JPS6337332A - Exposure control device for camera - Google Patents

Abstract

PURPOSE:To allow a photographer to confirm a main exposure value in accordance with necessity, by providing a display means for displaying a first autobracket exposure value, displaying an exposure value by photometric information, and displaying the n-th autobracket exposure value, after photographing by the n-th autobracket exposure value is ended. CONSTITUTION:An autobracket photographing control means 105 controls a diaphragm mechanism and a shutter mechanism, etc., based on the first autobracket exposure value obtained by an exposure value arithmetic means 101, and starts autobracket photographing. Thereafter, the same operating instruction is executed until it is detected to reach a prescribed frequency (n) by a photographing frequency discriminating means 106. When autobracket photographing up to (n) number of times is ended, whether the device is in a state that the first stroke of a release button is executed or not is discriminated, and in case of a state that the first stroke is executed, a last exposure value calculated by the exposure value arithmetic means 101, namely, the n-th autobracket exposure value is outputted to a display means 104 from the exposure value arithmetic means 101 concerned, and the last exposure value is displayed.

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, IJ refers to the offset of the camera relative to the shutter speed and aperture value set by the photographer. Simply put, when photographing a certain subject, multiple photographs are taken by changing the exposure value in several stages. This means that the camera automatically takes pictures.

(Background of the Invention) When auto-bracketing is performed continuously on predetermined film frames, it is difficult for the photographer to check the exposure control value, that is, shutter speed information and aperture value information for each frame. Become. Therefore, you will be shooting without being able to check the degree of camera shake or the flow of a moving subject with respect to shutter speed information, and the depth of field with respect to aperture value information, making it difficult to perform proper auto-bracketing. There may be cases where this is not possible.

(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 allows a photographer to check the main exposure values related to auto bracket photography as necessary. It is.

(Features of the Invention) In order to achieve the above object, the present invention displays a first auto-bracketing exposure value by the first stroke of the release button before auto-bracketing shooting, and by releasing the first stroke of the release button. Displays the exposure value based on photometric information,
After shooting with the nth autobracketing exposure value, the first stroke of the release button is held, so that n
A display means for displaying the 1st and nth auto-bracketing exposure values and the exposure value based on the metering information is displayed in accordance with the state of the first stroke of the release button for auto-bracketing shooting. It is characterized by being displayed for a relatively long time when the program is not being executed.

(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 the first stroke operation of the release button and the photometric information calculated by the photometric circuit of the camera is input, the exposure value calculating means 101 calculates the exposure value based on the information. Further, the first stroke operation of the release button is performed here to read the level change amount information set by the level change amount setting means 102 and stored in the level change amount storage means 105 to be changed during auto bracket shooting. If the first stroke operation is still being performed, the exposure value calculation means 101 performs the first auto operation based on the exposure value calculated from the level change amount information and the photometry information. The exposure value used during bracket photography is calculated and the information is output to the display means 104. As a result, the display means 104 displays the first auto-bracketing exposure value. On the other hand, if the first stroke operation has been stopped, the exposure value calculation means 101 outputs the exposure value calculated from the input photometric information to the display means 104. Therefore, the display means 104 displays the exposure value used during the second auto-bracketing photographing, for example.

After that, when the photographer performs the second stroke operation of the release button, the routine for calculating the exposure value used during the first auto-bracketing shooting is always passed.
The auto bracket shooting control means 105 controls the aperture mechanism, shutter mechanism, etc. based on the first auto bracket exposure value obtained by the exposure value calculation means 101, starts auto bracket shooting, and then switches to auto bracket mode. A determination is made as to whether or not it is set. Since the mode is auto-bracketing here, it is then determined whether auto-bracketing photography has been performed a predetermined number of times. If the predetermined number of times has not been reached, the auto-bracketing control means 105 uses the second auto-bracketing exposure value obtained by the exposure value calculation means 101 (in this example, the exposure value calculated from the photometry information). to control the diaphragm mechanism, shutter mechanism, etc., and start the second auto-bracket photography. Thereafter, similar operation instructions are given by the photographing frequency determining means 106 until the photographing frequency determining means 106 detects that the predetermined number n has been reached.

When the auto-bracketing shooting has been completed up to n times, it is determined whether the first stroke of the release button is still being made, and if the first stroke is still being made, the exposure value is The last exposure value calculated by the calculation means 101, that is, the nth auto-bracketing exposure value, is sent from the exposure value calculation means 101 to the display means 104.
The last exposure value is displayed. The exposure value calculation means lO1 calculates the auto-bracketing exposure value for the next shooting based on the previous auto-bracketing exposure value and the level change amount information every time the shooting end signal is input from the shooting number determining unit 106, and calculates the auto-bracketing exposure value for the next shooting. It has the function of outputting to the auto-bracketing photography control means 106.

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

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 D1 connected to a feedback circuit. The operational amplifier OPI outputs logarithmically compressed object brightness information By via the resistor R1. Variable resistor VR1 connected to constant voltage source VGI outputs film sensitivity information Sv. An operational amplifier OP2, whose feedback circuit is connected to a resistor R2, calculates and outputs photometric information Ev=(BY-!-5V).

The photometric information Ev is converted into a 4-bit digital value by the A/D converter ADC, and the microcomputer CO
It is input to input port PGO-PG3 of M.

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

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 1
When the first stroke switch SW1 connected to the input port PAO is turned on by the first stroke of The voltage from Vbat is supplied as a power supply Vcc to circuits that consume a relatively large amount of power, such as photometric operational amplifiers OPI and OF2.

Microcomputer COM input capo) PA1-11
, 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, a charging completion detection switch swCGE that turns on when mechanical charging is completed, and a film switch sw that turns on every time the feeding of one frame of film is completed.
FLM, trailing curtain switch 5wC that turns on when trailing curtain travel is completed
N2, a self-switch 5w5EL that is turned on when the self-timer is set by the operating lever 3;
F, the switch 5wC5, which is turned on when continuous shooting mode is selected by the operating lever 5, and turned off when single shooting mode is selected, the aperture value setting switch swM, and the switch 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-TR2 are connected to the output capacitor (PEONPE2) via resistors RIO-12, and the transistors TR0-TR2 are connected to the first clamping magnet (MG).
It controls the energization of the leading curtain magnet (MCI) that drives the O1 leading curtain and the trailing curtain magnet (MG2) that drives the trailing curtain. Also, resistor R13 is connected to the output ports FD, PC, and FB.
The bases of transistors TR3 to TR5 are connected through transistors TR3 to TR5, transistor TR3 drives charging motor MD, transistor TR4 drives rewinding motor MC, and transistor TR5 winds the film at high speed. The respective drives of the winding motors MD are controlled.

From the output port PTD, the contents of the shutter speed information register RGTv in the microcomputer 700M are output to the decoder TD, and the decoder TD converts the contents into a signal for displaying the shutter speed seconds and outputs it to a liquid crystal display connected to Pa. The signal is output to the display 5EGl, which is configured with:

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

A signal of 1'' or 0 is output from the output port PME to the display 5EG4, which is composed of a liquid crystal, etc.
4 displays a multiple shooting mark when a 1° signal is input.

Output Capo) From PFD, Microcomputer 700M
The contents of the aperture value information register RGAv, the contents of the auto bracketing step information register RGBH, or the contents of the multiplex number information register RGMH are output to the decoder FD. The decoder FD outputs a signal for numerical display corresponding to each of the above-mentioned contents to a connected display device 5EG5 composed of a liquid crystal or the like.

Output Capo) Microcomputer 700M from PAY
The contents of the aperture value information register RGAv are output to the aperture control drive circuit DAY. The aperture control drive circuit DAV is connected to the drive actuator CA.
V, outputs information converted into actual aperture information to, for example, a stepping motor, and drives this to perform appropriate aperture control.

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

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

[Step 1] Suppose the photographer presses the release button l.
Only one stroke is made 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 a “1'° signal from the output port PF, turn on the transistor TRbat, and turn on the power supply Vc.
c is supplied to each part. Next, a photometry timer is started. The photometry timer is used to continuously supply power Vcc for a predetermined period of time after the off signal is input to the first stroke switch swl, so that even if the photographer releases his/her hand from the release button 1, the photometry state continues for a predetermined period of time. It is possible to check the setting information and change the setting information while viewing the display using the exposure mode selection knob 4. Note that this configuration can be easily performed using a hardware timer built into the microcomputer COM.

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

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

[Step 5] Subtract the contents of the shutter information register RGTv, which stores the information set by operating the dial 5, from the contents of the register RGEv, and store the result (aperture information Ay) in the aperture information register RGAv. let It is assumed that the contents of all registers in the microcomputer 00M are held while the battery BAT is loaded. Also, if you load the battery BAT for the first time,
It is assumed that a frequently used value, for example, information such as 1/125 seconds is initially set.

[Step 6: Store the contents of the register RGBH that stores the auto bracket exposure step number information in the aperture bracket 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 101: The contents of the aperture information register RGAv are output from the output port PFD, and the contents of the shutter information register RGTv are output from the output port PTD. As a result, the aperture value calculated by the calculation is displayed on the display 5EG5, and the set shutter speed time is displayed on the display SEG1.

[Step 11] The second stroke of the release button 1 is performed, and the on signal of the second stroke switch SW2 is determined to determine whether or not the on signal of the second stroke switch SW2 is input to the input capo PAL. If it is not input, return to the start. Also, while the ON signal of the first stroke switch swl is being input, subject 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 to step 4 -> step 12 -> step 13.

[Step 13] From the contents of register RGE v,
The contents of the register RGAv that stores the information set by the operation of the dial 5 and the aperture value setting switch swM are subtracted, and the result is added to the shutter information register RG.
Store it on TV.

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 10 is displayed on the display 5EG5, and the shutter speed calculated by the calculation is displayed on the display 5EG1. Is displayed.

Also, if manual exposure mode is set, step 4 → step 12 → step 1. Proceed 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 SEG 1.

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 or not the photometry timer is in operation. Here, since the photometry timer has been activated in step 2, the process advances to step 22.

[Step 22] It is determined whether the shutter priority mode is set based on the input states of the input ports ppo and ppi. If the shutter priority mode is currently set, the process advances to step 23.

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

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

[Step 81] Output 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 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, an information reading routine associated with the operation of the dial 5 is executed.

[Step 28] The numerical value set by dial operation (contents of register RGH) and aperture value information (contents of register RG
Av contents) and register RG for aperture information again.
Store it in Av. Also, in aperture priority mode, NEX
The aperture value and shutter speed can be displayed on the displays 5EGI and 5EG5 in step 10, as in the case of the shutter speed priority mode.

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

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

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 boat PTD, PFL.

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

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

The program then jumps to the start.

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

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

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

[Step 41] The multiplex photographing switch swME is determined. Similarly, since the multiplex photographing switch SWME has not been operated, the process advances to step 42.

[Step 42] The flag FsME indicating whether or not the multiple shooting switch swME has been pressed is determined. In the initial state of loading the battery BAT and the first stroke switch swl being on, the flag Fs is set in step 9.
Since ME has been reset to 0, the process advances to step 43.

[Step 43] Auto bracket switch SwA
Flag FsAB indicating whether or not a BR pressing operation has been performed
As in the case of step 42, step 9
Since the flag FsME is reset to O,
Step 21 Hejump.

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

Next, from the above state, auto bracket switch swAB
A case will be described in which the pressing operation of R is performed once. When the auto bracket switch swABR is pressed, an on signal is input to the input port PAIL. The program then proceeds from step 40 to step 44.

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

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

[Step 45] Auto bracket switch SwAB
A flag FsAB indicating that R is turned on is set to 1, and a flag FsME indicating that the multiplex shooting switch swME is on is reset to 0.

[Step 46] Output) PTD, PFL.

The outputs of PABR, PME, and PFD are set to 0°, and all displays on the displays 5EGI-3EG5 are turned off.Next, only the output of the output port PABR is set to "I II," and the auto bracket mark on the display 5EG3 is lit. This allows the photographer to clearly know that the auto bracketing mode has been set.

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

[Step 48] Similar to step 23 or step 27, an information reading routine associated with the operation of the dial 5 is executed. In this case, in step 80, if the stage number information is set to 0.5 using the dial 5, for example, ro, s, o.

0.5" and if l is set, r-1,
Three preset auto-bracket photographs will be taken in which the exposure is automatically changed in steps of 0 and IJ. In addition, the above-mentioned "shooting with the number of stops of -0°5.0, 0.54" refers to an exposure value that is -0.5 steps under the standard exposure value calculated by calculation, a standard exposure value, and a standard exposure value. Exposure value that is 0.5 stops over the exposure value, 3
This means that images are taken continuously using different exposure values.

[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 outputted from the output 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 output port PFD is 5 bits, 32 types of data can be sent, so if the aperture value display is Fl, 4 to F32, every 0.5 stop, there are 14 types in total, and auto bracketing. If the display is from 0 to 5 in 0.5 step increments, there are 11 types in total, 30 types in total, and 31 types including blank codes.By adding a certain constant when sending data to the output capo-PFD Decoder F
It is possible to determine which information D belongs to, and it is possible to display appropriate numerical values.

[Step 50] A flag FME 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 swl is input, the program progresses in the order of step 1 → step 2 → step 3 →..., and the flag FsAB is reset to O in step 9, and its display is also In step 10, 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 RGBH
Determine whether the content of
It is necessary to prohibit auto-bracketing because multiple shots are taken and it is meaningless. Therefore, in this case, the process advances to step 53.

[Step 7 53] The flag FABR indicating auto bracket mode is reset to O. Matade Capo) PA
Set the BR 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 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 is now possible.

Further, in step 55, the first stroke switch SW
If it is determined that 1 is off, the exposure calculation in step 56 is not performed because the photometry timer is operating.
The standard exposure value will be displayed in step IO.

Even in this case, since the first stroke of the release button 1 is always made when shooting, step 56 is always passed.
Therefore, there is no problem with auto bracketing photography.

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

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

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

[Step 57] Set the output of PABR to “°0”.
’” to turn off the auto bracket mark display.

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

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

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 bracketing switch swABR is turned on is reset to 0.

[Step 61] Output boat PTD, PFL.

Set the output of PABR, PME, and PFD to "0" and turn off all displays.) Set the output of only PME to 1°, 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, 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 RGMH and the contents of the dial register RG)I, and store the result in the register RGMH again. Since the number of times of multiplexing is an integer, if the resolution of one click of the dial 5 is 0.5 steps, the contents of the dial register RGH are doubled and then added. It is also necessary to prevent the contents of the register RGH from becoming a negative number, but this is omitted here.

[Step 67] The contents of the multiple sheet same month register RGMH are output from the output capo PFD and displayed on the display 5EH5.

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

Next, if the number of times of multiplexing is set once and then the number of times of multiplexing is set to zero (0), it is necessary to cancel the multiplex photography mode and turn off the multiplex photography mark. Since the flag FME is set to 1 in step 8, this program is executed by proceeding to step 68.

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

[Step 69] Flag FME indicating multiple shooting mode
Reset to 0. Also, set the PME output to “0”.
’° and turn off the multiplex 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 PMH to "l" and display the multiple shooting mark. This is step 30
To turn off all the displays, press the first release button L 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 1 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 it is auto bracket mode, go to step 101.
Otherwise, proceed to step 102.

[Step 101] Set the output of output port PFL to 1+
1 II and make the auto bracketing mark blink on display 5EG2. 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 capo-1-PAV. This results in
The aperture control drive circuit DAY is the register RGAv.
The content of is converted into actual aperture information, and aperture control is started via an aperture drive actuator CAM such as a stepping motor.

[Step 105] A pulse signal is output from the output port PEO, and the transistor TRO is turned on to energize the mirror-up magnet MGO, which is the tx 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 port PEI, the transistor TRI is turned on, and the shutter front curtain magnet 1-MCI is energized. This causes the shutter front curtain to run.

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

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

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

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

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

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

[Step 114] Set the output of output port PAV to “0”
This returns the aperture to its open state.

[Step 115] Set the output of the output port 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 RGMH again.

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

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

[Step 120] Start a timer for transporting the film. Also, the output of the output port PB is set to "l II,"
The transistor TR5 is turned on to rotate the film feeding motor MB.

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 charging completion detection switch swCGH is input to the input boat PA3. If the on signal is not input, that is, charging is not completed, proceed to step 123. , when charging is completed, the process proceeds to step 122.

[Step 122] Since charging is completed, the output of the output capo-PD is set to "O11" and the charging motor MD is set to "O11".
Cut off the power to.

[Step 123] A switch s wF that is turned on every time one frame of film is fed to PA4 (input capo) It is determined whether or not the LM on signal is being input.If the on signal is not being input, that is, the film l If the feeding of the pieces is not completed, the process proceeds to step 124, and when it is 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, the above sequence (step 121→step 123) is repeated.

[Step 125] When Stella 7'123 detects that the switch swFLM off signal has been input,
The output of the output port PB is set to OII, and the transistor TR
5 is turned off to stop the film feeding motor MB.

[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 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 RGAy again.

Also, the contents of the shutter bracket stage number register GRBT are subtracted from the contents of the shutter time information register RGTv, and the result is stored in the register RGTv again. Here the seventh
Similar to step 56 in the figure, the same program can be used for shutter priority, aperture priority, and manual exposure modes.
This is because the contents of T have been changed. It is clear from this arithmetic expression (subtraction formula) that the second shooting will result in standard exposure, and the third shooting will result in overexposure.

[Step 129] The contents of the registers RGAv and RGTv are output from the output ports PFD and PTD, and the shutter speed information and aperture value information at this time are displayed.

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

[Step 131] A flag FABR indicating auto bracketing mode is reset to 0. Also output port PF
Set the output of L to "0°'" and turn off the flashing display of the auto bracket mark.

The program then returns to start and enters standby mode.

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

[Step 132] Based on the on/off state of the switch 5wC5 input to the input camera (capo) PA7, it is determined whether the mode is a quick shot mode or a single shot mode. A pressing operation is performed, and the first. 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] Set the output of output port Pc to 1°'
Then, 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 the film is rewound. After that, when all the films are wound up in the cartridge, for example, the cartridge stops rotating and the state of the film switch swFLM no longer changes. If this is detected, the process proceeds to step 154.

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

[Step 155] A flag FABR indicating auto bracketing mode is reset to 0. Also output 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 the auto bracketing mode at the same time. Looking at this in the flowchart of Figure 9, when the film ends after the auto bracketing mark is displayed blinking in step 101, Automatically moves to film rewind. While this film rewinding is being executed, the flashing display of the auto bracket mark has not yet been canceled. Therefore, 1. The auto bracketing mark, which normally would not be displayed, is displayed during film rewinding, allowing the photographer to know that the film has ended before auto bracketing has finished completely. be able to.

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

According to this embodiment, before auto bracket shooting, the exposure information for the first frame is displayed by the first stroke of the release button (steps 6 to 10), and from this state, the exposure information for the first frame is displayed.
While the stroke is stopped and the metering timer is operating, the exposure information for the second frame is displayed (step 56 -> step 8 -> step 9 -> step 10), and the first stroke is maintained even after auto bracket shooting is completed. If it remains the same, display the exposure information for the third frame (step 128).
→ Step 129 → Step 104... Step 130) All exposure information is displayed, so you can perform auto bracketing after checking the subject conditions. can. Furthermore, since the display is configured to be displayed outside of auto-bracket photography, exposure information for each frame can be checked without being subject to time constraints.

(Modification) In this example, under exposure information, standard exposure information,
Although three shots are taken using each exposure information (over exposure information), the invention is not limited to this; for example, standard exposure information, first over exposure information, and second over exposure information are used. This may be performed using each exposure information such as exposure information, or each exposure information such as first underside exposure information, second underside exposure information, standard exposure information, or the like.

In addition, in this embodiment, 3
Although it is not limited to this, it is not possible to see all the auto bracketing exposure values in this case, but you can see the exposure values for at least 3 frames, so it is approximate. After careful consideration, there are almost no problems.

(Effects of the Invention) As explained above, according to the present invention, the first auto-bracketing exposure value is displayed by the first stroke of the release button before auto-bracketing shooting, and by canceling the first stroke of the release button. Displays the exposure value based on photometric information,
After shooting with the nth autobracketing exposure value, the first stroke of the release button is held, so that n
A display means for displaying the first and nth auto-bracketing exposure values and the exposure value based on the metering information is displayed in accordance with the state of the first stroke of the release button for auto-bracketing shooting. Since it is displayed for a relatively long period of time except during execution, the photographer can confirm the main exposure values related to auto bracket photography as needed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart thereof, and FIG. 3 is a microcomputer disposed in a camera incorporating the embodiment shown in FIG. 4 is a front view of the camera, FIG. 5 is a top view, FIG. 6 is a back view, and FIGS. 7 to 9 are flowcharts. ■00000. Release button, 2.3...Operation lever, 4...Exposure mode selection knob, 5...
...Dial, 6...Switch cover, 7...
...Storage section, swABR...Auto bracket switch, swME...Multiple shooting switch,
COM・・・Microcomputer, TD, A
D, FD...decoder, 5EGI~5EG5
... Display device, DIF ... Dial interface circuit, MB, MC, MD ... Motor, 101 ... Exposure value calculation means, 103 ...
. . . Level change amount storage means, 104 . . . Display means, 105 . . . Auto bracket photographing control means, 106 . . .

Claims (1)

[Claims] (1) Exposure value calculation means that calculates an exposure value from input photometric information and calculates the first to nth auto-bracketing exposure values based on the exposure value; an auto-bracketing control means for sequentially changing to an n-th auto-bracketing exposure value and performing n shots; and a first auto-bracketing exposure value displayed by a first stroke of a release button before auto-bracketing. , when the first stroke of the release button is released, the exposure value based on the photometry information is displayed, and after the shooting with the nth auto bracketing exposure value is completed, the first stroke of the release button is held and the nth auto bracketing is started. An exposure control device for a camera, comprising: display means for displaying an exposure value.