JPS6337325A - Exposure control device for camera - Google Patents

Abstract

PURPOSE:To prevent wrong auto bracket photographing from being executed, and also, to execute auto bracket photographing again by simple operation, by providing a level variation quantity storage means for storing the information which is set by a level variation quantity setting means, until the next level variation quantity is set, and a detecting means. CONSTITUTION:When a variation quantity of an exposure level, namely, stage number information for varying the exposure level at the time of auto bracket photographing is set by a level variation quantity setting means 105, an exposure level changing operation is executed again by the level variation quantity setting means 105, and a level variation quantity storage means 106 stores its information until new stage number information is inputted. Thereafter, when a release operation of a release operating means 107 is executed by a photographer, an auto bracket photographing control means 103 controls a diaphragm mechanism or a shutter mechanism, etc., based on an auto bracket exposure value from the level variation quantity storage means 106, and starts the auto bracket photographing. A detecting means 109 detects whether the auto bracket photographing frequency has reached a prescribed frequency or not.

Description

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

Note that the auto bracketing (more precisely called auto exposure bracketing) refers to the camera's exposure value (in the case of automatic exposure, the exposure control value is automatically calculated from the subject brightness and film sensitivity, and in the case of manual exposure, This refers to the offset of the camera with respect 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) In conventional cameras, even after the exposure value has been automatically changed and the set number of film frames have been shot, the mode is maintained unless the auto bracketing mode is canceled. However, in order to reduce the number of camera operation switches as much as possible, the auto bracketing mode setting etc. is also used as a switch for other information settings. ,
As a result, the applicant of the present application has the disadvantage that complicated operations are required not only for setting but also for canceling, which may lead to operational errors.

When auto bracketing shooting is finished, auto bracketing mode is automatically canceled to prevent erroneous shooting or
On the same day, a proposal was filed to prevent operational errors.

By the way, when realizing the proposed camera as described above, the auto bracket mode is automatically canceled at the same time as the auto bracket shooting is completed.

It is conceivable to create a configuration that also cancels various information necessary for auto bracket shooting (information such as the amount of change in exposure level), but if auto bracket shooting is performed not only once but rather frequently, It is extremely troublesome to set each piece of information necessary for the system, and there is a risk that it takes time and may lead to operational errors. Further, since photographers often use the same type of film, there is a high probability that information such as the setting of the amount of change in exposure level will be used as is, and it is desirable to retain this information.

(Object of the Invention) An object of the present invention is to provide a camera that solves the above-mentioned problems, prevents erroneous auto-bracketing from being performed, and enables auto-bracketing to be performed again with a simple operation. An object of the present invention is to provide an exposure control device.

(Features of the Invention) In order to achieve the above object, the present invention provides a level change amount storage means for storing information set by a level change amount setting means until the next level change amount setting, and a counter means that stores information set by the level change amount setting means. a detection means that detects that a predetermined number of times has been reached and releases the auto bracketing mode memory of the mode storage means in response to the detection, so that when auto bracket shooting is finished, auto bracketing is automatically performed. A feature of this feature is that when auto bracketing is shot when auto bracketing mode is reset without canceling the level change amount information after canceling the mode, the previous level change amount information that has been memorized is used. shall be.

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

When the auto bracketing mode is set by the auto bracketing mode setting means 101 when the first stroke operation of the release button is not performed, the mode storage means 10
2 stores the auto-bracketing mode and transmits it to the auto-bracketing photography control means 103.

At this time.

A mark indicating that the auto bracketing mode is set is displayed on the display means 104. Further, when the amount of change in the exposure level is set by the level change amount setting means 105, that is, the step number information for changing the exposure level during auto bracket shooting, the level change amount storage means 106 stores rlf and the level change amount setting means 105. The exposure level changing operation is performed and the information is stored until new step number information is entered manually.

After that, when the photographer performs a release operation of the release operation means 107, the auto bracket i shadow control means 10
3 controls the diaphragm configuration, shutter mechanism, etc. based on the auto-bracketing exposure value stored in the level change amount storage means lO6, and starts auto-bracketing photography. When the first auto-bracket photographing is completed, the various mechanisms described above are charged, and then it is determined whether the auto-bracket mode is set. Since the auto-bracketing mode is set here, the auto-bracketing shooting control means 105 controls the number of shots counter 10.
Continuous photography is continued while automatically changing the exposure value until a detection means 109 detects that the number of auto-bracket photography counted at 8 has reached a predetermined number. As can be seen from the above, the detection means 108 detects whether or not the number of times of auto-bracketing has reached a predetermined number of times, and upon detecting that the number of times of auto-bracketing has been reached, the process goes to the auto-bracketing control means 103 of ri77. It outputs a stop signal and also outputs a release signal to the mode storage means 102. As a result, auto-bracket photography ends and auto-bracket mode is canceled. At this time, the storage in the level change amount storage means 106 is not cleared. Furthermore, by canceling the auto bracket mode, the display of the auto bracket mode on the display means 103 is prohibited.

In the embodiment shown in FIG. 1, a single release operation causes auto-bracketing to be performed a predetermined number of times in succession, and a stop signal is output when the number of windfalls is detected to stop auto-bracketing. However, the configuration may be such that the exposure value is changed every time a release operation is performed, and auto-bracket photography is executed.

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 seen from above. Figure 6 shows the arrangement of each operating member when viewed from the back side.
In Figures 6 to 6, l is the release button, 2 is the operating lever for selecting either quick shot (C) or close shot (S) shooting mode, 3 is the operating lever for selecting the self-timer, and 4 is the shutter. The exposure mode selection knob selects the exposure mode of priority (Tv), aperture priority (Ay), or manual (M). For example, the so-called electronic dial is equipped with 2-bit conductive patterns and brushes that are 90 degrees out of phase with each other, and is used to set the information for every 5 steps or 1 step. swM is the switch for setting the aperture value. In the manual exposure mode, the aperture value can be changed by pressing the switch swM and operating the dial 5. 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 the reflected light from the object, and outputs the received light signal to the operational amplifier OPi, which has a high impedance circuit connected to the compression diode D1 in the feedback circuit.The operational amplifier OPI receives the logarithmically compressed object brightness. Information By is output via resistor R1. Variable resistor VR1 connected to constant voltage source vGl outputs film sensitivity information Sv.

The operational amplifier OP2 with the resistor R2 connected to the feedback circuit is
The photometric information Ev=(Bv+Sv) is calculated and output.

The photometric information Ev is converted into a 4-bit digital value by the A/D controller 8, and then sent to the microcomputer C.
It is input to the input port PGO-PG3 of OM.

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 pulse-responsive 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 microcombi
User COM and display system decoder TD.

AD, FDt and dial interface circuit DI
A power supply Vbat is supplied to F and the like. Also, the release button 1
When the first stroke switch Swl connected to the input port PAO is turned on by the first stroke, the potential of the output port PF becomes high level, so the transistor TRbat is turned on by the inverter INV and the resistor R3.

The voltage from the power supply Vbat is supplied as the power supply Vcc to circuits such as photometric operational amplifiers OPI and OF2 that consume a relatively large proportion.

Microcomputer COM input ports PA1-11
The second stroke switch SW2 is turned on by the second stroke of the release button L, and turned off by raising the mirror.
Mirror up switch sw that turns on when the mirror is down,
MRUP, 4! A charging completion detection switch swCGE is turned on when mechanical charging is completed, a film switch swFLM is turned on each time the feeding of one frame of film is completed, and a trailing curtain switch 5wCN2 is turned on when the trailing curtain has completed running. A self-switch 5w that is turned on when the self-timer is set by the operating lever 3
5ELF, the W switch 5wC5, the aperture value setting switch swM, and the switch lid 6 that are turned on when the continuous shooting mode is selected by the operation lever 5 and turned off when the single shooting mode is selected. Switch 5w5E turns off when opened and turns on when opened.
T, 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 tJ constant magnet) MG.
(O, leading curtain magnet that runs the leading curtain) MC1, and the trailing curtain magnet MG2 that runs the trailing curtain, are controlled to be energized, respectively. Also, resistor R13 is installed on the output boats PD, PC, and FB.
The bases of transistors TR3-5 are connected to Jn through ~15.
The transistor TR3 controls the drive of the charging motor MD, the transistor TR4 controls the drive of the rewind motor MC, and the transistor TR5 controls the drive of the winding motor MD which winds the film at high speed.

From the output port PTD, the contents of the shutter time information register RGTv in the microcomputer 00M are output to the decoder TD, and the decoder TD converts the contents into a signal for displaying the shirt time and time, and the decoder TD converts the contents into a signal for displaying the shirt time and time. The signal is output to the displayed display 5EGl.

Output ports PFL and PABR output "l" (meaning high level) or "θ" (meaning low level) signals to decoder AD, and decoder AD receives an "l" signal from output port PFL. If it is input, a signal for displaying the auto bracketing mark blinking is output to the connected display device 5EG2 made up of a liquid crystal or the like. Output Capo) When a "l" signal is input from the PABR, a signal for displaying the top bracket mark is output to the display 5EG2.

Output capo) From the PME, a signal of "l" or "O'' is output to the display device 'SEG4' which is composed of a liquid crystal etc., and when the signal of "l" is input to the display device 5EG4, , displays the multiple shooting mark.

Output capo) From the PFD, the microcomputer 00M
The contents of the aperture value information register RGAv, the contents of the auto bracketing step information register RGBR, or the contents of the multiplex number information register ROMH are stored in the decoder FD.
Output to. The decoder FD outputs a signal for displaying numerical values corresponding to each of the contents in item 1ii to the connected display device 5EG5 formed of a liquid crystal or the like.

From the output port PAY, the contents of the aperture value information register RGAv in the microcomputer 00M are output to the aperture control drive circuit DAY. The aperture control drive circuit DAV is connected to the drive actuator CAV.
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 input PAO, the process proceeds to step 2.

[Step 2] Output a “1” signal from the output port PF, turn on the transistor TRbat, and turn on the power supply Vcc.
Then, the photometry timer is started. The photometry timer is used to continuously supply power Vcc for a predetermined period of time from the input of the off signal to the first stroke switch swl, which allows the photographer to press the release button.
Even if you take your hand off, you can check the photometry status for a predetermined period of time, and you can use the exposure mode selection knob 4 to change setting information while looking at the display. Note that this configuration can be easily performed using a hardware timer built into 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 RGEv.

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

[Step 5] Subtract the contents of the shutter information register RGTv, which stores information set by operating the dial 5, from the contents of the register RGEv, and record the result (aperture information Av) in the aperture information register RGAv. t
α. It is assumed that the contents of all registers in the microcomputer 00M 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 that stores 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 multiple shooting mode is not currently set.

Proceed 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 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 calculated by the calculation is displayed on the display 5EG5, and the set shutter speed 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 manually applied 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 first stroke switch swl (on signal -) is turned on manually, 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 goes from step 4 to step 2 to step 13.

[Step 13] 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, are subtracted from the contents of the register RGEv, and the result is added to the shutter information register RGTv.
to be memorized.

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 auto bracket advance stage number information, 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 1O is displayed on the display 5EG5, and the shutter speed calculated by the calculation is displayed on the display 5EGl, respectively. Is displayed.

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

[Step 15] The contents of the register RGTM storing the shutter speed information set by operating the dial 5 are stored 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 10 is displayed on the display 5EG5.
The set shirt 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 (first stroke) of the release button 1 is stopped during the above-described sequence, the off signal of the first stroke switch swl is manually input, and the program proceeds from step 1 to step 20.

[Step 201: Determine whether or not the opening operation of the lower switch 6 has been performed based on the state of the switch 5w5ET. Assuming switch 46 remains closed, the input capo) PA
Since the off signal of switch 5w5ET is input manually at 9,
Proceed to step 21.

[Step 21] It is determined whether or not the 11-light timer is in operation. Since this is immediately after the photometry timer has been 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 input ports PPO and PPI. If the shutter priority mode is currently set, the process advances 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" [Step 80] The information input to the input ports PH0-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 811 Output the pulse signal of the output boat PE3. As a result, the value of the dial interface circuit DIF is reset to O.

[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 +M degree shutter information register RGTv.

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 valve mode located next to the longest second of the shutter speed is stored in the register RGTM.If the current mode is not the help mode, go to NEXTl, that is, step 3
Hejyump.

During the photometry timer after the suppression (first stroke) of the release button L is stopped in this way, the setting information can be changed by operating the dial 5, and then the routine from step 3 described above is executed. In step 10, the aperture value and shutter speed are displayed on the displays 5EGI and 5.
Each can be displayed on the EG5.

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 RG for aperture information again.
Store it in Av. Also, in aperture priority mode, NEX
The program jumps to TI, that is, step 3, and the aperture value and shutter speed can be displayed on the displays 5EG1, 5EG5, respectively, in step IO, as in the shutter speed priority mode.

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

[Step 29] It is determined whether the aperture value setting switch swM is on or off. In manual exposure mode, the aperture value can be changed by operating the aperture value setting switch swM and dial operation, and the shutter speed can be changed by operating only the dial. 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 process proceeds to the same routine (step 23) as in the shutter priority mode.

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 ports PTD, PFL.

The outputs of PABR, PME, and PFD are set to "0", and all displays on the displays SEG1 to 5EG5 (however, the display 5EG2 does not exist) are turned off. Further, the output of the output port PF is set to "0", 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 O.

The program then jumps to the start.

Therefore, after the photometry timer ends, step 1→step 2
The standby 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 manually to input port PA9. The program then proceeds from step 20 to step 40.

[Step 40] Auto bracket switch SwAB
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 41] The multiplex photography switch swME is determined. Similarly, since the multiplex photography switch swME has not been operated, the process advances to step 42.

[Step 42] In the initial state of loading the battery BAT and the ON state of the first stroke switch swl, flag FsME is determined in step 9 to determine whether or not the suppression operation of the multiple shooting switch swME has been performed. has been reset to 0, so step 4
Proceed to step 3.

[Step 43] Auto bracket switch SwAB
As in the case of step 42, in which flag FsAB indicating whether or not the R pressing operation has been performed, flag FsME has been reset to O in step 9, so 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, auto bracket switch swAB
A case where the R suppression operation is performed once will be described. When the auto bracketing switch SwABR is suppressed, an on signal is input to the input capo (PAIL). 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 switch SwAB
A flag FsAB indicating that R is turned on is set to 1, and a flag FsME indicating that the multiplex shooting switch swME is on is reset to 0.

[Step 46] Output port PTD, PFL.

Set the outputs of PABR, PME, and PFD to "0" and turn off all the displays on display 5EGI-3EG5. Next, set only the output of output port PABR to 1", and turn off the display on display 5EGI-3EG5.
Turn on the auto bracket mark 3. This allows the photographer to clearly know that the auto bracketing mode has been set.

[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, if stage number information of 1, for example 0.5, is set by dial 5 in step 80, then r-o, s, o.

0.5" and if l 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.

Shooting with 5, 0, 0, and 54 steps means underexposure by -0.5 steps compared to the standard exposure value calculated by calculation, standard exposure value, and standard exposure value. This means that images are taken continuously at three levels of exposure, including an overexposure value of 0.5 steps.

[Step 49] Placket 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 resolution is different from the shutter speed and the aperture value, 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 it is not related to the actual situation. Further, the contents of the register RGBH are output from the output port PFD, and the display 5EG5 displays a numerical value indicating the number of stages, for example rO, 5J. 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, but if the output from the output port PFD is, for example, 5 bits, 32 types of data can be sent, so the aperture value display is Fl, If every 0.5 steps from 4 to F32, the total is 1
4 types, if the auto bracket display is O to 5 and every 0.5 step, there are 11 types in total, 30 types in total, 31 types when blank code is included, output capo) Constant when sending data to PFD Decoder FD by adding
It is possible to determine which information it is, and the appropriate numerical display is Machizu Shichi.

[Step 50] A flag FMH indicating whether the multiple shooting mode is set is determined. If the multiple i1ftM shadow mode is not set, the process returns to the start. If the multiple shooting mode is selected, 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, it is possible to continue to maintain the auto-bracketing step number change mode with the dial 5, and the photographer can operate the dial 5 with the suppressing operation of the switch swABR stopped.

The auto bracket stage number changing mode can be canceled by turning on the first stroke switch swl, or by closing the switch 46 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 0 in step 9, and its display is also In step IO, the display switches to normal display. 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 14.
As mentioned above, the shutter bracket stage number register RGB
To T.

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 RGBR
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] A flag FABR indicating auto bracketing mode is reset to 0. Also output port PABR
Set the output to “O” 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 0, and a 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 output port PABR to °“1.
", and the auto bracket mark is displayed. This means that when the switch cover 6 is closed from the auto bracket mode setting state and the switch 5w5ET is turned off,
This is because 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.

[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] Add the contents of the aperture information register RGAv and the contents of the aperture bracket stage number register RGBA, and write it in the register RGAv again! ! let Also, the contents of the shutter information register RGTv and the contents of the shutter bracket stage number register RGBT are added, and the result is stored in the register RGTv again. This means that the aperture information calculated in the shutter priority mode and the shutter speed information calculated in the aperture priority mode are changed in accordance with the number of autobracket stages. In other words, if you set the auto bracketing step number so that it does not become a negative number at step 49, the value after the calculation at step 56 will be the standard exposure H.
The exposure value is on the under side compared to the actual value. In addition, in manual exposure mode, since step 14, which is the same as in aperture priority mode, is passed, 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. Auto-bracketing photography that switches is the main part.

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 results in 1&
! The person in the shadow can 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 non-existent, so it is more effective to disable 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 the output boat PABR to 110
” and 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, the process proceeds from step 41 to step 60.

[Step 60] A flag FsME indicating that the multiplex photographing switch swME is turned on is set to 'l. Also, a flag FsAB indicating that the auto bracket switch swABR is turned on is reset to O.

[Step 61] Output boats PTD, PFL.

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

[Step 62] Flag F indicating multi-ffl shooting mode
Set ME to l.

[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 RGMH 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 661: Add the contents of the multiplexing number register ROMH and the contents of the dial register RGH, and store the result in the register RGMH again. Since the number of times of multiplexing is an integer, if the decomposition residue of one click on the dial 5 is 0.5 steps, the contents of the dial register RGH are doubled and then added. It is also necessary to prevent the contents of the register RGH from becoming a negative number, but this is omitted here.

[Step 67] The contents of the multi-card concave register RGMH 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 process continues from step 2 41→step 42→ Proceeding to step 63, it becomes possible to maintain the multiple shooting number setting mode. To shift from auto bracketing step number change mode to multi-use shooting setting mode, you only need to turn on switch swME once.
It is also clear from the flowchart in FIG. 7 that the reverse transition can be achieved by turning on the switch swABRt-1 times.

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 RGMH for the number of multiple shots is zero, the process advances to step 69.

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

If the contents of the register ROMH 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 output port PME to “1”
The multiple shooting mark will be displayed. This is step 3
Since all the displays are turned off at 0, when the first stroke of the release button 1 is made again, the photographer is notified that the multiple shooting mode is in effect.

The preparation stage for photographing is completed as shown in FIG.

Next, the sequence after the second stroke of the release button I will be explained. When the second stroke of the release button l is performed and the on signal (release signal) of the second stroke switch sw2 is manually applied to the human-powered boat PAl, steps 11 in FIG. 7 to step 100 in FIG.
Proceed to.

[Step 1001: Determine whether or not the auto bracket mode is set based on the state of the flag FABR. Step 101 if in auto bracket mode
If not, proceed to step 102.

[Step lO1] Set the output of the output port PFL to “1”
", and the auto bracketing mark on the display 5EG2 is displayed blinking. This allows the photographer to reliably know that auto bracketing photography has started.

[Step 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 manually, the process goes to Step 103 since the photograph is taken using a self-timer. If not, the process goes to Step 103. Proceed to step 104.

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

[Step 104] The contents of the aperture information register RGAv are output from the output port (PAV). Thereby, the aperture control drive circuit DAY converts the contents of the register RGAv into actual aperture information.

Actuator CA for aperture drive such as stepping motor
Start aperture control via V.

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

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

[Step 106] It is determined whether the on signal of the switch swMRUP, which detects the completion of mirror up, is manually applied to the human-powered boat PA2.Here, it is determined until the on signal is input, that is, 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-style, they are converted (decompressed) into real-time data.

[Step tOa] A pulse signal is output from the output port PEl, and the transistor TRI is turned on to energize the shutter front curtain magnet MCI. 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 ill.

[Step 110] Second stroke switch SW2
Since this is the valve mode, it is necessary to keep the shear 2 open while the on signal of the second stroke switch sw2 is input.

[Step 111] Since it is not the pulp mode, a real time count is performed using the data expanded 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 boat PE2.

The transistor TR2 is turned on to energize the shutter rear curtain magnet (MG2). This causes the shutter trailing curtain to run.

[Step 113] Enter Capo) 1? It is determined whether or not the ON signal of the shutter rear curtain switch 5wCN2 is manually inputted to A5. Here, this loop is repeated until the ON signal is input, that is, until the shutter rear curtain has completed running. Then, the process advances to step 114.

[Step 114] Set the output of the output boat PAV to “θ
Make it a pa. As a result, the diaphragm returns to its open state.

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

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

[Step 117] Subtract 1 from the contents of the multiplexing number register RGME and store it in the register ROMH 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] Since the content of the multiplexing number register RGME is O, it means that multiplex photography has ended, so the flag FME indicating the multiplex photography mode is reset to O. Also, set the output of PME to “0”,
Turn off the multiple shooting mark display.

[Step 1203 Start a timer for film feeding. Also, set the output of the output boat PH to “1”,
The transistor TR5 is turned on to rotate the film feeding motor MB.

If the multiple shooting mode is being continued, the contents of the multiplex number register RGMH are not zero, so the process advances from step 11B to step 121, and since step 120 is not passed, film feeding is not performed, so the multiple shooting mode is not executed. will be held. Furthermore, when the multiple shooting is completed, the contents of the register RGMH become zero, so the film is fed in step 120 after canceling the multiple shooting mode as described above.

[Step 1211] Determine whether or not the ON signal of the charging completion detection switch swCGE is input to PA3.The ON signal is not input.
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 PD is set to 0°, and the charging motor M is turned on.
Cut off the power to D.

[Step 123] It is determined whether an on signal of the switch swFLM, which is turned on every time one frame of film has been fed, is input to the input boat PA4. If the ON signal is not input, that is, if the feeding of one frame of film is not completed, the process advances to step 124, and when it is completed, the process proceeds to step 1.
Proceed to step 25.

[Step 124] 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, the process advances to step 15-0, and when the time measurement has not been completed, the process returns to step 121 and repeats the above-mentioned sequence (step 121→step 123).

[Step 125] In step 123, switch swF
When it is detected that the LM off signal has been input, the output of the output boat PR is set to "O", the transistor TR5 is turned off, and the film feeding motor MB is stopped F.

[Step 126] It is determined whether the auto bracketing mode is set or not based on the state of the flag 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] It is determined whether or not auto bracket shooting has been performed three times.As mentioned above, auto bracket shooting is under,? Since the photographing is performed continuously at three levels of exposure value, semi-exposure and over-exposure, if the three photographic operations are not completed, the process proceeds 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 RGAy again.

Also, the contents of the shutter bracket stage number register GRBT are subtracted from the contents of the shutter bracket stage information register RGTv, and the result is stored in the register RGTv again. Here the seventh
Like the stay 56 in the figure, shutter priority, aperture priority,
The same program can be used even in manual exposure mode.
In steps 6 and 14, registers RGBA, RG
This is because the contents of BT have been changed. The second shot was at standard exposure, and the third I! It is clear from this calculation formula (subtraction formula) that shadows result in overexposure.

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

The program then moves to NEXT2, step 104.
Jump. In other words, regardless of whether the second stroke switch SW2 is on or off (regardless of whether a release signal is generated or not), the first photographing starts. Furthermore, even if the shooting at this time is in the self-mode, the next shooting starts without executing the 7-luff timer for the second and third times.

[Step 130] It is determined whether the off signal of the first stroke switch SW2 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, since the first underexposure value can be seen in the discrimination display in step 55, all exposure displays of the underexposure value, standard value, and overexposure value during auto bracket shooting can be confirmed in the shooting sequence. becomes possible. When the off signal of the first stroke switch sw2 is input, the process proceeds to step 131.

[Step 1311: Reset flag FABR indicating auto bracketing mode to 0. Matade Capo) P
Set the FL 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 0, the process advances from step 126 to step 132.

[Step 132] Based on the on/off state of the switch 5wC5 manually operated on the input boat PA7, it is determined whether the mode is a quick shot mode or a single shot mode.If it is a quick shot mode, the process returns to the start, and in this case, the release button L is pressed. 1. Since the ON signal of the second stroke switch swl, 2 has been input, the next photographing begins. 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. Since this is single shooting mode, the next shooting sequence will not proceed unless the photographer stops pressing the release button L. The off signal is input. When 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 1501 Set the output of the output boat PC to “1”
Then, the transistor TR5 is turned on to rotate the wind motor MC. This starts rewinding the film.

[Step 151] 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, 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 boat PC to °“0”
and turns off the transistor TR5 to stop the rewind motor MC. This completes the rewinding of the film.

[Step 155] The flag indicating auto bracketing mode is reset to FABRt-0. Also output boat PF
Set the L output to “0” 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, auto bracketing should not be continued on the newly loaded film, as there is a risk that the subject may be different or the photographer may misunderstand. It is desirable to notify the photographer of this and cancel the auto bracketing mode at the same time. Looking at this in the flowchart of Figure 9, when the film ends after the auto bracketing mark is displayed blinking in step 101, Automatically moves to film rewind. While this film rewind is in progress, the flashing display of the auto bracket mark has not yet been canceled. Therefore, the auto bracket mark, which would not normally be displayed, is displayed during film rewind. The photographer can know that the film has ended without the auto bracket shooting being completely completed.

In other words, this is the warning display. Furthermore, since the flag FABR indicating the auto-bracketing mode is reset to 0 in step 155, the inconvenience of continuing auto-bracketing on newly loaded film as in conventional cameras is eliminated.

According to this embodiment, when auto bracketing shooting is completed, the auto bracketing mode is automatically canceled (step 131), so it is not necessary to perform complicated operation procedures to cancel it as in the past. This eliminates the problem and improves operability. Also, in this case, only the auto bracketing mode is canceled and the information on the amount of change in exposure level is retained, so unless the rQ degree auto bracketing mark and the information are changed, the information will be changed to 1.
This makes it possible to use RJF functions, and there is no need to perform extremely troublesome setting of the information, which has a high probability of using the same information.

(Effect of the invention) As explained above, according to the present invention, the level change jM
level change amount storage means for storing the information set by the setting means until the next level change meter setting; detecting that the ti shadow of the counter means has reached a predetermined number of times; It is equipped with a detection means for canceling the memory of the auto bracket mode of the first stage, and when the auto bracket+-ti shadow is finished, the ten-to bracket mode is automatically canceled and the information on the amount of level change is not canceled. First, when auto bracketing shooting is performed when the auto bracketing mode is reset, the previously stored level change information is used, which prevents erroneous auto bracketing shooting. Auto bracketing can be performed again with a simple operation.

[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. ■...Release button, 2.3...Operation lever, 4...Exposure mode selection knob, 5...
···dial. 6...Switch lid, 7...Storage section, 3
WABR・・・Auto bracket switch, sw
ME...Multiple shooting switch, COM...
・Microcomputer, TD, AD, FD...
...Decoder, 5EGI~5EG5...Display, DIF...Dial interface circuit, MB, MC, MD...Motor, lot...
...Auto bracket mode setting means, 102...
. . . Mode storage means, 103 . . . Auto bracket shooting control means, 105 . . . Level change Ji) setting means, 106 . ...counter means for the number of shots, 1
09...Detection means.

Claims (1)

[Claims] (1) An auto bracketing mode setting means for setting the auto bracketing mode, a mode storage means for storing the mode setting made by the auto bracketing mode setting means, and setting the amount of change in exposure level in auto bracketing shooting. a level change amount setting means; a level change amount storage means for storing information set by the level change amount setting means until the next level change amount setting; an auto-bracketing shooting control means for performing a plurality of shootings; a counter means for counting the number of shootings in the auto-bracketing mode; detecting that the number of shootings by the counter means has reached a predetermined number; An exposure control device for a camera, comprising: a detection means for canceling auto-bracketing mode storage in the mode storage means.