JPS6337330A - Exposure control device for camera - Google Patents

Abstract

PURPOSE:To improve the operability, and to prevent wrong auto bracket photographing from being continued, by providing a mode storage means for storing a fact that a mode is set by an auto bracket mode setting means, and releasing an auto bracket mode storage in accordance with the end of a film. CONSTITUTION:When an auto bracket mode is set by an auto bracket setting means 101, a mode storage means 102 stores the auto bracket mode, and also, transfers its fact to an auto bracket photographing control means 103. There after, when a release operation of a release operation means 104 is executed by a photographer, an auto bracket photographing control means 103 controls a diaphragm mechanism and a shutter mechanism, etc., and starts auto bracket photographing. When the first photographing is ended, a charge operation of each mechanism and a winding operation of a film are executed, and subsequent ly, whether the end of the film is detected by a film end detecting means 105 or not is decided. When the film is ended, a signal of its fact is outputted from the film end detecting means 105.

Description

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

The above auto bracketing (more precisely called auto exposure bracketing) refers to the camera's exposure value (in the case of automatic exposure, an exposure control value automatically calculated from the subject brightness and film sensitivity; in the case of manual exposure, This 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 several 8I photographs by changing the exposure value in several stages.

(Background of the Invention) In conventional cameras of this type, if the film runs out during auto-bracketing, the film is rewound and the previous auto-bracketing continues when a new film is inserted. was.

However, the original meaning of auto bracketing is to photograph the same subject at different exposure levels.
If the film ends in the middle, you have to rewind the film and insert a new film, which often causes the subject to change as time passes, resulting in a different shooting result from the original auto bracket shooting. . It's also possible to forget that you're in auto bracketing mode and end up shooting at the wrong exposure level.

(Objective of the Invention) An object of the present invention is to provide an exposure control device for a camera that solves the above-mentioned problems, has good operability, and can prevent erroneous auto-bracketing from continuing. be.

(48 Features of the Invention) In order to achieve the object 1, the present invention provides a mode in which the mode setting by the auto bracketing mode setting means is stored and the auto bracketing mode memory is canceled in response to the end of the film. The camera is equipped with a storage means, so that if the film ends before auto bracketing shooting is completed, the auto bracketing mode is forcibly canceled so that this auto bracketing shooting is not continued. Features.

(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.

Thereafter, when the photographer performs a release operation (second stroke) of the release operation means 104.

The auto-bracket photography control means 103 controls an aperture mechanism, a shutter mechanism, etc., and starts auto-bracket photography. When the first photographing is completed, the respective mechanisms are charged and the film is wound, and then the film end detection means 105 determines whether or not the end of the film has been detected. If the film has ended, a signal to that effect is output from the film end detection means 105, and the auto bracket mode is canceled even if auto bracket shooting has not been completed. Auto bracket shooting will no longer continue.

On the other hand, if the film has not ended, it is then determined whether the auto bracket mode is set. Since auto bracketing mode is set here,
The auto bracket shooting control means 103 automatically changes the exposure value until the detection means 107 detects that the number of auto bracket shots counted by the number of shots counter 106 has reached a predetermined number. Continue continuous shooting. As can be seen from the above, the detection means 107 detects whether or not the number of auto-bracketing shots has reached a predetermined number of times, and when it detects that the number of auto-bracketing shots has reached the predetermined number, it causes the auto-bracketing shooting control means 103 to stop the shooting. In addition to outputting a signal, the mode storage means 102
Outputs a release signal to. As a result, auto-bracketing photography ends and auto-bracketing mode is 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 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. Continue shooting continuously while automatically changing the exposure value until 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. Figure 6 shows the arrangement of each operating member when viewed from the back side.
In Figures 6 to 6, 1 is a release button, 2 is an operating lever for selecting either quick shooting (C) or single shooting (S) shooting mode, 3 is an operating lever for selecting a self-timer, and 4 is a shutter. The exposure mode selection knob selects the exposure mode of priority (Tv), aperture priority (Av), or manual (M). For example, 1f is a so-called electronic dial equipped with 2-bit conductive patterns and brushes with a 90 degree phase difference, which is used to set the information for every 5 steps or 1 step. swM is the aperture value setting. The aperture value can be changed by pressing the switch swM and operating the dial 5 in the manual exposure mode. Reference numeral 6 designates a switch lid of a storage section 7 that stores switches that are used less frequently, swABR represents an auto-bracketing switch that is stored in the storage section 7, and swME represents a multiplex shooting switch that is also stored in the storage section 7. It is.

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

The light receiving element SPC receives reflected light from the subject and outputs the received light signal to a high input impedance wave amplifier OPi having a compression diode D1 connected to a feedback circuit. The operational amplifier OPI outputs logarithmically compressed object brightness information By via the resistor R1. Variable resistor VR1 connected to constant voltage source VGI outputs film sensitivity information Sv. An operational amplifier OP2 having a resistor R2 connected to the feedback circuit calculates and outputs photometric information Ev=(By+Sv). The photometric information Ev is converted into a 4-bit digital value by the A/D converter ADC, and is input to the input port 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 input to the microcomputer COM's input terminals PHO to PG3. be done. The information in the dial interface circuit DIF is reset by inputting a pulse signal from the output port PE3 of the microcomputer COM. 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.
is input to.

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

AD, FD and dial interface circuit DI
A power supply Vbat is supplied to F and the like. Also, the release button l
When the first stroke switch SW1 connected to the input port PAO is turned on by the first stroke, the potential of the output port PF becomes high level, so the transistor TRhat is turned on by the inverter INV and the resistor R3.

The voltage from the electric power XiV bat is supplied as a power supply Vcc to circuits that consume a relatively large amount of power, such as photometric operational amplifiers OPI and OF2.

Microcomputer COM input port PAi-tt
The second stroke switch SW2 is turned on by the second stroke of the release button L, and turned off by raising the mirror.
Mirror up switch sw that turns on when the mirror is down
MRUP, charge completion detection switch swCGE, which turns on when mechanical charging is completed, film l
Film switch s that turns on every time frame feeding is completed
wFLM, trailing curtain switch 5w that 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, a switch 5wC5 that is turned on when continuous shooting mode is selected by the operating lever 5, and turned off when single shooting mode is selected, the aperture value setting switch swM, and the switch 46 are closed. Switch 5w5ET, which is sometimes off and turns on when opened.
The multiplex photography switch swME and the auto bracketing switch swABR are connected to each other.

The bases of transistors TR0-TR2 are connected to the output ports PEO-PE2 via resistors RIO-12, and the transistors TR0-TR2 are connected to the first clamping magnet MG.
It controls the energization of the leading curtain magnet (MCI) that drives the O1 leading curtain and the trailing curtain magnet (MC2) that drives the trailing curtain. Also, resistor R13 is connected to output ports PD, PC, and FB.
The bases of transistors TR3 to TR5 are connected through transistors TR3 to TR5, transistor TR3 drives charging motor MD, transistor TR4 drives rewinding motor MC, and transistor TR5 winds the film at high speed. The drive of each motor MD is controlled respectively.

From the output port PTD, the contents of the shutter speed information register RGTv in the microcomputer C0M are output to the decoder TD, and the decoder TD converts the contents into a signal for displaying the speed sensor time, and the decoder TD converts the contents into a signal for displaying the shutter speed time, and the decoder TD converts the contents into a signal for displaying the shutter speed time. The signal is output to the displayed display 5EG1.

"'l" (means high level) or 'o' (means low level) from output port PFL, PABR
If a signal of "1" is output from the decoder AD, and a signal of "1" is input from the output capo (PFL), the decoder AD
The connected display 5EG2, which is composed of a liquid crystal, etc., outputs a signal for displaying a bracket mark point reduction. When the signal "I11" is input from the output port PABR, a signal for displaying the top bracket mark is output to the display 5EG2.

From the output port PME, a signal of °゛l°゛ or "0゛° is output to the display 5EG4 composed of a liquid crystal etc., and the display 5EG4 performs multiple shooting when a signal of "1'" is input. Displays a mark.

From the output port PFD, the microcomputer C0M
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 RGME 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 port PAV, the contents of the aperture value information register RGAv in the microcomputer C0M are output to the aperture control drive circuit DAY. The aperture control drive circuit DAV is connected to the drive actuator CAV.
For example, the information converted into actual aperture information is output to a stepping motor or the like, and this is driven to perform appropriate aperture control.

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

When the battery DAT is loaded into the camera and the power supply Vbat is generated, the microcomputer COM starts the operation 1511 from the start of the flowchart in FIG.

[Step 1: Suppose the photographer only makes the first stroke of release button 1, and the first stroke switch s
When the wl ON signal is input to the input port PAO, the process proceeds to step 2.

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

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

[Step 4] It is determined whether the shutter priority mode is set based on the input states of the input ports PPO and 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 C0M are held while the battery BAT is loaded. Also, if you load the battery BAT for the first time,
It is assumed that a frequently used value, for example, information such as 1/125 seconds is initially set.

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

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

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

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

[Step 9] Auto bracket switch 5WAB
A flag FsAB indicating whether R has been operated is reset to 0. Also, a flag FsME indicating whether or not the multiplexing 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 11] The second stroke of the release button 1 is performed, and the on signal of the second stroke switch SW2 is determined to determine whether or not the on signal of the second stroke switch SW2 is input to the input capo PAL. If it is not input, return to the start. Also, while the ON signal of the first stroke switch swl is being input, subject moderation 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] The contents of the register RGAv, which stores the information set by the operation of the dial 5 and the aperture value setting switch swM, are subtracted from the contents of the register RGEv, and the result is added to the shutter information register RGTv.
to be memorized.

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

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

Thereafter, in the aperture priority mode, the same sequence as in the shutter priority mode is performed, and the aperture value set in step 1O is displayed on the display 5EG5, and the shutter speed calculated by the calculation is displayed on the display 5EGl, respectively. Is displayed.

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

[Step 15] The contents of the register RGTM storing the shutter speed information set by operating the dial 5 are stored in the shutter information register RGTv.

This is because when auto-bracketing shooting is set in manual exposure mode, the contents of register RGTv change each time a shot is taken, so the information set by operating dial 5 is stored as is. Details will be explained later. do.

After that, the same sequence as in the aperture priority mode is followed, and the aperture value set in step IO 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 swf is 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 boat PA
Since the off signal of switch 5w5ET is input to 9,
Proceed to step 21.

[Step 21] It is determined whether or not the photometry 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 input ports ppo and ppt. If the shutter priority mode is currently set, the process advances to step 23.

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

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

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

[Step 82] Return to the original step.

Returning again to the flowchart -) in FIG.

[Step 24] Ia set by dial operation
(/i (contents of register RGH) and shutter information (contents of register RGTv) are added 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 a certain code indicating a valve mode located next to the longest second of the shutter speed is stored in the register RGTM. If you are not in valve mode now, go to NEXTl, that is, stay,
Jump to step 3.

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 shutter speed time are displayed on the display 5EGI in step IO.
5EG5, respectively.

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 shutter speed can be displayed on the displays 5EGI and 5EG5 in step 10, as in the case of the shutter speed priority mode.

If the manual exposure mode has been set, the process proceeds to step 22 -> step 26 -> step 29.

[Step 29] It is determined whether the aperture value setting switch swM is on or off. In manual exposure mode, the aperture value can be changed by operating the aperture value setting switch swM and dial operation, and the shutter speed can be changed by operating only the dial. When the switch swM is on, the process proceeds to the same routine (step 27) as in the aperture priority mode, and when it is off, the process proceeds to the same routine as in the shutter priority mode (step 23).

When a predetermined period of time elapses after the suppression operation of the release button 1 is stopped, the Jllll optical timer operation ends.

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

[Step 30] Output boat PTD, PFL.

Set the outputs of PABR, PME, and PFD to "o",
All the displays W S E G 1 to S E G 5 (however, the display 5 EG2 does not exist) are turned off. Further, the output of the output port PF is set to "O", the transistor TRbat is turned off, and the supply of the power supply Vcc is stopped.

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

The program then jumps to the start.

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

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

[Step 40] Auto bracket switch SwA
BR is determined. Since the switch lid 6 has just been opened and the auto bracket switch 5WABR has not been operated, the process advances to step 41.

[Step 41] The multiplex photographing 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. When the battery BAT is in the initial loading state and the first stroke switch swl is on, the flag FsME is reset to O in step 9, so step 4
Proceed to step 3.

[Step 43] Auto bracket switch SwA
Flag FsAB indicating whether BR suppression operation has been performed
Make a determination. As in step 42, step 9
Since the flag FsME is reset to 0,
Step 21 Hejump.

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 will be described in which the pressing operation of R is performed once. When the auto bracket switch s wABR is suppressed, an on signal is input to the input port PAll. The program then proceeds from step 40 to step 44.

[Step 44] It is determined whether the contents of the register RGTM indicate the valve mode. If it is in valve mode, it will return to the start and will not enter auto bracket mode.

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

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

[Step 46] Output boat PTD, PFL.

Set the outputs of PABR, PME, and PFD to "0".

All the displays on the displays 5EGI to 5EG5 are turned off. Next, only the output of output port PABR is set to “lo”.

and the auto bracket mark on the display 5EG3 lights up. This allows the photographer to clearly know that the auto bracketing mode has been set.

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

[Step 48] Similar to step 23 or step 27, an information reading routine associated with the operation of the dial 5 is executed. In this case, in step 80, for example, if the stage number information 0,5 is set by the dial 5, the stage 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 the number of stops of 5, 0, 0, 5J means an exposure value that is -0.5 steps under the standard exposure value calculated by calculation, a standard exposure value, or 0 to the standard exposure value. This means that images are taken consecutively at three levels of exposure value: .5 levels overexposure value.

[Step 49] Bracket stage number register RG
Add the contents of BH and the contents of the dial, and register R again.
Store it in GBH. As mentioned above, the minimum resolution by one crank of the dial 5 can be set freely in every 0.5 step or in every 1 step. Note that if the resolution differs from that of the shutter speed and aperture value, a program that multiplies the contents of the register RGBH by an integral number may be inserted, and since this is not related to the water chamber, a detailed explanation will be omitted here. Further, the contents of the register RGBH are outputted from the output port PFD, and numerical values indicating the number of stages, such as ro and 5J, are displayed on the display 5EG5. Note that the decoder FD and display 5EG5 used at this time also serve as an aperture display.
The decoding of the aperture value is based on the F-number number rather than the apex value Ay, and the decoding of auto bracketing is, for example, a value 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, and 0.5 stop σ, there are 14 types in total, and 14 types in total. Bracket display is 0.5 from 0 to 5
For each stage, there are 11 types in total, 30 types in total, and 31 types when blank codes are included.By adding a certain constant when sending data to the output PFD, the decoder FD determines which information it is. This makes it possible to distinguish and display appropriate numerical values.

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

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

The auto bracket stage number changing mode can be canceled by turning on the first stroke switch swl, or by closing the switch lid 6 and turning off the switch 5w5ET. In other words, when the ON signal of the first stroke switch swl is input, the program progresses in the order of step 1 → step 2 → step 3 →..., and the flag FsAB is reset to O in step 9, and its display is also In step 10, normal display is performed. Also switch 5w5ET
When the OFF signal is input, the auto bracket mark display disappears at step 30, and the step 31 flag FsAB is reset, and the auto bracket starts again in the process of the program proceeding from step 2o → step 21 → step 30 → step 31. It does not proceed to stage number 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.

There is a change of heart that prohibits auto bracket photography because it is pointless. Therefore, in this case, the process advances to step 53.

[Step 53] The flag indicating auto bracketing mode is reset to FABRt-0. Also output boat PA
Set the BR output to °“Ooo and turn off the auto bracket mark display.

Next, by proceeding to step 8, the exposure calculation of the Oud Placent is not performed, the flag FsAB is reset to 0, and the normal routine is executed.

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

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

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

[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 exposure value on the under side of 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. Auto-bracketing photography is now possible.

Further, in step 55, the first stroke switch sw
If it is determined that l is off, the exposure calculation in step 56 is not performed because the photometry timer is operating.
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 underexposure value in this example, is displayed, and the metering timer is activated. The standard exposure value will be displayed inside. This allows the photographer to easily recognize the exposure value of auto bracketing.

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

Bracketing in bulb photography is ultimately pointless, so it is more effective to cancel auto bracketing mode. Therefore, if it is determined in step 25 that the mode is bulb photography, the process proceeds to step 57.

[Step 57] Set the output of 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 6, switch s w
When the ME ON signal is input, the process proceeds from step 41 to step 60.

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

[Step 61] Output boat PTD, PFL.

Set the output of PABR, PME, and PFD to °°0'°,
All displays are turned off, the output of only the 0th order output capo-h PME is set to °゛l゛°, and the multiplex photography mode mark is displayed on the display 5EG4.

[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 2 Pro 4] Since the mode is auto bracketing, the number of multiple shots is forcibly set to three, as in step 51, that is, the content of the register RGMH for the number of multiple shots is 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 ROME and the contents of the dial register RGH, and store the result in the register RGMH again. Since the number of times of multiplexing is an integer, if the 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 multiple-sheet state register RGMH are output from the output capo PFD and displayed on the display 5EH5.

The program then returns to the start. Moreover, once the on signal of the switch s w M E is input, step 6
Since the flag FsME is set to 1 in step 0, even if the switch swME off signal is input thereafter, the process proceeds from step 41 to step 42 to step 63, making it possible to maintain the multiple shooting number setting mode. . The flow in Figure 7 shows that to shift from the auto bracketing step number change mode to the multiplex shooting setting mode, you only need to turn on the switch swME once, and to switch vice versa, you only need to turn on the switch swABR once. It is also clear from

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

[Step 69] Flag FME indicating multiple shooting mode
Reset to 0. Also, the output of the output boat PME is
Set it to 0° and turn off the multiple shooting mark display.

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

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

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

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 PA1, the process proceeds from step 11 in FIG. 7 to step 100 in FIG. 9.

[Step 100] It is determined whether the OI bracket mode is set or not based on the state of the flag FABR. Step 101 if in auto bracket mode
If not, proceed to step 102.

[Step 101] Set the output of the output boat PFL to “°
l'', and the auto bracket mark on the display 5EG2 is displayed blinking. This allows the photographer to reliably know that auto bracket photography has started.

[Step 102] Determine whether or not the ON signal of the self-switch 5ELF is input to the PA 6 (input camera). If the ON signal is input, it is self-timer photography, so proceed to Step 103; otherwise, proceed to Step 103. If so, proceed to step 104.

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

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

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

[Step 105] A pulse signal is output from the output boat PEO, and the transistor TRO is turned on to energize the 174th 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, it is determined whether or not the on signal of the switch swMRUP, which detects the completion of mirror up, is input.Here, it is determined that the on signal is input until the on signal is input, that is, the mirror is completely raised. This loop is repeated until the image is completely uploaded, and the process proceeds to step 107.

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

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

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

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

[Step 110] 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. This is because there is.

[Step tilF Because it is not in valve mode.

In step 107, a real time count is performed using the expanded data, and the calculated shirt time is measured.

[Step 112] When the real time count ends,
Output a pulse signal from PE2 (output capo), turn on transistor TR2, and turn on the shutter rear curtain magnet (MG2).
energize. This causes the shutter trailing curtain to run.

[Step 113] Input Capo) It is determined whether or not the ON signal of the shutter rear curtain switch 5wCN2 is input to PA5.Here, the operation of the shutter rear curtain is completed until the ON signal is input. This loop is repeated until the process is completed, and upon completion, the process proceeds to step 114.

[Step 114] Output ``PAY''
o”, thereby returning the diaphragm to the open state!E.

[Step 115] Set the output of the output port PD to "1"
", turns on the transistor TR3, and rotates 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 jG of the flag FMH. If it is the multiple shooting mode, the process proceeds to step 117; otherwise, the process proceeds to step 120.

[Step 117] Subtract 1 from the contents of the multiplexing number register RGME and store it in the register ROMH again.

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

[Step 119] Since the content of the multiplexing number register RGME is O, it means that multiplex photography has ended, so the flag FME indicating the multiplex photography mode is reset to O. Also, the output of the output port PME is set to OFF, and the multiple shooting mark display is turned off.

[Step 120] Start a timer for film feeding. Also, output from output port PB.

1'', the transistor TR5 is turned on, and the film feeding motor MB is rotated.

If the multiplex 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, no film feeding is performed. Therefore, multiple photography is performed. Furthermore, when the multiplex photography is completed, the contents of the register RGME become zero, so the film is fed in step 120 after the multiplex photography mode is canceled as described above.

[Step 1211 It is determined whether the ON signal of the charging completion detection switch swCGH is input to the human-powered boat PA3. On signal is not input,
In other words, if charging is not completed, the process proceeds to step 123, and if charging is completed, the process proceeds to step 122.

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

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

[Step 124] Determine the state of the film feeding timer. When the film is finished, no further film feeding is possible, so the switch swFLM is never turned on, and in such a case, the timer for film feeding, which is, for example, a one-second timer, finishes counting. When the time measurement is completed, 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 port PB is set to 0°, the transistor TR5 is turned off, and the film feeding motor MB is stopped.

[Step 126] It is determined whether the auto bracket mode is set or not based on the state of the flag FABR yn1. Step 1 if not in auto bracketing mode
If yes, proceed to step 127.

[Step 127] It is determined whether auto bracket photography has been performed three times. As described above, auto bracket photography is photography that is performed continuously at three levels of exposure values: underexposure, exposure, and overexposure, so if the three exposures are not completed, the process proceeds to step 128.

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

Also, the contents of the shirt tabular/seat stage number register GRBT are subtracted from the contents of the shank second time information register RGTv, and the result is stored in the register RGTv again. Here, as in step 56 of FIG. 7, shutter priority, aperture priority,
The same program can be used even in manual exposure mode.
In steps 6 and 14, registers RGBA, RG
This is because the contents of BT have been changed. It is clear from this arithmetic expression (subtraction formula) that the second shooting will result in standard exposure, and the third shooting will result in overexposure.

[Step 129] The contents of the registers RGAv 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 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 underexposure value of 1] was seen in the discrimination display in step 55, all exposure displays of the underexposure value, standard 1 value, and overexposure value during auto bracket shooting are displayed in the shooting sequence. It is possible to check with. 1st stroke switch sw2
When the off signal is input, the process advances to step 131.

[Step 131] A flag FABR indicating auto bracketing mode is reset to 0. Also output boat P
Turn the FL output to °゛OO and turn off the flashing auto bracket mark.

The program then returns to start and enters standby mode.

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

[Step 132] Based on the on/off status yE of the switch 5wC5 input to the input boat PA7, it is determined whether the mode is continuous shooting mode or single shooting mode.If it is the quick shooting mode, return to the start, and in this case, press the release button l. The first suppression operation is performed. 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] i1 stroke switch SW2
Since this is a single-shot mode in which the camera waits for an off signal to be input, it will not proceed to the next shooting sequence unless the photographer stops pressing the release button 1. When the off signal is input, the process returns to the start.

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

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

[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 you will see from here on, step 152. The process proceeds through the loop of step 153, and when the completion of feeding of one frame is detected, the process proceeds from step 152 to step 151, and this loop is repeated when the film is rewound. After that, when all the films are wound up in the cartridge, for example, the cartridge stops rotating and the state of the film switch swFLM no longer changes. If this is detected, the process proceeds to step 154.

[Step 154] Set the output of the output boat PC to °°0°
°, transistor TR5 is turned off, and rewind motor MC is stopped. This completes the rewinding of the film.

[Step 155] A flag FABR indicating auto bracketing mode is reset to O. Also output boat PF
Set the L output to 0° and turn off the flashing auto bracket mark.

The program then returns to the start.

Also, during auto bracket shooting, in other words,
If you have to take a series of shots, but the film runs out midway through, step 1 after the 1st or 2nd frame.
In such a case, if you enter the routine after 50,
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. It is desirable to do so. 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 rewinding is being executed, the flashing display of the auto bracket mark has not yet been canceled.

Therefore, the auto bracketing mark, which would not normally be displayed, is displayed during film rewinding, making it easy for the photographer to understand that the film has ended before auto bracketing has finished completely. can be known. In other words, this is the warning display. Also, step 155
Since the flag FABR indicating the auto-bracketing mode is reset to 0, the inconvenience of continuing auto-bracketing on newly loaded film as in conventional cameras is eliminated.

According to this embodiment, if the film ends before auto-bracketing is completed, the auto-bracketing mode is forcibly canceled (step 155).
), it is no longer necessary to continue auto-bracketing, which is likely to have different subject conditions for new film. Additionally, if the film runs out before auto bracketing 1sugi is completed, auto bracketing mode is automatically canceled, eliminating the risk of shooting with incorrect exposure, and eliminating the risk of shooting with incorrect exposure. Since there is no need to cancel this mode through complicated operating procedures in certain cases, the camera is easy to operate.

(Effects of the Invention) As described above, according to the present invention, the mode storage means memorizes that the mode has been set by the auto-bracketing mode setting means and cancels the auto-bracketing mode note tα in response to the end of the film. If the film ends before auto-bracketing is completed, the auto-bracketing mode is forcibly canceled and the auto-bracketing mode is prevented from continuing. In addition, it is possible to prevent erroneous auto-bracketing from continuing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a flowchart 1. FIG. 3 is a circuit diagram showing a microcomputer and peripheral circuits disposed in a camera incorporating the embodiment shown in FIG.
The figure is a front view of the camera, Figure 5 is a top view, and Figure 6 is a top view.
The figure is also 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, A
D, FD...decoder, 5EGI~5EG5
...Display device, DIF...Dial interface circuit, MB, MC, MD...Motor, 101...Auto bracket mode setting means, 102... ...Mode storage means, 103...
. . . Auto bracket shooting control means, 106 . . .
...Counter for the number of shots, 107...Detection means.

Claims (1)

[Claims] (1) Auto bracket shooting control means that automatically changes the exposure value and performs multiple shootings during auto bracket mode, auto bracket mode setting means that sets the auto bracket mode, and the auto bracket mode setting An exposure control device for a camera, comprising mode storage means for storing the mode setting made by the means and for canceling the auto-bracketing mode storage in response to the end of the film.