JPS62255926A - Exposure controller - Google Patents

Abstract

PURPOSE:To obtain always a correct exposure for an object by measuring the light of a relatively wide area of a photographic range to operate the first photometric value obtained by approximately averaging the luminance of the whole of the photographic range. CONSTITUTION:If the difference between the first photometric value (averaged light measured value) by the first photometric means and the second photometric value (spot light measured value) by the second photometric means is larger than a prescribed value, a rear light discriminating means decides the rear light estate. When flash photographing is performed in accordance with an aperture value determined by the first exposure value operated on a basis of the first photometric value, it is preliminarily discriminated by the discriminating means whether a correct exposure can be obtained with only the quantity of flash light or not. If the rear light state is decided and the correct exposure for the object can be obtained with the first exposure in case of synchro-flash photography in the daytime, flash photographing is performed on a basis of the first exposure value. If the correct exposure cannot be obtained by a flash light emitting means, the flash light emitting device is not allowed to emit light and the exposure control is performed by an exposure control means in accordance with the second exposure value operated on a basis of the second photometric value.

Description

[Detailed description of the invention]

Product 3 votes 201” Ltv- This invention is camera exposure control! More specifically, the present invention relates to an exposure control device that differentiates backlight conditions by tq and performs flash photography so that an appropriate exposure amount can be obtained for the main subject even in backlight conditions.

[Shiohe W System Special Publication No. 55-29408 states that in a camera that has a spot photometer and an average photometer, if the difference between the spot photometer value and the average photometer value exceeds a predetermined value, it is determined that the camera is backlit. An exposure control device has been proposed that is configured to perform so-called mouth synchronization photography by causing a flash device to emit light at t1 and perform flash photography. However, with this conventional device, (1) when performing medium synchronized photography, the exposure amount is determined based on the average photometric value, and (2) the aperture value of the photographing lens is determined according to the exposure style. The camera is configured to determine this and perform flash photography. Therefore, depending on the determined aperture value and the amount of light emitted by the 7-lash device, the subject distance at which an appropriate exposure can be obtained according to the principle of 7-lash is determined, and the appropriate exposure amount cannot be obtained for the actual subject. there is a possibility. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an exposure system 1llxr11 that can always obtain an appropriate exposure amount for a subject regardless of the subject distance even when performing synchronized photography during the day. In order to achieve the above-mentioned objective L1, the exposure control device according to the present invention meters a relatively wide area of the photographing range and adjusts the brightness of the entire photographing range. i) A first photometry means that calculates an averaged first photometry value, and measures light in a relatively narrow area of the shooting range, and calculates a value for that area. Calculate the photometric value of tS2! 52
A photometric means, a distance measuring means for measuring the distance to the subject, and a flash emitting means for flash photography, and the first photometric value and the second photometric value are compared, and both photometric values are calculated. a backlight tq constant/stage that determines that a backlight condition exists when the difference is greater than or equal to a predetermined value; and a first exposure value that is a combination of an aperture value and an exposure time based on the first photometric value. a second exposure calculation means for calculating a second exposure value consisting of a combination of an aperture value and an exposure time based on the second photometric value; When performing flash photography using an aperture value, the aperture value,
Based on the measured distance to the subject and the amount of light emitted by the flash light emitting means, is it determined whether the amount of exposure to the subject is appropriate based only on the amount of light emitted by the flash light emitting means? -1
If it is determined that there is a backlight condition, tq
If it is determined by another means that the exposure style for the subject is appropriate using only the flash light emitting means, flash photography is performed using the flash light emitting means and the exposure operation is controlled based on the first exposure value, and the flash light emitting means is used to control the exposure operation based on the first exposure value. The present invention is characterized by comprising an exposure control means that controls the exposure operation based on the second exposure value without performing flash photography if it is determined that the exposure amount for the subject is not appropriate based only on the light emitting means. Therefore, according to the present invention, when the difference between the first photometric value (so-called average photometric value) and the second photometric value (so-called spot photometric value) exceeds a predetermined value, it is determined that the backlight condition is caused by tq. In addition, when performing flash photography with the aperture value determined by the first exposure value calculated based on the first photometric value (average photometric value), it is necessary to check whether an appropriate exposure amount can be obtained with only the amount of flash light emission. tq is set in advance, and if it is a backlight condition, fl
When performing daytime synchronized photography under I mode, if the first exposure value provides the appropriate exposure for the subject, flash photography is performed based on this first exposure value, and the appropriate exposure is obtained. When it is not there, it emits a flash! Exposure control is performed based on the second exposure value calculated based on the second photometric value (spot photometric value) without causing the IA position to emit light. (Left space below) Below, an embodiment in which the present invention is applied to a lens shutter camera will be described with reference to the accompanying drawings. First used in the example 1
The principles of distance detection and brightness detection will be explained. This distance detection device includes a light projector that emits a circle over the entire field of the subject whose distance is to be detected, a light receiver that receives the light reflected from the subject, and a signal that processes the signal from the light receiver. It consists of a circuit that detects the distance to the subject and the brightness of the subject. In this embodiment, the light-receiving means is composed of a current number of light-receiving ZTs, and these light-receiving elements divide the object field into a plurality of regions, detect the distance of each region, and use the light-receiving elements for photographing. The rangefinder, that is, the area at the distance where the photographic lens is focused, is detected, and the brightness of that area is detected, assuming that the main revised manuscript exists in this detected area.
I try to do that. However, in this embodiment, a common light receiving means is used for distance detection and brightness detection. An example of a combined optical system that shares light reception T=El in this way will be explained with reference to FIG. (E'L2) is the above role round hand f2
It is an electrician's flash device, and through a filter (r r <t・'I) installed in the 11 TI that transmits infrared light in a specific boyfriend or/and area, it emits light to the entire entertainment world. irradiate. The yt and quantity of this electronic flash device (F L 2) are as follows:
Compared to the light mouse of the l device, the number is very small. (LE)
is a condensing lens that condenses the light reflected from the subject book (0[3) and guides it to the light receiving device (spc), and this lens (LE
) and photodetector fi'1 (SPC),! =4) between 45
a filter that transmits infrared light in the constant wave 1i or wavelength range;
A filter having visibility characteristics and a filter having a switching IIT function (LCDPI) are provided. This filter (LCDFI> may be configured, for example, as shown in No. 2 and 1. That is, this filter (LC
I) Fl) is connected to the liquid crystal display (LCDI) and (LCD2) of the host plastic, and is connected to the terminal (
When No. 13 of OPl) and ``)Ii61+'' level (hereinafter referred to as [11J) is output, a predetermined voltage 2 is applied to the first liquid crystal (L CO1) through buffer 7 (BuF).
When the voltage is applied, the ff1-n I crystal (LCD1) becomes able to transmit infrared light in a specific wavelength range. On the other hand, “Lo-
” level (hereinafter referred to as rLJ) signal is sent to the microcomputer (MC
) is output from the output terminal (OPl) of the buffer (
A predetermined voltage v2 is applied to the second liquid crystal (LCD2) via the inverter (I3uF) and the inverter (IN1), so that the second liquid crystal (LCD2) operates as a visibility filter that transmits light in the visibility range. become. In addition, the above buffer (
f3ur') and the inverter (IN2) are configured to be powered by a power supply voltage (v2), which will be described later.
Therefore, when a release button (not shown) is not pressed, no voltage is applied to both liquid crystals (LCDI) (1, CD2) and they are in a colorless light transmitting state. The light-receiving device (sr'c) shown in Fig. 1 is composed of a plurality of light-receiving elements as described above, and is designed to measure each of the plurality of regions ■ to ■ on the far side W shown in the square frame in Fig. 13. It has become. As shown in Fig. 3, the plurality of light receiving elements are arranged so as to define an area slightly below the center of the photographing range. There are a total of nine light-receiving elements (C) including this light-receiving element at the left, right, upper and lower end, and I-name, with the center as the center, and distance detection and 111 degree detection are carried out in measurement areas (1) to (2) indicated by diagonal lines, respectively. In this way, the reason why the entire measurement area is placed slightly below the photographing range (field) is because lens-shutter cameras with relatively wide-angle photographing lenses can capture objects that are considered to be photographic objects or limbs. This is because there are not many people in the upper part of the shooting range, but there are many people in the lower part. Next, a camera system that performs the distance detection and C/luminance detection described above will be described. In Figure 1072 of Figure 4, which shows the outline of the circuit configuration of the entire camera, (E) is the tll battery pack,
Two v lithium batteries are used. (Dl) is an electronic flash device r! This is a diode that prevents the power supply voltage to the microcontroller < MC from decreasing when the booster circuit in 1 (["L) is driven. (CO) is a diode that prevents the voltage supplied to the microcontroller < MC) from decreasing when the booster circuit in 1 (["L) is driven. A capacitor (C1) is provided to speed up the charging of the main capacitor in the microcontroller (MC). A relatively large capacitor (R1) and (C2) is used as a backup for the microcomputer (MC).
are the microcontroller (MC) when the power battery (E) is installed.
This is a reset resistor and capacitor to reset the . (SW) is a switch group including m-loss switches required for the operation of the device/equipment of this embodiment.
This will be described later using figures. (DI) is a display circuit that displays shooting information, (FI)
The liquid crystal filter shown in FIG. 2 is an infrared filter or a visible light filter as described above. A microcomputer (MC) is used to control the entire circuit. (Is) converts the film sensitivity read from the food pattern provided on the film container or the film sensitivity set manually into the film sensitivity value converted to the apex value, that is, the speed value (SV), and sends it to the microcomputer. The film sensitivity setting circuit outputs to (MC), and (LM) is electronic/flash Mi? for distance measurement (hereinafter referred to as AF), which will be described later. i
(F L 2 ) and receives the light reflected from the subject, and detects the distance k[distance of the subject iIl! This is an aperture distance/photometering circuit consisting of a circuit and a photometering circuit that measures the brightness (BV) of a subject. (AE) is an exposure control circuit that controls exposure based on the exposure value (EV) output from the microcomputer (MC), and this circuit (AE) causes the electronic flash device (1・'L) to emit light at a predetermined timing. Start fIf No. (Xl
) is output. (AFC) is an AF control circuit that drives the photographic lens to a predetermined position based on AF data indicating the subject distance output from a microcomputer (MC), and (MO) is a motor (N()) that advances the film. (1"L) is an electronic flash device, which is connected to an electronic flash device (F L 2) with an all distance I11 and an electronic flash device (I"Ll) for illuminating the subject during shooting. (Tri) is made conductive according to the signal from the microcomputer (MC1), and when it is made conductive, the filter (FI) and film sensitivity setting circuit 11a (
Is), metering 1i/light metering circuit (LM), exposure control circuit (A
E), AF control circuit (8 ['C)-], and motor control circuit (MO), respectively. FIG. 5 shows a specific example of the switch group (SW) in FIG. 4. (SO) is l]I(1ff
This is a lens cover switch that turns 0N10FF in conjunction with L'1lflu, and depending on the ON10FF of this switch (SO), the delay circuit (DEL) and L'1lflu approximately 1lfl
A microcomputer (M
C) The pulse number 4H7 is output to the interrupt 427 (INTO). The microcomputer (MC) uses its interrupt terminal (INTO).
), when this pulse signal is input manually, a predetermined interrupt routine (lNTf) is executed. (Sl) is a shooting preparation switch that is turned on when the release button (not shown) is pressed down to the first stroke.If this switch (Sl) is turned on while the lens cover is open, the interrupt routine (INTI) is activated.
) is executed. (S2) turns ON when the release button is pressed down to Pt52 stroke O-, which is deeper than the first stroke.
This is a release switch. (S3) is when exposure is completed, and the shutter is turned OFF in response to completion of charging of the shutter termination by a shutter charging member (not shown) that charges the side to the initial state, and is turned OFF in response to completion of the exposure operation.
N is given. (s, i) is a one-frame winding switch, which is turned off when the exposure operation is completed, and turned on when winding of the film one frame is completed. (SS) is controlled by the photographic lens.
This is a switch that is turned ON when it is extended to a predetermined position according to No. 1, and is turned OFF when the Nyattachano member completes charging of the shutter termination. Next, details of the distance measuring/photometering circuit (LM) for detecting distance and brightness used in the present χ embodiment will be explained with reference to the block diagram of FIG. (LMI) and -(LM9) are ranging/photometering circuits that perform distance detection and (/XII degree detection) for each of the measurement areas ■ to ■ shown in Figure 3. , the light-receiving element responds to a signal from a timing circuit (TM) that generates a signal to latch the signal from the light-receiving element at the timing when the intensity emitted from the electronic flash device (FL2) almost reaches its maximum intensity. Latch the signal from, that is, the distance signal, and select this (,
EI-). The selector (SEL) is a decoder (D) that decodes the signal from the microcomputer (MC).
The ranging/photometering circuit (■,
Select signals from Ml) to (LMri) and use the encoder (
ED). This encoder (CD) converts the input signal into a predetermined (
ff code and output to the microcomputer (MC). Therefore, the distance signals from the ranging and dual optical circuits (LMI) to (LM9) are output to the microcomputer (MC) via the selector (SEL) and encoder (ED) in sequence according to the signal from the microcomputer (MC). be done. On the other hand, the luminance signal indicating the luminance of the manuscript, which is output from the ranging/photometering circuits (LMI) to (LM9), is output as an analog signal to the analog switch (ANSW).This analog switch (ANSW) 9 I”E 1
”, and this FET is composed of Ell in each region.
The distance measurement/photometering circuit (LMI)
) to (LM9), and the outputs of each FET are all integrated into a single line to be used as an A/D conversion circuit (A/D converter circuit).
D). This analog switch (A
NSW) is selected by the decoder (D E
2)). That is, the FETs connected to each of the nine ranging/photometering circuits (LMI) to (LM9) are sequentially selected by the microcomputer (Me),
Analog numbers 4 and 1 corresponding to the subject brightness measured by the distance/photometering circuits (LMI) to (LM9) are sequentially output from the analog switch (ANSW). A via analog switch (ANS~■)
The luminance signal output to the A/D conversion circuit (A/D) is converted to a dinotal (?) signal by this A/D conversion circuit (A/D) and output to the microcontroller (MC). The details of the ranging/photometering circuit (LMI) and timing circuit (TM) in the figure are explained with reference to Figure 7.
ru. In FIG. 7, the part surrounded by a dotted line is a timing circuit, and the rest is a distance/photometering circuit (LMI). The timing circuit (TM) will be explained first. When you press the release button (not shown), the electronic flash device for distance measurement (
Before the I/P L2) emits light, the microcomputer (MC> terminal (
opa), the FA signal of IIJ is output and the transistor (Tr2) is turned on, discharging the charge in the timing capacitor (C3). Immediately before light emission, this transistor (Tr2) is turned off and waits for light emission.The 7-ohm Y transistor (PHTl) charges this capacitor (C3).
) is an electronic flash device for distance measurement! ! It is arranged near the light emitting section (I' L 2 ) and directly receives the emitted light. In this state, electronic flash V device (FL2
) emits light, a current corresponding to the intensity of the current is passed through the 7-inch transistor (I'HTI) to the timing capacitor (I'HTI).
C3), and the charging voltage of this capacitor (C3) is Jl! When the i quasi-voltage (Vrl) is exceeded, the comparator (
COMPI) is inverted and outputs No. 43 of "11". This (75; of “IIJ” is the Funcitat circuit (O8
I), and is input to a terminal (T) of a D7 lip 70 tube (D F F 1 ), which will be described later, to latch the amplified signal from the first light receiving element (SPCl). Here, the reference voltage (Vrl) is the electronic/flash device (
It is determined that the comparator (COMP1) is inverted when the light emission intensity of FL2) drops only slightly from the maximum. Next, the distance measuring/photometering circuit (LMI) will be explained. When the first stroke of the release button is pressed, a voltage is applied to the power supply line V2, and power is supplied to each circuit. Then, immediately connect the microcontroller (MC) terminal (OI'9) to l.
-111 No. 13 is output and the analog switch (AS
IHAS2) are both turned on, and the constant current source (11) (
12) The constant current from 17+V will be applied. Here, the constant current from the constant current source (11) is assumed to be 11, and the constant current from the constant current source (2) is assumed to be 12. After a predetermined period of time has elapsed since both of the analog switches (ASI) (AS2) were turned on, the distance measurement/photometering circuit (LMI) enters a stable state. (In this example, at least 20m5ec is the IL
'／It is devoted to In. ) To briefly explain the circuit operation until this circuit (LMI) becomes stable, when a constant current of 11.12 is applied from the constant current source (Il) (r2), l: is the capacitor (C4). (Hereinafter, this capacitor is referred to as a steady charging capacitor) Since the voltage of the capacitor is very low, the transistor (Tr3) is not turned on, and charging is performed according to the potential brightness of the specific wavelength that has passed through the constant voltage ill and filter. The current IP is a transistor ('r"・t)
It flows to the base of the song, and here it is enhanced. This amplified "4 current" flows through one runnoster (Try) (C), and an equivalent current flows from this transistor (Try) and the transistor (1'r?) connected to the current mirror. A part of the current is the current of the constant current source (I2), and the remaining current is the current of the diode (1) 2 ) ([) 3 )
flows to As a result, a voltage (VD>) corresponding to two stages of diodes corresponding to the charging current IP and the constant current ■1 is generated at the non-inverting input terminal (+) of the operational amplifier (Or'l). Basic 1 to reverse input terminal (-)
voltage (Vr2), the voltage (Vl')) corresponding to the diode 2f2 is applied to the non-inverting input terminal 7-(+), and the transistor (Tr
Apply negative feedback to 3). The current flowing out of the transistor (Tr7) is a current that amplifies almost all of the charging current IP and the constant current 1, so the voltage (VO) for two stages of diodes generated by this current is: Standard τ pressure (Vr2)
It is higher than that. Therefore, the operational amplifier (Or”l
) is connected to a constant light capacitor (C4) in order to increase the base voltage of the transistor (Tr3). Here, this capacitor (C4) is a transistor (T
+・4). Then, the voltage of the steady charging capacitor (C4) increases and the transistor (Tr3)
When turned on, constant current It and charging iiQ I P flow through the collector of the transistor (Tr3), so
The base current flowing through the transistor ('rr4) decreases. As a result, the current flowing through the transistor (T+ 6) and the transistor (Tr7) decreases, and the diode 2
The voltage (VD) for each stage decreases. Then, the above-described operation is performed until the voltage (VD) for two stages of diodes becomes equal to the reference voltage (Vr2). In addition, during this work 11 (during a transient phenomenon), the voltage for two stages of diodes (vp) may become lower than the basic voltage (Vr2). In this case, the operational amplifier (OPl) is Capacitor (C4)
As a result, the current that draws the constant current 11 and charging current IP of the transistor (Tr3) decreases, and the base current of the transistor (Tr4) increases. Therefore, the current flowing through the lannostars (Tr6) and (Tr7) increases, raising the voltage (VD) for two stages of diodes. With the above operation, this circuit becomes stable and the transistor (
A current approximately equal to the sum of constant current II and charging current IP flows through Tr3), and the voltage of the steady charging capacitor (C4) is equal to the above constant current ■1 and charging? The base HI of the transistor (Tr3) corresponds to the sum of 1LIP. In this condition, the electronic flash device for distance measurement (['L2)
When the light is emitted, the light reflected from the subject enters the light receiving element (SPCI), and the charge current II" (correspondingly, the charge current II" A charging current IP of the steady light component (hereinafter referred to as II") is generated to distinguish it from the current IP flowing to the steady light component. Among these, the charging current IP of the steady light component flows through the collector of the transistor (Tr3) and corresponds to the reflected light. The current 11”-IP flows through the transistor (T
r4) flows as the base current. At this time, the reflected light from the subject is transferred to the photodetector (SP) from the photodetector (C4).
The capacitance of the transistor (Tr4) is determined so that the transistor (Tr4) does not respond due to the charging current during the input period to CI). Then, this charging current IP' is 1 runnosta (T
r4), and the transistor (Try) (Tr7)
The current flows through the diodes (D 2 ) and (D 3 ). This increases the voltage (VD) for two stages of diodes, and this voltage (VD) is the constant current I3 of the constant current source (I3).
and the reference voltage determined from the resistors (R11) to (R14).
COMP2) to (COMPS). Then, according to No. 15 from the timing circuit ('I''M), comparators (COMr'2) to (COMPS
), the output signal of each D flip 70 tube (D[go[
"1') to (1)l:'I;", i), and the latch signal is output to the selector. After distance measurement is performed as described above, the light receiving element (SP
The filter in front of CI) is switched from an i filter to a visibility filter to pass infrared light of a specific wavelength. moreover,
With the constant current source (11) turned off, the steady charging capacitor (
C4) Eliminate the voltage of 11 times the constant current for the photoelectric voltage, and also make the constant voltage! The source (■2) is set to O[' F, the feedback path of the 1 runnostar ('rr3) by this constant current I2 is turned off, and the voltage of the capacitor (C4) is changed from the light receiving element (Sl') CI) to the steady current flowing. Make sure that only the voltage depends on the brightness of the light. This voltage is then output to the analog switch (ANSW) via the buffer (13uF1). Ike's photometric circuits (LM2) to (LM9) shown in FIG. 6 have exactly the same configuration as that shown in FIG. Next, an electronic flash for photography 1Il (F
LI) and rangefinding flash (F L 2 )+
1') Illuminate the J+M configuration according to FIG. The electronic flash device for distance measurement (1”L2) has a circuit configuration other than the fact that the 1L of light emitted is very small (approximately 1725 compared to 2 large flash units) compared to the electronic flash device for photography (FLI). Since it is exactly the same as an electronic flash device (FLI) for photography, the circuit is simply a professional gamma
The explanation of the simple structure will be omitted. In the circuit of an electronic flash device (FLI) for photography, (D
CC) is a boost control circuit, which receives boost control from the microcomputer (8 ICs) (No. 3 (FLCl)) and charge completion (No. 3 (FLCl), which will be described later).
B, C1), the external pressure control J11 trannosta (Tr
8) to control the boost operation of the boost circuit ('DC). (DC) is a booster circuit, (D4) is a rectifier diode, (B, C) is a main capacitor (C5
) is a charge detection circuit that detects the charge state of the battery, and (EC) is a light emission control circuit that causes the cannon tube (Xe) to emit light in response to the light emission signal (xl) from the exposure control circuit (AE), causing interrogation light emission. . In addition, the light emitting unit No. 45 (X2) of the electrical flash device for distance measurement (FL2) is equipped with a buffer (Bu
F10). To explain the operation of the electronic flash device for photography (1'L1), when the main capacitor (C5) is fully charged and there is no C, the charging completion signal (n, ci) is [■-]. In this state, the microcomputer (MC) sends a message indicating the start of boosting.
When the boost signal 1r'l all 4ff (FLCI) of "L" is sent, the NOR circuit (NORI)
When No. 3 is output and this is input to the step-up control circuit (DCC), the step-up control circuit (DCC) outputs the transistor (Tr).
8) is controlled to turn ON, and the external pressure operation of the booster circuit 113 (DC) is started. And the main capacitor (C5
) is fully charged and the fully charged Igo (B-CI) is displayed as “■
1", or the boost control signal (FLCI) from the microcomputer CMC) becomes [! ]”, the Noah circuit (NO
R1) outputs rLJ, which causes the boost control circuit (
DCC> controls to turn off the transistor (Tr8) and stop the external pressure. In addition, the main capacitor (C5)
When charging is completed, the neon tube will indicate this status.
It is turned on independently of the boost control circuit (DCC) and microcomputer (MC). Next, the overall flow of the camera in the example will be explained.
The 11τf is used for distance measurement in an actual example! The number of distance zones for detecting whether the subject is in the distance zone at position A, the focusing distance range in each zone, and the determining power thereof will be explained. As described above, the distance measuring device of the embodiment detects the distance based on the absolute amount of reflected light from the subject. However, since the reflectance differs depending on the subject, the distance detected by the distance measuring device and the distance of the subject do not necessarily match. In this embodiment, in order to ensure that the subject is in focus even in the case of 2, the focusing pressure gI range of each distance zone is widened (or the focusing distance that spans the two distance zones However, with this method, the distance range from the closest distance (for example, 0.6 m) to infinity with the aperture of the photographing lens open (F3 in the example) .5) c It is impossible to always maintain focus on one subject using only five distance zone regions. Therefore, in this example, Ct is By using a photographic lens, I limit the maximum aperture to a small aperture to widen the focusing range for a specific area, so that I can always get sharp focus only in the five distance zones. As a result, the smaller the aperture of a shutter that can also be used for fringing, the faster the shutter speed becomes, which has the disadvantage of narrowing the brightness range in which natural light photography without illuminating the subject with an electronic flash device tends to result in underexposure. In this embodiment, in such a case, an electronic flash device is used to provide a flash Q.
;j e There are 4 guns, and I'm using 1 to compensate for this. In addition, the shank for the lens used in this example is as follows:
This type shows a diagonal waveform in the interdimensional change characteristics of the degree of opening.
The aperture gradually opens in response to the series and reaches a predetermined aperture value.
When it is turned on, it shifts to a closing operation. Based on the above-mentioned idea, the five distance zone areas, the focusing area in each distance zone area, the maximum aperture I) value of the use limit at that time, and the flash photography IL7
The aperture value is shown and clarified in FIG. In the figure, the vertical pongee indicates the distance zone 1 area, and the distance zone areas 1, 2, 3, 4, and 5 are arranged in order from the short distance side. !
The yellow line indicates the distance to the subject, and indicates the range from 0.6 wheels to force. Explanation of the focusing distance range of each distance zone area-r
Then, in region 1, the open aperture value is F8, the focal position of the lens is 0.75, and the focusing distance range is 0.56111.
~1.1μ. In area 2, the maximum aperture value is set to 5.
6. Jiao, 1. ″, (position 1.0 transposition focal length 1iIII
The area is 0.77111-1 and 5m, and in area 3! 1
11 Friction value is F4, focal position is 1.5 mm, focus x11
The separation range is set to 1.1 m/-2.2 m, the open aperture value is set to F3.5 of the photographing lens in the range 4.5, and People have decided that the distance of the glans is 1ilH, the glans is 1.5m-3.6UA, the focal position is 51mm in area 5, and the focusing distance is 2.71-■.In Figure 9, FM is an electronic flash device. This shows the aperture value for flash photography using the following.Next, we will explain how to determine the aperture for flash photography when designed in this way.Now, the amount of light emitted at the flash Vc position is set to film sensitivity 100. On the other hand, assume that the ID number is 10. Then, in area 1, F13 is set, and at the short distance end (distance to the subject is 0.56 m), the exposure value Ev is 1 stop over, and the long distance fi (distance to the subject is 1.1ts), it is designed so that the exposure value of 1mmV is one step under.Hereafter, areas 2 and 3.4
．． In the same way for 5, determine the aperture value so that the close and far ends of the focusing distance range for each area are over or under by the same exposure value, and 5, the maximum aperture value is set to F3.5 so that the flash light can reach as far as possible to enable flash photography. In FIG. 9, FNl is determined in this manner for each type of flash photography! It shows the F number (F number) in the a1 column. A chart 70 showing the operation of the microcomputer (MC) is shown in Figure 1 (Figure 1), and the control operation of the camera will be explained with reference to this chart. First, let's look at the operation when electric M(E) is installed on fjS10.
This will be explained using figures. When the battery (E) is installed, the reset terminal of the microcomputer (MC) - (RES)l2rLJ
(G) %1 is manually operated, and the microcomputer (HTC) is installed with batteries (70 from step well ())
- Execute. , 2-70-, first, in step #5, the microcomputer (MC
) disables all interrupts to this 70-, and steps #1
0 to initialize the output terminal of the microcomputer (MC) and Renostar. Next, in step #15, set the terminal - (II"'6)
Manually enter the lens (j) to allow i ■ insertion, and in step #20 determine whether the lens cover is opened or not from whether the lens cover switch (SO) is turned on or not, and open the lens cover. If so, proceed to step #25 and disable interrupts to the interrupt terminal (■NT1>, which will be described later), and stop at step #2. If the lens cover switch (SO) is ON (J'z), proceed from step #30 to step #45, which will be described later. The interrupt routine (lNTO) will be explained below.When the lens cover is released or a1 is set while the interrupt force of 70-... is enabled, the interrupt end T- of the microcomputer (MC) is activated. (I
A pulse signal is input to NTo), and the microcomputer (MC) starts the interrupt routine (INTO) from step #32!
f! First, in step #35, it is determined whether the lens cover is opened or closed based on the state of the lens cover switch (SO), and if the lens cover is closed (lens cover switch (SO) is 0FF), go to step #57 and execute the interrupt routine (
Disable the interrupt to 70- of TNT1) and proceed to step #60. If the switch (SO) is turned on in step #35 and the lens cover is released, the step Microcomputer (MC) with 7p #40
Enables an interrupt to the interrupt terminal (INTI) of 31, and starts boosting the electronic flash device (I"Ll) (Pl2) for distance measurement for photography in steps #451 and #50. ) output terminal (FLCI) (FLC2) to [H
J (No. 4) is output, and in step #55, the main capacitor (C5) of the electronic flash device (FLI) for photographing is output.
Input the charging completion signal ([3, CI) to check whether charging is completed and t'! Set. In addition, when the battery is installed and the lens cover is left unused, proceed to step I5. In step #55, it is determined that charging of the main capacitor (C5) is completed. And step #60. #65 has an electronic flash device for both photography and distance measurement! 1 (F L 1 ) (Pl2), the microcomputer (MC) sets the output terminal (FLC1) (F
The rLJ signal is output to LC2). Then, in step #70, set all 7 lugs of the microcomputer (MC) and set the steno? #75t'f Mugijo r Ruko 11 included t
The timer that was counting time is stopped at step #80, the display is turned off at step #80, and the operation is stopped at step #85. Next, when the lens cover is opened and the release button is pressed down to the first stroke, the microcomputer (MC)'s old terminal 11NTI inputs a number 0 that changes from "I1" to "L". Then, the microcomputer (MC) performs step 70- of the i separate sending routine (INTI) from step 90 in FIG.
Execute. In this flow, first, in step #95, an electronic flash device (FL) for shooting 7p is used to perform distance detection and brightness detection.
I) Stops boosting of voltage to prevent noise caused by voltage increase and boosting of battery voltage. In step #100, turn on the trannostar (Tri) to supply power to each control circuit, etc., and turn on the analog switch (ASI) in step #105.
) (AS2) and turn on the constant current source (11) (
I2) respectively, and in step #110, turn on the terminal (opi) to switch the filter to infrared for distance measurement.
) to [llJ. Then, in step #115, a timer for circuit stabilization is reset and started, and in step #120, a timing capacitor (C3) for increasing the timing at which the output of the distance measurement/photometering circuit is latched is discharged. Turn on the trannostar (Tr2). Next, in step #125, an electronic flash device (Pl) for distance measurement is
In order to start boosting the voltage in step 2), the voltage is controlled to 1, and in step #130, it waits for the charging of the light emitting capacitor to be completed. When this charging is completed, this boosting is stopped in step #132. Then, in step #135, it is determined whether 20 msec has passed kX since the start of the above-mentioned timer, and if it has not exceeded I1, wait for it to elapse, and if it has passed, step #1
At 40, set the timing transistor (Tr2) to Or
'Set it to F. Then, in step #145, in order to detect the distance to the subject, [I(] is output to the terminal (I2) to cause the electronic flash device (Pl2) for distance measurement to emit light, and in step #
At step 150, whether or not the distance measurement data is latched is detected by inputting the G signal from the timing circuit, and the distance measurement data is latched. When it is detected in step #150 that the distance measurement data has been latched, the process proceeds to step #155 and the microcomputer (Me) terminal (OP1) is used for brightness detection.
) to rLJ, set the filter to visibility, and turn off the analog switch (ASI) (AS2) at step well 160.
"AF data" which captures the latched data for distance measurement in preparation for brightness detection at step #165.
Proceed to subroutine. The details of this rAF data subroutine will be explained with reference to FIG. 12. First, step #l (100-#1
At 010, the microcomputer (MC) sets the variables (N) (Nl) (N2
) to O, and in step #1015 set the variable (
Set DO) to 5. And step @102
0, this set variable (N) is outputted to the decoder (D E 2 ) shown in the 6th and 1st, and the process proceeds to step 102'.
, + receives the output of the decoder (DC2) from the selector (
The output data (Dl) of the encoder (CD) which encodes the distance measurement data from the distance measurement/1llll optical circuit selected by SEL) into a predetermined hood is input. This data (Dl) is a value corresponding to the distance zone areas 1 to 5 (for example, if the distance zone fII'I area is 1, the data ([) 1) is 1, and if the distance zone area is 5, the value is 1.
The data (Dl) is also 5). The second microcontroller (MC is input to the rcoder (I)
1), in the next step 70-, each light receiving element (Sr
Distance measurement based on the output of "CI) ~ (S2O2) 111
It is determined by flI which distance zone heading each of the distance measurement data directly inputted by the 1I error circuits (LMI) to (LM9) indicates. First, in step #1030, it is determined that the variable (1')0) set to 5 in step 1015 to correspond to the distance zone 4 area 5 indicating the farthest distance and the human power data (Dl) are equal to each other. and if they are equal, add 1 to the variable (N1) in step #1 (135).
This is a variable for determining tq the number of flowering/1il11 optical circuits that have detected that there is a subject in a5. Then, in the step well 1040, input data (D
l), and in step 91045, 1 is added to the variable (N) (N = 2). − force, variable (D(1)
If and the person J data (Dl) are not equal, 5 proceeds to step 1 $ l ()5 f) and input data (Dl/I
C Variable rjL (D
N1 determines whether or not the Wl'i distance zone area is closer than O
DI), proceed to step #1045, and when indicating a closer distance zone area (DO>Di), proceed to step #1055! : t t ntl” 'IZ number (N
1) Set the IC, and further set the variable (N2) to variable (N) in step #1060 (N2=0), and proceed to step #1040. This is weird! &(N 2 ) indicates each number of the lli separation. In step #1045, the variable (N)
After adding 1 to (N = 2) l2 is the step $1
At 065, it is determined whether this variable (N) has become 9 or not, that is, whether all force and distance measurement data corresponding to the outputs of the nine light receiving elements (SPCl) to (S2O2) have been inputted,
If not, return to step #1020 and repeat this loop, then press N at Ste Knob #1065.
= 9 and finish inputting the distance measurement data, step 1
Proceeding to step 1067, the process returns to 70-, the source of step #165 in FIG. 11, and proceeds to the next "JIIl likelihood data" subroutine. The second "photometric data" subroutine is shown from step #1070 in FIG.
(N 1 ) is 1, that is, out of the nine measurement areas ■ to ■, the number of measurement areas determined to be in distance zone area 1 corresponding to the closest distance is singular. If it is singular (N 1 = + 1, proceed to the 1 spot photometry subroutine of step #1075.Measurement area where it is determined that the subject exists in the distance zone IJ Kai 1 corresponding to the nearest distance) When the number of is a number (Nl≠1), proceed from step #1070 to step #1080, and check whether the variable (N2) is 0 or not t!!
and determine whether the corresponding measurement area ■ is included in the central part of the middle-second imaging range of the plurality of measurement areas, and if this area ■ is included (, N 2 = O ) also go to Step 7 #10751. Ichiriki, the measurement area in the center is not included N2
≠0), the average photometry 7 lag (AV
RF), then proceed to the "average photometry" subroutine in step #1090, and use the average photometry value (113V 2 ), which will be described later in step 5, as photometry data (BV), and set the average photometry value (113V 2 ), which will be described later, in step #1100 to 70 - Return to. The "spot photometry" and "average photometry" subroutines in this "photometry data" subroutine will be explained with reference to FIG. First, to explain the "spot photometry" subroutine, in step 11GO, the microcomputer (MC)
) is any 3 of the nine III constant fl Ja■～■
A variable (N2) indicating the number is output to the decoder (D E 2 ). Then, the Tekog (DC2) decodes this and sends it to the rangefinding/photometering circuit indicated by '& number (N2), and sends Ana 0713, which indicates the detected subject brightness, to the A/D conversion circuit (A/D ) to output to the analog switch (A
NSW) to turn on one of the nine ETs. Then, in step $1165, the microcomputer (MC) outputs an A/D conversion start signal from terminal - (011G) in order to convert this analog signal into a digital signal, and in step #1170, this A/D conversion is completed. Whether this is the case is determined by the signal at the terminal (OP7). Furthermore, A
/ D￥: When the A/D conversion operation by the converter circuit (Δ/D) is completed, the microcomputer (MC) outputs the A/DP-child signal from the terminal - (OP6) at step #1175, and returns to step # The photometric data indicating the subject brightness converted into a dinotal signal at 1180 is taken in as photometric data ([3V). Next, when explaining the subroutine of "average photometry", first,
In steps #1105 and #1110, the r variable (BV2) indicating the average photometric value and the variable (1) indicating the number of one of the nine ranging/photometering circuits are set to O, and in step $1115, this variable Defog (1) (DC2)
Output to. As in the case of spot photometry described above, in steps #1120 to #1130, analog No. 13 indicating the subject brightness detected by the ranging/photometering circuit corresponding to this variable (I) is converted to A/l). Circuit (A/D
), and in step 61135, the second photometric data is input to the microcomputer (MC) as photometric data (nVl). Furthermore, step $ 1 ], step # in i 0
Add this photometric data (13V1) to the variable (T3V2) set to 0 in step #114', )
Add 1 to variable (1). And step #l 1
5. Then, determine whether the variable (I) has become 9. If it is 9, it indicates the subject brightness from all 9 distance measurement/photometering circuits (LMI) to (LM9), and the photometry data has been input. Then, proceed to the next step #1155, and if 91 is completed (then return to step #1115, repeat this loop, and input photometric data. When all the data are manually input, the microcomputer (MC) , in step #1155, each ranging/photometering circuit (LMI) to (LM'l
), the photometric data (B~'2) obtained by adding up all the data corresponding to the subject brightnesses measured respectively is divided by 9 to obtain the average brightness data (BV2) of the subject. Here, as a modification of this example, when there are multiple light-receiving elements used for distance measurement, the photometric value averaged over the entire area may always be used, regardless of the light-receiving element that focuses on the area from the center. Okay, to do this, just delete step #1080 in the 70-chart of FIG. 12. When the "photometric data" subroutine in Figure 12 is completed,
Microcomputer (MC) Nori 1 work returns to the 70-chart in Figure 11. In step #175 of FIG. 11, film sensitivity data is read from the film sensitivity setting path (IS) at a 7 venox value (S V ), and in step #180, the above photometric data (BV) is added to this value (SV). In addition, the exposure value (EV) is determined. Next, an explanation will be given of the exposure value (EV) for switching between natural light photography and flashlight photography, which changes depending on the determined distance zone region when a subject is present. Step #1
In 85, add 111 whether the area where the subject exists is the distance zone area 1 corresponding to the nearest 10 distances or the distance,
If it is zone 1, the process proceeds to step knob #190, and i1 determines whether the exposure value (EV) calculated in step #180 is 13.5 or more. And exposure value (EV) force bow 3.
If it is less than 5, the exposure value (EV) is fixed at 13.5 in step #235 and the process proceeds to step #270.Similarly, in step #195, if a subject exists, the exposure value (EV) is set to 13.5.
It is determined whether or not the specified area is distance zone area 2. If it is zone 2, the process proceeds to step #200 and the exposure value (E
It is determined whether V) is 11.5 or more or apricot. When the exposure value (EV) is less than 11.5, the process proceeds to step #230 and the exposure value (EV) is fixed at 11.5. Furthermore, in the step well 205, it is determined whether or not the area where the subject is determined to be present is in the distance zone area 3, and if it is the zone 3, the step well 2101 is rubbed to determine whether the exposure (direction (EV) is 9.5 or more). If the exposure value (EV) is less than 9.5, the process proceeds to step #225 and the exposure value (EV) is fixed at 9.5. 1. If the determined area is distance zone area 4 or 5, the process proceeds to step #215 from step 3205, and the exposure value ([■) is 8.
．． It is determined whether tq is 5 or more. Then, the exposure value (EV
) is less than 8.5, the exposure value is fixed at 8.5 in step #22(). These steps #220. #
22S, #230 and #235 each proceed to step #270 and enter a flash photography mode in which the electronic flash device 7i (F L 1 ) illuminates the subject and performs ilz. In February, the distance zone area where the subject exists is sea/territory! &l, the exposure value (EV) is 1:35 or more, when the distance zone area is 2, the exposure value (EV) is 11.5 or more, and when the distance zone area is 3, the exposure value (EV) is 9.5 or more. , the exposure value (E
If V) is 8.5 or higher, step #24 respectively.
0, and it is determined by 1゛q whether the average photometry 7 lag (AVI(F)) is set.Here, if this average photometry flag (AVRF) is not set, the process proceeds to step l$245. The "average photometry" subroutine shown in Figure 13 is added with ¥: and the photometry data of average photometry (DV2)
is determined, and in step #250, the above photometric data (B V
2) and the photometric data (DV) of spot photometry, and use this difference as the photometric difference data (DV3) (nV3=
nV2-+3V), and furthermore, the photometric difference data ([1V3) of I'm sure it's more or less than that. Then, this photometric difference data ([3V
If 3) is 2EV or more, it is assumed that the average photometric value and the Spon F photometric value are in a state where the brightness is in the opposite direction, and the in-mouth synchronization flag (FILE") is set at step #260. Proceed to $270 and enter the flash m shadow mode.
RF) is set, or step #2
At 55, the photometric difference data (+'3 V 3 ) is 2E
less than V, and the brightness value of average photometry and ll1 of spot photometry
If the difference from the degree value is 2EV terminal vortex, step #26Sl
Proceed to step #390, which will be described later, and set the threshold value (AV
) and then release 70--N. Next, following the explanation of the flash photography mode from step #270, in step $270, the electronic flash for photography i?
! Determine tq whether charging of the main capacitor (FL 1) is completed, and if it is completed, proceed to step #310.
Proceed to , and display that shooting preparations are complete. If the main capacitor of the electronic flash device (FLI) for photography has not been fully charged in step #270, the release button is pressed down to the first stroke and the photography preparation switch (Sl) is turned on in step #275. If this switch (Sl) is ON, it is displayed in step #280 that charging of the electronic flash device (FLI) is not completed, and the release button is released and shooting a is started. Wait for the preparation switch (Sl) to be OFI'. Then, when the release button is no longer pressed all the way to O-R and the JA shadow preparation slider (Sl) is turned off,
At step #285, the microcontroller (MC)
"I"+・l) is turned off and the supply to the control circuit, etc.
However, in step #290, the electronic flash device for photography (F
Start external pressure of LI). And step well 295t
'Reset the timer for pantelicche and star F, step #300 and #305, step #
2ρ Determine whether charging of the main capacitor is completed within 10 seconds from 5, and if charging is not completed within 10 seconds, the power supply is exhausted, so step well 320
Proceed to stop external pressure. And step #325
, reset and start the warning display timer, give a battery check warning for 5 seconds in steps 33() and 335, turn off all the displays in step #340, and turn off the display in step #345. 7. Reset the lag and stop the operation in step #350. If charging of the main capacitor is completed within 10 seconds from step #295, the power supply is not depleted, so proceed to step #310 from step #30 <1 to display the completion of shooting preparation, and then Proceed to step #355 in Fig. 14. In step #355 in Fig. 14, the flash photography mode - diaphragm 1) hani (AVI) is performed based on the following formula.AVI"2.5+DV+ (SV 5) Here, DV is VC7i: Distance zone area 1 where the body is determined to exist.
, 2, 3, 4, 5, the value is 5, 4° 3.2.1 6 For example, the amount of light emitted by an electronic flash device (FLI) is always constant, Assume that the id number is 10 for l5O=tOO. In this case,
The area where tq is determined when the subject exists is the distance zone area 2, and the film sensitivity of the film used is I 5
O=100. ! 3, DV, 5Vli each f14
．． 5, the calculated aperture value (AVI) is 6.5, and when converted to an F number, it becomes F/9.3. Next, proceeding to step #357, it is determined whether the calculated aperture value (AVI) is less than 3.5.
If it is less than 3.5, it is fixed at 3.5 in step #360 and the process proceeds to step #362. Then, in step #362, the mouth synchronization flag (F
If this flag is not set and it is not the mouth synchronization mode, it is determined whether or not the mouth synchronization mode is set by tq determining whether the flag ILE) is set or not.
F=0), the exposure value (EV) fixed for each zone in step #365 is controlled based on the following formula! ! y
The fringe value (Δ■) for (1;

[Calculate, step #38
5 outputs the aperture value (AVI) data indicating the light emission timing of the flash light emitting device 5 (1.'' [-1). AV = 3.5 + (CV 8.5) / 2 steps, step #3
If the mouth synchronization flag (FILF) is set to 1 in step 62 and the mouth synchronization mode is in effect, step l$
3701, the aperture value (A”
l/2). AV2=3.5+[(13V2+5V)-8,51/2
Then, in step #375, the aperture value (A V 2 ) calculated in addition to this is compared with the aperture value (AVI) of the above-mentioned flash @ shadow mode. This is an electronic flash device (FLl) during the daytime mode. This determines whether the amount of light emitted by the camera will provide the appropriate exposure for the main subject. To be more specific, daytime sync photography generally exposes the background based on natural light, and exposes the subject using electronic flash!
The lighting is adjusted depending on the location of the camera to compensate for the lack of natural light exposure. Therefore, when determining the aperture value in natural light shooting mode and using an electronic flash device with a constant amount of light emitted using that aperture value, it is difficult to determine whether exposure 1 for the main subject at a predetermined distance is appropriate using the flash light. The aperture value (AVI) calculated in flash photography mode and the above natural light J
It is sufficient to compare the aperture values (AV) calculated in the Q shadow mode. With the aperture-cum-shutter, the aperture gradually increases from a small aperture to 11, and flash photography can be performed at any time during the darkness. AV1≧AV), and if there is a timing when the electronic flash device (F L 1 ) emits light, it can be said that the exposure amount of the main subject will be appropriate with the flash light. In other words, the performance T1. When the aperture value (AVI) calculated is equal to or greater than the aperture value (AV) calculated in the natural light photography mode (same or small aperture), proper 1] medium synchronized shadows can be performed. In such mouth synchronization mode, step #380
The microcomputer (MC) uses the aperture value (AV2) in average photometry as the control aperture value (AV), and uses the above aperture value (AV2) as the flash emission timing data in step #385.
Output the data of I). Furthermore, in this embodiment, when the main subject does not have an appropriate exposure amount due to flash photography even in a backlit condition; this step starts from step #375. 1$ 38 +1, and control aperture ft1 (AV) using the following formula based on the photometric data in spot photometry.
Photography using natural light. AV=3.5+(EV-8,5)/2 Furthermore, in step #390, the microcomputer (MC) determines whether the release switch (S2) is turned on by the release operation, that is, by pressing the release button up to the second stroke. Add ↑1 to ``No'', and if no release operation is being performed, proceed to step #3951 and press the shooting preparation switch (
It is determined whether the release button has been pressed down to the first step by determining whether or not the release button (Sl) has been turned on. If it has been pressed down, the process returns to step #390 and the release is activated (
If the release button has not been pressed down to the first stroke in step #395 (switch (Sl) is OFF), wait for step #1; to be performed, step #4 described below
Go to 50. When it is determined that a release forgery is being performed at Stenbui 3901, the microcomputer (MC) enters the release control function, and first, in step #392, this 70
-, and in step #400, distance measurement data (
AF data) is sent to the AF control circuit (AFC), and in step #405, a start signal to start driving the photographing lens is output to the AEF control circuit (AFC). When the photographic lens is driven to a predetermined position based on the above data, A
The switch (S 5') indicating the completion of F control is turned on, and as a result, step #41 (+ is used to switch the microcomputer (M
C) detects completion of AF control. Then step #
At step #415, the microcomputer (MC) outputs data on the control aperture value (AV) to the exposure control circuit (AE), and in step #4
At 20, an AE control start signal is output to the exposure control circuit (AE). In the exposure control circuit (AE), a microcomputer (M'
When flash emission timing data for flash photography is sent from C), electronic flash 5! for photography is sent at a predetermined timing based on that data. Emit light at position c (['L1) and output No. I (Xl). Exposure control circuit ()\E)lThus, when exposure control is performed and the switch (N3) indicating exposure completion is turned on, it is detected in step #t25 and step #t301 is performed.
: r-F h, step L430 Te'e -5'
(M) to wind the film one frame,
When it is detected in step #435 that the film has been wound by one frame, the motor (M) is stopped in step #4. Then, in step #445, the microcomputer (MC)
0- is allowed, and the power supply to the control circuit is set to OF I" in step #t50. Then, in preparation for the next operation, the power supply for photographing and The external pressure of the distance measuring electronic flash device (FLI) ([' L 2 ) is started, the boost control timer is reset and started in step #470, and steps #472 and #475 are started.
If charging of the main capacitor is completed within 5 seconds or 5 seconds have passed, steps #480 and #485 are completed.
Stop the external pressure of each electronic flash device (FLI) (FL2) with step #490, turn on the display i) Y, reset all 7 lags with step #495, and step #5
At 00, the microcomputer (MC) stops its operation. The first embodiment based on the present invention has been described above, but in the above embodiment, z[i
It was set as a separate zone area. But next: This ill'! 2
In this example, when determining the distance zone area in which it is determined that the subject exists, we add the values found for each distance zone area without weighting each distance measurement/photometer circuit, and determine the distance. Detect which zone areas exhibit the highest frequency. If there is one interval between this detected distance zone area and the closest distance zone area among the detected IO#1 zone areas, the subject is present in the intermediate distance zone area. If it is, it will be cut off. For example, if distance zone area 3 is detected as the most frequent distance zone head, and W1i distance zone area 1 is detected as the closest distance zone area, distance zone area 1 and distance zone 11'I area The intermediate distance zone area 2 between the distance zone 3 and the distance zone 2 is defined as the distance zone for photographing. On the other hand, when the distance is other than the above, the closest distance zone head is set as the distance zone for photographing. Brightness detection and backlight detection are the same as in the first embodiment. 15 and 16 show 70-charts of the operation of the microcomputer (MC) that executes this second embodiment. This flowchart is based on the step well 165 shown in FIG.
and #170 "＼F data" subroutine and "photometric data" subroutine modification examples, and the overall flow is the same as in FIGS. 11, 13, and 1. Hereinafter, the flowchart To explain this, in FIG. 15, the microcomputer (MC) first performs steps #1500 to $1.
510, variables (N O) ~ (N4) (NIO) ~ (N
14) and (N) are respectively set to (). and,
In step #1515, the microcomputer (MC) outputs the set variable (N) to the decoder (D E 2 ), and in step #1520, the distance measurement data (
Dl) is input to the microcomputer (to 4C). Here, each of the ranging/photometering circuits (LMI) to (LM9) is group 1 consisting of ranging/photometering circuits (LMI), group 1 consisting of ranging/photometering circuits (LM2) to (LM5), or C], respectively. group 2
, and ranging/photometering circuits (LMG) to (LM9). ing. Here, each ranging/photometering circuit (LMI) ~
(L M 9 ) are the light receiving probes (Sr”CI) to (SPC
9) respectively. Therefore, the maximum weighting is 3 for the measurement area ■, the weighting 2 for the measurement areas ■~■, and the weighting 1 for the a11 fl area ■~■. being done. To explain this weighting, if the measurement area is ■(N
= O), from step l$1525 to step #1
After completing step 530, set this person category (Dl) to a variable (D
2), and in step #l535 weighting data a
Let be 3. Same (, if measured at p and the n range is from ■ to ■,
Proceeding from step #1540 to #15/t5, weighting data a is set to 2, and if the measurement area is ■~■, step #1540 h- et al. Step #1550
Then, the weight block sets data a to 1. Next, the microcomputer (MC) calculates the total number of measurement areas belonging to that distance zone area and the m
Add the found data. The distance zone area detected in the measurement area ■～■ is 1
．． 2, 3, 4. S, each variable (N
O) (N I HN 2 ) (N 3 ) (N 4 )
Add weighting data α to the variables (N 10) (N 1
1)(N12)(N13)(N14)<(#1555 to 11340), and in step #1645, 1 is added to the variable (N), and in step #1650, the number of measurement areas is added. of! : Determine whether the loss (N) has become 9 or not, and if it has not become 9, step #1515
Return to step #1G55 and repeat this loop until the variable (N) becomes 9. If it becomes 9, assume that all the distance measurement data was manually generated, and proceed to step #lG55.
determines the range zone region that contains the most frequent range measurements. First, in step #1655, the value of the variable (NO) indicating the addition value of the weighted data of distance zone head 1 is transferred to N5, and then in step #1060, the distance zone area is set to 1 in variable (D3). Input r data indicating that, and set variable (1) to 1 at step l$1665. Next, a variable (N5) indicating the added value of the weighted data and a variable (N
l) (I is the above variable) For example, if I = 1, the weight corresponding to distance zone area 2 is the variable (N5) indicating the added value of the data and the variable (N1) are compared), the variable If variable (NI) is greater than (N5), step # I G 751: ttn r variable (N 5 )
value is changed to the variable □JI), and at step $1680, the current distance zone i;f'laI is input into (D3). In step #1670, the variable (Nl) is changed to the variable (N5
) At the following times, proceed to the next step #1685 and add 1 to the variable (I), and in step #1690 determine whether this variable (1) has become 5, and if it has not become 5, Return to step #1670. If the variable (I) becomes 5 in step #1090, the microcomputer (MC) then returns to step #1695 in FIG.
Indicates the closest distance among the detected distance zone areas. The distance zone area and the distance between this distance zone area and the distance zone area of the mode are determined, and the distance zone head position for photographing is determined. Step #I in Figure 16 G95, $$1710, $1
725 and 17401, the microcomputer (MC) sequentially inspects the distance zone area from 1 to t,
m Indicates the value of the found data 1゛variable (N O) (N 1
) (N 2 ) (N 3 ) is no longer 21'E g! Zozo Ode Request, Step #17
00, #1715, #173 o or l$ 17
45, the variables (N O) (N 1 ) (N 2 ) (N
B, 7, +° where any of 3> is no longer ()
, 1. The data indicating the distance zone area in the variable (D(1
), and further step #1705, #l72
0, #] 735 or #1750, the variable (N10) (Nil) (
Input either of N12) (N13) to variable (N7)
Ru. Then, in the case of a distance zone area force q~3 indicating the closest distance among the detected distance zone areas, the variable (DO
) indicates either zone 1.2.3. In this case, in step #1765, it is determined whether the interval between the distance zone area indicating change (D O) and the variable (D3) indicating the distance zone area of the mode is 1. If this interval is 1, then step #177 I
) and set the data of the IUH zone area in the middle to variable (1).
O) and proceed to step $1775 of the "Photometric Data" subroutine. If the distance zone area of the closest distance detected is 4 or 5, then the distance zone area of the mode is also 4 or 5, so the interval between the two will never be 1.
In step #1745 or #1755, enter the data indicating the zone area into a variable (DO), and step #1
750 or 'Ip 17 G O indicates the number of measured cn areas in the distance zone area Jr'& number (N l 3 > (
N14) When the noise deviation is input as a variable (N7)-\, the process immediately proceeds to step I$1775. The "photometric data" subroutine starting from step #1775 is different from that shown in FIG.
75, step #1070 of FIG.
Rr! L(N 1 ) 7! l' (N 7 )
In the Tata IT, the contents processed by the microcomputer (MC) are the same. Examples can also be considered. (1) In both the eleventh and second embodiments, when there are a plurality of measurement areas where the distance zone area that marks the closest distance among the detected distance zone areas is detected, For the photometry data when measurement area ■ is not included, the average of all measurement areas is calculated regardless of the distance zone area. It is also possible to take the average of the brightness detected by the measurement area.To do this, the number of the measurement area where the distance zone area indicating the closest distance was detected is memorized, and based on this number, the til1 degree of the measurement area is calculated. In addition, regardless of the central measurement area ■, if the measurement area that indicates the closest distance and detects the 1 distance zone fKI area is the current number, then these multiple It is also possible to take the V average value of the photometric values of the measurement area. (2) In the first and V second embodiments of the present invention, the distance measuring light projection r/stage is provided separately from the electronic beveling device for photographing. I used an electronic flash device, but it is also possible to use the electronic flash device for photography at the same time.In this JIJ case, when measuring distance, a filter is installed on the entire surface of the light emitting part to transmit only specific infrared light. It is sufficient to provide a mechanical mechanism for retracting this filter during photographing.Also, the one-stage light emitting r mentioned above can be used in accordance with the special specification 1; 1987-14 G 0
It may be a plurality of light emitting diodes (LEDs) as shown in Publication No. 32 (1), or it may be one in which one light emitting diode is sequentially scanned. (3) When a backlight condition is detected, in the above embodiment, if the exposure amount of the main subject is not appropriate with only flash photography, the flash photography mode is switched to natural light 12+J mode;
Moreover, when it came to natural light shooting mode, I had to switch from average metering to spot metering. However, even if the amount of exposure of the main subject is not necessarily appropriate, film has a latitude range, and as long as it is within that range, the image of the subject can be reproduced. Specifically, when it comes to film, if the exposure value (EV) is about 1.5 stops from the proper exposure value, this is the range that can be covered by the above-mentioned chichede, so it is sufficient to use flash light only. : It is not necessary that the exposure amount of the subject be appropriate, and the subject may be illuminated by the flash light, which results in 1.5 steps underexposure at ff1 (EV). (4) Furthermore, the above-mentioned modification example (
1) to (3) may be appropriately combined. (Leaving space below) As detailed above, the exposure side υji device according to the present invention measures light over a relatively wide area of the shooting range, and measures the entire shooting range.
The first photometric value r,z calculates the first photometric value that is approximately the average of the brightness of the area, and the second photometric value for that area is calculated as 61 (calculated). fjS
2 photometering means and distance measurement-1 to measure the distance to the subject
and a flashlight emitting T that is emitted to perform flash photography.
= stage, the first photometric value and the second photometric value are compared, and when the difference between both photometric values is greater than or equal to a predetermined value, it is determined that the situation is backlit.
A first exposure calculation step that calculates 11 exposure values consisting of a combination of aperture value and exposure time based on the backlight t4 constant f2 and the photometric value of fjSl, and the second photometric value. When performing flash photography using a second exposure calculation means that calculates a second exposure value consisting of a combination of an aperture value and an exposure time based on the first exposure value, and an aperture value determined according to the first exposure value. Then, based on the aperture value, the measured distance to the subject, and the amount of light emitted by the flash T1, it is determined whether or not the amount of exposure to the subject is appropriate based on the amount of light emitted from the flash emitting means alone. Another method and when it is determined that the situation is backlit? If it is determined from the separate means that the exposure amount for the subject is appropriate only by the flash light emitting means, flash photography is performed using the flash light emitting means, and the exposure operation is controlled based on the first exposure value, and the judgment is made. If it is determined by means that the exposure amount to the subject cannot be made appropriate only by the flash light emitting means, 792 is used without flash photography.
and an exposure control means for controlling the exposure operation based on the exposure value of fjS2. (so-called spot photometric value) when the difference exceeds a predetermined value, it is classified as a backlight condition and is determined by the first exposure value calculated based on the first photometric value (average photometric value). When performing flash photography using the aperture value, it is determined in advance whether or not the appropriate exposure amount can be obtained using only the amount of flash light emitted, and if the situation is backlit, the flI
When performing mouth synchronization photography, if the first exposure value provides an appropriate exposure for the subject, flash photography is performed based on this first exposure value, and if the appropriate exposure cannot be obtained, then flash photography is performed. Exposure control is performed by the second exposure value calculated based on the photometric value (spot photometric value) of 112 without firing the flash device, so even when shooting shadows of the subject, It is possible to always obtain the appropriate exposure amount for the subject regardless of the distance.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an example of the distance measurement/photometry optical system used in the embodiment of the present invention, fjS2 diagram is an explanatory diagram showing an example of a liquid crystal filter with variable transmission wavelength, and Fig. 3 is an explanatory diagram showing an example of the distance measurement/photometry optical system used in the embodiment of the present invention. FIG. 4 is a block diagram showing the circuit configuration of the embodiment of the present invention, FIG. 5 is a circuit diagram showing a specific example of the switch group in FIG. 4, and FIG. 6 is the same as FIG. 4. 71111 is a circuit diagram showing a J1 example of the photometry circuit and timing circuit in FIG. 6, and FIG. 8 is an example of the circuit configuration of an electrical flash device. FIG. 9 is a block diagram showing the relationship between the projection distance area, focusing range, and aperture value. FIGS. 10 to 14 are 70-charts showing the operation of the microcomputer in FIG. 4, and FIGS. FIG. 16 is a 70-chart showing a second embodiment of determining a distance area for photographing. (LM) (LMl) to (LM9): first photometric means, ? tS2's yoshiki fs, distance measuring means, (FL) ([''L, 1): flash light emitting means, (MC): backlighting means, first exposure stage T1.F stage, th 2 exposure calculation means, 7 stages of discrimination, (MC) (AE): Exposure control means. Applicant Mi/Ruta Canora Co., Ltd. Figure 1 Figure 3 Figure 72 Figure 6 Figure 3 FL 7 ir Figure 1O Figure 1?Figure 13

Claims (1)

[Scope of Claims] A first photometer that measures light over a relatively wide area of the shooting range and calculates a first photometric value that is approximately an average of the luminance of the entire shooting range; a second photometric means for calculating a second photometric value for the area; a distance measuring means for measuring the distance to the subject; a flash emitting means for emitting light for performing flash photography; a backlight determination means that compares the photometric value with a second photometric value and determines that a backlight condition exists when the difference between the two photometric values is equal to or greater than a predetermined value; a first exposure calculation means that calculates a first exposure value consisting of a combination of; and a second exposure calculation means that calculates a second exposure value consisting of a combination of an aperture value and an exposure time based on the second photometric value. When performing flash photography using an exposure calculation means and a fringe value determined according to the first exposure value, based on the aperture value, the measured distance to the subject, and the amount of light emitted by the flash emission means. a determining means for determining whether or not the amount of exposure to the subject is appropriate based only on the amount of light emitted by the flash emitting means; If it is determined that the amount of light is appropriate, flash photography is performed using the first stage of flash light emission, and the exposure operation is controlled based on the first exposure value, and the determination means determines that the exposure amount for the subject is appropriate using only the flash light emission means. An exposure control device comprising: an exposure control unit that controls the exposure operation based on the second exposure value without performing flash photography if it is determined that the second exposure value does not occur.