JPS6337323A - Exposure control device for camera - Google Patents

Abstract

PURPOSE:To prevent wrong auto bracket photographing from being executed, and also, to improve the operability by providing a detecting means for detecting a fact that a photographing frequency of a counter means has reached a prescribed frequency, and releasing an auto bracket mode storage of a mode storage means in accordance with said detection. CONSTITUTION:When the first auto bracket photographing is ended, a charge operation of each mechanism, etc., is executed, and whether an auto bracket mode is set or not is discriminated. In such a case, since the auto bracket mode is set, an auto bracket photographing control means 103 continues the continuous photographing by varying automatically an exposure value, until it is detected by a detecting means 107 that an auto bracket photographing frequency counted by a photographing frequency counter 106 has reached a prescribed frequency. When it is detected that the auto bracket photographing frequency has reached the prescribed frequency, the detecting means 107 outputs a stop signal to the auto bracket photographing control means 103, and also, outputs a release signal to a mode storage means 102.

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 f. It is.

Note that the auto bracketing (iE properly refers to it as auto exposure bracketing) refers to the camera's exposure value (
In the case of automatic exposure, this refers to the offset of the camera relative to the exposure control value that is automatically calculated from the subject brightness and film sensitivity; in the case of manual exposure, it refers to the offset of the camera relative to the shutter speed and aperture value set by the photographer. Simply put, 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 conventional device of this type, the exposure value is automatically changed to determine the set number of film frames Ij! Even after finishing shadowing, the mode remains in auto bracketing mode unless you cancel it, and you may forget to cancel it.

In addition, in order to reduce the number of camera operation switches as much as possible, settings such as auto bracketing mode often double as switches for other information settings, which requires complicated operations and can lead to operational errors. It is the cause. Also, canceling this mode required a similar operation procedure, which was troublesome. Of course, this is more advantageous for people who take all their photos in auto bracketing mode, but for beginners, it is better to use only one shooting state (subject state).
In many cases, auto bracketing mode is used only in

Therefore, in the past, if the photographer forgets to cancel the mode, there is a risk that auto-bladder two-shot shooting will start the next time the photographer takes an image, resulting in an unintended image being taken. In order to do so, the user had to perform complicated operations as described above, and the camera could not be considered easy to use.

(Purpose of the invention) The object of the present invention is to solve the above-mentioned problems.

To provide an exposure control device for a camera that can prevent erroneous auto-bracket photography and improve operability.

(Features of the Invention) Item L [To achieve objective 1, the present invention detects that the number of shots taken by the counter means reaches a predetermined number, and stores the auto bracketing mode in the mode storage means in response to the detection. Equipped with a detection means to release it.

If auto bracketing shooting has finished.

The feature is that the auto bracketing mode is automatically canceled.

(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 setting means 101, the mode storage means 102 stores the auto-bracketing mode and transmits this 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.

Thereafter, when the photographer performs a release operation (second stroke) of the release operation means 105, the auto-bracket photography control means 103 controls the aperture mechanism, shutter mechanism, etc., and starts auto-bracket photography. When the first auto-bracket photographing is completed, the various mechanisms described above are charged, and then a determination is made as to whether or not the auto-bracket mode is set. Since the auto-bracketing mode is set here, the auto-bracketing control hand-down 103 detects by the detection means 107 that the number of auto-bracketing shots counted by the number of shots counter 106 has reached a predetermined number. Continue shooting continuously while automatically changing the exposure value until As can be seen from the foregoing, the detection means 107 detects whether or not the number of auto-bracketing shots has reached a predetermined number, and when ts detects that the number of auto-bracketing shots has reached the predetermined number, the auto-bracketing control means 103 stops the shooting. At the same time, it outputs a release signal to the mode storage means 102. As a result, auto-bracketing photography ends and auto-bracketing mode is canceled. Furthermore, by canceling the auto-bracketing mode, displaying the auto-bracketing mode on the display means 104 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 when a predetermined number of times is detected, a stop signal is output to stop auto-bracketing. However, the exposure value may be changed every time a release operation is performed, and an auto bracketing mode may be 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 looking from above. Figure 6 shows the arrangement of each operating member when viewed from the back side.
In Figures 6 to 6, l is the release button, 2 is the operation for selecting the shooting mode of rapid shooting (C), and single shooting (S), 8-13 is the operation lever for selecting the self-timer, and 4 is the operation lever for selecting the self-timer. Exposure mode selection knob selects shutter priority (Tv), aperture priority (Ay), or manual (M) exposure mode; 5 is shutter speed, aperture value, or exposure step information during auto bracketing shooting (for example, information for each 0.5 step or 1 step), etc. 1. For example, a so-called electronic dial with a 2-bit conductive pattern and a brush that are 90 degrees out of phase with each other. swM is the aperture value. By pressing the setting switch swM and operating the dial 5 in the manual exposure mode, the aperture value can be changed. 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 the received light signal to a high input impedance operational amplifier O.Pi whose feedback circuit is connected to a compression diode DI. Operational amplifier OPI outputs logarithmically compressed object brightness information IBv via resistor R1. J to constant voltage source vGl! The i-connected variable resistor VR1 outputs film sensitivity information Sv. Operational amplifier OP2 with resistor R2 connected to the feedback circuit
calculates and outputs photometric information Ey=(By+Sv). The photometric information Ev is converted into a 4-bit digital value by an A/D converter ADC, and is input to input ports PGO-PG3 of the microcomputer COM.

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 inputted to the input ports PH0-PO2 of the microcomputer COM. . The information in the dial interface circuit DIF is such that the pulse signal is sent to the output port P of the microcomputer COM.
It is reset by input from E3. Depending on which mode is selected by the exposure mode selection knob 4, the two series of exposure mode switches 5w5EL are turned on and off, and 2-bit information corresponding to the selected exposure mode is sent to the input ports PPO to PPI of the microcomputer COM. Man-powered.

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

AD, FD and dial interface circuit DI
A power supply Vbat is supplied to F and the like. Also, by the first stroke of the release button l, the input capo) PAO is j1
When the connected first stroke switch Swl is turned on, the potential of the output port PF becomes high level, so the inverter INV and resistor R3 turn on the transistor TRb.
at turns on, and the voltage from the power supply Vbat becomes the power supply Vc.
As c, the photometric operational amplifiers OPI and OP2 are supplied to a circuit that consumes power in an equal ratio and equal gravity.

Input port PAt-tt of microcomputer COM
There is a second stroke switch s w2 that is turned on by the second stroke of the release button L; a mirror up switch sw that is turned off when the mirror is up and turned on when the mirror is down;
MRUP, charging completion detection switch sw CG E, which turns on when mechanical charging is completed; film switch swFLM, which turns on every time one frame of film is fed; trailing curtain switch, which turns on when trailing curtain travel is completed. 5wCN2, a self-switch 5 that is turned on when the self-timer is set by the operating lever 3;
w5ELF, a switch 5wC5 that is turned on when continuous shooting mode is selected by the operation lever 5, and turned off when single shooting mode is selected, the aperture value setting switch SWM, and the switch lid 6 are closed. Switch 5w5E that is off at times and on when opened
T, the multiplex photography switch SWME, and the auto bracket switch swABR are connected to each other.

The bases of transistors TR0-TR2 are connected to the output boats PEO-PE2 via resistors RIO-12, and the transistors TRO-TR2 are connected to the first clamping magnet MG.
O, controls the energization of the leading curtain magnet MC1 that causes the leading curtain to run, and the trailing curtain magnet 1-MG2 that causes the trailing curtain to run, respectively. Also, resistor R13 is installed on the output boats PD, PC, and PB.
~15, the bases of transistors TR3-5 are connected to la
&! and the transistor TR3 is connected to the charge river 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.

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

Output ports PFL and PABR output signals of "l" (meaning high level) or "O" (meaning low level) to decoder AD, and decoder AD receives a signal of "1" from output port PFL. If entered,
The connected display 5EG2, which is composed of a liquid crystal, etc., outputs a signal for displaying a bracket mark point reduction. If a signal of “1” is input from the output boat PABR,
Display unit 5EG2 outputs a signal for displaying a bracket mark.

Output Capo) The PME outputs a signal of °°l' or "O" to the display 5EG4 composed of a liquid crystal, etc., and when the signal of "1" is input, the display 5EG4 performs multiple shooting. Displays a mark.

From the output boat PFD, a microcomputer 200M
The contents of the aperture value information register RGAv, the contents of the auto bracketing step information register RGBH, or the contents of the multiplex number information register 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 PAV, the contents of the aperture value information register RGAv in the microcomputer 200M are output to the aperture control drive circuit DAY. The drive circuit DAY is connected to the drive actuator CA.
V, outputs information converted into actual aperture information to, for example, a stepping motor, and drives this 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] I to temporary U! When only the first stroke of the release button 1 is performed by the user and the ON signal of the first stroke switch swl is input to the input capo (PAO),
Proceed to step 2.

[Step 2] Output the low signal of "l" from the output capo-PF, turn on the transistor TRbat, and turn on the power supply Vc.
Then, the photometry timer is started. The photometering timer is used to continuously supply power Vcc for a predetermined period of time from the manual off signal of the first stroke switch swl, so that even if the photographer presses his/her hand from the release button L, the photometry will continue for a predetermined period of time. You can check the status and change the setting information while viewing the display using the exposure mode selection knob 4.This configuration can be easily done using the hardware timer built into the microcomputer COM. can.

[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] Determine whether or not the shutter priority mode is set based on the manual state of the input boats Pro and PPl. If the shutter priority mode is currently set, proceed to step 5.

[Step 5] Subtract the contents of the shutter information register RGTv, which stores the information set by operating the dial 5, from the contents of the register RGEv, and store the result (aperture information Ay) in the aperture information register RGAv. let It is assumed that the contents of all registers in the microcomputer 200M are retained while the battery BAT is loaded, and 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 the multiple tit shadow mode is set.

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

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

In step 101, 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, respectively.

[Step 111 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 being manually applied to the human-powered boat PAL.
Assuming that the on signal of the younger 2-stroke switch SW2 is not manually input, the process returns to the start. Further, while the ON signal of the first stroke switch swl is manually input, calculation information can be obtained from the subject brightness information, film sensitivity information, and setting information by this routine, and these 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 A1 setting switch swM, and add the result to shutter information register RG.
Store it on TV.

Note that when the battery BAT is loaded for the first time, a frequently used value 1, for example, F5.6, is initially set.

[Step 14] The contents of the bracket stage number register RGBR, which stores the exposure stage number information of the auto bracket, are stored in the shirt tabular 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] 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 because when auto bracket shooting is set in manual exposure mode, the contents of register RGTv change every time you shoot.

This is to store the information set by operating the dial 5 as is, and the details will be described later.

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 20] It is determined whether the switch lid 6 has been opened or not based on the state of the switch 5w5ET. Assuming that the switch lid 6 remains closed, the input port PA
Since the off signal of switch 5w5ET is input manually at 9,
Proceed to step 21.

[Step 21] It is determined whether or not the 0-light timer is in operation. Here, since 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 PPl. If the shutter priority mode is currently set, the process proceeds to step 23.

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

r Information reading routine J [Step 80] Store the information input to the input ports PH0 to PH3 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 number f^ is positive or negative depending on the direction of rotation of the dial 5. That is, 4-bit information indicating how many steps to shift up or down from the current information is stored.

[Step 81] Output the pulse signal of 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 the shutter information register RGTv again.

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

[Step 25] Determine whether or not a certain code indicating the valve mode located next to the longest second of the shutter speed is stored in the register RGTM.If the current pulp mode is not present, proceed 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 lO.
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 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 the on/off state of the aperture value setting switch swM. In the manual exposure mode, operate the aperture value setting switch swM and operate the dial to set the aperture value, and only by dialing the shirt button. Since the configuration is such that the time in seconds can be changed (u), when the switch swM is on, the process proceeds to the same routine (step 27) as in the aperture priority mode, and when it is off, the shutter The routine proceeds to execution of the same routine (step 23) as in the priority mode.

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

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

[Step 30] Output boats PTD, PFL.

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

[Step 31] Similar to step 9, the flag FsAB indicating whether the auto bracket switch swABR has been operated or not, and the multiplex Ii! Flags F s M E indicating whether the shadow switch SWME has been operated are both reset to 0.

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 manually input to input boat PA9. The program then proceeds from step 20 to step 40.

[Step 40] Auto bracket switch SwA
Since the switch 6 for BH determination has just been opened and the auto bracketing switch 5WABR has not been operated, the process advances 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] The flag FsME is determined to indicate whether or not the multiple shooting switch swME has been pressed. In the initial state of battery BAT loading and when the first stroke switch swl is on, the flag FsME is set in step 9. Since O has been reset, Stella 24
Proceed to step 3.

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

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

Next, from the above state, 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 manual boat 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 pulp mode. If the contents are in the pulp mode, the process returns to the start and the auto bracketing mode is not entered.

If the pulp 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 boats PTD, PFL.

The outputs of PABR, PME, and PFD are set to 0, and all the displays on the display 5EGIN5EG5 are turned off. Next, only the output of the output boat PABR is set to "1", and the auto bracket mark on the display 5EG3 is lit. This allows the person in the shadow to clearly know that the auto bracket 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, in step 80, for example, if the stage number information of 0.5 is set by the dial 5, the stage number is r-0,5,0°0.5'', and if l is set, r -3 preset auto brackets that automatically change exposure in steps of 1, 0, and IJ! Shadow will be done. In addition, the above “−〇.

Shooting with a step number of 5, 0, 0, 5 means an exposure value that is -0.59 below the standard exposure value calculated by calculation, a standard exposure value, or 0 for the standard exposure value. This means that images are taken consecutively at three levels of exposure value: .5 levels overexposure value.

[Step 49] Bracket stage number register RGB
Add the contents of H and the contents of the dial, and register RG again.
Store it in BH. As mentioned above, the minimum resolution by one click of the dial 5 can be set freely in increments of 0.5 steps or in increments of 1 step. Note that if the shutter speed and aperture value are different from the resolution bottle, it is sufficient to insert a program that multiplies the contents of the register RGBH by an integer, and a detailed explanation will be omitted here since this is not relevant to the actual situation. Also, the contents of the register RGBH are output from the output port PFD, and the 1 display 5EG5 displays a numerical value indicating the number of stages, for example, "Q, 5J".The decoder FD and display 5EG5 used recently can also be used to display the aperture. The decoding of the aperture value is based on the F number number rather than the Ay of the apex value, and the decoding of the auto bracket is, for example, several meters every 0.5 stops, so it is necessary to change the decoding contents. .

For example, if the output from the output port PFD is 5 bits, 32 types of data can be sent, so if the aperture value display is Fl, 4 to F32, every 0.5 stop, there are 14 types in total, and auto bracketing. If the display is θ ~ 5 and every 0.5 step, there are 11 types in total, 30 types in total, 31 types including blank code, and by adding a certain constant when sending data to the output capo (PFD) Decoder F
It is possible to determine which information D is, and the appropriate numerical representation is +il balance.

[Step 50] A flag FMH indicating whether the multi-ff1ti shadow mode is set is determined. If the multi-hair photography mode is not set, the process returns to the start. If the mode is multiple shooting mode, the process advances to step 51.

[Step 51] Set the contents of the register RGME for the number of multiple shots to "3". This is because the number of auto bracket shots is predetermined to be three, so even if the number of times for multiple shots is set arbitrarily, it is mandatory. The program returns to the start in order to prevent the photographer from making operational mistakes and to eliminate the risk of erroneous exposure. Furthermore, once the on signal of the switch 5WABR is input, the flag FsABt-1 is set in step 45, so even if the swABR off signal is input, the program continues from step 40 → step 41 → step 42. → Step 43 → Step 48, and the auto bladder 2 step number change mode can be maintained using the dial 5, and the photographer can operate the dial 5 while stopping the pressing operation of the switch swABR. (Becomes Noh.

The auto bracket stage number changing mode can be canceled by turning on the first stroke switch swl, or by closing the switch lid 6 and turning off the switch swSET. In other words, the first stroke switch swl
When the ON signal is input, step l → step 2 →
The program progresses from step 3 to..., flag FsAB is reset to 0 in step 9, and its display is switched to the normal display in step 10. Also switch 5
When the off signal of w5ET is input, the auto bracket mark display disappears in step 30 during the program progressing from step 20 → step 21 → step 30 → step 31, and the step 31 flag FsAB is reset and the auto bracket stage number is reset again. It does not proceed to change mode.

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

[Step 52] Bracket stage number register RGBH
Determine whether the content of
The filming was done twice.

Auto bracketing needs to be prohibited as it is pointless. Therefore, in this case, the process advances to step 53.

[Step 53] A flag FABR indicating auto bracketing mode is reset to O. Also output port PABR
Set the output to °゛0' and turn off the auto bracket mark display.

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

In step 52, if the contents of the bracket stage number In 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 “l”
and display the auto bracket mark. This is because when the switch 5w5ET is turned off by closing the switch cover 6 from the auto flag mode setting state, all the displays are turned off in step 30, so if the first stroke switch swl is turned on, the display will turn on again. This is because it is necessary to do so.

[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 stage number register RGBA are added and stored in the register RGAv again. Also, the contents of the shutter information register RGTv and the contents of the shutter bracket stage number register RGBT are added, and the register RG is added again.
Store it on TV. This means that the aperture information calculated in the shutter priority mode and the shutter speed information calculated in the aperture priority mode are changed in accordance with the number of autobracket stages. In other words, if the autobracketing step number is set so as not to be a negative number at step 49, the value after the calculation at step 56 will be an underexposure value with respect to the standard exposure 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. Switchable auto bracketing is now available.

Further, in step 55, the first stroke switch sw
If l is turned off, the exposure calculation in step 56 is not performed because the metering 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 the auto bracketing mode, if the first stroke switch swl is turned on, exposure 4 with auto bracketing applied, that is, in this example, the underexposure value is displayed, and the metering timer is displayed. P during operation! ? T! The exposure value will be displayed. This makes it possible for the 1M photographer to easily recognize the exposure value of auto bracketing.

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

Since two-bladder photography in bulb photography is basically meaningless, it is more effective to cancel auto bracketing mode. Therefore, if r1 is determined to be the valve mode in step 25, the process advances to step 57.

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

Next, the setting of the multi-hair photography mode will be described.

Switch swM is opened in conjunction with switch A6 being opened.
When the ON signal of E is input, the process proceeds from step 41 to step 2 pro 0.

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

[Step 611 Output ports PTD, PFL.

Set the outputs of PABR, PME, and PFD to "O" and turn off all displays. Next, set the output of only output port PME to "L" and set the multiple shooting mode size on display 5EG4.
to be displayed.

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

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

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

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

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

[Step 66] Add the contents of the multiplexing number register RGMH and the contents of the dial register RGH, and store the result in the register ROMH again. Since the number of times of multiplexing is an integer, if the resolution of one click of the dial 5 is 0.5 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 ROMH for multiple use are output from the output port PFD and displayed on the display 5EH5.

The program then returns to the start. Furthermore, once the ON signal of the switch swME is input, the flag FsME is set to 1 in step 60, so even if the OFF signal of the switch swME is input thereafter, the flag FsME is set to 1 in step 60.
1→Step 42→Step 63, and it becomes impossible to maintain the multiple shooting number setting mode. To shift from the autobladder 2-stage number change mode to the multiplex shooting setting mode, you only need to turn on the switch swME once, and vice versa, you only need to turn on the switch SwABR once, as shown in Figure 7. This is also clear from the flow.

Next, if the number of times of multiplexing is set once and then the number of times of multiplexing is set to zero (0), it is necessary to cancel the multiple photography mode and turn off the multiplex 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 RGMH for the number of multiple shots are zero, the process advances to step 69.

[Step 69] Flag FME indicating multiple shooting mode
Reset to 0. Also, set the output of output port PME to 0°
' to turn off the multiplex 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 PMH to “1”
The frequently used shooting mark will be displayed. This is step 3
Since the display is all turned off at 0, if the first stroke of the release button L is made again, it will turn off! This is to let the photographer know that it is shadow mode.

Did you shoot like above? F! The preparation stage ends.

Next, the sequence after the second stroke of the release button I will be described. When the second stroke of the release button 1 is performed and the on signal (release signal) of the second stroke switch sw2 is input to the input port FAI, the process proceeds from step 11 in FIG. 7 to step 100 in FIG. 9.

[Step 100] It is determined whether the auto bracketing mode is set or not based on the state of the flag FABR. If the auto bracket mode is selected, the process proceeds to step 101; otherwise, the process proceeds to step 102.

[Step 101] The output of the output capo) PFL is set to 1'' and the auto bracket mark on the 1 display 5EG2 is displayed blinking.
You can definitely know that the M shadow has started.

[Step 102] Determine whether or not the ON signal of the self-switch 5ELF has been input to the input boat PA6. If the ON signal has been input, the process goes to Step 103 since the photograph is taken using the self-timer. If not, the process goes to Step 103. Proceed to step 104.

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

[Step 104] Output the contents of the aperture information register RGAy from the output port (PAY). 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 CAW such as a stepping motor.

[Step 105] A pulse signal is output from the output capo PEO, and the transistor TRO is turned on to energize the mirror-up magnet MGO, which is a 1% constant combination magnet.

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

[Step 106] It is determined whether or not the ON signal of the switch sMRUP for detecting the completion of mirror up is input to PA2. Repeat this loop until it is up, and when it is completely up, proceed to step 107.

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

[Step 108] A pulse signal is output from the output port PEI, and the transistor TRI is turned on to energize the shutter front curtain magnet 7) MCI. This causes the shutter front curtain to run.

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

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

[Step 11O] Wait for the off signal of the second stroke switch SW2 to be input. 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 input manually. This is because there is.

[Step Ill] 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,
Output capo) Outputs a pulse signal from PE2.

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

[Step 1131 Input Capo] It is determined whether or not the on signal of the shutter rear curtain switch 5wCN2 is manually inputted to the PA5. Here, the running of the shutter rear curtain is completed until the on signal is input. This loop is repeated until completion, and upon completion, the process proceeds to step 114.

[Step 114] Set the output of the output boat PAY to “°
0'', the aperture 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 hirsute count register RGME and store it in the register RGME again.

[Step 118] It is determined whether the contents of the number of times register RGME are zero. If it is 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 been completed, so the flag FMEt-0 indicating the multiple photography mode is reset. Also, the output of the output boat PME is “Q II
to turn off the multi-hair shooting mark display.

[Step 1201 Start a timer for film feeding. Also, the output of the output boat PB is set to "1", the transistor TR5 is turned on, and the film feeding motor M is turned on.
Rotate B.

If the multiple shooting mode is continued, the contents of the multiplex number register ROMH are not zero, so the process advances from step 118 to step 121, and since step 120 is not passed, film feeding is not performed, so multiple shooting is not performed. It will be done. Further, when the multiple shooting is completed, the contents of the register RGMH become zero, so that the film is fed in the stave 2b 120 after canceling the multiple shooting mode as described above.

[Step 121] Determine whether or not the on signal of the charge completion detection switch swCGE is manually inputted to the FA3 (manual capo).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 has been completed, the output of the output capacitor PD is set to O'' and the power to the charging motor MD is cut off.

[Step 123] It is determined whether or not an on signal has been input to the input boat PA4 for the switch swFLM, which is turned on every time one frame of film has been fed. If not completed, proceed to step 124; if completed, proceed to step 1
Proceed to 25.

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

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

[Step 126] Whether or not the auto bracket mode is set is determined by r1 depending on the state of the flag FABR. If it is not auto bracketing mode, step 132
Yes, if so, proceed to Stave 2 127.

[Step 127] Determine whether or not auto bracket shooting has been performed three times. As mentioned above, auto bracket shooting is shooting that is performed continuously at three levels of exposure: under, standard, and over. 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 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
Similar to step 56 in the figure, the same program can be used for shutter priority, aperture priority, and manual 74 output modes.
In steps 6 and 14, registers RGBA, RG
This is because the contents of BT have been changed. It should be noted that it is clear from this arithmetic expression (subtraction formula) that the second exposure will result in standard exposure, and the third exposure will 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 current time information and aperture value information are displayed.

The program then jumps to NEXT2, step IO4. 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 next photographing starts. Further, even if the m-shadow at this time is in the self-mode, the self-timer is not executed for the second or third time and the next photographing is started.

[Step 130] It is determined whether the off signal of the first stroke switch SW2 is input. If the off signal is not input 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 manually input, the process proceeds to step 131.

[Step 1313: Reset flag FABR indicating auto bracketing mode to 0. Also output boat PF
Set the output of L to "O" and turn off the flashing display of the 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 12B to step 132.

[Step 132] Based on the on/off state of the switch 5wC5 input to the input boat PA7, it is determined whether the mode is a quick-shot mode or a single-shot mode. If the mode is a quick-shot mode, return to the start, and in this case, press the release button L. 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 manually. Since this is a single-shot mode, the next shooting sequence will not proceed unless the photographer stops suppressing the release button L. The OFF signal is input. When it is manually powered, it 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 6"1
'°, transistor TR5 is turned on, and rewind motor MC is rotated. 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 PC to “0゛°
and turns off the transistor TR5 to stop the rewind motor MC. This completes the rewinding of the film.

[Step 155] Flag FABR indicating auto bracket mode is set to O. Matade Capo) P
Set the FL 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 the film ends in the middle even though I'#L must be repeated twice in a row, the routine after step 150 is entered at the 1st or 2nd frame.In such a case,
Continuing auto-bracketing on newly loaded film poses a risk of the subject being different or that the photographer may misunderstand, so the photographer is informed of this and at the same time the auto-bracketing mode is canceled. 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 blinking display of the auto bracketing mark has not been canceled yet.
Therefore, the auto bracketing mark, which would not normally be displayed, is displayed during film rewinding, making it difficult for the photographer to know that the film has ended before auto bracketing has finished completely. You can know. In other words, this is the warning display. Furthermore, since the flag FABR indicating the auto-bracketing mode is reset to O in step 155, the inconvenience of continuing auto-bracketing marks on newly loaded film as in conventional cameras is eliminated.

According to this embodiment, when one shadow of auto bracket shooting is completed, the auto bracket mode is automatically canceled (step 131), and the cancellation can be done by performing the complicated operation procedure as in the past. This eliminates the need to do this, improving operability. Also, the auto bracketing mode is automatically canceled and its display is prohibited (
Step 131) prevents the user from forgetting to cancel the mode and performing the next photograph at the wrong exposure level.

(Effects of the Invention) As explained above, according to the present invention, it is detected that the number of t&l shadows of the counter means has reached a fixed number, and in response to the detection, the auto bracket mode storage of the mode storage means is canceled. Equipped with detection means.

Now, when auto bracket shooting is finished, auto bracket mode is automatically canceled.
It is possible to prevent erroneous auto-bracket photography from being performed and improve operability.

[Brief explanation of drawings]

Fig. 1 is a flowchart showing an embodiment of the present invention, Fig. 2 is a flowchart thereof, and Fig. 3 is a microcomputer installed in a camera incorporating the embodiment shown in Fig. 1. 4 is a front view of the camera, FIG. 5 is a top view, FIG. 6 is a back view, and FIGS. 7 to 9 are flowcharts. l...Release button, 2.3...Operation lever, 4...Exposure mode selection knob, 5...
...Dial, 6...Switch cover, 7...
...Storage section, swABR...Auto bracket switch, swME...Multiple shooting switch,
COM・・・Microcomputer, TD, AD
, FD...decoder, 5EGI~5EG5...
... Display, DIF ... Dial interface circuit, MB, MC, MD ... Motor, 101 ... Auto bracket mode setting means, 102 ... -Mode storage means, 103...
...Auto bracket shooting control child actor, 106...
- Counter means for the number of shots, 107...detection means.

Claims (1)

[Claims] (1) An auto bracket mode setting means for setting the auto bracket mode, a mode storage means for storing the mode setting made by the auto bracket mode setting means, and a mode storage means for automatically changing the exposure value in the auto bracket mode. 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, and 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 in accordance with the above.