JPS6337333A - Exposure control device for camera - Google Patents

Abstract

PURPOSE:To inform to a photographer that autobracket photographing is imperfect, by providing a warning display means for executing a warning display while rewinding a film when the film is consumed before a detection by a detecting means is executed. CONSTITUTION:When a first photographing is ended, the charging operation of each mechanism and the winding operation of a film are executed, and whether the end of the film is detected by a film end detecting means 103 or not is decided. In such case, in case of the end of the film a signal for showing its fact is outputted to a rewinding control means 104 by the film end detecting means 103, and the rewinding of the film is started. Also, by the rewinding control means 104 concerned, the film rewinding operation is started, and simultaneously, a signal for showing its fact is inputted to a warning display means 105, and in such case, when a signal for showing a fact that autobracket photographing is not completed vet is inputted from the under-mentioned detecting means, the warning display means 105 concerned executes a warning display for informing to a photographer that the autobracket photographing is not completed yet.

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 cameras of this type, if the film runs out during auto-bracketing, the film is rewound and the previous auto-bracketing continues when a new film is inserted. was. However, the original meaning of auto-bracketing is to photograph the same subject at different exposure levels, and if the film ends midway through, the process of rewinding the film and inserting a new film will cause the time to elapse. However, the subject often changes, resulting in a different shooting result from the original auto bracket shooting. Also, considering the points mentioned above, it may be possible to cancel auto bracketing mode in such a situation, but in any case, auto bracketing shooting in this case is different from shooting in its original meaning. , it is necessary to notify the photographer in some way that the auto bracket shooting was not perfect.

(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 notify a photographer that auto-bracket photography is incomplete.

(Characteristics of the Invention) In order to achieve the above object, the present invention includes a warning display means for displaying a warning during film rewinding when the film ends before the detection means detects the film. The present invention is characterized in that a warning that auto-bracketing photography is not completed is displayed using the time between film rewinding.

(Embodiment of the Invention) FIG. 1 shows the basic configuration of an embodiment of the invention, and FIG. 2 shows its flowchart.

The release operation of the release operation means 101 by the photographer (
When the second stroke) is performed, the auto bracket photography control means 102 controls the aperture mechanism, shutter mechanism, etc.
Start auto bracket shooting. When the first photographing is completed, the charging operation of each mechanism and the film winding operation are performed, and then the film end detection means 103
A determination is made as to whether or not the end of the film has been detected. If the film has ended, the film end detection means 103 outputs a signal indicating this to the rewind control means 104, and rewinding of the film is started. Further, at the same time as the film rewinding operation is started by the chain rewinding control means 104, a signal indicating this is inputted to the warning display means 105, and at this time, a signal indicating that auto bracket photography is not completed is sent from the detection means described later. If it has been input, the warning display means 105 displays a warning to notify the photographer that auto-bracket photography has not been completed, and a signal indicating the end of film rewinding is input from the rewind control means 104. This is done until the film is rewound.

On the other hand, if the film has not ended, it is then determined whether the auto bracket mode is set. Since auto bracketing mode is set here,
The auto bracket shooting control means 102 automatically changes the exposure value until the detection means 107 detects that the number of auto bracket shots counted by the number of shots counter 106 has reached a predetermined number. Continue continuous shooting. As can be seen from the foregoing, the detection means 107 detects whether or not the number of auto-bracketing shots has reached a predetermined number.

(Embodiment of the Invention) FIG. 1 shows the basic configuration of an embodiment of the invention, and FIG. 2 shows its flowchart.

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

FIG. 4 shows the arrangement of each operating member when looking from the front of the camera incorporating the device embodying the embodiment shown in FIG. 1, and FIG. 5 shows the arrangement of each operating member when looking from above. FIG. 6 shows the arrangement of each operating member when viewed from the back side. Fourth
In Figures ~6, 1 is a release button, 2 is an operating lever for selecting the shooting mode of quick shooting (C) or single shooting (S), and 3 is an operating lever for selecting the self-timer./<-14
5 is the exposure mode selection knob that selects the exposure mode of shutter priority (Tv), aperture priority (Ay), or manual (M), and 5 is the shutter speed, aperture value, or exposure step information for auto bracket shooting ( For example, it is used when setting information for every 0.5 step or every 1 step, etc.
For example, a so-called electronic dial, swM, is equipped with 2-bit conductive patterns and brushes that are 90 degrees out of phase with each other.
is a switch for setting an aperture value, and the aperture value can be changed by pressing the switch swM and operating the dial 5 in the manual exposure mode. Reference numeral 6 denotes a switch lid of a storage section 7 that stores switches that are rarely used, swABR represents an auto bracket switch stored in the storage section 7, and swME also represents the storage section 7.
This is a multiplex shooting switch housed in the camera.

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 OP1 having a compression diode Di connected to a feedback circuit. The operational amplifier OPI outputs logarithmically compressed object brightness information By via the resistor R1. Variable resistor VR1 connected to constant voltage source VGI outputs film sensitivity information Sv. An operational amplifier OP2 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 the microcomputer CO
M input capo) is input to PGO to PG3.

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 to 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, the two series of exposure mode switches 5w5EL are turned on and off, and 2-bit information corresponding to the selected exposure mode is sent to the input port ppo-ppt of the microcomputer COM.
is input to.

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

AD, FD and dial interface circuit DI
A power supply Vbat is supplied to F and the like. Also, the release button l
When the first stroke switch SW1 connected to the input 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.

Input ports PA1-11 of microcomputer COM
, the second stroke switch SW2 is turned on by the second stroke of the release button 1, turned off by raising the mirror,
Mirror up switch swM that turns on when the mirror is down
RUP, fi Charging completion detection switch swCGE, film 1 that turns on when mechanical charging is completed
Film switch s that turns on every time frame feeding is completed
wFLM, trailing curtain switch 5w that turns on when trailing curtain travel is completed
CN2, a self-switch 5w5E that is turned on when the self-timer is set by the operating lever 3;
LF, a switch 5wC5 that is turned on when, for example, a quick shooting mode is selected by the operating lever 5, and turned off when a single shooting mode is selected, the aperture value setting switch swM, and is turned off when the switch M6 is closed. , a switch 5w5ET that is turned on when opened, the multiplex photographing switch swME, and the auto-bracketing switch swABR are connected, respectively.

The bases of transistors TR0-TR2 are connected to the output port PE0NPE2 via resistors RIO~12, and the transistors TR0-TR2 are connected to the first clamping magnet MG.
It controls the energization of the leading curtain magnet MGl that causes the O1 leading curtain to run and the trailing curtain magnet MG2 that causes the trailing curtain to run. Also, resistor R13 is installed on the output boats PD, PC, and FB.
The bases of transistors TR3 to TR5 are connected through transistors TR3 to TR5, transistor TR3 drives charging motor MD, transistor TR4 drives rewinding motor MC, and transistor TR5 winds the film at high speed. The 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 700M 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 "1" (meaning high level) or °"0゛° (meaning low level) to decoder AD, and decoder AD
When a signal of "1" is input from the output port PFL, it outputs a signal for displaying a one-bracket mark point decrement to the connected display 5EG2 constituted by a liquid crystal or the like.

When a "loo" signal is input from the output port PABR, a signal for displaying a top bracket mark is output to the display 5EG2.

Output) From the PME, a signal of "1" or "0°" is output to the display 5EG4 composed of a liquid crystal, etc., and when the signal of "1" is input, the display 5EG4 performs multiplexing. Displays the shooting mark.

From the output port PFD, the microcomputer 700M
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 RGMH are output to the decoder FD. The decoder FD outputs a signal for numerical display corresponding to each of the above-mentioned contents to a connected display device 5EG5 composed of a liquid crystal or the like.

The contents of the aperture value information register RGAv in the microcomputer 700M 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 on signal of wl is input to the input port PAO, the process proceeds to step 2.

[Step 2] Output the signal II from the output port PF, turn on the transistor TRbat, and supply the power Vcc to each part. Next, start the photometry timer. The photometry timer is connected to the first stroke switch sw.
This is to keep the power supply Vcc continuously supplied for a predetermined period of time from the off signal input of the shutter release button L. This allows the photographer to check the metering status for a predetermined period of time even if the photographer takes his hand off the release button L, and the exposure mode selection knob 4, it becomes possible to change the setting information while viewing the display. Note that this configuration can be easily performed using a hardware timer built into the microcomputer COM.

[Stella 7'3] A/D converter ADC 4
The photometric information Ev converted into a bit digital value is stored in an internal register RGEv.

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

[Step 5] Subtract the contents of the shutter information register RGTv, which stores information set by operating the dial 5, from the contents of the register RGEv, and store the result (aperture information Av) in the aperture information register RGAv. let It is assumed that the contents of all registers in the microcomputer C0M are held while the battery BAT is loaded. Also, if the battery DAT is loaded 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 FABR indicating whether auto bracketing mode is set. Assuming that auto bracketing mode is not currently set,
Proceed to step 8.

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

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

[Step 9] Auto bracket switch 5WAB
A flag FsAB indicating whether R has been operated is reset to 0. Also, a flag FsME indicating whether 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 port PFD, and the contents of the shutter information register RGTv are output from the output port PTD. As a result, the aperture value calculated by the calculation is displayed on the display 5EG5, and the set shutter speed time is displayed on the display SEG1.

[Step 11] The second stroke of the release button 1 is performed, and the on signal of the second stroke switch SW2 is input, which determines whether the on signal of the $2 stroke switch SW2 is input to the input boat PAL. If not, return to the start. Also, while the ON signal of the first stroke switch swl is being input, subject brightness information, film sensitivity information,
Calculation information can be obtained from the setting information and this information can be displayed.

Further, if the aperture priority mode is set, the process proceeds from step 4 to step 12 to step 13.

[Step 13] The contents of the register RGAv, which stores the information set by the operation of the dial 5 and the aperture value setting switch swM, are subtracted from the contents of the register RGEv, and the result is added to the shutter information register RGTv.
to be memorized.

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

[Step 14] The contents of the bracket stage number register 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 5EG1.

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. If the switch cover 6 remains closed, the input capo) PA9
Since the off signal of the switch 5w5ET is input to the step 21, the process advances to step 21.

[Step 21] It is determined whether the photometry timer is in operation. Since this is immediately after the photometry timer has been activated in step 2, the process advances to step 22.

[Step 22] It is determined from the input states of PPO and PPI whether or not the shutter priority mode is set. If the shutter priority mode is currently set, the process proceeds to step 23.

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

"Information Reading Routine J [Step 801 Information input to the human-powered boats 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 the pulse signal of PE3. As a result, the dial interface circuit D
The value of IF is reset to zero.

[Step 82] Return to the original step.

Returning again to the flowchart in FIG.

[Step 24] The numerical value set by the dial operation (the contents of register RGH) and the shutter information (the contents of register R
(contents of GTv) and stored in the shutter information register RGTv again.

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

[Step 25] It is determined whether a certain code indicating a valve mode located next to the longest second of the shutter speed is stored in the register RGTM. Assuming you are not in valve mode now, go to NEXTl, that is, step 3.
Hejyump.

In this way, during the photometry timer after the press of the release button 1 (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, the 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 the aperture value and shutter speed can be displayed on the displays 5EG1, 5EG5, respectively, in step 1O, 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 the displays 5EGI to 5EG5 (however, the display 5EG2 is not present) are turned off. Also, the output of the output capacitor) PF is set to "0", the transistor TRbat is turned off, and the supply of the power supply Vcc is stopped.

[Step 31] Similar to step 9, 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 4o.

[Step 40] Auto bracket switch SwA
Since the switch M6 for determining BR has just been opened and the auto bracketing switch swABR 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] A flag FsME indicating whether or not the multiple shooting switch swME has been pressed is determined. In the initial loading state of the battery BAT and in the ON state of the first stroke switch swl, the flag FsME is reset to 0 in step 9, so step 4
Proceed to step 3.

[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 5WAB
A case where the R suppression operation is performed once will be described. When the auto bracketing switch swABR is suppressed, an on signal is input to the input capo-hPA11. The program then proceeds to step 40 or 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 port PTD, PFL.

Set the outputs of PABR, PME, and PFD to "0" and turn off all the displays on display 5EGI-SEG5. Next, set only the output of output port PABR to 1, and set display 5EGI to 0.
Turn on the auto bracket mark 3. This allows the operator to clearly know whether 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, if the stage number information is set to 0.5 using the dial 5, for example, the stage number is r-0,5,0°0.5'', and if 1 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 “−〇.

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 RGB
Add the contents of H and the contents of the dial, and register RG again.
Store it in BH. As mentioned above, the minimum resolution by one click of the dial 5 can be set freely in increments of 0.5 steps or in increments of 1 step. Note that if the 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 a numerical value indicating the number of stages, such as ``ro, 5'', is 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, but if the output from the PFD is, for example, 5 bits, 32 types of data can be sent, so the aperture value display can be changed. Fl, 4 to F32, every 0.5 step, total 1
4 types, if the auto bracket display is O to 5 and every 0.5 step, there are 11 types in total, 30 types in total, 31 types when blank code is included, output capo) Constant when sending data to PFD Decoder FD by adding
It is possible to determine which type of information it is, 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.

The auto bracket stage number changing mode can be canceled by turning on the first stroke switch swl, or by closing the switch lid 6 and turning off the switch 5w5ET. In other words, when the ON signal of the first stroke switch SW1 is input, the program progresses in the order of step 1 → step 2 → step 3 →..., and the flag FsAB is reset to O in step 9, and its display is also In step 10, the display switches to normal display. Also switch 5w5ET
When the off signal is input, step 20 → step 2
In the process of the program proceeding from step 1 to step 30 to step 31, the auto bracket mark display disappears at step 30, and the step 31 flag FsAB is reset, so that the program 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 RGBR
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. Also output port PABR
Set the output to 0" and turn off the auto bracket mark display.

Next, by proceeding to step 8, the auto-bracketing exposure calculation is not performed, the flag FsAB is reset to 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 output port 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 or not the first stroke switch SW1 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 R is added again.
Store it in GTv. This means that the aperture information calculated in the shutter priority mode and the shutter speed information calculated in the aperture priority mode are changed in accordance with the number of autobracket stages. In other words, if the autobracketing step number is set so as not to be a negative number at step 49, the value after the calculation at step 56 will be an exposure value on the under side of the standard exposure value. In addition, in manual exposure mode, since step 14, which is the same as in aperture priority mode, is passed, the shutter speed is changed, and the aperture value is not changed as in conventional cameras, so only exposure with a constant depth of field is used. Auto-bracketing photography is now possible.

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

Even in this case, when taking a picture, the first stroke of the release button L is always made, so step 56 is always passed.
Therefore, there is no problem with auto bracketing photography.

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

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

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.

[Step 57 Output] Set the output of PABR to “°0”
'' and 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 60] A flag FsME indicating that the multiplex photographing switch swME is turned on is set to 1. Also, a flag FsAB indicating that the auto bracket switch swABR is turned on is reset to O.

[Step 61] Output port PTD, PFL.

Set the outputs of PABR, PME, and PFD to "0" and turn off all displays. Set the output of only output port PME to "1n" and set the multiple shooting mode mark on display 5EG4.
to be displayed.

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

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

[Step 64] Since the mode is auto bracketing, similarly to step 51, the number of multiple shots is forcibly set to three, that is, the content of the register ROMH for the number of multiple shots is set to "3".

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

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

[Step 66] Add the contents of the multiplexing number register RGMH and the contents of the dial register RGH, and store the result in the register RGMH again. Note that the number of times of multiplexing is an integer, so if the resolution of l clicks on the dial 5 is 0.5 steps, the contents of the dial register RGH will be 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 ROMH are output from the output port PFD and displayed on the display 5EH5.

The program then returns to the start. Furthermore, once the ON signal of the switch swME is input, the flag FsME is set to 1 in step 60, so even if the OFF signal of the switch swME is input thereafter, the flag FsME is set to 1 in step 60.
1→Step 42→Step 63, and it becomes possible to maintain the multiple shooting number setting mode. The flow in Figure 7 shows that to shift from the auto bracketing step number change mode to the multiplex shooting setting mode, you only need to turn on the switch swME once, and to switch vice versa, you only need to turn on the switch swABR once. It is also clear from

Next, if you set the number of multiplexes once and then set the number of multiplexes to zero (0), use the multiplex shooting mode.

It is necessary to cancel the multiple shooting mark and turn off the multiplex shooting mark. Since the flag FME is set to 1 in step 8, this program is executed by proceeding to step 68.

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

[Step 69] Flag FME indicating multiple shooting mode
Reset to 0. Also, set the output of output port PME to 0”
to turn off the multiple shooting mark display.

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

[Step 70] Set the output of the output port PME to 1"' and display the multiple shooting mark. This is done in step 30.
To turn off all the displays, press the release button 1 again.
This is to notify the photographer that the multiple shooting mode is active when a stroke is made.

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

[Step 100] It is determined whether the auto bracketing mode is set or not based on the state of the flag FABR. Step 101 if in auto bracket mode
, otherwise proceed to step lO2.

[Step 101] Set the output of output port PFL to °“1.
Then, the auto bracket mark on the display 5EG2 flashes. This allows the photographer to reliably know that auto bracket photography has started.

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

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

[Step 104] The contents of the aperture information register RGAy are output from the output port PAv. As a result, the aperture control drive circuit DAV converts the contents of the register RGAv into actual aperture information.

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

[Step 105] A pulse signal is output from the output capo PEO, and the transistor TRO is turned on to energize the mirror-up magnet MGO, which is the first fixed 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 swMRUP, which detects the completion of mirror up, is input to the input boat PA2.Here, it is determined whether the on signal is input to the input boat PA2, that is, until the mirror is completely raised. This loop is repeated until the image is completely uploaded, and the process proceeds to step 107.

[Step 107] Shutter information register 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 capo PEI, and the transistor TRI is turned on to energize the shutter front curtain magnet MG1. 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 2 110; otherwise, the process proceeds to step tti.

[Stay, pull 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,
Output a pulse signal from PE2 (output capo), turn on transistor TR2, and turn on the shutter rear curtain magnet (MG2).
energize. Due to this.

The shutter rear curtain runs.

[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 0.
Make it a pa. As a result, the diaphragm returns to its open state.

[Step 115] Set the output of the output port FD 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 0, it means that multiplex photography has ended, so the flag FME indicating the multiplex photography mode is reset to 0. Also, set the PME output to 0" and turn off the multiple shooting mark display.

[Step 120] Start a timer for film feeding. Also, set the output of output capo) PB to "1'°, turn on transistor TR5, and turn on film feeding motor M.
Rotate B.

If the multiple shooting mode is continued, the contents of the multiplex number register RGMH are not zero, so the process advances from step 118 to step 121, and since step 120 is not passed, film feeding is not performed, so multiple shooting is not performed. It will be done. Further, when the 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 port PD is set to "O" and the power to the charging motor MD is cut off.

[Step 123] It is determined whether or not an on signal of the switch swFLM, which is turned on every time one frame of film has been fed, is input to the input capo FA4. If the ON signal has not been input, that is, if the feeding of one frame of film has not been completed, the process proceeds to step 124, and if completed, the process proceeds 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).

[Step 125] In step 123, switch s
When it is detected that the FLM off signal has been input, the output of the output capacitor (PB) is set to "0", the transistor TR5 is turned off, and the film feeding motor MB is stopped.

[Step 126] It is determined whether the auto bracket mode is set or not based on the state of the flag FABR. If it is not auto bracketing mode, step 132
If so, proceed 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, shutter priority, aperture priority,
The same program can be used even in manual exposure mode.
In steps 6 and 14, registers RGBA, RG
This is because the contents of BT have been changed. It is clear from this arithmetic expression (subtraction formula) that the second shooting will result in standard exposure, and the third shooting will result in overexposure.

[Step 129] The contents of the registers RGAv and RGTv are output from the output 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 or not the second stroke switch SW2 is on or off (regardless of whether a release signal is generated or not), the next photographing starts. Furthermore, even if the shooting at this time is in the self-mode, the self-timer is not executed for the second and third times and the next shooting starts.

[Step 130] It is determined whether the off signal of the first stroke switch SW2 is input. If the off signal is not input at this time, step 128.
The display calculated in step 129 can be viewed.

In other words, the final overexposure value can be confirmed at this time. Therefore, since the 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 0. Matade Capo) PF
Set the L output to QIT 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: Determine whether the mode is quick shooting mode or single shooting mode based on the on/off state of switch 5wC5 input to input boat PA7. If it is quick shooting mode, return to the start, and in this case, press release button 1 to suppress operation. 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 input, the process returns to the start.10 Next, we will discuss the case where the film ends in the middle of shooting. In this case, as described above, the time measurement by the film timer, which is, for example, a one-second timer, ends, so the process proceeds from step 124 to step 150.

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

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

[Step 152] Film switch swFLM
If the state has changed, the process returns to step 151 and starts the rewind timer 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 the process has not ended, the process returns to step 152.

As can be seen from the above, step 152. The process proceeds through the loop of step 153, and when the completion of feeding of one frame is detected, the process proceeds from step 152 to step 151, and this loop is repeated when rewinding the film. After that, when all the film is wound up in the cartridge, 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 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 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, if the film ends before auto-bracketing is completed, the flashing display indicating that auto-bracketing is in progress is not turned off, and the film is rewound while the flashing display remains on. In other words, the display is made to blink during film rewinding, which is normally not displayed, and is turned off only when film rewinding is completed (step 155). The photographer can easily know that auto-bracket photography is not perfect, making the camera very user-friendly.

(Modification) In this embodiment, if the film runs out before auto bracketing is completed, a flashing display indicating that auto bracketing is in progress is displayed as a warning. The configuration may include the following. In this case, for example, the flowchart may be such that the display is displayed at the same time as it is determined in step 124 that the film timer has ended, and the display is erased when it is determined in step 153 that the rewind timer has finished.
It goes without saying that the display at this time may be in another form of display rather than a blinking display, or may be notified by sound.

(Effects of the Invention) As described above, according to the present invention, the warning display means is provided for displaying a warning during film rewinding if the film ends before the detection by the detection means is performed. Since the film rewinding period is used to display a warning that auto-bracket photography is incomplete, it is possible to notify the photographer that auto-bracket photography is incomplete.

[Brief Description of the Drawings] Fig. 1 is a block diagram showing one embodiment of the present invention, Fig. 2 is a flowchart thereof, and Fig. 3 is a camera incorporating the embodiment shown in Fig. 1. 4 is a front view of the camera, FIG. 5 is a top view, FIG. 6 is a back view, and FIGS. 7 to 9 are flowcharts. 1...Release button, 2.3...Operation lever, 4...Exposure mode selection knob, 5...
···dial. 6...Switch lid, 7...Storage section, s
wABR・・・Auto bracket switch, sw
ME...Multiple shooting switch, COM...
・Microcomputer, TD, AD, FD...
・Decoder, 5EGI~5EG5...Display unit,
DIF・・・Dial interface circuit, M
B, MC, MD...Motor, 102...
・Auto bracket shooting control means, 105...
Warning display means, 106...Counter for number of shots, 107...Detection means.

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. 1. An exposure control device for a camera, comprising a detection means for detecting the film, and a warning display means for displaying a warning during film rewinding if the film ends before the detection by the detection means.