JPS60258523A - Exposure controller of camera - Google Patents

Abstract

PURPOSE:To make it possible to take continuously pictures different in aperture and shutter effects by increasing one of an aperture opening value and an exposure time by change data and reducing the other by the same change data with respect to the combination for correct exposure between the aperture opening value determined in accordance with a light measured value and the exposure time and performing continuous photographing. CONSTITUTION:The axis of abscissas is taken in the direction of the aperture value, and the axis of ordinates is taken in the direction of the exposure time. If the measured result of a photometric circuit 40 is 11 aperture value and (1/ 125)sec exposure time, this point is P5, F5, and T5. An EV value at this time is 14. The first mode (P mode) out of three kinds of mode is a multiframe photographing mode where the aperture value and the exposure time are changed while keeping the EV value constant to photograph continuously, and a maximum of nine frames from P1 to P9 along the oblique line of EV=14 are photographed. In the second mode (F mode), the aperture value is changed while keeping the exposure time constant (1/125)sec in this example) to photograph successively. Thus, a fluctuating object is photographed surely in accordance with user's composing intension without losing shutter release opportunities.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exposure control value conversion device that allows selection of a combination of aperture aperture value and exposure time while maintaining standard exposure.

Conventionally, a device has been proposed in which the standard or appropriate exposure signal obtained by metering the light from the subject is shifted by one step to the over side, and this is fed to the exposure control circuit to perform overexposure. .

However, with these devices, for example, when photographing a plurality of frames of the same subject with different exposure amounts, it is necessary to re-set the exposure multiple for each photograph, making the operation cumbersome and lacking in speed. On the other hand, US Patent No. 37 has the effect of eliminating this trouble and improving the operability of the camera.
In No. 62285, a device that automatically changes the exposure one step at a time for three consecutively photographed frames. (B) A device that allows photography to be performed with one step underexposure, appropriate exposure, and one step overexposure. is proposed. However, no apparatus has been proposed in the past that can continuously take pictures with different combinations of aperture aperture and exposure time while maintaining standard or proper exposure.

The requirement to take multiple shots of the same subject with different combinations of aperture aperture and exposure time under conditions of appropriate exposure means that even under conditions of appropriate exposure, the difference in combination of aperture and exposure time causes Although the effects are different, it is difficult to judge which combination best suits the photographer's intentions in the current situation, so it is difficult to judge which combination best suits the photographer's intentions. It comes from taking photos in various ways, looking at them, and choosing the best one. In this case, manually changing the aperture and shutter speed to take pictures would take too much time, and there is a high risk of losing the camera opportunity during that time, so it is recommended to combine continuous shooting with a motor drive, etc. It is desirable to be able to shift the aperture and exposure time as described above.

From the above-mentioned viewpoint, it is an object of the present invention to provide a camera that can sequentially and continuously perform a plurality of photographing operations with different combinations of aperture aperture value and exposure time under appropriate exposure conditions.

According to the present invention, for the appropriate exposure combination of the aperture aperture value and exposure time determined according to the photometric value, one is increased by the amount of changed data and the other is decreased by the same amount, and the changed data is sequentially changed while continuing. Since I started taking pictures, I was able to take consecutive photos with different aperture and shutter effects, and I was able to avoid missing camera opportunities for changing subject areas, and ensure that my intentions were met. You can take matching photos.

The present invention will be explained in detail below with reference to Examples. FIG. 1 shows the overall configuration of an embodiment of the present invention. In this figure, the upper part surrounded by chain lines is the circuit installed in the camera body, and the lower part is the circuit installed in the winder that is attached to and detached from the camera body.When the winder is attached to the camera, both The circuits are interconnected by terminals 66-75. The figure shows this connected state. 40 is a photometry circuit within the camera that outputs a set exposure control value or an exposure control value corresponding to the subject light. The output of the photometric circuit 40 is sent to the arithmetic circuit 42.
A predetermined calculation is performed according to the shooting mode selected at the time of shooting, and the calculation result is output to the exposure control circuit 44.
°C exposure control is performed by the operation of the exposure control circuit. Information on the photographing mode necessary for calculation operations in the calculation circuit 42 is stored in advance in the storage circuit 41 by a setting operation during shooting, and the control circuit 45 reads out information from the storage circuit and performs calculations according to a control program stored within the control circuit 42. The circuit 42 is driven.

43 is a display device that displays the output of the arithmetic circuit 42.

The selection and setting of the photographing mode is performed by a circuit provided in the winder. The shooting modes that can be selected by the device of this invention are 1 shot, 2 shots under the same exposure setting, and 5 shots.
Single-shot, continuous-frame shooting, and exposure control value conversion modes (hereinafter referred to as IA)
In addition to the seven modes (referred to as A mode), the A mode includes three types of modes. The contents of these three types of modes are shown in FIG. In this figure, the horizontal axis represents the aperture value, and the vertical axis represents the exposure time. Assume that the photometry result by the gold-side optical circuit 40 is that the aperture value is 11 and the exposure time is 1/125 seconds. This point is explained in P5. F5
．． This is the point T5. The EV value at this time is 14. The first mode (referred to as P mode) of the above three modes is a multi-frame shooting mode in which shots are taken sequentially by changing the aperture value and exposure time while keeping the EV value constant.
On the diagram, along the diagonal line of EV=14, the aperture value is 22. From point P1 to P2 with an exposure time of 1/30 seconds. A maximum of nine frames (any number of frames from PI to P9 can be selected) from P3 to P9 are photographed. The second mode (called F mode) has a constant exposure time (l/125 seconds in the example in Figure 3).
What is the aperture value shown in Figure 3 in multi-frame shooting mode in which images are taken one after another while changing the aperture? 22. Exposure time 1/125
Up to 9 pieces from the second Fl point to the T9 point (of course F1
to F9). The third mode (called T mode) takes multiple frames while keeping the aperture constant and changing the exposure time. In the example in Figure 3, the aperture is set to 11 and the exposure time is 17500.
You can shoot up to 9 frames from T1 point to 19 seconds (
Any number of points can be selected from T1 to T9).

Setting of the above-mentioned photographing mode is carried out by block 2. which is the mode selection setting circuit in the circuit of FIG. block 3 and switch 1
3 to 21. Block 2 is the number of shooting frames (
1 to 5 frames, continuous frame shooting, ) and A mode are selected and set, and the setting mode is expressed in binary code and connected to terminals 59 to 59.
61 and 23. The relationship between the photographing mode and the binary code is shown in the table on the next page.

(See next page) Block 3 includes three modes included in A mode: P,
By selecting and setting three modes, F and T, the set mode is output as a binary code to terminals 62 and 63. The relationship between this mode and binary code is shown in the following table.

Switches 13 to 21 are switches for setting which exposure point to select in A mode.

That is, as explained in FIG. 3, P belonging to A mode
, F, and T modes allow up to 9 frames to be photographed with various exposure settings.For example, if switch 13 is pressed, only 21 points, F'1 point, or T1 point will be photographed out of these 9 frames. By pressing switches 15 and 17, two frames, 23 and 25 points, T3 and T5, or T3 and T5, will be photographed.
If all switches 13 to 21 are pressed, all nine frames mentioned above will be photographed. Switches 13-21 are button 13
'~21' (A switch that closes only when the second button is pressed, and the result of that operation is (1) when the button is pressed.
Exposure control value conversion setting circuit 1 with the case of not pressing being set as (0)
The stored results are output to terminals 50 to 5 (the correspondence between switches 13 to 21 and terminals 50 to 5 corresponds to the positional relationship shown in the figure, and 13, 58, 14 and 5
7. ...21 and 50 correspond). With the above configuration, the result of shooting mode selection setting is terminals 50 to 63.
(to) or (1) is output. 5 is a multiplexer which scans the output states of terminals 50 to 63 according to the control signal from the control circuit 45,
to be memorized. Control circuit 45 and multiplexer 5 are connected to terminal 70. '71, and the control circuit terminal '70. The output status to '71 is (00)
(The numbers in parentheses represent the binary code)
Multiplexer 5 has 4 bit terminals from the left, namely 50 to 5.
The signal state of No. 3 is read and sent to the terminals 66 to 69 and input to the storage circuit 41. Next, the terminal '70.71 is (Ol)
When , the multiplexer sends the 4-bit signal state of terminals 54 to 57 to the storage circuit 41, and the following terminals 70 and 71
When 70.71 is (10), the signal states of terminals 58-61 are sent to the storage circuit 4-1, and finally, when 70.71 is (11), the signal states of terminals 62-65 are sent to the storage circuit 4-1 for storage.

Figure 2 is a rear view of a camera to which the present invention is applied, where C is the camera body, W is a winder, 31 is a finder, and 32 is a rear view of a camera to which the present invention is applied.
is the shutter release button. 13' to 21' are preset buttons that correspond to switches 13 to 21 and operate these switches, and L1 to L9 correspond to switches 13 to 21.
The lamps corresponding to the switches 21 to 21 that correspond to the one pressed are turned on to display the setting results. Dial 2 is used to select and set the number of frames to be shot, from 1 to 5 frames, continuous frame shooting, and A mode, and aligns the numbers or letters on the dial with index 3Q. The number is the number of pieces, C
indicates continuous frame shooting, and A indicates A mode. 29 is three types of modes P within A mode.

It is used to select and set F and T. When 29 is aligned with the scale letter P, it is P mode, and when it is aligned with F, it is F mode.

When set to T, T mode is set. These setting results are output as binary codes to terminals 5° to 63 in the circuit shown in FIG. 1, as described above. As described above, a 16-bit binary code is stored in the memory circuit, and the control circuit 45 operates the arithmetic circuit 42 based on this binary code in accordance with the given program to determine the output of the photometric circuit 40. The calculation is performed to form an exposure control signal for each point shown in FIG. 3, which is output to the exposure control circuit 44, which causes photographing to be carried out using the exposure setting selected from each point shown in FIG.

The exposure control value conversion setting circuit 1 is provided with a clear switch 12 for erasing the setting results of the memory circuit 41. This switch is a switch that is closed by the clear button in FIG. The memory of circuit 41 is cleared. Further, in circuit 1, terminal 23 is connected to block 2, but this terminal is connected to block 2 in a shooting mode other than A mode (simply 1
When the exposure value conversion is not performed in the frame shooting mode, multi-frame shooting mode, or continuous frame shooting mode, the level is low, and at this time, the circuit 1 does not read the setting results of the switches 13 to 21. If the result of converting the exposure factor in the arithmetic circuit 42 according to the settings of the exposure control value conversion setting circuit 1 is outside the camera interlocking range, the arithmetic circuit 42 outputs a signal to display a warning on the display device 43. At the same time, this signal is also sent to the terminal 24 of the exposure control value conversion setting circuit 1 through the terminal 72, and the memory corresponding to the setting that is no longer linked is reset, and the display corresponding to that setting (L1 in Fig. 2) is sent to the terminal 24 of the exposure control value conversion setting circuit 1. ~L9) is also turned off.

Next, the operation will be explained based on FIGS. 1 to 3. When the mode setting dial 2 on the winder side is set to the A mode and the mode setting lever 29 is set to the P mode, the block 2 outputs a signal (111) and the block 3 outputs a signal (Ol). At this time, switch 11 on the winder side
is closed, a 10-" signal is output to the camera via the inverting circuit 〒 and the terminal 75.Next, the preset buttons shown in FIG.
・When 17', 19/ is pressed, Ll, L3°L5.
L'i' lights up and terminals 50-5B (Oolo 1
0101). Next, when the camera side starts operating, the control circuit 45 first connects the terminal 75 to 10-"
It receives the signal and performs control for winder photography. First, from the control circuit 45 to the terminal '70.
The signal (11) is output to 71, and the signal (01) of input terminals 62 to 65 is output to output terminals 66 to 69 of multiplexer 5.
11) is output and this signal is stored in the memory circuit 41, and then the signal to 70.'71 becomes (10) and is sent to terminal 6.
The signals (1111) from input terminals 58-61 are output to terminals 6-69 and stored, and then the signals to terminal '70.71 become (01), and the signals from input terminals 54-5 to terminals 66-69 are
7 signal (1010) is output and stored in the memory circuit 41, and then the terminals 70 and 71 become (00) and the terminals 66 to 6
The signals (0010) from the input terminals 50 to 53 are outputted to the input terminal 9 and stored in the storage circuit 41. Therefore, the 16-bit signal (001010101]-110111) is stored in the memory circuit 41.

Here, from the output of the photometric circuit 40, for example, the point A V of P5
= 7, T V = 7 is output at °C, the signal from the memory circuit 41 determines AV+2 = 9. TV-2
The calculation of Mi5 is performed, and the signal corresponding to this point Pl sets the aperture aperture value to 22 (F number) and the exposure time to 1/3.
0 seconds is displayed in the finder 31. At the same time, the exposure control circuit 44 performs exposure control, and when the exposure operation is completed, the exposure control circuit 44 outputs a 1 high" signal, and this signal is transmitted to the wine goo side via the terminal 73, and is transmitted to the exposure control value conversion setting circuit. The signal is inputted to the terminal 25 of Ll to set the terminal 58 to 10-'' and turn off the light of Ll.

At the same time, the wine goo circuit 4 operates to wind the °C film and charge the shutter. When this is completed, the wine goo circuit 4 outputs a 1 high signal, which is input to the °C control circuit 45 via the terminal 74. Start the next shooting operation.

Next, the arithmetic circuit 42 determines which calculated values AV-9 and T'V should be calculated first.
=5 AV-0,5=8.5. TV+0.5=5゜5
The 8th bit from the top of the memory circuit 41 is '
0'', so the signal compatible with this AV and TV is the display circuit 4.
3. There is no input to the exposure control circuit 44, and the arithmetic circuit 42 is
The terminal 57 is reset by inputting a ``high'' signal to the terminal 24 of the exposure control value conversion setting circuit 1 through the terminal 72, but since the terminal 57 was ``low'', it remains 10-'' and L2 is also turned off. The control circuit 45 then immediately shifts to the next photographing operation.

Next, in front of the arithmetic circuit 42ii (DSv=8.5+TV=5
AV-Q again to the value of °5, 5=8. TV+0.5. =6
The value corresponding to the point P3 is calculated by calculating the value corresponding to the point P3, and since the 7th bit from the top of the memory circuit 41 is (1), the value corresponding to the point P3 is calculated.
The display circuit 43 displays an aperture aperture value of 8 (F number) and an exposure time of 1/60 seconds in the finder 31, and based on this exposure control value, the exposure control circuit 44
Exposure control is performed by When the exposure control is completed, a 1 high" signal is sent to the wine goo circuit 4 through the terminal 73.
Input to exposure control value conversion setting circuit 1 and terminal 56 is 10-
", and L3 turns off. At the same time, film winding and shutter charging are performed by the wine goo circuit 4, and upon completion, a signal of "1 high" is input to the control circuit 45 to begin the next photographing operation. Similarly, P5
．． Exposure is performed using the exposure control value corresponding to point P7.

When the mode setting lever 29 is set to F, block 3 is set to F.
mode (10), and the arithmetic circuit 43 first outputs AV+2. Perform TV-1-0 to specify the exposure control value of point Fl, and then sequentially apply AV-0 to that exposure control value.
5. The calculation of TV 10 is repeated to sequentially designate the exposure control values for points F2 to F9. Then, the exposure control circuit 44 operates at the point designated by the preset buttons 13' to 21', and photographing is performed.

When the mode setting lever 29 is set to T, the block 3 is set to T.
mode (01), and the arithmetic circuit 42 first outputs T
If the exposure control value corresponding to point T1 is specified by performing V-1-2 and AV-1-0 and the preset button 13' is specified, shooting will be performed based on this exposure control value, and the specified exposure control value will be used. If not, the camera immediately starts the next shooting operation. Hereinafter, the calculation circuit 42 sequentially calculates the TV value for the exposure control value.
-0,5° AV 100 calculations, sequentially specify the exposure control values for points T2 to T9, and press the preset buttons 14' to 21.
Photography will be performed only at the locations specified by '.

Also, as mentioned above, for example, if the aperture value of the lens is 22
If the calculation result is F value 32, that is, if the calculation result exceeds the exposure control range, the calculation circuit 42 outputs a warning signal, the display circuit 43 displays this in the viewfinder 31, and the terminal 72, a signal of "1 high" is sent to the terminal 24 of the C exposure control value conversion setting circuit 1 manually, the stored value corresponding to the designated preset button is reset, and the display is also turned off. After a certain period of time, the control circuit 45 outputs a signal to proceed to the next photographing operation.

Next, when the mode setting dial 28 is set to C, the signal (110) is output from the block 2, and at the same time, the 10-'' signal from the block 2 is manually input to the terminal 23 of the exposure control value conversion setting circuit 1. Signals from switches 13 to 21 are not accepted.The signal to this terminal 23 is always "low" in modes other than A mode, as shown in the diagram.

In the C mode, it is a continuous shooting mode, and the signal from the photometry circuit 40 is directly outputted from the arithmetic circuit 42 and input to the display circuit 43 and exposure control circuit 44 to perform exposure control. When the exposure operation is completed, the winder circuit 4 operates to wind the C film and charge the shutter. If, for example, the release button 32 of the camera is pressed down when the shutter charge is completed, the winder circuit 4 operates again based on the output of the photometry circuit 40. Then, the exposure control operation is repeated.

When the mode setting dial 28 is set to a number from 1 to 5, the block 2 outputs any value from (001) to (101). This value is stored in the storage circuit 41,
Exposure control operation is performed by the signal from the photometry circuit 40, and when this is completed, the winder circuit 4 winds the film and charges the shutter, subtracts (1) from the signal from the block 2 stored in the memory circuit 41, and
If this value is not (000) and the release button is pressed down, exposure control is performed again based on the output from the photometry circuit 40, and when the operation is completed, the winder circuit 4 winds the film again and charges the shutter. Block 2 is created and stored again in the storage circuit 41
The operation of subtracting (1) from the signal from and determining whether it becomes (000) is repeated. That is, if the release button 32 is kept pressed, continuous shooting will be performed for the number of images set by the mode setting dial 2.

When the winder mode setting lever 29 is set to OFF or when this winder device is not attached to the camera body, the input signal to the terminal 75 becomes 1", and the signal from the control circuit 45 is normally The exposure control circuit 4 outputs a photographing control signal based on the signal from the photometry circuit 40.
4 operates and when the control operation is completed, the operation ends.

FIG. 4 shows a specific circuit example of the exposure control value conversion setting circuit 1 shown in FIG. Circuit components that are the same as those in FIG. 1 are designated by the same reference numerals. The switch 22 is a switch provided in the block 2 in FIG. 1, and is closed when the mode setting dial 28 in FIG. 2 is set to the A mode, and is opened in other modes. The signal from switch 22 is input to one input terminal of the circuits ANDI to AND9, and the signals from switches 13 to 21 are input to the other input terminals of ANDI to AND9.

The output terminals of ANDI-AND9 are connected to set terminals 81-S9 of R-8 flip-flops FF1-F'F9. The inverted output terminals Q1 to Q9 of the R-8 flip-flops F71 to FF9 are p-channel MO8FEiT S
TI~5T9 (7) connected to gate, Q1~Q9 is 6
0-”, the light emitting diode Ll~ is activated by MOSFET STI~ST9 and transistor BTI~BT9.
It is connected so that L9 lights up. Non-inverting output terminal Q of R-8 flip-flop FF 1, FF 9
1 to Q9 are the input terminals 58 of the multiplexer 5 in FIG.
~50. Incidentally, the R-S flip-flops FFI to FF9 are constructed of two NOR circuits as shown in FIG.

Switch 1 that is closed when the winder is powered on
The signal 1 is input to one input terminal of the ORI via the shot pulse generation circuit 081. clear button 12
The signal from switch 12 linked to ' is input to the other input terminal of ORI. The output terminal of OR1 is OR3~0RII
is connected to one input terminal of OR3-0R11, and the other input terminal of OR3-0R11 is connected to one input terminal of Funshot pulse generation circuit O83-08.
11 to the output terminals 81 to 89 of the C10 bit shift register SR. The output terminal 80 of the shift register SH is not connected to anything. The output terminal 8B of the shift register SR is connected to the serial input terminal Sli of the shift register SR. shift register EIH
Of the parallel input terminals, 81f to 891 are connected to ground, 80
/ is connected to +tmv, pD. The P terminal of the shift register is connected to the output terminal of ORI, and when this P terminal rises to "high", the shift register SR takes in the parallel inputs 80' to 89' and directly outputs them to the output terminals 8o to 89. \Output. When the shutter closing operation is completed, the terminal 73 which becomes 1 high is connected to the input terminal 25 of OR,2 and is also connected to the input terminal of the wine goo circuit 4.
There is C. The other input terminal 24 of OR2 is a terminal 72 that becomes 1" when the camera side does not perform an exposure control operation.
The output terminal of OR2 is connected to the clock input terminal CK of the shift register SR via the one-shot pulse generation circuit O82. This GK terminal is “high”
When the voltage rises, the signals at the output terminals 80 to 89 are shifted to the left one bit at a time, and since the terminal 88 is connected to the S terminal, the signal at the terminal 88 is output to the terminal 80.

The operation will be explained below. When the power of the wine goo is turned on, the C switch 11 is closed, the one-shot pulse generation circuit 081 outputs a C positive pulse, and the output terminal of ORI outputs a positive pulse, which is passed through OR3 to ORI1. TeR
-S flip-flops are all C inverted output terminals Q1~Q
9 is ``I・I'', non-inverting output terminals Q1 to Q9 are 10-
”. At the same time, shift register SR
A positive pulse is manually applied to the P terminal, a signal (oooooo○001) to the parallel input terminal is taken in, and this signal is output to the output terminals 80-89. Therefore, 80 is (1
), 81 to 89 are (0). Next, when the mode setting dial 2nd is set to A, the switch 22 is closed and
The gates of NDI to AND9 are opened. Next, for example, if the preset buttons 14', 17', 20I are pressed, the switches 14, 17, 20 are closed and the AND2. AND5. A
The output of ND8 becomes 1 high", the inverted output terminals Q2.Q5.QB of the R-S flip-flop become 10-", and the non-inverted output terminals Q2. Q5. QB is set to 6 high", terminal 5", 54.51 becomes 6 high", 5B, 56.55
, 53, 52.50 remain at 10-''.At the same time, L2, L5, and L8 light up.Also, clear button 12
When ' is pressed, switch 12 is closed and a positive pulse is output from OR'l, causing 'C.

A positive pulse is output from the output terminal of 0R11 to R3, and all the inverted output terminals Q1 to Q9 of the R-S flip-flops FFI to FF"9 become 5", and the non-inverted output terminals Q1 to Q9 become 10-'', and all of L1 to L9 are turned off.

Next, the photographing operation starts, and if the initial exposure control value is within the control range and the flip-flop FFI is set, the exposure control operation is performed and when the terminal 73 goes high, a pulse is generated from the one-shot pulse generation circuit O82. outputs, the signal at terminal 80 moves to terminal 81, becomes 1 high, and a positive pulse is output from one-shot pulse generation circuit OE+3, flip-flop FF:L is reset, and Q1=O.
, Ql=1, and Ll goes out. At the same time, the wine goo circuit 4 operates to wind the film and charge the shutter, and when the operation is completed, the terminal 74 becomes "...".
becomes. Also, if the exposure control value is outside the control range or the flip-flop FFI is not set, the terminal 72
1...I" signal is input manually, and similarly, a positive pulse is output from the fun shot pulse generation circuit O82, and the output is 80.
17-I'' signal is transferred to the terminal 81, and a positive pulse is output from OR3, but the flip-flop remains reset and maintains the state Q1=0.Q, l=1.Similarly, the shift register 1 high” output shifts to the left, resetting the flip-flop.

Then, when the '6 high' signal of the C terminal 88 is transferred to the terminal 89, since the terminal 8 is connected to the series input terminal S, the 'high' signal is also transferred to the terminal 80 when the power is turned on or the signal is cleared. The initial state is the same as when the button 12/ is closed, and the exposure control conversion value can be set by pressing the preset buttons 13' to 21' again.

If you want to stop the shooting operation in the middle of shooting, press the clear button and a positive pulse will come out from ORI and OR3,0RI will be released.
All flip-flops are reset via I and L
1. L9 also goes out, and at the same time, the P terminal of shift register SR also becomes "high" and the parallel input terminals 80' to 89
' signals are outputted to the output terminals 80 to 89 and reset to the initial state.

FIG. 6 is an example of a circuit in which the circuit on the camera side of FIG. 1 is implemented using a microcomputer (hereinafter referred to as microcomputer). 200 is carry flag cY1 zero flag ZF, 8
Bit accumulator ACC, 8-bit register≠OR~≠9R.

A central processing unit (hereinafter referred to as CPU) consisting of bare registers +OPR, +8PR, etc., which function as 16-bit registers with two registers, and also includes a logic operation unit, timing controller, stack, stack pointer, program counter, There are an instruction register, an instruction decoder, etc., but they are omitted because they are not directly related to the operation of this invention. 300 is a read-only memory (ROM read-only memory) in which instructions and data are stored, and 400 is a read-write memory (RAM runtime access memory) in which data is temporarily stored. .OPI, OP2.
OP3 is an output port, IPl and P2 are input ports. In the photometry circuit 40, 33 is a camera lens;
4 is an aperture, PD is a light receiving element, and BS is a variable constant voltage source that sets the film sensitivity and adjusts the output level of the photometric circuit.

D is a logarithmic compression diode, and OP is an operational amplifier.

100 is a DA converter, and AC is an analog comparator. 101 is a circuit for outputting a signal of the open aperture value AVO of the interchangeable lens, and terminals 66' to 69' are connected to output terminals 66 to 69 of the multiplexer shown in FIG. Terminals ry o', 7'l l are connected to control signal input terminals 70, 71 of the multiplexer of FIG. 1, and 72' is connected to terminal 72 of FIG. 102 is a magnet circuit for release, 103 is a magnet throat circuit for aperture control, and 104 is a magnet circuit for controlling a reflective mirror.
106 is a magneto-gutter circuit for controlling one shutter, and 106 is a magneto-gutter circuit for controlling two shutters. Note that the magnet nodes in the circuit 102 to 106 are magnets having a permanent magnet as a core. 0107 is a switch that is closed in the first step when the release button '32 in FIG. 109 is the diaphragm 34 of the interchangeable lens.
a switch, 110, that is closed when the minimum aperture is reached;
11 is a switch that is closed when the mirror has finished rising;
1 is a switch that is closed when the two engines complete running. 112 is a circuit that outputs a signal of the minimum aperture value of the interchangeable lens; -f! For example, when the minimum aperture value is F22, (0
) When the F value is 32, (1) is output.

The terminal 75' inputs a signal indicating that the shutter is attached and the power supply is turned off, and the terminal 74' inputs a signal indicating that winding of the shutter circuit is completed. The terminal 73' is a terminal that transmits a signal from the switch 111, which is closed when the two units have completed running, to the shutter device. 42 is a circuit that displays the exposure control value and that it is outside the control range.

No. 7-1. 7-2. FIG. 7-3 is a flowchart showing the operation of the circuit of FIG. 6. The operation shown in FIG. 6 will be explained below with reference to FIG. Note that the exposure control here uses program exposure in which both the exposure time and the aperture aperture value are automatically determined according to the brightness of the subject.
This program can be in any format.

First, in the first step when the release button 32 is pressed down, the switch 107 is closed and a 1 high signal is input to the reset terminal RI8 of the CPU 200, the CPU 200 is reset and the program starts. is (1), and if (1) is normal shooting, +3), skips the command (4) and moves to the command (5).When the terminal m is (0), the multiplexer 5
Store the 16-bit signal from ≠OPR. A specific method for this is, for example, to set (Go)H (here, H is a hexadecimal number) to ACC, output this data to OP2, and then output the data to OP2. Import into ACC and mask these upper 4 bits c
Set to +IR, then go to A C'C (80) Set H, output this to OP2, and set the data to 'C'C P2 to AC.
C, mask the upper 4 bits, shift 4 bits to the left, perform ACC) + (≠IR), and set this value to 41H.
Set to Similarly, if the remaining 8 bits are set to ≠OR, the signals from terminals 65 to 50 in FIG. 1 are stored in ≠OPR. Therefore, when this data fetching operation is completed, the values of ≠OR and S1 are as shown in the table below. In the following, 6.5.4 bits of +I will be referred to as M'1, and 3.2 bits will be referred to as M2.

Next, the process moves to command (5), and the apex value A■0 of the open aperture value of the lens is set to $2 according to the signal from block 101.
Set to R. For this method,

Mask all bits other than the terminal from lock 101, shift 4 bits to the left, add a constant to this data, specify an address in ROM 300 with this data, and set the apex value AVO of the open aperture value stored at that address. Set the corresponding data to +2R. Then block 112
When the signal strength is (1), the data corresponding to the minimum aperture value AVm-10 is set to +3R, and when it is (0), the data corresponding to AVm=9 is set to +3R.

(7) Output BV+'3V-A from the photometric circuit with the command
Converts an analog signal corresponding to 0 into a digital signal. This method is as follows. First, $5
Set (FT)H to R, then subtract 1 from this i) and get O
The output of the comparator AC is outputted to the PI and outputted via the D-A converter 100 to compare the levels of the photometric circuit and the D-A converter. When (by subtracting 1 from the contents of +5R and outputting this data, it is determined whether the output of comparator AC is the inverted force) and if C1 is ``no-i'' then it is 45 again.
Repeat the action of subtracting 1 from the contents of H, and get Con1.
When the output of the converter AC is inverted, the content of +5R becomes a digital signal corresponding to BV+5V-AVO.
There is. Alternatively, output (80)H from OPI and D-A
An analog signal corresponding to this signal is output via the converter IQO, and the output of the converter AC is 1 no.
−”, and if it is 1 no・i”, it is +5H (○O)
When H is 10-'', set it to +5R (80)'H, then output a signal that adds (40)H to the contents of 4=5R, and the output of comparator AC becomes 1 no. ” when 4
Add (Oo)H to the contents of 1+5H, and when it is 10-'' add (40)I(.Hereafter, (20)H, ('l O
) H.

The same operations as (08)H', (04)H, (02)H, and (01)H are repeated, and finally the content of 4=5R is the conversion of the output of the photometric circuit into a digital signal.

Next, add the contents of +2R to the contents of +5R [If you set this value to +5R, the contents of +5R will be BV + SV; EV
The signal corresponds to Next, it is determined whether the signal corresponding to this KV is within the exposure control range, and if it is outside the range, the display circuit 42 displays over or under and the microcomputer stops operating.

If the signal corresponding to EV is within the exposure control range, then specify the address of ROM 300 with the signal obtained by adding a constant to this signal, and add the signal corresponding to the apex value of the exposure time stored in that address to +7R. and from the contents of +5R +
The value obtained by subtracting the contents of 7R, that is, the signal corresponding to KV-TV=AV is set to +6R. That is, this is a so-called program exposure in which the exposure time and aperture aperture value are automatically determined according to the E'V value.

Next, the apex value AV of the aperture value set in Na6R
It is determined whether the aperture is between the minimum aperture and the maximum aperture of the lens, and if it is outside the range, the microcomputer stops operation after displaying under or over. Alternatively, it is determined whether the mode setting dial 28 is set to A mode, and if it is other than A mode, under or over is displayed and the operation is stopped, and when in A mode, under or over is displayed. You can then go to the command r(18). If it is within the control range, the aperture aperture value and exposure time are displayed. Examples of this display method include 46R and +7H.
Specify an address in the ROM 300 with the data corresponding to the integer part of the apex value stored in , store the data necessary for segment display of the aperture aperture value or exposure time at that address, and output this data. There is a method of displaying the aperture aperture value and exposure time, and truncating the decimal part of the apex value, displaying it in segments, or displaying it in dots at an arbitrary resolution.

Next, the program moves to command (18), and it is determined whether the release button is pushed to the second step and the C switch 108 is closed. If the switch 108 is not closed yet, (A- Return to the D conversion command and repeat the above operation again.

When the switch 108 is closed, a transition is made to the exposure control operation. First, it is determined whether the image is to be photographed using a winder device, and if the image is to be photographed normally, the command (64) is received and the exposure control operation is started. When shooting with a winder device, set (80)H to +8H and (00)H to 49R to determine where the mode setting dial 28 is set, and when in mode other than A, set ( 131) Stop and perform normal continuous shooting. When in A mode, add 1 to the contents of $9H, move the contents of 48H to ACC, and take the logical sum of NIR and ACC. Here, preset button 13
’ is closed, the most significant bit of ≠IR is 1
Then, ACC≠IR≠0 becomes ZF≠1,
The exposure control value conversion operation begins. When the preset button 13' is not closed, set the terminal to 1 high (80
) to the command.

The command (32) determines whether the mode setting lever 29 is set to P mode, and if it is not set to P mode (01), the command (33) determines whether it is F mode or T mode. , in F mode, go to (51), and in T mode, go to (56). In P mode (01), (14)H is added to the apex value of the aperture aperture stored in +6H, and (14)H is subtracted from the apex value of the exposure time stored in 4'7H. Here, the apex value is the value multiplied by 10, so (14) H is 1
It is 20 in decimal notation, which corresponds to 2 EV. Also TV
Since it may be negative (when the exposure time is 1 second or more), the constant α is selected so that the content of 10@TV+α is always negative. This operation determines the exposure control value of Pl in FIG.

Next 1. It is determined whether the content of %6R is larger than the apex value of the minimum aperture value, and if it is larger, an over display is performed, and then the terminal is set to 1 high" and after a certain period of time has elapsed, the process jumps to the command (87). The reason for waiting for a certain period of time is that if the over-exposure control value is displayed and you immediately start shooting with the next exposure control value, the photographer will not know at what exposure the shooting is being performed.If it is small, the command (43) Determine whether the content of 7 is smaller than the apex value of the longest exposure time, +7H ((44) to (for TVmin)
47) performs under display.

When the Pl point is within the exposure control range, (4B), (49)
Display the exposure control value with °' (go to command (64).

When the mode setting lever 29 is set to F mode (10), the command (51) changes the contents of 46H to (14)H.
, and specify the exposure control values for the points F and l. If the content of 46H is thicker than the content of the three points, (39) the following command is used to overdisplay. The content of 46H is +3H
If the content is below, the aperture aperture value is displayed and the process goes to command (64).

When the mode setting lever 29 is set to T mode (11), the command (56) changes the contents of +7R to (14)H.
and specify the exposure control value for the point T1, and when it is outside the exposure control range, over-display is performed with the commands from (5th) to (61). (87) If it is within the exposure control range, the exposure After displaying the time, the process moves to the instruction (64).

The command from (64) is an exposure control operation. First, C 6
"high" and operates the release magnet circuit 102 to perform a release.

Next, the value obtained by subtracting the content of 46H from the content of +5H is AC
When the value is set to C and this value is output to OPI, the DA converter 100 outputs an analog signal corresponding to EV-AV. At the time when the aperture starts to stop down, the photometric circuit is outputting an analog signal corresponding to FiV-AVO, and (EV-A VO) ) (B V-A
V), so the output of the comparator AC is 10-". When the aperture is stopped down, the output level of the photometric circuit gradually decreases, and when the aperture 34 is narrowed down to the planned aperture, the output a of the comparator AC is reversed. When this signal is input, the terminal d is set to 6 high, and the aperture control magnet circuit 103 is operated to stop the aperture operation and determine the aperture aperture. Note that if the output of the comparator does not invert even when the outside light becomes bright and the aperture reaches its minimum value, it becomes impossible to remove the aperture from the flow of the aperture control. In order to prevent this, the switch 109 is closed when the minimum aperture is reached, and when the terminal j becomes 1 high, d is set to 1 high and the process moves to the next command.

Note that the switch 10 closes when the narrowing operation stops.
Even if 9 is omitted and the following operation is performed, it is possible to omit the aperture control flow. Before the instruction (66), set a constant in the register in RAM 400,
Outputs the contents of ACC to o and pl, determines whether the output of comparator AC is inverted, and if not, outputs R.
Add 1 to the register in AM400, determine whether this register has overflowed, and if it has not overflowed, go back to the instruction to determine the output of comparator AC, and if it has overflowed, go to instruction (69). If set to , the aperture control flow will be removed after a certain period of time after the narrowing operation starts, and this fixed time should be made longer than the time from when the narrowing operation starts until the minimum aperture is reached from C. Bye. Also,
Connect the counter externally, open the clock input gate of this counter with the instruction (64) (set C = 1), input the reference clock to the counter, and connect the most significant bit output of the counter to terminal j. If you do that, (
With the same command as 64) to (69), it is possible to exit the aperture control flow after a certain period of time.

Next, with the command (70), the terminal e becomes 1", the mirror control magnet circuit 104 operates, and the reflecting mirror starts to rise. When the rising is completed, the switch 110 closes and the terminal k becomes 1 no i". Then, the terminal f is set to 1 high, the negative curtain control magnet circuit 105 is operated, the first curtain starts running, and the counting of the exposure time starts.

As a method of counting the exposure time, for example, divide it into groups for each jf2' magnification and store only the data corresponding to the group with the shortest exposure time in the ROM 3001.
It is determined whether the data stored in the ROM 30 belongs to the group F, the number of the data stored in the group is determined, and the corresponding data is stored in the ROM 30.
Specify the address 0 and store the address 2-(TV-
Take out the data corresponding to There is a way to get it.

When the exposure time count is finished, terminal g&″´ノ・i”
As a result, the magnet circuit 106 for controlling the two engines is operated to start running the two engines. Next, wait until the two units have finished running, the switch 111 is closed, and the terminal l becomes "high." When the terminal l becomes "1", the next time the winder device is used to increase the shooting power. ) and ゛, and terminal m is ノ1.
When it is set to "A", it is normal shooting and the microcomputer stops operating.For other shooting, the signal from switch 111 starts film winding and shutter charging, and when this is completed, terminals Then, it is determined whether or not the release button 32 is kept pressed. If the release button 32 is released, the terminal becomes "low" and the microcomputer stops operating. If so, the process jumps to command (87) and starts the next photographing operation.

The commands (80) to (86) come from the command (31) and are the commands when the preset button 13' is not set. The position of the mode setting lever 29 is determined by the commands (80) + (83), and when in P mode, (14)H is added to the contents of +6R, (14)H is subtracted from the contents of +7R, and (87) Jump to the command, and when in F mode, add ('14)H to the contents of +6R (87)
jumps to the command, and when in T mode, changes the contents of +'7H (1
4) Add H and jump to command (87).

Commands from (87) are sent from preset buttons 14' to 21.
This is a command to take a picture with the exposure control value set in '. (87) determines whether the mode setting dial 28 is set to A mode, and if it is other than A mode, (
Jump to the command of 131).

When in A mode, the next step is to determine whether the content of 9R is (09)H. If it is (09)H, it means that the shooting up to preset button 22' has been completed, and the microcomputer stops operating. Stop. (09) If not H, then add 1 to the contents of +-9H and move on to the 0th order instruction. Next (9
Commands 0) to (94) are commands for determining whether the exposure value at which the next photographing will be performed has been selected by the preset button. First, move the contents of +8H to ACC, and
Rotate counterclockwise, move the contents of ACC to 48H, and
The contents of CC and the contents of ÷OR are logically ORed, and this value is (
When it is 00)H, that preset button is not selected, and when it is not (00)H, it means that that preset button is selected.For example, whether preset button 17' is set or not. To explain the case of determining 48H at the time of instruction (90),
The content is (oooooloo). If you rotate this one bit to the left, it becomes (00001000), and ≠
The data stored in OR is preset button 17.
' is set (φφφφ1φφφ), (φ can be 0 or 1), and if not set (φφφ
φOφφφ), and when the logical sum is taken, when it is set, it is (00001000), and when it is not set, it is (oooooooo), which can be determined by the instruction (94).

If ZF becomes 1 with the command (94), it means that the preset button is not set, so after setting the terminal to "high", determine the position of the mode setting lever 29 with the commands (96) and (99). , in P mode, from the contents of 46H (0
5) Subtract H and add (05) H to the contents of +7 (87
), and in F mode, subtract (05)H from the contents of +6, and in T mode, subtract (05)H from the contents of +7H, and return to instruction (87). here,
This command is used to specify P2 to P9, 72 to F9, and T2 to T9 in order even if the preset button is not selected, and to perform a photographing operation when the preset button is selected.

Next, when the preset button is set, (1
Determine whether it is P mode with the command 03). When in P mode, subtract (05)) I from the contents of +6H, add (05)H to the contents of 4=7R, and determine whether it is within the exposure control range. However, if it is outside the control range, a display is made and the process returns to the command (87), and if it is within the range, the process moves to the exposure control operation from (64). When not in P mode, use command (11B) to
If it is F mode, subtract (05)H from the contents of 6R, and then perform the same operation as P mode. If it is not F mode, it becomes T mode, and 1i7H.
By subtracting (05)H from the contents, the following operation is the same as in P mode.

The command from (131) is the shooting mode when the mode setting dial is set to a mode other than A mode, and the exposure control operation from command (25) to (64) is performed, and the command from (87) is the shooting mode when the mode is not A mode. Once this is known, it is determined whether the mode is C mode using the command (131), and if the mode is C mode (110), the process returns to A-D conversion (7) and exposure control is performed again. This operation is performed by pressing the release button 32 with the command (7B).
This is repeated until it is determined that it has been released.

When the mode setting dial 28 is set to a mode other than A or C, for example, if it is set to
00φφ11). In this case, use (134) to calculate (000'1OOOO). Subtract this value from IR (φ0
11φφ11) to ACC and to 4BR (0111
0000), take the logical sum of +8H and ACC,
If this value is not (○O)H, return to the A-D conversion command in (7), take another image, and repeat the operation to return to the command (133), so that the logical sum is (00)H, that is, +I
Repeat until the content of H becomes (φ0゛00φφ11). Therefore, the number of images to be photographed is the number specified by the mode setting dial 2, and the photographing operation is completed.

As described above, according to the present invention, it is possible to select and set an arbitrary number of different exposure amounts or combinations of different exposure values for the same subject based on the drawing intention, and it is possible to easily take pictures at the set values by continuous shooting. It has the effect of still,
In this embodiment, an accessory device is attached to the camera body, but it is also possible to implement the camera body alone without much difference from this embodiment. In addition, an example using an 8-bit microcontroller is described.
Even if a bit microcomputer is used, it can be implemented without essentially changing from the previous example, and in Figure 7, if the number of registers in the CPU is small, it can be implemented with almost the same operation by using registers in the RAM. It is possible. Also, the seventh
In the example shown in the figure, power for all C circuits needs to be supplied by a separate power supply switch, but if most of the circuit components are composed of C'-MO8 elements, the power supply switch can be turned off. Since the power consumption is almost negligible except during shooting operations, it is suitable for cameras that use batteries as a power source. Further, in the case where power supply is started when the switch 107 is closed, the power supply holding circuit needs to operate until the photographing is completed when the switch 10B is closed.

Furthermore, this device can be applied not only to programmed exposure cameras, but also to aperture-priority automatic exposure, exposure time-priority automatic exposure, and manually set exposure cameras.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the invention. FIG. 2 is an external view showing an example of a configuration in which a part of the device of the present invention is incorporated. Figure 3 shows the standard or proper exposure when the aperture aperture is F-number 11. It is a graph showing combinations of exposure values that can be selected in each shooting mode when the exposure time is 17125 seconds. FIG. 4 is a specific example of the circuit of block 1 in FIG. 1, which is an embodiment of the camera body using a chip. Figure 7 is R of Figure 6.
3 shows a flowchart of instructions stored in OM 300. DESCRIPTION OF SYMBOLS 1... Exposure control value conversion setting circuit, 2, 3... Shooting mode setting circuit, 4... Winder circuit, 5... Multiplexer, 13-21... Preset switch, 4
0...Photometry circuit, 41...Memory circuit, 42...Arithmetic circuit, 43...Display circuit, 44...Exposure control circuit, 45...Control circuit. Agent Patent Attorney Kosuke

Claims (1)

[Claims] Calculation means that has at least one automatic exposure control mode such as a program, aperture value priority, or exposure time priority, and calculates a combination of exposure control data indicating an aperture value and exposure time that yields an appropriate exposure according to a photometric value of subject brightness. an exposure control device for a camera, comprising: data output means for outputting a plurality of changed data having different values; and one of the exposure control data of the calculated combination based on the changed data of the data output means. a changing means for calculating a combination of an aperture value and an exposure time that are changed by an amount equivalent to an APEX value and the other is changed by the same amount in the opposite direction; and a plurality of combinations based on all the changed data from the data output means. an exposure control device for a camera, comprising: a control means for performing an exposure control operation by changing the calculation combination of the changing means every time an exposure control operation is completed so that the exposure control operations are performed sequentially. .