JPS6236646A - Device for setting up exposure control data for camera - Google Patents

Abstract

PURPOSE:To attain a manual setting based upon a simple constitution by switching a current mode to an automatic exposure control mode by the switching of an allowable position of a main switch at the operation of a manual operation member to fix an exposure time on a prescribed value. CONSTITUTION:When the main switch S0 of a camera is closed, the interruption terminal INT of a microcomputer 11 is turned to 'L' and interrupted and he microcomputer 11 runs an INT routine and blocks other interruptions during the execution of the routine. When deciding that all switches S1, S2, Sa are opened, the input terminal IP1 resets a flag MF and discriminates whether switches Su, Sd are closed or not, and when the switch Su is closed, sets up shutter speed to 1/250sec. If the SD is closed, the input terminal IP1 sets up the flag MF as a value. Consequently, the shutter speed is fixed on a set point and a manual mode setting up a diaphragm in accordance with the operation of an UP/DOWN key can be set up.

Description

Detailed Description of the Invention The present invention relates to a camera that has an automatic exposure control mode that performs automatic exposure control based on photometric values, and particularly relates to a camera that has an automatic exposure control mode that performs automatic exposure control based on photometric values, and particularly relates to a camera that has an automatic exposure control mode that performs automatic exposure control based on photometric values, and in particular This invention relates to a camera that allows manual exposure control using set values.

Imitate me! Moon (9) - A camera with an automatic exposure control mode is convenient for beginners who are not familiar with cameras, and it is desirable to have fewer operating members in order to make the shooting operation simple and easy for beginners to understand. , even in such cameras, it is possible to manually set exposure control data under specific shooting conditions (for example, frequently used exposure times such as flash synchronization limit speed, pulp shooting where arbitrary long exposure is easy, etc.). It is desirable to be able to take pictures because the range of use of the camera is expanded.In this case, it is necessary to provide a dedicated operating member for manual settings, which complicates the configuration of the camera.

The present invention provides an exposure control data setting device that allows manual exposure control with a simple configuration when performing manual exposure control with a camera that has an automatic exposure control mode. It is about providing.

In the present invention, the main switch is switched from a prohibition position where the camera's metering and exposure control operations are prohibited to an enable position where the above operations are permitted, and the exposure time and exposure time are controlled by the subsequent operation of the manual operation member. In a camera that has an automatic exposure control mode in which the combination of aperture values that results in proper exposure is changed, there is a discriminator that determines when each of the main switch and manual operation member is operated, and a main switch that allows the operation of the manual operation member. The invention is characterized by comprising data setting means that is activated when the exposure control mode is switched to the manual exposure control mode and fixes the exposure time to a predetermined value.

1. In other words, by using the determining means to determine the timing of each operation of the main switch and the manual operation member, when the manual operation member is operated after the main switch is operated, the automatic exposure control mode is set, and the manual operation is activated. When the main switch is operated while operating the operating member, a manual exposure control mode is entered and the exposure time is fixed at a predetermined value.

East JE Example - Figure 1 is a top plan view of the camera body equipped with a 7-ocal plane shutter to which the present invention is applied, and Figure 2 is a top view of the camera body shown in Figure 1. FIG. 2 is a block diagram showing the circuit configuration of FIG. In Figure 1, the camera body (1
) are the main switch (2) and release button (3).
) f up key (4).

Down key (5), AE lock switch (6), LCD display 1! l5 (7) and an accessory shoe (8) are provided. Here, near the up key (4) is a symbol X indicating the flash synchronization limit speed (for example, 1/250 second).
However, a symbol B indicating bulb exposure is printed near the down key (5). Further, the AE lock switch (6) performs exposure control based on the photometric value when the switch is operated prior to the shirt release operation (so-called,
When shooting with AE lock, the switch is made from the non-AE lock position where AE lock is not possible to the AE lock position where AE lock is possible, but in addition to the letters "AFL" indicating AE lock possible, there are also letters indicating partial metering in the AE lock position. “5POT” is
In the non-AE lock position, there is a character “” indicating that AEtff cannot be locked.
In addition to "OFF", the letters "AVE" indicating average photometry are printed on each.

In FIG. 2, the camera body (1) mainly includes a microcomputer (11), a film information reading section (12)
, photometry IB (13), g output control n (14), and JC/display control section (15). Here, the film information reading section (12) reads film information formed in the form of an electrical code signal (hereinafter referred to as DX code) on the outer peripheral side of the film cartridge, and reads the film information formed in the form of an electrical code signal (hereinafter referred to as DX code), and This is a circuit section that outputs to.

The photometry section (13) includes a light-receiving element (16) for average photometry and a light-receiving element (17) for spot photometry. ). Note that these light receiving elements (16) and (17) are located outside the photographic optical path where they can receive light from the subject that has passed through the semi-transparent part of the photographic lens or reflective mirror and been reflected on the shutter curtain surface or film surface. It is located at the position of The exposure control section (14) controls the shutter speed and aperture according to the output of the microcomputer (11). The display control unit (15) is a microcomputer (11)
The internal display 1 (18) and the external display section (7) are driven and controlled according to the output. Furthermore, when the main switch (2) is in the "LOCK" position, the 12th
As shown in the figure, control is performed to turn off all the display elements of the two display sections.

Further, a photographing lens (19) and an electronic flash (20) are detachably attached to the camera body (1).

Here, the photographing lens (19) stores lens-specific data regarding its optical and mechanical characteristics, aperture value, etc. on the camera body (19).
1) is output to the microcomputer (11), and the microcomputer (11) receives this lens information and the film information.

Exposure control information is calculated based on photometric information and the like.

Similarly, the electronic flash device (20) outputs seven flash information such as a mounting signal and a charging completion signal to the microcomputer (11). The microcomputer (11) inputs M(IP,) to (IP*
), output end (OP o), interrupt end (INT), clear j
1 (CLR), and when the signal falls to the interrupt end (INT), an interrupt operation, which will be described later, is started, and when the signal goes to the clear end (CLR), a reset operation, which will be described later, starts. Switch (S o) = (S u) - (S d), (S a) are the aforementioned main switch (2) and 7-key (4), respectively.
, down key (5), and AE lock switch (6). In addition, the main switch (
2), the switch (So) closes in the “ON” position, and pressing the up key (4) and down key (5) closes the switch (S
u) = (S d) is closed, A E Oy switch (6
) The switch (S a) is closed at the "AFL" position. The switches (S+) and (S2) are linked to the press operation of the release button (3) mentioned above, and the photometering switch (S,) is opened at the beginning of the suppression operation, and the photometering switch (Sl) remains closed at the final stage. Release switch (S2) closes.

The switch (So) is connected to the input terminal (IP) of the microcomputer (11).
, ), and the one-shot circuit (2
1L is connected to the interrupt terminal (INT) via AND date (AN, ) and off date (OR+);
pJ/L/AkfSxJ111xi-h611j-1-
) switches (S,), (Sa) and the output of the off-date (OR,) described later are connected, and the other input terminal of the or-date) (OR,) is connected to the inversion of the output terminal (OPo) of the microcomputer (11). An output and a switch (S o) are connected.

The switches (S+), (Su)-(Sd), and (St) are connected to the input terminals (IF't)-(I) of the microcomputer (11), respectively.
The switch (S2) is connected directly to the input end (IP, ) of the microcomputer (11) via (OR2) when the switch (S2) is off. *
In addition, switches (S, ), (Sa) and off-date (O
The output of Rz) is input to ANDD) (AN,), and its output is connected to the input end (IP2) of the microcomputer (11).

This input terminal (tPz) is connected to the switch (S +) = (S 2) - ( when the switch (SS> described later) is closed.
(hereinafter referred to as photometry hold) for a predetermined period of time after any one of Sa) is closed.

The camera of this embodiment has a program mode in which the combination of shutter speed and aperture is uniquely determined based on a predetermined program diagram.

There are two types of program modes: a program mode for natural light photography (hereinafter referred to as P mode) and a program mode for flash photography (hereinafter referred to as FP mode). *In addition, in each mode, the combination according to the predetermined program diagram can be manually shifted while maintaining the appropriate exposure (hereinafter referred to as P shift or FP shift). In addition to exposure control, it also has a manual mode that allows you to manually set the shutter speed and aperture.

The switch (S,) is a switch that opens when the exposure control operation of the exposure control section (14) is completed and closes when the film winding operation is completed. This switch (S,) is directly connected to the input terminal (IF7) of the microcomputer (11), and is also connected to the other input terminal of the OR (OR,). Therefore, if the film winding is not completed, the release button (3)
) is pressed and the release switch (S2) is closed, the output of OR2 (OR2) remains "High", so the microcomputer (11) does not shift to exposure control operation. When the input terminal (IPt) determines that the switch (S3) is open, the exposure control operation is stopped.

The switch (Sx) is a point mxm for synchronized flash emission, and is connected to contact (b) from the time when the shutter front curtain completes travel until the shutter rear curtain completes travel; )It is connected to the.

While this switch (Sx) is connected to contact (a), the integral operation that integrates the reflected light from the film surface in photometry 1ffi (13) is prohibited, and when it is switched to contact (b), the integral operation is prohibited. At the same time, the electronic flash device (20) starts emitting light.

Photometry 1 (13) includes a photometry circuit provided for each of the average photometry photodetector (16) and the partial photometry photodetector (17), and the outputs of these two photometry circuits, that is, the average photometry value (
(hereinafter referred to as AVE) and spot photometry value (hereinafter referred to as AVE) and spot photometry value (hereinafter referred to as AVE)
An A/D converter that performs A/D conversion by selectively inputting a command from a microcomputer (11) to the A/D converter (referred to as 5POT);
It is equipped with a data output section that sequentially sends A/D converted data to the microcomputer, and this output data allows the microcomputer (
11) performs exposure calculation, and the photometry section (13)
Furthermore, there is a part that reads the film sensitivity data sent from the microcomputer (11), a D/A converter that converts the film sensitivity data into an analog signal, and a part that outputs the average photometry photometry circuit from the D/A converter. When the switch (Sx) is connected to the contact (b), the output of the adder circuit is integrated, and when the integral value reaches a predetermined value, an electron is sent to the terminal (e). It includes a light emission amount control section including a circuit that outputs a signal for stopping the light emission of the flash device (20).

In addition, this light emission amount control section
When the I nll region is determined (described later) and when P shift is performed in FP mode, film sensitivity data is
The amount of light emitted by the flash is increased by IEv and sent to the photometry circuit to reduce the amount of flash light from the appropriate exposure level by IEv. During flash photography other than those mentioned above, the film sensitivity data is output so that the amount of flash light emission is adjusted to the appropriate exposure level.

The electronic flash (20) is connected from the output terminal (g) to the microcomputer (1
A charging completion signal indicating completion/incomplete of charging is output to the input terminal (IPa) of 1), and an electronic flash ( 20
) outputs a mounting signal indicating that the power switch is closed.

FIG. 3 shows the operation of the microcomputer (11) shown in FIG.
- Chart 70 - The operation of the entire camera will be explained based on this chart.

First, when the power supply (22) is loaded into the camera body, the clear terminal (CLR) is activated by the power-up clear circuit (23).
) becomes the “LOW” level momentarily. As a result, the microcomputer (11) starts running the RESET routine, initializes the input/output board and RAM (#1), and then proceeds to the 5TOP routine.

This routine also jumps to the end of the metering hold, which will be described later, so first, stop the metering operation (#2) and set the output capo (OP, ) to "High". Enable interrupts (#3). And A.E.
The lock 7 lug AF is reset and the mounting 7 lug NF is set (#4). Here, the flag AF is set when the AE is locked, and the 7 lug NF is set when the electronic flash (20) is not mounted. Furthermore, by this step #4, A
Even if the E-lock switch (6) is set to the 'AFL' position, the photometry section (13) always performs the photometry operation the first time.

Next, the manual flag MF is determined (#5
), here, the flag MF is set when the main switch (So) is closed and one of the switches (SuL (Sd) is closed. By this setting, the exposure control of the camera is set to program mode from now on. If flag MF has been reset, display units (7) and (15) will display standby as shown in Fig. 13 (#6), and if flag MF has been set, the first
Only the shutter speed is displayed as shown in FIG. 4 or FIG. 15. The specific display format will be described later, but
By changing the display format according to the state of flag MF, it is possible to know whether the camera is in auto mode or manual mode even when it is not in the photometry mode. After these displays, the microcontroller stops operating ($
8).

Next, when the main switch (So) of the camera is closed, the interrupt terminal (INT) of the microcomputer (11) becomes -LOW instantly by the one-shot circuit (21) shown in Fig. 2, and the interrupt is activated. This causes the microcomputer (11) to
Start running the NT routine.

In the INT routine, the next interrupt is disabled by setting the output terminal (OP, ) to 'LOW'(#9), and this I
To prevent other interrupts from occurring during the execution of the NT routine, the input jl (IP, ) causes the switch (S +)
-(Sz)*(Sa) are all open (#10), here, switch (S+)-
If (S2) and (Sa) are all open, proceed to step #11, reset flag MF, and switch (S
u)”=Determine whether (Sd) is closed (
Well 12. #13), if the switch (S u) is closed, set the shutter speed to 1/250 seconds ($14) and set the 7-lag MF #16), switch (S d)
is closed, set the shutter speed to pulp ($1
Set the 7 lag MF from 5) (#16). When the flag MF is set, the shutter speed will be fixed at the set value (1/250 seconds or pulp) and the aperture will be set to the 7 tap key (4). , the manual mode is set according to the operation of the down key (5). On the other hand, the switch (
Su).

(Sd) are both open, the flag MF advances to step #17 until the reset intention, step #17
Now, clear the registers PR and FR and reset the 7-lag FF. Register PR here.

The FR stores the program shift amount in the natural light photography program mode and the flash photography program mode, that is, the P shift amount and FP shift amount, and the 7-lag FF allows you to remove the auto mode and set the aperture manually during flash photography. possible mode (hereinafter referred to as FL manual mode)
It is set when That is, the main switch (So
) m* causes all P shift) tFP shift) tFt and manual to be canceled. And the aforementioned 5T
The program advances to the OP routine and the microcomputer stops.

If any of the switches (Sl), (S2)-(Sa) is engaged while the microcontroller is running the 5TOP routine or is stopped, an interrupt is sent to the microcontroller, and the microcontroller
To start the NT routine, these switches (S,
), (S z) * (Sa) are collectively referred to as a start switch.

When executing the INT routine with any of these startup switches, the input terminal (IPI) is LOW''(#
10) Proceed to the Note, S, and LooP routines, and first determine whether the main switch (So) is closed using the input terminal (IP, ) (#18).

Here, if the main switch (So) is open, the process proceeds to step #17 described above, executes the P shift) IFP shift), PL manual t-cancel L, and 5TOP routines, and then stops. On the other hand, if the main switch (So) is closed, photometry is started (#19), photometry is performed every 250m5, and the photometry values are stored in the internal memory. Furthermore, read the film information from the DX code of the film cartridge, and if there is no DX code, set the ISO value to 10.
0 ($20), and electronic flash (2o
) to read the information about the installed and fully charged 7 Latsushie ($2
1) Read lens information such as the maximum aperture value (Avo) and minimum aperture value Av-ax from the photographic lens (19) (stir 22), and determine the key switch ('Su) * (Sa) (# 23), perform exposure calculations based on the above information and find the shutter speed and aperture value for photography ($
24), display this ($25).

Next, use the input terminal (IPI) to determine whether the start switch is closed or not ($F26), and if any of the start switches is closed, reset the timer and restart the timing operation (#27). Proceed to step #28, and if all are open, proceed immediately to step #28.This timer is
This is a timer for photometry hold judgment, and when 10 seconds have elapsed since all start switches were opened, the photometry section (13)
If the release switch (S) is closed, exposure control is performed using the shutter speed and aperture value determined in step #24 (#). The time counting state of the timer is determined from step 29) #30), and if the switch (S2) is listening, the process immediately jumps to step #30.

Here, if 10 seconds have not elapsed, the above S and L
If the OOP routine is repeated and 10 seconds have elapsed (
That is, when the photometry hold ends), the process proceeds to the 5TOP routine and stops. Note that at the end of this metering hold, unlike when the main switch f (S, ) is opened, step #1
7 is not executed, P shift) #FP shift and FL manual are not canceled.

The above is the general operation of this embodiment. The detailed operation of this embodiment will be described below.

FIG. 4 shows in detail step #22 of lens information reading and step #23 of KEY determination in 70- of FIG. 3. First, open the aperture value A from the lens.
Read the lens information of v6 and minimum aperture value Av and aX (#31), and then determine the presence or absence of lens information (#32). Here, if the lens is not attached to the camera or if the lens information is If the lens information is not read, such as when a lens that is not available is attached to the camera, the process advances to step #33 and the AvotAv-
Set both ax to "0", clear registers P R and F R, and perform the actual aperture calculation described later.
P shift is canceled when the lens is removed from the camera body (when the lens information is lost).

On the other hand, if there is lens information, the process proceeds to the KEY determination routine and first determines the flag MF ($$34). If the 7-lag MF has been reset, then the input terminal (IPI
) to determine whether the electronic flash device (20) is attached ($ 3
53. Here, if the electronic flash device (20) is not attached, it is determined whether the up key (4) or the down key (5) is pressed or not #36. #38) The P shift amount in the P mode is set by adding or subtracting 1 to the register PR ($37439) each time these keys are pressed. If the electronic flash device (20) is installed, proceed to step #40 and enter the input jl (IPs
) to determine the charging completion state. If charging is not completed, immediately proceed to step #24 in Figure 3 and KE
If you do not make a Y judgment, that is, if charging is not completed even if the electronic flash device (20) is attached, press the up key (4).
), the down key (5) does not function. On the other hand, if charging is complete, check whether the AE lock is activated using the flag AF ($41), and if the AE lock is activated, the up key (5) will not function. , the down key is determined (#42, #44), and the FP shift amount in the FP mode is set by adding or subtracting 1 to the register FR ($43.#45) each time these keys are pressed.

If the AE lock is not locked, step #
Proceed to #46, move the shooting aperture value to the setting register Ays, and judge the 7 key and down key #47
．． #49), each time these keys are pressed, register Ay
Add or subtract 0.5 EV to s for $48. l$5
0), set a 7-lag FF ($51), where the aperture can be changed in all channels from Av6 to Avmax, and when it is less than Avo or more than Avmax, the contents of Avs are changed to Avo or Avmax, respectively. A vm
*Fixed to x. In addition, if there is no lens information, AV8
The contents of will automatically become 0. Through the above processing, the aperture value in the FL manual mode and in the case where there is no lens information for manual mode is determined.

The calculation routine of step #24 in FIG. 3 will be explained in detail based on FIG. First, determine whether the electronic flash (20) is installed using the input terminal (IP*) (#53). If the electronic flash (20) is not installed, clear the register FR and reset the 7-lag FF. FP Schiff)
, release the FL manual (#56), set the 7-lug NF and remember that the electronic flash (20) is not installed (#57), while the electronic flash (20) is installed. If so, clear the register PR and reset the P shift amount in P mode (#54), and determine the 7 lag NF (#55).If it is not a new installation, the AE lock is done by the flag AF. If the AE lock is not activated, the photometry section (13) determines whether the AE *5PO is present or not.
Read the light values on both sides of T, put the AVE value into the R1 register, 5
Input POT value to R2 register ($$60), AE
If it is locked, do not input the photometric value.Also, be sure to read the double-sided light value AVE *5 POT because the period in the S, LOOP routine (
That is, this is because the cycle in which the microcomputer reads information from the photometry section is short.

For example, when the switch (Sa) is closed and the spot photometry value 5POT must be locked, by constantly inputting the light values on both sides in this way, the photometry value can be read immediately without waiting until the next photometry cycle. You can select and lock it, and perform calculations, display, and exposure control based on that value.

On the other hand, if the 7-lag NF is set in step #55, that is, if the electronic flash (20) has just been installed, the 7-lag NF is reset and the electronic flash (20)
Remember that the electronic flash unit (#58) is attached, and immediately proceed to step #60 without making a flag AF determination and input the photometric value.This is because the electronic flash unit (2
0), the shooting conditions will completely change from before, so the photometry value in P mode will not be carried over to FP mode, and the photometry will be re-measured by -1.

Next, the AE lock switch (S a) closes and the I/1
If so, set 7-lag AF (#62), and if so, clear register FR and reset flag AF ($
63), and further, the photometric value AVE depending on whether an electronic flash device is attached or not and whether an AE lock is installed.

Selectively adopt one of the 5 POTs (#64~$
67), that is, when an electronic flash is installed, the average photometric value AVE is taken regardless of whether or not AE lock is installed, and when an electronic flash is not installed, the spot photometric value is 5POT with AE lock, and the average photometric value AVE is obtained with non-AE lock. Adopt. After that, clear the metered manual register for displaying the positive or negative difference between the set exposure value and the appropriate exposure value in manual mode, and reset the 7-lag FI for F1ll-I n7 Lassie for FP Momo ( $68>.

Next, the exposure value Ev is calculated by adding the photometric value information By obtained in the above-mentioned step #66 or #67 to the film sensitivity information Sv obtained in step #20 of FIG. 3 (#69),
And manual flag MF and electronic flash (20
) determines the calculation mode depending on whether charging is completed or not (1
$70.1 $71).

That is, when the flag MF is set, the mode becomes manual mode with a constant Tv value and AV set value regardless of whether charging is completed or not.
When the flag MF is reset, the mode becomes P mode when charging is not completed, and the mode becomes FP mode when charging is completed.

In the case of P mode, in FIG. 6A, the presence or absence of lens information is first determined ($72). If there is no lens information, the actual aperture AE calculation is performed to determine the shutter speed based on the actual aperture of the lens. ($73); in this case, the fringe value will be displayed as "-1"; on the other hand, if there is lens information, the P mode will calculate the shutter speed and aperture value based on a predetermined program diagram. Perform the program AE calculation ($74). If the contents of the register PR are not "0", perform the program shift calculation to shift the shutter speed and aperture value from the above calculated values according to that value ( $76).

In the case of the FP mode, in #16, FIG. In other words, if there is lens information and AE lock is set, the FP mode program AE calculation (details will be described later) that is compatible with AE lock is performed to calculate the shutter speed and aperture value, and the cost is N$.
79), If the contents of the register FR are not "0'", shift the shutter speed and aperture value from the above calculated values according to that value (#81), and if there is lens information, the AE
If the 7-lag FF is not locked but reset,
Perform program AE calculation for FP mode (#83
), if a 7-lag FF is set, it will be in manual mode, just like when there is no lens information, the shutter speed will be fixed at 1/250 seconds (L84), and the aperture value will be set using the up key (4). *The difference between the exposure value of this combination and the appropriate exposure value, which is the value set by the TAKE DOWN key (5) (#85), is calculated as a metered manual value (#87).

FIG. 7A shows in detail the FP mode program AE calculation in step #83 of FIG. This FP calculation sets the shutter speed to 1/1 of the flash sync speed limit.
The aperture value is fixed at 250 seconds (Tv=8) and the aperture value is IEv under from the appropriate exposure value determined only by natural light.

First, the shutter speed is set to 1/250 second (#88), and the zero order is fixed. Then, the E obtained in step #69 of Figure #15 is
Add IEv to the v value to obtain Ev', and at the same time set the 7-lag FI for fill-in flash. This is to adjust the amount of light emitted from the electronic flash to control it from the appropriate level1.
Next, subtract Sv from Ev ($90), By is APE
If the X value is 8 or more, the value obtained by adding 1 to SV is set as Ay (#93), and if Bv is less than 8, the value obtained by subtracting Tv from Ev' is set as Ay (#92). ,A
v is determined within the range from lr'Av value of Avo and F2.8 to Avmax (for example, F2.8 to F22). Then, (T v + A v) is Ev'
(Jilt, appropriate exposure value Ev to IE
(v or more under), 7 blowfish F! reset 0
Through the above processing, the shutter speed and aperture value in the FP mode are determined. FIG. 9 shows a program diagram for this FP mode. In addition, in FIG. 9, the horizontal axis shows the Ev value, and the vertical axis shows the Av value and Tv value, respectively! Indicates the ΔEv value (deviation amount from the appropriate exposure level).

゛Figure 7B shows the program AE calculation for FP mode suitable for AE lock in step #79 of Figure 5. In this FP mode for AE lock, the shutter speed changes according to the subject brightness, and So-called slow synchronization, which is slower than 250 seconds, is also possible. Therefore, exposure to natural light can be maintained from appropriate to IEV under or higher even at low luminance, so that F 1ll-I n is obtained at all luminances.

Also, the upper limit of the aperture value set by ISO is removed. In this AE lock FP calculation, the 7-lag FI is first set, and the value obtained by adding 1 to Ev obtained in step #69 of FIG. 5 is set as Ev'(#97), and then the shutter speed is set to 1. /250 seconds binding (#98), Ev' to T
Subtract v and set the value limited within the range of A Vo -A vmax to Av (# 99 >, at this time, Av -
When is limited by Avo, the limited Av is subtracted from Ev' to obtain Tv. The solid line in FIG. 10 shows a program diagram in this AE lock FP mode. still,
Similar to FIG. 9, the horizontal axis shows the Ev value, and the vertical axis shows the Av value, Tv value, and ΔEv value, respectively.

FIG. 7C shows the FP shift F calculation in step #81 in FIG. 5 in detail. Here, FP shift means Tv, Av obtained by the above AE lock FP calculation.
This means changing the combination based on the set shift amount while keeping the value (Tv+Av) constant.
Show how the program diagram changes with shifts using dashed lines other than solid lines and one point! Indicated by #I etc., *Z, register R3 that counts the number of shift stages is set to 0 (I 103), next 1,
The register R3 and FR are compared L (#104), and it is determined whether or not the set number of shift stages has been carried out according to the contents of the shift amount register register FR. Here, if R3 and FR match, the process proceeds to step #12o and the FP shift ends.

On the other hand, if the shift amount has not been carried out by the set number of shift stages, it is determined whether the register FR is positive or negative ($105), and if it is positive, the process proceeds to the overshift routine, and if it is negative, the process proceeds to the undershift routine.

The overshift routine is a routine that shifts Tv in the up direction and Av in the down direction. First, if the shutter speed is higher than 1/250 seconds, shifting to a higher speed will cause the electronic flash to emit synchronized light. Since this is not possible, the process advances to step #120 and the shift ends. on the other hand,
If the shutter speed is low, 1/250 seconds or less, add 1 to shift register R3 (#107) and add 0.5 to Tv ($108). At this time, the shutter speed is 1/250 seconds. If the speed is higher, increase the shutter speed by 1.
Fix it to /250 seconds 110), subtract Tv from Ev to calculate Ay #111), and set Av to Avo-A
The shift is limited within the range of vma, and the process proceeds to step #120 to end the shift. Also, the shifted shutter speed is 1/
If the speed is lower than 250 seconds, then determine whether the fringe value is Aye (i.e., open aperture value) ($113),
If it is open, 1 is subtracted from R3 (#114). This is because Av is already open due to overshifting and cannot be shifted further to the open side, so the shift counter is subtracted by 1. Thereafter, 0.5Ev is subtracted from sAv (#115), and if the shifted Av is greater than or equal to Awe, the process returns to step #104 and the shift is continued again. On the other hand, if the shifted Ay is less than Av6, then A
Fix v to Avo 1l17), subtract Av from Ev to calculate Tv #118), Tv from 30 seconds to 1/25
The shift is limited within the range of 0 seconds and the process proceeds to step #120, where the shift ends. Incidentally, the broken line in FIG. 10 indicates a state in which overshift has been performed twice.

The undershift routine moves s Tv in the down direction, Av
This routine shifts Tv in the up direction.
If the speed is lower than 30 seconds, it is impossible to shift to a lower speed than this, so the process proceeds to step #120 and the shift ends. On the other hand, if Tv is higher than 30 seconds, subtract 1 from R3 ($122) and subtract 0.5Ev from Tv (#12).
3) At this time, if Tv becomes slower than 30 seconds (#1
24), fix Tv to 30 seconds #125), calculate Av by subtracting Tv from Ev #1ll), set Av to Av
Limit within the range of o-Avmax, step #120
Proceed to , and the shift ends. On the other hand, if Tv is faster than 30 seconds, then it is determined whether Av is Avmax (i.e., the minimum aperture value) (#126), and if it is the minimum aperture, 1 is added to R3. (#127). This is because Av is already at the minimum aperture due to undershift (undershift) and the aperture cannot be reduced any further, so the shift counter is incremented by 1. After that, add 0.5EV to Av #128),
If the shifted Av is less than Avmax, the process returns to step #104 and the shifting is continued again. on the other hand,
If the shifted Av is greater than or equal to Avmax, change Ay to A
Fixed to vmax $130), subtract Av from Ev to calculate Tv #118), Tv for 30 seconds ~ #12
It advances to 0 and the shift ends. Incidentally, in FIG. 10, the dashed line indicates a state undershifted twice.

In step #120, the contents of R3 are stored in FR, but the reason for doing this in step 2 is to replace FRt- with the limited shift amount when the subject brightness changes during shift and the shift amount is limited. It is. As a result, when shifting in the opposite direction, T Vt A v changes immediately, improving responsiveness when operating the up key or the grand key.

FIG. 11 is a diagram showing the fully lit state of the external display section (7) and the internal display section (15) of this embodiment, and FIG. 12 is a diagram showing the fully turned off state when the main switch (So) is turned off. FIG. Figures 13 to 15 are both on standby! ! ! Figure 14 shows the display of the up switch (when the main switch is closed and not in photometry mode).
If you close the main switch (So) while closing the down switch (Sd), Fig. 15 shows that while closing the down switch (Sd), the main switch 18, is displayed, indicating that it is in manual mode.

Figure #116 shows the display in each mode during photometry. Even if the AE lock switch (S a) is engaged,
When an electronic flash is attached, the 5POT display does not appear and the average photometry value is A.
Indicates that exposure control is performed by VE, and when the up switch or down switch is closed when the electronic flash is fully charged (i.e. FL manual mode), or when 17250 seconds is set in manual mode. The metered manual display is performed using the symbol . These data displays in FIG. 16 are performed by displaying the calculated data in chronological order in the display control unit (15).
The metered/manual symbol Tv=Av is displayed, and the photometry/calculation/exposure control mode and charge completion signal are sent to the display control section (15) to display the mode and charge completion. This operation is performed in step #25 in FIG. 3, but the specific flow will be omitted since it can be easily deduced by those skilled in the art.

In this embodiment, when the electronic flash device is fully charged and the AE lock switch is open, when the up switch or down switch is finally pressed, Tv is fixed at 1/250 seconds.
FL manual mode is used as the setting value for Av, but as another example, Tv is fixed at 1/250 seconds and Av is set at 1/250 seconds.
v can also be a value shifted by a shift amount determined by an up switch or a down switch from a value obtained by FP calculation from By and Sv. The program diagram for this FL manual shift is shown in FIG. 17. At this time, A
y changes depending on the brightness, and has a difference corresponding to the number of shift stages set with respect to Av found by the FP calculation at all brightnesses.

In addition, when the aperture value reaches the limit when switching from the F1ll-I ill range to the normal range, the shutter speed is changed from 17250 seconds to the low speed side according to the brightness.
When the brightness is lower than the brightness of 1760 seconds, fix it at F2.8 and 1/60 seconds,
The illumination range may be expanded.1゜In the above embodiment, the program mode was used as an example of the camera's automatic exposure control mode, but the present invention can also be applied to exposure time priority mode and aperture value priority mode. Applicable. In this case, the manual setting member is a push button or a shutter dial for setting the exposure time in the exposure time priority mode, and a push button or an aperture operation ring for setting the aperture value in the aperture value priority mode.

In order to detect that a manual operation member is being operated, in the case of a push button, the same key discrimination method as in the above embodiment may be used (in the case of a dial or operation ring, the photographer's hand may be detected). A detection means for mechanically or electrically detecting the touch may be provided on the dial or the operation ring.

Further, in the above embodiment, the exposure time in manual mode is fixed to 1/250 seconds or the bulb, but it may be possible to change this arbitrarily, that is, by pressing the up key (4) or the down key (5). ) is pressed, the main switch (2) is closed and the exposure time is reduced to 1/250.
The second is fixed to the second.

When the lock switch (6) is in the "OFF" position, operating the 7 key or down key will change the aperture value, and with the AE lock switch (6) in the "AFL" position, operating the 7 key or down key will change the exposure. The exposure time and aperture value can be changed arbitrarily using the AE lock switch and the up and down keys. It goes without saying that during FL manual mode, the exposure time must not be faster than 1/250 second.

1゜As described above, according to the present invention, in a camera having an automatic exposure control mode, the main switch is activated when operating the manual operation member for changing the combination of exposure time and aperture value in the automatic exposure control mode. Since the manual mode is set only when the manual mode is operated, there is no need to provide a special operating member for setting data in the manual mode.Also, since the manual mode is used relatively infrequently, this Sharing the operating members in this manner helps to simplify the configuration of the camera and reduce costs.

Further, according to the embodiment of the present invention, two types of manually operated members are required: a member that increases one of the exposure opening and aperture value and decreases the other, and a member that decreases one and increases the other. , 1/250 seconds and pulp are set respectively, so that it is easy to set 1/250 seconds, which is frequently used in manual mode, or to open when pulp is exposed. Furthermore, according to another embodiment, the aperture value can be manually set according to the operation of the manual operation member after switching to manual mode, so an aperture setting section is not required, and the configuration of the camera is further simplified. .

[Brief Description of the Drawings] Fig. 1 is a plan view showing the external appearance of a camera to which the present invention is applied, Fig. 2 is a block diagram showing the circuit configuration of the camera shown in Fig. 1, and Figs. 3 to 7 are Figure 2 is a 70-chart showing the operation of the microcomputer, Figures 8 to 10 are program diagrams showing exposure control data in each flash photography mode, and Figures 11 to 16 are displays in each operating state of the camera. FIG. 17 is a program diagram showing exposure control data in another flash photography mode. 2: Main switch, 3.4: Manual operation member, $23.
#24: Data setting means Applicant: Minolta Camera Co., Ltd. Fig. 1 I23 Fig. 5 1/ Fig. External display section (7) Viewfinder display section (15) ±
Power, firepower ζ. How to ask the main sui sichi (Sa)
time) Stan Paibo 3 Jun (k 小淋昭まWE, non-photometering) Nutanno CGυj3. [Mani 17 + Shishi 1 door (TV = Vt
5oly) Notes when crossing] Standby a missing 1 [Manual 7-rd (TV/Pal]) Saddle running 3) Fig. 76 Destruction 1 Koshin display Fig. 77

Claims (1)

[Claims] 1. In a camera having an automatic exposure control mode that performs exposure control based on photometric values, from a prohibition device that prohibits photometry/exposure control operations of the camera to a permission position that permits photometry/exposure control operations. a main switch to be switched; a manual operating member; a determining means for determining when each of the main switch and the manual operating member is operated; data change that operates when it is determined that the exposure time and aperture value determined by the automatic exposure control mode are changed in accordance with the operation of the manual operation member while maintaining the relationship of the combination that provides the appropriate exposure. a means for switching the exposure control mode from the automatic exposure control mode to the manual mode based on the manual setting value; 1. An exposure control data setting device for a camera, comprising data setting means for switching to an exposure control mode and fixing an exposure time to a predetermined value. 2. The automatic exposure control mode is a program mode in which exposure is controlled using the exposure time and aperture value based on a predetermined program diagram, and the manual operation member increases one of the exposure time and aperture value based on the program diagram, and increases the other. It has a first operating member for decreasing one by the same amount and a second operating member for decreasing one and increasing the other by the same amount, and the data setting means synchronizes the exposure time by the flash when operating the first operating member. 2. The exposure control data setting means for a camera according to claim 1, wherein the exposure time is set to the limit speed and the exposure time is set to the bulb when the second operating member is operated. 3. The data setting means according to claim 1 or 2, wherein the data setting means changes the aperture value in response to re-operation of the manual operation member after switching the exposure control mode to the manual exposure control mode. Camera exposure control data setting means.