , and the other The input terminal is connected to one end of the manual switch SW ₃ (see Fig. 7) via the notebook circuit G ₅₀ , and becomes 'H' level only when the same manual signal is input to the input port I1 of the CPU 50. The inverted signal of the signal is input. Therefore, the output of the NAND circuit _G51 is at the 'L' level only in the shooting mode that is neither the auto mode nor the manual mode, that is, the off mode. The output end of NAND circuit G ₄₈ is connected to one input end of NAND circuit G _{52, and the NAND circuit G 48} is connected to one input end of NAND circuit G 52.
The output terminal of G ₅₁ is connected to the other input terminal of the NAND circuit G ₅₂ , and is connected to the NAND circuit through one input terminal of the NAND circuit 62 and the not circuit G ₆₃ .
Each is also connected to one input end of the G ₆₄ . The output end of NAND circuit G ₅₂ is AND circuit G ₇₀
is connected to _the other input terminal of the NAND _circuit G ₆₆ and one input terminal of the AND circuit G ₆₉ , respectively _. are respectively connected to the other input terminal. The output of this NAND circuit G ₅₂ is the NAND circuit G ₄₈ or G ₅₁
When any output is 'L' level, it becomes 'H' level. That is, it is determined whether the shooting mode is average direct auto mode, off mode, or other shooting mode, and the output of NAND circuit G ₅₂ is set to 'H' only in average direct auto mode or off mode.
level. Consequently, in the off mode, only the maximum exposure time is regulated, and photography is performed using the same metering method as in the average direct auto mode. In addition, this NAND circuit 5
The output of No. 2 is inputted to the operational amplifier A ₂ (see FIG. 8) as the bias switching signal S4, and also serves to switch the bias current of the operational amplifier A ₂ according to the photographing mode as described above.

The other input terminal of the NAND circuit G ₅₄ is connected to the output terminal of the NAND circuit G ₂₈ (see FIG. 10),
The shutter control signal S17 by direct photometry is input, and one input terminal of the NAND circuit _G55 is connected to the output port O9 of the CPU 50 (see Fig. 7), and is connected to the memory, manual, A shutter control signal S16 for each spot mode is input. The output terminal of the NAND circuit G ₅₄ is connected to the second input terminal of the 3-input NAND circuit G ₅₇ .
The output terminal of _G55 is connected to the third input terminal of NAND circuit _G57 . Also, the first of the NAND circuit G ₅₇
The input terminal of is connected to the output terminal Q of the RS flip-flop circuit RSF ₀ (see Fig. 16) via the knot circuit G ₅₆ .
connected to the trigger and approximately after the trigger opens.
An inverted signal of the high-speed limiter signal T0 (see FIG. 18c) that maintains the 'H' level for 500 μs is input. This high speed limiter signal
T0 is a signal to determine the shortest shutter speed. That is, if the average direct auto mode or off mode is currently selected, the output of the NAND circuit _G54 will be at the 'L' level only while the shutter control signal S17 by direct photometry is at the 'H' level. On the other hand, the output of NAND circuit _G55 is at 'H' level regardless of the level of shutter control signal S16 in manual mode etc.
The output of NAND circuit G ₅₇ is regulated by the output of NAND circuit G ₅₄ when the output of NOT circuit G ₅₆ is 'H' level, and is 'H' level only when shutter control signal S17 is 'H' level. becomes. In other words, the shutter control signal S17 based on direct photometry is output to the output terminal of the NAND circuit _G57 .
Similarly, in memory hold, manual mode, and spot mode, the shutter control signal S16 is output to the output terminal of the NAND circuit _G57 . Here, the high speed limiter signal T0 is the 18th limiter signal T0.
Approximately after the trigger opens, as shown in Figure c.
Since the 'H' level is held for 500 μs, the output of the NAND circuit G ₅₇ remains at the 'H' level during this period, regardless of the outputs of the NAND circuits G ₅₄ and G ₅₅ , and the trailing curtain holding magnet MG ₁ is held at the 'H' level. Never demagnetized.
In other words, the shortest shutter time is limited to 1/2000 seconds by signal T0.

One input terminal of the AND circuit G ₇₀ is connected to the collector of the transistor Q ₅₄ (see FIG. 14), and is configured to receive the strobe power-on signal S14. And circuit G ₇₀
The output terminal of is connected to one input terminal of a NAND circuit G ₆₀ and the other input terminal of a NAND circuit G ₅₈ through a knot circuit G ₅₉ . One input terminal of the NAND circuit G ₅₈ is connected to the output terminal of the NAND circuit G ₅₇ , and the other input terminal of the NAND circuit G ₆₀ is connected to the output terminal of the RS flip-flop circuit RSF ₁ (see Fig. 16). Q, and the strobe synchronization time signal T3 is input thereto. As shown in Fig. 18f, this strobe synchronization time signal T3 continues for 16ms after the trigger is opened.
This is a signal that maintains H' level. Above Nando circuit G ₅₈
The output end of is connected to one input end of NAND circuit G ₆₁ , and the output end of NAND circuit G ₆₀ is connected to one input end of NAND circuit G 61.
Connected to the other input end of G ₆₁ . Now, in the average direct auto mode or off mode, when the strobe power is not turned on or the strobe is not attached to the camera 10, the strobe power on signal S14 is at the 'L' level, so , the same signal as the output signal of the NAND circuit _G57 is output to the output terminal of the NAND circuit _G61 .
Also, when the strobe is attached and the power is turned on from this state, the strobe power on signal S14 goes 'H'.
level, and the strobe synchronization time signal T3 is output to the output terminal of the NAND circuit _G61 .
Therefore, the shutter speed is 1/60 of a constant speed. Note that in a shooting mode other than the average direct auto mode or off mode, the output of the AND circuit _G70 is at the 'L' level, and the strobe synchronization time signal T3 is no longer involved in shutter control.
By the way, as long as the strobe power is on, the shutter speed must be set to the strobe synchronization speed and the strobe will fire. At times, a method was used in which the strobe was not emitted, but this method went against the photographer's intention, so this was done to correct this problem. In other words, in conventional cameras, when the subject is bright and the shutter speed is high, there is almost no need to fire the strobe, so the strobe was not fired in order to save power consumption of the strobe. If this is done, it may be contrary to the photographer's intention when creating the image, which is inconvenient, so the shutter time is forcibly set to the strobe synchronization time to cause the strobe to emit light.

The output terminal of the NAND circuit _G61 is connected to the base of a magnet control transistor _Q66 of the magnet drive circuit 56 through a resistor _R91 . This magnet control transistor Q ₆₆
is made up of NPN transistors,
Its emitter is grounded, and its collector receives power supply voltage Vcc through the coil of trailing curtain holding magnet _MG1 . This supply voltage
As described above, Vcc is applied only when the power supply hold circuit 67 (see FIG. 11) holds the power supply. Also, Nando circuit G ₆₁
The output terminal of the circuit G61 is connected to the input port I12 of the CPU 50 (see FIG. 7), and the output of the circuit _G61 is inputted to the input port I12 as the exposure end signal S13. Furthermore, the output end of the NAND circuit G ₆₁ is connected to the NAND circuit through the delay circuit DL ₀ .
G ₃₃ (see Figure 13) is connected to the second input terminal of the circuit G 61, and the output of the circuit G ₆₁ is delayed for a predetermined time by the delay circuit DL ₀ , and the power hold release signal S12 is output.
It is now input to the NAND circuit _G33 . The delay circuit DL ₀ is provided in the shutter drive circuit 56 and the strobe control circuit 66.
is supplied with power through the power hold circuit 67 (see FIG. 11), and if the exposure end signal S13 output from the NAND circuit G ₆₁ is used to directly release the power hold circuit 67, This is to prevent the strobe control circuit 66 from operating normally.

As mentioned above, the output terminal of NAND circuit G ₅₁ is
One input end of the NAND circuit G ₆₂ and the knot circuit
It is also connected to one input end of the NAND circuit G ₆₄ through G ₆₃ . The other input terminal of the NAND circuit G ₆₂ is connected to the RS flip-flop circuit RSF ₂ (16th
(see figure) is connected to the output terminal Q of the same circuit.
Auto limiter signal T2 is input from RSF ₂ . This auto limiter signal
As shown in FIG. 18e, T2 is a signal that maintains the 'H' level for 120 seconds even after the trigger is released, and is a signal that regulates the maximum exposure time in auto mode. The other input terminal of the NAND circuit G ₆₄ is connected to the RS flip-flop circuit RSF ₃ (16th
(see figure) is connected to the output terminal Q of the same circuit.
Off-limiter signal T1 is input from RSF ₃ . This off-limiter signal T1 is
As shown in Figure 18d, 24m after the trigger is released.
This is a signal that maintains the 'H' level for a period of s, and is a signal that determines the shutter speed in off mode. The output end of the NAND circuit _G62 is connected to one input end of the AND circuit _G65 , and the output end of the NAND circuit _G64 is connected to the other input end of the AND circuit _G65 . And the output terminal of AND circuit G ₆₅ is a resistor
It is connected to the base of NPN type transistor Q ₆₃ through R ₈₀ , the emitter of transistor Q ₆₃ is grounded, and the collector is connected to the above transistor.
Connected to the base of the Q ₆₆ . Now, when the output of the NAND circuit G ₅₁ is at the 'L' level, that is, in the off mode, the output of the NOT circuit G ₆₃ is at the 'H' level, and the output terminal of the AND circuit G ₆₅ receives the inverted signal of the off limiter signal T1. is output. Therefore, after 24ms have passed after the trigger is released, the transistor
_Q63 is turned on, transistor _Q66 is turned off, magnet _MG1 is demagnetized, and the shutter is closed regardless of the output of NAND circuit _G61 .
Also, when the mode is not off, the AND circuit G ₆₅
An inverted signal of the autolimiter signal T2 is outputted to the output terminal of the autolimiter signal T2. Therefore, after the trigger is released, approximately 2
After the minute has elapsed, transistor Q ₆₃ turns on, forcing the shutter to close in the same way.

Next, the strobe control circuit 66 will be described.
PNP transistor Q ₆₄ has a base resistor R ₈₅
through the RS flip-flop circuit RSF ₁ (first
(see Figure 6), and is adapted to receive the strobe synchronization time signal T3. And the collector of this transistor Q ₆₄ is grounded and the emitter is connected through resistor R ₈₆
Connected to the base of the PNP transistor _Q65 . The base of the transistor Q ₆₅ is the resistor R ₈₇
It is connected to the emitter of the same transistor Q65 through the transistor _Q65 , and the power supply voltage Vcc is applied to this emitter. In addition, the collector of the transistor Q ₆₅ is grounded through a series circuit of resistors R ₈₈ and R ₈₉ , and the connection point of both resistors R ₈₈ and R ₈₉ is connected to the gate of the strobe trigger thyristor SCR ₁ through a capacitor C ₈ . It is connected to the. The gate of thyristor SCR ₁ is grounded through a resistor R ₉₀ , and the cathode is directly grounded. Further, the anode of the thyristor SCR ₁ is connected to the electric circuit of the strobe through the electric contacts of the strobe mounting shoe 24 (see Figure 2) or the connection connector 25 (see Figure 1). When the thyristor SCR ₁ is fired, a strobe light emission signal S19 is transmitted to the strobe. Suppose now that a strobe is attached to the camera 10 and after charging is completed, the shutter release button 11 (see FIGS. 1 and 2) is pressed. Then, the front shutter curtain runs and it takes about 16ms after the trigger is released.
elapses, the strobe synchronization second signal T3 becomes 'L'.
level, transistor Q ₆₄ turns on, transistor Q ₆₅ turns on, a pulse voltage is applied to the gate of thyristor SCR ₁ through capacitor C ₈ , and thyristor SCR ₁ turns on. Then, a trigger current flows from the strobe through the thyristor SCR ₁ as a strobe light emission signal S19, and the strobe emits light.

On the other hand, one input terminal of the NAND circuit G ₆₈ is connected to the collector of the transistor Q ₅₄ (see Figure 14) to receive the strobe power-on signal S14, and the other input terminal is connected to the output terminal of the knot circuit _G28 (see FIG. 10), and receives the shutter control signal S17 by direct photometry. And the output terminal of NAND circuit G ₆₈ is AND circuit G ₆₉
is connected to the other input terminal of the NAND circuit _{G66 via the NOT circuit G67 .} One input terminal of the NAND circuit G ₆₆ and the AND circuit G ₆₉ is connected to the output terminal of the NAND circuit G ₅₂ , respectively. The output end of the NAND circuit G ₆₆ is connected to the PNP transistor Q ₆₁ through the resistor R ₈₁ .
The output end of the AND circuit G ₆₉ is connected to the base of the NPN transistor Q ₆₂ through the resistor R ₈₂
connected to the base of. transistor Q ₆₁
Power supply voltage Vcc is applied to the emitter of
The collector is connected to the collector of transistor _Q62 through a series circuit of resistors _R83 and _R84 .
The emitter of transistor Q ₆₂ is grounded. The connection point of the resistors R ₈₃ and R ₈₄ is connected to the electric circuit of the strobe through the electric contact of the strobe mounting shoe 24 (see Figure 2) or the connection connector 25 (see Figure 1). and the strobe dimming signal S18 is sent to the strobe.
It has come to convey the following. Now, in average direct auto mode or off mode, the output of NAND circuit G ₅₂ is at 'H' level, so the gates of NAND circuit G ₆₆ and AND circuit G ₆₉ are opened, and the output terminal of AND circuit G ₆₉ is opened. The output signal of the NAND circuit _G68 is outputted to the output terminal of the NAND circuit _G66 , and the inverted signal of the output of the NAND circuit G68 is outputted to the output terminal of the NAND circuit _G66 . When a strobe is attached to the camera 10 and flash photography is performed using direct metering, the strobe power-on signal S14 is at the 'H' level, so the output terminal of the NAND circuit _G68 is connected to the shutter control signal S17 for direct metering. An inverted signal is output. Now, assume that the shutter release button 11 (see FIGS. 1 and 2) is pressed in this state, the shutter front curtain runs, and exposure is started. While the exposure level does not reach the appropriate level, the shutter control signal S17 is at the 'H' level, therefore the output of the NAND circuit _G66 is at the 'L' level, and the output of the AND circuit _G69 is also at the 'L' level. . Therefore, the transistor
Q ₆₁ is turned on, transistor Q ₆₂ is turned off, the connection point between resistors R ₈₃ and R ₈₄ is electrically connected to the wire through resistor R ₈₃ , and the strobe dimming signal S18 becomes 'H' level. . When the strobe fires and the amount of exposure light reaches the appropriate level, the shutter control signal S17 is inverted to 'L' level, transistor Q ₆₁ is turned off, transistor Q ₆₂ is turned on, and the strobe light control signal S18 is turned on. becomes 'L'. As a result, a strobe light control circuit (not shown) is activated, and the strobe light emission is stopped. Note that when the camera 10 is neither in the average direct auto mode nor in the off mode, the output of the NAND circuit G ₅₂ is at the 'L' level, the output of the NAND circuit G ₆₆ is at the 'H' level, and the output of the AND circuit G ₆₉ is at the 'H' level. The output becomes 'L' level, transistors _Q61 and _Q62 are both turned off, and the strobe dimming signal S18 no longer has any effect on the dimming circuit next to the strobe.

FIG. 16 shows a detailed electrical circuit of the timer circuit 68. This timer circuit 68 is
This circuit generates various timer signals for controlling the camera 10 of the present invention, and consists of 27 T-type flip-flops connected continuously based on the clock pulse CK (see FIG. 18a) with a fundamental frequency of 32.768 KHz. a selection circuit that selects or combines the outputs of the circuits TF ₀ to _{TF 26} and the T-type flip-flop circuits TF ₀ to _{TF 26} to create a desired timer signal;
and a reset path for initializing the timer circuit 68. The continuously connected T-type flip-flop circuits TF ₀ to _{TF 26} form a binary counter, and the output terminals Q ₀ to Q ₂₆ of each T-type flip-flop circuit TF ₀ to TF ₂₆ have 2 ^{-(n +1)} ×
A pulse signal of 32.768 KHz (where n is an arbitrary integer of 0≦n≦26 and corresponds to the subscript of the circuit TFn) is output. On the other hand, the data input terminal D of the D-type flip-flop circuit _DF2 is connected to the output terminal of the NAND circuit _G3 (see Figure 7), and the data input terminal D of the D-type flip-flop circuit DF2 is connected to the output terminal of the NAND circuit G3 (see Fig.
The same memory mode detection signal as the signal input to input port I6 of 0 is input. Also, the clock input terminal CK of this D-type flip-flop _DE2
is a clock pulse with a fundamental frequency of 32.768KHz.
CK is input. The inverting output terminal of the D-type flip-flop circuit _DF2 is connected to one input terminal of the NAND circuit _G79 , and the other input terminal of the NAND circuit _G79 is connected to the memory mode detection terminal input to the input port I6. A signal is being input. Above D-type flip-flop circuit DF ₂ and NAND circuit G ₇₉
forms a well-known synchronous differential circuit, and the data input terminal of flip-flop circuit _DF2 is 'H'.
From the moment it reaches the level, a negative pulse synchronized with the clock pulse CK is generated at the output terminal of the NAND circuit _G79 . In addition, a D-type flip-flop circuit DF ₃
The data input terminal D of is connected to the collector of the transistor _Q32 (see Fig. 11), and the release signal S0 is inputted thereto, and the clock pulse CK is applied to the clock input terminal CK. . The inverting output terminal of the flip-flop circuit DF ₃ is connected to one input terminal of the NAND circuit G ₈₀ , and the release signal _S0 is applied to the other input terminal of the NAND circuit G ₈₀ . G ₈₀ forms a synchronous differentiator circuit similarly to the circuits DF ₂ and G ₇₉ described above. moreover,
The data input terminal D of the D-type flip-flop circuit _DF4 is connected to the output terminal of the not circuit _G101 via the not circuit _G90 , and the inverted signal of the trigger signal S1 is inputted thereto. A clock pulse CK is applied to the input end CK. The inverting input terminal Q of each flip-flop circuit _DF4 is connected to one input terminal of a NAND circuit _G81 , and the inverted signal of the trigger signal S1 is applied to the other input terminal of the NAND circuit _G81 . The flip-flop circuit DF ₄ and the NAND circuit G ₈₁ form a synchronous differentiator circuit, similar to the circuits DF ₂ and G ₇₉ described above. The three synchronous differential circuits described above are circuits for resetting the timer circuit 68, and are used to reset the timer circuit 68 when the memory mode is selected, when the shutter is released (actually, when the power supply hold circuit 67 is energized). ), and when exposure is started (when the trigger signal goes to 'L' level), a reset pulse is generated. It is necessary for the timer circuit 68 to indicate a reference point from which to start the operation of the timer, and this is done by resetting the timer circuit 68 using the above-mentioned reset pulse. The output terminals of the NAND circuits G ₇₉ , G ₈₀ and G ₈₁ from which the reset pulse is output are connected to each input terminal of the 3-input AND circuit G ₈₂ , and the output terminal of the AND circuit G ₈₂ is connected to the NOT circuit G _{91 .} It is connected to each reset input terminal of T-type flip-flop circuits TF ₀ to _{TF 26} through the T-type flip-flop circuits TF 0 to TF 26 . Further, the output terminal of the AND circuit _G82 is connected to each reset input terminal R of the RS flip-flop circuits _RSF0 to _RSF3 , _RSF6 , and _RSF7 forming the selection circuit, respectively.
It is also connected to one input end of OR circuit _G84 .

The inverting output terminal ₃ of the T-type flip-flop circuit TF ₃ is connected to the set input terminal of the RS flip-flop circuit RSF ₀ , and from the output terminal Q,
As shown in Figure 18c, the trigger signal S1 is
Even after being inverted to the H' level, the high-speed limiter signal T0 is output, which holds the 'H' level for 0.5 ms and then inverts to the 'L' level. Further, the output terminal of a NAND circuit _G83 is connected to the set input terminal S of the RS flip-flop circuit _RSF3 , and the output terminal _Q3 of the T-type flip-flop circuit _TF8 is connected to one input terminal of the NAND circuit _G83 . is connected to the other input terminal, and the output terminal _Q7 of a T-type flip-flop circuit _TF7 is connected to the other input terminal. Therefore, the output terminal Q of the RS flip-flop circuit _RSF3 receives a trigger signal as shown in Fig. 18d.
For 24ms after S1 reverses to 'H'level'
An off-limiter signal T1 is output which maintains the H' level and then inverts to the 'L' level. Further, the set input terminal S of the RS flip-flop circuit RSF ₂ is connected to the inverting output terminal ₂₁ of the T-type flip-flop circuit TF ₂₁ , and the output terminal Q is connected to the set input terminal S of the RS flip-flop circuit RSF 2, as shown in FIG. 18e.
Even after trigger signal S1 inverts to 'H' level
Maintain 'H' level for 120s, then 'L'
An autolimiter signal T2 that is inverted in level is output. Furthermore, at the set input terminal S of the BS flip-flop circuit _RSF1 ,
Inverting output terminal ₈ of T-type flip-flop circuit TF ₈
is connected to the output terminal Q, and as shown in FIG.
Thereafter, the strobe synchronization time signal T3, which is inverted to 'L' level, is output. The inverted output terminal of this RS flip-flop circuit _RSF1 is connected to the data input terminal D of the D-type flip-flop circuit _DF5 , and also connected to the NAND circuit.
It is also connected to one input end of the _G89 . A clock pulse CK is applied to the clock input terminal CK of the D-type flip-flop circuit _DF5 , and the inverted output terminal of the circuit _DF5 is connected to the other input terminal of the NAND circuit _G89 . The output end of the NAND circuit _G89 is connected to the set input end S of the RS flip-flop circuit _RSF4 , and the reset input end R of the RS flip-flop circuit _RSF4 is connected to the output end of the OR circuit _G84 . . OR circuit G ₈₄
The other input terminal of is a T-type flip-flop circuit.
Connected to the inverting output terminal ₁₅ of TF ₁₅ . Therefore, from the inverted output terminal Q of the RS flip-flop circuit _RSF4 , as shown in FIG. Strobe charge gate signal returns to 'L' level after 2 seconds have elapsed
T4 is now being output. In addition, the set input terminal of the RS flip-flop circuit _RSF6 has a
The output terminal of a 3-input NAND circuit G ₈₅ is connected to each input terminal of the NAND circuit G ₈₅ , and each output terminal of T-type flip-flop circuits TF ₈ , TF ₆ and TF ₅ is connected to each input terminal of the NAND circuit G 85.
Q ₈ , Q ₆ and Q ₅ are connected respectively. Therefore, the inverting output terminal of the RS flip-flop circuit RSF ₆ has a strobe under limit which inverts to 'H' level 22ms after the trigger signal S1 inverts to 'H' level, as shown in Fig. 18h. Tutter signal T6 is now output.
Furthermore, a T-type flip-flop circuit is connected to the set input terminal S of the RS flip-flop circuit _RSF7 .
The inverted output terminal ₂₆ of the TF ₂₆ is connected to the output terminal Q, and as shown in FIG. Memory limiter signal inverted to level
T7 is now being output. Furthermore, from the output terminal _Q11 of the T-type flip-flop circuit _TF11 ,
The blinking period signal T8, which is close to about 10 Hz, is output.

FIG. 17 shows a detailed electric circuit of the DA conversion circuit 58. This D-A conversion circuit 58
is a successive approximation type A-D together with a comparator A ₁₂ (see FIG. 7) forming the second comparison circuit 59.
A conversion circuit is configured to convert the brightness value signal S6 or the analog calculation value (SV-AV) of the film sensitivity value SV and the aperture value AV into a digital signal, and the CPU 5
It serves to input 0. This DA converter circuit 58 is a known 8-bit ladder type DA converter circuit, and includes 16 analog switches _AS0 to _AS7 ,
AS ₁₀ to AS ₁₇ , eight knot circuits G ₁₅₀ to _{G 157} ,
It consists of 16 resistors _R149 to _R157 , _R160 to _R166 , and an operational amplifier _A21 . The reference voltage is connected to the input terminals of half of the analog switches A ₀ to AS ₇ , AS ₀ to AS ₇ and AS ₁₀ to AS ₁₇ above.
Vr ₁ is applied to each of them, and a reference voltage Vr ₂ higher than the reference voltage Vr 1 is applied to the input terminals of the remaining half of the analog switches AS ₁₀ to AS _{17 ,} respectively. In addition, the analog switch AS ₀ ~
One control input of AS ₇ and analog switch
The other control input terminal of AS ₁₀ to _{AS 17} is connected to the CPU 50.
Each bit signal b ₀ to b ₇ is applied from the output port O6 of the analog switch AS ₀ to
Other control input of AS ₇ and analog switch
Inverted signals of the respective bit signals _b0 to _b7 are applied to one control input terminal of _AS10 to _AS17 through knot circuits _G150 to _G157 , respectively. Furthermore, the output terminals of analog switches AS ₀ to AS ₇ and the output terminals of analog switches AS ₁₀ to _{AS 17} are connected in pairs, respectively, and resistors R ₁₅₀ to
Each is connected to one end of R ₁₅₇ . Resistance R ₁₅₀
The other end of ~R ₁₅₇ is a resistor R ₁₆₉ connected in series,
Connected to each connection point of R ₁₆₀ to R ₁₆₆ . That is,
The other end of resistor R ₁₅ is connected to the connection point of resistors R ₁₄₉ and R ₁₆₀ ,
The other end of resistor R ₁₅₁ is connected to the connection point of resistors R ₁₆₀ and R ₁₆₁ ,
The other end of resistor R ₁₅₂ is connected to the connection point of resistors R ₁₆₁ and R ₁₆₂ ,
The other end of resistor R ₁₅₃ is connected to the connection point of resistors R ₁₆₂ and R ₁₆₃ ,
The other end of resistor R ₁₅₄ is connected to the connection point of resistors R ₁₆₃ and R ₁₆₄ ,
The other end of resistor R ₁₅₅ is connected to the connection point of resistors R ₁₆₄ and R ₁₆₅ ,
The other end of resistor R ₁₅₆ is connected to the connection point of resistors R ₁₆₅ and R ₁₆₆ ,
The other end of the resistor R ₁₅₇ is connected to the connection point between the resistor R ₁₆₆ and the non-inverting input terminal of the operational amplifier A ₂₁ . resistance
The reference voltage Vr ₁ is applied to one end of R ₁₄₉ , and the resistance values of each resistor R ₁₄₉ to R ₁₅₇ are the same as each resistor R ₁₆₀ to R 157.
It is set to be twice the resistance value of _R166 . The operational amplifier A ₂ has its inverting input terminal connected to its output terminal to form a voltage follower circuit, and its output terminal is connected to the comparator A ₁₂ (seventh
(see figure) is connected to the inverting input terminal of the

The CPU 5 is connected to the output terminal of the operational amplifier A ₂₁ which is the output terminal of the D-A conversion circuit 58 configured in this way.
Depending on the value of each bit signal output from 0, V _DA = Vr ₁ + Vr ₂ − Vr ₁ /2 (b ₇ 2 ⁰ + b ₆ 2 ^-1 + b ₅ 2 ^-2 + b ₄ 2 ^-3
+b ₃ 2 ^-4 +b ₂ 2 ^-5 +b ₁ 2 ^-6 +b ₀ 2 ^-7 ) The output voltage V _DA is obtained. Furthermore, this D-A
The conversion circuit 58 is already known, and
Since this is not related to the gist of the present invention, a detailed explanation of its operation will be omitted. Furthermore, regarding the operation of the successive approximation type A-D converter circuit formed by the combination of the D-A converter circuit 58 and the comparator A ₁₂ ,
This will be explained in detail in the flowchart explanation later.

19A and 19B respectively show the electrode structure of the liquid crystal display board forming the photographing information display device 39. FIG. 19A shows the pattern of segment electrodes for display, and FIG. 19B shows the pattern of the segment electrodes for display. The patterns of back electrodes facing the segment electrodes with a liquid crystal layer in between are shown. This photographing information display device 39 adopts a 1/3 duty/1/3 bias driving method, as will be explained in detail later.
The above-mentioned back electrode is the first to third back electrode RE ₁
~RE is divided into ₃ . Furthermore, the segment electrodes corresponding to the first to third back electrodes RE ₁ to _{RE 3} are connected by one signal line in a set of three at most, and as shown in FIG. Each segment electrode connected by a signal line corresponds only to a different back electrode RE ₁ to RE ₃ . Therefore, the segment electrode is
A first segment electrode group corresponding to the first back electrode RE ₁ , a second segment electrode group corresponding to the second back electrode RE ₂ , and a third segment corresponding to the third back electrode RE ₃ . It can be distinguished into electrode groups. The segment electrodes included in the first segment electrode group include horizontally long rectangular point display segment electrodes ("OVER" electrodes, upper "LONG" electrodes) arranged in a row in a straight line in the horizontal direction at the top. ), and "±" electrodes for correction indication. Further, as the segment electrodes included in the second segment electrode group,
“OVER” is a horizontally long rectangular bar display segment electrode that is arranged horizontally in a straight line in the middle.
There are electrodes, “LONG” electrodes, “MEMO” electrodes, and “SPOT” electrodes. Furthermore, the third segment electrode group includes a shutter time electrode of "1" to "2000", a fixed point match index electrode formed in a circular and triangular shape below the shutter time electrode, and a fixed point match index electrode. "-" and "+" electrodes are provided at corresponding positions on the left and right to indicate overexposure and underexposure during flash photography, as well as "MANUAL", "AUTO", "HIGH",
There are electrodes for displaying each mode of “SHDW”. A total of 39 signal lines connecting one to three segment electrodes are provided, and each signal line connects to a MOS field effect transistor _Q106 , which is the output end of a level conversion circuit (see Fig. 23), which will be described later. _Q107
connected to the connection point of segment drive signal J0~
J38 is applied. On the other hand, the first to third back electrodes RE ₁ to _{RE 3} are connected to MOS field effect transistors Q ₁₀₀ , Q ₁₀₁ , which are output ends of a common signal output circuit (see FIG. 24), which will be described later.
They are connected to the connection points of Q ₁₀₂ , Q ₁₀₃ and Q ₁₀₄ , Q ₁₀₅ , respectively, and are applied with common signals H0 to H2. Note that no signal line is connected to "〓", but this mark is not displayed on the LCD, but is displayed by the light emitting diode D ₁ (see Figure 14) for indicating the completion of charging of the strobe. Therefore, there is no need to connect signal lines for liquid crystal display. Further, the segment electrodes, signal lines, and back electrodes RE ₁ to RE ₃ are made of transparent electrodes, and the photographic information display device 39 is formed in a light-transmitting type. Furthermore, hereinafter, the segment electrode or the display area of the liquid crystal that is colored corresponding to the segment electrode will be simply referred to as a segment.

FIG. 21 shows a detailed electrical circuit diagram of the liquid crystal drive circuit 61. This liquid crystal drive circuit 61
is a circuit that drives the liquid crystal display panel forming the photographic information display device 39 to produce color. JK flip-flop circuits JKF ₀ and JKF ₁ are such that the output terminal Q of the circuit JKF ₀ is connected to the input terminal J of the circuit JKF ₁ , the inverted output terminal of the circuit JKF ₁ is connected to the input terminal J of the circuit JKF ₀ , and the input terminal The power supply voltage Vcc is applied to K, and the clock pulse is applied to the clock input terminal T.
CK is applied to each circuit to form a known synchronous ternary counter, and each circuit JKF ₀ , JKF ₁
The outputs A0 and A1 are as shown in 25b and 25c, respectively. Also, JK flip-flop circuit
JKF ₂ has an input terminal J connected to the output terminal Q of the above JK flip-flop circuit JKF ₁ , an input terminal K connected to the output terminal Q of the above circuit JKF ₁ via a knot circuit G ₁₉₉ , and a clock input terminal A D-type flip-flop circuit is formed by applying a clock pulse CK to T. This D-type flip-flop circuit is the output of the JK flip-flop circuit _JLKF1 .
This circuit delays A1 by one period of the clock pulse CK, and its output A2 is as shown in FIG. 25d. In addition, JK flip-flop circuit JKF ₃
The power supply voltage Vcc is applied to the input terminals J and K, respectively, and the clock input terminal T is connected to the output terminal Q of the JK flip-flop circuit _JKF2 to form a binary counter, whose output A3 is 2
As shown in Figure 5 e, the output A2 of circuit JKF ₂ is halved.
The frequency is divided into .

The display RAM (DRAM) 85 is a memory that is directly accessed by the CPU 50 through an address bus and a data bus.
There is a one-to-one correspondence between each memory area and the display segment of the photographing information display device 39. Since the photographing information display device 39 has 102 display segments, 102 memory areas SEG ₀ to SEG ₁₀₁ are secured in the DRAM 85 and these memory areas SEG ₀ to SEG 101 are reserved.
The contents of TSEG ₁₀₁ are output to the signal synthesis circuit 100 from 102 output terminals.

The signal synthesis circuit 100 outputs 102 signals outputted from the output end of the DRAM 85 to 39 lines by time division in order to drive the photographic information display device 39 at 1/3 duty and 1/3 bias. signal
This is a circuit for outputting as K0 to K38. 1/3
By adopting the duty/1/3 bias driving method, the number of connection lines between the photographing information display device 39 and the liquid crystal drive circuit 61 is reduced.
As part of this signal synthesis circuit 100 is shown in FIG. 22, in principle, one unit is four NAND circuits and one exclusive OR circuit, and a plurality of these circuits are provided. There is.
For example, one input terminal of the NAND circuit G ₂₀₀ is applied with the output A2 of the JK flip-flop circuit JKF ₂ , and the other input terminal is applied with a signal corresponding to the contents of the memory area SEG ₀ from the DRAM 85. There is. Furthermore, the output A1 of the above JK flip-flop circuit JKF ₁ is applied to one input terminal of the NAND circuit G ₂₀₁ , and the other input terminal is
A signal corresponding to the contents of memory area SEG ₁ is applied from DRAM 85. Furthermore, the NAND circuit
The output A0 of the above JK flip-flop circuit JKF ₀ is applied to one input terminal of G ₂₀₂ , and the other input terminal is connected to the memory area SEG ₂ from the DRAM 85.
A signal corresponding to the content of is applied. The output end of each NAND circuit G ₂₀₀ , G ₂₀₁ , G ₂₀₂ is connected to each input end of a 3-input NAND circuit G ₂₀₉ , and the output end of the NAND circuit G ₂₀₉ is connected to one side of the exclusive OR circuit G ₂₁₂ . Connected to the input end. The other input terminal of the exclusive OR circuit G ₂₁₂ is connected to the output of the JK flip-flop circuit JKF ₃ .
A3 is applied, and the signal K0 is output from the output terminal of the exclusive OR circuit _G212 . This signal K0 is a signal that time-divides the signal output from the output end of the DRAM 85 into 1/3, as shown in FIG. 25i, for example. Similarly, NAND circuit G ₂₀₃ ~ G ₂₀₅ , 3-input NAND circuit G ₂₁₀ and exclusive OR circuit
G ₂₁₃ allows DRAM85 memory area SEG ₃
~The signal corresponding to the contents of SEG ₅ is time-divided into 1/3 and output as signal K1, and the NAND circuit G ₂₀₆ ~
G ₂₀₈ , 3-input NAND circuit G ₂₁₁ and exclusive OR circuit G ₂₁₄ generate signals corresponding to the contents of memory areas SEG ₆ to _{SEG 8} of DRAM 85.
The signal is time-divided into 1/3 and output as signal K2. In this way, signals corresponding to the contents of the DRAM 85 and the 102 memory areas SEG ₀ to _{SEG 101} are output as a total of 39 signals K0 to K38. The signals K0 to K38 are converted into segment drive signals J0 to J38, respectively, through the level conversion circuit shown in FIG. 23, and applied to display segments of the photographic information display device 39. FIG. 25j shows the waveform of signal J0 as an example of the segment drive signal. The above level conversion circuit includes a knot circuit G ₂₂₅ , a P channel MOS field effect transistor Q ₁₀₆ and an n channel MOS field effect transistor.
Consists of Q ₁₀₇ . The above signal Kn (n=0 to 38) is applied to the input terminal of the NOT circuit G ₂₂₅ , and the output terminal of the NOT circuit G ₂₂₅ is connected to the transistor.
Connected to the gates of Q ₁₀₆ and Q ₁₀₇ , respectively.
A constant voltage V ₀ is applied to the source of the transistor Q ₁₀₆ , and a constant potential of −V ₀ is applied to the source of the transistor Q ₁₀₇ . Also, transistor Q ₁₀₆ and
_Q107 and the drain are connected to each other, and the segment drive signal Jn (n=0 to 38) is extracted from this connection point. It goes without saying that the number of such Rennel conversion circuits is equal to the number of segment drive signals J0 to J38, that is, 39.

FIG. 24 shows a common signal output circuit in the liquid crystal drive circuit 61. This common signal output circuit includes NOT circuits G ₂₁₅ , G ₂₂₂ to _{G 224} , NAND circuits G ₂₁₆ to _{G 221} , P-channel MOS field effect transistors Q ₁₀₀ , G ₁₀₂ , Q ₁₀₄ , and an N-channel MOS field effect transistor. effect transistor Q ₁₀₁ ,
It consists of Q ₁₀₃ , Q ₁₀₅ and resistors R ₂₀₀ to _{R 202} . The output A3 of the JK flip-flop circuit JKF ₃ is applied to one input terminal of the NAND circuit G ₂₁₆ , and the output A0 of the JK flip-flop circuit JKF ₀ is applied to the other input terminal. and,
The output end of the NAND circuit G ₂₁₆ is a P channel MOS
connected to the gate of a type field effect transistor Q ₁₀₀ . Furthermore, the inverted signal of the output A3 is applied to one input terminal of the NAND circuit G ₂₁₇ through the NOT circuit G ₂₁₅ , and the output A0 is applied to the other input terminal. The output terminal of the NAND circuit _G217 is connected to the gate of the n-channel MOS field effect transistor _Q101 through the NAND circuit _G222 . The above transistor
A constant voltage +2V ₀ is applied to the source of Q ₁₀₀ , and a constant potential of -2V ₀ is applied to the source of the transistor Q ₁₀₁ . And transistor Q ₁₀₀ ,
The drains of Q ₁₀₁ are connected together and this connection point is grounded through a resistor R ₂₀₀ . 1st
The common signal H0 of transistors Q ₁₀₀ , Q ₁₀₁
It is designed to be extracted from the connection point of the drain. Also, in a similar manner, the circuit that outputs the second common signal H1 is a NAND circuit G ₂₁₈ ,
G ₂₁₉ , knot circuit GP ₂₂₃ , transistor Q ₁₀₂ ,
The circuit consisting of Q ₁₀₃ and resistor R ₂₀₁ and outputting the third common signal H2 is a NAND circuit G ₂₂₀ ,
G ₂₂₁ , knot circuit G ₂₂₄ , transistor Q ₁₀₄ ,
Consists of Q ₁₀₅ and resistor R ₂₀₂ . 1st above
The waveforms of the first to third common signals H0 to H2 are as shown in FIG. 25 f to h.

Next, the operation of the liquid crystal drive circuit 61 is explained in FIG.
This will be explained with reference to the time charts of ~m.
As an example, segments SEG ₀ , SEG ₁ , SEG ₂ (hereinafter, memory areas SEG ₀ to SEG ₁₀₁ of DRAM85)
The display segment corresponding to is indicated by the same reference numeral as that of the memory area. ), we will explain the operation when segments SEG ₀ and SEG ₂ are colored and segment SEG ₁ is not colored. Since the segments SEG ₀ and SEG ₂ are now colored, the content of the corresponding memory area of the DRAM 85 is '1'. On the other hand, the content of the memory area corresponding to segment SEG ₁ is '0'. Outputs A2, A1, A0 are located in memory area SEG ₀ ,
It serves as a gate signal for sequentially outputting signals corresponding to the contents of SEG ₁ and SEG ₂ to the output end of the NAND circuit G ₂₀₉ (see FIGS. 25b, c, and d). The output of NAND circuit G ₂₀₉ is output A3 (see Figure 25e)
is exclusive-ORed and output as a signal K0 from the output terminal of the circuit _G212 (see FIG. 25i). Signal K0 is common signal H00H2 (25th
(see Figures f, g, h) is at 'H' level, if the output of NAND circuit G ₂₀₉ is 'H' level, it becomes 'L' level, and the output of NAND circuit G ₂₀₉ is 'L' level. If the level is high, it becomes 'H' level. Furthermore, during the period in which any of the common signals H0 to H2 is at the 'L' level, the signal K0 becomes 'H' level if the output of the NAND circuit G ₂₀₉ is at the 'H' level, and the output of the NAND circuit G ₂₀₉ is at the 'H' level. If it is 'L' level, it becomes 'L' level. As a result, the output of NAND circuit G ₂₀₉ becomes '
At H' level, the potential difference between segment drive signal J0 and common signals H0 to H2, which will be described later, is 3V _0.
As a result, the liquid crystal corresponding to the segment becomes colored. Furthermore, if the output of the NAND circuit G ₂₀₉ is 'L' level, the potential difference between the segment drive signal J0 and the common signals H0 to H2 becomes _V0 , so that
The liquid crystal corresponding to the segment does not produce color. now,
DRAM85 corresponding to segments SEG ₀ and SEG ₂
The content of the memory area is '1' and the segment
Since the content of the memory area of DRAM 85 corresponding to SEG ₁ is '0', the waveform of signal K0 is the 25th one.
The result is as shown in Figure i. Therefore, the segment drive signal J0 after level conversion becomes as shown in FIG. 25j. Therefore, the potential difference H0 to J0 between the common signal H0 and the segment drive signal J0 is as shown in FIG. 25k, and the segment SEG ₀ develops color at 1/3 duty. Also, the potential difference H1 between the common signal H1 and the segment drive signal J0 is
J0 is always V ₀ as shown in Figure 25l,
Segment SEG ₁ does not develop color. Furthermore, the potential difference H between the common signal H2 and the segment drive signal J0
2 to J0 are as shown in FIG. 25m, and segment SEG ₂ develops color at 1/3 duty. Regarding other segments SEG ₃ to SEG ₁₀₁ ,
Color development is controlled in exactly the same way. Note that even if the segments are colored at 1/3 duty as described above, it goes without saying that to the human eye, the colors appear to be colored continuously. Furthermore, the subscripts of the memory areas SEG ₀ to _{SEG 101} are added for explanation purposes and are not directly related to the addresses of the memory areas SEG ₀ to SEG ₁₀₁ .

Here, the correspondence between the display segments and the addresses of the memory area of the DRAM 85 will be briefly explained. As a general rule, point display data directly specifies the address of the memory area of the DRAM 85. For example, it is assumed that the leftmost segment (high-speed seconds indicator) of the segment string for point display corresponds to address 0 of the memory area of the DRAM 85. Each time a segment is moved to the right one by one, the address of the memory area corresponding to that segment increases by one address. Now, if the point display data is '4', by storing '1' in address 4 of the memory area of the DRAM 85, the fifth segment from the leftmost end of the point display segment string will be displayed in color. become. This address is specified by
The camera 10 of the present invention can be set arbitrarily.
Now, as you can see from the program described below, in the point display segment string, the leftmost segment corresponding to the upper part of the "OVER" segment is placed in the memory area at address C41, and the rightmost segment corresponding to the upper part of the "LONG" segment is placed in the memory area. Segment C40 (=C41
+35) is specified as the address. In addition, in the program described later, the point display data and bar display data are calculated using the same calculation formula.
If you display the address as it is specified, it will be duplicated. In the case of bar display, this problem can be solved by adding a constant to the display data and shifting the address specification of the memory area of DRAM 85, but the addition of the constant is not specifically specified in the program. .

FIG. 26 is a graph showing a method of counting shutter seconds when performing memory photography. In reality, this is done by software inside the CPU 50, and will be explained in detail later.
First, I will briefly explain the overview. Memory mode counts the actual exposure time taken using direct metering and controls exposure based on this. However, since the exposure is memorized, it is possible to change the aperture or film sensitivity while shooting in memory mode. In this case, it is necessary to change the stored value accordingly so that the exposure amount remains constant. In this case, the aperture value and film sensitivity value are
In the camera 10 of the present invention, the information is logarithmically compressed with an accuracy of 1/12 Ev (Least Significant Bit, LSB), so the actual exposure time is also converted into numerical values in the same series as the aperture value and film sensitivity value. There is a need to. The method for this is (1) After counting the actual exposure time using pulses of the same period,
How to convert to LSB1/12Ev Tv value with CPU50,
(2) Two methods: changing the pulse period of the clock, which is the reference for counting, over time so that the count value itself becomes a value equivalent to the time value of LSB1/12Ev (hereinafter referred to as Tv value). is possible. The camera 10 of the present invention employs the latter method.
In order to precisely convert the actual exposure time into a Tv value, controlling the clock frequency becomes extremely complex. For this reason, the camera 10 of the present invention is controlled so that the clock cycle also doubles each time the exposure time doubles. FIG. 26 shows an ideal curve A for converting actual exposure time to Tv value and the camera 10 of the present invention.
According to the method adopted by the camera 10 of the present invention, the error from the ideal curve A is about 0.08 Ev at most, including the quantization error. However, it is possible to demonstrate sufficient accuracy as a camera.

The digital exposure information introduction circuit 60 shown in FIG. 5 is a circuit that inputs the manual shutter time and correction value CV into the CPU 50 as digital quantities, but it can be easily implemented using already well-known circuit means. Therefore, detailed explanation and illustrations will be omitted. In addition, the reference voltage circuit 6
Similarly, detailed explanation and illustration of 9 will be omitted.

The camera 10 of the present invention is configured as described above.

Next, before entering into a description of the operation of this camera 10, the photographing mode of the camera 10 of the present invention will be briefly outlined. First, the shooting modes of the camera 10 are auto mode and manual mode.
There are three basic shooting modes: off mode and off mode. The auto mode is a so-called automatic exposure shooting mode that automatically determines the shutter speed by metering the brightness of the subject, and can be selected by making the shooting mode switching operation knob 21 correspond to the "AUTO" index. be done. This auto mode is further divided into average direct auto mode, spot auto mode, and strobe auto mode.
Average direct auto mode is a shooting mode that automatically closes the shutter when the correct exposure is achieved by averaging the subject light reflected from the film surface and shutter curtain surface during exposure. The above memory command operation knob 13
The memory mode can be selected by associating the index with the "MEMORY" index.
When this memory mode is selected, the shutter speed at the time of shooting the first frame after selection is stored in the camera 10, and from then on the memory command operation knob 13
Unless the memory mode is cleared by making the index correspond to the "CLEAR" index, all frames will be shot at the same exposure level.
In addition, the above-mentioned spot auto mode is a shooting mode in which spot photometry is performed on multiple subject parts before shooting, and the shutter is automatically operated to obtain the appropriate exposure using the average value of the brightness values of each subject part. By pressing the spot input button 14 in the auto mode, the spot auto mode is selected and at the same time the spot photometric values are input and stored. In addition,
As the spot photometry value, the photometry value of the subject part reflected on the spot photometry index (not shown) provided in the viewfinder so as to optically correspond to the photovoltaic element PD ₂ for partial photometry is input. be done. In this spot auto mode, by pressing the highlight command button 15 or the shadow command button 16, it is possible to further select a highlight mode or a shadow mode. In highlight mode, the shutter speed is determined and exposure control is performed so that the exposure is lowered by 2 1/3 Ev from the maximum luminance spot metering value among multiple spot metering values. It is done. In addition, in the case of shadow mode, the shutter speed is determined so that the exposure is 2 2/3 Ev higher than the minimum luminance spot photometric value among multiple spot photometric values, and shooting is performed. . Furthermore, the strobe auto mode is selected when a strobe is attached to the strobe mounting shoe 24 or connected to the connection connector 25 in the auto mode, and the strobe is turned on. mode and the shutter is in strobe synchronization time 1/
It is activated in 60 seconds and the flash automatically adjusts at the correct exposure.

The manual mode is a shooting mode in which the shutter is operated at the shutter speed set by the manual shutter speed setting ring 7, and the shooting mode switching operation knob 21 is set to correspond to the "MANUAL" index. selected by This manual mode is divided into a normal manual mode, a spot manual mode, and a stroke manual mode. but,
These three modes differ only in the manner of display on the photographic information display device 39, but are the same in that the shutter is operated at the manual shutter speed. Note that the memory mode cannot be selected in the manual mode, and the highlight mode and shadow mode can be selected in the spot manual mode.

The above-mentioned OFF mode is a shooting mode that is selected by making the shooting mode switching operation knob 21 correspond to the "OFF" index, and the subject light is measured using average direct metering, and the shutter speed is set from 1/40 seconds. If it is shorter, the shutter will be closed at that shutter time, and if it is longer than 1/40 second, the shutter will be forcibly closed at 1/40 second.

Next, the operation of the camera 10 and the flow of the program in the CPU 50 will be outlined with reference to the flowchart in FIG. First, when the camera 10 is powered on, the CPU 50 and the interface are reset to the initial state, and then a branch is made to a predetermined program depending on the shooting mode of the camera 10. First, camera 10
If it is in direct auto mode, it is determined whether it is auto or not.
Then, the determination as to whether the strobe power is on or not is NO (hereinafter, the branching direction of NO is indicated by N in the flowchart), and the determination as to whether or not the spot mode is in the spot mode is NO, respectively. Enter the program for direct auto mode. It is assumed that the memory mode is not currently selected. In this program, it is first determined whether or not the mode has just been changed. If the mode has just been changed, the display in the finder, the interface, and the internal register of the CPU 50 are reset. Next, the average brightness value (hereinafter, the brightness value will be referred to as the Bv value) by open metering, (film sensitivity value -
aperture value) (hereinafter referred to as Sv-Av value)
and a correction value (hereinafter referred to as Cv value) are input in sequence, and thereafter it is determined whether or not memory hold is being performed. Memory hold is a state in which the actual exposure time using direct metering has already been memorized.It is a state in which the actual exposure time is already memorized using the same memory mode, but the memory set state is simply that the memory mode has been selected and the actual exposure time has not been memorized. distinguished. If it is in the memory hold state, the average Bv value etc. used to calculate the Tv value is changed to the one already held, and then the Tv value is calculated.
When the calculation of the Tv value is completed, this Tv value is displayed as a bar (see Fig. 45). Then, it is determined whether or not the shutter has been released, and if the shutter has not been released,
- to return to the beginning of the flowchart and repeat the loop until the shutter is released. Therefore, the latest appropriate shutter speed (Tv value) is always displayed as a bar on the photographing information display device 39. When the shutter is released, a loop is made to determine whether the trigger is open or not, and the camera waits until the exposure starts. When the trigger is opened, unless it is in memory mode, the shutter is released when the integral output from direct metering reaches a predetermined level. closes to end the exposure. Furthermore, if the mode is memory mode and not memory hold, the actual exposure time is counted at the same time. Furthermore, if the camera is in memory mode and memory hold, the shutter speed is controlled based on the already stored Tv value. Then, the exposure end word returns to the beginning of the flowchart through -, and the display for the next photograph is repeated.

Also, if the camera 10 is in spot auto mode, the determination as to whether the camera is in auto mode is YES, the determination as to whether the strobe power is on is NO, and the determination as to whether or not it is in spot mode is determined as YES. Exit each judgment with a yes and enter the program for spot auto mode. In this program, it is first determined whether or not there is a spot input, but since there is always a spot input when the spot mode is selected, first enter a program with spot input in the spot auto mode, and then , a judgment is made as to whether or not the mode has just been switched. If the mode has just been switched, the display in the viewfinder, the interface, and the CPU 50
The internal registers are reset. Next, the spot Bv value and Sv-Av value obtained by open metering are input in sequence, and after calculating the Tv value, this value is
The Tv value is stored and displayed in points (see Figure 48). Next, it is determined whether it is highlight mode or shadow mode, and if it is not in these modes, the Cv value is input, correction is taken into account, the simple average of the Tv values is calculated, and this is Display the bar (see Figure 50). Here, in the point display of the Tv value, the Cv value is not added, but in the bar display, it is taken into account because the point display is basically to display the subject brightness, but in reality it also shows the subject brightness at the time of spot input. This is because the appropriate level of Tv value conversion is displayed.On the other hand, since the bar display is the actual exposure time level, it is displayed with correction taken into account. After the bar of the average value is displayed, a determination is made as to whether or not the shutter has been released. If the shutter has not been released, the process returns to the mode determination program via -, and a determination is again made as to whether or not there is a spot input. In the second loop after spot input, the spot input state has been canceled in the first loop, so the program enters a program without spot input. Here, first, the Sv-Av value is input, the Tv value is calculated based on the plurality of stored spot Bv values, and the point display of each Tv value is changed. That is, since the storage by the spot input operation is only the storage of the exposure amount, the input points are changed so that the exposure amount remains constant. Next, it is determined whether the mode is highlight mode or shadow mode, and if it is not in these modes, after entering the Cv value,
A simple average of the Tv values is calculated with correction taken into account, and this average value is displayed as a bar (see Figure 50). continue,
Input the spot Bv value currently being metered, convert this Bv value to a Tv value that gives the correct exposure, and display the point. This point display is performed by blinking and is distinguished from the Tv value based on the Bv value that has already been input. Next, it is determined whether or not it is a memory hold, and if it is a memory hold, it is judged whether or not it is a release, and if not, it is determined whether or not it is a highlight mode or not, and whether it is a shadow mode or not. enter into the judgment. If the mode is neither highlight mode nor shadow mode, the determination as to whether or not it is release mode is skipped.

Next, we will discuss the case where the spot auto mode is in the highlight mode or the shadow mode. Now, spot input operation is performed and Tv
Suppose that the point display of the value has finished. Next, if the mode is the highlight mode or the shadow mode, the bar display is not changed, and the program branches again to the mode discrimination program based on the determination of the shutter release. Then, when it comes to determining spot input again,
Now enter the program without spot input,
The point display is shifted so that the exposure amount is constant, and then a highlight mode or shadow mode is determined. now,
Since the mode is highlight mode or shadow mode, the bar display is not shifted, and after point display of the current photometric value is performed, if it is not memory hold, then it is determined whether or not the mode is highlight mode. If it is in highlight mode, it will exceed the highest brightness value of the multiple brightness values stored by the spot input operation by 21/3Ev.
Display the Tv value as a bar (see Figure 52). When displaying this bar, the tip of the bar display is set at
Once it reaches the Tv value corresponding to the highest brightness value (5th
(See Figure 1), and then stops over 2 1/3 Ev from that point (See Figure 52). On the other hand, if
In the shadow mode, the Tv value that is 2 2/3 Ev below the lowest luminance value among the plurality of luminance values stored by the spot input operation is displayed as a bar (see FIG. 56). Even in this case, the tip of the bar display once returns to the Tv value corresponding to the lowest luminance value (see Figure 55), and then from that point 2 2/3Ev
Stop on the underside (see Figure 56).

Then, in spot auto mode, when the shutter is released, it loops to determine whether the trigger has opened or not and waits until the exposure starts, and when the trigger opens, the bar set on the timer counter Exposure time is measured based on exposure time information corresponding to display information. Then, when the value of this timer counter reaches a predetermined value,
The shutter closes and the exposure ends. After this,
- to return to the mode discrimination program again.

Next, the case where the direct auto mode is set and the memory mode is set will be explained. Assume that there is no memory hold.
Then, the judgment is YES if it is in auto mode, the judgment is NO if the strobe power is on, the judgment is NO if it is direct auto and memory hold, and the judgment is if it is in spot mode. Exit each with NO and enter the direct auto mode program. Before the release, the Tv value bar is displayed in exactly the same way as in the normal direct auto mode (see FIG. 57). When the shutter is released, after waiting until the trigger opens, the memory hold judgment is passed to NO, and at the same time the actual exposure time in direct auto mode is counted.
Make changes to the apex value. After this, when the exposure is completed, the program branches again to the mode determination program. Here, if the memory mode is not released, the memory hold state is automatically entered.
Note that when the memory hold state is entered, the bar display and the "MEMO" display blink at a low speed (see FIG. 58). This proactively indicates to the photographer that the camera is in the memory mode, reducing the risk of photographing in the wrong mode. Next, if the judgment that the mode is direct auto mode and the memory hold state is YES, the process enters the step of inputting the Sv-Av value and the Cv value without inputting a new average Bv value. Here, the reason why you do not input a new average Bv value is that the memory hold is for storing the exposure amount, so the Bv value has already been input and stored, and the Sv
- This is because only the information about the Av value and Cv value needs to be input. After inputting the Cv value, it is determined whether or not it is memory hold. Since it is currently memory hold, the current Sv-Av value and Cv are calculated from the Sv-Av value and Cv value at the time of memory hold by direct photometry. When the value changes, the bar display is changed accordingly. This is because the memory hold does not store the exposure time, but the amount of exposure. Next, when the shutter is released, since it is a memory hold, exposure control is performed based on memory shooting information using a timer counter set to a value corresponding to the bar display information. In other words, photography is performed at the same level of exposure as the direct metering photography before memory hold. Note that the bar display will shift depending on the Cv value, so
The exposure amount can be corrected, and strictly speaking it cannot be said to be an exposure amount memory, but if the bar display does not change in the viewfinder display or actual exposure when correction is applied, it can be mistaken as a malfunction of the camera 10. To prevent this, we have made it possible to make corrections in memory mode as well.

Next, we will discuss memory photography in spot auto mode. In this case, the spot input operation is disabled and the program branches directly to a flow without spot input in spot auto mode. Furthermore, bar display of highlight-based Tv values and bar display of shadow-based Tv values are not performed. The rest of the program flow is almost the same as that described for the spot auto mode above. In this memory hold state in spot mode, the "MEMO" display, input point display, and bar display flash at a slow speed, and the point display of the current photometry value flashes at a faster normal speed. Note that exposure control is performed solely based on bar display data.

Next, strobe photography in auto mode will be explained. When you turn on the flash in auto mode, exposure is automatically controlled using direct metering. First, the program exits with a YES determination on whether or not it is in auto mode, and with a YES determination on whether or not the strobe power is on, and enters the flow for the strobe auto mode. First, it is determined whether or not the mode has just been switched. If it is, the average Bv value, Sv
−Av value and Cv value are each input. Next, the Tv value is apex-calculated from the average Bv value, Sv-Av value, and Cv value. Here, the display in the viewfinder during strobe photography includes the strobe synchronization time "60" and a fixed point index (see FIG. 68). That is, the deviation from the exposure level of shutter speed 1/60 second is displayed in points. Next, it is determined whether the flash photography is overexposed or underexposed, and whether overexposed, underexposed, or appropriate is displayed. This display is carried out for only 2 seconds after the strobe light is emitted, and if it is overexposed, a "+" mark will blink, and if it is underexposed, a "-" mark will blink (see FIGS. 70 and 71). If neither of these is the case, it means that the exposure is appropriate, and the fixed point indicator "▲" blinks (see Figure 73). In addition, during normal operation other than 2 seconds after the strobe light is emitted, the fixed point indicator "▲" is simply displayed continuously.
Next, it is determined whether the shutter release has been released or not. If the shutter release has not been released, the program returns to the mode determination program again. If the shutter release has been released, the program loops to determine whether the trigger is open or not and waits until exposure starts. When the trigger opens, integration using direct metering begins, and the flash fires when the shutter is fully open. Exposure control and strobe control using this direct metering
This is done in hardware as described above.

In the mode determination program, if it is not auto mode, it is next determined whether it is manual mode or not, and if it is not manual mode, it is off mode, so the off mode flow Branch into. In the off mode, all displays in the viewfinder are erased to prevent power consumption, and the mode is returned to the mode determination program through -. When the shutter is released, exposure control is performed by direct photometry within a limited range of maximum exposure time, as described above. This exposure control
This is done not by the CPU 50 program but by hardware.

Next, if the manual mode has been selected, it is then determined whether or not the strobe is powered on. If the strobe is not currently powered on, it is next determined whether or not it is in the spot mode, and if it is not in the spot mode, the program branches to the normal manual mode flow. Here, first, it is determined whether or not the mode has just been switched, and if it is right after,
Initial settings for variables and display are performed.
Next, input the manual data corresponding to the manual setting seconds and display the manual shutter seconds. FIG. 61 shows a state in which the shutter time is set to 1/60 second. Next, the average Bv value, Sv-Av value, and Cv value are each input in sequence, and the deviation amount (hereinafter referred to as deviation) from the standard exposure level from the above manual data, average Bv value, Sv-Av value, and Cv value.
is calculated and displayed as a bar (Fig. 61).
Next, it is determined whether the release has been performed or not.
If the shutter release has not been released, the program returns to mode determination, and if the shutter release has been released, the trigger waits in a loop for determining whether the trigger is open or not until exposure starts.
Then, when the trigger is opened, based on the manual data set in the timer counter,
The exposure time is counted, and when the value of the timer counter reaches a predetermined value, the exposure is terminated and the program branches to the mode discrimination program again.

If the spot mode is selected in the spot mode determination described above, it is the spot manual mode, so the flow branches to the spot manual mode. Here, first, it is determined whether or not a spot input operation has been performed, but since spot inputs are always performed at the same time in the first program flow after selecting the spot mode, the next step is to determine whether or not the spot input operation has been performed immediately after the mode switching. A determination is made. Immediately after mode switching, variables, displays, and interfaces are reset. Next, manual data corresponding to the manual setting seconds are inputted, and the manual shutter seconds are displayed (see the display of "125" in FIG. 63). Next, the spot Bv value and Sv-Av value are input in sequence, and the deviation from the standard exposure level is calculated and stored from the above manual data, Bv value, and Sv-Av value, and this is displayed as a point (point display). (See Figure 63). Next, it is determined whether the mode is highlight mode or shadow mode, and if it is either mode, it is determined whether or not to release directly.
If you are not in either mode, enter the Cv value and
The deviation of the simple average value of the stored spot input values from the standard exposure level is calculated and displayed as a bar (see FIG. 63). Next, it is determined whether or not the camera is released. If it has not been released, the process returns to the mode determination program.
When the spot input determination is reached again, unless the spot mode is canceled during this time, the flow branches to the next flow without spot input. Here, first, input the manual data and display the manual shutter seconds. Next, after entering the Sv−Av value, Sv−Av
The point display is changed so that the exposure amount remains constant according to the amount of change in the value. Next, it is determined whether the mode is highlight mode or shadow mode, and if it is not either, after inputting the Cv value, the exposure amount becomes constant according to the amount of change in Sv-Av value and Cv value. Change the bar display as shown below.
Here, the Cv value is not taken into account in the point display,
The Cv value is taken into consideration in the bar display. this is,
As mentioned in the explanation of auto mode,
Point display is basically a display of subject brightness, but in reality it displays the deviation from the standard exposure level based on the subject brightness at the time of spot input. On the other hand, since the bar display is an indicator of the actual exposure level, the Cv value is taken into account. Next, after inputting the spot Bv value, the deviation from the standard exposure level between this Bv value and the Sv-Av value is displayed in points. Since this display is the display of the current photometry point, it is blinking to distinguish it from the already input point (see FIG. 63). Assuming that the camera is neither in highlight mode nor in shadow mode, next a determination is made as to whether or not the camera has been released, and if it has not been released, the process returns to the mode determination program again. FIG. 64 shows a state in which the deviation of the simple average value of input points is displayed as a bar, and FIG. 65 shows a state in which correction is input.

Next, the case where the highlight mode or shadow mode is selected in the spot manual mode will be described. At present, the spot mode is selected, but when no spot input operation is performed, the point display of the spot input is changed as described above, and then a determination is made as to whether the mode is the highlight mode or the shadow mode. now,
If it is in highlight mode, the bar display is not changed for the simple average of the spot input values, and as described above, after the current metering point is displayed blinking, it is determined whether or not it is in highlight mode. . Since we are currently in highlight mode, a bar is displayed 2 1/3 Ev minus the maximum brightness value of the multi-point input point (see Figure 66).
In this case, in order to inform the photographer which spot input point is the 2 1/3 Ev minus trap, as with the display in auto mode, the tip of the bar display temporarily extends to the highest brightness value, and then displays multiple points. Change the bar display to 2 1/3Ev minus side from the maximum brightness value of the input point. Next, it is determined whether or not the camera has been released, and if the camera has not been released, the program branches again to the mode determination program.

Next, a case where the shadow mode is selected will be described. The blinking display of the current metering point is the same as in highlight mode, so
I will explain the program after that. now,
Since it is in the shadow mode, a bar is displayed that is 2 2/3 Ev more than the lowest luminance value of the multi-point input point (see Fig. 67). In this case, the tip of the bar display temporarily retreats to the lowest luminance value, and then the bar display extends 2 2/3 Ev plus from the lowest luminance value. Next, it is determined whether or not the camera has been released, and if the camera has not been released, the process returns to the mode determination program again.

In spot mode, when the release is released, it is next determined whether or not the trigger is open, and if the trigger is open, the exposure time is measured based on the manual data set in the timer counter, and the timer counter is set to the specified value. End the exposure when the value is reached. After the exposure is completed, the program returns to mode determination.

Next, a case where the strobe is powered on in manual mode will be explained. Now, when the strobe power is turned on and manual strobe photography is performed, it is first determined whether or not the mode has just been switched, and if so, the display is reset. This corresponds to the "MANU" display and the fixed point index display shown in FIG. 73. Next, after inputting manual data, the shutter seconds are displayed. FIG. 73 shows a state where 1/30 second is set as the manual shutter time. Subsequently, the average Bv value, Sv-Av value, and Cv value are input in this order, and the deviation from the standard exposure level is calculated from these values and displayed in points (see Figure 73). Next, it is determined whether the camera is released or not, and if the camera is not released, the program branches to a mode determination program. Note that in auto mode or off mode, in flash photography, the shutter time is all strobe synchronization time, but in manual photography, the shutter is controlled according to the manually set shutter time.

Next, the operation of the camera 10 of the present invention will be explained along with the flow of the program in the CPU 50 with reference to detailed flowcharts shown in FIGS. 28 to 44. First, the power is turned on as shown in FIG. This corresponds to storing a battery having an electromotive force and capacity equal to or higher than the specified voltage in the battery storage chamber of the camera 10. Next, clear the display. This corresponds to setting all the contents of the DRAM 85 to '0'. Also, reset the interface. Here, output port O0~
Outputs a positive pulse to O3, flip-flop circuits for spot mode detection (G ₇ , G ₉ ), flip-flop circuits for spot input detection (G ₁₁ , G ₁₂ ), flip-flop circuits for highlight mode detection (G ₁₅ , G _{16 )} ) and the flip-flop circuits for shadow mode detection (G ₁₉ , G ₂₁ ). This causes each input port I2 to I5 to become '0'. Next, reset the variables. Here, first, the contents of flag M10 (M10) are set to '1'. This flag M10 is a memory hold detection flag, and (M10)=0 indicates a memory hold state. Next, off-mode constant C22 is stored in photography mode detection flag M13. This photography mode detection flag M13 has a constant set according to each photography mode, and is used in pair with the same photography mode detection flag M12 to determine whether or not the photography mode has just been changed. Next, the detection flag immediately after highlight input is set.
Store '0' in M17. The immediately after highlight input detection flag M17 is a flag for determining whether or not the highlight input has just occurred. Next, '0' is stored in the shadow input detection flag M18. This shadow input detection flag M18 is
This is a detection flag indicating whether or not it is immediately after a shadow input.
As mentioned above, when using highlight reference shooting or shadow reference shooting, immediately after that mode is selected, the tip of the bar extends to the highest or lowest brightness value of the input point, and then reaches the predetermined exposure level. Bar display is set. Therefore,
Once highlight mode or shadow mode is selected, shifting the bar display for any subsequent spot input point will be
The bar display is only changed to a predetermined exposure level, but the bar display is not set again to the highest or lowest brightness value. Therefore, it is necessary to determine whether or not the highlight input or shadow input has just been made. The immediately after highlight input detection flag M17 and the immediately after shadow input detection flag M18 are flags for this detection. Next, '1' is stored in the blinking display flag M22. This flashing display flag M22 is a flag for performing a flashing display, and by reversing the sign of this flag M22, the display can be turned on or off, and the flashing display can be performed. There is.

After the initial settings after power-on are performed in this way, it is then determined whether the input port I0 is '1' or not, thereby determining whether or not the auto mode is set. Assuming that I0=1, that is, the auto mode is selected, next a determination is made as to whether or not the input port I13 is '1'. The input port I13 becomes I13=1 when the strobe is powered on, but now suppose that the strobe is not powered on and I13=0. Then, it is next detected whether or not the memory mode detection input port I6 is '1'. This input port I6 becomes I6=1 in memory mode. Assume that no memory mode is selected and I6=0. Next, the content of the memory hold detection flag M10 is set to '1'. This is done to reset the contents of flag M10 since the memory is not currently in the hold state. Subsequently, the display of "MEMO" is cleared. This is done by setting the contents of the memory area of the DRAM 85 corresponding to the "MEMO" segment to '0'. Next, non-memory constant C26 is stored in memory mode detection flag M11. This non-memory constant C26 is a constant described later.
It is a constant with a different value from C20 to C24, C30, and C31. Next, it is determined whether the contents of the flag M11 (M11) are the same as the average direct auto mode constant C21. As mentioned above, there are two types of memory modes: average direct auto memory, which controls exposure using direct metering in auto mode, and spot auto memory, which controls exposure using spot metering in auto mode. In the case of average direct auto memory mode, the memory mode detection flag
M11 has an average direct auto mode constant C21
is stored, and in the case of spot auto memory mode, the memory mode detection flag is set.
Spot auto mode constant C20 is stored in M11. Since neither is present, it is next determined whether the spot mode detection input port I2 is '1'. When in spot mode, I2 = 1, but if it is not currently in spot mode, the shooting mode becomes average direct auto mode, and the program goes through the flow for average direct auto mode shown in Figure 29. branch to. Here, first, the average direct auto mode constant C21 is stored in the shooting mode detection flag M12. Next, it is determined whether the content of the photographing mode detection flag M13 (M13) is the off mode constant C22. This flag
Since the constant C22 is set in M13 when the variables are reset immediately after the power is turned on, if this is the first program flow immediately after the power is turned on, the variables will be reset next. Also,
If (M13) = C22, then the contents of shooting mode detection flags M12 and M13 (M12) and (M13)
It is determined whether or not they are equal to each other,
If (M13) = (M12), it means that the mode has just been changed from another shooting mode to the average direct auto mode, so the variables are reset next. When (M13) = (M12), since this is the flow of the program after the first time after switching to the average direct auto mode, there is no need to reset variables and reset the display, and these resets are not performed. Assume that this is the first program flow after changing to the average direct auto mode. At this time, first, the bar display start point is initialized as a variable reset. This is the bar display start address storage area
This is done by storing in M14 the address of the memory area of the DRAM 85 corresponding to the rightmost end of the bar display segment shown in FIG. 19a. In the bar display immediately after changing the mode, the segment display starts from the rightmost segment, actively notifying the photographer that shooting in the new mode has started, so it is necessary to specify the starting point for this purpose. This is because there is. Next, the display is reset. Here, the “AUTO” segment and “LONG” shown in FIG.
A '1' is stored in the memory area of the DRAM 85 corresponding to each segment of '1' to '2000' and 'OVER', and all memory areas of the other DRAM 85 are set to '0'.

Next, the contents (M12) of the photographing mode detection flag M12 are transferred to the photographing mode detection flag M13, and the photographing mode is stored. For this reason,
In the program flow from the second time onward, (M13) = (M12), and the variables and display are not reset. Next, the content of memory hold detection flag M10 (M10) is '0'.
A determination is made as to whether or not. Since it is not currently in memory hold state, the contents of flag M10 (M10)
is set to '1', therefore, the content of (M10) = 0 is extracted as No (N), and then the average input from input port I7 is stored in the average Bv value storage area M0.
Bv value BV ₁ is stored.

Here, a description will be given of how the average Bv value of the analog signal output from the head amplifier circuit 51 is converted into a digital value. First, the CPU 50 sets the output port O4 to '1' to specify that it is an average Bv value input. Next, set output port O5 to '1' to specify that it is a Bv value input. Incidentally, the relationship between the content of the analog signal S8 to be A-D converted and the signals S3 and S7 output from output ports O4 and O5 is as follows:
is '1', '1', signal S8 is the average Bv value, '1',
Spot Bv value when '0', Sv- when '0', '1'
When the Av value is '0' or '0', signal input is prohibited.
Now, since the signals S3 and S7 are set to '1' and '1', the
-D converted analog signal S8 has an average Bv value.
Before the AD conversion is started, all the inputs of the DA conversion circuit 58 shown in FIG. 17 are '0'. At the start of A-D conversion, the most significant bit is
Only b7 is set to '1', and then the output voltage V _DA of the DA converter circuit 58 and the voltage V _AG of the analog signal S8 to be A-D converted are compared. Now, if V _AG ≧ V _DA , the output of comparator A12 will be '1'.
The CPU 50 then uses the A-D conversion signal input port I7.
If it is '1', the most significant bit b7 is left at '1' and '1' is set in the most significant bit of the register that stores the A/D conversion result. If V _AG
When <V _DA , the most significant bit b7 is set to '0', and the most significant bit of the register that stores the A/D conversion result is also set to '0'. The above operations are performed from b7 to b0
By repeating the process up to the end, a digital value corresponding to the average Bv value is finally stored in the register that stores the A/D conversion result. Then this average
The digital value corresponding to the Bv value is temporarily stored at address M0 via an accumulator (ACC) 79. Note that AD conversion of spot Bv values and Sv-Av values, which will be explained later, is performed in exactly the same manner.

Returning to Figure 29 again, the average Bv value storage area
When the average Bv value is stored in M0, next, it is determined again whether (M10) = 0 or not, and since it is not in the memory hold state, Sv - Av value storage area M1
Store the Sv−Av value SV−AV in . Then, it is determined that (M10) = 0 again, and since it is not in the memory hold state, the Cv value CV is input from the input port I9.
Store in Cv value storage area M2. and,
Determine whether (M2) = 0 or not, and if there is no correction input, (M2) = 0, so '±'
The display of the segment is erased, and when there is a correction input, since (M2)≠0, the '±' segment is displayed. Next, it is determined again whether or not memory hold is being performed by determining (M10)=0. Since it is not currently memory hold, the calculation of the Tv value is then started. First, the average Bv value (M0)
After adding the Sv-Av value (M1), the added value is 1/4. This means that the Bv value and Sv−Av value are LSB1/1
This is because while it is stored with a resolution of 2Ev, it is displayed in units of 1/3Ev. Next, add the Cv value (M2). Since the Cv value is input with a resolution of LSB1/3Ev, there is no need for correction. Next, after level correction is performed by adding a constant C2, this calculation result value is stored in the bar display data storage area M3. Next, there are 34 segments for bar display, and the range that can be displayed is only 11 1/3 Ev, whereas the calculation result value stored in area M3 is approximately 0 to 20 Ev, so It is necessary to judge whether it is within the possible range. Therefore, next, in order to convert the calculation result value (M3) into display data, a data conversion subroutine f{(M3)} is executed.

The subroutine f{(M3)} is a function program for converting the value (M3) into display data, and is specifically shown in a flowchart as shown in FIG. Next, this flowchart will be explained.

Constant C41 corresponds to the “OVER” segment
This is a constant indicating the address of the DRAM85 memory area. When (M3)≦C41, all the Tv values stored in the bar display data storage area M3 are in the over area, so the contents of area M3 are set to C41. Now, if (M3)≦C41 is not satisfied, then the contents (M3) of area M3 and constant C40 are compared. Constant C40 corresponds to “LONG” segment
This is a constant indicating the address of the DRAM85 memory area. When (M3)≧C40, all the Tv values stored in area M3 are in the under range, so the contents (M3) of area M3 are set to C40. If C41
If <(M3)<C40, it means that the Tv value is within the area where a bar can be displayed, and the subroutine f{(M3)} is ended. After this, subroutine f
{(M3)} returns to the original program.

Returning again to the average direct auto mode program in FIG. 29, subroutine f {(M3)}
When this is completed, a next predetermined time delay instruction (interval instruction) is executed, and then a determination is made as to whether the release signal input port I10 is '1'. Here, the role of the interval command is particularly important in memory photography, so we will discuss it in the explanation. Above input port I10
is '1' to indicate that the camera has been released, but if it is not currently released, a bar will be displayed next based on the bar display data (M3).
This bar display is performed in the bar display subroutine shown in FIG. Since the bar display methods vary widely depending on each shooting mode, the bar display subroutine program will be explained after the overall program has been explained, and until then, only the bar display format will be explained. do. Now, when C41<(M3)<C40, a display as shown in FIG. 45 is made. In this case, in the first program flow immediately after changing the mode, the bar display will change color sequentially starting from the rightmost segment, and in Fig. 45, it corresponds to the "15" segment indicating shutter time 1/15 second. Stop at the desired position. In the second and subsequent program flows immediately after the mode change, the bar display starts from the tip of the previous bar display and stops at a predetermined display position. If (M3) = C41, the bar display will extend to the leftmost end, as shown in Figure 46.
Display the “OVER” segment blinking. Also,
When (M3)=C40, as shown in Figure 47,
No bar is displayed, and only the "LONG" segment is displayed blinking.

Next, suppose that the shutter is released during the flow of the average direct auto mode program, the judgment of I10 = 1 passes as YES, and then,
It is determined whether the memory mode detection input port I6 is '1'. Input port I6 is '1'
indicates the memory mode, but since it is assumed that the memory mode is not currently selected, the determination is passed as NO, and then the exposure end signal input port I12 is determined. Input port I12 is the exposure end signal
S13 is the input port, and it is '1' until the trailing curtain holding magnet _MG1 is demagnetized, so the program flow loops with I12 = 1 determination until the end of exposure, and input port I12 is '0'. When the exposure is completed, the judgment I12=1 is passed as no. and,
Next, execute an interval instruction for delay. This interval instruction, for example, stores a numerical value in a register, executes a subtraction instruction by '1', and ends execution when the subtraction instruction reaches a predetermined value. It is necessary to perform photometry after the movable reflection mirror 31 has descended and the photometry optical system has stabilized, but the mirror 31 must be started after the exposure end signal S13, which is the degaussing signal of the trailing curtain holding magnet MG1, reaches the 'L' level. An interval command is necessary because it takes several tens of milliseconds for the photometric optical system to descend completely and for the photometric optical system to stabilize. When this interval command ends, positive pulses are then output to output ports O0 and O1, respectively. This is because when shooting in the spot auto mode or spot manual mode is completed, the mode is automatically switched to the average shooting mode. Then again through - the 28th
Return to the mode discrimination program shown in the figure.

Next, the flow of the program in spot auto mode will be explained. When the camera 10 is in auto mode and the spot input button 14 (see Figure 2) is pressed, the spot input switch _SW8 (see Figure 7) is closed, and the spot mode detection input port I2 of the CPU 50 and The input ports I3 for spot input detection each become '1'. Therefore,
In the auto mode, the spot auto mode is selected and the spot input is made. This spot auto mode is still an auto mode like the above average direct auto mode, so in the mode discrimination program shown in Figure 28, the above average direct auto mode branches through the judgment of I2 = 1. This time, the determination is passed as YES, and it is then determined whether the content of the photographing mode detection flag M13 (M13) is equal to the spot manual mode constant C24. This determination is necessary because the following cases occur due to the configuration of the electric circuit of the camera 10. The manual mode includes a normal manual mode and a spot manual mode. In the spot manual mode, the spot mode detection input port I2 is set to '1', and if auto switch SW ₄ is closed from this state to change to the auto mode, the spot auto mode will be switched directly from the spot manual mode. mode will be changed. Generally, when shooting in spot mode, the frequency of shooting is relatively small compared to the overall shooting frequency, and unless special spot operations are performed, it is appropriate to use average direct auto mode or normal manual mode. Therefore, in the camera 10 of the present invention, when switching from manual mode to auto mode, the mode is switched to average direct auto mode, and when switching from auto mode to manual mode, it is switched to normal manual mode. Immediately after changing from the spot manual mode to the auto mode, the shooting mode detection flag M13 is set to the spot manual mode constant C24 at the beginning of the spot auto mode program (see Figure 35), which will be described later. At this time, output ports O0 and O1 are set to '1'.
_It sends _{a pulse of} . If it is not immediately after the change from the spot manual mode to the auto mode, then a determination is made that (M10)=0. Since it is not currently in the memory hold state, the content of the memory hold detection flag M10 (M10) is '1', and this judgment is passed as NO. Subsequently, a determination is made that I3=1.
Now, input port I3 for spot input detection is '1',
That is, since it is assumed that a spot input has been made, the program branches to the flowchart of the spot auto mode with spot input shown in FIG. 30 through -. Here, first, the spot Bv value _BV2 is stored in the Bv value storage area M0. The method of storing the spot Bv value _BV2 as a digital value in the area M0 after A/D conversion is the same as described in the explanation for storing the average Bv value _BV1 . Next, it is determined whether the spot Bv value (M0) is smaller than a certain set value C1, and if (M0)≧C1, the area M0
Also transfer constant C1 to . Generally, there is a limit to the brightness of a subject that can be measured by a photometry circuit, and weak light is particularly problematic. That is, when the brightness of the subject decreases, the photocurrent decreases, and the leakage current,
This is because errors due to noise and errors due to loss of linearity of the logarithmic compression diode become large. Therefore, although the spot Bv value (M0) is originally a large value indicating low brightness, it becomes a small value, and when exposure control is performed based on this value, there is a risk that a large error will occur. Therefore, when the spot Bv value (M0) is equal to or greater than a certain photometric limit value C1, the spot Bv value (M0) is fixed to that limit value. next,
Store the spot auto mode constant C20 in the shooting mode detection flag M12 to memorize the shooting mode. Next, in the same way as in the average direct auto mode above, determine whether the power has been turned on or the mode has been changed using (M13) = C22 and (M13) = (M12).
If applicable, variable reset, display reset, and interface reset are performed. It should be noted that the determination as to whether or not the contents of the photographing mode detection flag M13 (M13) described above is equal to the spot manual mode constant C24 is as follows.
It goes without saying that you can do what you do here. The above variables, that is, internal registers, are reset, but here we first set the overlap detection flag.
Set the contents of M5 to '1'. In spot mode,
Since the calculation result of the current photometry point is displayed in a high-speed blinking manner, if the display of the current photometry point and the display of the spot input point overlap, the display of the current photometry point will take priority and blink. Display. The overlap detection flag M5 is a detection flag for this purpose. This will be detailed later. Next, highlight input detection flag
Set the contents of M6 to '1'. Also, the content of the shadow input detection flag M7 is set to '1'. Both detection flags M6 and M7 are '1', indicating that the mode is not highlight or shadow mode. Next, the address of the start segment of the bar display is stored in the bar display start address storage area M14. As described above, the start segment of the bar display immediately after the mode change is the rightmost segment. In addition, the spot input data number storage area
Set the contents of M15 to '0'. Area M15 is for counting and storing the number of spot input data. Next, initialize the display.
Here, as shown in Figure 48, "SPOT",
“LONG”, “OVER”, “AUTO” and “1”~
Display each segment of “2000”. Since these displays are essential in the spot auto mode, these displays are made immediately after changing the mode. Next, initialize the interface. Here, a pulse of '1' is output to output ports O2 and O3 to reset the flip-flop circuits for highlight mode detection (G ₁₅ , G ₁₆ ) and the flip-flop circuits for shadow mode detection (G ₁₉ , G ₂₁ ). . Also, '1' is output to output port O9, and shutter control signal S16
Puts the energized standby state.

Next, the spot auto mode constant C20 stored in the shooting mode detection flag M12 is transferred to the shooting mode detection flag M13. This will prevent initial settings from being performed from the next program flow. Subsequently, the contents of the spot input data number storage area M15 are incremented by one.
Next, the spot Bv value _BV2 stored in the Bv value storage area M0 is transferred to the MBN address of the register. Here, N in the MBN address means an address corresponding to the contents of area M15. Next, the Sv−Av value (SV
-AV). Next, the spot Bv value (M0) and the Sv-Av value (M1) are added, the result is 1/4, a constant C2 is added, and the result is stored in the MTN address of the register. Here, the MTN address N means an address corresponding to the contents of area M15. Furthermore, the meaning of the above calculation formula is as described in the explanation of the average direct auto mode. Next, the subroutine f{(MTN)} (fourth
(see Figure 3), converts the calculation result to display data, and stores it again at the MTN address. next,
The Tv value (MTN) of the spot input point is displayed as a point (see Figure 48). At this stage, the bar display and the blinking display of the current photometry point have not yet been performed. Next, output port O1
Outputs a positive pulse to . In spot mode,
Two flip-flop circuits operate: a flip-flop circuit for spot mode detection (G ₇ , G ₉ ) and a flip-flop circuit for spot input detection (G ₁₁ , G ₁₂ ), but when the sequence for spot input is completed, the flip-flop circuit for spot input detection is activated. It is necessary to reset (G ₁₁ , G ₁₂ ) and wait for the spot input state again. output port
This is why a positive pulse is output to _O1 .
Next, it is determined whether the content (M6) of the highlight input detection flag M6 is '-1' and the content (M7) of the shadow input detection flag M7 is '-1'.
It is determined whether or not. If (M6)=-
1 or (M7)=-1, the highlight mode or shadow mode is in effect, and no bar display is performed by averaging the spot input data. I'm not even in highlight mode right now,
If it is not the shadow mode and (M6)≠-1 and (M7)≠-1, then the bar display program based on the average of the spot input data is entered. Here, first, the additive average value _N 〓 ⁿ⁼¹ (MBn)/N of the spot Bv values (MBn) (n=1 to N) obtained by the spot input operation is calculated, and this is added to the bar display data storage area M3. Store in. next,
The correction value Cv value CV is stored in the Cv value storage area M2. Then, it is determined whether or not a correction operation has been performed by determining whether or not the correction value (M2) is '0', and if there is a correction,
The "±" segment is displayed (see FIG. 50), and if there is no correction, the display of the "±" segment is erased (see FIG. 48). Next, the sum of the average value of the spot Bv values (M3), the Sv-Av value (M1), the value 4 (M2), which is the Cv value multiplied by 4, and the constant C3, is calculated by adding the sum of the average value of the spot Bv values (M3), the Sv-Av value (M1), the value 4 (M2) which is 4 times the Cv value, and the constant C3. Store in storage area M8. Here, set the Cv value (M2) to 4
The purpose of doubling and adding them is to equalize the weights of the LSBs. That is, the LSB of Bv value (M3) and Sv−Av value (M1) is 1/12Ev, and the LSB of Cv value (M2) is
Since LSB is 1/3Ev, the Cv value (M2) is multiplied by 4 to match the weight with the Bv value (M3) and the Sv-Av value (M1). Therefore, the contents of area M8 (M8) serve as shutter speed information for exposure control, and after release, a value corresponding to the contents (M8) is set in the timer counter to perform exposure control. This will be detailed later. Next, the Sv−Av value (M1) and the spot
After adding the average value (M3) of the Bv value and reducing it to 1/4, the Cv value (M2) and constant C2 are added and stored in the bar display data storage area M3. Next, execute subroutine f {(M3)} using the contents (M3) of area M3 as a variable, convert the contents (M3) into a Tv value for bar display, and then execute the subroutine for bar display. , the Tv value (M3) is displayed as a bar (see Fig. 48). Here, if the spot input is the first input, the bar display starts from displaying the rightmost segment, and if it is the second or subsequent input, the bar display starts from the segment at the tip of the previous bar display to the segment at the desired position. Moving. If the Tv value (M3) after bar display data conversion is equal to constant C41, the bar display will extend to the leftmost segment and at the same time display the "OVER" segment blinking, as shown in Figure 49. do. Also, Tv after bar display data conversion
When the value (M3) is equal to the constant C40, the bar display disappears and the "LONG" segment is displayed blinking. Note that details of the bar display will be described later.

The bar display ends or the above (M6) = -
1 or (M7)=-1, if the result is YES, then it is determined whether the shutter has been released or not based on the determination I10=1. When not released, the input port
Since I10 is '0', the determination I10=1 is passed through as no, and the program returns to the mode determination program of FIG. 28 through -. When the shutter is released, the exposure control program shown in FIG. 29 is entered through -. This program will be described later.

Next, even in the same spot auto mode,
The flow of the program when no spot input is performed, that is, when I2=1 and I3=0 will be explained. In this case, in the mode discrimination program shown in FIG. 28, the program exits from the determination of I2=1 with a yes, exits the determination of I3=1 with a negative, and branches to the program shown in FIG. 31 through -. Here, first, the Sv-Av value (SV-AV) is stored in the Sv-Av value storage area _M1 . Next, the Cv value Cv is input into the Cv value storage area M2. Since we are not currently in the spot input state, it goes without saying that the spot Bv value will not be input. Then, (M2)=
If there is a correction, a "±" segment is displayed (see FIG. 50), and if there is no correction, the "±" segment is erased (see FIG. 48). Next, all display of spot input data (MTn) (n=1 to N) for display is erased.
This is because the point display of spot input data is a point display of the Tv value obtained from the subject brightness (spot Bv value) immediately after the spot input operation and the Sv - Av value at each point in time.
This is because it is necessary to change the point display according to changes in the −Av value. The spot Bv value from each spot input is stored in each register MBn (n
It was mentioned above that the data are stored in the numbers 1 to 1 (=1 to N).
Next, the Tv value for the spot Bv value stored in register MBn (n = 1 to N) is calculated by 1/4 {(M1)
+(MBn)}+C2 (n=1 to N), and each
Store in each register MTn corresponding to the spot Bv value stored at address MBn. and,
Execute the subroutine f {(MTn)} for the contents of each register MTn (MTn), and calculate the Tv value (MTn).
(n=1 to N) are each converted into display data. Next, Tv value (MTn) after display data conversion
(n=1 to N) are each displayed as a point. Next, it is determined whether the content (M6) of the highlight input detection flag M6 is '-1' and the content (M7) of the shadow input detection flag M7 is '-1'.
It is determined whether or not. If (M6)=-
1 or (M7) = -1, it is highlight mode or shadow mode, so bar display based on the average of spot input data described below is not performed, and spot Bv value input (M0← Jump to step BV2). now,
If neither the highlight mode nor the shadow mode is selected, a bar display program based on the average of the spot input data is entered. First, the spot Bv value (MBn) input as a spot
Calculate the additive average value _N 〓 ⁿ⁼¹ (MBn)/N of (n=1 to N) and store it in the bar display data storage area M3.
Store in. Next, add average value of spot Bv value (M3), Sv-Av value (M1), 4 times Cv value 4
(M2) and constant C3, and store in the shutter seconds storage area M8. The contents of this area M8 (M8) are exposure control data as described above. In addition, from now on, regarding the meaning of the arithmetic expression,
Detailed explanations of those already explained will be omitted. Next, by 1/4 {(M1) + (M3)} + (M2) + C2,
Find the Tv value and store it in the bar display data storage area M3. Next, subroutine f
After converting the contents of area M3 (M3) into display data by executing {(M3)}, a bar is displayed by executing the bar display subroutine.

Next, a program is entered to display the current photometry point blinking. Here, we will explain the calculation of the display data of the current photometry point, the process of giving priority to the display mode of the current photometry point when the blinking display of the current photometry point overlaps with the spot input point, and the process of giving priority to the blinking display of the current photometry point. A process is performed in which the current photometry point is displayed blinking at regular intervals. First, the display data calculation for the current photometry point will be described. at first,
Store the spot Bv value BV ₂ in the Bv value storage area M0. Next, after calculating the Tv value by 1/4 {(M0)+(M1)}+C2, this is stored in the point display data storage area M4. Next, by executing subroutine f{(M4)}, area M4 is
After changing the contents (M4) to display data, store it in area M4 again. When the display of the current photometric point currently displayed as a point is updated, the old point display needs to be erased. That is,
It is necessary to set the contents of the address of the DRAM85 memory area corresponding to the point display to '0'.
However, the display of the current photometry point and the display of the spot input point overlapped, but if the current photometry point was updated and its display position changed, the old current photometry point was displayed as the spot input point. must be left alone. The next step is to create a program for this process. First, it is determined whether the content (M5) of the overlap detection flag M5 is '1' or not, and (M5)≠1
If there is an overlap, display data (M4) of the current metering point that you are about to display.
It is determined whether or not the display data (M5) of the current photometry point currently displayed are the same.
If the data (M4) and (M5) are not equal, the display data (M5) of the current photometry point currently displayed and one of the multiple spot input point data (MTn) (n = 1 to N) Determine if they are not equal. If there is an equal value, the data (M5) is displayed as a point, and if there is no equal value, the data (M5) display is cleared in order to update to a new display. Further, if the above determination (M5)=1 is YES, it means that the first current photometry point is displayed, so there is no need to update it. Next, the display data (M4) of the new current photometry point is transferred to address M5. Next, by determining I10=1, it is determined whether or not the release is released, and when I10=1, the second
9. The program branches to the exposure control program shown in FIG.
Further, when I10≠1, since the camera has not been released, a program is then entered to display the current photometry point blinking. First, the display blinking period constant C50 is stored in the display blinking period storage area M23. Next, the process moves to subroutine WAIT3 for flashing display shown in FIG. 41. this subroutine
In WAIT3, first, the program jumps to subroutine WAIT2 shown in FIG. 40, which inverts the flag M22 for blinking display and counts the blinking cycle.
The program for the delay is executed. The flashing cycle of the display is determined by this subroutine WAIT ₂ and the program execution time in the spot auto mode. First, in the subroutine WAIT2, the contents of the display blinking cycle storage area M23 are decremented one by one and stored in the area M23 again. Next, it is determined whether the content M23 of area M23 is '0' or not, and when (M23)≠0, the content (M23) is set again.
Decrement. Then, when (M23)=0, the determination is YES, and then the sign of the blinking display flag M22 is inverted, and then the process returns. A predetermined delay time is obtained by executing this subroutine WAIT2. this subroutine
After executing WAIT2, in subroutine WAIT3,
Determine whether flag M22 is '1' or not. If yes, display data of the current photometry point (M5)
Displays the point, and if no, clears the data (M5) display. In the next program flow, flag M22 is inverted in subroutine WAIT ₂ , so the displayed point is erased or the erased point is displayed. In this way, the display state is reversed every time the program runs, and the current photometry point is displayed blinking. When the data (M5) is displayed or cleared, the processing of subroutine WAIT3 ends and returns. Here, the display of data (M5) is
'1' in address (M5) of DRAM85 memory area
Clearing the data (M5) means storing the data (M5) in the DRAM85 memory area.
This is to store '0' at the address.

Next, the program shown in FIG. 31 enters the processing program for the highlight mode and shadow mode shown in FIG. 32 through -. First, by determining (M10)=0, it is determined whether or not the memory is in the memory hold state. Since it is not currently a memory hold ((M10)=1), the determination is passed as NO, and then, based on the determination of I4=1, it is determined whether or not there is a highlight input. Currently, there is no highlight input and I4 = 0, so
Next, by determining I5=1, it is determined whether or not there is a shadow input. Since there is no shadow input and I5=0, the highlight input detection flag M6 and the shadow input detection flag M7 are subsequently detected. In highlight or shadow mode, if the highlight input or shadow input is input an even number of times, the mode will be canceled, and when the mode is switched from highlight to shadow or from shadow to highlight, the mode will be canceled when the mode is switched from highlight to shadow or from shadow to highlight. A method is adopted that allows switching to a different mode. The highlight input detection flag M6 and the shadow input detection flag M7 are necessary for this purpose. Now, since it is neither highlight mode nor shadow mode, and (M6)=1 and (M7)=1, next, it is determined whether or not the camera is released by determining I10=1. If the camera has not been released, the program returns to the mode discrimination program shown in FIG. 28 through -. If the camera has been released, the program branches to the exposure control program shown in FIG. 29 through -.

Next, the exposure control program shown in FIG. 29 will be explained. First, the contents of the shutter seconds storage area M8 ( _M8 ) are set in the timer counter. Here, Tv value (M8) is LSB1/12Ev
Since the accuracy is , it is necessary to perform the following approximate conversion on the Tv value (M8) and set it in the timer counter. Now, the contents of area M8
When the Tv value is expressed in decimal notation, it can be expressed as Tv=12(12X+Y+1/12Z)...(1) (X, Y, Z are integers). Therefore, the exposure time T is T=(1/f)2 ^(Tv/12) = (1/f)2 ^12X+Y+1/12Z ...(2) (where f is the frequency of the clock pulse CK) This is approximately expressed as T=(1/f)(1+Z/12)・2 ^12X+Y (3). Therefore, when setting the Tv value (M8) in the timer counter, first divide the Tv value (M8) by 1/12 to find the decimal point (here, 4 bits). Next, set the lowest bit of the timer counter to '1', and then set the 4th decimal point above.
Load the bits by shifting them one bit at a time from the bottom to the top of the timer counter. Therefore, the 5th bit from the lowest bit is always '1'.
is loaded, and the 4 bits below the decimal point are loaded into the lower 4 bits. Next, these 5 bits are further shifted to the upper side by 12X+Y-4 bits. As a result, the Tv value (M8) is loaded so as to satisfy the above equation (3), and the setting of the timer counter is completed. Then I11
= 0, wait until the trigger opens,
When the trigger opens, the input port I11 becomes '1', so next the timer counter is subtracted at a cycle of 1/f to measure the exposure time. Then, when the content of the timer counter becomes '0', the exposure must be finished, so '0' is sent to the output port O9.
Outputs and ends the exposure. Next, after executing the interval command, the process returns to the mode classification program of FIG. 28 through -. To execute the interval command, it takes several tens of milliseconds for the movable reflection mirror 31 to descend after the shutter control signal S16 is output, the trailing curtain holding magnet MG ₁ is demagnetized, and for photometry to become possible again. It is done to create.

Next, the flow of the program when the highlight mode is selected in the spot auto mode will be explained. Now, in the spot auto mode, if there is no spot input but I3 = 0, in this case, in the mode discrimination program shown in Fig. 28, the judgment of I3 = 1 is passed as NO, and the input shown in Fig. 31 is passed through -. Branch to a program for no spot input in spot auto mode. Below, descriptions of programs common to the normal spot auto mode will be omitted. It is now assumed that the flow of the program is progressing and that the display of the spot input points has been changed. That is, in the flow of FIG. 31, it is assumed that the step of displaying points of data (MTn) (n=1 to N) has been completed. Next, (M6)=-1,
By determining (M7) = -1, it is determined whether there is a highlight input or not, and whether there is a shadow input, but at this stage, (M6) = 1,
Since (M7)=1, the normal spot auto mode program is executed and the bar display data (M3) is displayed as a bar. As the program progresses further, the program shown in FIG. 32 is entered through -. Here, first (M10) = 0
Based on the determination, it is determined whether or not memory hold is in effect, but since it is not currently in the memory hold state, the determination is passed as NO, and next, the level of the highlight mode detection input port I4 is detected. Since the highlight is currently being input and I4=1, the decision I4=1 is passed with a yes, and then '1' is stored in the highlight input detection flag M17. This flag M17 is a flag for detecting whether this is the first program execution after selecting the highlight mode. Next, the flip-flop circuit for highlight input detection (G ₁₅ , G ₁₆ )
To reset, a positive pulse is output to output port O2. Subsequently, the contents of the highlight input detection flag M6 are inverted. Now, when (M6)=-1, the highlight mode is activated, and when (M6)=1, the highlight mode is canceled. In other words, the flip-flop circuit for detecting highlight input (G ₁₅ , G ₁₆ )
If it is set an even number of times, (M6) becomes 1 and the highlight mode is canceled, and if it is set an odd number of times, (M6) becomes -1 and the highlight mode is selected. Assume that the highlight mode is selected with (M6)=-1. Next, the "HIGH" segment is displayed (see FIG. 51). continue,
The spot Bv value MBn (n=1
~N), the minimum value MIN (MBn) (n=1~
N) and store it in the shutter seconds storage area M8. Next, it is determined whether the content (M17) of the highlight input detection flag M17 is '1' or not. If (M17) = 1, that is, the first program flow after switching to highlight mode. , the bar display first changes to the minimum value, as described above.
It is necessary to extend to the spot input point corresponding to MIN (MBn) (Figure 51). Next, a program for this processing will be explained. First, the Tv value is calculated by 1/4 {(M1) + (M8)} + (C5) and stored in the bar display data storage area M3. Here, (M1) is Sv−Av value, (M8)
is the minimum value of the spot Bv values input by the spot,
C5 is a constant. Next, after converting the Tv value (M3) into display data by executing subroutine f{(M3)}, the Tv value (M3) is displayed as a bar. Next, an interval instruction is executed. This interval instruction is the Tv above which indicates the highest brightness value (M8).
It serves to create a waiting time after bar display of value (M3) is performed until bar display of shutter seconds that is 2 1/3 Ev over this value (M3) is executed. This is to prevent this from occurring, since if this interval command is not executed, the bar display will extend to the maximum brightness value and then immediately shift to a display of over 2 1/3 Ev, making it difficult to confirm the display. If (M17)=-1, the bar display of the maximum luminance value is not performed and the process moves to the execution of the next instruction. Next, from the point display of the spot input data corresponding to the highest brightness value, 2 1/3
Displays the Ev over bar. First, 1/4
The Tv value is calculated by {(M1)+(M8)}+(M2)+C5+7 and is stored in area M3. here,
The number '7' to be added corresponds to 2 1/3Ev. Further, a correction value (M2) is added to this calculation.
Then, by executing subroutine f{(M3)},
After converting the data (M3) to display data,
The data is stored in area M3 again and the data (M3) is displayed as a bar (see Figure 52). Then (M1)+
4(M2)+(M8)+C6 to find the exposure time in highlight mode and store this in the shutter seconds storage area M8. Here, (M1) is
Sv−Av value, (M2) is Cv value, (M8) is the maximum brightness
The Bv value, C6, is a constant. In the above, when determining the highlight mode detection flag M6, (M6) = -
The explanation is for the case where it is 1, (M6)
If =1, the display of the "HIGH" segment is erased. Subsequently, the immediately after highlight input detection flag M17 is set to '0', and the flag M17 is set to indicate that the program has moved to the highlight mode and the first program flow has ended. Next, set the shadow input detection flag M7 to '1', and
Reset. After that, it is determined whether or not the shutter release is performed by determining I10=1, and -
The program is branched to a predetermined flowchart through or -, respectively, as in the normal spot auto mode.

Next, a case where the shadow mode is selected in the spot auto mode will be explained. A detailed explanation of the same program flow as the normal spot auto mode and highlight mode will be omitted. In the case of the shadow mode in the flowchart of Fig. 32, the judgments of (M10) = 0 and I4 = 1 are passed as no, and I5 = 1.
enter into the judgment. When there is a shadow input, I5 = 1, so next, the detection flag immediately after the shadow input is set.
Store '1' in M18. This flag M18 is
This is a flag for detecting whether or not this is the first program flow after changing to the shadow mode, and '1' indicates that it is the first time. Next, a positive pulse is output to the output port O3 to reset the shadow mode detection flip-flop circuit (G ₁₉ , G ₂₁ ). This results in I5=0.
Subsequently, the sign of the shadow input detection flag M7 is inverted. This is to ensure that the shadow mode is cleared when the shadow mode is selected consecutively an even number of times, as in the case of the highlight mode. In resetting the variables in Figure 30, (M7) = 1, so in the first program flow, (M7) = -1,
The next determination of (M7)=1 is NO. Therefore, the "SHDW" segment is displayed first (see FIG. 55). Subsequently, the minimum brightness value MAX (MBn) (n=1 to N) that has been spot-input is determined. Here, the larger the data (MBn), the smaller the brightness value, so the data (MBn)
The maximum value corresponds to the minimum brightness value. The determined minimum luminance value MAX (MBn) is stored in the shutter time storage area M8. Next, by determining (M18) = 1, it is determined whether this is the first program flow after changing the shadow mode, and since (M18) = 1 for the first program flow,
Next, bar display data corresponding to the minimum brightness value MAX (MBn) is calculated. This is 1/4
It is determined by {(M1)+(M8)}+C5 and stored in the bar display data storage area M3. Here, (M1) is the Sv−Av value, and (M8) is the minimum brightness value.
MAX (MBn) and (M2) are Cv values, and C5 is a constant.
Next, by executing the subroutine f{(M3)}, the data (M3) is converted into bar display data, and then the bar display corresponding to the lowest luminance value MAX (MBn) is performed (see Figure 55). ). Next, an interval instruction is executed, and the purpose of this instruction is the same as described in the explanation of highlight mode. In this way, after switching to shadow mode, 1
In the program flow for the second time, the bar display is once returned to the position corresponding to the spot point display corresponding to the lowest luminance value. In the flow of the program from the second time onward, this display is not necessary, so in this case, the determination of (M18)=1 is passed as NO and the program branches directly to the next program. Next, a program is executed to display a bar 2 2/3 Ev below the lowest luminance value. Here, first, the calculation of the Tv value corresponding to 2 2/3 Ev below the lowest luminance value is 1/4 {(M1) + (M8)} + (M2) +
This is performed by C5-8, and the result is stored in the bar display data storage area M3. here,
(M1) is the Sv−Av value, (M8) is the minimum brightness value MAX
(MBn) and (M2) are Cv values, and C5 is a constant. Further, '8' to be subtracted corresponds to 2 2/3Ev.
Next, after converting the data (M3) into bar display data by executing the subroutine f{(M3)},
The data (M3) is displayed as a bar (see Figure 56). Next, the exposure time information in the shadow mode is obtained using (M1)+(M8)+4(M2)+C6, and this is stored in the shutter time storage area M8. On the other hand, in the determination of (M7) = 1 above,
When the shadow input detection flag M7 is '1',
Since the shadow mode is released, the display of the "SHDW" segment is erased, and the bar display corresponding to the above-mentioned lowest luminance value and the bar display 2 2/3 Ev below this value are not performed. Next, '0' is stored in the shadow input detection flag M18. As a result, in subsequent shadow mode programs, the contents of the flag M18 (M18) will be determined and the bar corresponding to the lowest luminance value will not be displayed. Also, the highlight mode detection flag M6 is reset to '1', and then it is determined whether or not the shutter release is being performed by determining I10=1, and branching to the respective program is made through - or -.

In the highlight and shadow modes above, in the second and subsequent program flows, I4=
0, I5=0. At this time, I4=
1 and I5=1 are passed as no, and then (M6)=-1 and (M7)=-1 are judged.
When (M6)=-1, the highlight mode is selected, so the highlight mode program is executed. Also, (M7)=
When the value is -1, the shadow mode is selected, so the program in the shadow mode is executed. If neither is the case, the process directly skips to the determination of I10=1. Then, by determining I10=1,
A determination is made as to whether or not it is a shutter release, and the program branches to the respective program through - or -.

Next, we will discuss the memory mode. As already mentioned, there are two types of memory modes: direct auto memory mode and spot auto memory mode. First, I will explain the direct auto memory mode.
Now, in the flow of the mode discrimination program shown in Figure 28, after the strobe power is turned on with I13 = 1 in auto mode, the memory mode detection input port
The level of I6 is determined. This input port I6
When memory switch SW ₆ is closed and memory mode is selected, I6=1, so the judgment I6=1
The process exits with a yes, and then the memory hold detection flag M10 is checked. This flag M10
is a flag that is '1' in the memory set state and '0' in the memory hold state. Now, if the memory is set, (M10)=1, so next, area M21 for storing the apex value of the actual exposure time is initialized to '0'. Next, the "MEMO" segment is displayed (see FIG. 57). Subsequently, the memory mode detection flag M11 is determined. This flag M11 is set to shooting mode in memory mode, i.e. direct auto memory mode,
This area is for storing mode constants for spot auto memory mode. Now, flagging
Constant C26 is stored in M11 in the normal auto mode program, so (M11)≠C21,
(M11)≠C20. Here, C21 is the average direct auto mode constant and C20 is the spot auto mode constant. Therefore, next, the level of input port I2 is determined. Now, since I2=0 in average direct auto memory mode, -
The program branches to the average direct auto mode program shown in FIG. Here, first, the average direct auto mode constant C21 is stored in the shooting mode detection flag M12. Hereinafter, only the parts specific to the memory mode will be explained, and the explanation of the parts common to the average direct auto mode will be omitted. In the memory set state, there is no difference from average direct auto mode except that "MEMO" is displayed until release. If the shutter is released now, I10
The determination of =1 is passed with a yes, and the determination of I6=1 is passed with a yes, leading to the determination of (M10)=0.
Since we are currently in the memory set state, (M10)
The determination of I11 = 0 is passed through with a NO result, and then, it is detected whether the trigger is open or not by the determination of I11 = 0. When the trigger opens, the I11 = 0 judgment is passed with a yes, and the actual exposure time is counted.
In this case, exposure control is based on average direct metering. The actual exposure time is counted by executing the actual exposure time counting subroutine shown in FIG. 42. Next, the program of this subroutine will be explained. The outline of the method for counting the actual exposure time has already been explained using FIG. This is done by doubling the period.
By doing this, the final count value itself becomes a value equivalent to an apex value with a weight of LSB1/12Ev. In this subroutine, first, a constant C60 is stored in the reference pulse cycle storage area M32, and '0' is initially set in the reference pulse count number storage area M30. next,
Store the reference pulse period (M32) in area M31. Then, the content (M31) of area M31 is decremented by 1 and stored in area M31, and the decrement is repeated until the content of area M31 becomes '0' based on the determination that (M31)=0. When the contents of area M31 become '0', (M31) =
The determination of 0 is passed as YES, and then the apex calculation value storage area M21 of the actual exposure time and the reference pulse count storage area M30 are each incremented by 1. Next, the level of the exposure end signal input port I12 is detected. If the exposure has not been completed, I12=1, so the determination of I12=0 is passed, and then the determination of (M30)=12 is performed. This judgment is to determine whether 12 pulses have been counted. If the number of pulses is less than 12, the reference pulse period (M32) is returned to area M31.
Return to the program that stores the . Then, when this loop is repeated 12 times and (M30) = 12,
This time, after resetting the reference pulse period (M32) to double, set the count storage area M30 to '0'.
and return to the program that stores the reference pulse period (M32) in area M31 again. The above program is repeated until the exposure by direct metering is completed, and when the exposure is completed, the determination of I12=0 is made YES and the program returns to the program shown in FIG. 29. Therefore, a value corresponding to the apex calculation value of the exposure time is stored in area M21. Next, to indicate that the actual exposure time by average direct auto shooting has been held in memory, '0' is stored in the memory hold detection flag M10, and after executing the interval command, the mode is determined as shown in Figure 28 through -. Return to the program.

1 in the memory hold state that follows
In the second program, as in the memory set, after passing through the determination of I6=1 in FIG. 28 as a yes, the program enters the determination of (M10)=0. This time, M10=0 for memory hold, so exit this judgment with a yes and store the contents of shooting mode detection flag M12 (M12) in memory hold detection flag M11. Currently, Flagg M12 has
Since the average direct auto mode constant C21 is stored, the constant C21 is set in the flag M11. Next, the shutter control signal output port
Set O9 to '1' and shutter control signal S16 to 'H'
level. Next, we enter the judgment of (M11) = C21, but as mentioned above, the content of flag M11 is a constant
Since it is C21, this judgment is passed with YES, and the contents of the shooting mode detection flag M12 in the average direct auto mode program in Fig. 29 are set as the shooting mode detection flag.
Branch to step to transfer to M13. Now, in the memory hold state, M10 = 0, so the following judgment of (M10) = 0 is YES, and the Sv-Av value (SV-AV) is stored in area M19.
Cv value CV is stored in area M20. next,
The Cv value is input based on the judgment of (M2) = 0 (M2)
If ≠0, display “±” segment,
Otherwise, the display of the "±" segment is erased. Next, the judgment of (M10) = 0 is passed again with a yes, and first, the Sv input at the time of memory set is
- Find the difference between the Av value (M1) and the Sv-Av value (M19) input during memory hold, and store this in area M19. Next, the difference between the Cv value (M2) input at memory set and the Cv value (M20) input at memory hold is calculated and stored in area M20. Next, (M21) +
(M19) + 4 (M20) + C40 calculates the exposure time in direct auto memory mode and stores this in the shutter seconds storage area M8.
Here, the meaning of this expression will be explained. As mentioned above, (M21) is the apex calculation value of the actual exposure time by direct photometry. This value includes the Bv value, Sv−Av value, and Cv value,
Therefore, (M21) + (M19) + 4 (M20) + C40 is an arithmetic expression that ensures that even if you change the aperture or film sensitivity, the exposure level will be the same as when shooting with direct metering in the memory set state. Also, 4 (M20)
By adding , it is possible to correct the memory hold, and the reason for this is already mentioned. Then 1/4 {(M0)
+(M1)}+(M2)+C2 for bar display
Performs calculation of Tv value. Here, (M0) is the average Bv value immediately before the shutter is released in the memory set state, and does not change as long as the memory is held. Next, subroutine f
By executing {(M3)}, the calculated value (M3)
The data is exchanged with the bar display data, and then the bar display is performed. In this bar display, the entire bar display blinks (see FIG. 58). next,
The interval instruction to be executed is especially necessary when setting the memory, and its purpose will be described here. The level of the input port I10 is set to '1' when the release signal S0 is input in synchronization with the shutter release, but in reality, the level of the input port I10 is set to '1' when the movable reflection mirror 31 is in an upward transition. ing. Display photometry is performed using the reflected light from the mirror, so if the input average
If the Bv value (M0) is during this mirror rising transition, the display data during memory hold and
The actual exposure time data due to memory hold no longer matches. Therefore, the Bv value held immediately before release must be the value immediately before the mirror rises. Roughly speaking, the program repeats the steps of inputting the average Bv value → determining release → storing the average Bv value data. Start then input port
This problem can be solved by making the time longer than the time it takes for the level of I10 to become '1'. Execution of interval instructions is required for this purpose. Next, when the release is in the average direct auto memory mode, the determination of I10=1 is passed with a yes, and the level of the input port I6 is then determined. Now, in memory mode, I6 = 1, so next we enter the judgment that (M10) = 0, and since it is a memory hold, we exit this judgment with a yes, and then we read the contents of the shutter seconds storage area M8 (M8). Set as a timer counter. The method of setting this timer counter has already been described. Further, since the subsequent programs have already been explained, detailed explanation thereof will be omitted here.

Next, the spot auto memory mode will be explained. Spot auto mode is originally a memory metering mode, and exposure is only performed based on the metering value entered manually, so in principle, spot auto memory mode prevents new metering values from being input. Just make it . First, in the memory set state,
There is no difference in flow from the spot auto mode except that "MEMO" is displayed. “MEMO” above
The display is performed in the same manner as in the case of direct auto memory, so a description thereof will be omitted. In addition, since the spot auto mode constant C20 is set in the memory mode detection flag M11, the determination of (M11)=C20 in the mode discrimination program shown in FIG. Branches to a program without spot input in the spot auto mode shown below. That is, in the spot auto memory mode, spot inputs are ignored. Also, no highlight input or shadow input is detected. That is, in the program shown in FIG. 32, by leaving the determination (M10)=0 as YES, the determinations I4=1 and I5=1 are ignored. Furthermore, the bar display blinks. Everything other than what has been mentioned above is the same as in spot auto mode. Note that the bar display will be explained in detail later.

Next, the case where the strobe is turned on in auto mode will be described. When the strobe power is turned on, the strobe power on signal S14 is
By going to H' level, input port I13 becomes '
It becomes 1'. Therefore, in the mode discrimination program shown in Fig. 28, the judgment I13 = 1 is passed with a yes,
-, the program branches to the strobe auto mode program shown in FIG. Here, first, a positive pulse is output to the output ports O0 to O3,
Reset each corresponding flip-flop circuit of the interface. Next, transfer '1' to memory hold detection flag M10, and
Reset. Next, the flash auto mode constant C30 is stored in the shooting mode detection flag M12. Then (M13)=C22 and (M13)=
(M12) and determines whether the power has just been turned on or not.
Then, it is determined whether or not the mode has just been switched, and if it is just after the power is turned on or the mode has been switched, the display is reset (see FIG. 68).
In this display reset, the "AUTO" segment, the fixed point indicator, and the "60" segment of the strobe synchronization time are displayed, respectively. This is because in the strobe auto mode, the deviation of the photometric value with respect to the strobe synchronization time of 1/60 seconds is displayed as a point in the bar display segment column. Next, the average Bv value BV1 is stored in the Bv value storage area M0.
The Sv-Av value SV is stored in M1 in the Sv-Av value storage area.
- Store the Cv value CV in the Cv value storage area M2. Subsequently, by determining (M2)=0, if there is a correction, the "±" segment is displayed, and if there is no correction, the display of the "±" segment is erased. Next, 1/4 {(M0) +
(M1)}+(M2)+C100 to find the deviation of the photometric value with respect to the shutter time of 1/60 second, and store this in the point display data storage area M4.
Next, by executing subroutine g {(M4)}, the data (M4) is converted into display data, and then this is displayed as a point in the bar display segment column (see FIG. 68). Here, g{(M4)} is a subroutine for setting data outside the display data range to a limit value, and can be considered to be different from the above subroutine f{(M3)} only in limit set values C40 and C41. Therefore, this subroutine g
The detailed flowchart of {(M4)} will be omitted from illustration and explanation. Next, the display blinking period constant C35 is stored in the display blinking period storage area M23. This constant C35 is after flash auto shooting.
This is a constant that determines the cycle of flashing indicators such as underexposure, overexposure, and appropriate exposure. Next, the subroutine WAIT1 program (39th
(see figure) and its execution begins. First, it jumps to subroutine WAIT2, creates an interval according to constant C35, then inverts the blinking display flag M22 and returns to subroutine WAIT1. Subsequently, it is determined whether the flag M22 is ``1'' or not, and when (M22)=1, a level determination and display program for displaying over, under, or proper is executed. First, it is determined whether the input port I14 is ``1'' or not. If I14 = 1, it is overexposed, so a ``+'' segment is displayed (see FIG. 70), and the process returns. Also, I14≠1
If so, it is determined whether the input port I15 is '1'. If I15 = 1, it means underexposure, so display of “-” segment (7th
(see figure 1), then return, and I15≠1
If so, the strobe is appropriate, so the "▲" segment is displayed and the process returns. Then, in the next program flow, subroutine WAIT2
Since the sign of flag M22 is inverted within
(M22)=-1, and the display of the "-" and "+" segments is erased. Furthermore, when I16=1,
Due to the judgment of I16 = 1, the “▲” display is erased,
Return. The above input ports I14, I15, I16 are
It remains '1' for about 2 seconds after the strobe fires, so during this time, depending on the flow of the program,
The display of "-", "+", and "▲" blinks depending on underexposure, overexposure, and appropriate exposure. Further, at times other than 2 seconds after the strobe light is emitted, only "▲" is displayed continuously. 3rd after execution of subroutine WAIT1
Returning to the program shown in Figure 3, I10=
Based on the determination 1, it is determined whether or not the shutter release has been performed. If it has not been released, the program returns directly to the mode determination program shown in Figure 28 through -, and if it has been released, since the shutter control and strobe control are performed by hardware as described above, the program will return to I11 = If the determination is 0, the trigger is released, and the process returns to the mode determination program shown in FIG. 28 through -.

Next, we will discuss manual mode. Now, if the manual mode is selected by setting the photographing mode switching operation knob 21 to the "MANUL" index, the manual switch SW ₃ is closed and the input port I1 becomes "1". Therefore, in the mode discrimination program shown in Figure 28, I0=
Pass the judgment of 1 with a no, pass the judgment of I1=1 with a yes, and enter the judgment of I13=1. Assuming that the strobe power is not turned on, I13=0, and then the level of the spot mode detection input port I2 is judged. Now, the spot mode is not selected either, and if the normal manual mode is selected, I2=0, so the program branches to the flowchart for the normal manual mode shown in FIG. 34 through -. Here, first, '1' is output to output port O9. As a result, the trailing curtain holding magnet MG ₁ is energized,
The second curtain enters the hold waiting state. Next, set the normal manual mode constant to the shooting mode detection flag M12.
C23 is stored. Next, by determining (M13) = C22 and (M13) = (M12), whether it is immediately after the power is turned on or
It is determined whether the mode has just been switched, and if the power has been turned on or the mode has just been switched, variables and displays are reset. First, in resetting the variables, the address of the bar display start point is set in the bar display start address storage area M14. Next, when resetting the display, display “MANU” and fixed point indicators (“+”,
Including “-” indication. ) (see Figure 61).
Subsequently, the content of the shooting mode detection flag M12 (M12) is transferred to the shooting mode detection flag M13.
Next, in areas M0, M1 and M2, the average Bv value
BV1, Sv-Av value SV-AV and Cv value CV are stored respectively. Next, it is determined that (M2) = 0, and when correction is input, "±" is displayed (see Figure 62), and when correction is not input, "±" is displayed. . next,
Clears the display of the manual setting seconds (M8). Note that this display may be cleared immediately before updating the display of the manual setting time (M8), which will be described later. Next, enter the manual setting seconds entered in binary code in area M8. Since the manually set seconds have a weight of LSB1Ev, the content (M8) is tripled and stored in area M8 again in order to convert it to a value of LSB1/3Ev for the next display. Next, display the manually set seconds (M8). FIG. 61 shows a case where the manually set time is set to 1/60 second. That is, segments "1" to "2000" for displaying each shutter second.
The address of the DRAM85 memory area corresponding to
There is a one-to-one correspondence with the manual setting seconds.
Next, calculate the bar display data of the deviation from the standard exposure level (1/60 second shutter speed in Figure 61) using the calculation 1/4 {(M0) + (M1)} + (M2) - (M8).
Execute ±C8 and store this in area M3.
Here, (M0) is the average Bv value, (M1) is Sv−Av
(M2) is the Cv value, (M8) is the manually set time in seconds, and C8 is a constant. Next, subroutine h is executed to convert the calculated value (M3) into display data.
Execute {(M3)}. Here, subroutine h
{(M3)} is a subroutine for limiting the deviation from the standard exposure level to within the display data range when it is outside the display data range, and in the above subroutine f{(M3)}, the limit setting value C40, C41
You can think of only that as being different. Therefore, illustration and explanation of the detailed flowchart of this subroutine h{(M3)} will be omitted. This subroutine h{(M3)} is executed when the deviation (M3) from the standard exposure level is larger than a certain value.
The data (M3) is fixed at that limit value, and when the deviation is smaller than a certain value, the data (M3) is fixed at that limit value. That is, the bar display is the sixth
This is done within the range corresponding to the "+" and "-" segments shown in FIG. Next, I10=
1, it is determined whether or not the shutter release has been released. If the shutter release has not been released, the deviation (M3) bar is displayed, and then the program returns to the mode determination program shown in FIG. 28 through -. Also, when releasing the shutter,
- to enter the exposure control program shown in FIG. Here, the timer counter is first set, and the value set in the counter is the manually set time stored in area M8. In this case, Z in the above equation (3) is '
0', and the timer counter is set using the same calculation as for exposure control during spot auto. The flow of the program below is the same as in spot auto, so the explanation is omitted here.

Next, the case where spot input is performed in manual mode will be explained. When the spot input switch _SW8 is turned on in the manual mode and a spot input is performed, the spot mode detection input port I2 becomes '1'. Therefore, in the mode discrimination program shown in FIG. 28, the decision I2 = 1 that branches toward normal manual mode becomes YES, and then (M13) =
A C20 determination is made. Now, when (M13) = C20, it indicates that the previous shooting mode was the spot auto mode, so in this case, a positive pulse is output to the output ports O0 and O1, and the flip-flop circuit for spot mode detection is activated. ( _G7 , _G9 )
and resets the spot input detection flip-flop circuits (G ₁₁ , G ₁₂ ). As explained in the description of the spot auto mode, this is to prevent the camera from switching to the spot manual mode if the manual mode is directly selected from the spot auto mode. That is, when changing between the basic shooting modes between auto mode and manual mode, the simple auto mode or manual mode is always selected to prevent the camera from switching to spot mode after the change. and,
After the positive pulses are output to the output ports O0 and O1, the mode is returned to the beginning of the mode discrimination program through -, and the mode discrimination is performed again. On the other hand, if the previous photographing mode was not the spot manual mode, the determination of (M13)=C20 is passed as NO, and the level of the input port I3 is then determined. When the spot input switch SW ₈ is closed, the spot manual mode is selected and at the same time the spot input detection flip-flop circuit (G ₁₁ , G ₁₂ ) is also set, so I3 = 1, and the third
In the spot manual mode shown in FIG. 5, the program branches to a program with spot input. Here, first, the spot Bv value BV2 is stored in the Bv value storage area M0. Next, the spot manual mode constant C24 is stored in the photographing mode detection flag M12. Then (M13) = C22 and (M13) = (M12)
Based on this determination, it is determined whether the power has just been turned on or the mode has just been switched.If the power has been turned on or the mode has just been switched, variables, displays, and interfaces are reset, respectively. First, when resetting the display, the overlap detection flag M5 and highlight input detection flag
Store '1' in M6 and shadow input detection flag M7, respectively. Next, the address of the start segment of the bar display is stored in the bar display start address storage area M14. Also, '0' is stored and reset in the spot input data number storage area M16. Next, in resetting the display, "MANU", "SPOT" and fixed point indicators (including "+" and "-" displays) are displayed (see FIG. 63). Next, to reset the interface, a positive pulse is output to output ports O2 and O3, and the flip-flop circuits for highlight input detection (G ₁₅ , G ₁₆ ) and the flip-flop circuits for shadow input detection (G ₁₉ , G _{21 )} are reset. ).

Next, the contents of the photographing mode detection flag M12 (M12) are transferred to the photographing mode detection flag M13. As a result, in the next flow of the same program, (M13) = (M12), so the variable,
Display and interface resets are not performed. Next, the spot input data number storage area M16 is incremented by one. Subsequently, the spot Bv value (M0) and the Sv-Av value SV-AV are stored in register MBN and area M1.
Here, N of register MBN is a value corresponding to the number of spot inputs, that is, a value corresponding to the contents (M16) of area M16, and is ``1'' at the first spot input. Therefore, spot Bv values resulting from multiple spot inputs are stored in separate registers. Next, clear the manual setting seconds (M8) display.
Next, store the manual setting seconds data (I8) set in input port I8 in area M8. Next, the manual setting seconds (M8) is multiplied by 3, the weight is converted, and the data is stored in area M8 again.
Then, the contents of area (M8) are displayed. 6th
In FIG. 3, a case is shown in which the manually set time is set to 1/125 second. Next, calculate the deviation from the standard exposure level (1/125 second shutter speed in Figure 63): 1/4 {(MBN) +
(M1)}-(M8)+C8 and register this
Store on MTN. Here, register MTN
Similarly to the N of the register MBN, N is a value corresponding to the number of spot inputs. Subsequently, the subroutine h {(MTN)} is executed to convert the deviation (MTN) into a display gator, which is then displayed as a point (see FIG. 63).

Next, a bar is displayed based on the average value of the spot input values. If (M6) = -1 or (M7) = -1 in highlight mode or shadow mode, the addition method described below is used. Jump directly to the program for canceling the spot input state (O1←〓) without calculating the average value. Right now, I'm not in highlight mode or shadow mode,
Since (M6) = 1 and (M7) = 1, next, the spot Bv value (MBn) input so far (n = 1 to
The average value _N 〓 ⁿ⁼¹ (MBn)/N of N) is calculated and stored in area M3. Next, area M2
Store the Cv value CV in , and if (M2)≠0, display “±” (see Figure 65), and (M2) =
If it is 0, the "±" display is erased. Next, calculate the deviation of the exposure level obtained by the additive average value (M3) from the standard exposure level 1/4 {(M1) +
(M3)}+(M2)-(M8)+C8 and store this in area M3. Then subroutine h
Execute {(M3)} to convert the calculated value (M3) to bar display data. Then output port O1
A positive pulse is output to reset the spot input detection flip-flop circuit (G ₁₁ , G ₁₂ ) and release the spot input state. continue,
Based on the determination of I10=1, it is determined whether the shutter release is present or not, and if it is not released, the bar of deviation (M3) is displayed (see Fig. 64).
- to return to the mode discrimination program shown in FIG. Also, if it is released, -
Through this, the program branches to the exposure control program shown in FIG. Here, manual setting seconds (M8)
is set in the timer counter, and exposure control is performed based on this value. Then, after finishing the execution of the program already mentioned, the second
Return to the mode discrimination program shown in Figure 8.

Next, in the second and subsequent program flow after selecting spot mode, assuming that spot mode is not canceled and there is no spot input, I2
= 1, I3 = 0, so in the mode determination program shown in Figure 28, the determination of I2 = 1 is YES,
The determination of I3=1 is passed as NO, and the program branches to the spot manual mode program without spot input as shown in FIG. 36 through -. here,
First, in areas M1 and M2, Sv−Av value SV−
Input AV and Cv value CV respectively. Next, determine if (M2) = 0, and if there is a correction, “±”
is displayed, and if there is no correction, the “±” display is erased. Next, erase the manual setting seconds (M8) display. Next, after storing the manual setting time data (I8) in area M8, triple the contents of area M8 (M8) and store it again in area M8.
Store in. Next, manual setting seconds (M8)
is displayed (see Figure 63). Next, Sv−
In order to change the spot input point display due to the change of the Av value, the display of all spot input points (MTn) (n=1 to N) is once erased. next,
Each spot input Bv value (MBn)
Calculate the deviation from the standard exposure level using (n = 1 to N) 1/4 {(MBn) + (M1)} - (M8) + C8 (n =
1 to N) and store them in register MTn(n
= 1 to N). Next, for each deviation (MTn) (n=1 to N), subroutine h
By executing {(MTn)}, these are converted to display data, and the register MTn (n=1
~N). Subsequently, points of each deviation are displayed based on each display data (MTn) (n=1 to N). That is, the point display of the spot input is always changed so that the exposure level is constant. Next, it is determined whether it is highlight mode or shadow mode by determining (M6) = -1 and (M7) = -1. If it is highlight mode or shadow mode, input the spot Bv value (M0← Jump to BV2) program. If neither the highlight mode nor the shadow mode is selected, a program is then entered to display a bar for the standard exposure level including the Cv value for the average value of the spot Bv values input as spots. First, the additive average value _N of the spot Bv values (MBn) (n=1 to N) that are input as spot points is ⁿ⁼¹
Find (MBn)/N and store it in area M3. Next, 1/4 {(M1) + (M3)} + (M2) − (M8)
+C8 calculates the deviation of the standard exposure level from the average value of the spot Bv values input as spots, and stores this in area M3.
Next, the deviation (M3) is converted into display data by executing subroutine h {(M3)}, and then the deviation (M3) is displayed as a bar.

Next, the spot Bv value BV2 is stored in area M0. This is done automatically without any spot input operation, and is the Bv value for displaying the deviation of the current photometry point. continue,
1/ between the previously input Sv-Av value (M1), manual setting seconds data (M8), and constant
4 Perform the calculation {(M0) + (M1)} - (M8) + C8,
Store this in area M4. Next, subroutine h{(M4)} is executed to convert the deviation (M4) into display data. Next, a program is executed to detect an overlap between the point display of the deviation of the current photometry point and the point display of the deviation based on the spot input. The point display of the deviation of the current photometry point and the point display of the deviation by spot input use the same segment column for point display, as in the spot auto mode, so the point display of the deviation of the current photometry point When changing the display, if it overlaps with the deviation point display by spot input, that display must remain; if it does not overlap, it must be erased. The following program detects this overlap. First, it is determined that (M5) = 1, and if the overlap detection flag M5 is '1', this is the first program flow after changing to spot mode, so the deviation of the current photometry point is not displayed. There is no need to worry about overlapping. Therefore, jump directly to the program for transferring point display data (M4) to flag M5 and store the data (M4) in flag M5. Now, in the flow of the program from the second time onwards,
Flag M5 stores the display data of the deviation of the current photometry point obtained in the previous program flow. Therefore, in the program flow from the second time onward, the determination of (M5)=1 is passed as NO, and then the determination of (M4)=(M5) is entered. When (M4) = (M5), it means that there is no change in the display of the deviation of the current photometry point, so a program for direct data transfer (M5←(M4)) is entered. Also, when (M4)≠(M5), it means that the display of the deviation of the current photometry point has changed, so next, the display data (M5) of the deviation of the current photometry point that is currently displayed is changed to the spot input. It is sequentially determined whether the difference is equal to any one of the deviation point display data (MTn) (n=1 to N). And if,
If (MTn) = (M5), display the data (M5) as a point, and (MTn) = (M5).
If there is no such thing, the data (M5) point display will be cleared. Next, the new deviation (M4) of the current photometry point is transferred to flag M5. Next, by determining I10=1, it is determined whether or not the shutter has been released. If the shutter has not been released, in order to display the deviation (M5) of the current photometry point in a blinking manner, the display blinking period constant C50 is transferred to the display blinking period storage area M23, and then the subroutine shown in Fig. 41 is executed. Execute WAIT3. this subroutine
The program flow of WAIT3 and the purpose of the blinking operation were described in detail in the spot auto mode, so they will be omitted here. On the other hand, if the shutter has not been released, the program jumps to the exposure control program shown in FIG. 29 through -, and after execution of this program, returns to the mode discrimination program shown in FIG. 28 through -.

When the execution of the above subroutine WAIT3 is completed, the program then executes the 37th subroutine through -.
Go to the flowchart for highlight mode or shadow mode as shown in the figure. Here, first
By determining I4=1, it is determined whether or not it is a highlight input. Assuming that no highlight input has been made, I4=0, so the determination is passed as no, and next, based on the determination I5=1, it is determined whether or not it is a shadow input. Now, assuming that there is no shadow input, I5=0, so the determination is passed as no, and then it is determined whether the highlight input detection flag M6 is '-1'. If (M6)≠-1, then it is determined whether the shadow input detection flag M7 is '-1'. In highlight input or shadow input, input port I4 or I5 is set to '1', but this is immediately reset to '0' during the first program flow in highlight mode or shadow mode. Put it away. Therefore, the highlight mode state or the shadow mode state is stored and held in an internal flag called a highlight input detection flag M6 or a shadow input detection flag M7. Therefore, flags M6 and M7 are discriminated here. Now, if it is neither highlight mode nor shadow mode, (M6) = 1, (M7) = 1, and it will directly determine I10 = 1 without going through the highlight mode and shadow mode processing program. Then, it is determined whether the shutter is released or not. Assuming that the release is not released, I10 = 0, so
- to return to the mode discrimination program shown in FIG. Also, assuming that it is released,
Since I10=1, the program branches to the exposure control program shown in FIG. 29 through -. Here, manual setting seconds data (M8) is set in the timer counter, and exposure control is performed according to the contents of this timer counter. After the exposure is completed, the program returns to the mode determination program shown in FIG. 28 through -.

Next, the flow of the program when the highlight mode is selected in the spot manual mode will be explained. Assume now that the program has progressed and the point display of the deviation of the current photometry point has been completed, reaching the point shown in FIG. 37. Then I4
=1, the level of input port I4 for detecting highlight input is determined. Assuming that this is the first program flow after selecting the highlight mode, I4 = 1, so the judgment is YES and '1' is stored in the detection flag M17 immediately after the highlight input. Ru. This flag M17 is a flag for detecting whether or not this is the first program flow after the highlight mode is selected. When this flag is '1', it means that this is the first program flow. shows. Next, a positive pulse is output to the output port O2 to reset the highlight input detection flip-flop circuit (G ₁₅ , G ₁₆ ). Subsequently, the sign of the highlight input detection flag M6 is inverted. Now, suppose that highlight switch SW ₉ is closed an odd number of times after or without closing shadow switch SW ₁₀ , flag M6 becomes '-1', and the judgment of (M6) = 1 is determined as no. After that, "HIGH" is displayed. Further, if the highlight switch SW ₉ is closed an even number of times, the flag M6 becomes '1', the process exits with a yes determination of (M6)=1, and the "HIGH" display is subsequently erased. After erasing this "HIGH" display, the program jumps to a program for resetting the highlight input immediately detection flag M17 (M17←0), which will be described later. Right now, highlight switch SW ₉ has been closed an odd number of times.
HIGH" is displayed. Next, find the highest brightness value MIN (MBn) among the spot input values (MBn) (n = 1 to N) and store it in the brightness value storage area M9. Next Then, by determining (M17) = 1, it is determined whether or not this is the first program flow after selecting the highlight mode.
When (M17) = 1, this is the first program flow, so in the same way as described in the spot auto mode, the maximum brightness value MIN
The deviation from the standard exposure level is displayed as a bar corresponding to (MBn). Therefore, 1/4 {(M1) +
(M9)}-(M8)+C9, the deviation from the standard exposure level corresponding to MIN (MBn) is calculated and stored in area M3. Then, the deviation (M3) is converted into bar display data by executing subroutine h {(M3)}, and then this is displayed as a bar. After that, execute the interval instruction, then 1/4 {(M1) + (M9)} + (M2) − (M8) +
By C9+7, 2 from the maximum brightness value MIN (MBn)
The deviation from the standard exposure level corresponding to 1/3 Ev minus side is calculated and the result is stored in area M3. Here, '7' added to the arithmetic expression is
This is data corresponding to 2 1/3Ev. Next, execute the subroutine h {(M3)} and calculate the deviation (M3)
After converting into display data, this is displayed as a bar (see Figure 66). Subsequently, the immediately after highlight input detection flag M17 is reset to '0'. Next, the shadow input detection flag is reset to '1'. Then, it is determined whether or not the release has been performed by determining I10=1. If the release has not been performed, the program returns to the mode determination program shown in FIG. 28 through -, and if it has been released, the Return to the exposure control program in Figure 29. After the exposure control program ends, the program returns to the mode discrimination program shown in FIG. 28 through -. In the flow of the program from the second time onwards in highlight mode, I4 = 0, so the judgment of I4 = 1 is passed as no, and (M6) =
The “HIGH” display program is entered through the determination of -1, and the bar display of the deviation from the standard exposure level corresponding to the maximum brightness value MIN (MBn) is not performed due to the determination of (M17) = 1, and the maximum brightness value Only the bar display of the deviation from the standard exposure level corresponding to 2 1/3 Ev minus the value MIN (MBn) is performed.

Next, the flow of the program when the shadow mode is selected in the spot manual mode will be described. It is now assumed that the flow of the program has progressed to the point display of the deviation of the current photometry point and has reached the point shown in FIG. 37. Then I4
= 1 decision is passed with no, and I5 = 1 decision,
A determination is made as to whether or not it is a shadow input.
Assuming that this is the first program flow after selecting the shadow mode, I5=1, so the determination is YES and ``1'' is stored in the shadow input detection flag M18. This flag M18 is a flag for detecting whether or not this is the first program flow after the shadow mode is selected. When this flag is '1', it indicates that this is the first program flow. . Next, a positive pulse is output to the output port O3 to reset the shadow input detection flip-flop circuit (G ₁₉ , G ₂₁ ). Subsequently, the sign of the shadow input detection flag M7 is inverted. now,
If shadow switch SW ₁₀ is closed an odd number of times after or without closing highlight switch SW ₉ , flag M7 becomes '-1',
After the determination of (M7)=1 is passed as NO, "SHDW" is then displayed (see FIG. 67).
Also, if shadow switch SW ₁₀ is closed an even number of times, flag M7 becomes '1', and (M7) = 1
The determination is passed with a yes, and the "SHDW" display is subsequently erased. After erasing the "SHDW" display, the program jumps to the program for resetting the shadow input detection flag M18 (M18←0), which will be described later. Suppose now that shadow switch SW ₁₀ has been closed an odd number of times and "SHDW" is displayed. Next, spot input value (MBn) (n=1~
Find the lowest brightness value MAX (MBn) of N),
Similarly to the highlight mode, a bar display of the deviation from the standard exposure level is performed corresponding to this minimum brightness value MAX (MBn). Further, a bar display of the deviation from the standard exposure level corresponding to 2 2/3 Ev plus more than the minimum luminance value MAX (MBn) is performed. In the flow of the program from the second time onward in shadow mode, since I5 = 0, the program with "SHDW" display will be entered through the determination of (M7) = -1.
By determining (M18) = 1, the minimum brightness value MAX
The deviation bar from the standard exposure level corresponding to (MBn) is not displayed, and the minimum brightness value is MAX.
(MBn), only the bar display of the deviation from the standard exposure level corresponding to 2 2/3 Ev plus side is performed.

Here, to summarize the program flow of the highlight mode or shadow mode in the spot manual mode described above, first, in mode selection, if the highlight command button 15 is pressed an odd number of times in succession, the highlight mode is selected. , the shadow mode is selected when the shadow command button 16 is pressed an odd number of times in succession. If pressed an even number of times in succession, any mode will be canceled. In addition, in the first flow after selecting the highlight mode, a bar of the deviation from the standard exposure level corresponding to the maximum brightness value of the spot input value is displayed, and then the deviation from the maximum brightness value of the spot input value is displayed.
A bar display of the deviation from the standard exposure level corresponding to 2/3 Ev minus side is performed. In the second and subsequent consecutive flows, only the bar display of the deviation from the standard exposure level corresponding to 2 2/3 Ev minus the maximum brightness value of the spot input amount is performed. In addition, in the first flow after selecting the shadow mode, after displaying a bar of the deviation from the standard exposure level corresponding to the minimum brightness value of the spot input value, 2 2/3 Ev plus from the minimum brightness value of the spot input value is displayed. The deviation from the standard exposure level corresponding to crocodile is displayed as a bar. In the second and subsequent consecutive flows, only the bar display of the deviation from the standard exposure level corresponding to 2 2/3 Ev plus more than the lowest luminance value of the spot input value is performed. When the highlight mode or shadow mode program finishes executing, it is then determined whether the shutter has been released. If the release has not been released, the process returns to the mode determination program. If the release is released, after setting the manual setting seconds (M8) to the timer counter,
Exposure control is performed according to the contents of the timer counter, and then the program returns to mode discrimination.

Next, a strobe photography program in manual mode will be explained. When you attach a strobe in manual mode and turn on the strobe, input port I13 becomes '1'. Therefore, in the mode discrimination program shown in Figure 28, I13
The determination of =1 becomes YES, and the program branches to the strobe manual mode program shown in FIG. 38 through 〓-〓. Here, first, the output port
Positive pulses are output to O0 to O3, and flip-flop circuits (G ₇ , G ₉ ; G ₁₁ , G ₁₂ ; G ₁₅ , G ₁₆ and
G ₁₉ , G ₂₁ ) respectively. Next, the strobe manual mode constant C31 is stored in the shooting mode detection flag M12. Next, (M13)
Based on the determination of =C22 and (M13) = (M12), it is determined whether the power has just been turned on or the mode has just been changed, and if the power has just been turned on or the mode has just been changed, the display is reset. In resetting this display, as shown in Fig. 73,
Displays “MANU” and fixed point indicators excluding “+” and “-”. It should be noted that the display "〓" indicates the completion of strobe charging, and it was already mentioned in the electrical circuit that this is displayed by the light emitted from the light emitting diode _D1 .
If the mode has not just been changed, the above display will not be reset and the next manual setting seconds (M8) display will be erased immediately. Next, the area
Input the manual setting seconds data (I8) into M8. Next, after tripling the data (M8),
Store this again in area M8. Then, this manual setting seconds data (M8) is displayed. FIG. 73 shows a case where the manually set time is set to 1/30 second. Then, in each area M0, M1 and M2, the average
Bv value BV1, Sv-Av value SV-AV and Cv value CV
Enter each. Then 1/4 {(M0) + (M1)}
After calculating the deviation from the standard exposure level using +(M2)-(M8)+C8, this result is stored in area M4. Next, subroutine h
After converting the deviation (M4) into bar display data by executing {(M4)}, this is displayed as a point in the segment column for bar display (see Figure 73).
Next, by determining I10=1, it is determined whether the release is released or not, and if it is not released,
The program returns to the mode discrimination program shown in FIG. 28 through -, and if the release has been released, the program branches to the exposure control program shown in FIG. 29 through -. In the exposure control program, the exposure is controlled based on the manual setting seconds (M8).
After that, the program returns to the mode determination program.

Next, the flow of the off-mode program will be explained. In off mode, it is neither auto mode nor manual mode, so I0≠1, I1
≠1, and in the mode discrimination program shown in FIG. 28, the determinations of I0=1 and I1=1 are respectively passed as NO. Therefore, next, the display is completely erased, and then the off mode constant C22 is stored in the photographing mode detection flag M12. Next, memory hold detection flag M10 is reset to '1', and positive pulses are output to output ports O0 to O3, respectively, for spot mode detection, spot input detection, highlight input detection, and shadow input detection. Each flip-flop circuit (G ₇ ,
G ₉ ; G ₁₁ , G ₁₂ ; G ₁₅ , G ₁₆ and G ₁₉ , G ₂₁ ) are reset. And after that,
- returns to the beginning of the mode determination program and repeats the loop. Note that all shutter control is performed by hardware using electrical circuits.

Next, a subroutine program for bar display shown in FIG. 44 will be explained. In this program, first, the level of input port I6 is determined. If the memory mode is selected, I6=1, and then M10=0 is determined. In memory mode, (M10)
When = 1, memory is set, and when (M10) = 0, memory is held. Assuming that the memory is currently set, "MEMO" will be displayed next. Next, by determining (M3) = C40, it is determined whether the display data (M3) is underexposed data, and if yes, the start address (C40-) is stored in the bar display start address storage area M14. 1) and returns after displaying “LONG”. If (M3)≠C40 and there is no underexposure, then start address storage area
Store constant C55 in M14. Here, constant C55
is a constant that is 1 larger than the address of the bar display start point. By the way, the addresses of the DRAM85 memory area corresponding to the bar display segment column and the "OVER" and "LONG" segments are as follows: If the "OVER" segment is set to address X, the leftmost segment corresponds to address X+1. The number increases by one as you move to the right.
Therefore, the rightmost segment corresponds to address X+34, and the "LONG" segment corresponds to address X+35. The addresses of the DRAM85 memory area corresponding to the segment column for point display are also the same, and if the segment corresponding to "OVER" is designated as Y address, as you move to the right, the DRAM85 memory area corresponding to the segment The address of the area also increases by one, and the rightmost "LONG"
The location of the memory area in DRAM85 of the segment corresponding to is address Y+35.
After storing the constant C55 to area M14 above, 1 is subtracted from the address (M14), and the result is stored in the area again.
Stored in M14. Next, '1' is stored in the memory area at address (M14) of DRAM85. As a result, the segment forming the bar display corresponding to the memory area at address (M14) of DRAM85 becomes colored. Next, by determining (M14) = C41, it is determined whether the address (M14) is the address of the DRAM85 memory area corresponding to the “OVER” segment, and if (M14)≠C41, then the Based on the determination of (M14)=(M3), it is determined whether or not the bar display has ended. When the bar display ends, the program returns directly, and when the bar display does not end, it returns to the address subtraction program (M14←(M14)-1) and returns the address (M14).
The next segment corresponding to the color will be colored. on the other hand,
If (M14) = C41, the bar will be displayed up to the leftmost segment, so next,
A number obtained by adding 1 to the constant C41 is stored in area M14, and after displaying "OVER", the program returns. To summarize the flow of the above program, the bar display will be colored sequentially until the segment corresponding to the bar display data (M3) is shown on the right. However, since this program is executed instantaneously, the human eye perceives it as if the entire bar display were displayed at once.

Next, in the case of memory hold, M10=0
The determination becomes YES, and subsequently, the display blinking period constant C80 is stored in the display blinking period storage area M23. Next, the subroutine shown in FIG.
WAIT2 is executed, a predetermined delay time is created, and the blinking display flag M22 is inverted. Next, by determining (M22) = 1, it is determined whether it is a coloring cycle or an erasing cycle, and if it is a coloring cycle, execution of the program below the "MEMO" display begins. . If it is the erasing cycle, the entire "MEMO" display and the bar display are instantly erased, and then the process returns. In the next program flow of the bar display subroutine, the sign of flag M22 will be reversed, so the erased “MEMO” display and bar display will be colored, or the colored “MEMO” display and bar display will be erased. By repeating this, “MEMO” and the entire bar display will be changed to constant C80 in memory hold.
It will be displayed blinking at a period determined by .

On the other hand, when not in memory mode, I6=0
Therefore, the judgment of I6=1 passes as no, and then,
By determining (M3)<(M14), it is determined whether the data to be displayed (M3) is smaller than the previously displayed data (M14). Assuming that the program flow is for the first bar display after mode conversion, the address of the memory area of the DRAM 85 corresponding to the bar display start segment is stored in area M14 in the initial setting. Therefore, normally (M3)<(M14), and "LONG" is then displayed. Next, 1 is subtracted from the address (M14), and the result is returned to the area.
Stored in M14. Subsequently, '1' is stored in the memory area at address (M14) of the DRAM 85, and as a result, the rightmost segment of the bar display segment row is colored. Next, after executing the interval command, the bar display is performed up to the leftmost segment by determining (M14) = C14,
A determination is made as to whether an "OVER" segment has been displayed. Here, constant C41 indicates the address of the memory area of DRAM 85 corresponding to the "OVER" segment. When (M14)≠C41, then it is determined whether or not the bar display has ended by determining (M14)=(M3). (M14)≠(M3)
Then, '1' is subtracted from the address (M14) again and the result is stored in area M14. Below, run the same program as mentioned above, and when (M14) = C41, "OVER" has been displayed, so the DRAM85 memory corresponding to the bar display start segment for the next bar display will be displayed. Store the area address (C41+1) in area M14.
At this time, it goes without saying that the bar display extends to the leftmost segment. Also, (M4)
When ≠C41, if (M14) = (M3), the bar display ends and the program goes directly to the following program. Here, to summarize the aspect of the bar display, in the first bar display after mode switching, the bar display starts from the rightmost segment and sequentially extends one segment at a time to a predetermined position. The interval command is a delay command so that the movement of the bar display can be confirmed. In the next bar display, the bar display starts moving from the tip of the currently displayed bar display. next,
(M3) = Display data (M3) based on the judgment of C41
Execute the following program to determine whether or not corresponds to overexposure, and if yes, to flash the "OVER" display. First, the blinking period constant C70 is stored in the display blinking period storage area M23. Next, the subroutine shown in FIG.
WAIT2 is executed to create a predetermined delay time and to invert the sign of the blinking display flag M22. Next, determine the contents of flag M22,
When (M22) = 1, “OVER” is displayed,
When M22≠1, the “OVER” display is cleared. Flag each program as it flows.
Since the sign of M22 is reversed, the "OVER" display will blink. Furthermore, when (M3)≠C41, "OVER" is simply displayed continuously.
After the above-mentioned "OVER" is displayed or erased, the program returns.

Next, the flow of the program when (M3)<(M14) is not satisfied will be explained. If (M3) < (M14), then it is determined whether the data to be displayed (M3) is larger than the previously displayed data (M14) by determining (M3) > (M14). Ru. If (M3)>(M14) is not satisfied, the data to be displayed is the same as the data displayed last time, so the process returns directly. Also, (M3)>
(M14), first, the DRAM85 (M14)
Stores '0' in the address memory area and erases the tip segment of the bar display. Next, after executing the interval command, it is determined whether or not the rightmost segment of the bar display has been erased by determining (M14) = C40. If (M14) = C40, the area Store the address (C40-1) of the DRAM85 memory area corresponding to the start segment of the next bar display in M14, and exit to the subsequent program. Also, if (M14)≠C40,
Add '1' to address (M14), store in area M14, and update address (M14). Next, (M14)=
By determining (M3), it is determined whether the tip of the bar display has reached the position corresponding to data (M3), and if (M14)≠(M3), it is determined whether the tip of the bar display has reached the position corresponding to data (M3).
In the memory area of address (M14) of DRAM85'
Store 0' and repeat the program described above. By executing the interval command, a predetermined delay time is created, and the display of the segments constituting the bar display is sequentially erased from the left end at a visible speed, and the predetermined bar display is performed. Next, by determining (M3) = C40, the display data (M3)
It is determined whether or not it corresponds to underexposure, and if it is underexposed, the “LONG” display will flash,
Otherwise, the "LONG" display remains displayed continuously. This program is the same as that for overexposure, so detailed explanation thereof will be omitted. To summarize the form of the bar display, the address of the memory area of the DRAM 85 corresponding to the segment at the tip of the bar display is stored in area M14, and the bar display moves from the tip unless the mode is changed. Immediately after changing the mode, area M14 is initialized and bar display starts from the rightmost segment.

As described above, according to the present invention, the conventional problems mentioned at the beginning of the specification can be solved, various shooting modes can be selected with a simple operation, and the photographer's drawing intention can be fully reflected. It is possible to provide a camera that is extremely convenient to use.

[Brief explanation of the drawing]

FIG. 1 is a front view of a camera showing an embodiment of the present invention, FIG. 2 is a plan view of the camera shown in FIG. 1 above, and FIG. 3 is a front view of the camera shown in FIG. FIG. 4 is a side view of the main parts showing the installed optical system.
A front view of the photometric light receiving device disposed in the optical system shown in Fig. 3 above, and Fig. 5 shows an outline of the configuration of the electric circuit disposed within the camera shown in Fig. 1 above. 6 is a block diagram showing the internal configuration of the microcomputer as the central processing unit shown in FIG. 5 above, and FIG. 7 is a block diagram showing the interface around the microcomputer shown in FIG. 6 above. FIG. 8 is an electric circuit diagram of the head amplifier circuit shown in FIG. 5 above, and FIG. 9 is an electric circuit diagram of the analog exposure information introduction circuit and second selection circuit shown in FIG. 5 above. FIG. 10 is an electrical circuit diagram of the strobe over-under judgment circuit and first comparison circuit shown in FIG. 5 above, and FIG. 11 is an electrical circuit diagram of the power supply hold circuit shown in FIG. 5 above. The electrical circuit diagram, Figure 12, is
FIG. 13 is an electrical circuit diagram of the trigger timing adjustment circuit shown in FIG. 5, FIG. 13 is an electrical circuit diagram of the battery check circuit and power hold release circuit shown in FIG. Electrical circuit diagram of the strobe determination circuit shown in Figure 5, 1st
FIG. 5 shows the first selection circuit shown in FIG.
FIG. 16 is an electric circuit diagram of the magnet drive circuit and strobe control circuit, FIG. 16 is an electric circuit diagram of the timer circuit shown in FIG. 5 above, and FIG. 17 is an electric circuit diagram of the timer circuit shown in FIG.
Electrical circuit diagram of the D-A conversion circuit shown in the figure, 1st
8a to 8i are time charts showing the waveforms of various timer signals output from the timer circuit shown in FIG. 16 above, and FIGS. 19A and B are time charts showing the photographing information display device shown in FIG. 4 above. FIG. 20 is a plan view showing the display segment electrodes and back electrodes of the liquid crystal display board forming the main body of 39, and FIG. 20 shows the correspondence between the display segment electrodes and back electrodes shown in FIGS. 19A and B above. 21 is an electrical circuit diagram of the liquid crystal drive circuit shown in FIG. 6 above, and FIG. 22 is an electrical diagram of the main parts showing the signal synthesis circuit shown in FIG. 21 above. circuit diagram,
FIG. 23 is a main part electric circuit diagram of the level conversion circuit to which the electric circuit shown in FIG. 22 is connected, and the second
4 is an electrical circuit diagram of the common signal output circuit in the liquid crystal drive circuit shown in FIG. 6 above, and FIGS. 25 a to 25 m are various signals in the liquid crystal drive circuit shown in FIGS. 21 to 24 above. 26 is a diagram showing a method for counting shutter seconds in memory mode shooting; FIG. 27 is a flowchart showing an overview of the program in the microcomputer shown in FIG. 6; FIG. 28 is a flowchart showing in detail the mode discrimination program in the flowchart shown in FIG. 27 above, and FIG. 29 is a program for average direct auto shooting mode in the flowchart shown in FIG. 27 above. The flowchart shown in detail in FIG. 30 is the flowchart shown in FIG.
In the flowchart shown in the figure, the detailed flowchart is for the case where spot input is provided in the spot auto shooting mode, and FIG. The detailed flowchart, FIG. 32, is for the highlight reference shooting mode and the shadow reference shooting mode, which are executed following the flowchart for the spot auto shooting mode without spot input shown in FIG. 31 above. FIG. 33 is a flowchart showing in detail the program of the strobe auto shooting mode in the flowchart shown in FIG.
FIG. 4 is a flowchart showing in detail the program in the normal manual shooting mode in the flowchart shown in FIG. 27 above, and FIG. FIG. 36 is a detailed flowchart for the case with input, and FIG. 37 is a detailed flowchart for the spot manual shooting mode without spot input in the flowchart shown in FIG. 27. FIG. 38 is a flowchart showing in detail the program for the highlight standard photography mode and the shadow standard photography mode, which is executed subsequent to the flowchart for the spot manual photography mode without spot input shown in the figure. A flowchart showing in detail the program of the strobe manual shooting mode in the flowchart shown in FIG. 27 above, and FIG. 39 shows a detailed program of subroutine WAIT1 executed in the flowchart shown in FIG. 33 above. The flowchart shown in FIG. 40 is a subroutine executed in the subroutine WAIT1 shown in FIG. 39 above, the subroutine WAIT3 shown in FIG. 41 described later, and the bar display subroutine shown in FIG.
FIG. 41 is a flowchart showing a detailed program of WAIT2, and FIG. 42 is a flowchart showing a detailed program of subroutine WAIT3, which is executed in the flowcharts shown in FIGS. 31 and 36 above. 43 is a flowchart showing a detailed program of a subroutine for counting actual exposure time executed in the flowchart shown in FIG. 29 above, and FIG. FIG. 44 is a flowchart showing a detailed program of subroutine f {(M3)} executed in FIG.
Flowcharts illustrating detailed programs of subroutines for bar display executed in the flowcharts shown in FIGS. 45 to 38, and FIGS. The display modes are shown in Figure 45, when the Tv value bar is displayed within the display range, Figure 46, when the Tv value bar is displayed outside the display range, and Figure 47, when the Tv value bar is displayed outside the display range. Figures 48 to 50, which respectively show the cases where the bar display of the Tv value is under the display range, respectively show the display mode of the shooting information display device in the spot auto shooting mode. Fig. 49 shows the case where the bar display of the average Tv value is within the display range, Fig. 50 shows the case where the bar display of the average Tv value exceeds the display range, and Fig. 50 shows the case where correction is added. 51 to 54 respectively show the display mode of the shooting information display device when the highlight reference shooting mode is selected in the spot auto shooting mode, and in FIG. 51, the bar display of the average Tv value is The state shown in Fig. 52, which extends to the position corresponding to the highest brightness value, is the average value from the state shown in Fig. 51.
Figure 53 shows the state in which the bar display of the Tv value has moved to the minus side by 2 1/3 Ev, and the bar display of the average Tv value has been shifted from the state shown in Figure 52 by changing the Sv-Av value. FIG. 54 shows a state obtained by adding corrections to the state shown in FIG. 53. , Fig. 55, and Fig. 56 respectively show the display mode of the shooting information display device when the shadow reference shooting mode is selected in the spot auto shooting mode, and Fig. 55 shows the bar display of the average Tv value once The state returned to the position corresponding to the lowest luminance value, Fig. 56, is the average value from the state shown in Fig. 55.
Figures 57 to 59, which respectively show the state in which the Tv value bar display has moved to the positive side by 2 2/3 Ev, respectively show the display mode of the shooting information display device in the direct auto memory shooting mode. Figure 57 shows the memory set state, Figure 58 shows the memory hold state, and Figure 59 shows the memory hold state.
The figures each show the state in which corrections have been made using memory hold, Figure 60 shows the display mode of the photographing information display device in spot auto memory photography mode, and Figures 61 and 62 show normal manual photography. 61 shows a bar display of deviation from the standard exposure level, and Fig. 62 shows a bar display of deviation from the standard exposure level with correction. FIGS. 63 to 65, which show the added states, respectively show the display mode of the shooting information display device in the spot manual shooting mode, and FIG. 63 shows the added average of the deviation from the standard exposure level. The state where the bar is displayed, Fig. 64 shows the state where a new spot input has been performed from the state shown in Fig. 63, and Fig. 65 shows the state where correction has been added from the state shown in Fig. 64. , respectively, FIG. 66 shows,
FIG. 67 is a diagram showing the display mode of the photographing information display device when the highlight standard photographing mode is selected in the spot manual photographing mode, and FIG. 67 shows the photographing information display device when the shadow standard photographing mode is selected in the spot manual photographing mode. Figures 68 to 72 each show the display mode of the shooting information display device in the flash auto shooting mode, and Fig. 68 shows the display mode of the deviation from the standard exposure level. Fig. 69 shows a state in which correction has been added from the state shown in Fig. 68, Fig. 70 shows a state in which the image was overexposed after taking the picture, and Fig. 71 shows a state in which it was underexposed after taking the picture. FIG. 72 shows a state in which the exposure after photographing is appropriate, and FIG. 73 is a diagram showing the display mode of the photographing information display device in the strobe manual photographing mode. 5...Aperture value setting ring, 7...Manual shutter speed setting ring, 10...Camera, 11...Shutter release button, 13...Memory command operation knob, 14...Spot input button, 15... Highlight command button, 16...Shadow command button, 18...Film sensitivity setting dial, 21...Operation knob for shooting mode switching, 22...Operation knob for exposure compensation, 3
9... Shooting information display device (shooting information display section), 4
1... Light receiving device for photometry, 50... Microcomputer (CPU), BV1... Brightness value by average photometry, BV2... Brightness value by spot photometry,
CV...Correction value, _D1 ...Light emitting diode for charging completion display, H0~H2...Common signal, J0~J3
8... Segment drive signal, PD ₁ ... Photovoltaic element for average photometry, PD ₂ ... Photovoltaic element for spot photometry, RE ₀ to _{RE 2} ... Back electrode, SEG ₁ to _{SEG 101}
...Segment (display area), SV-AV ...Calculated value of film sensitivity value and aperture value, SW ₁ ...Release switch, SW ₂ ...Trigger switch, SW ₃ ...
...Manual switch, SW ₄ ...Auto switch, SW ₅ ...Battery check switch, SW ₆
...Memory switch, SW ₇ ...Clear switch, SW ₈ ...Spot input switch, SW ₉ ...Highlight switch, SW ₁₀ ...Shadow switch.

Claims (1)

[Scope of Claims] 1. Partial photometry means for photometering a substantially central portion of a photographic screen and outputting a luminance value of this portion; an operating member for manually commanding input of the luminance value; and an operating member operated by the operating member. a plurality of storage means for storing each brightness value; and a plurality of storage means for storing each brightness value; a first calculating means that calculates for each luminance value; and a plurality of display elements arranged in a straight line,
a first display means that puts a display element corresponding to an exposure control value corresponding to each brightness value calculated by the calculation means into a display state, and performs an average calculation of the plurality of brightness values, and calculates the average calculation result. A second calculation means for calculating an actual exposure control value actually used for exposure control using the exposure correction value in addition to the exposure element used in the first calculation means.
a plurality of display elements are arranged in parallel with the linearly arranged display elements of the first display means, from the display element at one end of the display area to the second arithmetic means; A display device for a camera, comprising: second display means for displaying display elements up to the display element corresponding to the calculated actual exposure control value.