JPS6337329A - Exposure control device for camera - Google Patents

Abstract

PURPOSE:To execute original picture photographing of auto bracket photographing, even in case of auto bracket photographing in a manual exposure mode, by providing an information variable means for varying the manually set shutter second time information at every photographing, when an exposure mode is set to a manual exposure mode. CONSTITUTION:When the second stroke operation of a release button is executed, whether an auto bracket mode is set or not is discriminated, and an auto bracket photographing control means 106 controls a diaphragm mechanism and a shutter mechanism, etc., based on a shutter second time and a set diaphragm value, which are used for the first auto bracket photographing which are varied by a shutter second time and its variation quantity information by an information variable means 101, and starts auto bracket photographing. The shutter second time in case of the first auto bracket photographing, which is obtained by the information variable means 101 is stored in an exposure value storage means 107. When the auto bracket photographing is ended, whether the auto bracket photographing is executed plural times or not is discriminated by a photographing frequency discriminating means 108.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to an improved exposure control bag for a camera equipped with an auto-bracketing control means for performing continuous shooting while automatically changing exposure values. be.

Note that the above-mentioned auto bracketing (more precisely called auto exposure bracketing) refers to the exposure value of the camera (in the case of automatic exposure, exposure control that is automatically calculated from the subject brightness and film sensitivity ((i) of manual exposure). In case,
This refers to the offset of the camera relative to the shutter speed and aperture value set by the photographer.Simply put, when photographing a certain subject, multiple photos are taken by changing the exposure value in several stages. This means that the camera automatically takes pictures.

(Background of the Invention) Conventionally, auto bracket shooting in manual exposure mode (a mode in which the aperture value and shutter speed are manually set) leaves the shutter speed fixed and changes the aperture value each time the shot is taken.
This method is based on exposure information that differs for each shooting, which is obtained from the changed aperture value information and the shutter speed. However, the original meaning of auto-bracket photography is to photograph the same subject at different exposure levels, and all parameters other than exposure need to be the same.

If we consider a conventional camera that changes the aperture value, the depth of field changes each time the auto bracket is executed.

The problem arises that the photograph itself changes, and the original auto bracketing cannot be performed.

(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 that allows photography to be performed in the original manner in auto-bracketing even when auto-bracketing is performed in manual exposure mode. The goal is to provide the following.

(Features of the Invention) In order to achieve the L2 objective, the present invention provides an information variable means that changes manually set shutter time information for each photograph when the exposure mode is set to manual exposure mode. Accordingly, in the manual exposure mode, auto-bracketing photography is executed using the manually set shutter time information that is changed every 1M shadow and the manually set aperture value. .

(Embodiment of the Invention) FIG. 1 shows the basic configuration of an embodiment of the invention, and FIG. 2 shows its flowchart.

When the photographer performs a first stroke operation of the release button, photometric information is calculated by the photometric circuit of the camera, and the information is input to the information variable means 101. Here, if the Tvl destination mode is selected by the exposure mode selection means 102.

The information variable means 101 obtains the aperture value from the shutter speed set by the information setting means 103 and the photometric information, and then sets the aperture value by the level change amount setting means 104 and stores it in the level change amount storage means IO5. The amount of level change information to be changed during auto bracket shooting is read as the amount of change in aperture. Also, if the Avi destination mode is selected, the shutter speed is calculated from the set aperture value, and the amount of level change information is read as the amount of change in aperture. If the manual exposure mode is selected, the shutter time of the manual settings is read from the information setting means 103, and the level change amount information is the amount of change in the shutter time. The following describes the auto bracket shooting when the manual exposure mode is selected.

Thereafter, when the photographer performs a second stroke operation of the release button, it is determined whether or not the auto bracket mode is set, and since the auto bracket mode is set here, the auto bracket shooting control means 106 operates as described above. The information variable means IO1 controls the diaphragm mechanism, shutter mechanism, etc. based on the shutter time and the set aperture value used for the first auto-bracketing shooting, which are changed based on the shutter time and its change amount information. , starts auto bracketing shooting. The shutter speed obtained by the information variable means 101 in the first auto bracket photographing is stored in the exposure value storage means 107. When the auto-bracketing shooting is completed, the shooting number determining means 108 determines whether or not the auto-bracketing shooting has been performed a predetermined number of times.
If the predetermined number of times has not been reached, similar operation instructions will be given thereafter. In other words, the auto-bracketing photography control means 106 changes the shutter time and setting for each photography, which is inputted from the information variable means 101 for each photography, until the photography count determining means 108 detects that the predetermined number of times has been reached. Photographing is performed continuously based on the selected aperture value. Note that the information variable means lot is in the manual exposure mode.

Every time a shooting end signal is input from the number of shots determining means 108, the shutter time information for the previous auto-bracketing shot stored in the exposure value storage means 107 is retrieved, and the shutter speed for the next shooting is determined according to the amount of level change. The auto-bracketing control means 10 changes the second information and sends the result.
6 and is also stored as update information in the exposure value storage means 107. I repeat this action.

FIG. 4 shows the arrangement of each operating member when looking from the front of the camera incorporating the device embodying the embodiment shown in FIG. 1, and FIG. 5 shows the arrangement of each operating member when looking from above. Figure 6 shows the arrangement of each operating member when viewed from the back side.
In Figures 6 to 6, l is a release button, 2 is an operation bar for selecting a shooting mode of continuous shooting (C) or single shooting (S), 3 is an operation lever for selecting a self-timer, and 4 is an operation lever for selecting a self-timer. 5 is the exposure mode selection knob that selects the exposure mode of shutter priority (Tv), aperture priority (Ay), or manual (M), and 5 is the shutter speed, aperture value, or exposure step number information for auto bracketing ( For example, swM is a so-called electronic dial that is equipped with a 2-bit conductive pattern and a brush that are 90 degrees out of phase with each other. The aperture value can be changed by pressing the switch swM and operating the dial 5 in the manual exposure mode. Reference numeral 6 designates a switch lid of a storage section 7 that stores switches that are used less frequently, swABR represents an auto-bracketing switch that is stored in the storage section 7, and swME represents a multiplex shooting switch that is also stored in the storage section 7. It is.

FIG. 3 shows a specific example of an electric circuit in which a microcomputer COM is used to control a series of operations.

The light-receiving element SPC receives reflected light from the subject and outputs a light-receiving signal to a high input impedance operational amplifier OP1 having a compression diode D1 connected to a feedback circuit. The operational amplifier OPI outputs logarithmically compressed object brightness information By via the resistor R1. 5 connected to constant voltage source VGI
(The variable resistor VR1 outputs the film sensitivity information Sv. The arithmetic unit OP2, which has the resistor R2 connected to the feedback circuit,
The photometric information Ev=(By+Sv) is calculated and output.

The photometric information Ev is converted into a 4-bit digital value by the A/D converter ADC, and then converted to a 4-bit digital value by the microcomputer CO.
It is input to M's input port PGO-PG3.

When the dial 5 is operated, a 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 PG3 of the microcomputer COM. . The information in the dial interface circuit DIF is such that the pulse signal is sent to the output port P of the microcomputer COM.
It is reset by input from E3. Depending on which mode is selected by the exposure mode selection knob 4, the two series of exposure mode switches 5w5EL are turned on and off, and 2-bit information corresponding to the selected exposure mode is sent to input ports PP0-PPI of the microcomputer COM. is input.

When the battery BAT is loaded into the camera, the microcomputer COM and display system decoder TD are activated.

AD, FD and dial interface circuit DI
A power supply Vbat is supplied to F and the like. Also, the release button l
When the first stroke switch SW1 connected to the input capacitor (PAO) is turned on by the first stroke of The voltage from Vbat is supplied as a power supply vCC to circuits that consume a relatively large amount of power, such as photometric operational amplifiers OPI and OP2.

Microcomputer COM person capo) PA1~11
There is a second stroke switch s w2 that is turned on by the second stroke of the release button L; a mirror up switch sw that is turned off when the mirror is up and turned on when the mirror is down;
MRUP, a Charging completion detection switch swCGE, which turns on when mechanical charging is completed, film l
Film switch s that turns on every time frame feeding is completed
wFLM, trailing curtain switch s that turns on when trailing curtain travel is completed
wCN 2. A self-switch 5w that is turned on when the self-timer is set by the operating lever 3
5ELF, m Note W A switch 5wC5, which is turned on when continuous shooting mode is selected by the operation lever 5, and turned off when single shooting mode is selected, the aperture value setting switch swM, and the switch lid 6 are closed. Switch 5w5 turns off when opened and turns on when opened.
ET, the multiplex photographing switch swME, and the auto-bracketing switch swABR are connected to each other.

The bases of transistors TR0-TR2 are connected to the output ports PE0-PE2 via resistors RIO~12, and the transistors TR0-TR2 are connected to the first clamping magnet (MG).
It controls the energization of the leading curtain magnet MGl that causes the O1 leading curtain to run and the trailing curtain magnet MG2 that causes the trailing curtain to run. Also, resistors R13 to output ports PD, PC, and PB are connected to the output ports PD, PC, and PB.
Transistor TR3 drives the charging motor MD, transistor TR4 drives the rewinding motor MC, and transistor TR5 unwinds the film at high speed. The respective drives of the winding motors MD are controlled.

Output Capo) Microcomputer 200M from PTD
The contents of the shutter time information register RGTv are output to the decoder TD, and the decoder TD converts the contents into a signal for displaying the shutter time, and sends this signal to the connected display 5EGl, which is composed of a liquid crystal, etc. Output.

Output ports PFL and PABR output signals of "l" (meaning high level) or O (meaning low level) to decoder AD, and decoder AD receives the signal of "l" from output port PFL. If input, a signal for displaying a bracket mark point reduction is output to the connected display 5EG2, which is composed of a liquid crystal or the like. When a signal of "°1 PA" is input from the output port PABR, a signal for displaying a bracket mark is outputted to the display 5EG2.

From the output boat PME, a signal of "t" or "O°" is output to the display device 5EG4, which is composed of a liquid crystal, etc., and the display device 5EG4 displays a multiple shooting mark when the signal of "1H" is input. .

From the output boat PFD, a microcomputer 200M
The contents of the aperture value information register RGAv, the contents of the auto bracketing step information register RGBH, or the contents of the multiplex number information register ROMH are output to the decoder FD. The decoder FD outputs a signal for numerical display corresponding to each of the above-mentioned contents to a connected display device 5EG5 composed of a liquid crystal or the like.

From the output boat PAV, the contents of the aperture value information register RGAv in the microcomputer 200M are output to the aperture control drive circuit DAY. The aperture control drive circuit DAV is connected to the drive actuator CAT.
For example, the information converted into actual aperture information is output to a stepping motor or the like, and this is driven to perform appropriate aperture control.

Next, the operation of the microcomputer COM will be explained with reference to flowcharts shown in FIGS. 7-9.

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

[Step l] Suppose that the photographer only makes the first stroke of the release button l, and the first stroke switch s
When the wl on signal is input to the PAO,
Proceed to step 2.

[Step 2] Output a “1” signal from the output capo-PF, turn on the transistor TRbat, and turn on the power supply Vc.
Then, the photometry timer is started. The photometry timer is for continuously supplying the power supply Vcc for a predetermined period of time from the input of the off signal to the first stroke switch swl.

This allows the photographer to check the metering status for a predetermined period of time even if he or she takes his hand off the release button L, and presses the exposure mode selection knob 4.
You can change the setting information while viewing the display. Note that this configuration can be easily performed using a hardware timer built into the microcomputer COM.

[Step '3] 4 by A/D converter ADC
The photometric information Ev converted into a bit digital value is stored in an internal register RGEv.

[Step 4] It is determined whether the shutter priority mode is set based on the manual state of the input ports PPO and PPl. If the shutter priority mode is currently set, the process proceeds to step 5.

[Step 5] From the contents of register RGEv.

The contents of the shutter information register RGTv, which stores the information set by operating the dial 5, are subtracted, and the result (aperture information Ay) is stored in the aperture information register RGAv.
to be memorized. It is assumed that the contents of all registers in the microcomputer COM are held while the battery BAT is loaded. Further, when the battery BAT is loaded for the first time, it is assumed that a frequently used value, for example, information such as 1/125 seconds is initially set.

[Step 6] The contents of the register RGBH storing the auto bracketing exposure step number information are stored in the aperture bracketing step number register RGBA. Also, the contents of the shutter bracket stage number register RGBT are set to zero (0).

[Step 7] Determine the state of flag FABR indicating whether auto bracketing mode is set. Assuming that auto bracketing mode is not currently set,
Proceed to step 8.

[Step 8] Determine the state of flag FMH indicating whether multiple shooting mode is set.

Assuming that the multiple shooting mode is not currently set, the process advances to step 9.

[Step 9] Auto bracket switch 5WABR
A flag FsAB indicating whether or not has been operated is reset to 0. Also, a flag FsME indicating whether the multiplex photographing switch swME has been operated is reset to O.

[Stage 7 lO] 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 calculated by the calculation is displayed on the display 5EG5, and the set shutter time is displayed on the display SEG1.

[Step 11] The second stroke of the release button l is performed, and it is determined whether the on signal of the second stroke switch sw2 is input to the input boat PAl.
Assuming that the on signal of the younger 2-stroke switch SW2 is not input, the process returns to the start. Also, while the ON signal of the first stroke switch 2 swl is being input, this routine records the subject brightness information, film sensitivity information,
Calculation information can be obtained from the setting information and this information can be displayed.

Further, if the aperture priority mode is set, the process proceeds from step 4 to step 12 to step 13.

[Step 13] Subtract the contents of the register RGAv, which stores the information set by the operation of the dial 5 and the aperture value setting switch swM, from the contents of the register RGEv, and add the result to the shutter information register RGT.
Store it in v.

Note that when the battery BAT is loaded for the first time, a frequently used value, for example, information such as F5.6 is initially set.

[Step 14] The contents of the bracket stage number register RGBH, which stores the exposure stage number information of auto bracketing, are stored in the shutter bracket stage number register RGBT. Also, the contents of the register RGBA for the number of aperture rebracketing stages are set to zero.

Thereafter, in the aperture priority mode, the same sequence as in the shutter priority mode is performed, and the aperture value set in step IO is displayed on the display 5EG5, the shutter time calculated by @ calculation is displayed on the display 5EG1, and so on. are displayed respectively.

If the manual exposure mode is set, the process goes from step 4 to step 12 to step 15.

[Step 15] Register RGTM that stores shutter time information set by operating dial 5
The contents of are written tα in the shutter information register RGTv. This is because when auto-bracketing shooting is set in manual exposure mode, the contents of register RGTv change each time a shot is taken, so the information set by operating dial 5 is stored as is. Details will be explained later. do.

After that, the same sequence as in the aperture priority mode is followed, and the aperture value set in step IO is displayed on the display 5EG5.
The set shutter time is displayed on the display 5EGI.

Next, we will describe information setting by dial operation while the photometry timer is operating. When the depression of the release button 1 (:51 stroke) is stopped during the above-described sequence, the off signal of the first stroke switch swl is input, and the program proceeds from step 1 to step 20.

[Step 201: Determine whether or not the switch lid 6 has been opened based on the state of the switch 5w5ET. Assuming that the switch lid 6 remains closed, the input port PA
Since the off signal of switch 5w5ET is input to 9,
Proceed to step 21.

[Step 211 It is determined whether the ill light timer is operating or not. Since this is immediately after the photometry timer was operated in step 2, the process advances to step 22.

[Step 22] It is determined whether the shutter priority mode is set based on the input states of the manual boats PPO and PPI. If the shutter priority mode is currently set, 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 accompanying the dial operation will be explained with reference to FIG.

"Information reading routine j [Step 80] The information input to the input ports PH0 to PH3 is stored in the dial register RGH.

At this time, the register RGH stores a numerical value corresponding to the number of clicks on the dial 5 and information as to whether the numerical value is positive or negative depending on the direction of rotation 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 the pulse signal of 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 in FIG.

[Step 24] The numerical value set by the dial operation (the contents of register RGH) and the shutter information (the contents of register R
(contents of GTv) and stored in the shutter information register RGTv again.

Also, the contents of the shutter information register RGTv are stored in register R.
Store it in GTM.

[Step 25] Determine whether or not a certain code indicating the pulp mode located next to the longest shutter speed is stored in the register RGTM.If the current valve mode is not present, proceed to NEXTl, that is, step 3 Heji Jump a.

In this way, press the release button L (first stroke)
During the photometry timer after the photometry timer is stopped, the setting information can be changed by operating the dial 5. After that, by executing the routine from step 3 onwards, the aperture and shutter settings can be changed in step 10. Second time display 5EGI
, to 5EG5.

Each can be displayed.

Further, if the aperture priority mode is set, the process proceeds to step 22 -> step 26 -> step 27.

[Step 27] Similar to step 23, here, an information reading routine associated with the operation of the dial 5 is executed.

[Step 28] The numerical value set by dial operation (contents of register RGH) and aperture value information (contents of register RG
Av contents) and register R for filtering information tp again.
Store it in GAv. Also, in aperture priority mode, NE
The aperture value and shutter time can be displayed on the displays 5EGI and 5EG5 in step IO, as in the case of the shutter time priority mode.

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

[Step 29] Determine the on/off state of the aperture value setting switch swM. In manual exposure mode, operate the aperture value setting switch swM and operate the dial to set the aperture value, and only dial operation to set the shutter. Since the configuration is such that the seconds and hours can be changed, when the switch swM is on, the process proceeds to the same routine (step 27) as in the aperture priority mode, and when it is off, the shutter priority mode is executed. The program then proceeds to execute the time and rotation routine (step 23).

When a predetermined period of time has elapsed after the suppression operation of the release button 1 was stopped, the photometry timer operation ends.

Along with this, the program moves from step 21 to step 3.
Proceed to 0.

[Step 30] Output boats PTD, PFL.

The outputs of PABR, PME, and PFD are set to "0", and all the displays on the displays 5EGI-3EG5 (however, the display 5EG2 is not present) are turned off. Further, the output of the output port PF is set to O'', the transistor TRbat is turned off, and the supply of the power supply Vcc is stopped.

[Step 31] Similar to step 9, both the flag FsAB indicating whether the auto bracketing switch swABR has been operated and the flag FsME indicating whether the multiple shooting switch SWME has been operated are reset to 0.

The program then jumps to the start.

Therefore, after the photometry timer ends, step 1 → step 2
The stun/towing mode of 0→step 21→step 30→step 31 is repeated.

Next, a description will be given of the time when the auto bracketing mode is set. First, a case will be described in which only the opening operation of the switch cover 6 is performed to set the auto bracketing mode. When the switch cover 6 is opened, the switch 5w5
ET is turned on, and this on signal is input to input port PA9. The program then proceeds from step 20 to step 40.

[Step 40] Auto bracket switch Sw
Since the switch cover 6 has just been opened and the auto bracket switch 5WABR has not been operated, the process proceeds to step 41.

[Step 411: Determine the multiplex photography switch swME. Similarly, since the multiplex photography switch swME has not been operated, the process advances to step 42.

[Step 7 42] Flag FsME is determined to indicate whether or not the suppression operation of the multiplex photography switch swME has been performed.In the initial state of battery BAT loading and when the first stroke switch swl is in the on state, flag F is set in step 9.
Since sME has been reset to O, the process advances to step 43.

[Step 43] Auto bracket switch SwAB
Similar to the case of step 42, in which the flag FsAB indicating whether the R suppression operation has been removed is determined, since the flag FsME has been reset to 0 in step 9, the process jumps to step 21.

If the switch cover 6 is opened in this way and only the ON signal of the switch 5WSET is input, nothing is executed.

Next, from the above state, remove the auto bracket switch s w
A case will be described in which the pressing operation of ABR is performed once. When the auto bracketing switch swABR is suppressed, an on signal is output to the input port PAl.
input into l. The program then proceeds from step 40 to step 44.

[Step 44] It is determined whether the contents of the register RGTM are in the valve mode. If the contents are in the valve mode, the process returns to the start and the auto bracketing mode is not entered.

If the valve mode is not set, proceed to step 45.

[Step 45] Auto bracket fee 2ch SwA
A flag FsAB indicating that BR is turned on is set to 1, and a flag FsME indicating that multiple shooting switch swME is on is reset to O.

[Step 46] Output boat PTD, PFL.

The outputs of PABR, PME, and PFD are set to "0", and all the displays on the display SEG l-5EG5 are turned off. Next, output only the output of PABR (output capo) to l'.

and the auto bracket mark on the display 5EG3 lights up. This will ensure that the auto bracketing mode is set to 1! ! The shadow person can know.

[Step 47] A flag FABR indicating that the auto bracketing 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, if the stage number information is set to 0.5 using the dial 5, for example, ro, s, o.

0.5" and if 1 is set, r-1,
Three preset auto-bracket photographs will be taken in which the exposure is automatically changed in steps of 0 and IJ. In addition, the above [-〇.

5. Shooting with a number of steps of 0, 0, or 54 means an exposure value that is -0.5 steps under the standard exposure value calculated by calculation, a standard exposure value, or 0 to the standard exposure value.
．． This means that photography is performed continuously using three exposure values, ie, five exposure values.

[Step 49] Bracket stage number register RGB
Add the contents of H and the contents of the dial, and register RG again.
Store it in BH. As mentioned above, the minimum resolution by one click of the dial 5 can be set freely in increments of 0.5 steps or in increments of 1 step. Note that if the shutter speed and the aperture value are different from each other, a program that multiplies the contents of the register RGBH by an integer may be inserted, and a detailed explanation will be omitted here since this is not related to the actual situation. Further, the contents of the register RGBH are outputted from the output port PFD, and numerical values indicating the number of stages, such as ro and 5J, are displayed on the 1 display 5EG5. The decoder FD and display 5EG5 used at this time are also used to display the aperture, and the aperture value is decoded from the apex value Ay to the F number number, and the auto bracket is decoded from, for example, 0.5. Since it is a numerical value for each stage, it is necessary to change the decoded contents,
For example, if the output from the output boat PFD is 5 bits, 32 types of data can be sent, so if the aperture value display is Fl, 4 to F32, every 0.5 stop, there are 14 types in total, and auto bracketing. If the display is from 0 to 5 in 0.5 step increments, there are 11 types in total, 30 types in total, and 31 types including the blank code.
D can determine which information it is, and the appropriate number 1 will be displayed.

[Step 50] A flag FMH indicating whether the multiple photography mode is set is determined. If the multiple photography mode is not set, the process returns to the start. If the mode is multiple shooting mode, the process advances to step 51.

[Step 51] Set the contents of the register RGME for the number of multiple shots to "3". This is because the number of auto bracket shots is predetermined to be three, so even if the number of times for multiple shots is set arbitrarily, it is mandatory. The program returns to the start in order to prevent the photographer from making operational mistakes and to eliminate the risk of erroneous exposure. Furthermore, once the on signal of the switch 5WABR is input, the flag FsAB is set to 1 in step 45, so even if the swABR off signal is input, the program continues from step 40 → step 41 → step 42. →Step 4
3→Step 48, the auto-bracketing step number change mode using the dial 5 can be maintained, and the photographer can operate the dial 5 while stopping the suppression operation of the switch swABR.

The auto bracket stage number changing mode can be canceled by turning on the first stroke switch swl, or by closing the switch lid 6 and turning off the switch 5w5ET. In other words, when the ON signal of the first stroke switch swl is input, the program progresses in the order of step 1 → step 2 → step 3 →..., and the flag FsAB is reset to O in step 9, and its display is also In step IO, the normal display is first displayed. Also switch 5w5ET
When the off signal is input, step 20 → step 2
In the process of the program proceeding from step 1 to step 30 to step 31, the auto bracket mark display disappears at step 30, and the step 31 flag FsAB is reset, so that the program does not proceed to the auto bracket stage number change mode again.

Next, exposure calculation in auto bracketing mode will be explained. In the case of shutter priority mode, the contents of the bracket stage number register RGBH are stored in the aperture bracket stage number register RGBA as described in step 6, and in the case of shutter priority mode and manual exposure mode, the contents of the bracket stage number register RGBH are stored in step 1.
As mentioned in 4, the shutter bracket stage number register RG
To BT.

I remember each one. In step 7, since the auto bracketing mode is set and the flag FABR is set to 1, the process advances to step 52.

[Step 52] Bracket stage number register RGBH
Determine whether the content of
Since multiple shots are taken, it is meaningless, so it is necessary to prohibit auto bracket shooting. Therefore, in this case, the process advances to step 53.

[Step 53] The flag FABRIO indicating auto bracketing mode is reset. Also output boat PAB
Set the R output to “0” and turn off the auto bracket mark display.

Next, by proceeding to step 8, the auto-bracketing exposure calculation is not performed, the flag FsAB is reset to O, and the normal routine is executed.

In step 52, if the contents of the bracket stage number register RGBH are not zero.

Since it is necessary to perform exposure calculation and display of the auto bracket mark using the step number information, the process advances to step 54.

[Step 54] Set the output of the output boat PABR to “1”
and display the auto bracket mark. This is because when the switch 5w5ET is turned off by closing the switch cover 6 from the auto bracket mode setting state, all the displays are turned off in step 30, so if the first stroke switch swl is turned on, it is necessary to turn it on again. This is because there is.

[Step 55] It is determined whether or not the first stroke switch SW1 is turned on. If it is turned on, the process proceeds to step 56.

[Step 56] The contents of the aperture information register RGAv and the contents of the aperture bracket stage number register RGBA are added and stored in the register RGAv again. Also, the contents of the shutter information register RGTv and the contents of the shutter bracket stage number register RGBT are added, and the register RG is added again.
Store it on TV. 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 in accordance with the number of auto bracket stages. In other words, if the autobracketing step number is set so as not to be a negative number at step 49, the value after the calculation at step 56 will be an exposure value on the under side of the standard exposure value. In addition, in manual exposure mode, the same step 14 as in aperture priority mode is passed, so the shutter speed is changed, and the aperture value is not changed as in conventional cameras, so only exposure with a constant depth of field is used. Switchable auto bracketing is now available.

Further, in step 55, the first stroke switch sw
If it is determined that l is off, the exposure calculation in step 56 is not performed because the photometry timer is operating.
The standard exposure value will be displayed in step IO.

Even in this case, when taking a picture, the first stroke of the release button L is always made, so step 56 is always passed.
Therefore, there is no problem with auto bracketing photography.

In this way, in auto bracketing mode, if the first stroke switch swl is turned on, the exposure value with auto bracketing applied, that is, the underexposure value in this example, is displayed, and the metering timer is activated. The standard exposure value will be displayed inside. This allows the photographer to easily recognize the exposure value of auto bracketing.

Next, a case will be described in which the valve mode is set by operating the dial 5 after the auto bracket mode is set.

Bracketing during bulb photography is basically meaningless, so it is more effective to cancel auto bracketing mode. Therefore, if it is determined in step 25 that the mode is the valve mode, the process advances to step 57.

[Step 57] Set the output of output port PABR to °O”
to turn off the auto bracket mark display. Also, reset the auto bracket mode flag FABR to O.

Next, a description will be given of when the multiple shooting mode is set.

The switch swM is activated in conjunction with the opening of the switch lid 6.
When the ON signal of E is input manually, the process proceeds from step 41 to step 60.

[Step 601 A flag FsME indicating that the multi-mW shadow switch swME is turned on is set to 1. Also, a flag FsAB indicating that the auto bracket switch swABR is turned on is reset to O.

[Step 611 Output port PTD, PFL.

Set the outputs of PABR, PME, and PFD to "θ'' and turn off all displays. Set the output of only output port PME to "l" and set the multiple shooting mode mark to display 5EG.
4.

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

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

[Step 64] Since the mode is auto bracketing, the number of multiple shots is forcibly set to three, as in step 51, that is, the contents of the register ROMH for the number of multiple shots are set to "
3".

If the auto bracketing mode is not set in step 63, the process advances to step 65.

[Step 65] Similar to step 48 and the like, an information reading routine associated with dial operation is executed.

[Step 66] Add the contents of the multiplexing number register RGMH and the contents of the dial register RGH, and store the result in the register ROMH again. Since the number of times of multiplexing is an integer, if the resolution of one click of the dial 5 is 0.5 stages, the contents of the dial register RGH are doubled and then added. It is also necessary to prevent the contents of the register RGI from becoming a negative number, but this is omitted here.

[Step 67] The contents of the multi-sheet concave register RIMH are output from the output port PFD and displayed on the display 5EH5.

The program then returns to the start. Furthermore, once the ON signal of the switch swME is input, the flag FsME is set to 1 in step 60, so even if the OFF signal of the switch swME is input thereafter, the flag FsME is set to 1 in step 60.
1→Step 42→Step 63, and it becomes possible to maintain the multiple shooting number setting mode. The flow in Figure 7 shows that to shift from the auto bracketing step number change mode to the multiplex shooting setting mode, you only need to turn on the switch swME once, and to switch vice versa, you only need to turn on the switch swABR once. It is also clear from

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

[Step 68] If the contents of the register ROMH for the number of multiple shots is zero, the process advances to step 69.

[Step 69] Flag FME indicating multiple shooting mode
Reset to 0. Also, set the PME output to “O”.
” to turn off the multiplex shooting mark display.

If the contents of the register RGMH for the number of times of multiple photographing are not zero in step 68, the process proceeds to step 70.

[Step 70] Set the output of the output port PMH to 1'' and display the multiple shooting mark. This will turn off all the displays in step 30, so when the first stroke of the release button L is made again, it will be in the multiple shooting mode. This is to let the photographer know.

The preparation stage for photographing is completed as described in 1 above.

Next, the sequence after the second stroke of the release button I 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 PAl, the process proceeds from step 11 in FIG. 7 to step 100 in FIG. 9.

[Step 1 oll Determine whether auto bracket mode is set or not based on the state of flag FABR. If the auto bracket mode is selected, the process proceeds to step 101; otherwise, the process proceeds to step IO2.

[Step lot] Set the output of PFL to “1”
°' and the auto bracket mark on the display 5EG2 is displayed blinking. This allows the photographer to reliably know that auto bracket photography has started.

[Stella 7'102] Determine whether or not the ON signal of the self-switch 5ELF is manually input to the input boat PA6. If the ON signal is input, it means that the self-timer is used for photography, so go to step 103. Otherwise, proceed to step 103. If so, proceed to step 104.

[Step 2 103] The self-timer measures 10 seconds.

[Step 104] The contents of the aperture information register RGAv are output from the output port (PAY). As a result, the aperture control drive circuit DAV converts the contents of the register RGAv into actual aperture information.

Actuator CA for aperture drive such as stepping motor
Aperture control is started via M.

[Step 105] A pulse signal is output from the output boat PEO, and the transistor TRO is turned on to energize the mirror-up magnet MGO, which is the first fixed combination magnet.

As a result, the mirror is raised by a known spring force.

[Step 106] It is determined whether or not the on signal of the switch swMRUP, which detects the completion of mirror up, is input to the input boat PA2.Here, it is determined whether the on signal is input to the input boat PA2, that is, until the mirror is completely raised. This loop is repeated until the image is completely uploaded, and the process proceeds to step 107.

[Step 107] Shutter information register RGT
Since the contents of v are apex values, they are converted (expanded) into real-time data.

[Step 108] A pulse signal is output from the output boat PEl, and the transistor TRI is turned on to energize the shutter front curtain magnet MGl. This causes the shutter front curtain to run.

[Step 109] It is determined whether the contents of the register RGTM indicate the valve mode.

If the valve mode is set, the process proceeds to step 110; otherwise, the process proceeds to step 111.

[Step 110] Second stroke switch SW2
Since this is the valve mode, it is necessary to keep the shutter open while the on signal of the second stroke switch sw2 is manually input.

[Step till] Since it is not the valve mode, a real time count is performed using the expanded data in step 107, and the calculated shutter time is measured.

[Step 112] When the real time count ends,
A pulse signal is output from the output capo-1-PE2, and the transistor TR2 is turned on to connect the shutter rear curtain magnet MG.
2 is energized. This causes the shutter trailing curtain to run.

[Step 1131 Determine whether or not the ON signal of the shutter rear curtain switch 5wCN2 is input to the human-powered boat PA5.Here, this step is performed until the ON signal is input, that is, until the shutter rear curtain switch 5wCN2 completes running. The loop is repeated, and upon completion, the process proceeds to step 114.

[Step 114] Set the output of the output boat PA■ to °゛O
”, the aperture returns to its open state.

[Step 115] Set the output of the output boat FD to “1”
Then, the transistor TR3 is turned on to rotate the charge motor MD for mirror down and shutter charging.

[Step 116] It is determined based on the state of the flag FMH whether the multiple photography mode is set. If the multiple photography mode is set, the process advances to step 117; otherwise, the process advances to step 120.

[Step 117] Subtract l from the contents of the multiplex count register RGME and store it in the register RGMH again.

[Step 118] It is determined whether the contents of the multiplexing number register RGME are zero. If the contents are zero, the process proceeds to step 119; if not, the process proceeds to step 121.

[Step 119] The content of the multiplexing number register RGME is O, which means that multiplexing has been completed. 1! Set the flag FME indicating the shooting mode to 0.
Reset to . Also, change the output of the output boat PME to °“O°
' to turn off the multiplex shooting mark display.

[Step 120] Start a timer for film feeding. Also, set the output of the output boat PB to “1”,
The transistor TR5 is turned on to rotate the film feeding motor MB.

If the multiple shooting mode is continued, the contents of the multiplex number register ROM, H are not zero, so step 118 is executed.
The process then proceeds to step 121, and since step 120 is not passed, film feeding is not performed, so multiple photography is performed. Further, when the multiple shooting is completed, the contents of the register ROMH become zero, so the film is fed in step 120 after canceling the multiple shooting mode as described above.

[Step 121] Determine whether or not the ON signal of the charging completion detection switch swCGH is manually applied to the human-powered boat PA3.The ON signal is not manually applied.
In other words, if charging is not completed, the process proceeds to step 123, and if charging is completed, the process proceeds to step 122.

[Step 122] Since charging is completed, the output of the output boat FD is set to "O'" and the charging motor MD is turned on.
Cut off the power to.

[Step 123] Input boat P/! 4 to film l
It is determined whether an on signal is input to the switch swFLM, which is turned on every time frame feeding is completed. If the ON signal is not manually input, that is, if the feeding of one frame of film is not completed, the process proceeds to step 124, and when the feeding is completed, the process proceeds to step 125.

[Step 1241: Determine the state of the film feeding timer. When the film is finished, no further film feeding is possible, so the switch swFLM is never turned on, and in such a case, the timer for film feeding, which is, for example, a one-second timer, finishes counting. When the time measurement is completed, proceed to step 150, otherwise proceed to step 1
21 and repeats the aforementioned sequence (step 121→step 123).

[Step 125] In step 123, switch s w
When it is detected that the FLM off signal is input, the output of the output capacitor (PB) is set to "O°", and the transistor TR5 is turned off.
is turned off to stop the film feeding motor MB.

[Step 126] It is determined whether the auto bracket mode is set or not based on the state of the 7-lag FABR. If it is not the auto bracketing mode, the process proceeds to step 132; if so, the process proceeds to step 127.

[Step 127] Determine whether or not auto bracket shooting has been performed three times.As mentioned above, auto bracket shooting is shooting that is performed continuously at three levels of exposure: under, standard, and over. If the three shots have not been completed, the process advances to step 128.

[Step 128] The contents of the aperture bracket step register GRBA are subtracted from the contents of the aperture information register RGAV, and the result is stored in the register RGAV again.

Also, the contents of the shutter bracket stage number register GRBT are subtracted from the contents of the shutter time information register RGTv, and the result is stored in the register RGTv again. Here the seventh
Similar to step 56 in the figure, the same program can be used for shutter priority, aperture priority, and manual exposure modes.
This is because the contents of T have been changed. It is because of this arithmetic expression (subtraction formula) that the exposure will be standard in the 2nd shot, and the exposure will be overexposed in the 3rd shot.

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

The program then jumps to NEXT2, step IO4. In other words, regardless of whether or not the second stroke switch SW2 is on or off (regardless of whether a release signal is generated or not), the next photographing starts. Furthermore, even if the shooting at this time is in the self-mode, the self-timer is not executed for the second and third times and the next shooting starts.

[Step 130] First stroke switch SW2
It is determined whether the off signal is inputted or not. If the off signal is not inputted at this time, step 128
．． The display calculated in step 129 can be viewed. In other words, the final overexposure value can be confirmed at this time. Therefore, by seeing the underexposure value of 11 once in the discrimination display in step 55, all exposure displays of the underexposure value, standard A1, and overexposure value during auto bracketing shooting can be confirmed in the shooting sequence. It becomes possible to do so. 1st stroke switch sw
When the second off signal is input, the process advances to step 131.

[Step 1311: Reset the flag FABRQO indicating auto bracketing mode. Matade Capo) PF
Set the L output to “0” and turn off the flashing auto bracket mark.

The program then returns to start and enters standby mode.

Next, a case where the auto bracket mode is not set will be described. In this case, since the flag FABR is O, the process advances from step 126 to step 132.

[Step 132] It is determined whether the mode is quick shooting mode or single shooting mode based on the on/off state of switch 5wC5 input to PA7 (input capo).If it is continuous shooting mode, return to the start, and in this case release button l is pressed. The first pressing operation is performed. Since the ON signal of the second stroke switch swl, 2 is input, the next iM shadow is entered. In the case of single shooting mode, the process advances to step 133.

[Step 133] Wait for the OFF signal of the first stroke switch SW2 to be input manually. Since this is a single shooting mode, the next shooting sequence will not proceed unless the suppression operation of the tel camera groove release button L is stopped. When the off signal is input, the process returns to the start.

Next, we will discuss the case where the film ends during shooting. In this case, as mentioned above, the time measurement by the film timer, which is a one-second timer, for example, ends, so step 12
4, proceed to step 150.

[Step 150] Set the output of the output port PC to "1"
” and turns on the transistor TR5 to rotate the rewind motor MC. As a result, rewinding of the film is started.

[Step 1511 Start a rewind timer used to detect whether rewinding of the film has finished.

[Step 152] It is determined whether the state of the film switch swFLM has changed. If it has changed, the process returns to step 151 and the rewind timer is started again. If there is no change, the process advances to step 153.

[Step 153] It is determined whether or not the time measurement by the rewind timer has ended. If it has not ended, the process returns to step 152.

As can be seen from the above, between the feeding of 1 frame and 1 frame, step 152. The process proceeds through the loop of step 153, and when the completion of feeding of one frame is detected, the process proceeds from step 152 to step 151, and this loop is repeated when the film is rewound. After that, when all the films are wound up in the cartridge, for example, the cartridge stops rotating and the state of the film switch swFLM no longer changes. If this is detected, the process proceeds to step 154.

[Step 154] Set the output of the output port Pc to "o"
", the transistor TR5 is turned off, and the winding motor MC is stopped. This completes the rewinding of the film.

[Step 155] The flag FABRIO indicating auto bracketing mode is reset. Matade Capo) PF
Set the L output to “O” and turn off the flashing auto bracket mark.

The program then returns to the start.

Also, during auto bracket shooting, in other words,
If you have to take multiple shots in a row but the film ends midway through, repeat step 1 at the 1st or 2nd frame.
In such a case, continuing auto-bracketing on the newly loaded film may cause the subject to be different or the photographer may misunderstand the use of the film. It is desirable to inform the photographer of this, and at the same time cancel the auto bracketing mode. Looking at this in the flowchart of Figure 9, when the film ends after the auto bracketing mark is displayed blinking in step 101, it is desirable to cancel the auto bracketing mode. automatically moves to film rewind. While this film rewinding is being executed, the flashing display of the auto bracket mark has not yet been canceled. Therefore, the auto bracketing mark, which would not normally be displayed, is displayed during film rewinding, allowing auto bracketing shooting! This allows the photographer to know that the film has ended without the shadow completely ending. In other words, this is the warning display. Also, step 155
Since the flag FABR indicating auto bracketing mode is reset to O at , there is no inconvenience that auto bracketing continues on newly loaded film as in conventional cameras.

According to this embodiment, when auto-bracketing shooting in manual exposure mode, auto-bracketing shooting is executed using exposure control information obtained by automatically changing manually set shutter time information (step 15 → Step 14), since the aperture was changed as in the past, the depth of field was different, and each frame had a different image. Taking photos constitutes maizō.

(Effects of the Invention) As described above, according to the present invention, when the exposure mode is set to the manual exposure mode, an information variable means is provided for changing manually set shutter time information every time a photograph is taken. Therefore, in manual exposure mode, auto-bracketing is executed using the manually set shutter speed information and the manually set aperture value, which is changed for each shot. Even in auto bracket shooting, it is possible to perform the original photography of auto bracket shooting.

[Brief explanation 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 disposed in a camera incorporating the embodiment shown in FIG. 4 is a front view of the camera, FIG. 5 is a top view, FIG. 6 is a back view, and FIGS. 7 to 9 are flowcharts. l...Release button, 2, 3...Operation lever, 4...Exposure mode selection knob, 5...
...Dial, 6...Switch cover, 7...
...Storage section, swABR...Auto bracket switch, swME...Multiple shooting switch,
COM・・・Microcomputer, TD, AD
, FD...decoder, 5EGI~5EG5...
... Display device, DIF ... Dial interface circuit, MB, MC, MD ... Motor, 101 ... Information variable means, 105 ...
-Level change amount storage means, 106... Auto bracket photography control means, 107... Exposure value storage means, lO8... Photography number determination means.

Claims (1)

[Claims] (1) In a camera exposure control device equipped with an auto-bracketing control means that automatically changes the exposure value and performs multiple shots, when the exposure mode is set to manual exposure mode, the manual setting 1. An exposure control device for a camera, comprising an information variable means for changing shutter time information for each photograph.