JPS6337334A - Exposure control device for camera - Google Patents

Abstract

PURPOSE:To exactly inform a fact that photographing is being executed, by providing a display means for executing the display of autobracket photographing, by a display form being different from that of an autobracket mode display, until a detection by a detecting means is executed, after the time point when autobracket photographing is started by an autobracket photographing control means. CONSTITUTION:When an autobracket mode is set by an autobracket setting means 101, a mode storage means 102 stores an autobracket mode, and also, transmits its fact to an autobracket photographing control means 103. Also, in such case, the mark display of a fact being in an auto bracketmode set state is executed by a display means 104. When the release operation of a release operating means 105 is executed, whether the autobracket mode is set or not is discriminated, and when the autobracket mode is set, a flickering display instruction is executed to a display means 104. In such way, in the display means 104, a flickering display for showing a fact that autobracket photographing is being executed is displayed, in addition to said autobracket mode display.

Description

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

Note that the auto bracketing (more precisely called auto exposure bracketing) refers to the camera's exposure value (in the case of automatic exposure, the exposure control value is automatically calculated from the subject brightness and film sensitivity, and in the case of manual exposure, This refers to the offset of the camera with respect to the shutter speed and aperture value set by the photographer.Simply put, when photographing a certain subject, the exposure value is changed to several levels and a number of #1 photos are taken. This means that the camera automatically takes a picture of.

(Background of the invention) During the auto-bracketing shooting sequence, shutter control and film advance control are basically performed, and since there is not much difference between these and normal single-frame shooting, auto-bracketing mode There is a danger that you will forget that you are taking a picture, and you may perform the wrong operation. Therefore, it is desirable to notify the user by some method while auto-bracketing photography is in progress.

(Object 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 and can reliably notify a photographer that auto-bracket photography is in progress.

(Features of the Invention) In order to achieve the above object, the present invention displays that the auto bracketing mode is set, and detects the auto bracketing mode by the detection means from the time when the auto bracketing shooting control means starts auto bracketing shooting. Until then,
The present invention is characterized by comprising a display means for displaying that auto-bracket photography is being performed in a display format different from the auto-bracket mode display.

(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.

After that, when the photographer performs the release operation (second stroke) of the release operation means 105, it is determined whether or not the auto bracket mode is set, and if the auto bracket mode is set, the display means A blinking display instruction is given to 104. As a result, in addition to the auto-bracketing mode display, the display means 104 displays a blinking display indicating that auto-bracketing photography is in progress. Further, the auto-bracket photography control means 103 controls the aperture mechanism, shutter mechanism, etc., and starts auto-bracket photography. When the first auto bracket shooting is completed,
A charging operation of each of the mechanisms and the like is performed, and then a determination is made again as to whether or not the auto bracketing mode is set.

Since the auto bracketing mode is set here, the auto bracketing shooting control means 103 detects by the detection means 107 that the number of auto bracketing shots counted by the shooting number counter 106 has reached a predetermined number. Continuous shooting continues while automatically changing the exposure value until 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.
3, and outputs a stop signal to the mode storage means 1.
Outputs a release signal to 02. As a result, auto bracket shooting ends and auto bracket/ ) mode is canceled. Furthermore, by canceling the auto bracketing mode, the displaying of the auto bracketing mode on the display means 104 and the flashing display indicating that auto bracketing is in progress are prohibited.

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 operating lever for selecting the shooting mode of rapid shooting (C) or single shooting (S), 3 is the operating lever for selecting the self-timer, and 4 is the shutter. The exposure mode selection knob selects the exposure mode of priority (Tv), aperture priority (Ay), or manual (M). For example, the so-called electronic dial is equipped with 2-bit conductive patterns and brushes that are 90 degrees out of phase with each other, and is used to set the information for every 5 steps or 1 step. swM is the switch for setting the aperture value. In manual exposure mode, the aperture value can be changed by pressing the switch swM and operating the dial 5. Reference numeral 6 designates a switch lid of a storage section 7 that stores switches that are used less frequently, swABR represents an auto-bracketing switch that is stored in the storage section 7, and swME represents a multiplex shooting switch that is also stored in the storage section 7. It is.

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

The light-receiving element SPC receives reflected light from the subject and outputs a light-receiving signal to a high input impedance operational amplifier OPi whose feedback circuit is connected to a compression diode D1. The operational amplifier OPI outputs logarithmically compressed object brightness information By via the resistor R1. Variable resistor VR1 connected to constant voltage source VGI outputs film sensitivity information Sv. An operational amplifier OP2 whose feedback circuit is connected to a resistor R2 calculates and outputs photometric information Ev=(By+Sv). The photometric information Ev is converted into a 4-bit digital value by the A/D converter ADC, and is input to the input capacitor (PGONPG3) 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 input ports PH0-PC3 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, two series of exposure mode switches 5WSE'L are turned on and off, and 2-bit information corresponding to the selected exposure mode is input to the microcomputer COM.) Pro-P
Input to PI.

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

AD, FD and dial interface circuit DI
A power supply Vbat is supplied to F and the like. Also, the release button l
When the first stroke switch SW1 connected to the input capacitor (PAO) is turned on by the first stroke of The voltage from Vbat is supplied as a power supply Vcc to circuits that consume a relatively large amount of power, such as photometric operational amplifiers OPI and OF2.

Microcomputer COM input capo) FA1-11
The second stroke switch SW2 is turned on by the second stroke of the release button L, and turned off by raising the mirror.
Mirror up switch swM that turns on when the mirror is down
RUP, a charging completion detection switch swCGE that turns on when mechanical charging is completed, and a film switch sw that turns on every time the feeding of one frame of film is completed.
FLM, trailing curtain switch 5wC that turns on when trailing curtain travel is completed
N2, a self-switch 5w5EL that is turned on when the self-timer is set by the operating lever 3;
F, a switch 5wC5 that is turned on when, for example, the quick-shooting mode is selected by the operation lever 5, and turned off when the single-shot mode is selected; the aperture value setting switch swM; when the switch lid 6 is closed; The switch 5w5ET, which is turned off and turned on when opened, the multiplex photographing switch swME, and the auto-bracketing switch swABR are connected, respectively.

The bases of transistors TRO-TR2 are connected to the output ports PE0-PE2 via resistors RIO-12, and the transistors TR0-TR2 are connected to the first clamping magnet (MG).
Controls the energization of the leading curtain magnet (MCI) that causes the O1 leading curtain to run, and the trailing curtain magnet MG2 that drives the trailing curtain, respectively. Also, resistor R13 is installed on the output boat FD, 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 respective drives of the winding motors MD are controlled.

From the output port PTD, the contents of the shutter speed information register RGTv in the microcomputer 00M are output to the decoder TD, and the decoder TD converts the contents into a signal for displaying the shutter speed seconds and displays it on the connected liquid crystal, etc. The signal is output to the configured display device 5EG1.

Output ports PFL and PABR output signals of "l" (meaning high level) or "0" (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. When a signal of "°1" is input from the output (output capo) PABR, a signal for displaying the top bracket mark is outputted to the display 5EG2.

A signal of 1'' or O'' is output from the output port PME to the display 5EG4, which is composed of a liquid crystal, etc.
4 displays a multiple shooting mark when a signal of "1'° is input.

From the output port PFD, the microcomputer 200M
The contents of the aperture value information register RGAv, the contents of the auto bracketing step information register RGBR, or the contents of the multiplex number information register ROMH are 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.

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

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

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

[Step 1] Suppose that 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 the “loo” signal from the output port PF, turn on the transistor TRbat, and turn on the power supply Vc.
Then, the photometry timer is started. The photometry timer is the first stroke switch sw
This is to keep the power supply Vcc continuously supplied for a predetermined period of time from the input of the OFF signal in step 1.

This allows the photographer to check the photometry status for a predetermined period of time even after releasing the release button 1, and to change the setting information while viewing the display using the exposure mode selection knob 4. 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 ppt. If the shutter priority mode is currently set, the process proceeds to step 5.

[Step 5] Subtract the contents of the shutter information register RGTv, which stores information set by operating the dial 5, from the contents of the register RGEv, and store the result (aperture information Av) in the aperture information register RGAv. let It is assumed that the contents of all registers in the microcomputer 200M are held while the 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 17125 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 FABH 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 the multiplex photographing switch swME has been operated is reset to O.

[Step 10] The contents of the aperture information register RGAv are output from the output register PFD, and the contents of the shutter information register RGTv are output from the output register 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 5EG1.

[Step 11] The second stroke of the release button 1 is performed, and it is determined whether the on signal of the second stroke switch sw2 is input to the input port PAL.
Assuming that the on signal of the younger 2-stroke switch SW2 is not input, the process returns to the start. Further, while the ON signal of the first stroke switch swl is being 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] Subtract the contents of the register RGAv, which stores the information set by the operation of the dial 5 and the aperture value setting switch swM, from the contents of the register RGEv, and the result is stored in the shutter information register RGT.
Store it in v.

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

[Step 14] The contents of the bracket stage number register RGBR, 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 10 is displayed on the display 5EG5, and the shutter speed calculated by the calculation is displayed on the display 5EG1. Is displayed.

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

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

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

After that, the same sequence as in the aperture priority mode is followed, and the aperture value set in step 10 is displayed on the display 5EG5.
The set shirt time is displayed on the display 5EGI.

Next, we will describe information setting by dial operation while the photometry timer is operating. When the pressing of the release button 1 (first stroke) is stopped during the above-described sequence, an off signal of the first stroke switch swl 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 cover 6 remains closed, the input capo) PA
Since the off signal of switch 5w5ET is input to 9,
Proceed to step 21.

[Step 21] It is determined whether the photometry timer is in operation or not. Since the photometry timer has just 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 PPI. If the shutter priority mode is currently set, the process advances to step 23.

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

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

[Step 81] Output a pulse signal from output port 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] It is determined whether or not a certain code indicating the valve mode located next to the longest second of the shutter speed is stored in the register RGTM.If it is not currently the valve mode, go to NEXTl, that is, step 3
Hejiyanpsul.

In this way, during the photometry timer after the press of the release button L (first stroke) is stopped, the setting information can be changed by operating the dial 5, and then the routine from step 3 described above is executed. In step 10, the aperture value and shutter speed are displayed on the display 5EGI.
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 program jumps to TI, that is, step 3, and in step 10, the aperture value and shutter speed can be displayed on the displays 5EG1, 5EG5, respectively, as in the shutter speed priority mode.

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

[Step 29] 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 seconds and hours can be changed, when the switch swM is on, the process proceeds to the same routine (step 27) as in the aperture priority mode, and when it is off, the shutter priority mode is executed. The program then proceeds to execute the same routine (step 23).

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

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

[Step 30] Output port PTD, PFL.

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

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

The program then jumps to the start.

Therefore, after the photometry timer ends, step 1 → step 2
The 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 port 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 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 indicating whether or not the multiple shooting switch swME has been pressed is determined. In the initial state of loading the battery BAT and the first stroke switch swl being on, the flag Fs is set in step 9.
Since ME has been reset to O, the process advances to step 43.

[Step 43] Auto bracket switch SwA
Flag FsAB indicating whether or not a BR pressing operation has been performed
Make a determination. As in step 42, step 9
Since the flag FsME is reset to O,
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 swABR is pressed, an on signal is input to the input capo (PAIL). The program then proceeds from step 40 to step 44.

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

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

[Step 45] Auto bracket switch 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 output of PABR, PME, and PFD to “0”.

All the displays on the displays 5EGI to 5EG5 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.Thereby, the photographer can 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 Three preset auto-bracket photographs will be performed in which the exposure is automatically changed in steps of -1, 0, and IJ. In addition, the above-mentioned ro.

Shooting with 5.0 and 0.5J steps means an exposure value that is -0.5 steps under the standard exposure value calculated by calculation, a standard exposure value, and 0 to the standard exposure value. .5
This means that photography is performed continuously using three levels of exposure values, including exposure values that are one step over.

[Step 49] Bracket stage number register RGBH
Add the contents of and the contents of the dial, and register RGB again.
Let H memorize it. As mentioned above, the minimum resolution by one click of the dial 5 can be set freely in increments of 0.5 steps or in increments of 1 step. Note that if the resolution is different from the shutter speed and the aperture value, a program that multiplies the contents of the register RGBH by an integer may be inserted, and a detailed explanation will be omitted here since it is not related to the actual situation. Further, the contents of the register RGBH are output from the output port PFD, and the display 5EG5 displays a numerical value indicating the number of stages, for example rO, 5J. In addition, the decoder FD and display unit 5 used at this time
EG5 also serves as an aperture display, and the aperture value is decoded from the apex value Av to the F number number.
Auto bracket decoding is, for example, a value every 0.5 steps, so it is necessary to change the decoded content, but if the output from the PFD is 5 bits, 32 types of data are sent. Therefore, if the aperture value is displayed every 0.5 stops from Fl, 4 to F32, the total is 14.
If the type, auto flag -/) is displayed every 0.5 steps from O to 5, there are 11 types in total, 30 types in total, and 31 types if you include a blank code.When sending data to the output capo-) PFD. By adding a certain constant, the decoder F
It is possible to determine which information D belongs to, and it is possible to 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 multiple shots to "3". This is because the number of auto bracket shots is predetermined to be three, so even if the number of times for multiple shots is set arbitrarily, it is mandatory. The program returns to the start in order to prevent the photographer from making operational mistakes and to eliminate the risk of erroneous exposure. Furthermore, once the on signal of the switch 5WABR is input, the flag FsAB is set to 1 in step 45, so even if the swABR off signal is input, the program continues from step 40 → step 41 → step 42. →Step 4
3→Step 48, the auto-bracketing step number change mode can be maintained using the dial 5, and the photographer can operate the dial 5 while stopping the pressing operation of the switch swABR.

To cancel the auto bracket stage number change mode, turn on the first stroke switch swl.

Alternatively, this can be done 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 →...
The flag FsAB is reset to O in step 9, and its display is also switched to a normal display in step 10. Further, when the off signal of switch 5w5ET is input, step 2
In the process of the program proceeding from 0 to step 21 to step 30 to step 31, the auto bracket mark display disappears at step 30, and the step 31 flag FsAB
will be reset and will not proceed to auto bracket stage number change mode again.

Next, exposure calculation in auto bracketing mode will be explained. In the case of shutter priority mode, the contents of the bracket stage number register RGBH are stored in the aperture bracket stage number register RGBA as described in step 6, and in the case of shutter priority mode and manual exposure mode, the contents of the bracket stage number register RGBH are stored in step 14.
As mentioned above, the shutter bracket stage number register RGB
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
Since multiple shots are taken, it is meaningless, so it is necessary to prohibit auto bracket shooting. Therefore, in this case, the process advances to step 53.

[Step 53] A flag FABR indicating auto bracketing mode is reset to 0. Matade Capo) PAB
Set the R output to 0°° and turn off the auto bracket mark display.

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

In step 52, if the contents of the bracket stage number register RGBH are not zero, it is necessary to perform exposure calculation and display of the auto bracket mark using the stage number information, so the process proceeds to step 54.

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

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

[Step 56: Add the contents of the aperture information register RGAv and the contents of the aperture bracket stage number register RGBA, and store the result 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, since the first stroke of the release button 1 is always made when shooting, step 56 is always passed.
Therefore, there is no problem with auto bracketing photography.

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

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

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

[Stellab 57] Output capo) PABR output II
” to turn off the auto bracket mark display.

Also, reset the auto bracket mode flag FABR to O.

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

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

[Step 601: Set the flag FsME to 1, which indicates that the multiplex photographing switch swME is turned on. Also, a flag FsAB indicating that the auto bracket switch swABR is turned on is reset to O.

[Step 61] Output port PTD, PFL.

Set the outputs of PABR, PME, and PFD to "0'°, and turn off all displays. 6. Next, set the output of only the output boat PME to "1°, and set the multiple shooting mode mark to display 5E.
Display it on G4.

[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 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 same month register RGMH are output from the output capo PFD and displayed on the display 5EH5.

The program then returns to the start. Furthermore, once the ON signal of the switch swME is input, the flag FsME is set to 1 in step 60, so even if the OFF signal of the switch swME is input thereafter, the flag FsME is set to 1 in step 60.
1→Step 42→Step 63, and it becomes possible to maintain the multiple shooting number setting mode. The graph in Figure 7 shows that the transition from the auto bracketing step number change mode to the multiplex shooting setting mode can be achieved by turning on the switch swME once, and vice versa by turning on the switch swABR once. , which is also clear from Law.

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 O. Also output capo) PMH output “°
Set it to 0 and turn off the multiple shooting mark display.

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

[Step 70] Increase the PMH output to 1'°
The multiple shooting mark will be displayed. This is step 3
This is to notify the photographer that the multiple shooting mode is in effect when the first stroke of the release button 1 is made again since all the displays are turned off at 0.

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

Next, the sequence after the second stroke of the release button 1 is performed 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 capo FAI, the process advances 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] Set the output of the output boat PFL to “1”
Then, 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 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] The contents of the aperture information register RGAv are output from the output boat PAV. As a result, the aperture control drive circuit DAV converts the contents of the register RGAv into actual aperture information, and starts aperture control via the aperture drive actuator CAV such as a stepping motor.

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

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

[Step 1061 Determine 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, until the on signal is input, that is, until the mirror is completely raised. This loop is repeated, and when the image is completely uploaded, the process proceeds 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 boat PEI, and the transistor TRI is turned on to energize the shutter front curtain magnet 1-MC1. This causes the shutter front curtain to run.

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

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

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

[Step 111] Since it is not the valve mode, a real time count is performed using the data expanded in step 107, and the calculated shutter time is measured.

[Step 112] When the real time count ends, a pulse signal is output from the output capacitor PE2, and the transistor TR2 is turned on to energize the shutter trailing curtain magnet MG2. This causes the shutter trailing curtain to run.

[Step 113] It is determined whether or not the ON signal of the shutter rear curtain switch 5wCN2 is input to the input boat PA5. Here, the process is performed until the ON signal is input, that is, until the running of the shutter rear curtain is completed. This loop is repeated, and when completed, the process proceeds to step 114.

[Step 114] Set the PAV output to “O”
This returns the aperture to its open state.

[Step 115] Set the output of the output boat PD to 1111.
+, turns on the transistor TR3, and rotates the charging motor MD for mirror down and shutter charging.

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

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

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

[Step 119] Since the content of the multiplexing number register RGME is 0, this means that multiplex photography has ended, so the flag FME indicating the multiplex photography mode is reset to O. Also, set the PME output to 0,
Turn off the multiple shooting mark display.

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

If the multiplex shooting mode is continued, the contents of the multiplexing 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.Therefore, multiplex shooting is not performed. It will be done. Further, when the multiplex photography is completed, the contents of the register RGMH become zero, so the film is fed in step 120 after canceling the multiplex photography mode as described above.

[Step 121] Determine whether or not the on signal of the charge completion detection switch swCGH is input to the input capo PA3. If the on signal is not input, that is, the charging is not completed, step 123 The process proceeds to step 122, and when charging is completed, the process proceeds to step 122.

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

[Step 123] It is determined whether or not the on signal of the switch s wF LM, which is turned on every time one frame of film is fed to the input boat FA4, is input. If the transfer is not completed, the process advances to step 124, and when it is completed, the process advances to step 125.

[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).

[Stay, P 125] At step 123, switch s
When it is detected that the off signal of wFLM has been input, the output of the output port FB 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. If it is not the auto bracketing mode, the process proceeds to step 132; if so, the process proceeds to step 127.

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

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

Also, the contents of the shutter bracket stage number register GRBT are subtracted from the contents of the shutter 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 exposure modes.
This is because the contents of T 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 ports PFD and PTD, and the shutter speed information and aperture value information at this time are displayed.

Next, the program is NEXT2. That is, step 104 jumps to a higher position. In other words, regardless of whether or not the second stroke switch SW2 is on or off (regardless of whether a release signal is generated or not), the next photographing starts. Furthermore, even if the shooting at this time is in the self-mode, the self-timer is not executed for the second and third times and the next shooting starts.

[Step 130] First stroke switch SW2
It is determined whether the off signal is inputted or not. If the off signal is not inputted at this time, step 128
．． The display calculated in step 129 can be viewed. In other words, the final overexposure value can be confirmed at this time. Therefore, since the first underexposure value can be seen in the discrimination display in step 55, all exposure displays of the underexposure value, standard value, and overexposure value during auto bracket shooting can be confirmed in the shooting sequence. becomes possible. When the off signal of the first stroke switch sw2 is input, the process proceeds to step 131.

[Step 131] A flag FABR indicating auto bracketing mode is reset to O. Matade Capo) PF
Set the L output to O''' and turn off the flashing auto bracket mark.

The program then returns to start and enters standby mode.

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

[Step 132] Based on the on/off state of the switch 5wC5 input to the input port PA7, it is determined whether the mode is a quick shooting mode or a single shooting mode. If the mode is a quick shooting mode, the process returns to the start, and in this case, the release button L is pressed. 1. Since the ON signal of the second stroke switch swl, 2 has been input, the next photographing begins. In the case of single shooting mode, the process advances to step 133.

[Step 133] Wait for the off signal of the first stroke switch SW2 to be input. Since this is single shooting mode, the next shooting sequence will not proceed unless the photographer stops suppressing the release button 1. The off signal is input. When is input, the process returns to the start.

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

[Step 150] The output of the output port PC is set to 1''', the transistor TR5 is turned on, and the rewind motor MC is rotated. Thereby, rewinding of the film is started.

[Step 151] Start a rewind timer used to detect whether rewinding of the film has finished.

[Stella 7'152] Film switch swFL
It is determined whether or not the state of M 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 rewinding the film. After that, when all the films are wound up in the cartridge, for example, the cartridge stops rotating and the state of the film switch swFLM no longer changes. If this is detected, the process proceeds to step 154.

[Step 154] The output of the output port PC is set to "0", the transistor TR5 is turned off, and the rewind motor MC is stopped. This completes the rewinding of the film.

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

The program then returns to the start.

Also, during auto bracket shooting, in other words,
If you have to take multiple shots in a row but the film ends midway through, repeat step 1 at the 1st or 2nd frame.
In such a case, auto bracketing should not be continued on the newly loaded film, as there is a risk that the subject may be different or the photographer may misunderstand. It is desirable to notify the photographer of this and cancel the auto bracketing mode at the same time. Looking at this in the flowchart of Figure 9, when the film ends after the auto bracketing mark is displayed blinking in step 101, Automatically moves to film rewind. While this film rewind is in progress, the flashing display of the auto bracket mark has not yet been canceled. Therefore, the auto bracket mark, which would not normally be displayed, is displayed during film rewind. The photographer can know that the film has ended without the auto bracket shooting being completely completed.

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

According to this embodiment, if the flag is set to indicate auto bracketing mode in step 100, a blinking display is performed, and when a series of auto bracket shooting is completed, the display is prohibited in step 131. As a result, the camera operator can definitely know that auto-bracketing photography is in progress, and there is no risk of erroneous operation.

(Modified example) In this embodiment, a blinking display is performed to notify the photographer during auto bracket shooting, but the display at this time may be in a different display format. Alternatively, the information may be notified by sound or the like.

(Effects of the Invention) As described above, according to the present invention, it is displayed that the auto bracketing mode is set, and the detection means performs detection from the time when the auto bracketing shooting control means starts auto bracketing shooting. Until then,
Since the camera is provided with a display means that indicates that auto-bracket photography is being performed using a display format different from the auto-bracket mode display, it is possible to reliably inform the photographer that auto-bracket photography is in progress.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart thereof, and FIG. 3 is a microcomputer disposed in a camera incorporating the embodiment shown in FIG. 4 is a front view of the camera, FIG. 5 is a top view, FIG. 6 is a back view, and FIGS. 7 to 9 are flowcharts. l...Release button, 2.3...Operation lever, 4...Exposure mode selection knob, 5...
...Dial, 6...Switch cover, 7...
...Storage section, swABR...Auto bracket switch, swME...Multiple shooting switch,
COM・・・Microcomputer, TD, 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, 104...
. . . Display means, 106 . . . Counter for the number of shots, 107 . . . Detection means. Figure 1 Figure 2 Figure 4 '/' t)

Claims (1)

[Claims] (1) Auto-bracketing control means that automatically changes the exposure value and performs multiple shots in auto-bracketing mode, and detects that the number of shots by the auto-bracketing control means has reached a predetermined number of times. and displaying that the auto bracketing mode is set, and displaying the auto bracketing mode display from the time when auto bracketing shooting is started by the auto bracketing shooting control unit until the detection by the detecting unit is performed. An exposure control device for a camera, comprising a display means for displaying that auto bracketing shooting is being performed using a different display format.