JPS61215537A - Flash dimmer - Google Patents

Abstract

PURPOSE:To perform correct dimming operation regardless of the position and the state of a subject by providing a dimming means which divides a photographic area into plural areas and dims light, and dimming the light of an area where the subject is present. CONSTITUTION:When a command signal is outputted from a command signal generating means 2 to a storage means 3, the storage means 3 stores a light metering output corresponding to the brightness of the center part of an image plane among divided areas whose light is metered by a division light metering means 1. A selecting means 4 inputs the light metering output of the image plane center part light metering outputs of the respective divided areas to detect the correlation among them. Then, the position of the subject is detected and an area to be dimmed is specified to the dimming means 5 which dims plural areas.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flash light control device capable of controlling flash light in each area of a photographic screen divided into a plurality of parts.

2. Description of the Related Art Conventionally, it has been known that a flash control device is built into an electronic flash device main body, and another is built into a camera main body. And their dimming range (area)
is approximately the entire photographic screen or a relatively wide range including the center of the screen.

Problems to be Solved by the Invention In a flash light control device, the light control level for stopping flash light emission is determined based on the light reflected at a certain ratio with respect to a certain light emission amount. be done. For example, an object with a certain reflectance (average reflectance) that includes the area to be dimmed is placed facing the flash device, and the flash is emitted so that the reflecting object has the appropriate exposure. The dimming level is determined based on the amount of light reflected from the reflective object.

However, in general flash photography, the amount of light reflected from the subject is not constant, resulting in overexposure or underexposure depending on the setting of the dimming level. To explain in detail, for the light control area within the shooting screen,
If the proportions of objects at the same distance differ, for example if lenses with different focal lengths are used, or if the number of subjects is singular or plural, it will naturally be reflected from the subject. , the amount of light incident on the dimmer is different. Therefore, the amount of flash light that is determined by the amount of light that enters the light control device is also different from the amount of light that enters the light control device, and it is natural that the exposure is not stable because of this.

In order to solve these problems, it is possible to make the light control area small and spot-like, and then direct the light towards the subject you are trying to photograph.If you do this, the light control area will be □The amount of light that always exists within the subject and is reflected is constant, so the exposure is also appropriate. However, even with such means, if the subject is outside the light control area, the amount of flash light will naturally be off and the exposure will not be appropriate. The probability of this happening increases as the dimming area becomes smaller.

From the above, in order to solve the above problems, the ratio of the main subject to the light control area is increased. That is, it is sufficient to make the light control area small to some extent and to make the subject exist in that area. To do this, the shooting screen is divided into multiple parts to correspond to the position of a given subject, and the subject is detected in which of the divided light control areas. All you have to do is specify the dimming area of the position and dim the light. The means for achieving this is shown in FIG. and a command signal for generating a paper command signal to store a photometry output corresponding to the brightness of the central part of the screen within the plurality of areas photometered by the divided photometry means. a generating means, a storage means for inputting this command signal and storing a photometric output corresponding to the brightness of the central part of the screen, and a correlation between the stored photometric output and the photometric output corresponding to the brightness of each area. (7) detecting an area to be dimmed out of the plurality of dimming areas (2) selecting means for selecting the area to be dimmed.

When a command signal is output from the operation command signal generation means (2) to the storage means (3), the storage means (3) outputs the divided photometry means (
Among the divided areas photometered in step 1), the photometry output corresponding to the brightness at the center of the screen is stored. Then, with your selection hand, you can detect the position of the subject and adjust the light in multiple areas (
5) Specify the area to be dimmed.

Embodiment FIG. 1 shows a light receiving element (
This shows the pattern of ``The aroma of spc)'', and the shooting screen is shown as (
It is divided into five areas, SPCL) to (SPC5), and a focus detection area for focus detection is included in the imaging area of (SPCI).

FIG. 2 is a diagram showing an optical system for focus detection and photometry according to an embodiment of the present invention.

First, to explain the optical system for focus detection, the photographing lens (L
The light that has passed through O) passes through the main mirror (MR) whose entire screen is a half-mirror, a portion of which is reflected by the sub-mirror (SMR), and is sent to the solid-state image sensor (CCD) by the lens (B2). re-imaged on top. Next, the optical system for photometry will be explained. The light that has passed through the photographing lens (LO) passes through the main mirror (MR) and forms an image on the shutter screen (SH). The surface of this shutter curtain C3H) is processed to be a diffusing surface and to have almost the same reflectance as that of the film surface (FLM). The image formed on the shutter curtain (SR) is re-imaged on the light receiving element (spc) by the lens (Ll), and the light is measured for each divided area shown in FIG. After the release, the main mirror (MR) and the submirror (SMIL) are retracted from the photographing optical path, and a photographed image is formed on the film surface (F LM ). During flash photography, the image formed on the film surface (FLM) is captured by the light receiving element (SPC).
Since the image is re-imaged upward, it is possible to monitor the reflected light of the photographic light from the subject for each photometry range shown in FIG.

FIG. 3 is a circuit diagram according to an embodiment of the present invention. (
COM) is a microcomputer (hereinafter referred to as microcomputer) that performs sequence control and calculations for the entire camera.
l) is a bias voltage for applying a bias to the photodetector, and (OPI) to (op5) are operational amplifiers connected to the photodetector elements (SPCI) to (spc5), respectively, which measure the photometry area shown in Fig. 1. Circuit, (Tr l ) ~ (Tr5
) are transistors for converting the photometric currents of the light receiving elements (SPCI) to (SPC5) into logarithmically compressed voltages, (Bl) to (B5) are buffers for inheatance conversion, and (VRI) to (VR5) are Adjustment resistor is used to adjust element variations, and (M)Dp) is a buffer (B1).
An addition circuit that adds the photometric outputs from ~(B5), (DV
) is a division circuit that divides the value of the above adder circuit, (AN
SW) is an analog switch that selects multiple photometric outputs input according to the signal from the microcomputer (COM);
DC) is an A/D converter that converts the analog signal from the analog switch (ANSW) into an 8-bit digital signal, (E) is the power supply, and (R1) and (CI) are for resetting the microcontroller (COM). Resistor and capacitor, (Tr5) is a transistor for supplying power to circuits other than the microcomputer (COM), (SWI) is
Pressing the first stage of the release button (not shown) activates the ONL, shooting preparation switch (S) for starting photometry and focus detection.
H2) is the release switch that starts the release when the second step of the release button is pressed, and (SWAEL) is the photometering of the center part of the screen (SP (part 4)) of the divided areas shown in Figure 1. AE lock switch for memorizing the output (M
gl) is the release start magnet, (Mg2),
(Mg3) is a locking magnet for locking the first and second curtains of the shutter, (SH4) is a timing switch that turns OFF when winding is completed and turns ON when the second curtain has completed traveling, (osc) is an oscillator, (AV r C) is the set aperture value (AVSET) and its lens open aperture value (AVO
) +7) Aperture value setting circuit that outputs the step number difference (AVSET AVQ) as a 3-bit digital signal, (SVC
) is a film sensitivity setting circuit that converts the set film sensitivity into an 8-pit digital signal and outputs it to the microcomputer (COM). The circuit that generates the light emission stop signal to be output to the electronic flash device (FL) is the film sensitivity setting circuit (
A D/A converter (DAC) that converts the digital signal from the SVC) into an analog signal, and an adder circuit (ADD) that adds the photometric output and the analog signal indicating the film sensitivity.
1), an integrating circuit (INT) that integrates the output from the adder circuit (ADDI), and a comparator circuit (C) that compares the integrated voltage with a reference voltage. (SWX
) is a synchro switch for flashlight emission, which is normally on the b side, changes to the 3rd side when the first act is completed, and returns to the b side when the second act starts.

The automatic focus detection device includes a solid-state imaging device (CCD) for detecting information about the brightness of the subject, an interface circuit (IF) for converting the output signal of the solid-state imaging device (CCD) into a predetermined signal, and It is equipped with a focus calculation circuit (AFC) that calculates a signal of object information and controls a motor (M) that drives a photographing lens (not shown). The operation of the automatic focus detection device of this embodiment will be explained with reference to the time chart shown in FIG. 6. When the photographing preparation switch (51) is turned on, the focus detection start signal (AFS)
COM) to the focus calculation circuit (AFC), focus detection is started, and the lens is driven by the motor (M'). When the lens is in focus, the motor (M) is stopped [7], the lens drive is stopped, and a focus detection completion signal (AFE) is output from the focus detection calculation circuit (AFC) to the microcomputer (COM). After focusing, focus detection will not be performed even if the framing is changed unless the photographing preparation switch (Sl) is released.

The operation of the circuit configured as described above will be explained with reference to the flowchart shown in Fig. f44 or Fig. 5.

First, when the battery is installed, a signal that changes from a low level (hereinafter referred to as "0") to a high level (hereinafter referred to as "l") is input to the reset terminal of the microcomputer (COM), and the oscillator (
The microcomputer (COM) executes a reset routine (RESET) shown in FIG. 5. Here, each output terminal (signal) and ~ flag are reset (
#l~#7, #10. #ll), interrupt (IN
T2) is disabled ($8) and interrupt 1 is enabled,
In response to the stop command, the oscillator (OSC) stops oscillating, and the microcomputer (COM) itself also stops. The current consumption in this state is almost O.

Next, when any of the shooting preparation switch (SWI), release switch (sw2), and AE rotary switch (SWAEL) is turned on, a signal that changes from "0" to rlJ is sent from the OR circuit (OR) to the microcomputer (COM). The microcomputer (COM) executes the interrupt 1 routine (INTl) shown in FIG. 4.

First, the input terminal (pwc) of the microcomputer is set to "0" and the transistor (Tr5) is turned on to supply power to each part (#14). Next, flag l (FLGI), flag 2 (FLG2), AE lock flag (AELF)
Reset the AEg calculation end flag (AEEF).

(#15 to #18). Next, disable interrupts to interrupt #19), determine whether the shooting preparation switch (SWI) is ON, and if it is ON, set the focus detection start signal (AFS) to rtJ and start focus detection. Let me, O
If not, the focus detection start signal (AFS) is
0". As a result, the focus detection is stopped during the focus detection operation (#20 to #22). Next, proceed to the photometric output import subroutine (BVIN) (see Figure 5), where the photometric output and average value of each light receiving element (SPCI ~ 5pc5) are A/D converted and sent to the microcontroller (COM) as digital values. I'm taking it in. In detail, as shown in Table 1, by specifying the channel (CI (l to CH3)), photometric analog output is output from the analog flow switch (ANSW) to lines (Ll) to (L6).
Set the A/D conversion start signal (AD STR) to "1" and
/D conversion is performed, and when the A/D conversion is completed, the A/D conversion end signal (ADEND) is set to "1". Then, this is repeated sequentially and taken in as a digital signal to the register (BVI) ~ (BV6) + C of the microcomputer (COM) (#5
6~#64).

(Space below) Table 1 Next, the film sensitivity digital signal is sent from the film sensitivity setting circuit (SVC), and the aperture stage number is sent from the aperture value setting circuit (Avrc) to the port (PL) of the microcontroller (COM).
, (P2), input L, register (SV).

(AVr) (#24, #25) o Next, flag 1 (FLGI) and flag (FLG2) are determined (#26, #27). Here, when focus is achieved during automatic focus detection or when the AE lock switch (5W
When AEL ) is turned on, the brightness value at the center of the screen (
It memorizes the SPI photometry output, and the flag l (F
LGl ) = 1,77g2 (FLG2 ) = O(7
), the contents of the register (BVI) are taken into other registers.

Let this captured brightness value be (BVX).

Cocote, 7 Lag 1 (FLGI)l;i brightness value (B
On the other hand, flag 2 (FLG2), which means whether the contents of the register of the brightness value (BVX) is valid or not, is set to "1" after the brightness value (BV
X) is 7 la';f 1 (FLGI) ro J
It will be taken in only the moment it becomes a color RL JLC (#28).

#29).

The routine shown below is for calculating the shutter speed (TV), and is used to calculate the main capacitor (
Whether charging has been completed or not and whether the 4i value (BvX) is valid (F LGI = 1) or not (pt
c1 = 0 Months are divided into the following four types. (Charging completion signal (RDY) is rlJ if charging is completed.
, if the battery is not charged, "0" is output from the flash device (FL) to the microcomputer (COM). )■RDY=Q F
LG1=0 This means that the calculation is performed when the brightness value (BVX) has not yet been captured during natural light photography.

As is known from the past, abnormal highlights and shadows are cut out based on the brightness value (photometric output) of each photometric area, and the remaining average value (BV6) is used as a reference to obtain a high probability of correct exposure. Calculate the brightness value (BVO) (#30~
32). Alternatively, the brightness value may be calculated using the calculation method disclosed in Japanese Patent Laid-Open No. 57-42026.

■ RDY=Q FLG1=1 When shooting with natural light, the brightness value (BV
This means an operation with X) taken in.

In addition to the case of ■ above, there is information on the brightness value (BVX), so use this to create a new brightness value that is closer to the stored brightness value (BVX) than the brightness value (BVO) calculated in ■. Calculated as (BVO). This allows you to obtain an appropriate exposure that takes into account not only the subject but also the surroundings (#
30. #3, #34).

This is explained in the exposure calculation subroutine (BV
To explain with reference to Q calculation 2), similarly to ■, first calculate the brightness value (BVO) excluding the brightness value (BVX) #88), then compare this with the brightness value (BVX) # 8
9), a fixed ratio of the difference is fed back to the brightness value (BVX).

Specifically, the −electric ratio is expressed as (aj l BVX−BVOl <1(7))
...1/2 of the difference (#90) (bl l BVX-BVOl>1(7)...
As 1/8 ($91) of the difference, a brightness value is calculated that takes into account the entire screen, centering on the brightness of the main subject. Another method is to feed back a certain amount corresponding to the difference to the brightness value (BVX) depending on the magnitude of the difference.

As yet another calculation method, the monoelectric ratio of the above difference or a certain amount corresponding to the difference may be fed back to the brightness value (BVO). That is, step $80. -881 BVO-1/8 (BVO-BVX)-BVO(#9
0') BVO-1/2 (HV6-BVX), BVO
(#911) ] 2, the brightness value (BVO) obtained in step #88 is fed back to the main subject, and even if the brightness value closer to the subject brightness is calculated by considering the entire screen, the AE lock is still in effect. It is determined whether the switch (SWAEL) is turned on (#35). This is to determine whether the calculation in step #34 above is based on the AE rotor or on focus detection. To explain in detail, if the object is in focus during focus detection (AEL
F=Q), each time this flow is entered, the brightness value (BVX) of the central part at the time of focusing and the brightness value (BVO) calculated from the entire screen at that time in step #88 are calculated. A new brightness value (BVO) is calculated, and a shutter speed is calculated from this new brightness value (BVO) in step #33. For example, when framing is performed after focusing, a new value is calculated from the brightness value (BVQ) calculated from the entire screen in the framed state in step #88 and the brightness value (BVX) of the central part at the time of focusing. A brightness value is calculated. On the other hand, if it is due to AE lock (AELF
= 1), brightness value in the center at the time of AE lock (B
A new brightness value (BVQ) is calculated from the brightness value (BVO) calculated from the entire screen, and the brightness value (BVO) is calculated from the brightness value (BVO) calculated from the entire screen.
VO), the shutter speed is calculated in step #33. That is, when the AE rotary switch (SWAEL) is turned on, even if framing is performed, the brightness value and shutter speed, which are the exposure calculation values, do not change (7). (AELF), and if it is "0", proceed to step #33, and if it is "1", determine the AE rotary calculation end flag (AEEF), and if this flag is not set, set it. Proceed to step #33 and calculate the shutter speed (#35 to #
37). If the AE lock calculation end flag (AEEF) is set, the process proceeds to step #42 without performing calculation of shutter speed.

The remaining two types indicate low-light photography, and the shutter speed is uniquely determined by a synchronized shutter speed of 1/60. Here, the stored brightness value (BVX) and each brightness value (photometric output) shown in FIG. 1 are compared to determine the area of the light receiving element (SPC) where dimming should be performed.

■RDY=I FLG1=0 The brightness value (BVX, ) of the main subject has not been captured yet. That is, this is a case where the position of the main subject on the photographic screen is not known. Therefore, one of the areas shown in FIG. 1 cannot be specified. Therefore, the entire screen (zone 6) is specified as the light control area, and the light control output averaged over the entire screen at the time of release (analog output of line L6)
is output to the adder circuit (ADDI) (#30, #
38 to #40) ■RDY=I FLGI4 The brightness value (BVX) of the main subject area has been captured, and the process proceeds from step #38 to step #41, the dimming area detection subroutine (ZONE detection) (fifth (see figure). In this dimming area detection subroutine, the position of the main subject within the photographic screen is detected, and the area of the light receiving element (spc) shown in FIG. 1 is determined in order to dim only that area.

First, the brightness value (BVl, . . . , BV5) of each area is subtracted from the stored brightness value (BVX), and the area with the smallest deviation is detected (#65 to #69). This area is designated as the area where the main subject exists by the microcontroller (
COM) specifies this area and switches the analog switch (AN
The dimming output is output from SW) to the adder (ADDI) (#70, $72). However, even if the area has the smallest deviation, if the deviation is too large (1) or if there are several similar values in other areas, there is a possibility that the detection is incorrect. As in the case, the entire screen is set as the light control area, and the average of the light control area at the time of release is set as the light control output. (#70, #71).

Next, the process proceeds to a flag (FLG) setting routine. When the AE lock switch (SWAEL) is turned on, the AE lock flag (AELF) is set and the flag l (FL
GI) (#42, #48, #49)
. When the above switch (SWAEL) is not turned on, reset this flag (AELF) and the AE rotary calculation end flag (AEEF) (#42 to #44)
,. Next, when focus is detected by the automatic focus detection device, the microcomputer (COM) sets the flag (FLGI), and otherwise resets both flag l (FLGI) and flag 2 (FLG2) (#45 ~#
47° #49).

Next, the program proceeds to a so-called power hold routine in which the power is maintained for a certain period of time. This routine includes the photometry switch (SWI),
Even if the AE lock switch (SWAEL) and release switch (SW2) are turned off, photometry and display are maintained for a certain period of time. The timer mentioned here is a hardware timer in the microcontroller.When the timer is preset and a start command is given, it measures time regardless of the flow, and when the timer ends, the timer interrupts (TINT).
It is said that it takes

Here, the terminal (INTI) of the microcomputer (COM) is “0”.
Please start the timer when ” #50, #53),
When the value is "1", the timer is stopped and the timer is preset again (#50 to #52). Then, when the predetermined time has been counted, the timer interrelated (T I NT)
starts from the TIIT routine, stops the timer (#13), and executes the reset routine (RES).
ET), and the camera becomes stopped again.

Next, determine whether the timing switch (sw4) is turned on or not (#54), and when winding is completed,
In other words, when the timing switch (SW4) is OFF, an interactive routine (I) is executed to permit the release.
NT2) is permitted (#55).

Next, the release operation will be explained. When the release switch (sw2) is turned on in the winding completion state, an interrupt is generated and an interwoven routine (INT2) is executed. First, disable interrupts to this routine #
-73), 1st and 2nd act magnet (Mg2), (M
g3) (@74. $75). Next, the channel of the analog switch (ANSW) is specified based on the area specified in the dimming area specification step (#76,
#77). Next, focus detection start signal (AFS) and A/D
After setting the conversion start signal (ADSTR2) to "0", turn on the release start magnet (Mgl) (#78~
#80). When this magnet (Mgl) is turned on, a mirror (not shown) rises, and it takes about 5Q m5 until it stabilizes.
EC is required, so wait for this time ($81), 5Q
After m5ec has elapsed, the first act magnet (Mg2) is set to 0FF by setting the integration start signal (INrS) to "1".
The Ll curtain runs (#82 to #83). When the first act is running, the synchronization switch (SWx) is switched to the a side. At this time, if the switch (not shown) for flashlight emission is ON, flashlight emission will start, and at the same time the AND circuit (AND) will
”, so the integrating circuit CINT) starts integrating. This integration is performed over the area specified in the dimming area detection subroutine as described above. When the integral value reaches a certain value, a light emission stop signal is sent from the comparator circuit (C) to the electronic flash device (
F L ) and light emission stops. Then, when the shutter speed time determined in step #40 for flash firing and step #33 for natural light photography has elapsed, the microcomputer (COM) turns off the second curtain magnet (Mg3).
F, turn on the timing switch (SW4) or stabilize the mirror down, and go through the photometry loop again (#84
~#87).

Next, a second embodiment is shown in FIGS. 7.8 and 9. Since this embodiment is almost the same as the first embodiment, only the parts that are different from the first embodiment will be described. The first embodiment was a so-called one-shot autofocus in which focus detection is stopped once the automatic focus detection device detects that the focus is in focus, whereas the second embodiment uses a shooting preparation switch (SW).
While I) is on, focus detection is always continued, and when it is desired to stop the focus detection operation, a newly installed AF lock switch (SWAFL) is turned on, which is what is called continuous autofocus. This operation will be explained with reference to the time chart in FIG. 9. When the shooting preparation switch (SWI) is turned on, the focus detection start signal (AFS) becomes "1", focus detection starts, and lens is driven.

When the AF lock switch (SWAFL) is turned on, the focus start signal (AFS) becomes rLJ and focus detection is stopped. If you turn off the AF lock switch (SWAFL) while the shooting preparation switch (SWl) remains on,
The automatic focus detection device starts focus detection again, and when the photographing preparation switch (SWI) is turned off, the focus detection start signal (AFS) becomes "0" and stops focus detection.

FIG. 7 shows a circuit configuration when such an automatic focus detection device is used. Compared to FIG. 3, an AF lock switch (SWAFL) for stopping focus detection is provided, and instead, the line for the focus detection end signal from the focus calculation circuit (AFC) is deleted.

Next, to explain the flowchart in FIG. 8 showing the flow of this control, compared to FIG. 4, the flag is formed depending on the state of the focus detection end signal in FIG. The 7 lags are simply formed depending on the state of the lock switch (SWAFL), but the other operations are exactly the same. That is, the brightness value (BVx) is captured at the time when the AF lock switch (SWAFL) is turned on.

Although examples based on the present invention have been shown above, the present invention is not limited thereto. For example, the method of dividing the photographing screen may be other than that shown in FIG. 1, and may be one in which the photographing screen is divided into squares. If the focus detection range spans a plurality of areas at that time, the plurality of areas including at least the detection range may be set at the center of the screen. Further, although the light receiving element for self-absence light reception and the light receiving element for dimming are shared, they may be provided separately. In this case, it would be expensive to divide the light receiving elements for dimming by the same number, so we divided the screen into two parts, one in the center and almost the entire screen, and detected that the main subject was in the center. It is only necessary to adjust the brightness in the center of the screen at certain times, and to adjust the brightness across the entire screen at other times.

Effects As explained above, according to the present invention, a light control means is provided that can perform light control by dividing a photographing area into a plurality of areas, and a light control area in which a subject is present in the divided areas is controlled. Since the light is emitted, the light can be adjusted more accurately than conventional light control devices, regardless of the position occupied by the subject within the photographing area and its condition.

[Brief explanation of drawings]

FIG. 1 is a pattern diagram of a light receiving element showing the division pattern of the light receiving element according to the present embodiment, FIG. 2 is a schematic cross-sectional view showing the optical system for focus detection and photometry of a camera, and FIG. 4 and 5 are flowcharts showing the flow of the first embodiment of the present invention, and FIG. 6 is a circuit diagram showing the operation of the automatic focus detection device used in the first embodiment. 7 is a circuit diagram showing the circuit of the second embodiment, FIG. 8 is a flowchart showing the flow of the second embodiment, and FIG. 9 is the automatic focus detection used in the second embodiment. A time chart showing the operation of the device and FIG. 10 are block diagrams showing the configuration of the present invention. (1)...Divided photometry means (2)...Command signal generation means (3)...Storage means (4)...Selection means (5)...Dimmer control means Applicant: Minolta Camera Co., Ltd. Figure 1 Figure 5 Figure 6 Figure q

Claims (11)

[Claims] (1) A divided photometry means that divides the photographic screen into a plurality of areas and performs photometry, a light control means that divides the photographic screen into a plurality of areas and can perform flash dimming in each of these areas, and the above-mentioned divided photometry means a command signal generation means for generating a command signal to store a photometry output corresponding to the brightness of the center of the screen among the plurality of areas to be photometered; a storage means for storing photometric output corresponding to the
A selection means detects a correlation between the stored photometric output and a photometric output corresponding to the brightness of each area, and detects and selects an area to be dimmed from among the plurality of dimming areas. , a flash dimmer that dims the selected area. (2) The flash light control device according to claim 1, wherein the plurality of photometry areas and the plurality of light control areas are divided in the same division format. (3) The flash light control device according to claim 2, wherein the plurality of light receiving elements used in the divided photometry means are also used as the plurality of light receiving elements used in the light control means. (4) The flash light control device according to claim 1, wherein the plurality of photometric areas and the plurality of light control areas are divided into different division formats. (5) The flash light control device according to claim 4, wherein the number of divisions of the region of the light control means is smaller than the number of divisions of the region of the divided photometry means. (6) The selection means takes the difference between the stored photometric output and the photometric output corresponding to the brightness of each area, detects the area where this difference is the minimum, and selects the dimming area from this detected area. A flash light control device according to claim 1. (7) When the difference between the photometric output corresponding to the brightness of the detected area and the stored photometric output is greater than a predetermined value, or when multiple areas with the minimum difference are detected on the screen 7. The flash light control device according to claim 6, wherein the entire flash light control device is adapted to control light. (8) The exposure calculation device according to claim 1, wherein the command signal generating means generates a command signal when a separately provided photometric output storage operation switch is operated. (9) The exposure calculation device according to claim 1, wherein the command signal generating means generates the command signal when a focusing signal from an automatic focus detection device is input. (10) The exposure calculation device according to claim 9, wherein the automatic focus detection device stops focus detection and outputs a focus signal once it detects that the focus is in focus. (11) The above-mentioned automatic focus detection device continuously detects the focus without stopping even when the focus is focused, and is equipped with a focus detection stop switch for stopping the focus detection, and when the switch is operated, the focus is detected. The exposure calculation device according to claim 9, which outputs a focus signal.