JPH0766136B2 - Exposure compensation device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposure correction device when there is a so-called backlit state in which there is a luminance difference between a main subject such as a person and a sub-subject such as the background thereof.

Conventional technology Conventionally, the partial brightness of the object scene (the brightness of the main subject such as a person)
And the average brightness (brightness of the sub-subject such as background),
Japanese Patent Application Laid-Open No. 48-94429 discloses a device that automatically switches to flash photography as a backlit state when there is a difference of a certain value or more regardless of the brightness of the field.

Problems to be Solved by the Invention Above, the device disclosed in JP-A-48-94429,
When the difference between the brightness of the main subject and the brightness of the background is a certain value or more, the flash light is emitted in order to reduce the brightness in the backlit state. However, even when the charging voltage of the main condenser for strobe light emission has not reached a predetermined level, that is, even when charging is not completed, the device is switched to strobe photography as if the device is in the backlit state, and photography using a strobe is performed. Is being carried out. However, since the main capacitor is not fully charged, the strobe does not emit light or the amount of light emission becomes insufficient, so that the purpose of the above device cannot be achieved. Also, if a so-called release lock function is added to the above device, which makes it impossible to shoot until the charging voltage of the main capacitor for strobe emission reaches a predetermined level, the purpose of this device can be achieved, It takes time for the capacitor charging voltage to reach a predetermined level, and misses a photo opportunity.

Means for Solving the Problems In order to solve the above problems, the exposure compensating device of the present invention has a backlight detection means for detecting a backlight condition, a strobe means including a main capacitor, and charging of the main capacitor completed. The charging completion detection means for detecting whether or not, the distance output means for outputting the distance from the camera to the subject, the exposure control means for controlling the exposure of the camera, when it is detected that the backlight condition, When the main capacitor is charged and the distance from the camera to the subject is not infinity, flash firing is possible, and when the main capacitor is not charged or the distance from the camera to the subject is infinity. In this case, the light emission of the strobe is prohibited and the exposure light is corrected.

When the operation backlight detection means detects backlight, when the charging completion detection means detects that charging of the main condenser of the strobe means is completed and the distance output means outputs from the camera to the subject is not infinity, The correction means controls the back light by controlling the strobe light of the strobe means to emit light. On the other hand, when the backlight condition is detected and the main capacitor is not fully charged,
Or if the distance from the camera to the subject is infinity,
The correction means inhibits flash light emission and corrects the backlight by correcting the exposure.

In order to detect the backlight condition, the photometry means for partial photometry and the photometry means for average photometry are used as described above. First, where is the photometry area of the light receiving element for partial photometry on the photographing screen? Whether the main subject can be captured efficiently, that is, whether the backlit state can be detected more reliably will be described below with respect to the photometric region when the number of the light receiving elements is changed.

FIG. 2 shows the case where there is one light receiving element for partial photometry.
(1) is a shooting screen, (2) is a region where the light receiving element for average photometry is measuring light, (3) is a region where distance measurement is performed,
(4) is a region where the light receiving element for partial light metering is measuring light. When there is one light receiving element for partial photometry, the light measuring area of this light receiving element is set to the center in the left-right direction of the screen and to the lower center in the up-down direction. Here, the reason why the photometric area of the light receiving element is centered in the left-right direction is that the person is most likely to be centered in the left-right direction. Especially for a camera displaying an area for distance measurement in the finder, it is common to set the distance measurement area in the central portion of the finder, so that it is more likely that a person will be present in the center. At this time, if the camera has a mechanism (hereinafter AF lock) that can store the result of distance measurement, if AF measurement is performed at the same time as memory (hereinafter AE lock) of the result of photometry, the distance measurement will be correct even if freeze shooting is performed. Also, photometry can be performed. On the other hand, the photometric area of the light receiving element for partial photometry is below the center in the vertical direction in order to more reliably capture the person who is the main subject. More specifically, when the light measuring area of the light receiving element is used to measure the face portion of the person, the person's face on the photographing screen becomes smaller when the distance becomes longer, and becomes smaller than the light measuring area. In other words, the light metering area is also metered in areas other than the face of a person. Generally, the light receiving element is attracted to the bright part. For this reason, when the rest of the photometric area is brighter than that of the person's face in the photometric area, the photometric output of the light-receiving element remains Depends on the brightness of
The metering output corresponding to the brightness of the person's face cannot be obtained. Further, if the person is slightly displaced from the center, since the face portion is small, it is likely to be displaced from the distance measurement area, and it becomes difficult to accurately expose the person's face. On the other hand, when the photometry is performed on the body part of the person, the probability that the main subject is displaced from the photometry area is lower than that when the photometry is performed on the face part. For this reason, photometry is performed with the width of the person's body (shoulder width). Generally, when the main subject is a person, the body part of the person to be metered is below the center of the screen. Therefore, the photometric area of the light receiving element is set below the center of the screen. However, if it is set too low, when the image is taken on the screen in the vertical position, the photometry area is hardened to the left and right (in the vertical position), and the photometry of the person cannot be performed.

FIG. 3 shows the maximum distance over which photometry is to be performed, for example, the maximum finite distance that can be measured by the distance measuring device, and the measurable range of a person in the photometric area (4) of the light receiving element for partial photometry. In this figure, the photometric area (4) of the light receiving element for partial photometry is completely covered by the human body,
It enables accurate photometry of the human body part. In the photometry performed in this way, the movable distance of the person to the left and right is set from the center of one face to the center of the other face, and this is designated as (d).

FIG. 4 shows a photometric area when the number of light receiving elements is two.
At this time, it suffices for the person to completely include the photometric area of at least one of the light receiving elements. The photometric area is arranged vertically symmetrically in the lower center of the screen as in FIG. 2 and vertically symmetrically centered on the center. By doing so, the photometric area has a spread to the left and right, and the probability of capturing a person more accurately is higher than when there is one light receiving element. It is important to note here that when measuring the body part of a person, within the maximum distance, the fifth
The goal is to prevent things like the one shown in the figure.

In the example shown in FIG. 5, at least one of the photometric regions is not completely included in the body part of the person, even though the photometric elements are within the maximum distance for attempting photometry because the distance between the light receiving elements is too wide. . In such a state, as described with reference to FIG. 2, when the brightness of the area other than the body of the person is brighter than that of the area where the body of the person is metered,
The exposure of a person's body cannot be performed accurately. To solve this, as shown in FIG. 6, at the maximum distance at which photometry is to be performed, two photometry areas should be included in the entire body size of the person. With reference to FIG. 7, let us think about how much the photometric region is in the paired part of the person by increasing the numerical value. Now, the maximum distance to measure light is 4.5 m, the light receiving angles of the two light receiving elements for partial light measurement are 2.5 °, and the width of the person's body (shoulder) is 45 cm on average.
(FIG. 7- (1)). At this time, the angle at which the width of the body of the person is measured is tan ^-1 ((45cm / 4.5m) ÷ 5.7 ° (Fig. 7- (2)). Fig. 7- (3) shows the proportion of the partial photometry area.At this time, Fig. 7- (4) shows the range in which the person can move to the left and right. The distance becomes (2d ') 51 cm.

FIG. 8 shows the photometric range when the photometric area (4) of one light receiving element is set to the same distance as in FIG. 3 and the photometric area is set as shown in FIG. The distance that a person can move to the left and right is doubled (2d) as compared with FIG.

FIG. 9 shows an example of how to set the photometric area when the number of light receiving elements is three. Even when the number of light receiving elements is three, the relationship as shown in FIG. 6 must be maintained for the two adjacent photometry areas.

FIG. 10 shows the photometric range in the photometric region (4) of one light-receiving element at the same distance as in FIG. At this time, the moving distance of the person to the left and right is 3d.

FIG. 11 shows-(1) and (2) showing another way of taking the photometric area when the number of light receiving elements is three. This considers the screen in the vertical position. Compared to FIG. 9, the measurable range of a person has a spread in the left-right direction (vertical position).

FIGS. 12- (1) and (2) show two examples of how to set the photometric area when the number of light receiving elements is four.

FIG. 13 shows an example of how to set the photometric area when the number of light receiving elements is five. 12 and 13 have a vertical and horizontal spread in a photograph in which the photometric range of a person is vertical and horizontal, respectively, as compared with FIG.

FIG. 14 shows an overall configuration of a control circuit of a lens shutter camera having a shutter that also serves as an aperture according to an embodiment of the present invention. Block (A) is a power supply holding circuit that holds the power supply. The block (B) is composed of a photometric circuit for measuring the brightness of the subject and an automatic focus detection circuit (hereinafter referred to as AF circuit) for measuring the distance from the camera body to the subject. Block (C) is a control circuit that controls exposure control, lens control and strobe light emission control, block (D) is a boost control circuit that controls boosting of the power supply by the strobe circuit, and block (E) is a main capacitor, flash tube, and boost. It is a flash circuit including a circuit and the like.

(S0) is a power switch that interlocks with the lens cover (not shown) and opens (ON) when the lens cover is opened. (S1) opens when the release button (not shown) is pressed down to the first stroke. Power switch to turn on, (S2) to open the release button when the release button is pressed down to the second stroke, and (S3) to close when the shutter etc. is charged and open when the exposure is completed. It is a completion switch. (E) is a power supply, and (Q1) is a power supply transistor for supplying power to the block (B) and the block (C).

FIG. 15 shows a specific circuit example of the power supply holding circuit of the block (A). When the release button is pressed down to the first stroke and the switch (S1) is turned on, the first operation signal (e) goes to high level (hereinafter "H"), and this signal is 13 circuits (NOR1).
When input to, this circuit (NOR1)
Outputs a LOW level (hereinafter “L”). As a result, the power supply transistor (Q1) is turned on, and power is supplied to the block (B) and the block (C). Then, when the release button is pressed down to the second stroke, the release operation signal (f) becomes "H" and is input to the differentiation circuit (OS2),
The differential signal is input to the set terminal of the RS flip-flop (RS1). As a result, the RS flip-flop (RS1) is set, this output Q becomes "H" and is first output to the NOR circuit (NOR1), and the output of this circuit (NOR1) is held at "L". That is, the power source is retained. or,
Output Q of RS flip-flop (RS1) is timer (TM1)
Is also output. This timer (TM1) is set when a signal of "H" is input, and outputs "H" after a lapse of a predetermined time. When the input signal becomes "L" during or after the lapse of a predetermined time, the timer (TM1) holds "L" when this output is "L" and "L" when it is "H". To The predetermined time is the time required for the power supply response of the photometry circuit and the AF circuit. And after a lapse of a predetermined time,
The timer (TM1) outputs "H", this output signal is converted into a differential signal by the differentiating circuit (OS4), and the RS flip-flop (RS2) is set by this signal. As a result, the output Q becomes "H" and is output as a release signal (O). With this signal, the shutter starts to open, and when the shutter is closed after an appropriate exposure time required for shooting, the exposure completion signal (g) becomes "L" and it is inverted to "H" by the inverter (IN1), It is converted to a differential signal by the differential circuit (OS3). This differential signal is output to the reset terminal of the RS flip-flop (RS1) and resets the RS flip-flop (RS1). Output Q by this reset
Becomes "L". The "L" of the output Q is inverted by the inverter (IN2), becomes "H", and is input to the differentiating circuit (OS3). The differentiation circuit (OS3) converts this signal into a differentiation signal and outputs this differentiation signal to the reset terminal of the RS flip-flop (RS2).
2) is reset and the output Q of this circuit (RS2) is "L".
become. Further, the "L" signal of the output Q of the RS flip-flop (RS1) is output to the NOR circuit (NOR1). After that, the NOR circuit (NOR1) waits until the signal (e) becomes "L" (switch (S1) is OFF), outputs "H", and stops holding the power supply.

FIG. 16 shows a concrete circuit example of the photometric circuit of the block (B).
An example of the AF circuit is shown. (SPC1) is a silicon photocell for average photometry, (SPC2) is a silicon photocell for partial photometry, and (OA1) and (OA2) are operational amplifiers. (D1), (D2)
Is a diode for converting the photocurrents flowing in the silicon photocells (SPC1) and (SPC2) into a logarithmically compressed voltage. (COMP3) receives the voltage (VD1) on the anode side of the diode (D1) as a non-inverting input, and
This is a comparator that uses the voltage (VD2) on the anode side of 2) as the inverting input and compares the respective voltages. (COMP4) is
This is a comparator that compares the respective voltages with the anode side voltage (VD1) of the diode (D1) as the inverting input and the reference voltage source (V2) as the non-inverting input. (V1) is a voltage source that is connected between the anode of the silicon photocell (SPC2) and ground and that raises the logarithmic compression voltage by the diode (D2) by a constant voltage. (LED1) is an infrared light emitting diode (hereinafter referred to as infrared LE) that emits infrared light for triangulation.
(D), (SPC11), (SPC12) are the above infrared LEDs (LED
It is a silicon photocell that receives the infrared light that comes out of 1) and is reflected back by the subject. AF circuit is the above infrared
Consists of a light emitting circuit (1) that emits light from an LED (LED1), an AF control circuit (2) that receives the photocurrents of the silicon photocells (SPC11) and (SPC12), calculates this, and converts it into a signal indicating distance. The distance signal (hereinafter referred to as AF signal) is a signal A1 indicating four zones of near, middle, far, and infinity,
A2, A3 and A4 are output to the control circuit of the block (C).
Table 1 shows an example of zones (distance measuring range) of each signal.

When the switch (S1) is turned on, power is supplied to the photometry circuit and the AF circuit, and the circuit starts operating. The silicon photocell for average photometry (SPC1) generates a photocurrent according to the brightness of the average photometry area, and the voltage (VD
1) appears on the anode side of the diode (D1). On the other hand, the voltage on the anode side of the diode (D2) is increased by a voltage (VD3) proportional to the logarithmic value of the photocurrent generated according to the brightness of the partial photometry area by the silicon photocell for partial photometry (SPC2). Voltage (VD2) = sum of voltage (V1) =
(VD3 + V1) appears. Here, the voltage (V1) is a voltage set to detect whether or not the ratio of the brightness of the average photometry area and the brightness of the partial photometry area is equal to or greater than a predetermined value. For example, suppose that it is desired to determine whether or not the brightness of the average photometric area is four times the brightness of the partial photometric area (two steps of Bv value) or more. When the brightness ratio doubles,
The photocurrent ratio of (SPC1) and (SPC2) is doubled, and the difference between the voltages (VD1) and (VD2) becomes about 18 mV (at 25 ° C). Therefore, in order to detect whether the above brightness ratio is 4 times or more, the voltage (V1) is set to 18 mV x 2 = 36 mV, and the voltage (VD3) is increased by this voltage to raise the noise. Voltage (VD2) = (VD3 + V1) and output voltage (VD
Compare 1). Voltages (VD1) and (VD2) are used as a non-inverting input and an inverting input, respectively.
MP3) is input and compared. The result of this comparison is (VD
When 1)> (VD2), that is, when the brightness of the average photometry area is brighter than the brightness of the partial photometry area by a predetermined ratio or more, the comparator (COMP3) outputs "H". In the present embodiment, when this is detected, it is determined that the backlight condition exists. The voltage (VD1), which is the ratio inverting input of the comparator (COMP3), is also the inverting input of the comparator (COMP4). On the other hand, the reference voltage (V2) is input to the ratio inverting input of this comparator (COMP4), and this comparator (COMP4) determines whether the voltage (VD1) is below a certain voltage, When it is below, the comparator (COMP4) outputs "H". In this embodiment, this time is judged to be low brightness. And circuits (G13), (G14) and inverters (IN3), (IN
The logic circuit consisting of 4) allows the comparator (COMP
3), signals (a) and (b) according to the output of (COMP4)
(C) is output. (A) is "H" when the backlight is not low and the brightness is low, "H" when the signal (b) is not backlight and is not low brightness, and "H" when the signal (c) is the low brightness. It is output to the control circuit of (C). In addition,
The voltage (VD1) is output as it is to the control circuit of the block (C) as a signal (d) representing the brightness of average photometry.

Table 2 shows the output states of the signals (a), (b) and (c).

FIG. 17 shows a concrete circuit example of the control circuit of the block (C). (100) is a level shift circuit that shifts the voltage signal (d) indicating the average luminance, (AS1) and (AS2) are analog switches that conduct when a "H" signal is sent, (101)
Is an A / D conversion circuit that receives the "H" signal from the AND circuit (G21) and converts the analog voltage signal that has passed through the analog switch (AS1) or (AS2) into a digital signal, (10
2) is a shutter position detection circuit that outputs a signal indicating the shutter position while the shutter is running, (105) is a signal from the A / D conversion circuit (101), and shutter position detection circuit (1
02) and the ISO sensitivity information signal from the ISO sensitivity information circuit (106), which will be described later, are input, and when these signals have a predetermined relationship, a signal to close the shutter is output to the shutter magnet (AEMg). A shutter closing signal generation circuit (hereinafter referred to as an AE circuit), (106) an ISO sensitivity information circuit (hereinafter referred to as an SV circuit) that converts ISO sensitivity information into an electric signal, and (TM3) from an AND circuit (G21) Of the lens release device (11).
1), and a timer that outputs a signal to the shutter release device (112) to start the shutter release after a predetermined time has elapsed from the start of the lens release. (TM4) receives the shutter release start signal. Timer to output a signal to forcibly close the shutter when the time limit for camera shake has elapsed, and (107) is a lens position detection circuit that outputs a signal indicating the lens position while the lens is running. , (108) is an AF signal indicating the distance from the AF circuit, an ISO sensitivity information signal from the SV circuit (106), a light amount determination signal from a light emission amount control circuit (110) described later, and a shutter position detection circuit (102). The flashmatic that outputs the signal when the shutter position signal of is input and the aperture value reaches the proper exposure for flash photography after the shutter starts traveling. The circuit (hereinafter referred to as FM circuit), (109) receives the lens position signal from the lens position detection circuit (107) and the AF signal from the AF circuit as input,
It is a lens stop circuit that outputs a signal for separating the lens magnet (LeMg) to stop the lens when the lens reaches the lens position according to the subject distance after the lens starts traveling. (110) is the AF signal from the AF circuit and SV
When the ISO sensitivity information signal from the circuit (106) is received and the flash guide number is switched to a small value, the maximum distance that can be the proper exposure at the open aperture value of the lens is
This is a light emission amount control circuit that determines whether or not the distance is equal to or greater than the distance indicated by the AF signal.

FIG. 18 shows a specific circuit diagram of the boost control circuit in the block (D) of FIG. Signal input to this circuit (k)
Explaining (m), the signal (k) is an uncharged signal that becomes “H” when the charging voltage of the first main capacitor (CM1) (see FIG. 19) does not reach the predetermined voltage. Yes,
The signal (m) is a main switch signal which becomes "H" when the switch (S0) is turned on. When the switch (S0) is turned on, the main switch signal (m) becomes "H", and this signal is input to the AND circuit (G31). At this time, if the charging voltage of the first main capacitor (GM1) has not reached the predetermined voltage, the uncharged signal (k) is "H". If the switch (S1) is not turned on, the first operation signal (e) is "L", and this signal is inverted by the inverter (IN22) and becomes "H". It is input to (G31). As a result, the output of the AND circuit (G31) becomes "H", and this signal is converted into a differential signal by the differentiating circuit (OS11). This differential signal is output to the set terminal (S) of the RS flip-flop (RS11),
The RS flip-flop (RS11) is set. By this setting, the output Q of the RS flip-flop (RS11) which is the boost control signal (l) becomes "L", and the boost control transistor (Q11) of the strobe circuit in FIG. 20 is turned on to start boosting. When the switch (S1) is turned on and the first operation signal (e) becomes “H” during this boosting, this signal is output to the differentiating circuit (OS12) through the OR circuit (OR21).
The differentiating circuit (DS12) converts this signal into a differential signal and outputs this differential signal to the reset terminal (R) of the RS flip-flop (RS11). The RS flip-flop (RS11) is reset by this signal, and the output Q which is the boost control signal (l) becomes "H" by this reset. This signal turns off the boost control transistor (Q11) and stops boosting.
After that, when the switch (S1) is turned off, the first operation signal (e) becomes "L", and the output of the inverter (IN22) which inverts this signal becomes "H" and is sent to the AND circuit (G31). Since the switch (S0) is now turned on and the first main capacitor (CM1) is not charged, the AND circuit (G31) outputs "H", and through the differentiating circuit as above, RS flip-flop (RS11) is set,
The boost control signal (l) becomes "L", and boosting is restarted. When the boosting is continued and the charging voltage of the first main capacitor (CM1) reaches a predetermined voltage, that is, when the charging of the first main capacitor is completed, the uncharged signal (k) becomes “L” and the inverter ( It is inverted to "H" at IN21) and output to the OR circuit (OR21). After this, perform the same operation as when the switch (S1) was turned on, and select the OR circuit (OR
The output "H" of 21) is converted into a differential signal by the differential circuit (OS12), and the RS flip-flop (RS11) is reset by this signal, and the output of this flip-flop (RS11) which is the boost control signal (l). Q becomes "H" and boosting stops. On the other hand, when the uncharged signal (k) becomes "L", the AND circuit (G31) is closed. In the present embodiment, the hysteresis of the neon tube (Ne) is used to make the first predetermined voltage that stops the boosting and the second predetermined voltage that is lower than the first predetermined voltage and that guarantees the emitted light amount. And are used as the charging completion voltage, and the uncharged signal (k) is “(1)” until the charging voltage of the first main capacitor (CM1) reaches the first predetermined voltage and then drops to the second predetermined voltage. The AND circuit (G31) is held at "L". That is, the boosting stop is maintained regardless of any signal until the charging voltage of the first main capacitor (CM1) reaches the voltage of the first level and then drops to the voltage of the second level. Signal (J) is the first main capacitor (CM1)
Is a signal indicating that charging is completed, which is a signal obtained by inverting the uncharged signal by the inverter (IN21).

FIG. 19 shows a concrete circuit example of the strobe circuit of the block (E) shown in FIG. (Q11) is a boost control transistor that controls boosting, (Q12) is a feedback transistor that feeds back current, and (Q13) is a DC-DC converter (DC-D
Oscillation transistor that causes C) to oscillate, (DC-DC)
Is a step-up transformer that converts low voltage to high voltage, (D11)
Is a rectifying diode for rectification, (Ne) is a neon tube for detecting a charging voltage that conducts when the main capacitor (CM1) reaches a predetermined voltage, (Q14) is the neon tube (Ne)
The boost stop transistors (CM1) and (CM2), which are turned on when the switch is turned on to stop boosting, are the first and second main capacitors that store the charge required for strobe light emission. The amount of charge stored in the second main capacitor (CM2) is smaller than the amount of charge stored in the first main capacitor (CM1). In (FT), the bird receives the high voltage from the circuit, and the first and second main capacitors (CM1), (C
The flash tube that discharges the charge of M2) and emits strobe light, (SR1) is a thyristor that switches the amount of strobe light emission, and when this thyristor (SR1) is turned on, the first and second main capacitors (CM1), (CM
When the charge of 2) is discharged, it provides a large amount of strobe light, and when it is not turned on, the second main capacitor (CM
2) Discharges the charging charge and provides a small amount of strobe light. In other words, the guide number of the flash can be switched between large and small by turning the thyristor (SR1) on and off. The block (F) surrounded by the dotted line is a trigger circuit that generates a high voltage for causing the flash tube (FT) to emit strobe light when the thyristor (SR2) is turned on in response to the trigger signal (h). is there. Here, a specific circuit configuration of the light emission amount control circuit (110) and the FM circuit (108) will be described. Before that, the guide number of the strobe is large and small 2
The maximum distance (referred to as the maximum interlocking distance) at which the proper exposure is achieved at the maximum aperture value of the lens when switched to
How it changes depending on the ISO sensitivity, and which one of the distance measurement zones indicated by the AF signal sent from the AF circuit, corresponds to, will be explained. The maximum aperture value is F (NO) = 2.8,
The large and small strobe light guide numbers (GN) are respectively (GN)
= 12, (GN) = 6. The maximum interlocking distance is (guide number (G
N)) = (Aperture (FNO) x (Distance (D)) It is obtained from the well-known relational expression.
= 6, the maximum aperture is about 2.1m because the open aperture is (FNO) = 2.8. When using a film with ISO sensitivity of 200, set the maximum interlocking distance above. When using a film of about 3 m, similarly ISO sensitivity 400,
The maximum interlocking distance is about 4.2 m, and when using a film with an ISO speed of 1000, the maximum interlocking distance is about 6.1 m. Compare this maximum interlocking distance with the AF range indicated by the AF signal and consider up to which AF range you can take a proper photo. When using film with ISO sensitivity 100, the maximum interlocking distance is about 2.1 m, so
It is possible to shoot with flash with proper exposure up to the middle range of the range indicated by the AF signal. Although the exposure is appropriate for a subject at a distance of 2.1 m, the medium range is 1.4 m to 2 m, so when shooting a subject at a distance of 1.4 m, the IEV is over. However, considering the latitude of negative-type film, there is an allowable range of about 5 to 6 EV from the proper exposure to the over side, so it may be possible to exceed about 1 EV from the proper exposure. On the other hand, considering the latitude of the film from the proper exposure to the under side, there is only an allowable range of about 2 EV, so we do not want to expose from the proper exposure to the under side as much as possible by strobe light (even in natural light). . Based on the above thoughts, flash photography is possible up to the middle distance range when using film with ISO sensitivity 200 (aperture (FNO) = 4.
3), long range (up to 4.2 for film with ISO speed 400)
m) is possible (aperture is (FNO) = 2.8), ISO sensitivity
Thousands of films can be used for long distances (aperture) (FN
O) = 4.3).

The relational expression of (GN) = (FNO) × (D) is found in Table 3. The guide number of the strobe, the shooting distance, and the aperture value corresponding to them are shown. On the other hand, Table 4 shows the guide number of the strobe used in this embodiment, the shooting distance, and the aperture value corresponding to them.

FIG. 20 shows a specific circuit example of the light emission amount control circuit (110). In FIG. 20, the ISO signal is sent from the SV circuit (106) to the decoder (130) in 2 bits and decoded to obtain the signal (I
It is output as 1) to (I4). This decoded ISO
Signals (I1) to (I4) are ISO sensitivity 100, 200, 400, 1000 respectively
It corresponds to. Therefore, when a film with ISO sensitivity 100 is used, it is possible to perform appropriate exposure up to a medium distance range, so the signal (I1) indicating ISO sensitivity 100 is a signal indicating a short distance range (A
The output of an OR circuit (OR31), which receives (1) and a signal (A2) indicating the middle-range range, is input to the other input of an AND circuit (G41) which has one input. This allows the AND circuit (G41) when the AF signal is a signal showing the range up to the middle distance when using film with ISO sensitivity 100.
Output becomes "H", and this signal becomes the OR circuit ((OR33)
This circuit (OR33) outputs "H" as a signal indicating a small amount of strobe light. Similarly, ISO sensitivity 2
When 00 film is used, the signal (I2) indicating ISO sensitivity 200 and the output of the OR circuit (OR31) indicating the range up to the middle distance are input to the AND circuit (G42), and this circuit (G42)
The output of 42) is output to the OR circuit (OR33). When using a film with ISO sensitivity of 400, it is possible to perform appropriate exposure up to a long range, so the signal (I3) indicating ISO sensitivity of 400 is
An AND circuit (G43) that receives the output of the OR circuit (OR31) that indicates the range up to the middle distance and the output of the OR circuit (OR32) that receives the signal (A3) that indicates the range of the long distance as one input
Is input to the other input of. The output of this circuit (G43) is output to the OR circuit (OR33). Similarly ISO sensitivity 1
When 000 film is used, the output of the OR circuit (OR32) indicating the range to a long distance and the signal indicating the ISO sensitivity 1000 are input to the AND circuit (G44), and this circuit (G44)
Is output to the OR circuit (OR33). With the above configuration, when the strobe guide number is small, that is, when the strobe emission light amount is small, the OR circuit (OR33) outputs the "H" signal. In cases other than the above, for example, when using a film with ISO sensitivity 100, a signal (A
3) is sent, the signal of "L" is output from the OR circuit (OR33) as a signal for switching the strobe guide number to a large value. The signal from the OR circuit (OR33) is inverted by the inverter (IN14) to become the signal (i), which is input to the gate of the thyristor (SR1).

Next, FIG. 21 shows a specific circuit example of the FM circuit (108). The FM circuit (108) receives the information of the guide number (GN) and the distance (D) as input, determines the aperture value (FNO) according to the relational expression (GN) = (FNO) × (D), and further The ISO sensitivity information is input, and the aperture value (FNO) is changed so that the proper exposure is obtained according to the sensitivity information. In this embodiment, since the guide number of the strobe is switched between large and small, it is necessary to determine an appropriate aperture according to each guide number. In order to configure this with a simple circuit, the aperture value is determined by the above relational expression for one of the different guide numbers, and a signal indicating this is received for the other guide number, which corresponds to the difference from the one guide number. The aperture value determined above is shifted by the aperture value to determine the aperture value. This will be described with reference to FIG. In FIG. 21, the FM decoder (12
0) uses the ISO sensitivity information signal from the SV circuit (106) in FIG. 17 and the AF signals (A1) to (A4) as input, and determines the aperture that provides the proper exposure for the larger guide number. The signal corresponding to is added to the adder circuit (121) and the selector (122).
Output to. An adder circuit (121) raises the signal from the FM decoder (120) by a predetermined amount, and outputs a signal indicating a diaphragm for proper exposure to the smaller guide number to a selector (122). The selector (122) selects the aperture value signal sent from the addition circuit (121) and the FM decoder (120) by the guide number switching signal (i) from the light emission amount control circuit (110), and the coincidence detection circuit Output to (123). When the selector (122) receives the signal of "H" as the signal (i), it outputs the signal sent from the adding circuit (121) to the matching circuit (123). On the contrary, when the signal (i) of “L” is received, the selector (12
2) outputs the signal sent from the FM decoder (120) to the matching circuit (123). The matching circuit (123) receives the signal indicating the aperture value sent from the selector (122) and the signal indicating the traveling position of the shutter, that is, the actual aperture value, and when these signals match, Outputs "H" to emit strobe light.

Next, the overall flow of this embodiment will be described. The main purpose of the present embodiment is how to control the camera based on various states at the time of shooting, and the states will be subdivided below, and FIG. 17 will be mainly described accordingly.

(A) Not backlit and not low brightness ... AE shooting (b) Backlit and not low brightness ... Daytime synchronized shooting (c) Low brightness ... Flash shooting (b) Not backlit or low brightness Case: AE shooting When the power switch (S0) is turned on and the release button (not shown) is pressed down to the first stroke, the power switch (S1) turns on.
It turns on and power is supplied to each circuit. With this power supply, the photometric circuit of the block (B) performs photometry, and the output is calculated by the arithmetic circuit. As a result of this calculation, the signal (a),
The states of (b) and (c) are (a) = “L”, (b) =
“H”, (c) = “L”, and output to the control circuit (FIG. 17) of the block (C). Since the signal (b) is "H" in FIG. 17, the NOR circuit (NOR12)
The AND circuit (G25) that outputs “L” and inputs this signal is closed, and the output signal of the circuit (G25), the bird (h), is held at “L”. Therefore, the thyristor (SR2) shown in FIG. 19 is not turned on, and the strobe light is not emitted in this state. The other signal (a) is "L"
Therefore, the AND circuit (G23) outputs "L", and the inverter (IN13) which inverts this outputs "H".
As a result, the analog switch (AS1) is turned on, and the signal (d) indicating the brightness value is sent to the A / D conversion circuit (101) as it is and waits for A / D conversion. The inputs of the AND circuit (G21) that outputs the signal for starting the A / D conversion are the release signal (0), the exposure completion signal (g), and the output of the OR circuit (OR11). Assuming that the shutter is charged, the exposure completion signal (g) outputs "H". The signal (c) is "L" because the brightness of the subject is not low, and this signal is the inverter (IN1
The OR circuit (OR11) outputs "H" because it is inverted in 1) and becomes "H". And the release button (not shown) is 2
When pressed down to the stroke, the release switch (S2)
Is turned on, whereby the release operation signal (f) of FIG. 15 becomes "H", and the release signal (0) becomes "H" through the power supply holding circuit of the block (A). Then, the output of the AND circuit (G21) becomes "H", and the A / D conversion circuit (10
1) and the A / D conversion of the luminance signal (d) is started.
The output of the AND circuit (G21) is also output to the timer (TM3). The timer (TM3) starts timing after receiving the above signal and outputs "H" after a lapse of time required for signal processing required for A / D conversion and opening of the shutter to start release of the lens. As a result, the lens starts feeding. The signal from the lens position detection circuit (107) that detects the amount of extension and the AF signal from the AF circuit are input to the lens stop circuit (109) and extended to the lens position corresponding to the distance indicated by the AF signal. At this time, the two signals match, and a signal for separating the lens magnet (LeMg) from the lens stop circuit (109) is output, so that the lens extension is stopped. Also, from the timer (TM3), the maximum time required from starting the lens release to stopping the lens (for example, to move the lens from infinite distance to short distance or from short distance to infinite distance) After the lapse of the required time), the signal for starting the AE release is output and the shutter (not shown) starts to open. When the shutter starts to open, the signal indicating the shutter position output from the shutter position detection circuit (102) and A / D converted by the A / D conversion circuit (101), and the signal indicating the brightness value and the SV circuit (106). ), The signal corresponding to the ISO sensitivity information is input to the AE circuit (105), and
Based on the SO sensitivity information, when the signal indicating the shutter position and the signal indicating the brightness value have a predetermined relationship,
The "H" signal is input to the OR circuit (OR12), the AE magnet (AEMg) separates, and the shutter closes. Then, when the exposure is completed, the exposure completion signal (g) becomes "L", whereby the AND circuit (G21) is closed and the timer (TM3) is turned off. When the finger is released from the release button and the power supply switch (S1) is turned off, the first operation signal (e) in FIG. 15 becomes "L", and the power supply signal (n) becomes "H". Power supply to the circuit is stopped.

(B) In the case of backlighting and not having low brightness The power switch (S0) is turned on, and when the charging voltage of the first main capacitor (CM1) has not reached a predetermined voltage, boosting is started, and Second main condenser (CM
1) and (CM2) are charged. Then, if the release button is pressed to the first stroke while the first main capacitor (CM1) has not reached the predetermined voltage, boosting is immediately stopped. At the same time, power is supplied to the photometry circuit (B) to start photometry, and the result signals (a), (b), and (c) of this photometry are in the backlit state and have low luminance (a). ) = “H”, (b) = “L”, (c) =
It becomes "L", and these signals are sent to the control circuit (FIG. 17) of the block (C). Now the first main condenser (CM
Since 1) has not reached the predetermined voltage, the charge completion signal (j) becomes "L", is inverted by the inverter (IN12) and becomes "H", and is output to the AND circuit (G23). on the other hand,
Since the other input signal (a) of the AND circuit (G23) is "H", the AND circuit (G23) outputs "H",
Make the analog switch (AS2) conductive. As a result, the analog signal (d) representing the brightness value is shifted to the dark side by a predetermined value (correction of exposure to the over side) by the level shift circuit (100) and output to the A / D conversion circuit (101).
This is because the first main capacitor has not been fully charged, so exposure compensation cannot be performed using strobe light when the subject is backlit, so the aperture and shutter speed can be switched automatically (by level shifting). This is because the exposure is corrected in the backlight condition. Also, when the trigger voltage is sent to the thyristor (SR1) when the charging voltage of the first main capacitor has not reached the predetermined level, but has reached a voltage sufficient to emit light, Thyristor (S
R1) turns on and the flash fires. Then, I am shifting the exposure from the proper exposure to the over side so that the main subject will be properly exposed, but if strobe light is added to this, it will be over-exposed even to the main subject, depending on the amount. turn into. Therefore, in order to prevent this, the inverter (1
Inverted by 6) to "H" and output it to the NOR circuit (NOR12). The NOR circuit (NOR12) that inputs this outputs "L" to the AND circuit (G25) and closes the AND circuit (G25). ,
The flash firing is forbidden. When the release button is pressed down to the second stroke, the circuit operation is performed in the same sequence as in the case (a) described above, and the exposure is performed with the level-shifted luminance value. While the first
When the main capacitor (CM1) of is completely charged,
The charge completion signal (j) representing this becomes "H" and becomes "L" inverted by the inverter (IN12), so the AND circuit (G23) that receives this signal is closed and outputs "L". . This signal is inverted by the inverter (IN13) and becomes "H" to make the analog switch (AS1) conductive.
As a result, the luminance value signal (d) is sent to the A / D conversion circuit as it is. The AF signal output from the AF circuit is input to the light emission amount control circuit (110) and the FM circuit (108). When the signal "H" for selecting the smaller guide number is output by the circuit operation of the light emission amount control circuit (110) described above, the inverter (IN14) inverts this signal and outputs the light emission amount switching signal (i ) As the strobe circuit thyristor (SR
Output to the gate of 1). On the other hand, when the signal "L" for selecting the larger guide number is output from the light emission amount control circuit (110), the inverter (IN14) inverts this signal and outputs the signal "H" to the strobe light shown in FIG. Output to the gate of the circuit thyristor (SR1). When the signal (A4) indicating infinity is sent from the AF signal, the AND circuit (G24) that is inputting this signal changes the "H" level of the other input signal (a). Upon reception, it outputs a signal of "H" to the NOR circuit (NOR12). The NOR circuit (NOR12) receives this signal and outputs "L" to the AND circuit (G25). Therefore, the AND circuit (G25) is closed and the signal (h) becomes "L", so that the flash light emission is forcibly prohibited. On the other hand, when the AF signal indicates a finite distance (A1, A2, A3
Is "H"), and the AND circuit (G24) outputs "L" to the NOR circuit (NOR12). Since the signal (b) which is the other input of the NOR circuit (NOR12) is also "L", the NOR circuit (NOR12) outputs "H" to the AND circuit (G25). As a result, the AND circuit (G25) becomes an OR circuit (OR14).
It is possible to output the trigger signal (h) = “H” for emitting the photographing light after waiting for the output of “H” to become “H”.

When the release button is pressed down to the second stroke and the release switch (S2) is turned on, the same circuit operation as in the above case (a) is performed until the lens extension is stopped. Then, when the release start signal is sent from the timer (TM3), the shutter starts to open. The AE circuit (105) receives the brightness signal from the A / D conversion circuit (101) and the ISO sensitivity information signal from the SV circuit (106) and sends it from the shutter position detection circuit (102) based on the ISO sensitivity. When the received shutter position signal and the brightness signal have a predetermined relationship, "H" is output. The OR circuit (OR12) receives this signal and outputs "H", separates the AE magnet (AEMg), and closes the shutter. The output of this circuit (OR12) is also output to the OR circuit (OR14). The signal from the FM circuit (108) is also input to the OR circuit (OR14). The FM circuit (108) outputs a signal when the shutter has a proper aperture value during shooting using strobe light. But,
If the output of the OR circuit (OR12), which is a shutter close signal, is sent before reaching the appropriate aperture, the OR circuit (OR12)
14) passes this signal and the strobe light is emitted by the diaphragm with the maximum aperture determined by the AE circuit (105). On the contrary, before the shutter close signal is sent to the OR circuit (OR14), the FM circuit (108) outputs the signal for firing the strobe light when the aperture becomes the proper aperture for flash photography. If so, strobe light is emitted at that point. Then, when the aperture value determined by the AE circuit (105) is reached, the shutter is closed. In addition, OR circuit (OR
14) outputs "H" to the AND circuit (G25). As described above, when the AF signal indicates a finite distance, the AND circuit (G25) causes the bird to output “H” as the signal (h) to the strobe circuit (E) and turn on the thyristor (SR2). The bird's circuit (F) is activated and a high voltage is applied to the flash tube (FT). If the signal for selecting the smaller guide number is sent from the light emission amount control circuit (110), the inverter (IN14) outputs "L" to the strobe circuit (E) as the light emission amount switching signal (i). At this time,
The thyristor (SR1) does not turn on. Therefore, only the electric charge stored in the second main capacitor (CM2) is discharged through the flash tube (FT). On the other hand, if a signal for selecting the larger guide number is sent from the light emission amount control circuit (110), "H" is sent to the strobe circuit as a light emission amount switching signal to turn on the thyristor (SR1). Therefore, the first and second main capacitors (CM1), (CM2)
The electric charge stored in is discharged through the flash tube (FT) and thyristor (SR1).

(C) When the luminance is low ... Flash photography The operation of the circuit in the photography in this state is the backlit state of (b), which is almost the same as when the luminance is not low. explain. When the power switch (S0) is turned on and the charging voltage of the first main capacitor (CM1) has not reached the predetermined voltage, boosting is started and the first and second main capacitors (CM1), (CM2)
Is charged. And the first main condenser (CM
When the release button is pressed to the first stroke while the charging voltage in 1) has not reached the predetermined voltage, boosting is immediately stopped. At the same time, power is supplied to the photometric circuit (B) to perform photometry. Since the result signals (a), (b), and (c) of the photometry have low luminance, (a) = “L”, (b) = “L”, (c) = “H”, These signals are sent to the control circuit (17th block) of the block (C).
Figure) sent to. Since the signal (a) is "L", the AND circuit (G23) that receives this signal is closed and outputs "L". This signal is inverted to "H" by the inverter (IN13), the analog switch (AF1) is made conductive, and the brightness value (d) is sent to the A / D conversion circuit (101) as it is. The AND circuit (G24) is also closed because it is inputting the signal (a), and outputs "L" to the NOR circuit (NOR12). The signal (b) which is the other input of the NOR circuit (NOR12) is "L". The NOR circuit (NOR12) outputs "H" to the AND circuit (G25) by these two inputs.
The AND circuit (G25) receives this signal and the OR circuit (OR1
Waiting for the output of "H" in 4), "H" can be output as a trigger signal (h) for emitting strobe light. Now, the charging completion signal (j) becomes "L" because the charging voltage of the first main capacitor (CM1) has not reached the predetermined voltage, and the AND circuit (G22) having this as an input is closed to "L". Is output to the OR circuit (OR11). Further, because of the low brightness, the signal (c) becomes "H", is inverted by the inverter (IN11) and becomes "L", and is output to the OR circuit (OR11). The OR circuit (OR12) outputs "L" to the AND circuit (G21) in order to input these two "L" signals. Therefore, even if the release button is pressed to the second stroke and the release switch (S2) is turned on and the release signal (0) becomes "H", the AND circuit (G21) becomes "H".
Is not output. That is, the release lock is performed. Then, when the release button is released and the voltage is boosted again and the charging voltage of the first main capacitor (CM1) reaches a predetermined voltage, if the release button is pressed to the first stroke, the charging completion signal ( j) is "H", and the output "H" of the AND circuit (G22) which inputs this signal is output to the AND circuit (G21) through the OR circuit (OR11). This releases the release lock. After this, the release button is pressed down to the second stroke, the release switch is turned on, and the release signal (0)
Becomes "H", the output of the AND circuit (G21) becomes "H".
Then, the lens release and A / D conversion are started in response to this signal. After that, the same circuit operation is performed as in the case of the backlight condition of (B), but the exposure time becomes long due to the low luminance, and hand shake may occur. To prevent this, activate the timer (TM4) at the same time as the AE release,
When the time that seems to cause camera shake elapses, "H" is sent to the OR circuit (OR12) and the AE magnet (AEMg) is forced.
Is released and the shutter is closed.

FIG. 22 is a first modification of the photometric circuit of FIG. Transistors (Q21), (Q22), resistors (R11), (R12) are well-known constant current circuits. Transistor (Q23), (Q2
4) is the constant current (I5) of the above constant current circuit and the diode (D
Pour into 11) and (D12). This diode (D1
A stable voltage for two diode stages is supplied to the connection point (J1) between 1) and the transistor (Q24). (SPC20) is a light receiving element for average photometry, the cathode is connected to the connection point (J1), and the photocurrent (I7) is sent to the diode (D13). This diode (D13) receives photocurrent (I7),
A voltage (VD10) that is logarithmically compressed is generated. The base of the transistor (Q25) is connected to the anode of the diode (D13), the logarithmically compressed voltage (VD10) is logarithmically expanded, and a current equal to the photocurrent (I7) flows. The circuit configuration of the transistors (Q26) and (Q27) is for flowing a current equal to the current (I7). Transistor (Q26)
And a transistor that is a current mirror (Q29)
Has its emitter connected to a variable resistor (VR1).
The collector of the transistor (Q32) is connected to the connection point (J2) so that a constant current (I6) flows. (S
PC21) is a light receiving element for partial photometry. The cathode is connected to the connection point (J1) and the photocurrent (I8) is transferred to the diode (D1).
4) This diode (D14) receives the photocurrent (I8) and logarithmically compresses it to generate a voltage (VD11). The base of the transistor (Q28) is connected to the anode of the diode (D14), and the logarithmically compressed voltage (VD11) is logarithmically expanded to flow a current (I8 ') equal to the photocurrent (I8). Then, a current of ((I7 ')-(I8')) flows through the base of the transistor (Q30). The collector of the transistor (Q30) is connected to the base of the transistor (Q31), and the collector of the transistor (Q31) is connected to the AND circuit (G51) and the inverter (IN42). Transistors (Q32), (Q33), resistors (R1
3) and (R14) form a constant current circuit that generates a constant current (I6). (Buf10) is a buffer that receives the logarithmic compression voltage (VD10) of the diode (D13), (R10), (C10)
Is a resistor and capacitor that smoothes pulsating flow (COMP11)
Is a comparator that compares the connection point (J4) with the reference voltage (V10). Next, how to detect whether or not the ratio of the brightness of the average photometry unit and the brightness of the partial photometry unit is equal to or higher than a predetermined ratio, that is, whether or not the backlight state is present is described. Transistor (Q26) that passes a current equal to the photocurrent (I7) of the photodetector (SPC20) for average photometry and transistor (Q29) that is connected to the current mirror have a transistor (Q32) that passes a constant current (I6). ) Collector and variable resistor (VR1) are connected. A voltage is generated by the constant current (I6) and the variable resistor (VR1), so that the voltage between the emitter and base of the transistor (Q29) becomes smaller than the voltage between the emitter and base of the transistor (Q26). Therefore, the current (I7 ') flowing from the collector of the transistor (Q29) becomes smaller than the photocurrent (I7). At this time, the photocurrent (I7) and the current (I7 ') can be made to have a predetermined relationship by controlling the voltage generated. Generally, in order to halve the current due to the characteristics of the transistor, the voltage between the base and emitter is about 18 mV (25
℃) You can lower it. Now, the current (I7 ′) is converted to the photocurrent (I
18m to make 1/4 times (2Ev when converted to brightness) of 7)
Variable voltage (VR1) and constant current (I6) for the voltage of V × 2 = 36 mV
It can be generated by and. It should be noted here that the current (I7 ') is also related to the generated voltage. Specifically, in the generated voltage, both the constant current (I6) and the current (I7 ') flow through the variable resistor (VR1). This means that the generated voltage depends on the brightness. This makes it impossible to accurately control the relationship between the current (I7 ') and the photocurrent (I7). Therefore, in order to reduce the influence of the photocurrent (I7 ′), the constant current is determined so that the constant current (I6) >> current (I7 ′), and the variable resistor (VR1 )
Determine the resistance value of. In this way, a current (I7 ') corresponding to a brightness that is darker by a predetermined amount (2Ev in this embodiment) than the brightness measured by the average photometric light receiving element (SPC20) is generated. On the other hand, a current (I8 ') equal to the current (I8) generated by the partial photometric light receiving element (SPC21) is applied to the transistor (Q28).
Flows into the collector of. A current component of this difference ((I7 '-(I8')) flows through the transistor (Q30). When (I7 ') ≥ (I18'), the brightness of the average photometry unit and the brightness of the partial photometry unit Transistor (Q30) that detects that the brightness is above a certain ratio (2Ev or above) and uses this as input
Is turned on, the transistor (Q31) is turned off, the collector of this transistor (Q31) becomes "H", and it is judged that the backlight is in the backlit state. As described above, it is detected that the ratio of the brightness of the average photometry unit and the brightness of the partial photometry unit is equal to or more than a predetermined value, that is, the backlight state is detected. Comparator (COMP1
1) is the logarithmic compression voltage (VD1
The connection point (J4) showing a voltage equal to 0) is compared with the reference voltage to determine whether or not the luminance is low. Signals (a), (b), (c) and (d) in the figure mean that they are the same signals as in FIG.

FIG. 23 shows a pattern diagram of CdS when CdS is used as the light receiving element. The equivalent circuit of this pattern diagram is
Shown in the figure. In FIG. 23, (T1) to (T3) are terminals of the electrode take-out port, and non-shaded portions (L1) to (L3) connected to these terminals are electrodes and shaded portions (Re
1) to (Re3) are CdS of the photoelectric conversion unit, (Re1) to (Re3)
The external and internal parts indicated by the diagonal lines opposite to are the substrate. (Re1) is CdS of the photoelectric conversion unit for average photometry, (Re
2) and (Re3) are CdS of the photoelectric conversion unit for partial photometry.
The light receiving element using CdS constructed as above has the following features (1) CdS of the photoelectric conversion unit for partial photometry (Re2),
(Re3) and CdS of the photoelectric conversion unit for average photometry (Re1)
And are formed on the same substrate.

(2) CdS of the photoelectric conversion unit for partial photometry (Re2),
(Re3) is connected in series.

(3) CdS of each photoelectric conversion unit for partial photometry (Re
2), the width of CdS between electrodes in (Re3) (d
2) is made thinner than the width (d1) of the CdS between the electrodes in (Re1), which is the CdS of the photoelectric conversion unit for average photometry, and a pattern is formed, so that the width of the CdS for average photometry ( d
CdS per unit area sandwiched between electrodes by enlarging the contact area between electrodes rather than forming a partial photometric part in 1)
Is increasing the number of.

FIG. 25 shows a second modification of the photometric circuit (B) of FIG. 16 using CdS shown in FIG. 23 as the photoelectric conversion element.
(R31) and (R32) are resistors that divide the power supply voltage, and the connection point is connected to the inverting input terminal of the operational amplifier (OA20). CdS-1) is a photoelectric conversion element for average photometry, both ends are connected to the power supply voltage and the collector of the transistor (Q50), and the photoelectric conversion element (CdS-1) is connected to the collector of the transistor (Q50). Points are operational amplifiers (OA20)
It is connected to the non-inverting input terminal of. Operational amplifier (OA2
The output of 0) is connected to the anode of the diode (D40) and the base of the transistor (Q50). The operation of the photometric circuit (P1) configured as above will be described. The operational amplifier (so that the voltage (I10) flowing through the photoelectric conversion element ((CdS-1)) across the resistor (R31) is always equal to the voltage across the photoelectric conversion element (CdS-1). OA20),
The transistor (Q50) works. For example, when the average photometric portion is dark and the resistance value (Rc) of the photoelectric conversion element (CdS-1) is large, the operational amplifier (OA2
0) supplies a small amount of current to the base of the transistor (Q50), and on the contrary, the average photometer is bright and the photoelectric conversion element (CdS-
When the resistance value (Rc) of 1) is small, the operational amplifier (OA20) has a transistor (Q5) so that the current (I10) becomes large.
0) Supply a lot of current to the base. Transistor (Q
51) is connected to the transistor (Q50) and the current mirror so that a current equal to this current (I10) flows. The circuit configuration of the transistors (Q52) and (Q53) is for flowing a current equal to the current (I10) to the other. Resistors (R33), (R34), photoelectric conversion elements (CdS-2), (CdS-3) connected in series, operational amplifier (OA21), transistor (Q56) diode (D41)
The photometering circuit (P2) consisting of performs the same operation as the photometering circuit (P1) described above. The photoelectric conversion element (CdS-2), (CdS
-3) is for partial photometry, and because it is directly connected, it is drawn to the dark photometry area where the resistance value increases, and mainly the dark photometry area is measured. The transistor (Q55) is connected to the transistor (Q56) and the current mirror in order to flow a current equal to the current (I11) corresponding to this brightness. Transistor (Q57), (Q58),
The resistors (R35) and (R36) form a constant current circuit, and the collector of the transistor (Q57) is connected to the connection point between the variable resistor (VR10) and the emitter of the transistor (Q54). The voltage drop due to this variable resistor (VR10) and constant current is the same as the voltage drop due to the variable resistor (VR1) shown in Fig. 22, and the current flowing out from the collector of the transistor (Q53) and the transistor (Q54) connected to the current mirror. Is to reduce the current (I10) by a constant ratio. This constant ratio is decreased in order to detect whether or not the difference between the brightness of the average photometry unit and the brightness of the partial photometry unit is equal to or greater than a predetermined value. In this embodiment, the voltage to be dropped may be a voltage that reduces the brightness of the average photometry by 2 Ev. In this way, the current (I10 ') corresponding to the brightness of average photometry shifted by 2Ev to the under side flows from the collector of the transistor (Q54), and the current (I') corresponding to the brightness of partial photometry is
It flows into the collector of the transistor (Q55), and if this difference ((I10 ')-(I11)) is positive, it is considered to be a backlight state. Comparator (COMP30) is a comparator for low brightness discrimination, and the base voltage of transistor (Q50),
Comparing reference voltages. Others are the same as those in FIG. 22, meaning that the signals (a), (b) and (c) are the same signals as those in FIG. Since the signal (d ') uses CdS as a photoelectric conversion element, it outputs a level different from that of the signal (d) of FIG. 16 under the same brightness, and the amount of change per 1 Ev different. Therefore, in the control circuit of FIG. 17, the analog amount of each of the level shift circuit (100) and the A / D conversion circuit (101) is changed to the analog amount corresponding to the luminance and the change amount thereof when CdS is used. It is necessary.

FIG. 26 shows a third modification of the photometric circuit of FIG. (SP
C31) is the light receiving element (SPC32), (SPC3) used for AE control.
3) is a light-receiving element arranged in the photometric area of (SPC31). FIG. 27 shows an example of this photometric area.

In FIG. 27, (160) shows a photographing screen, (161) shows a photometric area of the light receiving element (SPC31), and (162) and (163) show photometric areas of the light receiving elements (SPC32) and (SPC33), respectively.

Returning to FIG. 26, (D21) is a diode for converting photocurrent into a logarithmically compressed voltage, (AS30) and (AS31) are analog switches for switching the photometric area, and (150) and (151) are the switched photometric areas. A memory circuit for memorizing the brightness value of each, (AS32), (AS33) is an analog switch for switching the above memory circuit, (152) is a level for level shifting the voltage stored in the memory circuit (151) The shift circuit (COM20) is a comparator for comparing the voltage stored in the memory circuit (150) with the voltage level-shifted by the level shift circuit (152), (COM2
1) is a comparator that compares the reference voltage (V20) with the voltage stored in the memory circuit (151), (OSC) is an oscillator circuit, and (153) is a frequency divider circuit that divides the signal from the oscillator. . The operation of the circuit will be described. When the release lead is pressed down to the first stroke and the power supply switch (S1) is turned on to supply power to the photometry circuit, the oscillation circuit (OSC) starts oscillation. Upon receiving this signal, the frequency dividing circuit (153) whose initial state is "L" repeats "H" and "L" at a constant cycle,
It is output as a signal (C1). Another signal (C2)
Outputs "H" shortly before the signal (C1) changes from "H" to "L" or from "L" to "H". Since the signal (C1) is "L" in the initial state, this signal is inverted by the inverter (IN60) and becomes "H", thereby making the analog switch (AS31) conductive. As a result, the light receiving element (SPC3
1), (SPC32), (SPC33) are connected in series. By connecting three light receiving elements in series, a diode (D21)
The current flowing through is regulated by the light receiving element that generates the smallest photocurrent among the three light receiving elements. In other words, it measures the darkest photometric basin and shows its brightness. The signal (C1) is inverted by the inverter (IN61) to make the analog switch (AS32) conductive. By turning on the analog switch (AS32), the voltage of the anode of the diode (D21) logarithmically compressing the photocurrent is sent to the memory circuit (150). Then, shortly before the signal (C1) changes from "L" to "H", the signal (C2) becomes "H", and in response, the AND circuit (G73) becomes "H" and becomes the memory circuit (150). Sent. This signal is a memory start signal for storing the transmitted voltage.
When the signal (C1) changes from "L" to "H", the analog switches (AS30) and (AS33) become conductive. As a result, only the light receiving element performing photometry becomes (SPC1), and a voltage proportional to the logarithm of the photocurrent generated thereby is sent to the memory circuit (151) through the analog switch (AS33). Then, the signal (C2) is generated shortly before the signal (C1) changes from "H" to "L", and the AND circuit (G72) receiving this signal outputs "H" to the memory circuit (151). ,
A memory circuit (151) stores the received voltage. The voltage stored in this circuit (151) is a constant voltage (36 mV corresponding to 2Ev in this case) in the level shift circuit (152).
Voltage) is shifted downward and the comparator (COMP
It is output to the non-inverting input of 20). On the other hand, the voltage stored in the memory circuit (150) is input to the inverting input and compared with the level-shifted voltage. When the output of the comparator (COMP20) is "H", that is, AE control is performed. When there is a brightness difference of a predetermined value or more between the photometric area and the other photometric areas, the backlight state is defined. The comparator (COMP21) compares the voltage of the memory circuit (151) with the reference voltage (V20) to make a low-luminance determination.
The signals (a), (b), (c), and (d) are the same as the signals (a), (b), (c), and (d) in FIG.

FIG. 28 shows a fourth modification of the photometric circuit of FIG. The signal lines of (B1), (B2), and (B3) in the figure are the same as the signal lines (B1), (B2), and (B3) of the dotted line portion in FIG. It is the same as the processing performed on the right side of the dotted line portion in FIG. Transistor (Q40), (Q4
1), (Q42) and (Q43) form a constant current circuit, and the diodes (D30) and (D31) receive this constant current from the collector of the transistor (Q43) and supply a stable voltage. (SPC41), (SPC42), and (SPC43) are light receiving elements, and an example of the photometric area thereof is shown in FIG.

In FIG. 29, (171) is a photographed image, (172), (17
3) and (174) are photometric regions of three light receiving elements.

Returning to FIG. 28, (AS41) to (AS47) are analog switches for switching the above three light receiving elements in series or in parallel, and the transistor (Q44) draws a current equal to the photocurrent (I10) flowing in the diode (D32). Put in. Transistor (Q45)
Corresponds to three transistors, and the current (I11) equal to that of the transistor (Q44) is written as 3S in the figure, but the voltage between the base and the emitter at this time is 1/3 of the current (I12). ) Is the voltage when it flows. Transistor (Q
47) and (Q48) are connected to the transistor (Q45) and the current mirror, and the transistor (Q47) is connected to the above current (I12).
To the diode (D33), while the transistor (Q48)
Since it is composed of three transistors, a current equal to the current (I11) flows through the diode (D43). The logarithmic compression voltage corresponding to these currents is buffered (Buf2
0), (Buf21) to the memory circuit (Fig. 26).
Next, the operation of the circuit will be described. When the release lead is pressed down to the first stroke, the power supply switch (S1) is turned on, and power is supplied to the photometric circuit, the signal (C1) is output as the initial state (Fig. 26).
Is output to the signal line (B3) and this signal is
70), the analog switch (AS46), (AS
47) becomes conductive, and the light receiving elements (SPC41), (SPC42), (SPC4)
3) are connected in series. As described above with reference to FIG. 26, this measures the darkest photometric area. A photocurrent corresponding to this brightness flows in the diode (D32), and a current equivalent to this flows in the diode (D34) by the transistors (Q44), (Q45), (Q48), and the logarithmically compressed voltage is output by the buffer (Buf20). ) Sent to. Signal (C
When 1) changes from "L" to "H", the analog switches (AS41), (AS42), (AS43), (AS44) become conductive, and the light receiving elements (SPC41), (SPC42), (SPC43) are connected in parallel. Connected to. As a result, the photocurrents of these three light receiving elements all flow to the diode (D32). Then, with the transistors (Q44), (Q5), and (Q47), the diode (D32)
The average (1/3) of the current that flows in the diode (D33)
Flow, logarithmically compressed voltage is sent to the buffer (Buf21). The outputs of the buffers (Buf20) and (Buf21) are taken into the memory circuits (Fig. 26) (150) and (151) at the above-mentioned timings and used for control.

In the above example shown in FIGS. 20 and 21, the guide number of the strobe is switched by the distance signal from the AF circuit. As shown in Table 4, when a film with ISO speed of 100 is used and the main subject is at a medium distance of 1.4m to 2m,
Select a small guide number. However, in the above example, since natural light is bright in the backlit state, when the aperture is closed on the small aperture side, the amount of strobe light that contributes to the exposure is reduced and the main subject is underexposed. For example, when a film with ISO sensitivity of 100 is used and the brightness of natural light (Bv) = 8 and the distance of the main subject (D) = 1.4 to 2 m, the aperture and shutter speed determined by AE control are aperture F (NO) = 8. , Shutter speed (SS) = 1/125. The proper aperture when the strobe light of the main subject at this distance is used is (FNO) = 3 because the strobe guide number (GN) = 6. If the shutter is closed with the aperture (FNO) = 8 by AE control, the main subject will be under 3Ev, resulting in underexposure. This is when considering the latitude of the film,
There is almost no detailed content of the main subject on the film, for example, image information showing facial expressions, and when developed, it becomes a so-called silhouette photograph. In order to correct this, in the case of a backlit state, the one with a larger amount of strobe light is used. As a result, in the present embodiment, the guide number is changed from 6 to (GN) = 12, the main subject is corrected to about 1 Ev under, and the image information appears on the face and the like, so that the photograph can be seen sufficiently. FIG. 30 shows a circuit in which a part of the circuit shown in FIG. 20 is modified to do this. In addition to FIG. 20, FIG. 30 shows the OR circuit which is a signal for switching the guide number of the strobe light by inputting the signal (a) indicating “H” in the backlight condition and inverting it by the inverter (IN80). Input to the AND circuit (G80) together with the output of (OR33). As a result, in the backlit state, an "L" signal indicating the strobe light with a large guide number is output from the AND circuit (G80) and the strobe light with a large guide number is emitted.

Generally, if you use flash exposure with AE-controlled exposure (aperture), the exposure of the main subject will be (AE exposure) + (exposure with strobe light)
Becomes On the other hand, the background exposure is (AE control exposure).
There is a brightness difference between the brightness of the main subject and the average metering (background),
At this time, if strobe light is emitted, correction is performed by the amount of (exposure by strobe light) described above, and the difference in brightness is reduced. However, the brightness difference (exposure difference) may be large even with such a method. In such a case, in order to reduce the brightness difference (exposure difference) as much as possible, the characteristic of the shutter that also serves as the diaphragm is utilized as follows. When using the shutter that also serves as the aperture, changing the exposure of the AE control changes both the aperture and the shutter speed. On the other hand, exposure with strobe light is determined only by the aperture value. Therefore, if the exposure of the AE control is shifted to the under side by a certain value, the change in the exposure of the strobe light due to this shifts to the under side by the amount of the change in the aperture, so the exposure of the back shadow where the strobe light does not reach (AE control Exposure) and the exposure of the main subject by the strobe light are less to the left. For example, there is a 3Ev difference between the brightness of the background (exposure for AE control) and the brightness of the main subject.
It is assumed that the difference in exposure becomes 2 Ev by emitting strobe light with the aperture value determined by the control. Now, assume that when the exposure of the AE control is changed, the change of the aperture and the change of the shutter speed change 1: 1. At this time, if the exposure determined by the AE control is shifted to the 2Ev under side, the aperture will be 1Ev under, and the exposure with the strobe light will also be 1Ev under, and the difference in exposure between the background (exposure with AE control) and the main subject will be It will be 1 Ev. This will be described with reference to FIGS. 31 and 32.

FIG. 31 is a circuit diagram in which a part of the control circuit of FIG. 17 is changed,
The major change is that the light emission amount control circuit (110) is eliminated and the FM circuit is configured to include the function of the light emission amount control circuit.

FIG. 32 is a specific circuit diagram of the modified FM circuit (160). (161) is the AF signal from the AF circuit and I from the Sv circuit
This is an FM decoder that receives the SO sensitivity signal as input, selects the aperture value when the guide number is large, and outputs a signal corresponding to this. (162) is an addition that receives the signal corresponding to the aperture value from the FM decoder (161), shifts this to the open aperture side by a fixed value, and outputs the signal of the appropriate aperture value when the guide number is small. Circuit, (163), (164)
A comparison circuit that compares the aperture value signal sent from the AE circuit (105) with the aperture value signal output from the FM decoder (161) and the aperture value signal output from the adding circuit (162), respectively. 166) selects the aperture value signal output from the FM decoder (161) and adder circuit (162) based on the signal from the comparison circuit (164) and outputs the selected signal to the data selector (167). Data Selector, (165)
Is a subtraction circuit that shifts the aperture value for AE control sent from the AE circuit (105) in FIG.
7) selects the aperture value output from the data selector (166) and the adder circuit (165) based on the signal from the comparison circuit (163), and selects the selected signal from the coincidence detection circuit (16).
The data selector, (168), which outputs to (8), sends the signal indicating the shutter position (aperture) from the shutter position detection circuit (102) in FIG. 31 and the data selector (167) when the shutter starts to open. It is a coincidence detection circuit that detects that the signal indicating the aperture value is the same and outputs "H" at that time.

To explain the operation of the circuit, the FM decoder (161) inputs the AF signal from the AF circuit and the ISO sensitivity signal from the Sv circuit as described above, and outputs the larger guide number ((GN ) = 12) is selected, the aperture value that gives the proper exposure is selected and output. The selected and output aperture value signal is input to the comparison circuit (163), and this signal and the aperture value signal for AE exposure sent from the AE circuit are compared in this circuit (163). The other comparison circuit (164) is AE
Aperture value signal sent from the circuit and the aperture value selected by the FM decoder (161) from the adder circuit (162) to the open side by a fixed value, that is, the smaller guide A signal indicating the aperture value that provides the proper exposure when the number is selected is input, and they are compared. That is, the comparison circuit (164) uses the aperture value determined by the AE control to determine whether or not the main subject is properly exposed when the flash light is emitted with the smaller guide number. Then, as a result of this discrimination, when the strobe light emission with a small guide number is also appropriate, this output is sent to the inverter (IN14) in FIG. Similarly, the comparison circuit (16
In 3), it is determined whether or not the main subject has the proper exposure when the strobe is fired with the larger guide number using the aperture value determined by the AE control. Both comparison circuits output "H" if the main subject has a proper exposure and a "L" if the exposure is not proper when the strobe light is emitted at the aperture value determined by the AE control. This is shown in Table 5.

In FIG. 32, the output of the comparison circuit (164) for comparing the output of the addition circuit (162) and the output of the FM decoder (161) is sent to the data selector (166) as it is. The data selector (166) selects the aperture value signal sent from the FM decoder (161) and the adder circuit (162) based on the sent signal. More specifically, when the flash is fired with a small guide number to achieve proper exposure, the comparison circuit (164) outputs “H”, and the data selector (164) that receives this outputs the output from the addition circuit (162). The selected aperture value signal is selected and output to the data selector (167). When the flash is fired with a large guide number and the proper exposure is obtained (underexposure with a flash with a small guide number), the comparison circuit (164) outputs "L" and the data selector (166) which receives this Selects the aperture value signal output from the FM decoder (161),
Output to the data selector (167). When the proper exposure is not obtained even if the flash is fired with a large guide number, the signal “L” indicating this is output from the comparison circuit (163) to the OR circuit (O).
It is output to R100). The other input of the OR circuit (OR100) is a backlight signal (a) that indicates "H" in the backlight condition.
Is the signal inverted by the inverter (IN100), and if the backlight state is present, this input signal shows "L". Therefore, the output of "L" of the comparison circuit (163) is output to the data selector (167), and the data selector (16) receiving this is output.
7) selects a signal of a smaller aperture value obtained by shifting the aperture value signal for AE exposure output from the subtraction circuit (165) by a predetermined value, and outputs it to the coincidence detection circuit (168). The coincidence detection circuit (168) outputs "H" to the AND circuit (G100 when the aperture value signal sent from the data selector (166) and the signal indicating the shutter position (aperture) from the shutter position detection circuit coincide. ) And the OR circuit (OR14) in FIG. 31. The output of the AND circuit (G100) is the AE magnet (AEM
sent to the OR circuit (OR12) that controls g). In this way, in this example, when the main subject is not properly exposed even if the flash is fired with a large guide number in the backlight condition, the AE control is shifted to the underexposure side and the flash is fired. Then, (1) in the case of backlighting and the voltage of the main capacitor does not reach a predetermined level. (2) in backlighting and at infinity, a problem occurs.

These reasons will be described for the above two cases.

(1) When the voltage of the main capacitor does not reach the predetermined level in the backlight condition At this time, since the voltage of the main capacitor does not reach the predetermined level, the exposure correction (backlight correction) of the main subject by the strobe light cannot be performed. Therefore, in FIG. 31, the level shift circuit (100) shifts the brightness value sent from the photometric circuit (FIG. 16) to the smaller side, and the AE circuit (105) uses this brightness value as the basis. The exposure value is shifted to the over side as compared with the case where the exposure control is performed and the exposure value is controlled with the brightness value before the shift. However, when the subject is backlit, the aperture is small because the area measured by average metering is bright, and the strobe light does not reach sufficiently even if the strobe is fired with a large guide number. Similarly, when the subject is backlit, the distance to the main subject is relatively large, and even if the strobe is fired with a large guide number, the strobe light still does not reach sufficiently. At these times, the exposure value sent from the AE circuit (105) is shifted to the under side regardless of whether or not the voltage of the main capacitor has reached a predetermined level. As shown above, in FIG. 31, the exposure value shifted to the over side is shifted to the under side and returned to the original because the voltage of the main capacitor has not reached the predetermined level, and no backlight compensation is performed. It will be.

(2) When the subject is in the backlit state and at a long distance At this time, the backlight is in a backlit state and the luminance value by average photometry is relatively large, so the aperture is on the small aperture side and the main subject is at a long distance, so Since the emission of light does not contribute to the exposure of the main subject, the emission of strobe light is forcibly prohibited. Even at this time, even if the strobe with a large guide number is fired as in (1), the light does not reach the main subject sufficiently.
The exposure value sent from 5) is shifted to the under side. However, since the flash light emission is prohibited, even if the exposure value is shifted to the under side, the backlight compensation is not performed and the exposure is underexposed.

Therefore, in the cases of (1) and (2) above, the OR circuit (OR12)
In order to prevent the shutter closing signal from being output from the FM circuit (108), that is, to prevent the exposure value from being shifted to the under side, the charge indicating "L" when the voltage of the main capacitor does not reach the predetermined level. Inverter (IN1) that has inverted the output of the completion signal (j) and the AND circuit (G24) of FIG. 31 showing "H" in the backlit state and at a long distance.
The output of 02) is input to the AND circuit (G100), and
The shutter is controlled by the signal from the AE circuit (105). Further, in the present embodiment, the stroboscopic light emission is performed at the timing when the shutter is opened up to the smaller aperture value of the aperture values determined by the FM control and the AE control. Therefore, when the aperture determined by FM control is a smaller aperture, it is output from this signal coincidence detection circuit (168),
OR circuit (OR12) of FIG. 31 through the AND circuit (G100)
The background is underexposed because the shutter is closed at this timing. In this example, the comparator circuit (16) closes the AND circuit (G100) except when it is necessary to shift the AE exposure to the under side to avoid this.
The output of 3) goes through an OR circuit (OR100) and an inverter (IN101) that inverts the output, and the AND circuit (G100).
Has been entered in. Therefore, when it is not the backlight state, the signal of "L" of the signal (a) showing the backlight state is the inverter (IN
100) reverses to "H", and A
E When the flash is fired with a large guide number with a controllable aperture value and it becomes appropriate, the output of the comparison circuit (163) becomes "H".

Although the illustrated embodiment has been described above, the present invention is not limited to the above embodiment. For example, an electric signal is output to the strobe circuit to prohibit strobe light emission.
A switch may be provided in the trigger circuit that triggers strobe light emission, and a strobe light emission prohibition signal may be provided to open the strobe light emission prohibition signal to inhibit strobe light emission. The light quantity of the strobe light is switched using two capacitors, a large one and a small one, but the light quantity may be switched by using this as one condenser and changing the light emission time. To
ISO sensitivity 100, 200, 400, 1000, 4 different distance settings,
The circuit configuration corresponding to this was adopted for medium, long, and infinity distances, but the ISO sensitivity and distance setting method is arbitrary,
The circuit configuration may be changed according to them. See also Figure 16,
Regarding the light receiving element in FIGS. 22, 25 and 26,
At the same luminance, the average photometric element and the partial photometric light receiving element assume that photocurrent is flowing, and the raising voltage, the drop voltage, and the level shift for discriminating the luminance difference,
Although only the voltage corresponding to the brightness difference was taken into consideration, if there is a photocurrent difference between the two light receiving elements at the same brightness, only the voltage corresponding to the current difference, the raising voltage, the drop voltage and the level. Correct the shift.
Further, whether the brightness is low or not is determined and the exposure is shifted to the over side by the voltage indicating the brightness or the Bv of the apex. You may stay. At this time, the low-luminance determination may be performed by changing the reference voltage of the comparator performing the low-luminance determination to a variable voltage that changes according to the ISO sensitivity.

EFFECTS OF THE INVENTION According to the present invention described above, exposure control is performed when charging of the main capacitor is not completed when the backlight condition is detected, or when the distance from the camera to the subject is infinity. Is shifted to the overexposure side, the exposure of the person is good even without the strobe light. Further, it is not necessary to wait for photographing until the charging voltage of the main capacitor for stroboscopic light emission reaches a predetermined level, and it is possible to obtain the effect of not missing a photo opportunity. Further, since the stroboscopic light emission is forcibly prohibited when the above exposure is shifted to the over side, the main subject will not be overexposed.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of the present invention, FIG. 2 is a photometric region diagram showing a first example of an average photometric region and a partial photometric region, and FIG.
FIG. 4 is an explanatory diagram showing a photometric range of a person in FIG. 2, FIG. 4 is a photometric region diagram showing a second example of an average photometric region and a partial photometric region, and FIG. 5 is two partial photometric regions. Among them, an explanatory view showing an example in which at least one is not completely covered by a person, FIG. 6 is an explanatory view showing an example in which two partial photometric regions are completely covered by a person, and FIG. It is explanatory drawing which raised the numerical value of the range which can be metered of a person when using two partial metering areas, (1) is an average shoulder width of a person, (2) is 4.5 m in distance. How to obtain the photometric angle of the shoulder width of a person in (3) is the photometric area occupied by the light receiving element having a light receiving angle of 2.5 ° to the shoulder width of the person, and (4) is the measurable range of the person at this time. And FIG. 8 are explanatory views showing the photometric range of the person in FIG. 4, and FIG. Is a photometric area diagram showing a third example of an average photometric area and a partial photometric area, and FIG. 10 is an explanatory diagram showing the photometric range of a person in FIG. 9, FIG.
(1) and (2) are photometric region diagrams showing a modified example of FIG.
FIG. 12- (1) and (2) are photometric region diagrams showing a fourth example of the average photometric region and the partial photometric region, and FIG. 13 is a photometric region showing the fifth example of the average photometric region and the partial photometric region. FIG. 14 is an area diagram, FIG. 14 is a configuration diagram showing a circuit configuration of the entire camera, and FIG.
FIG. 14 is a detailed circuit diagram of a block (A) which is a power supply holding circuit, and FIG. 16 is a detailed circuit diagram of a block (B) which is a photometry circuit and a ranging circuit shown in FIG. FIG. 17 is a detailed circuit diagram of the control circuit block (C) shown in FIG. 14. FIG. 18 is a detailed circuit diagram of the boost control circuit block (D) shown in FIG. Fig. 19 shows the circuit diagram
FIG. 20 is a detailed circuit diagram of the block (E) which is the strobe circuit shown in FIG. 14, FIG. 20 is a detailed circuit diagram of the light emission amount control circuit shown in FIG. 17, and FIG. 22 is a detailed circuit diagram of the FM circuit shown in FIG. 22, FIG. 22 is a circuit diagram showing a first modified example of the photometric circuit shown in FIG. 16, and FIG. 23 is a case where CdS is used as a light receiving element. FIG. 24 is a pattern diagram of a light receiving element, FIG. 24 is a circuit diagram showing an equivalent circuit of CdS shown in FIG. 23, and FIG.
FIGS. 5 and 26 are circuit diagrams showing second and third modified examples of the photometric circuit shown in FIG. 16, respectively, and FIG. 27 is a photometric region of the light receiving element used in FIG. FIG. 28 is a circuit diagram showing a fourth modification of the photometric circuit shown in FIG. 16, and FIG. 29 is a photometric region of the light receiving element used in FIG. A photometric area diagram showing an example, FIG.
Circuit diagram showing a modified example of the light emission amount control circuit shown in the figure,
31 is a circuit diagram showing a modification of the control circuit shown in FIG. 17, and FIG. 32 is a circuit diagram showing a modification of the FM circuit shown in FIG. (200) …… Backlight detection means (201) …… Strobe means (202) …… Charging completion detection means (203) …… Exposure control means (204) …… Correction means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takeo Takarada, 2-30 Azuchi-cho, Higashi-ku, Osaka-shi, Osaka Prefecture Minato Camera Co., Ltd. (72) Hiroshi Mukai 2-chome, Azuchi-cho, Higashi-ku, Osaka-shi, Osaka No. 30 Osaka Osaka International Building Minorta Camera Co., Ltd. Examiner Hidejiro Yokobayashi (56) Reference JP-A-58-107521 (JP, A) JP-A-50-131524 (JP, A) JP-A-49-90927 ( JP, A) JP-A-60-76724 (JP, A)

Claims (1)

[Claims] 1. A backlight detecting means for detecting a backlight condition, a strobe means including a main condenser, a charge completion detecting means for detecting whether or not charging of the main condenser is completed, and a distance from a camera to an object. Distance output means to output, exposure control means to control the exposure of the camera, and when the backlight is detected, the main capacitor is charged and the distance from the camera to the subject is not infinity When the main condenser is not fully charged or the distance from the camera to the subject is infinity, the flash firing is prohibited and the correction means is provided to correct the exposure. Exposure compensation device.