JPS6337324A - Exposure control device for camera - Google Patents

Abstract

PURPOSE:To execute auto bracket photographing by only executing simple operation, by providing a photographing frequency fixing means for ending the auto bracket photographing control means, when an auto bracket photographing frequency reaches to a prescribed frequency which is fixed. CONSTITUTION:When the first auto bracket photographing is ended, a charge operation of each mechanism, etc., is executed, and subsequently, whether an auto bracket mode is set or not is discriminated again. In such a case, since the auto bracket mode is set, an auto bracket photographing control means 103 continues the continuous photographing in accordance with an auto bracket exposure value inputted from an exposure value arithmetic means 101 at every photographing until it is detected that an auto bracket photographing frequency has reached a frequency (n) which is fixed by a photographing frequency fixed means 105. The photographing frequency fixing means 105 is constituted of a counter means 106 for counting a photographing frequency by the auto bracket photographing, and a detecting means 107.

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 relative to the shutter speed and aperture value set by the photographer.More simply, 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 performing auto-bracketing on a conventional camera of this type, it is necessary to determine how many underexposures to the standard exposure value and at what exposure level range (for each frame during auto-bracketing). It was necessary to set information about how many frames to photograph (changes in exposure level) and how many frames to photograph. In other words, three parameters had to be set.

In addition, in modes that are rarely used, such as auto bracket mode, arranging separate operation members for each mode would be problematic in terms of space and cost.
By using it in combination with other operating members, we tried to avoid manufacturing problems as much as possible. However, the photographer is forced to follow extremely complicated operating procedures, leading to problems such as operational errors and failure to memorize the operating procedures.

(Object of the Invention) The object of the present invention is to solve the above-mentioned problems and enable auto-bracketing photography by simply performing simple operations! An object of the present invention is to provide an exposure control device for a camera that can produce shadows.

(Features of the Invention) In order to achieve the above object, the present invention is provided with a number-of-shooting fixing means that causes the auto-bracketing control means to end auto-bracketing when the number of auto-bracketing shots reaches a fixed predetermined number; This prevents the photographer from freely setting the number of auto bracket shots.
The feature is that only the exposure level change stitch can be set during auto bracket shooting.

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

When the first stroke operation of the release button is performed, the exposure value calculation means 101 determines whether or not the mode is 0-order auto bracketing mode, in which the standard exposure value is calculated based on the input camera photometry information, and In the case of bracket mode, the exposure value operator stage 101 changes the exposure level set by the level change setting means 102. That is, it reads the step number information for changing the exposure level, calculates the exposure value to be used for the first auto bracketing shooting based on the step number information and the standard exposure value, and outputs the calculation result to the auto bracketing shooting control means 103. At the same time, the information and the standard exposure value are stored in the exposure value storage means 104.

Thereafter, when a release operation (second stroke) of the release button is performed, the auto bracket shooting control means 103 configures the diaphragm based on the first auto flash output value inputted from the exposure value calculation means lO1. Controls the shutter mechanism, etc.

Start auto bracket shooting. When the first auto-bracketing photograph a-shade is completed, the various mechanisms described above are charged, and then a determination is made again as to whether or not the auto-bracketing mode is set. Auto bracket mode is set here, so auto bracket lIl! The shadow control means 103 is the shooting number fixing means 1
Continuous photography is continued in accordance with the auto-bracketing exposure value input from the exposure value calculation means 1O1 for each IM shadow until it is detected in step 05 that the number of auto-bracketing shots has reached the fixed n times.

The number of shots fixing means 105 includes a counter means 106 for counting the number of shots taken in auto bracket shooting, and the exposure value calculating means 101 until the counted value of the counter means 106 reaches a preset n number of times. a detection stage 107 which outputs an instruction signal to calculate the next auto-bracketing exposure value, and outputs a stop signal to the auto-bracketing control means 103 upon detecting that n times have been reached. Ru. Further, when the exposure value calculation stage lot receives an instruction signal from the detection means 107 to calculate the next auto-bracketing exposure value,
The previous auto bracketing exposure value and standard exposure value stored in the exposure value storage means 104 are stored in the lfv 41 output 1. (7) Calculate the auto bracket exposure value, output the calculation result to the auto bracket shooting control means 103 again, and store the information and the standard exposure value again. , such an operation (n-1
) times.

In the embodiment shown in FIG. 1, a single release operation causes auto bracket shooting to be performed a fixed number of times in succession, and a stop signal is output when the fixed number of times is detected to stop auto bracket shooting. However, while automatically changing the exposure value each time the release operation is performed,
The configuration may be such that auto-bracketing is executed a fixed number of times.

FIG. 4 shows the arrangement of each operating member when the camera incorporating the device embodying the embodiment shown in FIG. 1 is viewed from the front.
Figure 5 shows the arrangement of each operating member when viewed from above, and Figure 6 shows the arrangement of each operating member when viewed from the back.
In Figures 4 to 6, ■ indicates the release button, and 2 indicates continuous shooting (C).
or a control lever for selecting the shooting mode of single shot (S); 3 is a control lever for selecting the self-timer;
4 is an exposure mode selection knob that selects the exposure mode of shutter priority (Tv), aperture priority (Ay), or manual (M), and 5 is shutter speed, aperture value, or exposure step number information during auto bracket shooting. (For example, information for every 0.5 step or 1 step)': Used when setting J 1 For example, a so-called electronic dial equipped with 2-bit conductive patterns and brushes that are 90 degrees out of phase with each other, s
wM 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 rarely used switches, swABR an auto bracket switch stored in the storage section 7, and swME a multiplex shooting switch also stored in the storage section 8'87. 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 OPi whose feedback circuit is connected to a compression diode DI. The operational amplifier OPI outputs logarithmically compressed object brightness information By via the resistor R1. o connected to constant voltage source VGl
The f-variable resistor VR1 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 then sent to the microcomputer COM.
is input to the human power port PGO-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 human-powered ports PH0-PO2 of the microcomputer COM. . The information in the dial interface circuit DIF is a pulse signal that is output from the microcombination COM; t'-
It is reset by input from PE3. Depending on which mode is selected by the exposure mode selection knob 4, two exposure mode switches 5w5EL are turned on and off, and 2-bit information corresponding to the selected exposure mode is sent to the microcomputer COM+7) input port Pro-.
Input to PPI.

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 strokeless switch Swl connected to the input port PAO is turned on by the first stroke of
is turned on, and the voltage from the power supply Vbat is supplied as the power supply Vcc to circuits that consume a relatively large amount of power, such as the photometric operational amplifiers OPI and OP2.

Microcomputer COM input port PAIN11
The second stroke switch SW2 is turned on by the second stroke of the release button L, and turned off by raising the mirror.
Mirror up switch swM that turns on when the mirror is down
RUP, Jl Charge completion detection switch swCGE, film l 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 a snapshot mode is selected by the '99 lever 5, and turned off when a funeral photo mode is selected, the aperture value setting switch swM, and the switch lid 6 are closed. Switch 5w5ET turns off when opened and turns on when opened.
, the multiplex photography switch swME, and the auto bracket switch swABR are connected to each other.

The bases of transistors TR0-TR2 are connected to the output ports PEO-PE2 via resistors RIO-12, and the transistors RO-TR2 are connected to the tZ constant 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.

Microcomputer 00M from PTD
The contents of the shutter speed information register RGTv are output to the decoder TD, and the decoder TD converts the contents into a signal for displaying the shutter speed seconds, and sends this signal to the connected display 5EGl, which is composed of a liquid crystal or the like. Output.

Output ports PFL and PABR output a signal of "1" (meaning high level) or 0° (meaning low level) to decoder AD, and decoder AD receives a signal of "l" from output port PFL. If it is input, a signal for displaying the auto bracketing mark blinking is output to the connected display device 5EG2 made up of a liquid crystal or the like. When a signal 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 “O゛°” is output from the output port PME to the display device 5EG4 composed of a liquid crystal or the like, and the display device 5
When the signal "1" is inputted to the EG4, a multiple shooting mark is displayed.

From the output port PFD, the microcomputer 00M
The contents of the aperture value information register RGAv, the contents of the auto bracketing step information register RGBH, or the contents of the multiplex number information register ROMH are output to the decoder FD. The decoder FD outputs a signal for numerical display corresponding to each of the above-mentioned contents to a connected display device 5EG5 composed of a liquid crystal or the like.

From the output port PAY, the contents of the aperture value information register RGAv in the microcomputer 00M are output to the aperture control drive circuit DAY. The aperture control drive circuit DAY is connected to the drive actuator CAV.
For example, the information converted into actual aperture information is output to a stepping motor or the like, and this is driven to perform appropriate aperture control.

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

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

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

[Step 2] Output the “L” signal from the output port PF, turn on the transistor TRbat, and turn on the power supply Vcc.
Then, the photometry timer is started. The photometry timer is for continuously supplying the power supply Vcc for a predetermined period of time from the input of the off signal to the first stroke switch swl.

This allows the photographer to check the photometry state for a predetermined period of time even after releasing the release button 1, and to change the setting information while viewing the display using the exposure mode selection knob 4. Note that this configuration can be easily performed using a hardware timer built into the microcomputer COM.

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

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

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

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

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

Assuming that multiple shooting mode is not currently set.

Proceed to step 9.

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

[Step 10] The contents of the aperture information register RGAv are output from the output port PFD, and the contents of the shutter information register RGTv are output from the output port PTD. As a result, the aperture value calculated by the calculation is displayed on the display 5EG5, and the set shutter speed time is displayed on the display SEG1.

[Step 11] The second stroke of the release button 1 is performed, and it is determined whether or not the on signal of the second stroke switch sw2 is input to the input capo FAI.
Assuming that the on signal of the younger 2-stroke switch SW2 is not input, the process returns to the start. Further, while the ON signal of the first stroke switch swl is being input, calculation information can be obtained from the subject brightness information, film sensitivity information, and setting information by this routine, and these information can be displayed.

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

[Step 13] From the contents of the register RGEv, calculate the contents of the register RGAv, which stores information set by operating the dial 5 and the aperture value setting switch swM, and send the result to the shutter information register RGT.
Store it in v.

It is assumed that when the battery BATt is loaded for the first time, a frequently used value, for example, 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 shear 2 tab bracket stage number register RGBT. Also, the contents of the register RGBA for the number of aperture rebracketing stages are set to zero.

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

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

[Step 15] Register RGTM that stores the shutter speed information set by operating the dial 5
The contents of are stored in the shutter information register RGTv. This is because when auto flashing (41 shadow) is set in manual exposure mode, the contents of register RGTv change every time a photo is taken.

This is to store the information set by operating the dial 5 as is, and the details will be described later.

After that, the same sequence as in the aperture priority mode is followed, and the aperture A1 set in step IO is displayed on the display 5EG.
5, the set shirt time is displayed on the display 5EGI.

Next, we will describe information setting by dial operation while the photometry timer is operating. When the depression (first stroke) of the release button 1 is stopped during the above-described sequence, the off signal of the first stroke switch 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: fi6 remains closed, the off signal of the switch 5w5ET is input to the human-powered boat PA9, so the process proceeds to step 21.

[Step 21] It is determined whether the l1111 optical timer is in operation or not. Since this is just after the photometry timer has been operated 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 80] The information input to the input port PI (O-PH3) is stored in the dial register RGH. At this time, the register RGH contains a numerical value corresponding to the number of clicks on the dial 5, and a value corresponding to the number of clicks on the dial 5. Information about whether the numerical value is positive or negative is stored depending on the direction of rotation.II!II, 4-bit information indicating how many steps to shift up or down from the current information is stored.

[Step 811 Output the pulse signal of the output boat 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 the register RGH) and the shutter information (the contents of the register RGTv) are added, and the result is stored again in the shutter information register RGTv.

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

[Step 25] It is determined whether or not a certain code indicating a valve mode located next to the maximum second hour of the shutter speed is stored in the register RGTM.If the current valve mode is not present, the process goes to NEXTl. Step 3
Hejyump.

In this way, during the photometry timer after the press of the release button L (first stroke) is stopped, the setting information can be changed by operating the dial 5, and then the routine from step 3 described above is executed. By doing so, the aperture value and shutter speed time are displayed on the display 5EGI in step IO.
To 5EG5.

Each can be displayed.

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 the shutter speed can be displayed on the displays 5EGI and 5EG5 in step 1O, as in the case of the shutter speed priority mode.

If the macro exposure mode is set, the process proceeds to step 22 -> step 26 -> step 29.

[Step 29] Distinguish whether the aperture value setting switch swM is on or off (7g). In the manual exposure mode, operate the aperture value setting switch swM and operate the dial to set the aperture fIi. Since the shutter speed is configured to be changeable, when the switch swM is on, the same routine as in the aperture priority mode is performed (step 27).
When the shutter priority mode is off, the process advances 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 301 Output boats PTD, PFL.

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

[Step 311 Similar to step 9, the flag FsAB indicating whether the auto bracketing switch swABR has been operated or not and the flag FsME indicating whether the multiple shooting switch swME has been operated are both reset to 0.

The program then jumps to start.

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

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

[Stay, Bu 401 Auto bracket switch Sw
Since the switch M6 for determining the ABR has just been opened and the auto bracketing switch 5WABR has not been operated, the process advances to step 41.

[Step 411: The multiplex photography switch swME is determined. Similarly, since the multiplex photography switch swME has not been operated, the process advances to step 42.

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

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

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

Next, from the above state, auto bracket switch swAB
A case where the R suppression operation is performed once will be described. When the auto bracketing switch s wABR is pressed, an on signal is manually input to the input boat PAll. The program then proceeds from step 40 to step 44.

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

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

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

[Step 46] Output boats PTD, PFL.

Set the outputs of PABR, PME, and PFD to "o" and turn off all the displays on display SEG l-3EG5. Next, set only the output of output port PABR to "l" and turn off the display on display 5E.
Light up the G3 auto bracket mark. This confirms that the auto bracketing mode is set.
J1 The photographer can definitely know.

[Step 47] Set a flag FABRt-1 indicating that auto bracketing mode has been set.

[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, if the step number information is set to 1, for example 0.5 by the dial 5 in step 80, then the step number is r-0,5,0°0.5'', and if l is set, r Exposure was automatically changed in steps of -1, 0, and IJ. Three preset auto bracket shots will be taken. Nao Moeki “-〇.

Shooting with a number of steps of 5.0 or 0.54 means an exposure value that is -0 or 5 steps under the standard exposure value calculated by calculation, a standard exposure value, or 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 add 1 degree register R
Store it in GBH. As mentioned above, the minimum resolution by one click of the dial 5 can be set freely in increments of 0.5 steps or in increments of 1 step. Note that if the resolution is different from the shutter speed and the aperture value, a program that multiplies the contents of the register RGBH by an integer may be inserted, and a detailed explanation will be omitted here since it is not related to the actual situation. Further, the contents of the register RGBH are outputted from the output port PFD, and the 1 display 5EG5 displays a numerical value indicating the number of stages, for example rO, 5J. 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 O to 5 and every 0.5 steps, 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 port PFD, the decoder F
It is possible to determine which information D is, and the appropriate numerical display is the rotation.

[Step 501: Determine flag FMH indicating whether multiple photography mode is set. If multiple photography mode is not set, return to 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 the number of times for multiple shots is arbitrary.
Even if it is set to a, it is set to high M three times to prevent the photographer from making mistakes.

+n In order to eliminate the risk of A output, the program returns to the start in the 0th order. 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 43→Step 48
, the photographer can continue to maintain the auto bracketing step number change mode with dial 5, and the photographer can press switch swA.
It becomes possible to operate the dial 5 while the BR suppression operation is stopped.

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

Alternatively, this can be done by closing the switch lid 6 and turning off the switch 5w5ET. In other words, when the ON signal of the first stroke switch swl is input, the program progresses in the order of step l → step 2 → step 3 →...
The flag FsAB is reset to O in step 9, and its display is also switched to a normal display in step 10. Further, when the off signal of the switch s wSET is input, the auto bracket mark display disappears at step 30 in the program progressing from step 20 → step 21 → step 30 → step 31, and the step 31 flag FsA
B is reset and the process does not proceed to the auto bracket stage number change mode again.

Next, exposure calculation in auto bracket mode and mode will be explained. For shutter priority mode.

As mentioned in step 6, the bracket stage number register RG
The contents of BH are stored in the aperture bracket stage number register RGBA, and in the case of shutter priority mode and manual exposure mode, in the shutter bracket stage number register RGBT as described in step 14. In step 7, it is auto bracketing mode and flag FAB
Since R is set to 1, the process advances to step 52.

[Step 52] Bracket stage number register RGBH
Determine whether the content of
Since multiple shots are taken, it is meaningless, so it is necessary to prohibit auto bracket shooting. Therefore, in this case, the process advances to step 53.

[Step 53] A flag FABR indicating auto bracketing mode is reset to O. Also output boat 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 reference flag FsAB is reset to 0, and a normal routine is executed.

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

[Step 541 Set the output of the output boat PABR to “1”
and display the auto bracket mark. This is when the switch swS'ET is turned off by closing the switch cover 6 from the auto bracket mode setting state.
This is because 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.

[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 561: Add the contents of the aperture information register RGAv and the contents of the aperture bracket stage number register RGBA, and store the result in the register RGAv again. Also, the contents of the shutter information register RGTv and the contents of the shutter bracket stage number register RGBT are added, and the register RG is added again.
Store it on TV. This means that the aperture information calculated in the shutter priority mode and the shutter speed information calculated in the aperture priority mode are changed in accordance with the number of autobracket stages. In other words, if the autobracketing step number is set so as not to be a negative number at step 49, the value after the calculation at step 56 will be an exposure value on the under side of the standard exposure value. In addition, in manual exposure mode, the same step 14 as in aperture priority mode is passed, so the shutter speed is changed, and the aperture is not changed as in conventional cameras, so exposure with a constant depth of field is possible. 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.
The standard exposure value will be displayed in step IO.

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. Inside, standard exposure A1 will be displayed. As a result, the photographer can easily recognize the exposure value of auto bracketing.

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

Bracketing in bulb photography is basically useless, 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 7-lag FABR in auto bracket mode to 0.

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

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

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

[Step 61] Output port PTD, PFL.

Set the outputs of PABR, PME, and PFD to "θ", turn off all displays, set the output of only output port PME to "°l", and set the multiple shooting mode mark to 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 641 Since it is auto bracketing mode, similarly to step 51, the number of multiple shots is forcibly set to 3, that is, the contents of the multiple shots number register ROMH 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 register RGME for the number of times of multiplexing and the contents of the dial register RGI (and store it again in the register ROMH. Since the number of times of multiplexing is an integer, if the resolution of one click of the dial 5 is 0.5 If it is a stage, then the contents of the dial register RG)I are
It will be multiplied and then added. Also, the register R'G
It is also necessary to ensure that the content of H does not become a negative number,
It is omitted here.

[Step 67] The contents of the frequent use register RGMH 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 switch swME is input thereafter, the process continues from step 41→step 42→ Proceeding to step 63, it becomes possible to maintain the multiple shooting number setting mode. To shift from auto bracketing step number change mode to multiple shooting setting mode, just turn on the switch swME once,
It is also clear from the flowchart in FIG. 7 that the reverse transition can be accomplished by turning on the switch swABR once.

Next, if the number of times of multiple shooting is set once and then the number of times of multiple shooting is set to zero (0), it is necessary to cancel the multiple shooting mode and turn off the multiple 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, the output of output port PME is set to “O”.
oo and turn off the multiple shooting mark display.

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

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

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 manually applied to the 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 toll output capo] Set the PFL output to “l”
", and the auto bracketing mark on the display 5EG2 is displayed blinking. This allows the photographer to reliably know that auto bracketing photography has started.

[Step 102] Determine whether or not the ON signal of the self-switch 5ELF is manually input to the PA 6. If the ON signal is input, it means that self-timer photography is being performed, and the process goes to Step 103. Otherwise, the process goes to Step 103. If so, proceed to step 104.

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

[Step 104] The contents of the aperture information register RGAy are output from the output port PAY. Thereby, the aperture control drive circuit DAY 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 capacitor (PEO), and the transistor TRO is turned on to energize the mirror-up magnet (MGO), which is the first combination magnet.

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

[Step 106] It is determined whether or not the on signal of the switch swMRUP, which detects the completion of mirror up, is manually input to the input boat PA2.Here, it is determined whether the on signal is input manually, that is, the mirror is completely raised. This loop is repeated until the image is completely uploaded, and the process proceeds to step 107.

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

[Step 108] A pulse signal is output from the output port PEl, and the transistor TRI is turned on to energize the shutter front curtain magnet MGI. This results in
The shutter front curtain runs.

[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 Ill.

[Step 110] Wait for the off signal of the second stroke switch SW2 to be input. Since this is the valve mode, it is necessary to keep the shutter open while the on signal of the second stroke switch SW2 is input manually. This is because there is.

[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 output port PE2.

The transistor TR2 is turned on to energize the shutter rear 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 operation of the shutter rear curtain is completed until the ON signal is input. This loop is repeated until the process is completed, and then the process proceeds to step 114.

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

[Step 115] Set the output of output capo-1-PD to “1”
'', the transistor TR3 is turned on, and the charging motor MD for mirror down and shutter charging is rotated.

[Stave 116] It is determined whether the multiple shooting mode is set or not based on the state of the flag FMH. If it is the multiple shooting mode, the process proceeds to step 117; otherwise, the process proceeds to step 120.

[Step 117] Subtract 1 from the contents of the multiplexing number register RGME and store it in the register RGME 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 output of output port PME to “O”,
Turn off the multiple shooting mark display.

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

If the multiplex shooting mode is continued, the contents of the multiplexing number register ROMH are not zero, so the process advances from step 118 to step 121, and since step 120 is not passed, film feeding is not performed.Therefore, multiplex shooting is not performed. It will be done. Further, when the multiplex photography is completed, the contents of the register RGMH become zero, so the film is fed in step 120 after canceling the multiplex photography mode as described above.

[Step 1211] Determine whether or not the ON signal of the charge completion detection switch F-3WCGH is input to PA3. If the ON signal is not input, that is, charging is not completed. Step 12
The process proceeds to step 3, and when charging is completed, the process proceeds to step 122.

[Stave 122] Since charging is completed, the output of the output port PD is set to “O” and the charging motor MD is turned on.
Cut off the power to.

[Step 1231 Determine whether or not the on signal of the switch SWFLM, which is turned on every time one frame of film is fed to the manual boat PA4, is manually input. If the on signal is not input, that is, the feeding of one frame of film is completed. If not, proceed to step 124, and if completed, proceed to step 1.
Proceed to 25.

[Step 124] Determine the state of the film feeding timer. When the film is finished, no more film feeding occurs, so the switch swFLM is not turned on, and in such a case, the timer for film feeding, which is, for example, a one-second timer, finishes counting. When the time measurement is completed, proceed to step 150, otherwise proceed to step 1
21 and repeats the aforementioned sequence (step 121→step 123).

[Stay, pull 125] Switch s at stay 2 block 123
When it is detected that the off signal of wFLM has been manually input, the output of the output port PB is set to "0" and the transistor TR5 is turned off.
is turned off to stop the film feeding motor MB.

[Step 126] It is determined whether the auto flag -/) mode is set or not based on the state j6 of the flag FABR. Step 1 if not in auto bracketing mode
If yes, proceed to step 127.

[Step 1271 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 value: under, standard, and over. If the shooting is not 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 flashet \St number register GRBT are subtracted from the contents of the shutter seconds information register RGTv, and the result is stored in the register RGTv again. Similar to step 56 in FIG. 7, the same program can be used for shutter priority, aperture priority, and manual exposure modes.
This is because the contents of GBT have been changed. It is clear from this arithmetic expression (subtraction formula) that the second shooting will result in standard exposure, and the third shooting will result in overexposure.

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

The program then jumps to NEXT2, step IO4. 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 input manually or not. If the off signal is not input at this time, step 128
．． The calculated display can be viewed in step 129. In other words, the final overexposure value can be confirmed at this time. Therefore, since the underexposure value of 1-1 was seen once 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 displayed in the shooting sequence. It becomes possible to confirm. 1st stroke switch sw
When the second off signal is input, the process advances to step 131.

[Step L31] A flag FABR indicating auto bracketing mode is reset to O. Also output boat PF
Set the output of L to "O" 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 O, the process advances from step 126 to step 132.

[Step 132] The i! In the case of the 1-shot mode, the process returns to the start, in which case the release button 1 is suppressed, and the 1st. 2nd stroke switch swl, 2
Since the on signal has been input, the next shooting begins. In the case of single shooting mode, the process advances to step 133.

↓Step 133] Wait for the off signal of the first stroke switch SW2 to be input. Since this is single shooting mode, the next shooting sequence will not proceed unless the photographer stops suppressing the release button 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 the output boat PC to “t”
” and turns on the transistor TR5 to rotate the rewind motor MC. As a result, rewinding of the film is started.

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

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

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

As can be seen from the above, step 152. The process proceeds through the loop of step 153, and when the completion of feeding of one frame is detected, the process proceeds from step 152 to step 151, and this loop is repeated when rewinding the film. After that, when all the films are wound up in the cartridge, for example, the cartridge stops rotating and the state of the film switch swFLM no longer changes. If this is detected, the process proceeds to step 154.

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

[Step 155] The flag indicating auto bracketing mode is reset to FABRt-0. Also output boat PF
Set the L output to “O゛°” and turn off the flashing auto bracket mark.

The program then returns to the start.

Also, during auto bracket shooting, in other words,
If you have to take multiple shots in a row but the film ends midway through, repeat step 1 at the 1st or 2nd frame.
It enters the routine after 50. In such cases, if auto bracketing continues with the newly loaded film, there is a risk that the subject may be different or the photographer may misunderstand, so at the same time, the photographer should be informed of this. It is desirable to cancel the auto-bracketing mode. Looking at this in the flowchart of Figure 9, after the auto-bracketing mark flashes in step 101, when the film ends, the process automatically shifts to film rewind. do. While this film rewind is in progress, the flashing display of the auto bracket mark has not yet been canceled. Therefore, the auto bracket mark, which would not normally be displayed, is displayed during film rewind. The photographer can know that the film has ended without the auto bracket shooting being completely completed.

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

According to this embodiment, the number of auto-bracketing shots is set in advance to three in the camera, and the same level of under- and over-exposure is obtained from the camera's photometric output and film information. Since the photographer only has to set the values that serve as side exposure information, setting of each information necessary for auto bracketing becomes extremely easy.

(Effects of the Invention) As explained below, according to the present invention, the number-of-shooting fixing means is provided for terminating the auto-bracketing shooting by the auto-bracketing shooting control means when the number of auto-bracketing shots reaches a predetermined fixed number of shots. In preparation, the number of auto bracket shots cannot be set freely by the photographer, and only the amount of change in exposure level during auto bracket shooting can be set, so auto bracket shooting can be done simply by performing multiple operations. can be executed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart thereof, and FIG. 3 is a microcomputer disposed in a camera incorporating the embodiment shown in FIG. 4 is a front view of the camera, FIG. 5 is a -F side view, FIG. 6 is a back view, and FIGS. 7 to 9 are flowcharts. l...Release button, 2, 3...Operation lever, 4...Exposure mode selection knob, 5...
...Dial, 6...Switch cover, 7...
...Storage section, swABR...Auto bracket switch, swME...Multiple shooting switch,
COM・・・Microcomputer, TD, A
D, FD...Decoder, SEG l~5EG
5... Display, DIF... Dial interface circuit, MB, MC, MD...
Motor, 101... Exposure value calculation means, 102.
...Level change amount setting means, 103...
Auto bracket shooting control means, 105... Shooting number fixing means.

Claims (1)

[Claims] (1) Level change amount setting means for setting the amount of change in exposure level in auto bracket shooting, and exposure value calculation means for calculating an exposure value for each auto bracket shooting based on information from the level change amount setting means. , an auto-bracketing photography control means for sequentially performing photography using the exposure value by the exposure value calculation means; and an auto-bracketing photography control means for terminating the auto-bracketing photography by the auto-bracketing photography control means when the auto-bracketing photography count reaches a fixed predetermined number of times. An exposure control device for a camera, comprising a fixing means.