JPS6337322A - Exposure control device for camera - Google Patents

Abstract

PURPOSE:To prevent the generation of such problems as an exposure is not adjusted, and an optimum shutter change is not seized, by providing an auto bracket photographing control means for starting the continuous photographing by varying automatically an exposure value, by the end of a self-second time, at the time of self-timer photographing in an auto bracket mode, and stopping the continuous photographing in accordance with a detection by a detecting means. CONSTITUTION:An auto bracket photographing control means 103 controls a diaphragm mechanism and a shutter mechanism, etc., and starts auto bracket photographing. Subsequently, the charge operation of the each mechanism, etc., is executed, and whether an auto bracket mode is set or not is discriminated. In such a case, when the automatic bracket mode is set, the auto bracket photographing control means 103 continues the continuous photographing by varying automatically an exposure value, until it is detected by a detecting means 105 that an auto bracket photographing frequency counted by a photographing frequency counter means 104 has reached a prescribed frequency. When it is detected that the auto bracket photographing frequency has reached the prescribed frequency, the detecting means 105 outputs a stop signal to the auto bracket photographing control means 103.

Description

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

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

(Background of the Invention) In conventional self-timer photography using auto-bracketing mode, the shirt release of each frame was performed at the discretion of the photographer, so the self-timer time was counted for each frame. The original purpose of using the auto bracketing mode is to take a plurality of pictures of the same subject at different exposures around the standard exposure to obtain pictures with appropriate exposure that suits the photographer's preference. Self-timer photography is performed in the following order: the photographer presses the release button, moves to the subject, and waits for the shirt to be released automatically. Therefore, in the past, it was necessary to repeat this operation several times to perform auto-bracket photography, which caused the following problems.

That is, first, the photographer has to go back and forth between the camera and the subject several times, which is cumbersome.

Second, there is a high probability that the subject conditions will change during that time and a different photo will be taken, making it impossible to achieve the original purpose of auto bracketing as described above. Problems arise in that even though the photograph captures a photo opportunity, it is not exposed properly, and even though certain frames are properly exposed, the optimum photo opportunity is not captured.

(Object of the Invention) An object of the present invention is to solve the above-mentioned problems, improve operability during self-timer shooting in auto bracketing mode, and satisfy both photo opportunities and appropriate exposure. An object of the present invention is to provide an exposure control device for a camera that can perform the following functions.

(Characteristics of the Invention) In order to achieve the above object, the present invention starts continuous shooting while automatically changing the exposure value when the self-timer expires in auto bracketing mode, and detects comprising an auto-bracket photography control means for stopping the continuous photography in response to detection by the means;
In addition to eliminating the need to perform a release operation every predetermined number of times of auto-bracket photography, the self-timer operation is performed only between the time the release operation is performed and the first photography is started. 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 photographer performs a single release operation on the release operation means lot, it is first determined whether or not the camera is in the self-mode, and if it is the self-mode, the self-timer means 102 starts operating. When the self-timer operation ends, the auto-bracket photography control means 103 controls the aperture mechanism, shutter mechanism, etc., and starts auto-bracket photography.

When this photographing operation is completed, each of the mechanisms described above is charged, and then it is determined whether or not the auto bracketing mode is set.

When the auto bracketing mode is set here, the auto bracketing shooting control means 103 detects by the detection means 105 that the number of auto bracketing shots counted by the number of shooting counter means 104 has reached a predetermined number. Continue shooting continuously while automatically changing the exposure value until As mentioned above, the detection means 105 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, the detection means 105 controls the auto-bracketing shooting control means 103. Outputs a stop 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, l is the release button, 2 is the operating lever for selecting the shooting mode of continuous shooting (C) or single shooting (S), 3 is the operating lever for selecting the self-timer, and 4 is the operating lever for selecting the self-timer. Exposure mode selection knob 5 selects shutter priority (Tv), aperture priority (Ay), or manual (M) exposure mode. swM is a so-called electronic dial that is used to set the aperture value (for example, 2-bit conductive patterns with a phase difference of 90 degrees and a push button), which is used to set the aperture value. By pressing the switch swM and operating the dial 5 in the manual exposure mode, the aperture value can be changed. 6 is a switch M in the storage section 7 that stores rarely used switches.
, 5WABR is an auto bracket switch stored in the storage section 7, and swME is a multiplex shooting switch also stored in the storage section 7.

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

The light-receiving element SPC receives reflected light from the subject and outputs a light-receiving signal to a high input impedance operational amplifier OPI whose feedback circuit is connected to a compression diode DI. The operational amplifier OPI outputs logarithmically compressed object brightness information By via the resistor R1. A variable resistor VR1 connected to a constant voltage source vGl outputs film sensitivity information Sv. An operational amplifier OP2 whose feedback circuit is connected to a resistor R2 calculates and outputs photometric information Ev=(By+Sv). The photometric information Ev is converted into a 4-bit digital value by an A/D converter ADC, and is input to input ports PGO-PG3 of the microcomputer COM.

When the dial 5 is operated, a number corresponding to the number of clicks is counted by the dial interface circuit DIF, and the value is converted into 4-bit information and input to the input port PHo-PG3 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 exposure mode switches 5w5EL are turned on and off, and 2-bit information corresponding to the selected exposure mode is sent to the microcomputer COM (7) input port Pro-. PP
input to I.

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 Swl 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 boat PAl~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 s that turns on every time one frame of film is fed.
wFLM, trailing curtain switch sw that turns on when trailing curtain travel is complete
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, for example, a quick shooting mode is selected by the operation lever 5, and turned off when a single shooting mode is selected, the aperture value setting switch swM, and the switch lid 6 are closed. The switch 5w5ET, which is turned off at times and turned on when opened, the multiplex photographing switch swME, and the auto-bracketing switch swABR are connected, respectively.

The bases of transistors TRO to TR2 are connected to the output boats PEO to PE2 via resistors RIO-12, and the transistors TR0 to TR2 are connected to the tZ constant magnet MG.
It controls the energization of the leading curtain magnet (MCI) that drives the O1 leading curtain and the trailing curtain magnet (MG2) that drives the trailing curtain. Also, resistor R13 is installed on the output boats PD, PC, and FB.
~15, the bases of transistors TR3~5 are connected to JD
The transistor TR3 controls the drive of the charging motor MD, the transistor TR4 controls the drive of the rewind motor MC, and the transistor TR5 controls the drive of the winding motor MD which winds the film at high speed.

Microcomputer 00M from PTD
The contents of the shutter speed information register RGTv are output to the decoder TD, and the decoder TD converts the contents into a signal for displaying the shutter speed seconds and sends this signal to the connected display SEG1 composed of a liquid crystal or the like. Output.

“1” (means high level) or “O” (means low level) from output ports PFL and PABR
signal is output to the decoder AD, and when the decoder AD receives the "L" signal from the output port PFL, the decoder AD outputs a bracket mark to the connected display 5EG2, which is composed of a liquid crystal, etc., for displaying a point reduction. Output a signal. Out capo
) When a signal of "1" is input from the PABR, a signal for displaying the top bracket mark is outputted to the display 5EG2.

Output) From the PME, a signal of "L" or "O" is output to the display device 5EG4 composed of a liquid crystal or the like.
When a signal of "1" is input to the EG4, a multiple shooting mark is displayed.

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 RGBH, 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 DAY is connected to the drive actuator CAV.
For example, the information converted into actual aperture information is output to a stepping motor or the like, and this is driven to perform appropriate aperture control.

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

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

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

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

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

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

[Step 5] From the contents of register RGEv.

The contents of the shutter information register RGTv, which stores the information set by operating the dial 5, are subtracted, and the result (aperture information Ay) is stored in the aperture information register RGAv.
to be memorized. It is assumed that the contents of all registers in the microcomputer 200M are held while the battery BAT is loaded. Further, when the battery BAT is loaded for the first time, it is assumed that a frequently used value, for example, information such as 1/125 seconds is initially set.

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

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

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

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

[Step 9] Auto bracket switch 5WABR
A flag FsAB indicating whether or not has been operated is reset to O. Also, a flag FsME indicating whether the multiplex photographing switch swME has been operated is reset to 0.

[Step 10] The contents of the aperture information register RGAv are output from the output port PFD, and the contents of the shutter information register RGTv are output from the output port PTD. As a result, the aperture value calculated by the calculation is displayed on the display 5EG5, and the set shutter speed time is displayed on the display 5EGI.

[Step 11] The second stroke of the release button l is performed, and it is determined whether the on signal of the second stroke switch sw2 is input to the input boat PAl.
Assuming that the on signal of the younger 2-stroke switch SW2 is not input, the process returns to the start. 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 add the result to 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 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] Register RGTM that stores the shutter speed information set by operating the dial 5
The contents of are stored in the shutter information register RGTv. This is because when auto-bracketing shooting is set in manual exposure mode, the contents of register RGTv change each time a shot is taken, so the information set by operating dial 5 is stored as is. Details will be explained later. do.

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

Next, we will describe information setting by dial operation while the photometry timer is operating. When the depression (first stroke) of the release button 1 is stopped during the above-described sequence, 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 from the state of the switch 5w5ET whether or not the switch M6 has been opened. Assuming that the switch lid 6 remains closed, the input port PA9
Since the off signal of the switch 5w5ET is input to the step 21, the process advances to step 21.

[Step 211 It is determined whether the photometry timer is operating or not. Since this is immediately after the photometry timer was 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 PPl. 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 j [Step 80] Store the information input to the input ports PHO to PH3 in the dial register RGH.

At this time, the register RGH stores a numerical value corresponding to the number of clicks on the dial 5 and information as to whether the numerical value is positive or negative depending on the direction of rotation of the dial 5. That is, 4-bit information indicating how many steps to shift up or down from the current information is stored.

[Step 811 Output] Output the pulse signal of 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
Hejyump.

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. 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 time can be displayed on the total display units 5EGI and 5EG5 in step IO, as in the shutter speed priority mode.

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

[Step 29] 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 ports PTD, PFL.

The outputs of PABR, PME, and PFD are set to "O", and all displays on the displays SEG 1 to 5EG5 (however, display 5EG2 is not present) are turned off. Further, the output of the output port PF is set to "OII", 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 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] In step 9, flag FsME is determined to indicate whether or not the suppression operation of multiple shooting switch swME has been performed.In the initial state of battery BAT loading and in the on state of first stroke switch swl, flag Fs is
Since ME has been reset to O, the process advances to step 43.

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

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

Next, from the above state, auto bracket switch swAB
A case 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 are in the valve mode. If the contents are in the valve mode, the process returns to the start and the auto bracketing mode is not entered.

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

[Step 45] Auto bracket switch SwAB
A flag FsAB indicating that R is turned on is set to 1, and a flag FsME indicating that the multiplex shooting switch swME is on is reset to O.

[Step 46] Output boats PTD, PFL.

Set the outputs of PABR, PME, and PFD to "0" and turn off all displays on display SEG l-3EG5. Next, set only the output of output boat PABR to "l" and turn off display 5.
Turn on the EG3 auto bracket mark. 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] Step 23 or Step 27
Similarly, the 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 Exposure was automatically changed in steps of -1, 0, and IJ. Three preset auto bracket shots will be taken. Furthermore, the above-mentioned r-Q.

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 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. The decoder FD and display 5EG5 used at this time are also used to display the aperture, and the aperture value is decoded from the apex value Av to the F number number, and the auto bracket is decoded from, for example, 0.5. Since it is a numerical value for each stage, it is necessary to change the decoded contents.

For example, if the output from the PFD is 5 bits, 32 types of data can be sent, so if the aperture value is displayed in 0.5 stop increments from Fl, 4 to F32, there are 14 types in total. If the auto bracket display is θ ~ 5 and every 0.5 steps, there are 11 types in total, 30 types in total, and 31 types including blank code, and a certain constant is added when sending data to the PFD. By decoder F
It is possible to determine which information D is.

Appropriate numerical display becomes possible.

[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 multiple shooting mode is selected, the process advances to step 51.

[Step 511 Set the contents of the register RGME for the number of multiple shots to "3". This is because the number of J-de bracket shots is predetermined to be three, so even if the number of times for multiple shots is set arbitrarily. The program is forced to repeat three times in order to prevent operator errors and 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 M6 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 0 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 2 and step 31, the auto bracket mark display disappears at step 30 and the step 31 flag FsA
B is reset and the process does not proceed to the auto bracket stage number change mode again.

Next, exposure calculation in auto bracketing mode will be explained. In the case of shutter priority mode, the contents of the bracket stage number register RGBH are stored in the aperture bracket stage number register RGBA as described in step 6, and in the case of shutter priority mode and manual exposure mode, the contents of the bracket stage number register RGBH are stored in step 14.
As mentioned above, the shutter bracket stage number register RGB
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 O. Matade Capo) PABR
Set the output to “0” and turn off the auto bracket mark display.

Next, by proceeding to step 8, the auto-bracketing exposure calculation is not performed, the flag FsAB is reset to 0, and a 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 the output boat PABR to “1”
and display the auto bracket mark. This is because when the switch 5w5ET is turned off by closing the switch cover 6 from the auto bracket mode setting state, 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 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 that switches is the main part.

Further, in step 55, the first stroke switch sw
If it is determined that l is off, the exposure calculation in step 56 is not performed because the photometry timer is operating.
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.

Since two-bladder photography in bulb photography is basically meaningless, 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.

[Step 57] Set the PABR output to “O”
to turn off the auto bracket mark display. Also, reset the auto bracket mode flag FABR to 0.

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 indicating that the auto bracketing switch swABR is turned on is reset to FsABt-0.

[Step 61] Output boat PTD, PFL.

Set the outputs of PABR, PME, and PFD to “o”.

Set the output of only PME to "l" and set the multiple shooting mode mark to display 5E.
Display it on G4.

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

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

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

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

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

[Step 66] Add the contents of the multiplexing number register ROMH and the contents of the dial register RGH, and store the result in the register 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. 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. To shift from auto bracketing step number change mode to multiple shooting setting mode, just turn on the switch swMEt once.
It is also clear from the flowchart in FIG. 7 that the reverse transition can be accomplished by turning on the switch swABR once.

Next, if the number of times of multiplexing is set once and then the number of times of multiplexing is set to zero (°O), it is necessary to cancel the multiplex photography mode and turn off the multiplex photography mark. Since flag FME is set to 1 in step 8, this program is executed by proceeding to state 68.

[Step 68] If the contents of the register ROMH for the number of multiple shots is zero, the process advances to step 69.

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

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

[Step 70] Set the output of output port PMH to °°1”
The multiple shooting mark will be displayed. This is step 3
0 turns off all the display, so press the release button B again.
This is to notify the photographer that the multiple shooting mode is activated when the i-mist flow is performed.

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 l is performed and the on signal (release signal) of the second stroke switch sw2 is input to the input capo PAL, the process advances from step 11 in FIG. 7 to step 100 in FIG. 9. .

[Step 100] 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 1'01; otherwise, the process proceeds to step 102.

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

[Stella 7'102] Determine whether or not the ON signal of the self-switch 5ELF is manually input to the input boat PA6. If the ON signal is input, it means that the self-timer is used for photography, so go 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 RGAy are output from the output port (PAY). As a result, the aperture control drive circuit DAY 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 106] It is determined whether or not the ON signal of the switch sMRUP for detecting the completion of mirror up is input to PA2. This loop is repeated until the image is completely uploaded, and when the image is completely uploaded, the process proceeds to step 107.

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

[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 MGl. This causes the shutter front curtain to run.

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

If the valve mode is set, proceed to step 11O, otherwise proceed to step ill.

[Step 1101 Second stroke switch SW2
Since this is the valve mode, it is necessary to keep the shutter open while the on signal of the second stroke switch sw2 is 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,
Output a pulse signal from the output boat PE2, turn on the transistor TR2, and turn on the shutter rear curtain magnet (MG2).
energize. This causes the shutter trailing curtain to run.

[Step 113] It is determined whether or not the ON signal of the shutter rear curtain switch 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 advances to step tta.

[Step 114] Set the output of PAY to “°
Make it Opa. As a result, the diaphragm returns to its open state.

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

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

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

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

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

[Step 120] Start a timer for film feeding. Also, set the output of FB to "L", turn on transistor TR5, and turn on film feeding motor MB.
Rotate.

If the multiplex shooting mode is continued, the contents of the multiplexing number register ROMH are not zero, so the process proceeds from step 11B 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 charging completion detection switch s w CG H is input to the input boat PA3. If the on signal is not input, that is, the charging is not completed, step 12
The process proceeds to step 3, and when 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 or not the on signal of the switch s wF LM is input to the manual boat PA4 every time one frame of film is fed. 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] The state of the film feeding timer is determined. 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 swF
When it is detected that the LM 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 bracketing mode is set or not based on the state of the flag FABR. If it is not the auto bracketing mode, the process proceeds to step 132; if so, the process proceeds to step 127.

[Step 127] 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 1281: Subtract the contents of the aperture bracket step register GRBA from the contents of the aperture information register RGAV, and store the result 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 RGA v 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.

The program then jumps to NEXT2, step 104. In other words, regardless of whether the second stroke switch SW2 is on or off (regardless of whether a release signal is generated or not), the first photographing starts. Furthermore, even if the shooting at this time is in the self-mode, the 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 2 129 can be viewed. In other words, the final overexposure value can be confirmed at this time. Therefore, since the first underexposure value can be seen in the discrimination display in step 55, all exposure displays of the underexposure value, standard value, and overexposure value during auto bracket shooting can be confirmed in the shooting sequence. becomes possible. When the off signal of the first stroke switch sw2 is input, the process proceeds to step 131.

[Step 1311: Reset flag FABR indicating auto bracketing mode to 0. Matade Capo) P
Set the FL output to “0” and turn off the flashing auto bracket mark.

The program then returns to start and enters standby mode.

Next, a case where the auto bracket mode is not set will be described. In this case, since the flag FABR is O, the process advances from step 128 to step 132.

[Step 132] Determine whether it is a quick shooting mode or a single shooting mode based on the on/off state of the switch Swcs input to the input boat PA7. In the case of the 0Mi shooting mode, return to the start, and in this case, press the release button L. 1. Since the ON signal of the second stroke switch swl, 2 has been input, the next photographing begins. In the case of single shooting mode, the process advances to step 133.

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

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

[Step 150] The output of the output boat PC is set to "1", the transistor TR5 is turned on, and the rewind motor MC is rotated. This starts rewinding the film.

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

[Step 152] It is determined whether the state of the film switch swFLM has changed. If it has changed, the process returns to step 151 and the rewind timer is started again. If there is no change, the process advances to step 153.

[Step 153] It is determined whether or not the time measurement by the rewind timer has ended. If it has not ended, the process returns to step 152.

As can be seen from the above, step 152. The process proceeds through the loop of step 153, and when it is detected that the feeding of one frame has been completed, the process proceeds from step 152 to step 151, and this loop is rewound 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 capacitor 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 O. Also output boat PFL
Set the output to “O” 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, 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 auto bracketing mode at the same time. Looking at this in the flowchart of FIG. 9, when the film ends after the auto-bracketing mark is flashed in step 101, the process automatically shifts to film rewinding. While this film rewind is in progress, the flashing display of the auto bracket mark has not yet been canceled. Therefore, the auto bracket mark, which would not normally be displayed, is displayed during film rewind. 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 O in step 155, the inconvenience of continuing auto-bracketing on newly loaded film as in conventional cameras is eliminated.

According to this embodiment, when shooting with the self-timer in the auto bracket mode, the self-timer is operated only when a release signal is first generated, and is not operated during subsequent shooting (step 129 and jump to step 104). After the timer operation ends, the flag FA indicating the mode remains until auto bracketing ends.
Since BR remains set to 1 (step 126
), it is possible to achieve both a photo opportunity and proper exposure, and the operation is simple. In other words, 1. As with normal self-timer shooting, the photographer only needs to move once, and after that, the film is advanced at high speed by a motor drive, so changes in the subject can be minimized, and automatic Since auto-bracket photography is executed continuously for a predetermined number of frames, it is possible to ensure that at least one frame is photographed to the photographer's satisfaction.

(Effects of the Invention) As explained above, according to the present invention, during self-timer shooting in auto bracketing mode, continuous shooting is started while automatically changing the exposure value when the self-timer expires, and the detection comprising an auto-bracket photography control means for stopping the continuous photography in response to detection by the means;
This eliminates the need to perform the release operation every predetermined number of times of shooting the camera, and the self-timer operation is performed only between the time the release operation is performed and the first shooting starts. , it is possible to improve the operability during self-timer photography in auto bracket mode, and also to satisfy both the photo opportunity and appropriate exposure.

[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, FIGS. 6 and 6 are back views, and FIGS. 7 to 9 are flowcharts. 1... Release button, 2, 3... Operate 8-24... 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, 102...Self-timer means, 103...
...Auto bracket shooting control means, 104...
... 1 counter for the number of shots, 105...
Detection means.

Claims (1)

[Claims] (1) A counter means for counting the number of shots taken in the auto bracketing mode, a detection means for detecting when the number of shots taken by the counter means reaches a predetermined number, and a self-second timer for counting the number of shots taken in the auto bracketing mode. An exposure control device for a camera, comprising an auto-bracketing control means that starts continuous shooting while automatically changing the exposure value upon termination, and stops the continuous shooting in response to detection by the detection means.