JPS59123825A - Flash photographic device - Google Patents

Abstract

PURPOSE:To keep the exposure balance of main and subordinate objects to be photographed, by using a mean photometric output and a partial photometric output for determining a diaphragm and TTL dimming, respectively, irrespective of a set photometric mode, when a flash mode signal is outputted. CONSTITUTION:When a flash mode signal FC is outputted from a flash device FL and a camera is not in an AE-locked state (a switch ALS is opened), mean photometric outputs SPD, SRD are selected irrespective of a photometric mode switching ASS, and basing on a value obtained by adding an output of a constant-voltage source CE2 to said outputs, a diaphragm and an exposure time are controlled. After the exposure control operation is started, the photometric SPD output by the TTL direct photometry is provided to a light emission stop signal output means SG and the flash light emission time is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to the aperture value of a camera and the amount of flash light emitted by a flash device based on the photometric value of a photometer that measures the light intensity of light reflected from a subject that has passed through the aperture aperture of a photographic lens. The present invention relates to a flash photography device configured to automatically control.

Prior Art In a flash photography device as described above, a photometry means is configured to output a photometry value corresponding to the average value of the light intensity of the entire area of the photographing screen, and photography is performed based on the average photometry value from this photometry means. The aperture aperture of the lens is controlled, and the light reflected from the subject that passes through the controlled aperture is measured by this photometer during the flash emission period, and when the integral value reaches a predetermined value, the flash emission operation of the flash light emitting device is stopped. Conventionally, devices have been proposed that are equipped with a light emission stop signal output means for outputting a signal to cause the light emission to stop. In general, if you use flash photography when the brightness of the main subject placed approximately in the center of the shooting screen is lower than the brightness of the sub-subjects in the surrounding area, and the sub-subjects are further away than the main subject, It can be assumed that the subject is exposed by the amount of flash light emitted, and the sub-subject is exposed by the amount of constant light. In this case, assuming that the area of the main subject on the shooting screen is relatively smaller than the area of the sub-subject, the photometric value for controlling the aperture aperture will approximately correspond to the constant light amount of the sub-subject; Proper exposure.

However, since this device controls the amount of flash light emitted based on the average photometric value, the light metering value for controlling the amount of flash light depends on the main subject number, the amount of flash light given, and the steady light amount given to the subject. Therefore, the light emission stop signal output means outputs the light emission stop signal earlier than the point at which the main subject reaches the appropriate exposure level by taking into account the constant light intensity. However, this had the disadvantage that the main subject was underexposed.

The photometry means is configured to output a partial photometry value corresponding to the light intensity of a relatively narrow specific area of the shooting screen, and the main subject is placed in this specific area and the flash is emitted based on the partial photometry value. If a flash photography device is configured to control the amount of light, the main subject can be properly exposed, but this metering method does not take into account the constant amount of light given to the secondary subject, so this device can properly expose the secondary subject. The probability of exposure to light is extremely low, making it impractical.

Purpose The present invention aims to eliminate the drawbacks of the above-mentioned devices and provide a flash photography device that can obtain photographs with well-balanced exposure by setting the main subject to proper exposure and sub-subjects to almost proper exposure. .

Summary The present invention provides a first method that performs exposure calculation based on partial photometry values corresponding to the light intensity of a relatively narrow specific area of the photographic screen.
Excluding the photometry mode and the specific area.

In a camera in which a second photometry mode is manually selected in which exposure is calculated based on a peripheral photometry value corresponding to the light intensity of the entire area of the shooting screen or an average photometry value corresponding to the light intensity of the entire area of the shooting screen, When shooting with natural light, the camera's exposure is controlled based on the metering value of the set metering mode, and when shooting with flash, the aperture of the camera is controlled based on the metering value of the second metering mode, regardless of the set metering mode. In addition, the amount of flash light emitted by the flash light emitting device is controlled based on the photometric value in the first photometric mode.

Embodiment FIG. 1 is a circuit diagram showing the entire flash photography system to which the present invention is applied.

(SPD) is a partial photometry light-receiving element that measures the light intensity of a relatively narrow specific area of the photographic screen, and (SRD) is a light-receiving element that measures the light intensity of the surrounding area of the specific area.

Therefore, when using partial metering, use the analog switch (ASl).
is made non-conductive and only the photodetector (SPD) is connected between the two-power terminals of the operational amplifier (OAt), and during average photometry, the analog switch (As1) is conductive and two terminals are connected between the two-power terminals. Light receiving element (St(1)), (5PD)
or connected in parallel.

Here, the optical arrangement of these two light receiving elements is shown in Figure 2.
An explanation will be given based on FIG.

FIG. 2 shows the arrangement of the photometric optical system of a camera to which the present invention is applied, such as a negative-eye reflex camera, and shows a photographing state in which a film is exposed to light. Figure 2 fal
In , a part of the luminous flux from the subject that has passed through the aperture aperture of the photographic lens CLE) is transmitted to the main mirror, a semi-transparent part or a fine light beam provided on the main mirror (M M ), corresponding to the effective exposure surface of the film (FI). The light passes through the female part of the throat and passes through the optical deflection element (
It is bent downward by the submirror (SM), and is incident on the light receiving element (SPD, 5RD) via the imaging light receiving lens (LS). Note that the aperture value and exposure time are calculated from the received light output at this time.

In addition, the light flux from the remaining subject is transferred to the main mirror (IVIM
) and is reflected by the focusing screen (FS).
The object image is observed through a pentaprism (P P ) and an eyepiece (EP). The optical deflection element (o'ix) is made of a sawtooth-shaped or Fresnel lens-shaped transparent plate, as shown in the enlarged view in FIG.
This is for correcting changes in the photometric sensitivity distribution of the light receiving element due to the presence or absence of the sub-mirror (SM).

In the photographing state, as shown in Figure 2 (bl), the main mirror (M
M) Both sub-mirrors (S, M) are raised and retracted out of the optical path, and the photographing light reflected from the film (FI) hits the light receiving element alone, thereby controlling the amount of flash light emitted by the flash light emitting device. Ru. Incidentally, in the photographing state, the sub-mirror (SM) blocks the light flux that enters the light receiving element from the eyepiece section through the transmission section of the main mirror (MM). The light receiving element is
As shown in the box in Figure 3, the light-receiving part for partial photometry (S P I) which measures the light at approximately the center of the shooting screen and the light-receiving part (S RD ) which measures the surrounding area are integrated into a light-receiving lens (LS).
), and the partial photometry output and ambient light photometry output are independently extracted.

(SE) is a variable voltage source that outputs an analog signal corresponding to the set film sensitivity Sv, and a diode (D
l) is a diode that converts the output current of the photodetector (SRD) and (SPD) into a logarithmically compressed voltage.The circuit section (LS) surrounded by a broken line is the photometry mode setting switch (ASS), which will be described later. and a light receiving element (SRD) corresponding to the signal given from the flashlight emitting device (FL), (
This is a photometric value selection section that selectively outputs photometric values from the SPD. In the circuit section (LS), a variable voltage source (VS
), even if the subject brightness is uniform over the entire shooting screen, the number of light-receiving elements connected to the two terminals of the operational amplifier (OAl) differs between partial and average metering, so the diode (Dl) This is a variable voltage source provided to compensate for the fact that the photocurrents flowing in the OP amplifiers (OAl) are different, and therefore the positive output voltages of the operational amplifiers (OAl) are different. Therefore, in the case of partial metering, analog
Switch (ASi), (As3) non-conducting, (As2)
is conductive, the output of the operational amplifier (OAt) is output as is, and in the case of average photometry, the analog switch (
AS1), conducts (AS3), (As2)
As non-conducting, from the output of the operational amplifier (OAI),
It outputs a potential lowered by the output level of the variable voltage source (VS). In addition, use these variable voltage sources (゛),
After adjusting the partial photometry, the output adjustment for the average photometry may be performed using the variable voltage source (VS). In addition, the light receiving element (
The voltage source (V
The value of S) may be fixedly determined.

The switch (Ass) is a switch that is manually operated to switch between partial photometry and average photometry. During partial photometry, it is connected to the contact (sp) and the inverter (IN2) outputs "L".
An "ow" signal is connected to the contact (AV) during average photometry, and a "High" signal is output from the inverter (IN2).

(FL) is a flashlight emitting device, and its connection terminal (JFI
), (JF2), (JF3), (JF4) are the camera connection terminals (J'BI), (JB2), (J
B3) is connected to (JB4). Connection terminal (JF
I) receives a light emission stop signal sent from the camera's connection terminal (JBl), and this signal activates the flash light emitting device (FL).
) is stopped. The connection terminal (JF2) changes the shooting mode of the camera when the power switch (not shown) of the flashlight emitting device (FL) is closed or when the charging voltage of the main capacitor (not shown) reaches a predetermined value. Connect the signal for switching to flash photography mode to the camera's connection terminal (J
B2. ). This signal is sent as (FC)% to each circuit within the camera.

The connection terminal (JF3) receives a closing signal of the X contact (SX) sent from the connection terminal (JB3) of the camera, and this signal starts the light emission operation of the flash light emitting device (FL). This is a terminal for making the ground potential of the connection terminal (JB4), (J, F4), and the flash light emitting device (FL) common.

The circuit section (SC) surrounded by a broken line is a flash light emitting device (FL).
This is a light emission stop signal output unit that outputs a signal for stopping the light emission operation of the light emitting device. In this circuit section (SC), the transistor (Br3) is a transistor for converting the output voltage of the operational amplifier (OAI) into a logarithmically expanded current G, and the capacitor (C1) is a transistor for converting the output voltage of the operational amplifier (OAI) into a current G.
3) This is a capacitor that integrates the collector current. When the X contact (SX) is closed, the output power of the inverter (INs) becomes ≦11, (igh++, and the flash light emitting device (
A “High” pulse with a time width slightly longer than the time required for the O81
) is output from force). This pulse is an input
From N9 onwards, it is output as a pulse of "I L Ow ++. This causes the transistor (B'T4
') ', (BTJ) becomes non-conductive, the collector current of the transistor (13T2) is integrated by the capacitor (C1), and when the integrated voltage of the capacitor (C1) reaches the output voltage of the constant voltage source (CEI), the comparator ( AC) output becomes 'High h'.As will be explained later,
This collector current corresponds to the output current of the partial photometry photodetector (5PD).

When the output of the comparator (AC) becomes “1 (1gh)”, the output of the one-shot circuit (O5L) becomes °“kl(
iglx”, the output of the AND circuit (ANs) is High.
g h ", and a "High g h" pulse is output from the one-shot circuit (O82). This pulse is connected to the connection terminal (JBI).

(JFl) as a flash light emitting device (
FL), and the flash light emitting device (FL) stops emitting light. Also, the output of the AND circuit (ANs) is “” Hi
By becoming g h '”, a flip-flop (F
F3) is set, and the dimming confirmation display appears on the display (DP).
2) is carried out. The timer circuit (TI) outputs a reset pulse after a certain period of time after the output of the AND circuit (ANg) rises to "High", and this pulse causes the flip-flop (FF3) to be activated via the OR circuit (0λ3). is reset and the dimming confirmation display is displayed for the above-mentioned fixed period of time.Therefore, the one-shot circuit (O5
If a light emission stop signal is output from the comparator (AC) while the "f (high") pulse is being output from 1), the display unit (DP2) will display that the stop signal has been output. , “Hi” from the one-shot circuit (O51)
If the output of the comparator (AC) is not inverted while the pulse of "g h" is being output, that is, the output of the comparator (AC) is
:) is not reversed, the display unit (DP 2 ) will not display the dimming confirmation.

Next, the operating state in each photometry mode will be explained. First, if the flash photography mode signal is not input from the flash device (FL), the signal (FC) is “LOWn i”.
Since the output of the inverter (INs) is "High", the gate of the AND circuit (AN1) is opened, and the gates of the AND circuits (AN2) and (ANa) are closed.

Therefore, the output of the OR circuit (0&t) is the switch (A
"Low" if S S') is connected to the contact (SP) and partial metering mode is selected, "')iii if connected to the contact (AV) and average metering mode is selected.
”. On the other hand, the output terminal (02) of the microcomputer (hereinafter referred to as μ-com) (1), which will be described later, is 'Low++' except during the period of exposure control operation, as will be described later.
Therefore, until exposure control operation A starts, the inverter (IN't&) is "mountain gh" and the AND circuit (AS4) is
The output of the OR circuit (ORI) is output as is.

Therefore, in partial metering mode, the AND circuit (AS4
) output is “'Low”.

The analog switch (As1) becomes non-conductive, and a photometric voltage is output from the operational amplifier (OAt) by partial photometry using only the light receiving element (SPD) as the light receiving section. Here, due to the "Low" output of the AND circuit (AS4), the output of the inverter (INI) becomes "'High'", the analog switch (AS2) becomes conductive, and the signal (
FC) 'Low'
i g h” and analog switch (Ass,)
is conducting. This allows operational amplifiers (OAz)
The output of is directly input to the A-D converter (AD) via analog switches (AS2) and (Ass) and
com(ll). Also, the OR circuit (ORI
), the inverter (IN7')
The output of becomes “High” and the light emitting diode (
SPL) lights up to indicate that the camera is in partial metering mode.

Next, if the average metering mode is selected, the AND circuit (
Since the output of AS4) is “HI g h”, the analog switch (ASI) is conductive and the light receiving element (SP
Average photometry is performed using D) and (SKIJ) as light receiving sections. Here, °' tl of the output of the AND circuit (AS4)
i g h” allows the analog switch (AS 3
) conducts and the analog switch (
Since AS 5) is conducting, the operational amplifier (OAt
The value obtained by subtracting the output of the variable voltage source (VS) from the output of ) is input to the AD converter (AD) as a photometric voltage by average photometry, and is taken into μmcom(ll).

Further, the output of the OR circuit (ORt) is ``High'', causing the light emitting diode (AVL) to light up to indicate that the average light metering mode is set.

The switch (ALS) is a switch that is closed when performing AE flock photography, and this A'E port/tsuk switch (
During the period when ALS ) is closed, the output of the inverter (INI3) becomes 't('high'). This output is passed through the frequency divider (
i) Synchronized with the clock pulse ())P) from V), it is taken into the D flip-flop (DF s ), and the q output of the D flip-flop (DF6) becomes
gh”. These nine outputs are p −COm (11
It is input to the input terminal (12), the inverter (IN4), and the AND circuit (AS3). Furthermore, when this Q output becomes “)4high”, the light emitting diode (ALL)
lights up to indicate that the camera is in AE clock shooting mode.

When the flash photography mode signal is not input in this AE clock mode, a partial photometry or average photometry AE lock photometry operation is performed as in the case of normal natural light photography described above.

Next, if the flash photography mode signal is input and the signal (FC
) is "high", the AE chrome mode is not selected, and the signal (AL) is "L, o w". In this case, the AND circuit (A
The output of S2) becomes “t(high”) and the switch (A
Average photometry is selected regardless of the photometry mode switching state by S S ). Also, the output of the AND circuit (AN?) becomes "High", the analog switch (AS4) becomes conductive, and the signal obtained by adding the output of the constant voltage source (CE2) to the average photometry output is sent to the A-D converter. (AD) is input into μm
com(ll).

Note that the constant voltage source (C, E2) outputs a voltage corresponding to a predetermined exposure amount (kEv) for correcting the average photometric output. When the exposure control operation starts and the output terminal (02) of μmcomill becomes 'High', the output of the inverter (INI g ) becomes 'Low', and the AND circuit (A N 4 ', I
The output becomes "l L OWI+", the metering mode is switched to partial metering, and partial metering output is given to the transistor (BTz).Therefore, the camera aperture and exposure time are the average metering output plus kEv. The amount of light emitted by the flash light emitting device (FL) is controlled by partial photometry.The reason for doing this is as follows.

That is, in most cases of flash photography, the main subject for which proper exposure is to be obtained by flash light emission is often placed in the center of the photographic screen. Therefore, when using average metering to measure the light reflected from the subject due to flash light emission, it also measures the light reflected from the subject due to steady light from sources other than the main subject.
The probability that the light emission stop signal is outputted earlier than the time when the main subject is given proper exposure increases the probability that the amount of light emission will be insufficient. Therefore, the amount of light emitted is controlled by measuring the light reflected from the subject by flash light emission from the main subject using partial photometry. In addition, when shooting with flash, the sub-subject is brighter than the main subject, and the value obtained by adding a certain value to the average photometry output is considered to correspond to the brightness of the sub-subject. The added value controls the camera's aperture and exposure time, and the sub-subject is properly exposed based on the amount of light reflected by the subject due to constant light.

The value of k may be determined by performing a large number of flash photography and selecting a value that has a statistically high probability of providing the most appropriate exposure; for example, k = Q, about 5 Ev. In this case, before starting the exposure control operation, the output of the OR circuit (0 艮 1) is
The light emitting diode (A V L ) is turned on by "l(igh") to indicate that the average photometry mode is set.

Next, when performing flash photography in the AE flash mode, the signals (FC) and (AL) become 'High', the gate of the AND circuit (ASS) opens, and the inverter is activated by the metering mode changeover switch (ASS). The signal from (IN2) is output from the AND circuit (ASS).

Therefore, as in the case of natural light photography, it is possible to choose between partial photometry and average photometry. Furthermore, inverter (IN4)
, the output of the AND circuit (AN7) becomes “'Low” and the analog switch (AS4) becomes non-conductive.

(ASs) conducts, and the output from partial photometry or average photometry is directly input to the A-D converter ('AD) and taken into μ-com (11).Based on this photometry output, the camera's aperture and exposure time are adjusted. Then, the exposure control operation starts and is applied to each reset terminal of the μmcomFll control circuit (CA) to reset these circuits, flip-flops, etc. (OSC).
is an oscillator, and its output is given to the clock terminal (CL) of μmcom ili and the input terminal of the frequency divider (DV). The clock pulse (CI) output from the frequency divider (DV) is the D flip-flop (DFl) ~
(i) Fa) is input to each clock terminal, and signals for various switches (7) 141 input and μmcomfl
It is used to synchronize the operation of the Further, this pulse (DP) is input as a control clock to an exposure time control circuit (CT) and an aperture control circuit (CA).

(MS) is a photometric switch, which is closed during the first step of pressing the release button (not shown).

This closing signal is applied to D in synchronization with the clock pulse (cp).
The data is sequentially taken into flip-flops (DP3) and (DP4). When the 9 output of the D flip-flop (1) F4) becomes 'high', the switch (MS) remains closed and the output of the inverter (INlt) becomes 'high'.
If it is "High", the AND circuit (AN9) becomes "High" and the input terminal (1
A 'High' signal is input to 1). (CS) is a count switch, which is closed when the shutter (not shown) starts opening. When this switch (CS) opens, the output of the inverter (IN12) becomes High”,
At the rising edge of the clock pulse (cp), the Q output of the D flip-flop (DFs) becomes ")-Iigh'".

This Q output is input as a count start signal to the exposure time control circuit (CT) to start counting the exposure time. This exposure time control circuit (CT) is μmcom(1
Exposure time signal T given from output terminal 1 (OPz)
Count 2 times based on v. The diaphragm control circuit (CA) receives the diaphragm stage number signal Av - Av given from the output terminal ((JP3)) of the pulse number μm+:om(ll) from the start of lens diaphragm.

When the number of pulses matches the corresponding pulse number, the aperture stopping operation is stopped. (DPI) is the exposure time signal 'rv, the aperture value signal AV, and the amount of overexposure or underexposure ΔEv.
, over warning, under warning, etc. For example, the segment terminal (SEG
) and a liquid crystal that is time-divisionally driven by signals from a common terminal (COM).

A switch (GS) is connected to a contact (EC) when the exposure control operation is completed, and is switched to a contact (WC) when the charging operation of the film winding and exposure control mechanism (not shown) is completed. Further, the switch (R5) is a switch that is closed when the release button is pressed in the second step. When the exposure control operation is completed, the switches (C, S) are connected to the contacts (EC), and the output of the inverter (IN 14) becomes "High".
(110) A "High" signal is applied to the input terminal (i4) and 1. From the one-shot circuit (O53) “
A "High" pulse is output. This resets the flip-flops (FF1), (FF2) and the D flip-flops (DPI), (DP2).

Therefore, when the exposure control operation is completed, the release button remains pressed (that is, the release switch (R5
) is closed and the output of the inverter (INs) becomes “High
h”), the flip-flop (FF1) is reset, so the AND circuit (ANs
) output becomes “Low”. When the charging operation of the exposure control mechanism is completed, the switch ('GS) contacts (
WC) and the output of the inverter (IN15) is “
High” and the one-shot circuit (054) outputs “
A high-level pulse is output. This sets the flip-flop (FF 1) and opens the gate of the AND circuit (ANs).
If the switch (R5) remains closed or is closed, the output of the AND circuit (ANs) becomes “High”'
This “High” signal is sequentially connected to the D flip-flop (DFI) in synchronization with the black and vine pulses (cp).
), (1) F2). If the release switch (R5) remains closed when the q output of the D flip-flop (DP2) becomes "i (high"), the output of the AND circuit (AN s ) becomes "High". Then the flip-flop (FFz) is set and μ-c
om fil interlaced terminal (to io, “Hi
gh” signal is input.

(RL)' is the output terminal (02) of p-Coml1l
When RL becomes "High", the release circuit (RL) performs the release operation of the exposure control mechanism, and the exposure control operation is started by the operation of this circuit (RL). The A-ff converter (AD) has p-(om (11(7)) output terminal (01) “H”.
When it becomes "high," the photometric output is subjected to A-D conversion as described above.Here, if the lens open aperture signal is AvO, the film sensitivity signal is Sv, and the subject brightness signal is Bv, the photometric output is Bv -1-Sv. -Avo or Bv-4-k
-)-5v-Av.

It becomes. This A-D converted data is
It is input to the input terminal (10) of the selector (MP). (
'TS) is a means to output the data Tvs of the set exposure time, and this data is sent to the data selector (MP).
is input to the input terminal (Il:) of. (APS) is a means to output the data Avs of the set aperture value, and this data is input to the input terminal (MP) of the data selector (MP).
I2). (AO5) is means 0 for outputting data Avo of the open aperture value of the interchangeable lens, and this data is input to the input terminal (13) of the data selector (MP). (AMS) is a means to output the data Avm of the minimum aperture value of the interchangeable lens.
It is input to the input terminal (I4) of the selector (MP). (PO5) is means for outputting data f on the focal length of the interchangeable lens, and this data is input to the input terminal (I5) of the data selector (MP).

(MOS) is a means to output the data of the set exposure control mode, and this data is sent to the data selector (MP
) is input to the input terminal (I6). The data selector (MP) is the output terminal (OP 1) of μmcomill.
) input terminals (10) to (I6) according to the data number from
The input data is sequentially output to the input terminal (IPl) of μ-com (1). In this embodiment, the output terminal (OP
If the data from 1) is OH', then the data Tvs from (11), if "l H", the mode data from (I6), and if "= 2 H'l, the data Avs from (I2), If “3H”, data Avo from (I3), if “4H”, data Avm from (I4), “5H”.
``If (I5), then data f, ``5 H'', then (work 0) data Bv 10Sv -Avo or B
v 10Sv -1-k -Avo data are respectively output.

The output terminal (03) of μm COm fil is the input terminal (
When the closing signal of the photometric switch (MS) is input from it), it becomes “High” and the impark (INIO)
The output of the transistor (BTI) is set to "Low" to make the transistor (BTI) conductive. When the transistor (BTl) becomes conductive, a reset signal is output from the power-on reset circuit (PO2), and the exposure time control circuit (CT) and aperture control circuit (CA) are reset via the OR circuit (OR4). Ru.

A circuit that is directly supplied with power from the power supply battery (BA) via the power supply line (+V B ) is an AND circuit (ANs).

(ANe), (ANe), inverter (IN
s), (INto).

(INll), (IN12), (INta)
, (IN14) , (IN15) , D flip
Flop (i)Fx) , (DF2) , (DFa),
(υF4).

(DFs), (DF6), flip-flop (FF
t).

(FF2), OR circuit (OR2), (OR4), display section (1) Pi), oscillator (OSC), frequency divider (DV)
, one-shot circuits (O3a), (O34), and μmcom(1), and the remaining circuits are powered from the power supply line (+VB) via the transistor (BTl). In addition, the light emitting die t-)' (FL), (AVL)
, (SPL), (ALL) are transistors (BTs)
The power supply is controlled by This transistor (B
Ta) becomes non-conductive when the release switch (, R5') is closed and the flip-flop (FF2) is reset, and the light-emitting diodes (FL), (AVL), (
SPL) and (ALL) are turned off.

The operation of μmcom (11) will be explained based on the flowchart in FIG. , μmcam (1) is in the "HALT" state when not in operation, resulting in low power consumption, and the interlaced terminal (i (
), or when a "High" timer interrupt signal is output from the internal timer every time a certain period of time elapses after entering the "HALT" state, The operation starts from the above specific address.

When an interrupt occurs, first this interrupt is sent to the interlaced terminal (i
Determine whether the interrupt occurred due to the input of the “f(igb)” signal to Then, in step #15, the photometric switch (MS) is closed and it is determined whether the input level to the terminal (11) is "High". is closed and the input terminal (11) is "High", move to step #16, set the terminal (03) to "High h", make the transistor (BTl) conductive, and connect the power supply line ( +VB
) to start supplying power. Then, in step #17, the timer interrupt is disabled, and in step #18, the timer register TR and timer flag T, which will be described later, are set.
Reset the RF and proceed to step #19. #1
At step 9, the AE flock switch (ALS) is closed and the input level of the input terminal (12) is 'H'.
terminal (12).
If is "Low", the flow shifts to the exposure calculation flow starting from step #4,0. On the other hand, input terminal (12)
If is “High”, set the photometry flag L in step #24.
Determine whether MF is "1". This flag LMF is set to "1" when the calculation of exposure control data in μ-com (11) is completed, and is set to "0" when the calculation of exposure control data is not completed. in,
Flag LMF is 0 even if AE flock mode is set.
If it is determined that the calculation of data for exposure control has not been completed, the process moves to the flow for exposure calculation starting from step #40.If the flag LMF is "1", calculation of data for exposure control is determined. When it is determined that the
In step #25, an AE flock flag ALF, which will be described later, is set to "1", and the flow proceeds to step #42 for calculating data for exposure control.

If it is determined in step #15 that the photometric switch (MS) is not closed, A'E is determined in step #20.
It is determined whether the open switch (ALS) is closed and the input level to the input terminal (12) is "PI i g h", and the input terminal (12) is "t(
If the output terminal (03) is “High”, the process moves to step #21. In the steps after #21, the output terminal (03) is set to “High” and the transistor (
BTz) is made conductive to reset the power supply line flag TRF, and the process proceeds to step #24 described above. In step #24, as described above, if flag LMF is "0", go to step #40, and if LMF is "1", go to step A
LF is set to "1" and the process moves to step #42.

When it is determined in step #20 that the input level to the input terminal (12) is "Low", it is determined in step #26 whether the timer flag (TRF) is '1'°. Here, the timer flag TRF is a flag that is set to "1" when a certain period of time has elapsed after the photometry switch (MS) or the AE flow switch (ALS) was opened. Therefore, if the flag TRF is “1”, “
HALT” state.

On the other hand, when the timer flag TRF is "0", the exposure control operation is completed and the switch (CS) becomes the contact (EC).
is connected to the input terminal (i4) and the input level to the input terminal (i4) is “
If the input terminal (i4) is "High", determine whether the photometry flag LMF is 1" in step #30, and it must be 1". If the flag LMF is "1++", the photometry and exposure control data have been calculated before reaching this step, and the transistor (BTl) remains conductive. Since exposure display is also being performed, the process moves to steps #35 and subsequent steps. In step #35, the timer flag TRF is set to 1'', and in step #36, the output terminal (
03) is set to "Low" to make the transistor (BTl) non-conductive, and in step #37, the above exposure display is erased.
Reset the flag LMF in step #38'')I
ALT” state.

On the other hand, the input terminal (i4) is set to “Low” in step #27.
”, the charging operation of the exposure control mechanism has been completed and the exposure control mechanism is enabled. In this case, “1” is set in the timer register TR in step #28.
In step #29, it is determined whether the contents of the lever register TR are larger than a certain value. Then, if (TR)≦, the flow shifts to the calculation of exposure control data starting from step R40, and (T
4)) If it is K, the process moves to the steps after #35 described above. Therefore, if the charging operation of the exposure control mechanism is completed, the calculation and display of exposure control data will be repeated for a certain period of time even if the photometry switch (MS) or the AE float switch (ALS) is open, and the charging operation of the exposure control mechanism will continue. If the operation is not completed, the calculation and display of the exposure control data is repeated only while the photometry switch (MS) or the AE flow switch (ALS) is closed.

At step R40, the AE flock flag ALF is set to “0”
is set, and the process moves to step R41.

Here, flag ALF is still A- in AE flock mode.
If the D-converted photometric value has not been imported and the calculation of data for exposure control has not been completed, or if the mode is not AE flock mode, the value is “0”. This flag becomes "1'" when the process is completed. At step R41, terminal (01)
to “High” and input A to the A-D converter (AD).
-D conversion operation is started and the process moves to step R42.

If you have already taken in the A and -D conversion values in the AE flock mode, do not perform steps R40° and R41, and perform steps R19, #24. as described above. The process moves to step R42 via step #25.

In step R42, a register (DSR) for selecting data selectively output from the data selector (MP) is reset, and in step R43, the contents of this register (DSR) are transferred to the output terminal (opt). Output. Then, the input terminal (IPI) is selectively selected from the data selector (MP) according to the contents of this register (DSR).
Import the data input into step R44,
In step R45, the contents of the register (DSR) are set to '1'.
is added, and it is determined in step R45 whether the flag ALF is "1". Here, when the flag ALF is '1', it is checked in step R47 whether the content of DSR is 6'' or not.
When LF is "θ", it is determined in step R48 whether the content of DSR is "7", and the content of DSR is "7".
6" or "7", if not, return to step R43 and repeat the above operation. By this operation, if the contents of DSR are "OH", Tvs, "LH", mode data, "2H", Avg, " 3H″ is Avo, M
4H”, Avm, and “5H”, f are input terminals (
IPl). If the flag ALF is "1", there is no need to import the A-D conversion data, so when the DSR becomes "6H", the process moves to step R49 and the flag A
If LF is "OI+, 6H", take in By 10Sv -Avo or Bv -4-Sv + k -Avo D
When the content of SR becomes "7H", the process moves to step R49.

In step R49, the flash photography mode signal is input from the flash light emitting device (FL), and the input terminal (R3) goes high.
Determine whether it is “High”.
If not, perform the calculation for constant light photography in step R53, and then proceed to step #54.R4
When it is determined that the input terminal (R3) is "High" in step 9, the AE floater switch (ALS) is closed and the input terminal (R2) is closed in step R50.
It is determined whether or not it is "High".

Then, if (12) is ``High'', the calculation for flash photography in AE flash mode is performed in step R51, and the process moves to step R54, and if (iz) is ``Low'', the calculation for flash photography in normal mode is performed. After that, the process moves to step R54. #51. The calculation for #52 flash photography is shown in Figure 5.

This will be described later based on FIG.

In steps # to 54, the above-mentioned #'51, R52,
Since the calculation of the exposure control data has been completed in any step of #53, set the flag LMF to 1''' and press R.
In step 55, set the A-D conversion control terminal (Ol) to Lo.
w'" and set the release flag RL in step R56.
It is determined whether F is "1" or not. Release flag RL
F is a flag that is set to "l" in step #2, which will be described later, because the interrupt is caused by the closing of the release switch (R5).When this flag is "1", the release switch (R5) is closed. ) is closed in this step #5
6, so the exposure display is turned off in step #59 and the process moves to steps #6 and onwards. Flag RLF
If it is "0", the release switch (R5) is not closed, so the exposure display is performed and $47. Enable the timer interrupt that was disabled in step #22.
)(ALT” state.

If it is determined in step #0 that the release switch (R3) is closed and a "high" signal is input to the interrupt terminal (io), interrupts are disabled in step #1. In step #2, the release flag RLF is set to "1°".Next, in step #3, the terminal (0
3) to °' High h” and the transistor (B
Tl) is made conductive, a blank display is made in step #4, and it is determined whether the flag LMF is "t" in step #5. Here, if LMF is "0", the calculation of exposure control data has not been completed, so move on to the flow of calculation of exposure and control data from #40, and if LMF is "1", exposure control data has been calculated. Therefore, move to step #6.In addition, if you move to the calculation flow from #40,
When the data calculation is completed, the process moves from step #56 to step #6.

In step #6, terminal (02) is set to "' High
h”, the release circuit (RL) starts the exposure control operation, and as mentioned above, the metering mode is switched to partial metering mode for controlling the amount of flash light emitted.Then, from then on, the mechanical sequence of the camera is changed. Based on this, the aperture narrowing down operation is started, and the narrowing down stage number data Av - Av is output from the output terminal (OF2).

When the aperture is narrowed down by an amount corresponding to
) stops the diaphragm operation, and then the reflection mirror moves up. When the reflection mirror has finished rising, the shutter starts opening and the count switch (
CS) is closed, and the exposure time control circuit ('CT) starts the opening operation after time 2 based on the data Tv from the output terminal (OF2). In addition, when taking flash photography, when the shutter is fully open, the X contact closes, causing the flash device (FL') to start emitting light, and when the amount of light reflected from the subject due to the flash light emission reaches a predetermined value, the flash light is emitted. Operation is stopped. Then, when the shutter is closed, the reflecting mirror is lowered, and the aperture is opened, the switch (GS) is connected to the contact (EC), and the p-com
(The input terminal of ll (i becomes “High”. μ-C
Om(1) indicates that the input level to the input terminal (i4) is “H”.
When it is determined in step #7 that the state has become “high”, the flag (RLF) is set to “0” in step #8.
In step 9, set the output terminal (02) to “Low” and #
10 steps to enable interloved “'1 (
ALT" state. In this state, a timer interrupt occurs and the photometry switch (MS) is activated.

If the AE floc switch (ALS) is not closed, $27. After step #30, the flow moves to step #35, and the above-mentioned transistor (BTI)
Operations such as stopping power supply are performed.

The operations from step #63 onward show operations when power supply to μmcom (1) is started and a reset signal is input from the power-on reset circuit (POl) to the reset terminal (RE). First, in step #63, output terminals (01), (02), and (03) are set to “L”.
ow” signal, reset and turn off the registers and flags RLF, LMF, DSR, and TR using the step knob #64, and display a blank display at step #65.
The timer flag TRF is set to 1" to enter the "HALT" state.

FIG. 5 is a flowchart showing a specific example of the calculation for flash photography in the AE flock mode in step #51 of FIG.

In #70 Norotep, the above-mentioned Ste Tsubu #43 to #48
Based on the A-D conversion data (Ev −Avo ) taken in from the input terminal (IPl) and the open aperture value data Avo, (Ev −Avo ) +Avo =Ev ・=−(1
Perform operation 1. Next, when the content of the DSR is "IH", the exposure control mode signal output means (MOS) is sent to the input terminal (1, Pl) i (both the aperture value and the exposure time are automatically It is determined in step #71 whether or not the mode is the so-called program mode (hereinafter referred to as P mode), and if it is P mode, the process moves to step #72 and subsequent steps for calculating exposure control data for P mode. #7
In step 2, tz ・E v = A v (0<a<1) based on Ev calculated by equation (1).
---(Perform 21 operations to calculate Av. #7
In step 3, fil, E calculated by f2+ formula
v, Av based on Ev - Av = Tv song - (31 calculations are performed to calculate 'fv. In step #74, the calculated Tv is the exposure time Tvf of the flash synchronization limit (for example, l/250 Sec ). At this time, if T v > Tv f, it will be slit exposure, so the exposure time Tvf of this tuning limit is determined.
As the control exposure time, proceed to step #75, E v - T v f = A v
--[Perform 41 calculations. In step #76 (4
) It is determined whether the aperture value Av calculated by the formula is larger than the minimum aperture value Avm of the interchangeable lens. Here, Av
When ≦A v m, Tvf is output terminal (OP2)
, the number of refinement stages Av - Avo is output to the output terminal (OP a
) and proceed to step #121.

On the other hand, if Av > Avm, set Tvf to (OP2).

Avm-Avo is output to (UP 3), over warning data is set, and the process moves to step #121.

Furthermore, depending on this setting data, the display section (D P,
) is displayed as a warning.

When Tv≦Tvf is determined in step #74, #
In step 82, it is determined whether Av calculated by equation (2) is smaller than the open aperture value Avo.

At this time, if Av < AvO, Avo is used as the control aperture value and in step #83 E V - A v 'o = T v
-.-"
If it's vo, it's Tv.

is narrowed down to (OP 2 ), data of 0 is output as the rank number (OP 3) □\, and after setting the under warning data, the process moves to step #121.

On the other hand, if T v > T v o is determined in step #84, Tv calculated by equation (5) is output to (OP2), the number of refinement stages 0 is output to (OPa), and the process goes to step #54. Transition.

In step #82, if it is determined that AV≧A v o, Tv calculated by equation (3) is expressed as (OP2
) and the number of refinement stages A v −A vo based on Av calculated by equation (2) are output to (OP3), and the process moves to step #121.

Next, when it is determined in step #71 that the mode is not P mode, the process proceeds to step #92, and it is determined whether the mode is the aperture priority exposure time automatic control mode (hereinafter referred to as A mode). If it is A mode, first, in step #93, Ev calculated by formula (1) and the read aperture value Avs, etc.) E v − A v s = T v
---...(Perform 61 operations.#
In step 94, it is determined whether Tv calculated by equation (6) is greater than Tvf, and if Tv), then the process moves to the steps after #75 described above, and if Tv≦Tvf, the process moves to step #95. . Tv in step #95
(Determine whether Tvo or not. Here, Tv < T
When it is determined that it is vo, T is determined in step #96.
Ev-Tvo=Av, where vo is the control exposure time.
...Perform the calculation in (7), and in step #97, (
7) Determine whether Av calculated by the formula satisfies Av<Avo. Here, if Av < Avo, set Tvo to (OP z ) and set the number of refinement stages 0 to (OP
3), set the under warning data, and proceed to step #121. On the other hand, Av≧Avo
Then, Tvo to (OP2), A calculated by equation (7)
The number of refinement stages Av - Avo based on v is output to (OPa), respectively, and the process moves to step #121.

Also, if it is determined in step #95 that Tv≧1゛■0, the process moves to the steps after #90 described above,
The Tv calculated by the formula (6) is transferred to (OP2), and the number of aperture stages Avs -Avo is based on the set aperture value Avs.
are output to (OP3) respectively, and the process moves to step #121.

Next, when it is determined in step #92 that the mode is not A mode, it is determined in step #103 whether the exposure time priority aperture automatic control mode is lower (hereinafter referred to as S mode). When it is determined that it is in S mode, #10
In step 4, it is determined whether the set exposure time Tvs is greater than the tuning limit exposure time Tvf. Tvs≦Tvf
If so, just move on to step #1o6 and 'l”vs
> For Tvf, T in #105 (7) steps
After setting vf to Tvs, the process moves to step #106. In step #106, based on this Tvs and Ev obtained by equation (1), E v −T v s = A v ·
Perform the calculation of river -・-,, -(8), and in step #107, Av calculated by equation (8) is Av −< Avo
Determine whether or not. Here, AV <
If it is Avo, proceed to the steps after #83 described above. On the other hand, if Av≧Avo, #
In step 108, it is determined whether Av>Avm. If AV > Avm, in the step of $109, set the control aperture value to Avm, and calculate E v −A v m =T v ・−Tune・−・−(Perform the calculation in 91, and in the step #110, check if Tv > Tvf? Here, Tv≦
If Tvf, move to step #111, set Tv calculated by equation (9) to (OPz), and set the number of refinement stages Avm.
-Avo is output to (OPa), respectively, and the process moves to step #121.

On the other hand, if it is determined that Tv > Tvf in step #110, Tvf is output to (OPz), the number of refinement stages Aym - Avo is output to (OPz), over warning data is set, and step #121 is performed. Move to step.

In step #108, Av calculated by equation (8) is A
When it is determined that v≦Avm, the above-mentioned #9
Shift to step 0 and set the exposure time Tvs (
OPz) and the number of refinement stages Av - Avo based on Av calculated by equation (8) are output to (c) F3), and the process moves to step #121.

If it is determined in step #103 that the mode is not S mode, a mode in which both the exposure time and aperture value are controlled by manually set values (hereinafter referred to as M mode) is set, and #116 Set exposure time T in step
It is determined whether vs is larger or smaller than the tuning limit exposure time Tvf. 'l'v s ('I'v If f, proceed directly to step #119 and Tvs) If Tvf, set Tvf to Tvs and then proceed to step 28119. Then, set Tvs to (OPz) , the number of aperture steps Avs −Avo based on the set aperture value Avs (OP
It outputs the output to a) and moves to step #121.

In step #121, the exposure time Tv calculated by the above operations, the aperture value Av, and Ev calculated by equation (1) are
Based on Ev-(TV + AV) = ΔE V ・=-=-
=-(10) is performed, and the display unit (DPl) is displayed at the step of the data indicating how far the flash photographing will deviate from the appropriate exposure for the secondary subject if exposure control is performed based on these Tv and Av. ) is displayed.

FIG. 6 is a flowchart showing a specific example of the calculation for flash photography in the normal photography mode in step #, 52 of FIG. In step #130, the captured A
From -D conversion value EV+ -Avo and the open aperture value Avo of the interchangeable lens (Ev + -A'vo) -4-Avo = Ev-4Jc
, , , , , , (11) are performed, and in step #131 it is determined whether the mode is P mode or not. When it is determined that it is P mode, first, #1
32, step #136, the focal length of the interchangeable lens is 39 mm or less, 31 fight ~ 6 Qrrnn, 61
It is determined which region above mm12 is located. #13
In step 2, it is determined whether the focal length f of the interchangeable lens is 30n or less, and if it is determined that it is 3Qim or less, the AVI is set to 5 (
F5.6), Av2 to 8 (F16), Tv
Set z to 5 (''/;+, o SeC,) and move to step #143. In step #136, f becomes 31m.
If it is determined that it is in the intermediate region between m and 5Q am, Avx is set to 4 (F4) and AV
2 to 7 (Fil).

Set the TVI to 6 ("/6o 5eC) and move to step #143. If it is determined in step #136 that f is 61 degrees or more, set the AVI to 3 (F2 .8), AV2 to 6 (F8)
, Tv1 is set to 7 (l/125SeC) and the process moves to step #143.

Here, Avl is the most open limit aperture value to prevent the depth of focus from becoming shallower than a predetermined amount, Av2 is the smallest aperture limit value to reduce the probability of insufficient light emission, and Tv
l is the limit exposure time of the camera shake limit, which is determined depending on the length of the focal length of the lens.

The reason why Avz is changed depending on the focal length of the interchangeable lens is as follows. That is, it is generally known that during flash photography, the area of the main subject occupying the photographic screen is statistically distributed with a certain value as the maximum value.

In other words, flash photography is often done with the main subject placed at a predetermined shooting distance that corresponds to the sunspot distance of the interchangeable lens used, and the aperture is determined by this shooting distance and the amount of flash light emitted by the flash device. If the lens aperture is set to a smaller value than this value, there is a high probability that the amount of flash light will be insufficient. Therefore, in the case of flash photography using a short focal length interchangeable lens, the subject is relatively close, and the limit aperture value Avz is set to a value on the small aperture side corresponding to this distance. In the case of flash photography using , the subject is relatively far away and the limit aperture value AV2 is set to a value on the open side.

In step #143, determine whether Avi (Avo), and if AVI > Avo, proceed to #145.
Move to step #1 if AVI < Avo
After setting the AVI to Avo in step #44, the process moves to step #145. In step #145, (10
) Based on Ev and Avl calculated by the formula (Ev
-1-k)-AV1=Tv...-=
- Perform the operation (11), and in step #146,
l”v (Determine whether or not Tvt. At this time, TV<
For TVI, 'l'v s to (OP2), AVl
-Avo is output to (OP3), under warning data is set, and the process moves to step #208.

If T v > T v 1 in step #146,
In step #151, it is determined whether Tv calculated by equation (11) satisfies Tv > Tvf. Here, if 'rv>Tvf, then $152 (7),, as the exposure time for controlling 1-Vf (Ev1k)-'rvf=Av ---------
---- Perform the operation in (12) 1. Av calculated by formula (12) in step #153 is Av) AV
It is determined whether the value is 2 or not. Av) Av
2, Tvf is (OPz)1(, AV2- Avo
are respectively output to (OP3), over-warning data is set, and the process moves to step #208. Av≦
For AV2, Tvf is (OP2) IC1 The number of refinement stages Av - Av based on Av calculated by equation (12).

are output to (OP3), respectively, and the process moves to step #208. On the other hand, Tv calculated by equation (11) is Tv
If it is determined in step #151 that ≦T v f, the process moves to step #159 and this Tv is determined as (O
Avt-Avo is further output to (OP3) to P2), and the process moves to step #208.

For example, the above operation is performed when the focal length is f=50rr#N.

The case where an interchangeable lens with an open aperture value of F 1.4 (Av" 2) and a minimum aperture value of F22 (Av = 9) is attached to the camera body will be explained. In this case,
Av1 = 4 (F4), AV2 = 7 (F ll)
, Tvt = 6 (1/605ec) is set.

Here, if k = Q, 5 Ev, Ev(9,5
Then Av=4=Av1. Tv==5=Tvx, 9
．． 5< E v < 10.5, Av=4=Avs
, Tv=(Ev-1-k)-Avl, and 10.5≦
When Ev≦13.5, Tv = 8 = Tv f .

Av'=(Ev-1-k)-Tvf, and EV>
13.5 then Av=7. =Avz, Tv=8=Tv
It becomes f. Therefore, Ev (9,5) is a so-called full flash mode in which the main subject is properly exposed with the amount of flash light emission, and the exposure of the secondary subject is not taken into account.
In the range +5 < Ev < 13.5, the main subject is flashed and the secondary subject is steady light, both of which are properly exposed.
Eye 1 - in flasb mode, 13.5 < E
In V, the mode is such that the main subject is properly illuminated with flash light, and the sub-subject is overexposed.

If it is determined in step #131 that it is not in P mode, it is determined in step #161 whether it is in A mode, and if it is in A" mode, it moves to the steering knob from #162 onwards. #162 to #166 In step #, data on the long exposure limit exposure time determined according to the focal length of the lens is set to Tvl, as in the case of P mode.
In step 167, the data E obtained using the formula (1)
Based on v-1- and the set aperture value Avs, (E v1k ) -A v s = Tv ・-
= Calculate (13). In step #168, (
13) Determine whether Tv calculated by formula is smaller than Tvl, and if Tv < Tv s, convert Tvl to (OP2
) in, Avs −Av.

are output to each OPs, under warning data is set, and the process moves to step #208. In this case fu
ll flash mode.

If Tv≧”l'v 1 in step #168, #1
In step #72, it is determined whether Tv >'I''vf, and if Tv ) Tv f, then in step #173, Tv
Let f be the exposure time data for control (E v 1k) −Tv f =A v −
... Perform the calculation of -=-(14). If Av > Avm, set Tvf to (OP2), and set the number of narrowing stages Avm -A.
Output vo to (OP3), set over warning data, and proceed to step #2o8. . On the other hand, if AV≦Avm, the number of refinement stages Av - Avo based on Av calculated by equation (14) is output to Tvf (OP2) and (OPz), respectively, and the process moves to step #208. In this case, it is fill-in flash mode. Also, in step #172, (13)
When it is determined that Tv calculated by the formula is TvsTvf, Tvl<: Tv<: Tvf, Tv is set to (OP2) and Avs - Avo is set to (OP2).
a) -\ Each is output and the process moves to step #208. This case is also a fill-in flash mode.

If it is determined in step #161 that the mode is not A mode, it is determined in step #182 whether or not the mode is S mode.

When in S mode, proceed to step #183, determine whether the set exposure time Tvs is shorter than the tuning limit Tvf, and if Tvs≦Tvf, proceed directly to step #185, and if Tvs > 1 'vf is 17v
After setting f to Tvs, the process moves to step #185.

At step #'185, (Ev 185) - Tv 5 = Av -----...
. . . The calculation in (15) is performed, and it is determined in step #186 whether Av calculated by equation (, 15) is larger than Avo. Here, if Av < Avo, then
In step #187, set Avo as the control aperture value, (
E v-1-k )-Avo = Tv ---
−・−−−−−−−(15) is calculated, and the calculated Tv
In step #188, it is determined whether Tvo is longer (smaller) than the maximum exposure time Tvo. Tv<T
If it is vo, move Tvo to (OPz) in step #189,
The data on the number of refinement stages is set to 0 and outputted to (OPa), and under warning data is set, and the process moves to step #208. Tv calculated by equation (16) is Tv
When it is determined in step #188 that ≧Tvo, this Tv is output to (OP2), the number of refinement stages O is output to (OP a ), and the process moves to step #208.

On the other hand, if it is determined in step #186 that Av calculated by formula (15) is Av>Avote, #194
In step , it is determined whether this Av is larger than the minimum aperture value Avm. Here, if Av>Avm,
In step #195, using Avm as the control aperture value, ('EV + k) -A vm=T v
---------- Perform the calculation of (17), and determine in step #196 whether Tv calculated by equation (17) is larger than the tuning limit exposure time Tvf. Tv ＞
If Tvf, use Tvf (OP2), Avm AVO
are respectively output to (OP3), set over warning data, and proceed to step #208. 1゛v
If ≦Tv [, then rv is output to (OP2) and Avm - Avo is output to (OPa), respectively, and the process moves to step #20-8. On the other hand, Av calculated by equation (15) is Av
If it is determined in step #194 that it is sAvm, Tvs is transferred to (OP2), and A calculated by equation (15) is
v (μ base) (Av − Avo is output to (OP3), respectively, and the process moves to step #208. In this S mode, Tvo + Avo < Ev + k <
fill −in fla in the range of Tvf +Avm
sh mode, full flash outside the above range
mode.

If it is determined in step #182 that the mode is not 5, it means that the M mode is set, and the process proceeds to step #204, where it is determined whether Tvs > Tvf. If Tvf≧Tvs, the process directly moves to step #206, and if Tvs>Tvf, the process moves to step #206 after setting Tv[ to Tvs. And #20
6 step 'rvs to (O20), Avs -A
v.

After outputting them to (OF2), the process moves to step #208.

In step #208, ( Ev
10k) and the control values Av, Tv found as above
Based on (Ev-4-k)-(Av-1-Tv)=ΔEv=
By performing the calculation in (18) and controlling the exposure based on these Tv and Av, data indicating which degree of distortion deviating from the appropriate IE exposure is to be taken for the secondary subject is calculated. . When step #208 is completed, the fourth
The process moves to step #54 in the figure. Note that this calculated data is displayed on the display section (Dpt) in step #57.

Although no specific example is shown for the calculation for ambient light in step #53 of FIG. 4, basically the same flow can be used if Tvf is replaced with Tvm for a minimum exposure time of 8 in the flow of FIG.

FIG. 7 is a circuit diagram showing a main part of a modified example in which a part of the embodiment shown in FIG. 1 is modified. In this modification, when performing flash photography for AE photography, the amount of flash light emission is controlled by partial metering using the light receiving element (SP1), and the exposure amount of the camera is controlled only by the light receiving element (SRD). This is done using ambient photometry (photometering only for the secondary subject). In addition, in the above-mentioned embodiment, the light receiving element ('5PD), (
It was necessary to add a predetermined value k from these received light outputs because the output was configured to take out the output of the light receiving element (SRD), but in this example, the output of only the light receiving element (SRD) was used to extract q. The above correction is not necessary.

During ambient light photography, if the switch (ASS) is connected to the contact (AV), the signal (AL) becomes ``High'' when the AE flock mode is set, and the The output of the circuit (AN25) is "High".

OR circuit (OR22), (OR23), (OR
20) cr) The output becomes “r4 i gh”.

Here, μm com (
Since the output terminal (02) of 1) is 'Low', the output of the AND circuit (AN27) becomes 'High'.This causes the analog switch (ASI), (ASIO
), (AS3) conduct, and the light receiving element (SRD), (SP
D) The average photometric output is adjusted by a variable voltage source (VSl).
It is input to the A-D converter (AD) through TE μm C
Om (taken into ll. Note that this variable voltage source (V
Sl) corresponds to the variable voltage source (VS) in FIG. On the other hand, when AE flock mode is not set, AND circuit (AN22), (AN24), OR circuit (OR circuit)
22), (OR2s).

The output of (OR20) becomes "Hi gh"'.

Also, while the terminal (02) is “Low”, the AND circuit (A
The output of N 27 ) becomes “'High”. This allows analog switches (AS 1) and (AS to) similar to AE flock mode.

(ASs) conducts and the average photometry output changes from the variable voltage source (VS
1) is input to an analog-to-digital converter (AD).

When shooting with constant light, if the switch (ASS) is connected to the contact (sp), 771' in AE flock mode.
Circuit (AN20), , t7 circuit (OR23), (
When the output of OR21) becomes "t (i g h"), the analog switch (ASIO) (As 2 ) is connected to the analog switch (ASIO). AD).On the other hand, A
When not in E-flock mode, AND circuit (AN2G)
, (AN22), OR circuit (OR21).

The output of (OR23) becomes "High" and the analog switches (ASlo) and (AS2) become conductive, and as in the AE flock mode, the partial photometry output from the light receiving element (SPD) is directly transferred to the A-D converter ( A D , ).

In flash photography, AE flash mode is selected and the switch (
Ass) is connected to the contact (AV) and average metering mode is selected, AND circuit (AN2S), OR circuit (OR23), (0艮22), (OR20
) becomes “High”. Also, μmco
While the output terminal (02) of m(1) is "Low", the output of the AND circuit (AN27) is "High". Therefore, the analog switch (ASl), (ASto
), (ASa) are conductive, and the average photometry output is changed from the variable voltage source (V
SL) to an analog-to-digital converter (AD). On the other hand, if the switch (ASS) is connected to the contact (SP) and partial metering mode is selected, the AND circuit (AN23)
, (AN25) , OR circuit (OR2g) , (O
The output of R2t) is "high" (Ah, the light emitting diode (AVL) is in average metering mode, (SRL)
(SPL) indicates the ambient light metering mode, and (SPL) indicates the partial metering mode.

In the above embodiment, the photographing screen is divided into two photodetectors (SPD) and (SRD), and the average photometric value is calculated by summing the outputs of both photodetectors. In addition, the photometry means was configured to selectively obtain peripheral photometric values using the light receiving element (S RD ).The method for obtaining such an average photometric value and two peripheral photometric values is limited to the above-mentioned configuration. Instead, the photometric means may be distributed at two locations to obtain an average photometric value and an m-minute photometric value, respectively, and the peripheral photometric value may be obtained by taking the difference between the two.For example, The first step to obtain photometric values
A second photodetector (spo) is placed at the bottom of the mirror box as shown in Figure 2, and a second photodetector (AVD) is placed to obtain the average photometric value.
) may be placed at a predetermined position of the publicly known pentaprism section.

Furthermore, although the light receiving element (SPD) is commonly used for calculating the exposure of the camera before the mirror is raised and for stopping light emission of the flashlight emitting device after the mirror is raised, it may be provided separately. For example, the light receiving element (
SPD) and (SRD) may be placed in the pentaprism section, and a light receiving element for partial photometry for stopping light emission of the flashlight emitting device may be placed in the lower part of the mirror box as in FIG. 2.

Effects As described above, the present invention provides a first photometry mode in which exposure calculation is performed based on a photometry value corresponding to the light intensity of a relatively narrow specific area of the shooting screen, and an area other than the specific area or the shooting screen. When performing flash photography with a camera in which one of the second metering modes is manually selected, which performs exposure calculations based on the metering value corresponding to the light intensity of the entire area, this setting is The aperture aperture of the photographing lens is controlled based on the photometry value in the second photometry mode, regardless of the photometry mode that has been set, and the aperture aperture of the photographing lens is controlled based on the photometry value in the first photometry mode of the subject brightness that has passed through the controlled aperture aperture. Since the flash photography device is configured so that the amount of flash light emitted by the flash light emitting device is controlled, when the main subject is placed in the above-mentioned specific area and flash photography is performed, the amount of light emitted by the flash light emitting device is controlled by the first metering mode. is the proper exposure,
By controlling the aperture aperture in the second photometry mode, the sub-subject is almost properly exposed, and a good photograph with well-balanced exposure can be obtained. Further, according to the embodiment of the present invention, since the aperture aperture control is made to correspond to the light intensity of the area excluding the above-mentioned specific area, the secondary subject can be properly exposed, and both the main subject and the secondary subject can be properly exposed. .

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the overall configuration of an embodiment of the present invention, FIG. 2 is an optical system layout diagram showing its photometric optical system, FIG. 3 is a plan view showing an example of the light receiving section, and FIG. 4 is μ-c in Figure 1
om(11); FIGS. 5 and 6 are charts explaining a part of the flow in FIG. 4 in detail; FIG. 7 shows the main part of the second embodiment of the present invention. It is a circuit diagram. S L' D: first light receiving section, SRD: second light receiving section, ASS: photometry mode setting means, LS: photometry value selection means, 1: calculation means, CA: aperture control means, GSS All light emission stop signal output means FL: Flash light emitting device. Applicant Minolta Camera Co., Ltd. I (-) OAH 1,000)
Continued from page 1 of HaSt 0 Inventor Masatake Niwa Osaka Kokusai Building Minolta Camera Co., Ltd., 2-30 Azuchi-cho, Higashi-ku, Osaka 0 Inventor Minoru Sekida Osaka Kokusai Building Minolta Camera, 2-30 Azuchi-cho, Higashi-ku, Osaka Inside the corporation

Claims (1)

[Scope of Claims] 1. A flashlight emitting device that outputs a flash photography mode signal when preparations for flashlight emission are completed, and that can receive reflected light from a subject that has passed through the aperture aperture of the photographic lens not only before photography but also during photography. a first light-receiving section that measures the light intensity of a relatively narrow specific area of the photographic screen, and a second light-receiving section that measures the light intensity of an area other than the specific area or the entire area of the photographic screen; a first photometry mode that performs exposure calculation based on the photometry value from the first light receiving section, and a second photometry mode that performs exposure calculation based on the photometry value from the second light receiving section. a photometry mode setting means for selectively manually setting one of the modes; a photometry mode signal output means for outputting a signal indicating the photometry mode set by the setting means; If the flash photography mode signal is not given before the shirt release, the photometry value according to the set photometry mode is input, and if no flash photography mode signal is given before the shirt release, the photometry value is determined according to the signals given from the flashlight emitting device and the photometry mode signal output means. When a flash photography mode signal is given, the photometry value in the second photometry mode is output regardless of the set photometry mode, and after the shutter release, the photometry value is output in the first photometry mode regardless of the set photometry mode. A photometric value selecting means for outputting a photometric value during a flash emission period, a calculating means for calculating an aperture value based on a photometric value before the shirt release outputted from the photometric value selecting means, and an aperture value from the calculating means. an aperture value control means for controlling the aperture aperture of the lens based on the aperture value; and an aperture value control means for stopping the light emitting operation of the flashlight emitting device when an integral amount of the photometric value outputted from the photometric value selection means after the shirt release reaches a predetermined value. What is claimed is: 1. A flash and light photographing device comprising a light emission stop signal output means for outputting a light emission stop signal. 2. When the flash photography mode signal is not given, the photometric value selection means outputs a photometric value corresponding to the light intensity of a specific area or the entire area of the photographing screen according to the set photometry mode, and the flash photography mode signal is given. 2. The flash photographing device according to claim 1, wherein a photometric value corresponding to the light intensity of an area other than the specific area is output regardless of a set photometric mode. 8. When the second light receiving section of the photometry means is provided to measure the light intensity of the entire area of the photographic screen, the photometric value selection means selects between a specific area of the photographic screen and an area excluding the specific area. a predetermined exposure amount output means for outputting a predetermined value corresponding to a predetermined exposure amount determined in relation to the predetermined exposure amount; The flash photography device according to claim 2, further comprising an adding means for adding the predetermined value from the output means.