JPS59170821A - Automatic exposure camera - Google Patents

Abstract

PURPOSE:To realize photography in response to the purpose of a photographer by inputting subject brightness values measured at desired positions by a storage type light metering means at proper points, and processing those values and performing exposure control in various automatic photographic modes. CONSTITUTION:When a camera is powered on, a working voltage is applied to an electric circuit, whose respective parts are put in operation to initialize a flag and a memory under the control of a CPU34. Then, subject brightness is measured at desired light metering positions successively by the storage type light metering means, and plural pieces of subject brightness information obtained as mentioned above and a preset shutter speed value are used to calculate an aperture value on the basis of a specific arithmetic expression. Then, this aperture value is transmitted to an aperture control means to perform the exposure control so that the proper amount of exposure on a film surface is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic exposure camera, and more particularly to an automatic exposure camera that has a memory type photometer and performs automatic exposure control based on stored subject brightness information.

As is well known, photometry methods in cameras are broadly classified into average photometry methods and partial (spot) photometry methods. The average photometry method is a method that averages the light over a relatively wide area of the subject, and because it produces acceptable results for normal subjects, this method is used in most general cameras.

On the other hand, the partial metering method measures light in a small area of the subject in spots, and is effective when you want to adjust the exposure to one side of the subject with a large contrast ratio, but it is cumbersome to operate. In addition, there is a drawback that there is a large risk of taking photographs with inappropriate exposure. Therefore,
When photographing ordinary subjects, the average photometry method can be said to be superior to the partial photometry method.

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, as the photographer's skill improves, there will be more opportunities to photograph objects with such a large contrast ratio. However, when shooting a subject with a large contrast ratio with a camera that uses average metering, the exposure is controlled based on the averaged subject brightness.
When a subject with a large contrast ratio wants to be exposed to one side, the photographer's intention cannot be fully reflected.

Therefore, a multi-point photometry camera has already been proposed, which is equipped with a memory-type partial photometer, which measures the light of a desired spot on a subject with a large contrast ratio at any time, and stores the spot brightness value. According to such a camera, calculations can be performed on the plurality of stored spot brightness values, and the exposure level can be determined based on the calculation result value, so the photographer's intention can be determined. It is possible to perform exposure control that fully reflects this. However, in conventional cameras of this type, it has been possible to perform automatic shooting in which the shutter speed is automatically determined by setting the aperture (hereinafter referred to as aperture-priority auto shooting); Shooting that automatically determines the aperture in advance (hereinafter referred to as shutter-second-priority auto photography) and photography that automatically determines both aperture and shutter speed (hereinafter referred to as program auto photography) is not possible. .

However, if these various types of photography can be arbitrarily selected and carried out with a single camera, it will be very convenient because it will be possible to perform automatic photography over a wide range according to the photographer's intentions.

In view of the above-mentioned points, an object of the present invention is to perform exposure control according to a predetermined calculation formula after photometrically storing subject brightness information at a plurality of desired locations, and in particular to perform shutter speed priority auto shooting, program auto shooting, etc. To provide an automatic exposure camera capable of photographing in various automatic photographing modes.

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

FIG. 1 shows an electromagnetic aperture mechanism within a camera barrel that is detachably attached to the camera body of an automatic exposure camera of the present invention. In FIG. 1, an aperture ring 1 is rotatably held on a camera barrel (not shown), and a sliding electric contact piece 2 is fixed to its inner end surface. This electrical contact piece 2 is designed to come into sliding contact with the resistor on the resistor board 4.
This electrical contact piece 2 and the resistor on the resistor substrate 4 constitute a variable resistor RV6. This variable resistor RV6 is introduced into the camera as the set aperture value ΔAV from the open aperture when the aperture ring 1 is rotated to set the aperture in the aperture priority auto shooting mode.

The resistor substrate 4 is fixed to the end face of a yoke 3 made of a magnetic material fixed to the lens barrel, on the side opposite to the electric contact piece 2. Also, the substrate 4 of this yoke 3
A plurality of permanent magnets 5, that is, permanent magnets 5a, 5b, 5c...
The magnets are attached so that the polarities shown in the figure are opposite, that is, the N and S poles of adjacent magnets are opposite to each other. A diaphragm drive ring 6 is rotatably held in the lens barrel behind the yoke 3 (on the right side in the figure), and the ring 6 faces the permanent magnets 5a, 5b, 5c. There are multiple coils 7 on the surface.
, that is, coils 7a, 7b, . . . are arranged, and a sliding electric contact piece 8 is fixed to the back surface. The permanent magnet 5 and the coil 7 form a narrowing electromagnet Mg3 (see FIG. 3), which will be described later. This aperture blade drive ring 6 has a plurality of radial notch grooves 6a on the inner peripheral edge of its central opening, and these notch grooves 6a have a plurality of radial notch grooves 6a in which the aperture blades 9 (only one leaf is shown) are formed. ) is fitted into the drive pin 9a. The aperture blades 9 have their bases swingably supported by a fixed member of the lens barrel, and are swung around the support shaft by rotation of the aperture blade drive ring 6 to form an aperture opening. A gear 6b is formed on a part of the outer periphery of the drive ring 6, and a gear 6b is provided at a right position opposite to the outer periphery having the gear 6b and engages with the gear 6b. A retaining member 10 for stopping rotation is provided.

This engaging member 10 is given the habit of rotating clockwise by a spring 11 around a support shaft 10a supported by an immovable member of the lens barrel. The mating pawl is in a position where it does not engage with the gear 6b and is regulated by the stopper 12. An electromagnet Mg4 (see FIG. 3) for stopping the aperture is disposed near a portion of the engaging member 10 that faces the stopper 12. When the electromagnet Mg4 is energized by energization, it rotates the engaging member 10 against the rotational behavior, attracts and holds the lower end of the engaging member 10, and thereby attaches the engaging claw to the diaphragm blade drive ring. 6 to stop rotation of the drive ring 6. The aperture blade drive ring 6 is given a habit of rotating counterclockwise around the optical axis O by the spring 13, and this rotation allows the aperture blades to be held at the fully open position. ing. Further, behind the drive ring 6 (on the right side in the figure), a yoke 14 made of a magnetic material is fixed to the lens barrel.
A resistor substrate 15 is disposed on the surface of the yoke 14 at a position facing the electric contact piece 8 . The electric contact piece 8 slides into contact with the resistor on the resistor substrate 15, thereby forming a variable resistor RV7 for introducing the actual aperture change value AVC. When the aperture blade drive ring 6 performs a clockwise aperture rotation against the rotational behavior of the spring 13, the variable resistor RV7 changes in accordance with this aperture reduction, and the actual aperture change value AVC changes.

Further, the lens mount 16 provided at the rear end of the camera barrel is provided with a lens barrel side connector 17 on its rear end surface. This connector 17 includes the variable resistor RV6,
The lead wires of RV7, coils 7a, 7b... and electromagnet Mg4 are connected, and when the camera barrel is attached to the camera body, the connector on the side of the camera body (
(not shown) serves to connect the variable resistor, coil and electromagnet to an electrical circuit within the camera body. The lens mount 16 is provided with electric contacts J1 to J3 protruding toward the camera body for transmitting the open aperture value AVO of the lens of this lens barrel to the camera body. This electrical contact is grounded to the body, and the combination of the presence or absence of the three contacts J1 to J3 is determined according to the above-mentioned open aperture value AVO, and seven types of open aperture value AVO are connected to the camera body. It is now possible to transmit.

FIG. 2 shows the optical system of a single-lens reflex camera disposed within the automatic exposure camera of the present invention. As is well known, in the optical system of a single-lens reflex camera, a movable reflection mirror 20 is normally arranged at a rotating position and is inclined at 45 degrees with respect to the photographing optical path. The object light that enters the camera through 21 is reflected vertically upward and is made to enter the finder optical system. The finder optical system includes a focusing glass 23 disposed at a position optically conjugate with respect to the photosensitive surface of the photographic film 22, and this focusing glass 2.
A condenser lens 24 disposed directly above the condenser lens 3, a pentaprism 25 disposed directly above the condenser lens 24, and a pentaprism 25 disposed so as to face the rear end surface which is the light output end of the pentaprism 25. At the rear edge between the focusing glass 23 and the condenser lens 24, there is a photographing information display device 27 consisting of a light-transmissive liquid crystal display panel, which will be described later.
or has been set up. Further, a semi-transmissive portion 20a is formed in the center of the movable reflective mirror 20, and a total reflective mirror 28 is formed on the back side of the movable reflective mirror 20 corresponding to the semi-transparent portion 20a. The total reflection mirror 28 is movably attached to form a predetermined angle with the movable reflection mirror 20.
It serves to reflect the object light that has passed through 0a toward the bottom of the camera, and to receive this light through the condenser lens group 29 to the spot photometry light receiving element PD arranged in the same part.

FIG. 3 shows the electrical circuit in the automatic exposure camera of the present invention. In this electric circuit, a reference voltage circuit 31
The output terminal that generates the reference voltage Vref is operational amplifier A.
1, A2 and A3, respectively. The inverting input terminal of the operational amplifier A1 is grounded via the constant current source 32, and the reference voltage V
It is connected to the output terminal of the same operational amplifier A1 via a semi-fixed resistor RV1 that adjusts ref to introduce each photographic information. Between the output terminal and the non-inverting input terminal of this operational amplifier A1, a variable resistor RV4 for introducing an exposure correction value CV, a variable resistor RV5 for introducing a film sensitivity value SV, and a set aperture from the above-mentioned open aperture are connected. A variable resistor RV6 (see Fig. 1) for introducing the reduction value ΔAV, a variable resistor RV7 (see Fig. 1) for introducing the actual aperture change value AVC for the exposure control, and a shutter time value TV. Variable resistors RV8 for inputting are connected in parallel, and variable sliders of these variable resistors RV4 to RV8 serve as inputs for inputting the above-mentioned photographic information to a multiplexer 33 composed of a plurality of analog switches. connected to the terminal. Further, the inverting input terminal of the operational amplifier A2 is grounded via a semi-fixed resistor RV2 for adjusting the subject brightness value BV to be spot photometered, and
It is connected to the collector of PNP transistor Q1. The emitter of this transistor Q1 is connected to the output terminal of operational amplifier A2, and the base is connected to the non-inverting input terminal of operational amplifier A2. And op amp A2
The output terminal of is also connected to the emitter of a PNP transistor Q2, whose collector and base are connected to the non-inverting input terminal and the inverting input terminal of the respective operational amplifiers A3. The spot photometry light receiving element PD (see FIG. 2) is connected between the inverting input terminal and the non-inverting input terminal of this operational amplifier A3, with the anode facing toward the fully inverting input terminal. The inverting input terminal of the operational amplifier A3 is connected to an output terminal, which is connected to an input terminal of the multiplexer 33 for introducing spot brightness information.

As mentioned above, the multiplexer 33 is composed of a plurality of analog switches, and the six input terminals receive the correction value CV from the variable resistor RV4 of the operational amplifier A1.
output voltage according to film sensitivity value SV by variable resistor RV5, output voltage according to set aperture value ΔAV from open aperture by variable resistor RV5, output voltage according to actual aperture change value AVC by variable resistor RV7 An output voltage corresponding to the shutter time value TV from the variable resistor RV8, and an output voltage corresponding to the spot brightness value BV from the operational amplifier A3 are applied.

The multiplexer 33 is for selectively outputting one of the six photographic input information,
For this purpose, the control input terminal is a central processing unit (hereinafter abbreviated as CPU) 3 consisting of a microcomputer.
It is connected to output port O1 of No. 4. Further, the output terminal of the multiplexer 33 is connected to a comparator A that constitutes a successive approximation type A-D conversion circuit together with the D-A converter 35.
It is connected to the inverting input terminal of 5. The D-A converter 35 includes an operational amplifier A4 and this D-A converter 35.
semi-fixed resistor RV3 for adjusting the output level of C
Analog switches S0 to S7 that are turned on and off by commands from the PU 34, and these analog switches S0 to S7
The reference current sources 36 to 43 are connected to the reference current sources 36 to 43. That is, the output terminal of operational amplifier A4 is connected to the non-inverting input terminal of operational amplifier A5, and the operational amplifier A
The above semi-fixed resistor RV is connected between the output terminal of 1 and the inverting input terminal.
3 is connected to the inverting input terminal of the operational amplifier A4, one end of each of the analog switches S0 to S7 is connected to the inverting input terminal of the operational amplifier A4, and the other end of each of the analog switches S0 to S7 is connected to a reference current source 36.
~43 are all connected to ground. Analog switch S0
~ Each control input terminal of S7 is the output port O2 of the CPU 34
The analog switches S0 to S7 are turned on and off by commands from the CPU 34. The reference current sources 36 to 43 are ■/8 and 2I, respectively.
/8, 4I/8, I, 2I, 4I, 8I, 16I. Therefore, by turning on and off the analog switches S0 to S7 according to commands from the CPU 34, these analog Switch S0~S
A weight current will flow through 7. Comparator A above
The output terminal of 5 is connected to the input port I1 of the CPU 34.

In addition, three electrical contacts provided on the camera body mount (not shown) connect with electrical contacts J1 to J3 on the lens mount 16 (see Figure 1) of the camera when the lens barrel is attached to the camera. K1 to K3 are connected to an input port I2 of the CPU 34 for introducing the open aperture value AVO of the lens of the camera barrel.

Further, a normally closed trigger switch SW5, which opens at the beginning of the movement of the shutter front curtain when the shutter is released to detect the start of exposure, is provided in a trigger delay circuit having a comparator A6, and one end of the switch SW5 is connected to +Vc.
It is connected to a terminal 44 to which a power supply voltage of c is applied,
The other end of the trigger switch SW3 is connected to the inverting input terminal of the comparator A6, and is also grounded via a flat fixed resistor RV9 for adjusting the trigger delay time. The above semi-fixed resistor R is connected in parallel with the trigger switch SW5.
A capacitor C0, which forms a time constant circuit together with V9, is connected. Resistors R1 and R2 are connected in series between the power supply voltage terminal 44 and ground, and a connection point between the resistors R1 and R2 is connected to a non-inverting input terminal of comparator A5. The output terminal of comparator A6 is connected to input port I3 of CPU34. In addition, the input port I4 of the CPU 34 has one end of a self-resetting normally open spot input switch SW1 that is linked to the suppression operation of a spot input button (not shown) provided at an easily operated position on the outside of the camera. The other end of the switch SW1 is grounded. Connected to the input port I5 of the CPU 34 is one end of a self-resetting normally open clear switch SW2 that is linked to the pressing operation of a clear button (not shown) provided on an easy-to-operate device on the outside of the camera. , the same switch SW
The other end of 2 is grounded. This clear switch SW2
is set to CP by closing the spot input switch SW1.
This is for clearing the information input and stored in U34.

An output port O3 of the CPU 34 is connected to an input terminal of a photographing information display device 27 consisting of a liquid crystal display panel.

Also, the output port O4 is an electromagnet M for restraining the shutter front curtain.
The output port O5 is connected to the input terminal of a shutter trailing curtain drive circuit 46 having an electromagnet Mg2 for restraining the shutter trailing curtain. Further, the output port O6 is connected to the input screw of the aperture drive circuit 47 having an electromagnet Mg3 for aperture stop, and the output port O7 is connected to an electromagnet Mg3 for aperture stop.
g4 is connected to the input terminal of the aperture stop circuit 48. The electromagnet Mg3 is an electromagnet formed by a combination of a permanent magnet 5 and a coil 7 provided in the electromagnetic diaphragm mechanism shown in FIG. 1, and the electromagnet Mg4 is also provided in the electromagnetic diaphragm mechanism shown in FIG. This is an electromagnet for stopping the rotation of the aperture blade drive ring 6 by adsorbing the engaging member 10 that is attached to the engagement member 10 .

Input ports I6, I7, and I8 of the CPU 34 are connected to respective auto-photographing mode contacts of a photographing mode selection switch SW3 whose movable contact piece is grounded. That is, input port I6 is in aperture priority auto shooting mode (hereinafter referred to as A.
The input port I7 is the contact 3 for the shutter time priority auto shooting mode (hereinafter referred to as T/A mode), and the input port I8 is the contact 3 for the program auto shooting mode (hereinafter referred to as P/A mode). (referred to as A mode) respectively. The contact d is a floating contact that is connected to the mode selection switch SW3 when the switch SW3 is in the OFF state. The input port (2) 9 is grounded via a release switch SW4 which closes when the movable reflective mirror 20 is initially raised in conjunction with the pressing operation of a shutter release button (not shown) and opens when the mirror finishes lowering.

All of the input ports I1 to I9 of the CPU 34 have built-in pull-up resistors (not shown). Therefore, when various signals are introduced to the input ports I1 to I9, the input ports I1 to I9 are connected to the input ports I1 to I9. The level of I9 is '1'
becomes '0'.

FIG. 4 is a block diagram showing the internal configuration of the CPU 34, which is the core of the control system in the automatic exposure camera of the present invention. In the figure, a clock generator (CLOCK
) 51 is a part that generates pulses that serve as a reference for the operation of the CPU 34, and a control circuit (CONT) 52 is a part that generates pulses that serve as a reference for the operation of the CPU 34.
C is the central part that controls the entire operation of 34.
The PU 34 needs to transfer and process various binary data in an orderly manner according to a determined program order, but in order to do so, it is necessary to know when and for how long the gates inside the CPU 34 should be open, and how long the gates inside the CPU 34 should be open. It is necessary to have a part inside the CPU 34 that determines whether to set or reset the flip-flop depending on the state of the CPU 34 and the state of the input. CONT52 is responsible for this work. The instruction register (INR) 53 is a part that temporarily holds the contents of a random access memory (RAM) 64, which will be described later.
The state of each part of 34 is determined. Program counter (P
C) 56 is a part that stores the address to be executed from now on in order to execute the program in an orderly manner.
It gets bigger one by one. Stack pointer (SP) 5
7, when an interrupt instruction or a jump instruction to a subroutine occurs, the contents of the PC 56, accumulator (ACC) 59 (described later), index register (IX) 58 (described later), etc. are not destroyed. This register is used to temporarily hold the contents when you return from those instructions and want to use it again. IX58 is a register for storing an instruction execution address when executing an instruction in index address format. The arithmetic processing circuit (ALU) 61 is a part that performs operations related to arithmetic operations in the execution of instructions, and executes addition, subtraction, and invert instructions to invert the contents of memory ('1' or '0'). It also performs logical operations such as logical sum or logical product of two memories. The condition code register (CCR) 62 is a register for storing a code used for state detection in a flag when executing an instruction requiring a judgment such as a branch instruction. C.P.
The judgment function occupies an important position for the U34, and in the control of the automatic exposure camera of the present invention, as will be described later, the state of each input port ('1' or '0') is judged 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 CCR6
This is done by determining the state of the flag in step 2. The CCR62 has a result of 2 when the instruction is executed.
Negative flag that becomes '1' when the complement becomes negative and '0' when it becomes positive, the result is '0'
', the zero flag becomes '1' and '0' when the result is not '0'; the overflow flag becomes '1' when the result causes a two's complement overflow, and '0'otherwise; Consists of various flags such as a carry flag that becomes '1' when a carry or pollo occurs from an unsigned binary number as a result of an operation, and '0' when no carry occurs.Memory Buffer Register (MBR)
Reference numeral 55 denotes a register from which, when an address to be read is entered in the storage address register (SAR) 54 and a read instruction is issued to the memory, the contents of the specified address are read out.

A read-only memory (ROM) 63 is used to cause the CPU 24 to execute instructions while sequentially reading out contents. Also, random access memory (RAM)
Reference numeral 64 denotes a memory that temporarily stores values during arithmetic processing, their results, or various input information. The display random access memory (DRAM) 65 has an area corresponding one-to-one to each segment of the liquid crystal display board forming the photographing information display device 27 (see FIGS. 3 and 5 to 14). If the content of a particular address becomes '1', the corresponding segment of the liquid crystal display panel is configured to glow in color. Liquid crystal drive circuit (LCDD) 6
Reference numeral 6 denotes a circuit for driving the photographing information display device 27, which is a liquid crystal display panel, to generate color using a self-distribution method, from which a plurality of segment lines and common lines are respectively drawn out. The input port (INPP) 68 is formed by the nine input ports I1 to I9, as described above, and the output port (OUTPP) 69 is formed by the seven output ports O1 to O7, respectively, as described above. (See Figure 3). Note that all outputs of OUTPP69 are latch outputs.

Next, the flow of control of the CPU 34 configured as above will be briefly explained.

The CPU 34 repeats two cycles: first, a fetch cycle in which the instruction stored in the address in the memory specified by the PC 56 is loaded, and then an execute cycle in which the instruction is executed. First, the value of PC56 is transferred to SAR54. At the same time, the contents that were previously in the PC56 are stored in the PC56.
1' is added and stored. When the address to be read is entered in the SAR 54, the memory is instructed to read by setting 2, and after a while, the contents of the address instructed to the MBR 55 are read out. The instruction code part is transferred to INR53. This is a fetch cycle. Following this, an execute cycle is entered, but this operation differs depending on the contents of INR53. As an example, now INR53 and ACC59
Assume that an instruction (LDA instruction) to load the contents of memory is included in the instruction. The address part of the instruction remaining in the MBR 55 is transferred to the SAR 54, then a read command is issued to the memory, and after a while, the obtained data is transferred to the MBR 55.
Transfer to CC59 and end the command. Another example shows how conditional branches and instructions that frequently appear in the flowcharts described later are executed. Now, if you want to determine the state of a certain input port (let's call it port A) and make a conditional branch, do the same as in the above example:
In the fetch cycle, the contents of the A port are read to the MBR 55. It is assumed that the bit of the A port is in the most significant bit of the memory. Now INR53 and ACC5
9 contains an LDA instruction to store the contents of the memory, the contents of the A port are transferred to the ACC 59 in the same manner as in the above example. Subsequently, the PC 56 instructs the address to be executed next, and the instruction is stored in the MBR 55 in exactly the same manner. Now INR53 with ACC
Suppose that an instruction (ROL instruction) to shift the most significant bit of CCR 59 to the carry flag of CCR 62 is included, then in the next execution cycle, the carry flag will have the state of A port ('0' or '1'). ) has been stored. Next, in the same way, the state of the carry flag is determined, and if the carry flag is 'l', it branches, and if not, it executes an instruction (BCS instruction) to directly execute the next program. can be fulfilled. In the latter example, LDA,R
Although three instructions, the OL and BCS instructions, are used, desired control can be performed by arbitrarily combining dozens of types of instructions in this way.

Note that the flowchart described later (Figure 15 or 2)
(See Figure 2) does not show at the machine language level how to specifically use each block shown in Figure 4 to execute the program, but the transfer instructions in the program, Addition and subtraction operations can be easily realized using known methods.

FIGS. 5 to 14 show display modes on the photographic information display device 27, respectively. This display device 2
Reference numeral 7 is formed of a well-known liquid crystal display board, and has aperture value electrodes of "16" to "14" arranged in a row in the horizontal direction, and a row of aperture value electrodes arranged in a horizontal direction directly above the aperture value electrodes. "2000"～
“4” shutter time value electrode (“2000” to “1”
” means 1/2000 second to 1 second), rectangular bar display segment electrodes arranged horizontally in a line in sequence immediately above the shutter time value electrode, and Rhombus-shaped point display segment electrodes are arranged in a row in the horizontal direction directly above the bar display segment electrode, and a "+-" correction electrode is provided at the right end of the aperture value electrode. Each electrode is made of a transparent electrode, and the display device 27 is of a light transmission type.

The bar display segment electrodes are for displaying the shutter time value or lamp aperture value corresponding to the summed average value of the input spot brightness values, and the point display segment electrodes are for displaying each spot brightness value. This is for displaying the shutter speed value or aperture value corresponding to the . This point display segment electrode and the bar display segment electrode are manufactured by A. In A mode, the shutter time value is displayed (see Figures 5 to 8), and in T. In A mode, the aperture value is displayed (see Figures 9 to 11), and P. In A mode, the shutter speed and aperture value determined by the program diagram (see Figure 23) are displayed (12th to 14th).
(see figure).

As mentioned above, each of the above electrodes has memories corresponding one-to-one assigned to them in the DRAM 65 (see Figure 4), and voltages are selectively applied to the electrodes according to the contents of these memories. is applied, the shutter time and aperture are displayed, and the shutter time value TV and aperture value AV are displayed in bars, points, etc. Therefore, all displays on the display device 27 are latch displays, and once a certain segment is displayed, the display of that segment will not be cleared unless the contents of the corresponding memory are changed.

Next, the operation of the automatic exposure camera of the present invention configured as described above will be explained with reference to the flowcharts shown in FIGS. 15 to 22. In addition, in the interpretation of the flowchart, MX (X is any letter or number)
is a memory address, (MX) is the content of the memory at the MX address, and "←" is a transfer. Therefore, for example, "MN←0" means '0' in the memory at address MN.
"M7←(M1)" means to store '.
This means that the contents of the memory at address M1 are transferred to the memory at address M7.

First, when power is applied to the camera, an operating voltage is supplied to the electric circuit shown in FIG. 3, and each part of the circuit becomes operational. In the CPU 34, the program starts from the flowchart for mode determination shown in FIG. 15, and flags and memory are initialized. First, in order to initialize the spot input detection flag MS for checking whether the spot input switch SW1 has been updated, '0' is stored in the flag MS. Next, in order to initialize the spot input number memory MN, '0' is set in the same memory MN.
is stored. Subsequently, in order to initialize the mode detection memory MC for storing numerical values corresponding to each automatic shooting mode, '0' is stored in the memory MC.

Next, whether or not the clear button is being operated is detected by determining I5=0. If the clear button is operated and clear switch SW2 is turned on, I5
= 0, this determination is exited with a yes (hereinafter, the branching direction of yes is indicated by Y on the flowchart), and after storing '0' in the memory MN, the determination of various photographing modes begins.

Moreover, if the clear button is not operated and the clear switch SW2 is turned off, I5=0, so the determination of I5=0 is determined as NO (hereinafter, the branch direction of NO is indicated by N on the flowchart). The camera exits and immediately enters into discrimination between various shooting modes. The shooting mode is determined by A.I6=0.
A mode, T. by determination of I7=0. A mode, I8=
P. by determination of 0. It is performed in the order of A mode. Therefore, after turning on the power, do not switch the shooting mode selection switch SW3 to any of the automatic shooting mode contacts, but turn it OFF.
If it remains connected to contact d of I6=
0, I7=0, and Il8=0 are all passed as NO, the display on the display device 27 is turned off, and then the process returns to the state after the initial setting through (1)-(1). Therefore, when the selection switch SW3 is off, the display device 27 will not enter the display state even if the power is turned on, and the microcomputer will not display (1)-(1).
Only the mode is determined in the intervening loop, and its power consumption is low. The operation will be explained below for each automatic shooting mode.

(A)A. When A (aperture priority auto shooting) mode is selected.

Here, set the shooting mode selection switch SW3 to A. When connected to contact a of A mode, the above judgment of I6=0 is passed as YES, and through (2)-(2), A.
The process branches to the A-mode flowchart. Note that the mode selection switch SW3 is set to A. When switching to the A mode, although not shown in the flowchart, first, a basic display is performed on the display device 27. This basic display, as shown in FIG. 5, is an index display of the shutter speed from "2000" to "1".

This A. In the A-mode flowchart, first, (MC
)=A is determined. 'A' is A. This is a unique value depending on the A mode, and at this time the mode detection memory MC
If the content (MC) of is not 'A', then A. Assuming that A mode has just been selected, the judgment of (MC)=A is passed as NO, and '0' is stored in the spot input number memory MN.
', then 'A' is stored in the memory MC. From the second flow after 'A' is stored in the memory MC, the above-mentioned determination is YES. After 'A' is stored in memory MC, or after it is confirmed that 'A' is stored in memory MC, whether or not spot input switch SW1 is turned on is determined by I4=0. It is done. If the spot input switch SW1 is not turned on, the judgment of I4=0 is passed as NO, and after storing '0' in the flag MS, check whether the contents of the memory MN (MN) are '0'. A determination is made whether or not. At this time, if the number of spot inputs (MN) by the spot input switch SW1 is 0, the determination of (MN)=0 is YES, and after this, subroutine SUB1
Then, various photographic information is introduced. In the subroutine SUB1, as shown in FIG.
The set shutter second time value TV, the film sensitivity value SV in the memory M5, the corrector CV in the memory M3, the open aperture value AVO in the memory M4, and the set aperture value ΔAV from the open aperture are input in the memory M5, respectively. These photographic information inputs are performed using the shutter time value T in the electric circuit shown in Fig. 3.
V, the film sensitivity value SV, the correction value CV and the aperture value ΔAV are sequentially applied to the multiplexer 3.
A successive approximation type A-D consisting of a D-A converter 35 and a comparator A5
This is done by sequentially inputting digital quantities into the input port I1 through a conversion circuit. The open aperture value AVO is input by being taken into the input port I2. Next, the apex calculation of the open aperture value AVO stored in the memory M5 and the setting aperture value ΔAV stored in the memory M5 is performed {(M4)+(M5
)} is performed, and this calculation result value (AV) is stored in the set aperture value storage memory M6. Thereafter, when the process returns to the flowchart shown in FIG. 16, the aperture value AV (M6) is stored in the memory M6 and displayed again. For example, the set aperture value (M6) at this time is "5".
．． 6", only "5.6" is displayed as the aperture index on the display device 27, as shown in FIG. Subsequently, the process moves to subroutine SUB2, where it is determined whether or not exposure compensation has been set. Here, as shown in FIG. 21, whether or not a corresponding value C1 without correction is stored in the correction value storage memory M3 is determined by the determination formula (M3)=C1.
If the correction setting has not been made, the above judgment is passed with a yes, and the correction display of "+-" on the display device 27 is erased. If the correction settings have been made, (M3
)=C1 is passed as NO, and a correction display of "+-" is performed. After this, when the process returns to the flowchart shown in FIG. 16, the spot brightness value BV is inputted from the input port I1 and stored in the memory MB in the same way as when inputting various photographic information such as the shutter time value TV. Stored.

Then, the spot brightness value BV stored in this memory MB, the film sensitivity value SV stored in the memory M2, and the aperture value ΔAV stored in the memory M5.
Apex operation with {(MB)+(M2)-(M5)}
is performed, and the shutter time value TV as the result of this calculation is stored in the scanning point display memory MT. Here, the spot brightness value (MB) = BV is the amount of light that has passed through the open aperture, so if the subject brightness value is BV0, then TV = BV0 + SV - AV (1) BV = BV0 - AV0 (2), Furthermore, since AV=AVO+ΔAV(3), by substituting equations (2) and (3) into equation (1), TV=BV+SV−ΔAV(4) is obtained. Subsequently, the shutter time value TV(MT) obtained by the above calculation is displayed at the scanning point on the display device 27. The display state at this time is as shown in FIG. That is, in Fig. 5, the shutter time value (MT) corresponding to the spot brightness value currently being metered is displayed as a point, and the point display changes as the camera moves or the brightness of the subject changes. Accordingly, it moves in the left and right directions indicated by the arrows.

After the scanning point is displayed, the set aperture value (M6) stored in the memory M6 is transferred to the aperture value storage memory M8, and then, through (5)-(5), the exposure control flowchart shown in FIG. However, in the flowchart of FIG. 19, it is first detected whether or not the shutter release has been performed by determining I9=0, so if it is before the shutter release, this determination is passed as no ( 1)-(1), return to the mode determination flowchart shown in FIG.
6 = 0 is passed as YES, and A. Shift to the A mode flowchart.

Here, when the spot input switch SW1 is turned on for the first time, the above judgment of I4=0 is passed as YES, and then (M
S)=0 is determined. Initially, the spot input detection flag MS is '0', so exit this judgment with a yes,
Move to subroutine SUB3 and save memory MN and flag M.
Update S. That is, in subroutine SUB3, as shown in FIG. 22, first, the calculation {(MN)+1} is performed, and the resultant value of this calculation is input into the memory MN. Next, after passing the judgment of (MN) = 11 with a no,
The flag MS is set to '1' and the spot brightness value BV being photometered is stored in the memory MBn. This memory M
The n of Bn has a one-to-one correspondence with the number of spot inputs (MN), and the memory MBn stores the amount of light passing through the open aperture of the lens at each spot input, that is, the spot brightness value BV. Thereafter, the flag MS is set to ``1'' again and the process returns to the flowchart shown in FIG. 16, and through (1)-(1), the process returns to the mode determination flowchart shown in FIG. 15. Then, by passing the above subroutine SUB3 once, (MS
) = 1, (MN) = 1, so in the next flow, the judgment of (MS) = 0 and the judgment of (MN) = 0 are passed through with no, respectively, and the process moves to subroutine SUB1, where the above-mentioned After storing various photographic information in the memories M1 to M6 (see FIG. 20), the spot brightness value BV stored in the memory MBn, the film sensitivity value SV stored in the memory M2, and the memory Apex calculation {(MBn)+(M2)-(M5)} is performed with the setting narrowing-down value ΔAV stored in M5, and the calculation result value (TV) is stored in point display memory MSn. Subsequently, the shutter time value TV (MSn) obtained by the above calculation is displayed as a point on the display device 27 (see FIG. 6). After this, the above memory M
n = 1 to N of shutter second time value TV stored in Sn
An arithmetic operation is performed between the addition average value of and the correction value CV stored in the memory M3, and this is stored in the shutter speed value storage memory M7. Subsequently, the shutter time value (M7) obtained by the above calculation is displayed as a bar on the display device 27. The display state at this time is as shown in FIG. That is, the sixth
In the figure, the point display on the left side indicating 1/60 second is the point display of the shutter second value (MSn) stored in the memory MSn, and is a fixed display. At this time, since n=1, this fixed point display is only one point (MS1), and therefore, the shutter second value (M
If the correction value CV is zero, the bar display in 7) becomes a display value that matches the point display (MS1). After the shutter time value (M7) is displayed on the bar, the aperture value setting (M6) is displayed numerically after passing through subroutine SUB1 as described above, and then subroutine SUB1.
Through B2, the spot brightness value BV is stored in the memory MB, and further apex calculation {(MB)+(M2)-
(M5)} is performed and the result value (TV) is stored in memory M
The scanning point of this shutter time value (MT) is displayed. In Figure 6,
The point display on the right is a scanning point display (MT), which moves horizontally on the display device 27 according to the brightness and darkness of the subject.

After turning on the above-mentioned spot-filled Kasuinochi SW1 once,
As long as this on state is maintained, after passing through the judgment of I4=0 with a yes, the judgment of (MS)=0 will not pass with a no and the flow will not proceed to subroutine SUB3, and (M
Since the determination of N)=0 is passed as NO, the display state on the display device 27 is as shown in FIG. Then, when the spot input switch SW1 is turned off from this state, the determination of I4=0 is passed as NO, so the spot input detection flag MS is initially set to '0'. Therefore, after this, when the spot input switch SW1 is turned on again, the flow passes through the determination of I4=0 with a yes, then exits with the determination of (MS)=0 with a yes, and proceeds to subroutine SUB3. And subroutine SUB3
(See FIG. 22), '2' is stored in the spot input number memory MN by the calculation {(MN)+1}.

Subsequently, after passing through the determination of (MN) = 11 as NO, the flag MS is set to '1', and the memory MBn (n = 2
), the spot brightness value BV is stored in
After S is set, the process returns to the flowchart of FIG. 16, and returns to the mode determination flowchart of FIG. 15 through (1)-(1). Therefore, in the flow that follows, the determination of (MS) = 0 and the determination of (MN) = 0 are passed through as NO, so after moving to subroutine SUB1, the apex operation {(MBn) + (M2) - (M5
)} is performed, and the calculation result value (MSn) is displayed in points. At this time, n=2, so the seventh,
As shown in Figure 8, the point display is (MS2). Subsequently, an arithmetic average of the shutter time values TV is performed, and after this is stored in the shutter time value storage memory M7, this average value is displayed on the display device 27 as the seventh
, 8 is displayed as a bar as shown in Figure 8.

Note that the shutter time value (M7) differs depending on whether the correction value CV stored in the memory M3 is C1 at this time, and if (M3)≠C1, the subroutine SUB
In 2, the judgment of (M3)=C1 is passed as no, so
As shown in FIG. 8, a "+-" correction is displayed.

In this way, each time the photographer operates the spot input button and turns on the spot input switch SW1, the contents (MN) of the spot input number memory MN are changed to 1, 2, 3, etc.
・Then, each time a new spot brightness value is input, the apex calculation of the shutter speed value corresponding to each spot brightness value is performed {(MBn)+(M2)
-(M5)} is redone, each shutter second value is stored in the point display memory MSn (n=1 to N), and each of these shutter second values (MSn) is
The display device 27 displays points. Then, the shutter time values corresponding to each of the spot brightness values are added and averaged, and a correction value is added thereto. This result is stored in the shutter time value storage memory M7, and the average shutter time value is Second hour value (M7
) is displayed as a bar on the display device 27.

From this point on, the spot brightness value currently being measured will be input.
The corresponding shutter time value (MT) is displayed as a scanning point, but as mentioned above, this point display moves when the camera is moved or the brightness of the subject changes, so the previously input spot brightness It can be distinguished from the point display of the shutter second value (MSn) corresponding to the value.

In this way, the contents of the spot input number memory MN (MN)
Spot input can be performed until the value reaches '10', and the point display of the shutter time value corresponding to the 10 spot brightness values from maximum (MS1) to (MS10) can be performed, and the arithmetic average can be displayed. Values can be displayed as bars.

Now, (MN) = 10, and in order to perform the 11th spot input, when spot input switch SW1 is turned on, after passing the judgment of I4 = 0 as YES,
Exit the judgment of (MS) = 0 with YES and enter the subroutine SU
The process moves to B3, and {(MN)+1}=11 is stored in the memory MN, so the determination of (MN)=11 is passed as YES. Therefore, the calculation {(MN)-10}=1 is performed, and the resulting value "1" is stored in the memory MN. That is, (MN)=1 with the 11th spot input. Thereafter, the latest spot brightness value BV is stored in the brightness value storage memory MB1, which corresponds one-to-one with the number of spot inputs (MN)=1. Therefore, in the flow that follows, the memory MS
The shutter time value (MS1) of No. 1 is updated, and this updated shutter time value (MS1) is displayed as a point. Therefore, in subsequent calculations as well, addition and averaging including the updated shutter time value (MS1) is performed, and the calculation result value is stored in the memory M7 and displayed as a bar. 12
When subsequent spot inputs are performed, they are performed in the same manner as above, and each time a spot input is performed sequentially, the shutter time value corresponding to the old spot brightness value changes to the shutter time value corresponding to the latest spot brightness value. The point display and bar display are also updated.

Here, press the clear button and clear switch SW2
When turned on, in the flowchart for mode determination shown in FIG. 15, the determination of I5=0 is passed as YES, so '0' is stored in the spot input number memory MN and the memory MN is initialized. So, after this, the first
In the flowchart of FIG. 6, when the determination of I4=0 is passed with a NO, the spot input detection flag MS is also initialized, and then the determination of (MN)=0 is passed with a YES, and therefore, on the display device 27, ( The point display of MSn) and the bar display of (M7) disappear, and only the aperture setting value (M6) and the point display of the shutter time value (MT) corresponding to the spot brightness value currently being metered are displayed. (See Figure 5).

Next, when the release switch SW4 is turned on by the suppression operation of the shutter release button, in the exposure control flowchart shown in FIG. )
} is performed, and the calculated result value is stored in the aperture control value storage memory M9. Memory M8 stores the set aperture value (M6
)=AVO+ΔAV is stored, and since the open aperture value AVO is stored in the memory M4, the set aperture value ΔAV from the open aperture set by the rotation of the aperture ring 1 is stored in the memory M9 by the above calculation. That will happen. Thereafter, the shutter time value (M7) is set in the timer counter. Then, output port O6 becomes '1'
', the aperture drive circuit 47 operates, and therefore,
The coil 7 of the electromagnet Mg3 is energized, and the aperture blade drive ring 6 rotates to rotate the aperture blades 9 to perform narrowing down. Then, the variable resistance R that changes depending on this narrowing down
The actual aperture change value AVC due to V7 is stored in memory M10. This narrowing down is performed until (M10) = (M9), and when (M10) = (M9), this judgment is passed with a yes, so after this, output port O7 becomes '
It becomes 1'. When the output port Q becomes '1', the aperture stop circuit 48 operates, and therefore the electromagnet Mg4 becomes energized and attracts the engaging member 10, causing the engaging member 10 to be connected to the gear 6b of the aperture blade drive ring 6. to stop rotation of the aperture blade drive ring 6. This narrows down the range to (M10) = (M
Stop at 9). Subsequently, after the output port O6 becomes '0' and the aperture drive circuit 47 becomes inoperable and the power supply to the coil 7 of the electromagnet Mg3 is turned off, the output port O4 becomes '0'.
1', the shutter front curtain drive rotation 45 is operated. When the shutter front curtain drive circuit 45 becomes operational, the shutter front curtain restraining electromagnet Mg1 becomes energized and releases the front curtain restraint, so that the front curtain begins to run. after this,
Subsequently, a determination of I3=1 is made. When the shutter front curtain starts running, the trigger switch S of the trigger delay circuit
Since W5 is open, the current that charges capacitor C0 flows through capacitor C0 and variable resistor RV9, so that the voltage at the inverting input terminal of comparator A6 becomes higher than the voltage at the non-inverting input terminal until capacitor C0 is charged. Input port 13 is '0'. After a certain delay time determined by resistors R1, R2, capacitor C0 and variable resistor RV9, the output of comparator A6 is inverted and input port I3 becomes '1'. This time is the exposure start time, and if the determination of I3=1 is YES, the timer counter to which the shutter time value (MT) is set starts to operate. The shutter seconds value of the timer counter counts down, and the count value of the timer counter becomes '
When it becomes 0', the determination of timer counter=0 is passed as YES, the output port O9 becomes '1', and the shutter trailing curtain drive circuit 46 operates. Then, the electromagnet Mg2 for restraining the shutter trailing curtain becomes energized and releases the restraint of the trailing curtain, so that the trailing curtain starts running. This completes the exposure operation, and after a certain delay time, the output ports O4, O5, and O7 become 'O', and the shutter front curtain drive circuit 45, shutter rear curtain drive circuit 46, and All the aperture stop circuits 48 become inactive and return to their initial state. When the aperture stop circuit 48 becomes inoperable, the electromagnet Mg4 releases the attraction of the engagement member 10, so that the engagement member 10 and the aperture blade drive ring 6 are disengaged, and the aperture blade drive ring 6 is moved by the spring 13. The diaphragm blades 9 are rotated to the initial position, and the diaphragm blades 9 perform a rotational return to fully open the diaphragm (see FIG. 1). After this, the process returns to the mode determination flowchart shown in FIG. 15 through (1)-(1), but unless the shooting mode selection switch SW3 is switched,
A. mentioned above. The A mode program operation is repeated.

(B)T. When A (shutter priority auto shooting) mode is selected.

Next, set the shooting mode selection switch SW3 to T. When connected to contact b of A mode, the mode determination flowchart shown in FIG. 15 passes through the determination of I7=0 as YES, and
Through (3)-(3), the T. The process branches to the A-mode flowchart. In addition, this T.
At the same time as the A mode is switched, the display device 27 basically displays the aperture indicators "16" to "14" as shown in FIG. This T. In the A-mode flowchart, first, it is determined that (MC)=T. 'T
' is T. This is a unique value depending on the A mode. At this time, if the content (MC) of the mode detection memory MC is not 'T', the current T. Assuming that the A mode has just been selected, the determination of (MC)=T is passed as NO, '0' is stored in the spot input number memory MN, and 'T' is stored in the memory MC. After storing 'T' in the memory MC, the process exits from the second flow with a YES decision.

Next, a determination is made that I4=0, and at this time, if the spot input switch SW1 has not been turned on at all, this determination is passed as NO and '0' is stored in the spot input detection flag MS. Thereafter, the determination of (MN)=0 is passed as NO and the process moves to subroutine SUB1. After various types of photographic information are introduced as described above in subroutine SUB1 (see Fig. 20), (M1)
Since the shutter time value TV to which the variable resistor RV3 is set is stored in the memory M1 in which the display is performed, the shutter time value (M1) in this memory M1 is displayed on the display device 27. For example, if the set shutter second time range (M1) is "1/125 (S)", the shutter time index display on the display device 27 will be "125" as shown in FIG. only is displayed.

Subsequently, after going through the correction display subroutine SUB2 (see FIG. 21), the spot brightness value BV is stored in the memory MB, and then the spot brightness value BV stored in this memory MB and the spot brightness value BV are stored in the memory M2. Apex calculation of the film sensitivity value SV and the set shutter speed value TV stored in the above memory M1 {(MB) + (M2)
-(Ml)} is performed, and the aperture value AV as the calculation result value is stored in the scanning point display memory MF. Then, this aperture value (MF) is displayed as a point on the display device 27 as shown in FIG. 9, and the point display moves in the horizontal direction according to the spot brightness value currently being photometered. After the scanning point is displayed, the shutter speed per second (M1) is transferred to the shutter speed per second value storage memory M7, and then the process branches to the exposure control flowchart shown in FIG. 19 through (5)-(5). , in the flowchart of FIG. 19, if the shutter release has not been performed at this time, the determination of I90 is passed through as NO, and the process returns to the mode determination flowchart of FIG. =0 is passed with a yes, and through (3)-(3), the T.
Shift to the A mode flowchart.

Next, when the spot input switch SW1 is turned on, after passing the above judgment of I4=0 as YES, (MS)=
A determination of 0 is made. When the spot input switch SW1 is turned on for the first time, '0' is initially stored in the spot input detection flag MS, so this judgment is passed with a yes, and the process moves to subroutine SUB3 where the spot input number memory MN is stored. and updates the above flag MS (
(See Figure 22).

By passing through this subroutine SUB3, (M
N)=1, (MS)=1, (MB1)=BV.

After this subroutine SUB3, the process returns to the mode determination flowchart of FIG. 15 through (1)-(1), and then through (3)-(3) described above. Since the flowchart for A mode is entered, at this time, (MS
) = 0 and (MN) = 0 are both passed as NO.

If the judgment of (MN) = 0 is passed with no, after running the subroutine SUB1, the abex operation {(MBn) + (
M2)-(M1)} is performed. (MBn)=(MB
1)=BV, M2=SV, (m1)=TV, so
This calculation result value (BV+SV-TV) is stored in the point display memory MSn=MS1. Then, the squeeze print (MS1) in this memory is displayed as a point on the display device 27 (see FIG. 10). Since only one point (MS1) is displayed by this spot input, the subsequent averaging calculation is {(MS1) + (M3)}, which is transferred to the aperture value storage memory M8 and stored in the same memory M8. The content (M8) is displayed as a bar on the display device 27. If exposure compensation is not performed at this time, the display state will be such that the aperture value (MS1) in the point display and the aperture value (M8) in the bar display match, as shown in FIG. After the bar display of the aperture value (M8), as mentioned above, after going through subroutine SUB1, the set shutter time value (M1) is displayed numerically, and then, through subroutine SUB2, the spot brightness value is displayed. BV is introduced into the memory MB, and further apex calculation {(MB)+(M2)-(M1)} is performed, and the resulting aperture value (MF) is displayed at the scanning point (see Figure 10). . Thereafter, the shutter time value TV stored in the memory M1 is transferred to the memory M7.

This T. Even in A mode, A. As in A mode,
While the above spot input switch SW1 continues to be on, after passing the I4=0 judgment with a yes, (MS)=0.
, (MN)=0 are passed as NO, so the display state on the display device 27 is as shown in FIG. Then, when the spot input switch SW1 is turned off from this state, the determination of I4=0 is passed as a NO, so after the flag MS is initialized to '0', the determination of (MN)=0 is passed as a NO. The program exits and the above program operation is performed. Next, spot input switch S again
When W1 is turned on, the flow at this time is to exit the judgment of I4 = 0 with a yes, then exit the judgment of (MS) = 0 with a yes and move to subroutine SUB3, so in this subroutine SUB3, (MN) = 2, (MS)=1,
(MB2)=BV. Therefore, after this, (1)-
When returning to the flowchart for mode determination through (1) and further transitioning to the flowchart in FIG. 17 through (3)-(3), it is determined that (MS) = 0, (MN) =
Exit all 0 judgments as NO and proceed to the subroutine SUB
After passing through 1, the apex operation {(MB2) + (M2)
-(M1)} is performed, this calculation result value AV is stored in the point display memory MS2, and the aperture value AV=(MS2) in this memory is displayed as a point on the display device 27 (see FIG. 11). ). That is, at this point, the point display by spot input is
1) and this point display (MS2). After this, the aperture values obtained from each spot input are averaged by the apex calculation, and this calculation result value is stored in the aperture value storage memory M8.
The contents of the memory M8 (M8) are transferred to the display device 2.
A bar is displayed at 7. At this time, as shown in Fig. 11, for example, if exposure compensation is not performed, the average value of the aperture value (MS1) and (MS2) in the point display becomes the aperture value (M8) and is displayed as a bar. . If exposure compensation is performed at this time, the above A. As explained in the A-mode flowchart, subroutine SUB2 (21st
In order to pass the determination of (M3)=C1 as NO, "+-" is displayed on the display device 27 (see figure 8).
(see figure) and a bar display that takes into account the correction value.

Thereafter, in the same way, each time the photographer operates the spot input button to turn on and off the spot input switch SW1 and performs a spot input, the number of spot inputs (MN) increases by one, and each spot The subject brightness values BY are stored in the memories MB1, MB2, MB3,...MBn,...
They are sequentially stored in MBN. Then, each time a new spot brightness value is input as a spot, the aperture constant apex calculation {(Bn) + (M2) - (M1)} corresponding to the subject brightness value (MBn) of each spot is redone. , and the resultant values (MSn) are sequentially displayed as points on the display device 27. Then, the aperture values corresponding to each spot brightness value are added and averaged, and the resultant value obtained by adding a correction value to this value is stored in the memory M8, and this average aperture value (M8)
is displayed as a bar on the display device 27. thus.

The content (MN) of the spot input number memory MN is '10'
You can perform spot input until the maximum (M
From S1) to (MS10), the aperture values corresponding to the 10 spot brightness values can be displayed as points, and the aperture values obtained by adding and averaging these values can be displayed as a bar.

Now, by turning on and off the spot input switch SW1 10 times, the number of spot inputs (MN) = 10.
When the spot input switch SW1 is further turned on in order to perform the 11th spot input when A. As explained in the A mode program operation,
The spot brightness value input for the 11th spot is stored in memory M.
Stored in B1. That is, after the spot input switch SW1 is turned on and the judgment of I4=0 is YES, the process moves to subroutine SUB3 (see Figure 22, where (MN)=11 first, so this judgment is YES). When it exits, (MN)=1, and then (MS)=1, and then the memory M corresponding to this (MN)=1
The brightness value spot-input to B1 is stored. Therefore, in the subsequent repeated flow, (MS)=0,
If each determination of (MN)=0 is passed as NO, the aperture value corresponding to the 11th spot brightness value is determined by the point display memory MS1 in which the aperture value corresponding to the 1st spot brightness value is stored. It will be stored in the same memory MS.
The aperture value of 1 (MS1) is updated. Therefore, the aperture value (
Since the point display of MS1) is also updated to the aperture value according to the latest 11th spot brightness value, the subsequent calculation result value (M8) is also updated, and this updated average aperture value (M
8) is displayed as a bar. When the 12th and subsequent spot inputs are performed, they are performed in the same manner as above, and each time a spot brightness value is input sequentially, the aperture value corresponding to the old spot brightness value is changed to the aperture value corresponding to the latest spot brightness value. The point and bar displays are also updated.

Further, after the spot brightness value is input by the member of the spot input switch SW1, K, who wants to clear the input spot brightness value, suppresses the clear button and turns on the clear switch SW2.

When clear switch SW2 is turned on, A. As mentioned in the A mode, in the mode determination flowchart of FIG. 15, the result is YES for I5=0, so the spot input number memory MN is initialized and (MN)=
It becomes 0. Therefore, after moving to the flowchart in FIG.
Since S is also initialized and the judgment of (MN) = 0 is passed with a yes, the point display of (MSn) and the bar display of (MS) disappear on the display device 27, and the set shutter speed value ( A state is reached in which only the display of M1) and the point display of the aperture value (MF) corresponding to the spot luminance value currently being photometered are performed (see FIG. 9).

Next, the above T. After performing spot input in A mode, when the shutter release button is depressed, the release switch SW4 is turned on, and in the flowchart of exposure control 1 shown in FIG. (M8)-(M1)} is performed, and the resultant value of the apex calculation is stored in the aperture control value storage memory M9. That is, at this time, the aperture value necessary for aperture control, starting from the open aperture value, is stored in the memory M9. Thereafter, the set shutter time value (M1) transferred to the memory M7 is set in the timer counter. Subsequently, since the output port O6 is set to '1', the aperture drive circuit 47 operates, and therefore the coil 7 of the electromagnet Mg3 becomes energized, and the aperture blade drive ring 6
rotates to rotate the diaphragm blades 9, thereby performing narrowing down. Variable resistance R that changes depending on this actual narrowing down operation
The actual aperture change value AVC due to V7 is stored in memory M10. The rotation of the aperture blade drive ring 6 against the rotational behavior of the spring 13 due to the energization of the coil 7 is (M
The aperture is narrowed down until (M10) = (M9), and when (M10) = (M9), this judgment is YES and the exit is made, and the output port O7 is set to '1' and the aperture stop circuit 48 works. When the aperture stop circuit 48 is in operation, the electromagnet Mg4 is energized and attracts the engaging member 10, and the engaging member 10 stops the rotation of the aperture blade drive ring 6. Subsequently, after the output port O6 is reset to '0' and the aperture drive circuit 47 becomes inactive, the output port O4 is set to '1' and the shutter front curtain drive circuit 45 is activated, so that the shutter Leading curtain restraint electromagnet Mg
1 releases the restraint state of the leading curtain and causes the leading curtain to run. After this, a determination is made that I3=1, so after a certain time delay after the trigger switch SW5 is turned off due to the start of front curtain travel, the output of the comparator A6 is inverted and I3
The timer counter starts operating when the value becomes 1 (exposure start). The shutter second value (M7) = (M1) set in the timer counter counts down, and when the count value reaches '0', the output port O5 changes to '1'.
', the shutter trailing curtain drive circuit 46 operates, the trailing curtain restraining electromagnet Mg2 releases the trailing curtain restraint, and the trailing curtain starts running. As a result, the above T. After the exposure operation in mode A ends, after a certain period of time, the output ports O4, O5, and O7 are each reset to '0', and the shutter front curtain drive circuit 45, shutter rear curtain drive circuit 46, and aperture stop circuit are reset. 48 return to their inactive state. After this, the flow returns to the mode determination flowchart shown in FIG. 15 through (1)-(1), and therefore, unless the photographing mode selection switch SW3 is switched, the above-mentioned T. The A mode program operation is repeated.

(C)P. When A (program auto shooting) mode is selected.

Next, set the shooting mode selection switch SW3 to P. When connected to contact c of A mode, in the mode determination flowchart shown in FIG.
Through (4)-(4), the P. The process branches to the A-mode flowchart. In addition, this P.
At the same time as the A mode is switched, the display device 27 basically displays an aperture index of "16" to "14" and a shutter speed index of "2000" to "4" as shown in FIG. Is displayed. In this basic display, the aperture index display and the shutter speed index display are a combination display that satisfies the program characteristic line shown in FIG. 23. This P. In the A-mode flowchart, first (
MC)=P is determined. 'P' is P. This is a unique value depending on the A mode, and at this time, P. If the A mode has just been selected, the determination of (MC)=P is passed as NO, and after initializing the spot input number memory MN, 'P' is stored in the mode detection memory MC. If 'P' is stored in the memory MC, from the second flow onwards, the determination of (MC)=P will be YES.

Subsequently, a determination is made that I4=0, and if the spot input switch SW1 has not been turned on at this time, the determination is passed as NO, and (MS) is initialized to 0, and (MN) Exit the =0 judgment with yes and go to subroutine S
After the spot brightness value BV is introduced into the memory MB via UB1 and subroutine SUB2, the spot brightness value BV introduced into this memory MB, the film sensitivity value SV stored in the above memory M2, and the above memory M4 are stored. An apex calculation is performed on the aperture value AVO, and a negative time value TV as a result of this calculation is introduced into the scanning point display memory MP. Here, to explain the above calculation formula, spot brightness value (MB) = BV is the amount of light that has passed through the open aperture, so if the subject brightness value is BV0, then
From the above formula (1), BV0+SV=TV+AV=EV(1
)′, and by substituting the above equation (2) into this, we get BV+
SV+AVO=TV+AV=EV(5). Also,
According to the program characteristic line shown in Fig. 23, the relationship between the shutter speed value TV and the aperture value AV is determined as TV=2(AV-2)(6). 5) Substituting the formula, we get . Subsequently, the shutter time value TV (MP) obtained by the above calculation is displayed on the display device 27 at the 12th
Points are displayed as shown in the figure. This point display of the shutter time value (MP) can be done by moving the camera,
The subject moves in the direction of the arrow as the brightness of the subject changes. After the points are displayed, the 19th
In the flowchart of FIG. 19, if the shutter release has not been performed yet, I9=
Passed the 0 judgment with a no, and passed through (1)-(1) to the 15th
Returning to the mode determination flowchart in the figure, further I8=
Pass the 0 judgment with a yes and go through (4)-(4) to the first
P.8 shown in Figure 8. Shift to the A mode flowchart.

Next, when the spot input switch SW1 is turned on, the A. A mode, T. As mentioned in the A mode, at the beginning of the ON state of the switch SW1, after passing through the judgment of I4=0 with YES, passing with the judgment of (MS)=0 with YES, flowing through subroutine SUB3, and spotting. The number of inputs (MN) is updated, the flag MS is set, and the spot brightness value BV is stored in the memory MBn in one-to-one correspondence with the number of spot inputs (MN). After this, the process returns to the mode determination flowchart shown in FIG.
Each of the determinations of S)=0 and (MN)=0 will be passed as NO. When the spot input switch SW1 is turned on, the judgment of I4=0 is passed as no, and the flag MS becomes '0'.
', so next spot input switch S
When W1 is turned on, after passing through the I4=0 judgment with a yes, passing through the (MS)=0 judgment with a yes, the jib routine SUB3 is flown, and the number of spot inputs (MN) is updated again and the flag is executed. The MS is set and the spot brightness value BV is stored in the memory MBn. Then, in the repeated flow after this, again (MS)
=0, (MN)=0, the result is NO. (MN)=
To pass the 0 judgment with a no, set the spot input switch SW1 to 1.
This is when you turn it on more than once. A. A mode, T. As in the case of A-mote, points are displayed on the display device 27 according to the number of spot inputs. That is, the above (M
If you pass the judgment of N) = 0 with no, then the subroutine S
After passing through UB1, an apex calculation is performed, and the result of this calculation is stored in the shutter time value TV or point display memory MSn. As described above, the above calculation formula is also determined by the program characteristic line shown in FIG. The shutter second time value TV (MSn) obtained by this calculation is displayed at the 13th and 14th points on the display device 27.
Points are displayed as shown in the figure. Figure 13 shows (M
When N) = 1, only the shutter time value (MS1) corresponding to the 10th spot brightness value is displayed as a point, and in Fig. 14, when (MN) = 2, the 1st and 2nd spots Shutter seconds value (MS1), (MS
2) shows a state where the point is displayed. After that, calculation of the addition average is performed, and the calculation result value is stored in the shutter speed value accurate memory M7, and the shutter speed value (M7) in the memory M7 is displayed as a bar on the display device 27. be done. At this time as well, if exposure compensation is not performed and (MN) = 1, the point size and bar display will display the same shutter speed value as shown in Figure 13, and ( If MN)=2, as shown in FIG. 14, the bar display displays the shutter time value that is the average of the shutter time values of the two point displays.

Subsequently, an apex calculation {(M7)/2+2} is performed from the above-mentioned shutter speed value (M7), and this calculation result value is stored in the aperture value storage memory M8. This arithmetic expression is obtained from the above equation (6) determined by the program characteristic line shown in FIG. 23 as AV-TV/2+2(6)'.

In this way, up to the number of spot inputs (MN) = 10, shutter seconds (MSn) (n =
1 to N) and a bar display of the shutter time value (M7) obtained by adding and averaging these points, and also displaying the aperture value ( MB) is required. When the number of spot inputs (MN)=11, the above-mentioned A. A mode, T. As in A mode, the calculation {(MN)-10} is performed in subroutine SUB3,
This will be stored in the memory MN, and the spot brightness value BV at that time will be stored in the memory MB1 corresponding to (MN)=1. Therefore, if the number of spot inputs exceeds 10, Up to 10 points are displayed corresponding to each memory MSn (n=1 to 10), but the shutter time value corresponding to the 11th spot brightness value is the same as the shutter time value corresponding to the 1st spot brightness value. The shutter time value will be stored in the point display memory MS1 where it is stored, the shutter time value (MS1) in the same memory MS1 will be updated, and the point display will also be the latest spot brightness of the 11th spot mentioned above. The shutter time value will be updated according to the value. Therefore, the averaged shutter time value (M7) is also updated, and the bar display is performed based on this updated shutter time value. The aperture value (M8) is also updated. Even when the 12th spot and subsequent spots are input, in the same way as above, each time the spot brightness values are input sequentially, the shutter speed value corresponding to the old spot brightness value is changed to the shutter time value corresponding to the latest spot and brightness value. It is replaced by the shutter speed value, the point display and bar display are updated, and the aperture value is also updated.

Further, after inputting a spot brightness value using the spot input switch SW1, in order to clear the input brightness value, it is sufficient to turn on the clear switch SW2.

In this case as well, A. A mode, T. As mentioned in the A mode, in the mode determination flowchart of FIG.
Since the determination of I6=0 is passed with a yes, (MN)=0. Therefore, since the determination of (MN)=0 in FIG. 18 is passed with a yes, the point display of (MSn) and (M7 ) bar display disappears, and the shutter time value (
Only the scanning point of MP) is displayed (see FIG. 12).

Next, the above P. After performing a spot input in A mode, when the shutter release button is depressed, the release switch SW4 is turned on, and in the exposure control flowchart shown in FIG. (M8)-(M4)}, and the resulting value is stored in the aperture control value storage memory M9. This memory M9 stores aperture values from the maximum aperture necessary for aperture control. Thereafter, the shutter time value stored in the memory M7 is set in the timer counter. Next, output port O6
is set to '1', the aperture drive circuit 47 rotates the aperture blade drive ring 6 to perform aperture narrowing down, and the actual aperture change value AVC by the variable resistor RV7, which changes due to this actual narrowing down operation, is stored in the memory M10. be done. When (M10)=(M9), this judgment is passed as YES, the output port O7 is set to '1', and the electromagnet Mg4 is energized by the aperture stop circuit 48 to rotate the aperture blade drive ring 6. to stop filtering. Subsequently, after resetting the output port O6, the output port O4 becomes '1'.
' When the shutter front curtain starts running, the judgment of I3=1 becomes YES after a certain time delay after the trigger switch SW6 is turned off, so the timer counter is set from this point (exposure start point). The shutter time value (M7) is counted down, and when the count value reaches '0', the output port O5 is set to '1' and the trailing curtain starts running. By running this trailing curtain, the above-mentioned P. After the A mode exposure operation is completed and a certain period of time has passed, the output ports O4 and O
5 and O7 are reset, the process returns to the mode determination flowchart shown in FIG. 15 through (1)-(1). Therefore, unless the shooting mode selection switch SW3 is changed, the above-mentioned P. The program operation in mode A is repeated. In each of the above auto shooting modes, when determining the shutter time value and aperture value that serve as exposure control values, the shutter time value is calculated according to each spot brightness value of multi-point input. It is not limited to the calculation formula that simply adds and averages the aperture value and the aperture value. For example, it can be calculated using the root mean square calculation formula, or it can be calculated according to the brightness value shifted several steps based on the maximum or minimum spot brightness value. It may also be a method for determining the shutter speed value or aperture value.

Furthermore, in this embodiment, the number of spot brightness values that can be held at the same time is 10, and the 10 spot brightness values inputted in time series are stored in circulation, with one cycle being stored. However, the maximum number of items that can be held can be set to an appropriate number depending on the capacity of the memory.

Further, the photometry mode is not necessarily limited to the spot photometry mode, and the multi-point photometry method of the present invention can also be adopted, for example, in the average photometry mode and the center-weighted photometry mode. In this case, the photodetector PD for spot photometry
Instead, a light-receiving element for average photometry or a light-receiving element for center-weighted photometry may be used.

As described above, according to the present invention, the subject brightness values at desired locations measured by the memory photometer are inputted at appropriate times, and predetermined calculations are performed on these plurality of subject brightness values to perform various automatic shooting. Since exposure can be controlled in this mode, it is possible to provide an automatic exposure camera that can take pictures that fully reflect the photographer's intentions.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of an electromagnetic diaphragm mechanism within a camera barrel of an automatic exposure camera of the present invention. FIG. 2 is a side view of essential parts showing the optical system of the automatic exposure camera of the present invention. FIG. 3 is an electrical circuit diagram showing an embodiment of the automatic exposure camera of the present invention. FIG. 4 is a block diagram showing the internal configuration of the microcomputer as the central processing unit in FIG. 3 above. FIGS. The enlarged front views shown in FIGS. 15 to 23 are flowcharts showing the programs in the microcomputer shown in FIG. 4, respectively. PD... Light receiving element for spot photometry SW1...
... Spot input switch SW2 ... Shooting mode selection switch BV ... Spot brightness value MC ... Mode detection memory MB, MBn ... Spot brightness value storage memory MSn.
... Point display memory MN ... Spot input number memory MS ...
...Spot input detection flag M1...Setting shutter second time storage memory M4...Open aperture value storage memory M5...Setting aperture value storage memory M
6... Setting aperture value storage memory MT, MF, MI
・Scanning point display memory M7... Shutter seconds value storage memory M8... Aperture value storage memory M9... Aperture control value storage memory M10...
・Actual aperture change value storage memory patent applicant: Olympus Optical Industry Co., Ltd. Agent: Nanabe Fujikawa'). Line 5, /27 Horse 6, 7, 8, 39, 10, 11 flash% 19, horse 20 ■, Mo 23, 4-3-2-101234567891011
Continued Supplement 11-Written (Spontaneous) April 221, 1980” Special 1〆F I-'I length'1-f Flower 2 (Yoshikazu Daidono 1Uf↑L)) Large and small 1988 Submission Application No. 450
87 M2 Invention Name J＼ Automatic exposure power Meshiro Sode 11- Nagisa! Jif! Relationship with l 'lL1/■Applicant ill'l
(J11) 1 ↓ Hatariichiya 2-chome, Shibuai-ku, Tsunto [43]
Name 4iB ([,] Rono) Orin Kusu Optical Industry Stock Representative Association 114 Representative Person 1) 1s1 Medium+:! , 61; Hffi it+row i% Matsubara 51"1J527i+F14 name
(1655) River Seven Part (I
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Figure 26 (Program O 1. Photo request 7) is a log sim city record.-1 1, (4) Attach the application form to *1iii (7) Part 2
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Claims (2)

[Claims] (1) Sequentially measure the subject brightness at a desired photometric point using a memory-type photometric means, and perform a predetermined calculation based on the multiple pieces of subject brightness information obtained thereby and a preset shutter time value. An automatic exposure camera characterized in that an aperture value is calculated based on a formula, and the aperture value is transmitted to an aperture control means to perform exposure control so that the amount of exposure to the film surface is appropriate. (2) The subject brightness at the desired photometry point is sequentially measured by the memory-type side light means, and the shutter time value and aperture value are calculated based on the calculation formula of the predetermined program characteristics from the plurality of subject brightness information obtained thereby. An automatic exposure camera characterized in that the calculated result value is transmitted to an exposure control means to perform exposure control so that the amount of exposure to the film surface is appropriate.