JPH087359B2 - Camera exposure controller - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an exposure control device for a camera including an auto bracket shooting control means for performing continuous shooting while automatically changing an exposure value. is there.

Note that the auto bracket (to be exact, an auto exposure bracket) means the exposure value of the camera (in the case of automatic exposure, the exposure control value automatically calculated from the subject brightness and film sensitivity, and in the case of manual exposure) ,
The camera is offset with respect to the shutter speed and aperture value set by the photographer. Simply put, it means that when shooting a certain subject, the camera automatically takes a plurality of pictures by changing the exposure value in several steps.

(Background of the Invention) In a camera in which the valve mode and the auto bracket mode can be set independently, it is possible to shoot in both modes. However, in bulb photography, the difference in exposure level is due to the photographer pressing the release button.
Auto bracket shooting in valve mode is essentially meaningless because it depends on the time when it is canceled. Therefore, if it is possible to unnecessarily perform shooting by setting both modes, there is a risk that the photographer misunderstands and makes an erroneous operation.

(Object of the Invention) An object of the present invention is to solve the above-mentioned problems and to provide an exposure control device for a camera capable of eliminating meaningless setting of the auto bracket mode.

(Features of the Invention) In order to achieve the above object, the present invention sets an auto bracket mode and a valve mode in response to an operation of a mode setting operation means for manually setting an auto bracket mode and a valve mode. A mode setting circuit for controlling the exposure, and an auto bracket shooting control means for automatically changing the exposure value for each shooting frame when the auto bracket mode is set by the mode setting circuit to shoot each shooting frame; When the valve mode is set by the mode setting circuit, the valve shooting control means for shooting the valve, which is in the exposure state while the release operation member is being operated, and the valve mode is set by the mode setting circuit. In this case, the mode setting circuit is operated by the operation for setting the auto bracket mode by the mode setting operation means. Prohibiting means for prohibiting the mode from being changed to the auto bracket mode, and the mode setting operation means for operating the valve mode setting when the auto bracket mode is set by the mode setting circuit. The automatic bracket mode set in the setting circuit is canceled, and a change unit for changing the mode to the valve mode is provided.

(Embodiment of the Invention) FIG. 1 shows a basic configuration of an embodiment of the present invention, and FIG.
The flow chart is shown in the figure.

First, it is determined whether or not the first stroke operation of the release button is performed, and if the operation is not performed,
By operating the auto bracket mode setting means 101, the auto bracket mode can be set. Next, it is determined whether or not the valve mode setting means 102 is performing the valve mode setting. If the valve mode is set here, the valve mode priority means 103 prohibits the auto bracket mode setting by the operation of the auto bracket mode setting means 101, and if the valve mode is not set, the auto bracket mode is set. The auto bracket mode setting by the operation of the setting means 101 is accepted.

When the valve mode prioritizing means 103 accepts the auto bracket mode, the auto bracket shooting control means 104 automatically performs shooting with the exposure value changed a plurality of times, that is, auto bracket shooting.

FIG. 4 shows the arrangement of the operating members when the camera incorporating the device embodying the embodiment shown in FIG.
FIG. 6 shows the arrangement of the operating members when viewed from above, and FIG. 6 shows the arrangement of the operating members when viewed from the back. 4 to 6, reference numeral 1 denotes a release button, reference numeral 2 denotes an operation lever for selecting one of continuous shooting (C) and single shooting (S) shooting modes, reference numeral 3 denotes an operation lever for selecting a self-timer, 4
Is an exposure mode selection knob for selecting one of the exposure modes of shutter priority (Tv), aperture priority (Av), and manual (M). 5 is shutter time, aperture value, or exposure step number information at the time of auto bracket shooting ( For example, a so-called electronic dial in which two-bit conductive patterns and brushes having phases different from each other by 90 degrees are provided, and swM is a switch for setting an aperture value. In the manual exposure mode, the switch swM
The aperture value can be changed by pressing and operating the dial 5. Reference numeral 6 denotes a switch cover of the storage unit 7 that stores switches that are used less frequently, swABR is an auto bracket switch stored in the storage unit 7, and swME is a multiple shooting switch also stored in the storage unit 7. It is.

FIG. 3 shows a specific example of an electric circuit using a microcomputer COM for performing a series of operation control.

The light receiving element SPC receives the reflected light from the subject and outputs the received light signal to the operational amplifier OP1 having a high input impedance in which the compression diode D1 is connected to the feedback circuit. Operational amplifier O
P1 outputs logarithmically compressed subject luminance information Bv via a resistor R1. The variable resistor VR1 connected to the constant voltage source VG1 outputs the film sensitivity information Sv. The operational amplifier OP2, to which the resistor R2 is connected to the feedback circuit, calculates and outputs the photometric information Ev = (Bv + Sv). Metering information Ev is 4 by A / D converter ADC
It is converted into a digital value of bits and input to the input ports PG0 to PG3 of the microcomputer COM.

When the dial 5 is operated, the number corresponding to the number of clicks is counted by the dial interface circuit DIF, and the value is converted into 4-bit information and input to the input ports PH0 to PH3 of the microcomputer COM. . The information in the dial interface circuit DIF is reset when a pulse signal is input from the output port PE3 of the microcomputer COM. Depending on which mode is selected by the exposure mode selection knob 4, two exposure mode switches swSEL are turned on and off, and 2-bit information corresponding to the selected exposure mode is stored in the microcomputer COM.
Are input to the input ports PP0 to PP1.

When the battery BAT is loaded in the camera, the power Vbat is supplied to the microcomputer COM, the display system decoders TD, AD, FD, the dial interface circuit DIF and the like.
Further, when the first stroke switch sw1 connected to the input port PA0 is turned on by the first stroke of the release button 1, the potential of the output port PF becomes high level.
The transistor TRbat is turned on by the inverter INV and the resistor R4, and the voltage from the power supply Vbat is supplied as the power supply Vcc to operational amplifiers OP1 and OP2 for photometry, which consume a relatively large amount of power.

The input ports PA1-11 of the microcomputer COM are
The second stroke switch sw2 which is turned on by the second stroke of the release button 1, the mirror amplifier switch swMRUP which is turned off when the mirror is up and is turned on when the mirror is down, the charge completion detection switch swCGE which is turned on when the mechanical charge is completed, A film switch swFLM which is turned on each time one film is fed, a trailing switch swCN2 which is turned on when the trailing curtain is completed, and a self switch swSELF which is turned on when the self-timer is set by the operation lever 3. For example, the switch swCS, which is turned on when the continuous shooting mode is selected by the operation lever 2 and is turned off when the single shooting mode is selected, the aperture value setting switch swM, and the switch lid 6 are turned off. , Switch swSE that is turned on when opened
T, the multiple shooting switch swME, and the auto bracket switch swABR are respectively connected.

The bases of the transistors TR0 to TR2 are connected to the output ports PE0 to PE2 via the resistors R10 to 12, and the transistors TR0 to TR2 are connected.
~ TR2 is the first tension magnet MG0, the front curtain magnet MG1 that leads the front curtain, and the rear curtain magnet MG2 that runs the rear curtain.
The energization of each is controlled. The bases of the transistors TR3 to TR5 are connected to the output ports PD, PC and PB via the resistors R13 to R15. The transistor TR3 drives the charge motor MD, and the transistor TR4 drives the rewind motor MC.
The transistor TR5 controls the driving of the winding motor MB for winding the film at a high speed, respectively.

From the output port PTD, the content of the shutter time information register RGTv in the microcomputer COM is output to the decoder TD, which converts the content into a signal for shutter time display, and is composed of a connected liquid crystal etc. Display SE
The signal is output to G1.

A signal of "1" (meaning high level) or "0" (meaning low level) is output from the output ports PFL and PABR to the decoder AD, and the decoder AD outputs "1" from the output port PFL.
When the signal is input, the signal for blinking the auto bracket mark is output to the display SEG3 composed of a connected liquid crystal or the like. When the signal of "1" is input from the output port PABR, the signal for displaying the auto bracket mark is output to the display SEG3.

A signal of “1” or “0” is output from the output port PME to the display SEG4 composed of a liquid crystal or the like, and the display SEG4 displays a multiple shooting mark when the signal of “1” is input. .

From the output port PFD, the contents of the aperture value information register RGAv, the contents of the auto bracket step information register RGBR, or the contents of the multiplex number information register RGME in the microcomputer COM are output to the decoder FD. The decoder FD outputs a signal for numerical display corresponding to each of the above contents to a display SEG5 composed of a liquid crystal or the like connected thereto.

From the output port PAV, the contents of the aperture value information register RGAv in the microcomputer COM are output to the aperture control drive circuit DAV. The aperture control drive circuit DAV outputs information converted to actual aperture information to a connected driving actuator CAV, for example, a stepping motor, and drives this to perform appropriate aperture control.

Next, the operation of the microcomputer COM will be described with reference to the flowcharts of FIGS.

When the battery BAT is loaded in the camera and the power supply Vbat is generated, the microcomputer COM starts the operation from the start of the flowchart of FIG.

[Step 1] If the photographer makes only the first stroke of the release button 1, the first stroke switch sw
When the ON signal of 1 is input to the input port PA0, the process proceeds to step 2.

[Step 2] A signal of "1" is output from the output port PF to turn on the transistor TRbat to supply the power supply Vcc to each part. Then, the photometric timer is started. The photometric timer is for continuously supplying the power supply Vcc for a predetermined time after the input of the off signal of the first stroke switch sw1. Therefore, even if the photographer releases the release button 1, the photometric state is maintained for a predetermined time. Can be confirmed, and the setting information can be changed while watching the display on the exposure mode selection knob 4. This configuration can be easily performed by the hardware timer built in the microcomputer COM.

[Step 3] The photometric information Ev converted into a 4-bit digital value by the A / D converter ADC is stored in the internal register RG.
Store in Ev.

[Step 4] Whether the shutter priority mode is set or not is determined based on the input states of the input ports PP0 and PP1. If the shutter priority mode is set now, the process proceeds to step 5.

[Step 5] From the contents of the register RGEv, dial 5
The contents of the shutter information register RGTv, which stores the information set by the above operation, are subtracted, and the result (aperture information Av) is stored in the aperture information register RGAv. It is assumed that the contents of all registers in the microcomputer COM are retained while the battery BAT is loaded. Also batteries
When the BAT is first loaded, it is assumed that a frequently used value, for example, information of 1/125 seconds has been initialized.

[Step 6] The contents of the register RGBR, which stores the exposure step number information of the auto bracket, are stored in the aperture bracket step number register RGBA. Further, the contents of the shutter bracket stage number register RGBT are set to zero (0).

[Step 7] The state of the flag FABR indicating whether or not the auto bracket mode is set is determined. If the auto bracket mode is not currently set, the process proceeds to step 8.

[Step 8] The state of the flag FME indicating whether or not the multiple shooting mode is set is determined. If the multiple photographing mode has not been set, the process proceeds to step 9.

[Step 9] The flag FsAB indicating whether or not the auto bracket switch swABR has been operated is reset to 0. A flag Fs indicating whether or not the multiple shooting switch swME has been operated
Reset ME to 0.

[Step 10] The contents of the aperture information register RGAv are output from the output port PFD, and the contents of the shutter information register RGTv are output from the output port PTD. As a result, the aperture value obtained by the calculation is displayed on the display SEG5, and the set shutter time is displayed on the display SEG1.

[Step 11] The second stroke of the release button 1 is performed, and it is determined whether or not the ON signal of the second stroke switch sw2 is input to the input port PA1. If the ON signal of the second stroke switch sw2 is not input, the process returns to the start. Also the first stroke switch sw
While the 1 ON signal is being input, the calculation information can be obtained from the subject brightness information, the film sensitivity information, and the setting information by this routine, and these pieces of information can be displayed.

If the aperture priority mode has been set, the process proceeds to step 4 → step 12 → step 13.

[Step 13] Dial 5 from the contents of register RGEv
Then, the content of the register RGAv storing the information set by the operation of the aperture value setting switch swM is subtracted, and the result is stored in the shutter information register RGTv. Note that when the battery BAT is first loaded,
For example, it is assumed that the information of F5.6 is initialized.

[Step 14] The contents of the bracket stage number register RGBR storing the exposure stage number information of the auto bracket are stored in the shutter bracket stage number register RGBT. Further, the contents of the aperture bracket stage number register RGBA are set to zero.

Thereafter, in the case of the aperture priority mode, the same sequence as in the previous shutter priority mode proceeds, and the aperture value set in step 10 is displayed on the display SEG5, and the shutter time obtained by the calculation is displayed on the display SEG1. Is displayed.

If the manual exposure mode is set, the process proceeds to step 4 → step 12 → step 15.

[Step 15] The content of the register RGTM storing the shutter time information set by the operation of the dial 5 is stored in the shutter information register RGTv. This is because when the auto bracket shooting is set in the manual exposure mode, the content of the register RGTv changes for each shooting, so that the information set by operating the dial 5 is stored as it is. I do.

After that, the same sequence as in the case of the aperture priority mode is advanced, and the aperture value set in step 10 is displayed on the display SEG5.
The set shutter time is displayed on the display unit SEG1.

Next, a description will be given of the time of setting information by dialing while the photometric timer is operating. When the pressing of the release button 1 (first stroke) is stopped in the middle of the above-mentioned sequence, the off signal of the first stroke switch sw1 is input, and the program proceeds from step 1 to step 20.

[Step 20] Whether or not the opening operation of the switch lid 6 has been performed is determined from the state of the switch swSET. Switch lid 6
If the switch is still closed, the off signal of the switch swSET is input to the input port PA9, and the process proceeds to step 21.

[Step 21] It is determined whether or not the photometric timer is operating. Here, since it is immediately after the photometric timer is operated in step 2, the process proceeds to step 22.

[Step 22] Whether the shutter priority mode is set or not is determined based on the input states of the input ports PP0 and PP1. If the shutter priority mode is set now, the process proceeds to step 23.

[Step 23] Here, an information reading routine associated with the operation of the dial 5 is executed. Here, the information reading routine associated with the dial operation will be described with reference to FIG.

"Information reading routine" [Step 80] Information input to input ports PH0 to PH3 is stored in dial register RGH. At this time, in the register RGH, the number corresponding to the number of clicks on dial 5,
Information on whether the numerical value is positive or negative is stored depending on the rotating direction of the dial 5. That is, 4-bit information indicating how many steps to shift up or down from the current information is stored.

[Step 81] Output a pulse signal from the output port PE3. As a result, the value of the dial interface circuit DIF is reset to zero.

[Step 82] Return to the original step.

 Returning again to the flowchart of FIG.

[Step 24] Numerical value (contents of register RGH) set by dial operation and shutter information (register RGTv
Content) and add again to the shutter information register RGTv
To memorize. Further, the contents of the shutter information register RGTv are stored in the register RGTM.

[Step 25] It is determined whether or not a certain code indicating the valve mode located next to the longest shutter time is stored in the register RGTM. If it is not in the valve mode now, the process jumps to NEXT1, that is, to step 3.

In this way, pressing the release button 1 (first stroke)
The setting information can be changed by operating the dial 5 during the metering timer after the stop of the, and after that, by executing the routines from step 3 onward, the aperture value and shutter speed are set in step 10. Display SEG1, SEG5
Can be displayed respectively.

If the aperture priority mode is set, the process proceeds to step 22 → step 26 → step 27.

[Step 27] Here, as in step 23, an information reading routine accompanying the operation of the dial 5 is executed.

[Step 28] The numerical value (contents of the register RGH) set by the dial operation and the aperture value information (contents of the register RGAv) are added, and stored again in the aperture information register RGAv. Also, in the case of the aperture priority mode, the process jumps to NEXT1, that is, to step 3, and displays the aperture value and the shutter time at step 10 as in the shutter time priority mode.
SEG1 and SEG5 can be displayed respectively.

If the manual exposure mode is set, the process proceeds to step 22 → step 26 → step 29.

[Step 29] The on / off state of the aperture value setting switch swM is determined. In manual exposure mode, the aperture value setting switch swM is operated, and the dial value is used to change the aperture value, and only the dial operation is used to change the shutter speed. When the switch swM is on, the routine proceeds to the same routine (step 27) as in the aperture priority mode,
When it is off, the routine proceeds to the same routine (step 23) as in the shutter priority mode.

When a predetermined time elapses after the pressing operation of the release button 1 is stopped, the photometric timer operation ends. Accordingly, the program proceeds from step 21 to step 30.

[Step 30] The outputs of the output ports PTD, PFL, PABR, PME, and PFD are set to "0", and the displays SEG1 to SEG5 (however, the display SEG2 does not exist) are turned off. Also, the output of the output port PF is set to “0”, the transistor TRbat is turned off, and the power supply V
Stop supplying cc.

[Step 31] Similar to step 9, both the flag FsAB indicating whether the auto bracket switch swABR has been operated and the flag FsME indicating whether the multiple shooting switch swME has been operated are reset to zero.

Then the program jumps to the start. Therefore,
After the photometry timer ends, the standby mode of step 1 → step 20 → step 21 → step 30 → step 31 is repeated.

Next, a case where the auto bracket mode is set will be described. Before that, a case where only the opening operation of the switch lid 6 is performed for the auto bracket mode setting will be described.
When the switch cover 6 is opened, the switch swSE operates in conjunction with it.
T turns on, and this on signal is input to the input port PA9. Then, the program proceeds from step 20 to step 40.

[Step 40] The auto bracket switch swABR is determined. Since the switch lid 6 has just been opened and the operation of the auto bracket switch swABR has not been performed, the process proceeds to step 41.

[Step 41] The multi-shot switch swME is determined.
Similarly, since the multiple photographing switch swME has not been operated, the process proceeds to step 42.

[Step 42] The flag FsME indicating whether or not the multiple shooting switch swME has been pressed is determined. Battery BAT
Since the flag FsME has been reset to 0 in step 9 in the loading initial state and when the first stroke switch sw1 is on, the process proceeds to step 43.

[Step 43] The flag FsAB indicating whether or not the pressing operation of the auto bracket switch swABR is performed is determined. As in step 42, the flag is set in step 9
Since FsME is reset to 0, jump to step 21.

In this way, the switch lid 6 is opened, and nothing is executed if only the ON signal of the switch swSET is input.

Next, from the above state, auto bracket switch swABR
The following describes a case where the pressing operation is performed once. When the pressing operation of the auto bracket switch swABR is performed, an ON signal is input to the input port PA11 accordingly. Then the program proceeds from step 40 to step 44.

[Step 44] It is determined whether the content of the register RGTM is in the valve mode. If it is in the valve mode, it returns to the start and does not enter the auto bracket mode. If the valve mode has not been set, the process proceeds to step 45.

[Step 45] The flag FsAB indicating that the auto bracket switch swABR is turned on is set to 1, and the flag FsME indicating that the multiple shooting switch swME is turned on is set to 0.
Reset to.

[Step 46] The outputs of the output ports PTD, PFL, PABR, PME, PFD are set to "0", and the displays of the display devices SEG1 to SEG5 are all turned off. Next, set only the output of the output port PABR to “1”, and
Turn on the SEG3 auto bracket mark. This allows the photographer to clearly know that the auto bracket mode has been set.

[Step 47] A flag FABR indicating that the auto bracket mode has been set is set to 1.

[Step 48] Similar to Step 23 or Step 27
An information reading routine associated with the operation of the dial 5 is executed. In this case, in step 80, for example, dial 5
If step number information of 0.5 is set by, `` −0.
If the number of stages is 5,0,0.5, and if 1 is set, "-1,
The preset three auto bracket shootings in which the exposure is automatically changed at the number of steps of "0, 1" are performed. In addition, the shooting with the number of steps of "-0.5, 0, 0.5" is
The standard exposure value calculated by calculation is -0.5 steps below the exposure value, the standard exposure value, and the standard exposure value is 0.5 steps above the exposure value. It means to be performed continuously.

[Step 49] The contents of the bracket stage number register RGBR and the contents of the dial are added and stored in the register RGBR again. As described above, it is assumed that the minimum resolution by one click of the dial 5 can be freely set every 0.5 steps or every step. If the shutter time is different from the resolution of the aperture value, a program for increasing the contents of the register RGBR to an integral multiple may be inserted. Here, since it is not related to the present invention, detailed description is omitted. The contents of the register RGBR are output from the output port PFD, and a numerical value indicating the number of stages, for example, “0.5” is displayed on the display SEG5. The decoder FD and display SEG5 used at this time are also used for aperture display. The aperture value is decoded from Av of the apex value to the F number and the decoding of the auto bracket is, for example, 0.5.
Since it is a numerical value for each stage, it is necessary to change the decoding content, but if the output from the output port PFD has, for example, 5 bits, 32 types of data can be sent, so the aperture value display is F1. There are a total of 14 types when the number of steps from 4 to F32 is 0.5, and a total of 30 types when the auto bracket display is from 0 to 5, and there are 31 types with a blank code. The decoder FD can determine which information is added by adding a certain constant when sending data, and an appropriate numerical value can be displayed.

[Step 50] A flag FME indicating whether or not the multiple photographing mode is set is determined. When not in the multiple shooting mode, the process returns to the start. If the mode is the multiple shooting mode, the process proceeds to step 51.

[Step 51] The content of the multiplex photographing count register RGME is set to "3". This is because the number of times of auto bracketing is determined in advance to be three times, so that even if the number of times of multiplex shooting is set arbitrarily, it is forcibly set to three times to prevent a photographer's operation error and to prevent erroneous exposure. This is to eliminate the danger.
Then the program returns to the start. Also switch once
When the swABR ON signal is input, step 45 follows.
Since the flag FsAB is set to 1, the program will continue from step 40 → step even if the off signal of swABR is input.
41 → step 42 → step 43 → step 48, and it is possible to continue to maintain the auto bracket step number change mode on the dial 5, and the photographer should operate the dial 5 with the pressing operation of the switch swABR stopped. Is possible.

The release of the auto bracket stage number change mode can be performed by turning on the first stroke switch sw1, or closing the switch cover 6 and turning off the switch swSET. That is, when the ON signal of the first stroke switch sw1 is input, Step 1 → Step 2 → Step 3 →
The program advances, and the flag FsAB is 0 in step 9.
And the display is also switched to the normal display in step 10. When an off signal of the switch swSET is input, Step 20 → Step 21 → Step 30 → Step 31
In the process of the program to proceed to, the auto bracket mark display disappears in step 30, and the flag FsAB is displayed in step 31.
Is not reset and the process does not proceed to the automatic bracket stage number change mode again.

Next, the exposure calculation in the auto bracket mode will be described. In the shutter priority mode, the contents of the bracket stage number register RGBR are stored in the aperture bracket stage number register RGBA as described in step 6, and in the shutter priority mode and the manual exposure mode, the shutter is performed as described in step 14. Each is stored in the bracket stage number register RGBT. In step 7, since the auto bracket mode is set and the flag FABR is set to 1,
Go to step 52.

[Step 52] It is determined whether the content of the bracket step number register RGBR is zero. If the content is zero, three shootings are performed with the same exposure (standard exposure in the embodiment), and since it is meaningless, it is necessary to prohibit the auto bracket shooting. So in this case step
Continue to 53.

[Step 53] Flag indicating auto bracket mode
Reset FABR to 0. Also, the output of the output port PABR is set to “0”, and the auto bracket mark display is turned off.

Next, by proceeding to step 8, the auto bracket exposure calculation is not performed, the flag FsAB is reset to 0, and a normal routine is executed.

In step 52, a register for the number of bracket stages
If the content of RGBR is not zero, it is necessary to perform the exposure calculation and the display of the auto bracket mark based on the step number information.

[Step 54] The output of the output port PABR is set to "1", and the auto bracket mark is displayed. This is because when the switch swSET is turned off by closing the switch lid 6 from the auto bracket mode setting state, all the display is turned off in step 30, so it is necessary to turn on the light again when the first stroke switch sw1 is turned on. Because there is.

[Step 55] It is determined whether or not the first stroke switch sw1 is turned on. If it is on, proceed to step 56.

[Step 56] The contents of the aperture information register RGAv and the aperture bracket stage number register RGBA are added and stored again in the register RVAv. Also, shutter information register RG
The contents of Tv and the contents of the shutter bracket stage number register RGBT are added and stored again in the register RGTv. this is,
This means that the aperture information calculated in the shutter priority mode and the shutter time information calculated in the aperture priority mode are changed according to the number of auto bracket steps. That is, if the auto bracket step number is set so as not to become a negative number at the time of step 49, the value after the calculation at step 56 will be the exposure value on the under side of the standard exposure value.
Also, in the manual exposure mode, since the same step 14 as in the aperture priority mode is passed, the shutter speed is changed and the aperture value was not changed like the conventional camera, so the depth of field is constant, It is possible to shoot with auto bracket, which switches only the exposure.

In step 55, the first stroke switch sw1
When it is determined that is turned off, the exposure calculation in step 56 is not performed and the standard exposure value is displayed in step 10 because the photometric timer is in operation. Even in this case, since the first stroke of the release button 1 is always performed when shooting, step 56 is always passed, so there is no problem in auto bracket shooting.

As described above, in the auto bracket mode, when the first stroke switch sw1 is turned on, the exposure value when the auto bracket is applied, that is, the exposure value on the under side is displayed, and the metering timer operation is performed. The standard exposure value will be displayed. This allows the photographer to easily recognize the exposure value of the auto bracket.

Next, a case where the valve mode is set by operating the dial 5 after setting the auto bracket mode will be described. Since bracket photography in bulb photography is basically meaningless, it is more effective to cancel the auto bracket mode. Therefore, if it is determined in step 25 that the mode is the valve mode, the process proceeds to step 57.

[Step 57] The output of the output port PABR is set to “0” to turn off the auto bracket mark display. Also, the flag FABR of the auto bracket mode is reset to 0.

Next, the case of setting the multiple shooting mode will be described. When the ON signal of the switch swME is input in conjunction with the opening of the switch lid 6, the process proceeds from step 41 to step 60.

[Step 60] The flag FsME indicating that the multiple shooting switch swME is turned on is set to 1. The flag FsAB, which indicates that the auto bracket switch swABR is turned on, is set to 0.
Reset to.

[Step 61] The outputs of the output ports PTD, PFL, PABR, PME, PFD are set to “0”, and all displays are turned off. Next, the output of only the output port PME is set to "1", and the multiple shooting mode mark is displayed on the display SEG4.

[Step 62] Set the flag FME indicating the multiple shooting mode to 1
Set to.

[Step 63] It is determined whether or not the auto bracket mode is set. If the mode is the auto bracket mode, the process proceeds to step 64.

[Step 64] Since the mode is the auto bracket mode,
Similar to step 51, the number of times of multiple shooting is forcibly set to 3, that is, the content of the multiple shooting number register RGME is set to "3".

If the auto bracket mode has not been set in step 63, the process proceeds to step 65.

[Step 65] As in Step 48 and the like, an information reading routine accompanying the dial operation is executed.

[Step 66] The contents of the multiplex number register RGME and the contents of the dial register RGH are added and stored again in the register RGME. Since the number of times of multiplexing is an integer, if the resolution of one click of the dial 5 is 0.5 steps, the contents of the dial register RGH are doubled and then added. Further, it is necessary to prevent the contents of the register RGH from being a negative number, but it is omitted here.

[Step 67] The contents of the multiplex number register RGME are output from the output port PFD and displayed on the display SEH5.

Then the program returns to the start. Also, once the switch swME ON signal is input, the flag FsME is set to 1 in step 60, and then the switch swME
Step 41 → Step 42 even if the ME off signal is input
→ Proceeding to step 63, it is possible to maintain the multiplex shooting number setting mode. To switch from the auto bracket step number change mode to the multiple shooting setting mode, use the switch sw
You only have to turn ME on once, and switch back and forth to switch
It is clear from the flow of FIG. 7 that it is sufficient to turn on swABR once.

Next, if the number of times of multiplex is set once and then the number of times of multiplex is set to zero (0), it is necessary to cancel the multiplex shooting mode and turn off the multiplex shooting mark. This program is executed by proceeding to step 68 since the flag FME is set to 1 in step 8.

[Step 68] If the content of the multiple image taking number register RGME is zero, the process proceeds to step 69.

[Step 69] The flag FME indicating the multiple photographing mode is set to 0.
Reset to. Also, set the output of output port PME to “0”,
Turn off the display of the multiple shooting mark.

When the content of the register RGME for multiple shooting times is not zero in step 68, the process proceeds to step 70.

[Step 70] The output of the output port PME is set to "1" and the multiple shooting mark is displayed. This is because all the displays are turned off in step 30, so that the photographer is informed that the multiple shooting mode is set when the first stroke of the release button 1 is made again.

 As described above, the preparation stage for photographing is completed.

Next, a sequence after the second stroke of the release button 1 is performed will be described. When the second stroke of the release button 1 is performed and the ON signal (release signal) of the second stroke switch sw2 is input to the input port PA1,
The process proceeds from step 11 in FIG. 7 to step 100 in FIG.

[Step 100] Whether the auto bracket mode is set is determined by the state of the flag FABR. If the mode is the auto bracket mode, the process proceeds to step 101; otherwise, the process proceeds to step 102.

[Step 101] Set the output of the output port PFL to "1" and make the auto bracket mark on the display SEG3 blink. Thus, the photographer can know that the auto bracket photographing has started.

[Step 102] Self-switch SELF to input port PA6
It is determined whether or not the ON signal of is input. If the ON signal has been input, the photographing is performed by the self-timer, so the flow proceeds to step 103; otherwise, the flow proceeds to step 104.

[Step 103] The self-timer measures 10 seconds.

[Step 104] The content of the aperture information register RGAv is output from the output port PAV. As a result, the diaphragm control drive circuit DAV exchanges the contents of the register RGAv with actual diaphragm information, and starts diaphragm control via the diaphragm drive actuator CAV such as a stepping motor.

[Step 105] A pulse signal is output from the output port PE0, the transistor TR0 is turned on, and the magnet MG for mirror up, which is the first combination magnet.
Energize to 0. As a result, the mirror is raised by the known spring force.

[Step 106] It is determined whether or not the ON signal of the switch swMRUP for detecting the mirror-up end is input to the input port PA2. Here, this loop is repeated until the ON signal is input, that is, until the mirror is completely moved up.

[Step 107] Since the content of the shutter information register RGTv is an apex value, it is converted (expanded) into real-time data.

[Step 108] A pulse signal is output from the output port PE1, and the transistor TR1 is turned on to supply electricity to the shutter front curtain magnet MG1. As a result, the shutter front curtain precedes.

[Step 109] It is determined whether the content of the register RGTM is in the valve mode. If in valve mode, go to step 110, otherwise step 111.
Go to.

[Step 110] Wait until an off signal of the second stroke switch sw2 is input. This is because in the valve mode, it is necessary to keep the shutter open while the ON signal of the second stroke switch sw2 is being input.

[Step 111] Since the mode is not the valve mode, step 1
In step 07, the real time is counted based on the decompressed data, and the calculated shutter time is counted.

[Step 112] When the real-time counting is completed, a pulse signal is output from the output port PE2, and the transistor TR2 is turned on to supply electricity to the shutter rear curtain magnet MG2. As a result, the shutter rear curtain runs.

[Step 113] It is determined whether or not the ON signal of the shutter rear curtain switch swCN2 is input to the input port PA5. Here, this loop is repeated until the ON signal is input, that is, until the traveling of the rear curtain of the shutter is completed.

[Step 114] The output of the output port PAV is set to “0”.
As a result, the aperture returns to the open state.

[Step 115] The output of the output port PD is set to "1" and the transistor TR3 is turned on to rotate the charging motor MD for mirror down and shutter charging.

[Step 116] It is determined whether or not the multiple shooting mode is set based on the state of the flag FME. If in the multiple shooting mode, go to step 117; otherwise, go to step 1
Go to 20.

[Step 117] 1 is subtracted from the contents of the multiplex number register RGME, and stored again in the register RGME.

[Step 118] It is determined whether or not the content of the multiplex number register RGME is zero. If zero, step 119
If not zero, go to step 121.

[Step 119] The content of the multiplex number register RGME is 0
Means that the multiple photographing has been completed, the flag FME indicating the multiple photographing mode is reset to 0. Further, the output of the output port PME is set to “0”, and the display of the multiple shooting mark is turned off.

[Step 120] The timer for film feeding is started. Further, the output of the output port PB is set to “1”, and the transistor TR5 is turned on to rotate the film feeding motor MB.

If the multiple photographing mode is continued, the contents of the multiplex number register RGME are not zero, so that the process proceeds from step 118 to step 121, and since the film does not pass through step 120, the film is not fed. Therefore, multiple photographing is performed. When the multiple shooting is completed, the content of the register RGME becomes zero, so that the film is fed in step 120 after releasing the multiple shooting mode as described above.

[Step 121] It is determined whether or not the ON signal of the charge completion detecting switch swCGE is input to the input port PA3. When the ON signal is not input, that is, when the charging is not completed, the process proceeds to step 123, and when the charging is completed, the process proceeds to step 122.

[Step 122] Since charging is completed, the output of the output port PD is set to “0”, and the power supply to the charging motor MD is cut off.

[Step 123] It is determined whether or not the on signal of the switch swFLM, which is turned on each time one frame of film is completed, is input to the input port PA4. When the ON signal is not input, that is, when the feeding of one film of film is not completed, the process proceeds to step 124, and when it is completed, the process proceeds to step 125.

[Step 124] The state of the film feeding timer is determined. When the film is over, no more film can be fed, so the switch swFLM does not turn on,
In such a case, the time counting by the film feeding timer, which is a one-second timer, for example, ends. When the timing is completed, the process proceeds to step 150, and when not completed, the process returns to step 121,
The above sequence (step 121 → step 123) is repeated.

[Step 125] If it is detected in step 123 that the off signal of the switch swFLM has been input, the output of the output port PB is set to “0”, the transistor TR5 is turned off, and the film feeding motor MB is stopped.

[Step 126] It is determined whether or not the auto bracket mode is set based on the state of the flag FABR. If it is not the auto bracket mode, the process proceeds to step 132, and if it is, the process proceeds to step 127.

[Step 127] It is determined whether or not the auto bracket shooting has been performed three times. As described above, the auto bracket shooting is a shooting that is continuously performed at three exposure values of under, standard, and over. If the three shootings are not completed, the process proceeds to step 128.

[Step 128] The contents of the aperture bracket step register RGBA are subtracted from the contents of the aperture information register RGAv, and stored again in the register RGAv. Also, the contents of the shutter bracket step number register RGBT are subtracted from the contents of the shutter time information register RGTv, and the register RG is again set.
It is stored in Tv. Here, the same program may be used in the shutter priority, the aperture priority, and the manual exposure mode as in step 56 in FIG. 7 because the contents of the registers RGBA and RGBT are changed in steps 6 and 14. It should be clear from this arithmetic expression (subtraction formula) that the second exposure is the standard exposure and the third exposure is the overexposure.

[Step 129] Register RGA from output ports PFD and PTD
The contents of v and RGTv are output, and the shutter speed information and aperture value information at this time are displayed.

Then the program jumps to NEXT2, step 104. In other words, regardless of the on / off state of the second stroke switch sw2 (regardless of whether or not the release signal is generated), the next photographing is started. In addition, even if the photographing at this time is in the self mode, the second and third photographing starts the next photographing without executing the self-timer.

[Step 130] It is determined whether or not the off signal of the first stroke switch sw1 is input. At this time, if no off signal is input, step 128, step 12
You can see the display calculated in 9. In other words,
At this time, the final overexposure value can be confirmed. Therefore, by seeing the first underexposure value in the discrimination display in step 55, it is necessary to confirm all the exposure displays of the underexposure value, the standard value, and the overexposure value during the auto bracket shooting in the shooting sequence. Becomes possible. When the off signal of the first stroke switch sw1 is input, the routine proceeds to step 131.

[Step 131] The flag FABR indicating the auto bracket mode is reset to 0. Also, set the output of the output port PFL to "0" and turn off the blinking display of the auto bracket mark.

Next, the program returns to the start and enters the standby mode.

Next, the case where the auto bracket mode is not set will be described. In this case, since the flag FABR is 0, step
From 126, proceed to step 132.

[Step 132] Switch sw input to input port PA7
It is determined whether the continuous shooting mode is the single shooting mode based on the on / off state of CS. In the case of the continuous shooting mode, the process returns to the start. In this case, the release button 1 is pressed, and
Since the ON signal of the second stroke switches sw1 and sw2 has been input, the next shooting is started. In the case of the single shooting mode, the process proceeds to step 133.

[Step 133] Wait for the OFF signal of the first stroke switch sw1 to be input. Since the single shooting mode is set, the process does not proceed to the next shooting sequence unless the photographer stops pressing the release button 1. When the off signal is input, the process returns to the start.

Next, the case where the film is completed during the photographing will be described. In this case, as described above, the time measurement by the film timer, for example, a one-second timer is terminated.
Proceed to step 150 from step 4.

[Step 150] The output of the output port PC is set to “1”, and the transistor TR5 is turned on to rotate the rewind motor MC. Thereby, the rewinding of the film is started.

[Step 151] A rewind timer used to detect whether or not the film rewinding is completed is started.

[Step 152] It is determined whether the state of the film switch swFLM has changed. If it changes, step 151
Return to and restart the rewind timer. If there is no change, the process proceeds to step 153.

[Step 153] It is determined whether or not the rewind timer has finished counting. Step 15 if not finished
Return to 2.

As can be seen from the above, the loop of steps 152 and 153 proceeds during the feeding of one frame, and when the completion of feeding of one frame is detected, the process proceeds from step 152 to step 151. When rewinding the film, this loop is executed. Will repeat. After that, when all the films are caught in the patrone,
For example, the patrone stops rotating and the film switch
The status change of swFLM disappears. When this is detected, the process proceeds to step 154.

[Step 154] The output of the output port PC is set to "0", the transistor TR5 is turned off, and the rewinding motor MC is stopped. Thereby, the rewinding of the film is completed.

[Step 155] The flag FABR indicating the auto bracket mode is reset to 0. Also, set the output of the output port PFL to "0" and turn off the blinking display of the auto bracket mark.

 Then the program returns to the start.

Also, if the film ends during the auto bracket shooting, that is, if you normally have to shoot three times in succession, step at the first or second frame.
You enter the routine after 150. In such a case, if the auto bracket shooting is continued on the newly loaded film, there is a risk that the subject is different and the photographer may misunderstand, so let the photographer know that, It is desirable to cancel the auto bracket mode. Looking at this in the flowchart of FIG. 9, the steps
When the film is finished after the blinking display of the auto bracket mark in 101, the film rewinding is automatically performed. During the rewinding of the film, the blinking display of the auto bracket mark has not been released yet. Therefore, by displaying an auto bracket mark that is not normally displayed during the film rewind,
The photographer can know that the film has ended without completely ending the auto bracket shooting. That is, the warning is displayed. Further, since the flag FABR indicating the auto bracket mode is reset to 0 in step 155, there is no inconvenience that the auto bracket shooting is continued on the newly loaded film as in the conventional camera.

According to the present embodiment, when the valve mode is set, the auto bracket mode setting and the display indicating that the mode is set are prohibited (step 44 → start). Bulb photography is executed according to the depression of the release button, and there is no risk that the photographer will make an erroneous operation.

(Effects of the Invention) As described above, according to the present invention, when the valve mode is set in the mode setting circuit, the mode setting operation means performs the operation for the auto bracket mode setting, and the mode of the number of mode setting times is set. Is prohibited from being changed to the auto bracket mode, and when the auto bracket mode is set in the mode setting circuit, the auto setting in the mode setting circuit is performed by the operation for valve mode setting by the mode setting operation means. Since the bracket mode is canceled and the mode is changed to the valve mode, it is possible to prevent both the valve mode and the auto bracket mode from being set, and one of the valve mode and the auto bracket mode is preset. When the setting operation of the other mode is performed, As a mode, there is no valve mode, and the valve mode can be preferentially set when both modes are set.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart thereof, and FIG. 3 is a microcomputer installed in a camera incorporating the embodiment shown in FIG. 1 and its peripherals. FIG. 4 is a front view of the camera, FIG. 5 is a top view of the same, FIG. 6 is a back view of the same, and FIGS. 1 Release button, 2, 3 Operation lever, 4 Exposure mode selection knob, 5 Dial, 6 Switch lid,
7… Storage section, swABR …… Auto bracket switch, s
wME ... Multiple shooting switch, COM ... Microcomputer, TD, AD, FD ... Decoder, SEG1 to SEG5 ... Display, DI
F: Dial interface circuit, MB, MC, MD ... Motor, 101 ... Auto bracket mode setting means, 103 ...
… Valve mode priority means, 104 …… Auto bracket shooting control means.

Claims (2)

[Claims] 1. A mode setting circuit for setting the auto bracket mode and the valve mode in response to an operation of a mode setting operation means for manually setting the auto bracket mode and the valve mode, and the mode setting circuit. When the auto bracket mode is set, the auto bracket shooting control means for automatically changing the exposure value for each shooting frame and shooting for each shooting frame, and when the valve mode is set by the mode setting circuit And a bulb photographing control means for performing bulb photographing in which the shutter is exposed while the release operating member is operated, and an auto bracket mode setting by the mode setting operating means when the valve mode is set by the mode setting circuit. To change the mode of the mode setting circuit to the auto bracket mode. And an auto bracket set in the mode setting circuit by an operation for setting the valve mode by the mode setting operation unit when the auto bracket mode is set in the mode setting circuit. An exposure control device for a camera, comprising: a changing unit that cancels a mode and changes the mode to a valve mode. 2. The mode setting operation means includes a first operation member for setting an auto bracket mode, and the first operation member.
And a second operation member for setting the valve mode, which is arranged so as to be operable independently of the operation member, and the mode setting circuit automatically operates by operating the first operation member. A first setting unit for setting the bracket mode and a second setting unit for setting the valve mode by operating the second operation member.
The setting means, the prohibiting means responds to the operation of the first operating member by the first setting portion when the valve mode is set in the second setting portion. Setting is prohibited, and further, the changing means operates the second operation member to operate the first operation member when the auto bracket mode is set in the first setting portion.
The exposure control device for a camera according to claim 1, wherein the auto bracket mode set in the setting section is cancelled.