JPS6337328A - Exposure control device for camera - Google Patents

Abstract

PURPOSE:To prevent a valve mode from being overlapped with an auto bracket mode, by providing a valve mode priority means for releasing the auto bracket mode, when the valve mode is set at the time of the auto bracket mode. CONSTITUTION:When the first stroke operation of a release button is discriminated, and the operation is not executed, an auto bracket mode can be set by operating an auto bracket mode setting means 101. Subsequently, whether a valve mode is also set by a valve mode setting means 103 or not is discriminated. In such a case, when the valve mode is set, a release signal is outputted to a mode storage means 102 from a valve mode priority means 104, and the auto bracket mode is released. When the auto bracket mode is stored and held in the mode storage means 102, an auto bracket photographing control means 105 executes plural times photographing which is varied automatically an exposure value, namely, auto bracket photographing.

Description

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

Note that the above-mentioned auto exposure bracketing) (more precisely called auto exposure bracketing) refers to the camera's exposure value (
In the case of automatic exposure, the exposure control 4I is automatically calculated from the subject brightness and film sensitivity (in the case of manual exposure, the shutter speed and aperture value set by the photographer).
Make sure the camera is offset. To say it in the tube,
This means that when photographing a certain subject, the camera automatically takes multiple photographs by changing the exposure value in several stages.

(Background of the Invention) In a camera that can independently set the bulb mode and auto bracket mode, shooting with both modes set is trif7. However, in pulp photography, the difference in exposure level is determined by when the photographer presses and releases the release button. s is originally meaningless.

Therefore, it is unnecessary to shoot using the mode settings of both I+[
If the camera is turned on, there is a risk that the photographer may misunderstand and perform incorrect operations.

(Object of the Invention) An object of the present invention is to provide an exposure M control device for a camera that can solve the above-mentioned problems and eliminate the overlap between the bulb mode and the auto bracket mode.

(Features of the Invention) In order to achieve the above object, the present invention includes a valve mode priority means for canceling the auto bracketing mode when the valve mode is set during the auto bracketing mode. is set first,
The present invention is characterized in that even if the bulb mode is set later, priority is given to photographing in the bulb mode.

(Example for all January) Figure 1 shows JJ Hontsuri Hashige according to an example of the present invention, and the second
The flowchart is shown in the figure. First, press the first release button.
It is determined whether a stroke operation is being performed,
If no operation has been performed, the auto bracket mode can be set by operating the auto bracket mode setting means lO1, and the set auto bracket mode is the zero-order valve mode stored in the mode storage means 102. It is determined whether or not the valve mode setting by the setting F stage 103 has been further performed. If the valve mode is set here, a cancellation signal is output from the valve mode priority means 104 to the mode storage means 102, and the auto bracketing mode is canceled.

When the auto bracketing mode is stored in the mode storage unit 102, the auto bracketing photography control means 105 automatically performs photography with the exposure value changed a plurality of times, that is, auto bracketing 1J! Let the shadows do the work.

(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 one release operation (second stroke) of the release operation means 101, the aperture mechanism, shutter mechanism, etc. are controlled, and photographing is started. When this photographing operation is completed, a charging operation of each of the mechanisms and the like is performed, and then a determination is made as to whether or not the auto bracketing mode is set. When the auto bracketing mode is set here, the auto bracketing shooting control means 102 detects by the detection means 104 that the number of auto bracketing shots counted by the number of shooting counter 103 has reached a predetermined number. The continuous shadowing is continued while the exposure value is automatically changed until the exposure value is changed. As mentioned above, the detection means 104 detects whether or not the number of auto-bracketing shots has reached a predetermined number of times, and upon detecting that the number of auto-bracketing shots has reached the predetermined number of times, it causes the auto-bracketing shooting control means 102 to stop the shooting. Output a signal.

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. FIG. 6 shows the arrangement of each operating member when viewed from the back side. Fourth
In Figures 6 to 6, l is the release button, 2 is the operating lever for selecting the shooting mode of continuous shooting (C) or single shooting (S), 3 is the operating lever for selecting the self-timer, and 4 is the operating lever for selecting the self-timer. The exposure mode selection knob 5 selects shutter priority (Tv), aperture priority (Av), or manual (M) exposure mode. For example, the so-called electronic dial, swM, is equipped with a 2-bit conduction pattern with a 90 degree phase difference and a brush, which is used to set information for each step (0.5 steps or 1 step). With the aperture value setting switch, the aperture value can be changed by pressing the switch swM while in manual exposure mode 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 reflected light from the subject and outputs a light-receiving signal to a high input impedance operational amplifier OPi whose feedback circuit is connected to a compression diode DI. The operational amplifier OPI outputs logarithmically compressed object brightness information By via the resistor R1. Variable resistor VR1 connected to constant voltage source VGI outputs film sensitivity information Sv. An operational amplifier OP2 whose feedback circuit is connected to a resistor R2 calculates and outputs photometric information Ev=(By+Sv). The photometric information Ev is converted into a 4-bit digital value by an A/D converter ADC, and is input to the microcomputer COM PGO-PC3.

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 (PHO to PG3) of the microcomputer COM. be done. 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. 2J depending on which mode is selected by the exposure mode selection knob 4! I! The exposure mode switch 5w5EL is turned on and off, and 2-bit information corresponding to the selected exposure mode is sent to the microcomputer COM (7) manual port PP0.
- Human input to PPI.

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

AD, FD7 and dial interface circuit DI
A 11li source Vbat is supplied to F3. Also, by the first stroke of the release button l, the capo) PA, 0
When the first stroke switch Swl connected to
Rbat is turned on, and the voltage from the power supply Vbat is supplied as the power supply Vcc to circuits that require relatively high power, such as photometric operational amplifiers OPI and OP2.

Input port PAt-ii of microcomputer COM
The second stroke switch sw2 is turned on by the second stroke of the release button L, the mirror up switch sw is turned off by pressing the mirror arm, and turned on by pressing the mirror down.
MRUP, charge completion Y 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, S curtain switch 5w turns on when trailing curtain travel is completed
CN2, a self-switch 5w5E that is turned on when the self-timer is set by the operating lever 3;
LF, sN The switch 5wC5, the aperture value setting switch swM, and the switch lid 6, which are turned on when continuous shooting mode is selected by the operating lever 5 and turned off when single shooting mode is selected, are closed. Switch 5w5ET turns off when opened and turns on when opened.
, the multi-hair photography switch SWME, and the auto-bracketing switch swABR are connected, respectively.

The bases of transistors TR0-TR2 are connected to the output capacitor PEO-PE2 via resistors RIO-12, and the transistors TRO-TR2 are connected to the first clamping magnet MG.
Front curtain magnet MG1 that drives the O1 front curtain. The traffic of the trailing curtain magnet MG2 for driving the trailing curtain is controlled respectively. Also, resistor R1 is connected to output ports PD, PC, and PB.
The bases of transistors TR3 to TR5 are connected through transistors TR3 to TR5, transistor TR3 drives the charging motor MD, transistor TR4 drives the rewinding motor MC, and transistor TR5 drives the film spool at high speed. The driving of the hair curling motor MD is controlled respectively.

The output boat PTD outputs the contents of the shutter speed information register RGTv in the microcomputer 700M to the decoder TD, and the decoder TD converts the contents into a signal for displaying the shutter speed seconds and displays it on the connected liquid crystal, etc. The signal is output to the configured display device 5EG1.

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 "l" signal from output port PFL manually. If so, a signal for displaying a decrease in the number of bracket marks is output to the connected display 5EG2, which is composed of a liquid crystal or the like. When a signal of °゛l゛ is input manually from the output boat PABR, a signal for displaying an auto bracket mark is output to the display 5EG2.

From the output boat PME, a signal of "l" or "0" is output to the display 5EG4, which is composed of a liquid crystal, etc.
When the signal "l" is input to G4, a multi-hair photography mark is displayed.

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 frequently used sheet number information register RGMH 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 PAY, 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 DAY 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 on signal of wl is manually input to the PAO, the process proceeds to step 2.

[Step 2] Output a "1" signal from the output PF, turn on the transistor TRbat, and turn on the "output source Vc".
First, a photometry timer is started. The photometry timer is the first stroke switch swl.
This is to keep the power supply Vcc continuously supplied for a predetermined period of time from the input of the off signal of
It is possible to change the setting information while viewing the display using the exposure mode selection knob 4. 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 PPI. 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 store the result (aperture information Av) in the aperture information register RGAv. let It is assumed that the contents of all registers in the microcomputer 200M are held while the memory BAT is loaded. Further, when the battery BAT is loaded for the first time, it is assumed that information such as a frequently used value 1, for example 17125 seconds, is initially set.

[Step 6] The contents of the register RGBH that stores the information on the number of exposure steps of auto bracketing are stored in the register RGBA for the number of bracketing means of the aperture. Also, the contents of the register RGBT for the number of bracketing means of the shutter are set to zero (0).

[Step 2 Step 7] The state of the flag FABR indicating whether or not the auto bracket mode is set is determined.

Assuming that auto bracketing mode is not currently set, proceed to step 8.

[Step 8] The state of the flag FMH indicating whether or not the multi-hair photography mode is set is determined.

Imada (<W Assuming shadow mode is not set.

Proceed to step 9.

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

[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 1 display 5EG5, and the set shutter speed time is displayed on the display SEG1.

[Step ill] Determine whether the second stroke of the release button 1 is performed and the on signal of the second stroke switch sw2 is input to the human capo PAL.
Assuming that the on signal of the younger 2nd stroke SW2 is not inputted, the process returns to the start. Also, while the ON signal of the first stroke switch swl is being input, 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] From the contents of register RGEv, subtract the contents of register RGAv, which stores the information set by the operation of dial 5 and aperture value setting switch swM, and add the result to register RG for shutter information.
Store it on TV.

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 bracketing means number register RGBR, which stores the exposure step number information of auto bracketing, are stored in the shutter bracketing means number register RGBT. Also, the contents of the register RGBA for the number of aperture rib racking means 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, and the shutter speed calculated by the calculation is displayed on the display 5EG1. 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 the shutter speed information set by operating the dial 5
The contents of are stored in the shutter information register RGTv. This is manual exposure mode.When single bracket shooting is set, the contents of register RGTv change every time a shot is taken, so the information set by operating dial 5 is stored as is, so please refer to the details below. This will be explained later.

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 evening time of Shear 2 is displayed on the display 5EGI.

Next, we will describe information setting by dial operation while the photometry timer is operating. If the release button I is stopped (first stroke) in the middle of the above sequence, the first stroke
An OFF signal for the stroke switch swl is input, and the program advances from step 1 to step 20.

[Step 20] Whether or not the switch 6 has been opened is determined by r1 based on the state of the switch 5w5ET. Assuming switch 46 remains closed, the human-powered boat PA
Since the off signal of switch 5w5ET is input manually at 9,
Proceed to step 21.

[Step 211J11 Determine whether or not the optical timer is in operation. Since this is immediately after the photometry timer has been activated 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 PP1. If the shafter 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, a routine for reading additional information accompanying dial operations will be explained with reference to FIG.

"Information Reading Routine" [Step 80] The information input to the input ports PHO 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 2 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] It is determined 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 it is not currently the valve 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. By doing so, the aperture value and the shutter speed are displayed on the displays 5EGI and 5 in step IO.
Each can be displayed on the EG5.

Further, if the aperture priority mode is set, the process proceeds from step 22 to step 26 and 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 aperture value and the shutter speed can be displayed on the displays 5EGl and 5EG5 in step 10, as in the case of 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] Determine whether the aperture & i setting switch swM is on/off. In manual exposure mode, operate the aperture value setting switch swM and perform dial operation to set the aperture value. Only dial operation is performed. As a result, the shutter speed is changed +r (function), so when the swift switch swM is on, the same routine as in the aperture priority mode (step 2
The process proceeds to step 7), and when it is off, the process proceeds to step 23, which is the same as in the shutter priority mode.

When a predetermined period of time has elapsed since 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 303 Output boats PTD, PFL.

The outputs of PABR, PME, and PFD are set to "θ'", and all displays on the display devices 5EGl-SEG5 (however, the display device 5EG2 is not present) are turned off. Also, the output of the output capacitor) PF is set to 60°, the transistor TRbat is turned off, and the supply of the power supply Vcc is stopped.

[Step 311 Similar to Step 9, the flag FsAB indicating whether the auto bracketing switch swABR has been operated and the flag FsME indicating whether the multi-hair photography switch swME has been operated are both reset to 0.

The program then jumps to start.

Therefore, after the 6-light timer ends, the standby mode of step 1→step 20→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 46 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 SwAB
Since the switch 6 has just been opened and the auto bracket switch 5WABR has not been operated, the process proceeds to step 41.

[Step 41] The multi-hair photography switch swME is determined. Similarly, since the multiplex photographing switch swME has not been operated, the process advances to step 42.

[Step 42] A flag FsME indicating whether a suppression operation of the multiplex photographing switch swME has been performed is determined. In the initial loading state of the battery BAT and in the ON state of the first stroke switch swl, the flag FsME is reset to O in step 9, so step 4
Proceed to step 3.

[Step 43] Auto bracket switch SwAB
Flag FsAB indicating whether a pressing operation has been performed for R
As in step 42, the flag FsME has been reset to O in step 9, so the step 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-bracket switch swABR is suppressed, an on-signal is manually input to the capo (PALL). 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 451 Auto bracket switch SwAB
The flag FsAB indicating that R is turned on is set to l, and the multi-ff1l! A flag FsME indicating that the shadow switch swME is on is reset to 0.

[Step 46] Output capo) PTD, PFL.

The outputs of PABR, PME, and PFD are set to "θ", and all the displays on the display SEG l-3EG5 are turned off. Next, set only the output of the output boat PABR to "l" and display 5
Turn on the EG3 auto bracket mark. This makes it clear that the auto bracketing mode is set! 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, if the step number information is set to 1, for example 0.5 by the dial 5 in step 80, then the step number is r-0,5,0°0.5'', and if l is set, r Exposure was automatically changed in steps of -1, 0, and IJ. Three preset auto bracket shots will be taken. In addition, the above “−〇.

Shooting with a number of steps of 5.0 or 0.51 means an exposure value that is -0 or 5 steps under the standard exposure value calculated by calculation, a standard exposure value, or 0 to the standard exposure value. .5
This means that photography is performed continuously using three levels of exposure values, including exposure values that are one step over.

[Step 49] Register RGB for number of bracketing means
Add the contents of H and the contents of the dial, and register RG again.
Store it in BH. As mentioned above, the minimum decomposition moat by one click of the dial 5 can be freely set at every step of 0 and 5 or every step. Note that if the shutter speed and 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 relevant to the actual situation. Further, the contents of the register RGBH are output from the output 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 Ay of the apex f1 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 411 display is Fl, 4 to F32, every 0.5 steps, total 14 types, auto bracket display is 0 at θ to 5.
．． If it is every 5 stages, there are 11 types in total, 30 types in total, and 31 types if you include a blank code.By adding a certain constant when sending data to the output boat PFD, the decoder FD determines which information it is. 11 can be divided, and the appropriate number 1 display is of clear.

[Step 50] A flag FMH indicating whether the multi-iTf lj shadow mode is set is determined. If the multi-shade shooting 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 frequent shots to "3". This is because the number of auto bracket shots is predetermined to be three, so it is mandatory even if the number of shots for multiple shots is set arbitrarily. 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 7-lag FsAB is set to 1 in step 45, so even if the 5WABR off signal is input, the program continues from step 40 → step 41 → step 42 → stay, step 43 → step 48, the auto-bracketing means number change mode can be maintained with dial 5, and the photographer can operate dial 5 with the suppression operation of switch swABR stopped. becomes Ofo.

The automatic bracketing means number change 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 in step 9, 7
The lag FSAB is reset to O, and its display is also switched to a normal display at step IO. Also switch 5w5ET
When the off signal is input manually, step 20 → step 2
In the process of the program proceeding from step 1 to step 30 to step 31, the auto bracketing mark display disappears at step 30, and the flag FsAB is reset at step 31, so that the mode does not proceed to the auto bracketing means number changing mode again.

Next, exposure calculation in auto bracketing mode will be explained. In the case of the shutter priority mode, the contents of the register RGBH for the number of bracketing means are stored in the register RGBA for the number of aperture bracketing means as described in step 6, and in the case of the shutter priority mode and manual exposure mode, the contents of the register RGBH for the number of bracketing means are stored in the register RGBA for the number of aperture bracketing means.
As mentioned in the shutter bracket means number register RGB
T memorizes each. In step 7, since the auto bracketing mode is set and the flag FABR is set to l, the process advances to step 52.

[Step 52] Register RGBH for number of bracketing means
It is determined whether the content of is zero or not. If the content is zero, photography will be performed three times with the same exposure (standard exposure in the embodiment), which is meaningless, so it is necessary to prohibit auto-bracket photography. Therefore, in this case, the process advances to step 53.

[Step 53: Reset the flag FABR indicating auto bracket mode to O. Matade Capo) PABR
Set the output to “0°°” and turn off the Saiichi Tobrakerato mark display.

Next, by proceeding to step 8, the exposure calculation for ``audopracare'' is not performed, the flag FsAB is reset to 0, and a normal routine is executed.

In step 52, if the contents of the bracketing means 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 PABR to 1
'', and the auto bracket mark is displayed. This is because when the switch 46 is closed due to the auto bracket mode setting condition and the switch 5w5ET is turned off, the display is completely erased in step 30, so the first stroke switch This is because when swl is turned on, it is necessary to turn on the light once.

[Step 55] It is determined whether the first stroke switch SWl 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 means number register RGBA are added and stored in the 11 degree register RGAv. Also, add the contents of the shutter information register RGTv and the contents of the shutter bracket means number register RGBT, and add the contents of the register RGTv again.
Store it in GTv. 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 auto-bracketing means. In other words, if the number of auto-bracketing means is set so as not to be a negative number at step 49, the value after the calculation at step 56 will be the standard exposure value 1.
The exposure value is on the under side compared to the actual value. Further, in manual exposure mode, step 14 similar to that in aperture priority mode is passed.

Since the shutter speed is changed and the aperture value is not changed as in conventional cameras, auto-bracketing photography with a constant depth of field and only exposure is possible.

Further, in step 55, the first stroke inch sw
If it is determined that l is off, the exposure calculation in step 56 is not performed because the photometry timer is operating.
In step 10, the standard exposure value will be displayed.

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 exposure value on the under side in this example, is displayed, and the metering timer is activated. Is there a sign inside? F. The exposure value will be displayed. This results in
The photographer can easily recognize the exposure value of auto bracketing.

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

Plaquette shooting in pulp photography is basically meaningless, so it is more effective to cancel the eau de plaquette mode. Therefore, if it is determined in step 25 that it is a valve motor, the process proceeds to step 57.

[Step 57] Set the output of output port PABR to “0°”
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.

In conjunction with the opening of switch Waka 6, switch SWM
When the ON signal of E is input manually, the process proceeds from step 41 to step 60.

[Step 60] A flag FsME is set to 1, indicating that the hair photography switch swME is turned on. Also, a flag FsAB indicating that the auto bracket switch swABR is turned on is reset to 0.

[Step 61] Output ports PTD, PFL.

PABR, PME, PFDcy) output “0”,
Turn off all displays. Next, the output of only the output port PME is set to "1", and the multi!Tf IM shadow mode mark is displayed on the display SEG4.

[Step 62] Flag FM indicating multi-m W shadow mode
Set E to 1.

[Step 63] It is determined whether the mode is auto bracket mode or not. If the mode is auto bracket 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 66] Add the contents of the multiplexing number register ROMH and the contents of the dial register RGH, and store the result in the register ROMH again. Since the number of clicks is an integer, if the resolution of one click of the dial 5 is 0.5 steps, the contents of the dial register RGH are doubled and then added. 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 register RGMH for multi-ton sheet 4 are outputted 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 manually input, the flag FsME is set to 1 in step 60, so even if the switch swME is turned off and No. 1 is input afterwards, the process continues from step 41→step 42→ Proceeding to step 63, it becomes possible to maintain the multiple shooting number setting mode.To shift from the auto-bracketing means number changing mode to the multiple shooting setting mode, it is enough to turn on the switch swME once. It is clear from the flowchart in FIG. 7 that the reverse transition can also be made by turning on the switch swABR once.

Next, if the number of times of hair-raising is set once and then the number of hair-raising is set to zero (0), it is necessary to cancel the multiple photography mode and turn off the multiple photography 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 O. Also, the output of output port PME is set to “O”.
, and turn off the multi-hair photography 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 7o.

[Step 70] Set the output of the output port PME to "°1" and display the multiple shooting mark. This is done in step 3.
0 turns off all the displays, so when the first stroke of the release button l is made again, it will be shown that the camera is in multi-hair photography mode. This is to let Horomizo know.

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

Next, the sequence after the second stroke of the release button I will be described. When the second stroke of the release button l is performed and the on signal (release signal) of the second stroke switch sw2 is input to the input capo PAL, the process advances from step 11 in FIG. 7 to step 100 in FIG. 9. .

[Step 100] Flag FABR indicates whether auto bracket mode is set! Distinguished by island. Step 101 if in auto bracket mode
, otherwise proceed to step lO2.

[Step 1011 Output of output port PFL”
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] r4 whether the ON signal of the self-switch 5ELF is manually input to the PA 6
Do another. If the ON signal has been manually input, the process proceeds to step 103 since it is self-timer photography; otherwise, the process proceeds to step 104.

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

[Step 104] Output the contents of the aperture information register RGAy from PAV. This results in
The aperture control drive circuit DAY is the register RGAv.
The content of is converted into actual aperture information, and aperture control is started via an aperture drive actuator CAV such as a stepping motor.

[Step 105] A pulse signal is output from the output port PEO to turn on the transistor TRO and energize the first clamping combination magnet (mirror-up magnet) MGO.

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 port PA2.Here, the process is performed until the on signal is input, that is, until the mirror is fully up. Repeat this loop until the image is completely uploaded, and then proceed 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 port 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 1101 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 ill] 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,
Output capo) Outputs a pulse signal from PE2, turns on transistor TR2, and connects the shutter rear curtain magnet MG2.
energize. This causes the shutter trailing curtain to run.

[Step 113] It is determined whether or not the ON signal of the shutter rear curtain switch s w CN 2 is input to the human-powered boat PA5. This loop is repeated until completion, and upon completion, the process proceeds to step 114.

[Step 114] Set the output of output port PAV to O”
Make it. As a result, the diaphragm returns to its open state.

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

[Step 116] It is determined whether the multiple shooting mode is set or not based on the state of the flag FME. If it is the multiple shooting mode, the process proceeds to step 117; otherwise, the process proceeds to step 120.

[Step 117] Calculate 1 from the contents of the hair count register RGME by 'B&, and set the if degree to the register RGM.
Let H memorize it.

[Step 118] It is determined whether the contents of the hair count register RGME are zero. If it is zero, the process advances to step 119; if not, the process advances to step 121.

[Step 119] Since the content of the register RGME for the number of hairs is O, it means that the hairs photography has ended, so the flag FME indicating the hairs photography mode is reset to 0. Also, the output of the output port PME is set to "O°", and the multi-hair photography mark display is turned off.

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

If the multiple shooting mode continues for 1 meter, the contents of the multiplex number register RGME are not zero, so step tta
The process then proceeds to step 121, and since step 120 is not passed, film feeding is not performed, and therefore multiple shots are taken. Further, when the multi-photographing is completed, the contents of the register ROMH become zero, so that the film is fed in step 120 after canceling the multi-photographing mode as described above.

[Step 121] Determine whether or not the on signal of the charging completion detection switch swCGE is input to the manual port PA3.The on signal is not input.
That is, if charging is not completed, the process advances to step 123, and when charging is completed, the process advances to step 122.

[Step 122] Since charging is completed, the output of the output boat PD is set to "θ" and the power to the charging motor MD is cut off.

[Step 123] Switch swFLM is turned on every time one frame of film is fed to the input port PA4.
On signal/on signal to determine whether the number is being operated manually
has not been entered, that is, the feeding of one frame of film has been completed.
If not, the process proceeds to step 124, and when the process is completed, the process proceeds to step 125.

[Step 124] Determine the state of the film feeding timer. When the film ends Y, it is 1- from then on.

Since film feeding is not possible, the switch swFLM is never turned on, and in such a case, the timer for film feeding, which is a one-second timer, for example, finishes counting. When the time measurement ends, the process advances to step 150, and when the time measurement has not ended, 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 capacitor PH is set to "O", the transistor TR5 is turned off, and the film feeding motor MB is stopped.

[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 1271 Determines whether or not auto bracketing has been performed three times.As mentioned above, Oud Placent ti shadows are taken continuously at three exposure levels: under, standard, and over. Therefore, if the three shootings are not 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 means number register GRBT are subtracted from the contents of the shutter bracket 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 should be noted that from this calculation formula (subtraction formula), 111 white will be the standard exposure for the second 11 shooting and overexposure for the third shot.

[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 jumps to NEXT2, step 104. 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] It is determined whether the off signal of the first stroke switch SW2 is manually input. If this off signal is not input, 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 bar display in step 55, the underexposure value during auto bracketing shooting can be confirmed. It is convenient to check all exposure displays, including standard values and overexposure values, during the shooting sequence. When the off signal of the first stroke switch sw2 is manually input, the process proceeds to step 131.

[Step l3ffi'] The flag FABR indicating auto bracketing mode is reset to O. Also, the output of the output; t'-to PFL is set to "0", and the flashing display of the auto bracket mark is turned off.

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] Based on the on/off state of the switch 5wC5 input to the human capo-1-PA7, it is determined whether it is a quick shooting mode or a single shooting mode.If it is continuous shooting mode, return to the start, and in this case, press the release button. l suppression operations are performed, and the first. Since the on signal of the second stroke switch swl, 2 is manually input, the next shooting begins. In the case of single shooting mode, the process advances to step 133.

[Step 133] The camera waits for the OFF signal of the first stroke switch SW2 (-) to be turned off manually. Since this is a single-shot mode, the camera will not proceed to the next shooting sequence unless the photographer stops the suppression operation of the release button L by pressing +h. If no ON signal is input, it returns to the start.

Next, tJ! A case will be described in which the film ends in the middle of a shadow. In this case, as described above, the time measurement by the film timer, which is, for example, a one-second timer, ends, so the process proceeds from step 124 to step 150.

[Step 150] Set the output of the output boat Pc to °l°
", the transistor TR5 is turned on and the rewind motor MC is rotated. As a result, rewinding of the film is started.

[Step 2 1511 Starts a rewind timer used to detect whether rewinding of the film has finished.

[Stella 7'152] Film switch s wFL
It is determined whether the state of M has changed or not. If it has changed, the process returns to step 151, and the freshness rewind timer is started. If there is no change, the process proceeds to step 153.

[Step 153] It is determined whether or not the time measurement by the rewind timer has ended. If the process 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 rewinding the film. 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 °“O”
and turns off the transistor TR5 to stop the rewind motor MC. Thereby, the rewinding of the film comes to an end γ.

[Step 155] A flag FABR indicating auto bracketing mode is reset to O. Also output boat PFL
Set the 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,
lf in a row! If you need to color the film and the end of the film occurs, you will enter the routine after step 150 at the 1st frame or 2nd frame V1.In such a case, auto bracketing will be applied to the newly loaded film. Continuing the shooting is due to the risk that the subject may be different or if the subject is different.
Since there is an iq ability to understand the depth of the shadow, it is desirable to inform the photographer of this fact and at the same time cancel the auto bracketing mode. Looking at this in the flowchart of FIG. 9, when the film ends after the auto-bracketing mark is flashed in step 101, the process automatically shifts to film rewinding. 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. Auto bracket ll! The photographer can know that the film has ended without the shadow completely ending. In other words, this is the warning display. Also,
Since the flag FABR indicating the auto-bracketing mode is reset to 0 in step 155, the inconvenience of continuing auto-bracketing (tfia shadow) on newly loaded film as in conventional cameras is eliminated.

According to this embodiment, even if the auto bracketing mode is set, if the bulb mode is subsequently set, priority is given to shooting in the bulb mode (step 25 → step 57). ), bulb photography is executed in response to the press of the release button by the photographer, eliminating the risk of the photographer making an incorrect operation.

(Effect of IJI L) According to the present invention, when the valve mode is set during the auto bracket mode, a valve mode priority means is provided for canceling the auto bracket mode, Therefore, even if the auto bracket mode is set first and the valve mode is set later, the ll! by valve mode can be set. By giving priority to shadows, we can eliminate the overlap between bulb mode and auto bracketing mode.

[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, s wA B R ... Auto bracket switch, swME ... Multiple lj! W
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, 1
04... Valve mode priority means, 105...
...Auto bracket shooting control - 1 step.

Claims (1)

[Claims] (1) An auto bracketing mode setting means for setting the auto bracketing mode, a storage means for storing the auto bracketing mode set by the auto bracketing mode setting means, and a storage means for automatically changing the exposure value to perform shooting multiple times. An exposure control device for a camera, comprising: an auto-bracketing photography control means for controlling the auto-bracketing mode; and a bulb-mode priority means for canceling the auto-bracketing mode when the bulb mode is set during the auto-bracketing mode.