JPH0532737B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a flash photography device that performs flash photography by changing an aperture according to the brightness level of a subject in a wide area of a photographic screen. Prior Art Conventionally, in flash photography, the amount of exposure due to constant light is reduced by a certain level compared to the appropriate exposure level using only constant light, and this constant level of exposure is provided by firing a strobe device. Various types of flash photography devices have been proposed. These conventional devices are based on the following idea. In other words, in backlit photography where the average metering output of the entire subject is high but the metering output of the main subject is low, the strobe device will It is necessary to raise the brightness level of the main subject by emitting light. By the way, if the average photometric output is at a high level, the amount of exposure due to constant light will be a value that cannot be ignored compared to the amount of proper exposure, and if the strobe device is made to emit light by the amount that would give the proper exposure, overexposure will occur. Therefore, in such a case,
The appropriate exposure amount may be obtained by combining the exposure amount due to constant light and the exposure amount due to light emission from the flashlight emitting device.To this end, the amount of exposure due to constant light is reduced by a certain value according to the appropriate exposure amount. The remaining amount of exposure is provided by light emission from the strobe device. On the other hand, since the main subject is statistically often photographed at the center of the photographic screen, the photometric sensitivity distribution of conventional average metering methods is It is generally designed to have a center-weighted sensitivity distribution with high sensitivity. As mentioned above, flash photography is generally performed by firing a strobe device even though the output level of the photometric means is high when the main subject is backlit and is darker than the secondary subject. Under these conditions, the output of the average photometry means using constant light is strongly influenced by the dark main subject in the center, and is at a level lower than the luminance level of the sub-subject. If you control the exposure with the intention of setting the secondary subject at an appropriate level based on this photometric output, even if the main subject is set at an appropriate level due to the flash from the strobe device, the secondary subject will be at the appropriate level from the metering device. Since the control is based on a signal with a lower luminance level than the original one, there is a problem of overexposure. That is, when average photometry is performed during backlight photography, the photometry value will be output darker than the actual background brightness due to the dark area. Therefore, if exposure is controlled based on this photometric value, the background will be overexposed. Also, when the brightness level of the ambient light is above a predetermined value, the aperture value is calculated according to the brightness level, and when it is less than the predetermined value, it is fixed at the predetermined aperture value, and the exposure control for the secondary subject is performed, and the flash is emitted. For example, a flash photography device that controls the amount of light emitted by a flash device based on the amount of light reflected from the main subject is disclosed in Japanese Patent Laid-Open No. 56-75627.
It is proposed in the publication. Problems to be Solved by the Invention This device automatically controls the aperture, which is convenient for beginners, but the intention of the photographer is to perform flash photography at a desired aperture value that takes into account the shooting distance and depth of field. I couldn't get a photo of it. This invention makes it possible to appropriately expose both the main subject and the background in backlit photography, and also enables flash photography to take into account the aperture that corresponds to the photographer's intention to create the image, as well as automatically controlling the aperture. It is an object of the present invention to provide a flash photography device that can perform the following functions. Means for Solving the Problems In order to achieve the above-mentioned object, the flash photography device of the present invention includes a photometry means for measuring subject brightness in a wide area of a photographing screen, and a photometry value determined based on the photometry value of the photometry means, a first aperture value output means that calculates and outputs an aperture value that is a predetermined amount smaller than the aperture value that provides exposure; and a predetermined aperture value for flash photography that is determined independently of the photometric value of the photometric device. a second aperture value output means for outputting a value; a determining means for determining whether the photometric value of the photometric means is higher than a predetermined level; When it is determined that the aperture value is lower than a predetermined level, the aperture value calculated by the first aperture value output means is selected, and when it is determined that the aperture value is lower than a predetermined level, a predetermined aperture value of the second aperture value output means is selected. a third aperture value output means for outputting a manually set aperture value; a first exposure control mode in which the aperture is automatically controlled according to the photometric value of the photometer; and an aperture to the manually set value. mode specifying means for selectively specifying a second exposure control mode in which the exposure control mode is controlled; and when the first exposure control mode is specified by the mode specifying means, the aperture value selected by the first selecting means a second selection means for selecting a set aperture value of the third aperture value output means when the second exposure control mode is selected; and an aperture value selected by the second selection means. an aperture determining means for determining the aperture aperture; a flash light metering means for measuring the light reflected from the subject that passes through the determined aperture and reflected from the film surface when the flash is fired; and an integral amount of the photometric value of the flash light metering means. The present invention is characterized by comprising a light emission stop signal output means that outputs a signal for stopping light emission of the flash light emitting device when a predetermined value is reached. Embodiment FIG. 1 is a block diagram showing the basic configuration of the present invention. LE is an interchangeable lens that is electrically connected to the camera body via four terminals JL ₁ to JL ₄ . Terminal JL ₁ is the terminal on the camera body to the right of the dashed line L.
When connected to JB ₁ , power +V _L is supplied from the camera body. Terminal JL ₂ is connected to terminal JB ₂ on the camera body, and the synchronization pulse CPL is sent from the camera body. The terminal JL ₃ is connected to the terminal JB ₃ to transfer focal length information and the like from the interchangeable lens LE to the camera body, and this information is input to the discrimination circuit DJ. Also, terminals JL ₄ and JB ₄ are terminals that share the ground between the lens LE and the camera body. FL is a flash light emitting device (hereinafter referred to as a strobe device). The terminal JF ₄ of this strobe device FL is
Connected to terminal JB ₈ on the camera body, strobe device
Make the ground common between the FL and the camera body. terminal
JF ₃ is connected to terminal JB ₇ on the camera body, and has an X contact.
A light emission start signal due to the closing of SX is input. Terminal JF ₂ is connected to terminal JB ₆ on the camera body, and outputs the flash photography mode signal from the strobe device FL.
This signal is input to the discrimination circuit DJ. This flash photography mode signal is transmitted, for example, when the power switch (not shown) of the strobe device FL is turned on, or when the main capacitor (not shown) of the strobe device FL is activated.
The output may be output when the charging voltage reaches a predetermined value. Terminal JF ₁ is connected with terminal JB ₅ ,
A light emission stop signal based on film surface photometry is input from the light emission control circuit FTT on the camera side, and the light emission of the strobe device FL is stopped. The above-mentioned light emission control circuit FTT has a circuit configuration as shown in FIG. 2, for example. In the figure,
The light-receiving terminal PD ₀ is a light-receiving element that receives reflected light from the film surface, and the light-receiving element PD ₀ , an operational amplifier OA ₁₀ , and a capacitor C ₁₀ constitute an integrating circuit. The analog switch _AS10 becomes non-conductive when the X contact SX is closed, and the output current of the light receiving element _PD0 can be integrated by the capacitor _C10 . In addition,
The diode _D10 is provided to prevent the high voltage from the strobe device FL from being applied to the camera side circuit via the X contact SX. It is also assumed that the analog switch AS ₁₀ has a circuit configuration such that it is conductive when the X contact SX is open. Constant voltage source CE ₁₀ outputs a signal corresponding to constant K ₁ E _v . The K ₁ E _v signal from the constant voltage source CE ₁₀ and the film sensitivity signal S _v from the film sensitivity signal output circuit SS described later are connected to the resistors R ₁₀ , R ₁₁ , R ₁₂ ,
R ₁₃ and an operational amplifier OA ₁₁ are input to a subtraction circuit, and a signal S _v −K ₁ is calculated. The comparison circuit CMP ₁ (FIG. 1) becomes "High" in the fill-in flash mode in which the strobe device is used as an auxiliary light source, and becomes "Low" in the mode in which the strobe device is used as the main light source. Therefore, fill-in
In the flash mode, the analog switch _AS12 is conductive and the signal Sv _{- K1} from the operational amplifier _OA11 is input to the base of the transistor _BT20 . on the other hand,
In the mode where the strobe device is the main light source, the output of the inverter IN ₅₀ becomes "High", the analog switch AS ₁₁ becomes conductive, and the signal S _v from the film sensitivity signal output circuit SS is transmitted to the transistor BT _20.
input to the base of The circuit consisting of transistors BT ₂₀ , BT ₂₁ and resistor R ₁₅ is a circuit that converts the signal S _v or S _v -K ₁ applied to the base of the transistor BT ₂₀ into a signal representing 2 ^Sv or 2 ^{Sv - K1} , respectively, This converted signal voltage is applied to the inverting input terminal of comparator _AC10 . The output of the operational amplifier OA ₁₀ is given to the non-inverting input terminal of the comparator AC ₁₀ . X contact SX
When the strobe device FL starts emitting light, the analog switch _AS10 becomes non-conductive. At this time, when the light reflected from the subject due to flash light emission passes through the photographing aperture of the camera, is reflected on the film surface, and enters the photodetector PD ₀ , the integral of the output current of the photodetector PD ₀ corresponding to the intensity of this incident light is calculated. is started. When the integrated potential by the capacitor C ₁₀ reaches the potential corresponding to the film sensitivity from the resistor R ₁₅ , the output of the comparator AC ₁₀ is inverted to "High" and a "High" pulse is output from the one-shot circuit OS ₅₀ . The pulse is sent as a light emission stop command to the strobe device FL via terminals JB ₅ and JF ₁ , and flash light emission is stopped. As a result, when the flash device FL _is in fill-in flash mode when _the subject brightness level is high,
When the luminance level of the subject is low and a strobe device is used as the main light source, the amount of light emitted is controlled so as to be under-exposed than the proper exposure. i.e. fill
In the -in flash mode, there is a considerable amount of exposure due to constant light from the main subject before the strobe device FL emits light, and the amount of light emitted by the strobe device is under-lit by the amount of exposure corresponding to this amount. The value of K ₁ mentioned above can be determined from the photometric map of the photodetector PD ₀ ,
This will depend on the ratio of the main subject to the entire shooting screen, the illumination characteristics of the strobe device, etc., but by shooting in many situations, we will experimentally determine the value that will cause the least number of failures, and then manufacture the camera. You can set this value at this point. Typically this value is e.g. 0K ₁
The value is around 1.5. The discrimination circuit DJ shown in FIG. 1 receives focal length information input from the interchangeable lens LE through terminals JL ₃ and JB ₃ and a flash photography mode signal input from the strobe device FL through terminals JF ₂ and JB ₆ . Based on this, one of the terminals d ₁ to _{d 4} is set to “High”. For example, when the distance of the interchangeable lens attached to the camera is 30 mm or less, set terminal d ₁ to "High" and set 31
When setting mm to 55mm, set terminal d ₂ to “High”, when setting from 56mm to
When it is 120mm, set terminal _d3 to "High", and when it is 121mm or more, set terminal _d4 to "High". FA ₁ to _{FA 4} are circuits that output aperture value signals for flash photography. For example, FA ₁ outputs a signal of _Av = 6 (F8), FA ₂ outputs a signal of Av = 5 (F5.6), FA ₃ is A _v = 4 (F4),
FA ₄ each outputs a signal of A _v =3 (F2.8).
FT ₁ to _{FT 4} are circuits that output exposure time signals that limit camera shake. For example, FT ₁ has T _v = 5 (1/30 sec).
FT ₂ outputs a signal of T _v = 6 (1/60sec), FT ₃
is T _v = 7 (1/125 sec), and FT ₄ is T _v = 8 (1/250 sec)
Outputs the signal. Note that the signal of T _v =8 from FT ₄ corresponds to the exposure time of the flash photography synchronization limit.
MP ₁₀ is a data selector, and terminal d ₁ of the discrimination circuit DJ
When becomes “High”, the signal from the signal output circuit FA ₁ is output to the data output terminal γ ₁ , and the signal from the signal output circuit FT ₁ is output to the data output terminal γ ₂ . terminal d ₂
When becomes “High”, the signal from FA ₂ is transferred to γ ₁ ,
The signal from FT ₂ is output to γ ₂ , and if d ₃ is “High”, the signals from FA ₃ and FT ₃ are output to γ ₁ and γ ₂ , respectively.
If d ₄ is "High", the signals from FA ₄ and FT ₄ are output to γ ₁ and γ ₂ , respectively. Therefore, in the above example,
If the focal length of the lens is 30mm or less, 1/30sec at F8
However, for 31mm to 55mm, 1/60sec at F5.6, but for 56mm to 120
For mm, 1/125sec at F4, for 121mm or more, 1/1 at F2.8
250 seconds are output as the aperture value and exposure time for flash photography, respectively. Table 1 shows the output signal of the data selector MP ₁₀ corresponding to the focal length of the lens.

[Table] AS is a set aperture value signal output circuit that outputs the set aperture value, and SEL is "High" when in the aperture priority exposure time automatic exposure control mode (hereinafter referred to as A mode), This is an exposure control mode signal output circuit that outputs a "Low" signal during a so-called program mode (hereinafter referred to as P mode) in which exposure time is automatically controlled. data selector
When the mode signal output circuit SEL outputs a "High" signal in A mode, the MP ₁₁ outputs a signal from the set aperture value signal output circuit AS, and the mode signal output circuit SEL outputs a "Low" signal in P mode. When the signal is output, a signal representing an aperture value for flash photography corresponding to the film sensitivity from an adder circuit ADD, which will be described later, is output. SS is a circuit that outputs a signal corresponding to the set film sensitivity S _v , and FXD is a circuit that outputs a signal corresponding to S _v =5 (ISO100). These two circuits
The signals from SS and FXD are input to the subtraction circuit SUB, where the calculation of S _v -5 = △S _v is performed, and the set film sensitivity and
The difference from the film sensitivity of ISO100 is calculated. The difference signal △S _v calculated by the subtraction circuit SUB and the aperture value signal from γ ₁ of the data selector MP ₁₀ are input to the adder circuit ADD to calculate A _vf5 + △S _v = A′ _vf . will be carried out. Here, the data selector
The aperture signal Avf ₅ from γ ₁ of MP ₁₀ is the aperture value corresponding to the commonly used film sensitivity ISO 100, and the addition circuit
The aperture value signal A′ _vf calculated by ADD becomes the aperture value corresponding to the set film sensitivity. The flash photography setting or the calculated aperture value A′ _vf signal from the data selector MP ₁₁ is sent to the arithmetic circuit.
Input to ALU ₁ . Further, a signal _Bv corresponding to the subject brightness information from the photometric signal output circuit BDO and a signal corresponding to the set film sensitivity _Sv from the set film sensitivity signal output circuit SS are input to this arithmetic circuit ALU ₁ . The calculation B _v +S _v +K ₂ -A′ _vf =T _va is performed to calculate the exposure time T _va . Note that the constant K ₂ E _v is determined by the arithmetic circuit as described later.
Set in ALU ₁ . Here, the above calculation results in underexposure by K ₂ E _v compared to the calculation for normal steady light, and this is due to the following reasons. Usually, fill-in flash photography is performed in a backlit situation, and the main subject in the center has lower luminance than the surrounding subordinate subjects. Since the photometry using the photodetector is usually center-weighted average photometry, the fill-in
In a state where flash photography is performed, the light receiving element is attracted by the low brightness of the main subject in the center and outputs a signal with lower brightness than the sub-subject. Therefore, if we perform the above calculation assuming that the secondary subject is brighter than the output of the photodetector by K ₂ E _v according to the photometric map of the photodetector, then the aperture value A′ _vf from the data selector MP ₁₁ will be calculated. Thus, the exposure time T _va is calculated so that the sub-subject is properly exposed. Then, if you fire the strobe device and control the flash amount with TTL, and control the shutter with the exposure time T _va mentioned above, the main subject will be properly exposed by the strobe device, while the sub-subject will be more exposed than the main subject. Since the sub-object is usually far away and in the vicinity of the photographic screen, proper exposure can be obtained using only constant light for the sub-subject, which the light from the strobe device does not reach. The value of K ₂ E _v is determined by collecting a large amount of data on the difference between the output of the average metering light receiving element and the brightness of the sub-subject at that time in situations where many fill-in flash shots are taken, and using this data. If a predetermined value that satisfies the above-mentioned exposure is determined based on the exposure value and this value is set at the time of camera manufacture, fill-in flash photography can be performed without failure in the majority of situations. CMP ₁ is the exposure time signal from the calculation circuit ALU ₁
This is a comparison circuit that compares T _va with the camera shake limit exposure time signal T _vh according to the focal length of the lens from γ ₂ of the data selector MP _10. When T _va < T _vh , T _va T If it is _vh , it outputs a “High” signal. On the other hand, CMP ₂ has the above exposure time T _va and the tuning limit exposure time T _vx from the exposure time signal output circuit FT ₄ .
This is a comparator circuit that compares T _va T _vx , outputs a “High” signal, and outputs a “Low” signal if T _va > T _vx . MP ₁₂ is a data selector that receives a signal T _va from the arithmetic circuit ALU ₁ , a signal T _vh from γ ₂ of the data selector MP ₁₀ , and a signal from the exposure time signal output circuit FT ₄ .
T _vx is input, and one of T _va , T _vh , and T _vx is output as an exposure time signal T _vf for flash photography according to the outputs of comparison circuits CMP ₁ and CMP ₂ . First, T _va ＜
T _vh , comparison circuit CMP ₁ is “Low”, CMP ₂
When the data selector MP 12 outputs a "High" signal, the data selector MP ₁₂ outputs the camera shake limit exposure time signal T _vh from the terminal γ ₂ of the data selector MP ₁₀ . Next, if T _vh T _va T _vx , the comparator circuit CMP ₁ ,
The outputs of both CMP ₂ become "High", and the data selector MP ₁₂ outputs the exposure time signal T _va from the arithmetic circuit ALU ₁ to properly expose the sub-object. Furthermore, when T _vx < T _va , the output of the comparison circuit CMP ₁ becomes "High" and the output of CMP ₂ becomes "Low", and the data selector MP ₁₂ selects the tuning limit exposure time from the exposure time signal circuit FT ₄ . Outputs the signal T _vx . The arithmetic circuit ALU ₂ inputs the subject brightness B _v from the photometry signal output circuit BDO, the set film sensitivity S _v from the set film sensitivity signal output circuit SS, and the exposure time T _vf from the data selector MP ₁₂ , and calculates B _v +S. The aperture value A _va at which the sub-subject is properly exposed is calculated by calculating _v + K ₂ −T _vf =A _va . This signal is the data selector
Applied to one input terminal of MP ₁₃ . The other input terminal of the data selector MP ₁₃ is given the aforementioned aperture value signal _A'vf from the data selector MP ₁₁ . When the signal from the comparator circuit CMP ₂ is "High" at T _va T _vx , the data selector MP ₁₃ controls the setting from the data selector MP ₁₁ or the aperture value A′ _vf corresponding to the focal length and film sensitivity. Aperture value A _vf
On the other hand, the comparator circuit CMP ₂ outputs T _va >
When a "Low" signal is output at T _vx , the aperture value A _va for fill-in flash from the arithmetic circuit ALU ₂ is output as the control aperture value A _vf . Here, the aperture value A _va is output from the data selector MP ₁₃ when the tuning limit exposure time is output from the data selector MP ₁₂ .
Since T _vx is output as control exposure time T _vf , the aperture value A _va calculated by the arithmetic circuit ALU ₂ and output for control is determined by B _v + S _v + K ₂ − T _vx = A _va This is the aperture value. The method of outputting the control aperture value A _vf and exposure time T _vf explained above can be summarized as follows. First, the camera shake limit exposure time depending on the focal length
The aperture value corresponding to T _vh , focal length, and film sensitivity, or the set aperture value A′ _vf is output for control purposes because the exposure calculated by B _v + S _v + K ₂ − A′ _vf = T _va This is the case when the time T _va satisfies T _va <T _vh , that is, B _v +S _v +K ₂ <T _vh =A′ _vf . Next, T _va found by the above calculation
and A′ _vf are output when T _vh T _va T _vx , that is, T _vh +A′ _vf B _v +S _v +K ₂ T _vx +A′ _vf . Furthermore, the tuning limit exposure time T _vx
The aperture value A _va found by B _v + S _v + K ₂ − T _vx = A _va is output for control when T _va > T _vx , that is, T _vx + A' _vf < B _v This is the case of +S _v +K ₂ . Furthermore, in the case of T _vh T _va , that is, T _vh +A′ _vf B _v +S _v +K ₂ , T _va or T _vx found based on A′ _vf
The A _va determined based on the value is output, and the exposure time T _va or aperture value A _va that makes the secondary subject also properly exposed is output.
is output and uses the strobe device as an auxiliary light source.
The mode is fill-in flash, and when T _vh > T _va , that is, T _vh + A' _vf > B _v + S _v + K ₂ , T _vh and A' _vf are output and a normal strobe device is used as the main light source. mode. this is,
The reason why it is necessary to use fill-in flash is because the subject is usually bright and the subject is backlit. The control exposure time signal T _vf from the data selector MP ₁₂ is sent to the shutter control circuit CT and output to the shutter control circuit CT _.
Exposure time control is performed in accordance with the moreover,
This T _vf is sent to the display section DPT and the exposure time is displayed. Further, the control aperture value signal A _vf from the data selector MP ₁₃ is sent to the aperture control circuit CA, and aperture control corresponding to A _vf is performed. Furthermore, this A _vf is sent to the display section DPA to display the aperture value. Arithmetic circuit ALU ₃ outputs subject brightness B _v from photometry signal output circuit BDO and setting film sensitivity signal output circuit.
Setting film sensitivity S _v from SS, data selector
Exposure time T _vf from MP ₁₂ , data selector MP ₁₃
Input the aperture value A _vf from , calculate B _v + S _v + K ₂ − T _vf + A _vf ) = △E _v , and the signal of this △E _v is displayed on the display DPD.
sent to. This △E _v becomes 0 when T _va or T _vx is output, that is, in fill-in flash mode, and when T _vh is output, that is, when a strobe device is used as the main light source. Displays how much the subject will be underexposed. Furthermore, the photographer should fill the screen when the display DPD reaches 0.
-in becomes flash mode, fill-in if not 0
You can confirm that it is not in flash mode. FIG. 3 is a block diagram showing the overall circuit configuration of a camera system to which the present invention is applied. Note that the thick line portion of the signal line is a signal line through which data of multiple bits is transferred. In FIG. 3, reference numeral 1 denotes a microcomputer or microprocessor (hereinafter referred to as .mu.-com) which sequentially controls the overall operation of this camera system and also performs exposure calculations. Power-on reset circuit PO ₁ generates a power-on reset signal when power battery BB is installed in the camera body.
PR ₁ is generated, and this signal PR ₁ is the reset terminal.
μ-com1 is reset by being applied to RE. The oscillation circuit OSC is a reference clock pulse.
This is a circuit that outputs CP, and this clock pulse is μ
The clock pulse CP is input to the clock input terminal CL of -com1 and each other block, and the circuit operations of the entire camera system shown in FIG. 3 are synchronized by this clock pulse CP. The display unit DP ₁ is composed of, for example, a time-divisionally driven liquid crystal, and is connected to the segment terminal of μ-com 1.
Displays exposure control values, exposure control mode, etc. based on signals from SEG and common terminal COM. The above μ-com1, oscillator OSC, display section
Power is supplied to DP ₁ , the interface circuit IF, strobe control circuit FC, data selector MP ₁ , inverters IN ₁ to IN ₆ , and AND circuit AN ₁ , which will be described later, from the power line +E that is directly connected to the power battery BB. . The switch MS is a photometry switch that is closed in conjunction with the photometry operation. When this switch MS is closed, a "High" signal is input to the input terminal ST of μ-com 1 via inverter IN ₂ , and μ -com1
starts reading data for exposure control. At the same time, the A-D conversion operation, exposure calculation, and display operation of the photometric output are started. In addition, the metering switch
When MS is closed, the power supply transistor _BT1 becomes conductive. Circuits other than those described above in the camera body are supplied with power from the power supply line +VB via the power supply transistor _BT1 . Furthermore, the reset signal PR ₂ is output from the power-on reset circuit PO ₂ by the start of power supply from the power supply line +VB, and this signal is transmitted to the exposure time control device CT, which will be described later.
It is input to the aperture control device CA, and these devices are each reset. Block 3 surrounded by a broken line is an exposure control section,
It consists of an exposure time controller CT, an aperture controller CA, and a pulse generator PG. The exposure time control device CT has an output terminal of μ-com1.
Calculated or set exposure time data from OP ₁
T _v is input. The exposure time controller CT generates a signal representing the time corresponding to this data _Tv (ie, the time 2 ^-Tv from opening to closing of the shutter) based on the clock pulse CP. This signal controls the exposure time. The aperture control device CA has μ
-Data _{ΔA v} representing the calculated or set number of narrowing down stages and pulses from the pulse generator PG are input from the output terminal OP2 of the -com1. The pulse generator PG outputs a number of pulses corresponding to the amount of rotation of an aperture ring (not shown) provided on the camera body side. The above aperture control device CA is a pulse generator
Count the number of pulses corresponding to the number of aperture stages of the lens LE due to the rotation of the aperture ring input from PG, and combine this count value with the data ΔA _v of the number of aperture stages from the output terminal OP ₂ of μ-com1. When the two match, the rotation of the aperture ring is stopped, and the aperture aperture is controlled in this way. Switch LS is a switch that detects whether the interchangeable lens LE is attached or not, and is closed when the interchangeable lens LE is attached to the camera body and locked, and opened when it is not attached. This attachment detection switch LS
Due to the closing of , a “High” signal is input to the input terminal i ₁ of μ-com1 via inverter IN ₁ , and μ
-com1 reads the data related to the attached lens LE and calculates the exposure time, and conversely, if the input terminal _i1 becomes “Low” due to the release of the attachment detection switch LS, the lens data is not read and will be explained later. perform other operations. In the figure, a block 5 surrounded by a broken line is a data output section that outputs data for exposure control, and includes a light receiving element PD ₁ for open average photometry, a variable voltage source VE ₁ for outputting a film sensitivity signal, and a diode D ₁ for logarithmic compression. and a photometric circuit ME consisting of an operational amplifier _OA1 , and an operational amplifier OA1, and an A-D
A conversion circuit AD, a set aperture value signal output device AS,
It consists of a set exposure time signal output device TS, a film sensitivity signal output circuit SS, and a mode signal output device MSO. The light receiving element PD ₁ is provided as shown in FIGS. 4 and 5. Note that FIG. 4 shows the state before the start of the exposure control operation, and FIG. 5 shows the state during exposure of the film FIL. In FIG. 4, the photographic aperture device APL is set to an open aperture, and the reflection mirror RM is lowered so as to guide light from the subject to the viewfinder optical system.
The object light that has passed through a half mirror section provided, for example, in the center of the reflecting mirror RM is reflected by the reflecting plate RL and enters the light receiving element PD ₁ via the condensing lens LEB. At this time, the photometric output of the operational amplifier OA ₁ in FIG. 3 is B _v +S _v -A _vp .
Here, B _v is the subject brightness, A _v0 is the open aperture, and S _v is the apex value depending on the film sensitivity. In Fig. 5, the photographing aperture APL is controlled based on a signal representing the set or calculated aperture value _Av , and the photographing aperture APL is controlled based on the signal representing the set or calculated aperture value Av, and the reflecting mirror RM and the reflecting plate
RL is retracted outside the photographing optical path. The shutter SHT is then opened, and the lens
The light that passes through LE and photographic aperture APL and is reflected by film surface FIL enters light receiving element PD ₁ via condensing lens LEB. At this time, the above operational amplifier
The output of OA ₁ is B _v + S _v - A _v . Based on the output of the operational amplifier _OA1 , the light emission amount of the strobe device FL is controlled as described later. The A-D converter AD is the output terminal O ₇ of μ-com1.
When a "High" pulse is output from the operational amplifier _OA1 , the analog photometric signal _Bv + _Sv - _Avp from the operational amplifier OA1 is converted into a digital signal based on the clock pulse CP. This A-D converted data B _v
+S _v −A _vp is the input terminal IP ₂ of data selector MP ₁
given to. The set aperture value signal output device AS outputs data A _vs −A _vp corresponding to the setting position of the aperture setting ring (not shown) of the lens LE to the input terminal IP ₃ of the data selector MP ₁ .
Output to. The set exposure time signal output device TS outputs digital data corresponding to an exposure time manually set by an exposure time setting member (not shown) of the camera body. The output terminal of this output device TS is connected to the input terminal IP ₄ of the data selector MP ₁ . The film sensitivity signal output device SS outputs digital data corresponding to the film sensitivity manually set by a film sensitivity setting member (not shown) of the camera body. The output terminal of this output device SS is connected to the input terminal IP ₅ of the data selector MP ₁ . The mode signal output device MSO outputs digital data corresponding to an exposure control mode manually set by a mode setting member (not shown) of the camera body. The output terminal of this output device MSO is connected to the input terminal IP ₆ of the data selector MP ₁ . The interface circuit IF sequentially reads various data from the interchangeable lens LE when the output terminal O ₆ of the μ-com 1 becomes “High”. When the reading of various data from the interchangeable lens LE is completed, this interface circuit IF connects the μ-com
The lens data sequentially read as described above according to the 4-bit data from the output terminal OP ₃ of 1 is input to the μ-com 1 via the data selector MP ₁ and the external data bus DB of the μ-com 1. . In addition,
A specific example of the interface circuit IF is shown in FIG. 14, and its detailed operation will be described later. The strobe control circuit FC receives signals input from control terminals O ₅ , O ₈ , O ₉ , O ₁₀ , O ₁₁ of μ-com1,
Data is exchanged with the strobe device FL based on the signal input from the inverter _IN2 . The detailed configuration and operation of this control circuit FC are as follows.
This will be described later with reference to FIGS. 12 and 13. Data selector MP ₁ is the output terminal of μ-com1
Based on the 4-bit data given from OP ₃ to the selection terminal SL, the data input to input terminals IP ₁ to IP ₇ is sent to the μ-com via the data bus DB.
Enter 1. The data given to the selection terminal SL of this data selector MP ₁ and the data selector
Table 2 shows the relationship with the data output from MP ₁ to the data bus DB.

[Table] As shown in Table 2 above, if the data of output terminal OP ₃ is “0 _H ”, the set exposure time data T _vs from input terminal IP ₄ is “1 _H ”, the film from IP ₅ is If the sensitivity data S _v is " _2H ", it will be the exposure control mode data from IP ₆ , if it is " _3H " it will be the photometric value data from IP ₂ , and if it is " _4H " it will be the strobe data from IP ₇ . If “5 _H ”, the number of filtering steps from IP ₃ is A _vs −
The data of each A _vp is taken into μ-com1 via the data bus DB. Also, output terminal OP ₃
When the data is " _6H " to " _DH ", the data from the interface circuit IF is input to the input terminal _IP1 of the data selector _MP1 . Note that the interface circuit IF outputs the data shown in Table 3, which will be described later, read from the lens side circuit LEC according to the data from "6 _H " to "D _H " input from the output terminal OP ₃ , respectively. Output to IP ₁ .
In addition, in μ-com1, the lens installation switch
When LS is not closed and input terminal i ₁ is “Low”, only data from “O _H ” to “4 _H ” is output from output terminal OP ₃ , and data related to lens LE is output from μ-com 1. is not loaded. The switch RS is closed when a release button (not shown) is pressed, and is opened when the release button is released. The switch CS closes when winding is completed, and opens when the exposure control operation is completed to prevent accidental exposure. A signal from the release switch RS is input to one input terminal of the AND circuit _AN1 via an inverter _IN4 . The signal from the accidental exposure prevention switch CS is inputted to the other input terminal of the AND circuit _AN1 via the inverter _IN5 , and is also inputted to the input terminal _i2 of the μ-com1. Further, the output terminal of the AND circuit _AN1 is connected to the interrupt terminal it of μ-com1. The output terminal _O5 of μ-com1 is “High” when starting the exposure control operation.
This "High" signal causes the release circuit RL connected to the terminal _O5 to perform the release operation of the exposure control mechanism. Further, the output terminal _O5 of μ-com1 is connected to the input terminal of an inverter _IN3 , and the output of this inverter _IN3 is connected to the base of the power supply transistor _BT1 via a resistor. With this configuration, even if the photometry switch MS is opened during the exposure control operation, the transistor _BT1 is maintained in a conductive state. The output terminal _O6 of μ-com1 becomes “High” while the interface circuit IF reads data from the lens LE side. This terminal O ₆ is connected to the input terminal of an inverter IN ₆ , and the output terminal of this inverter IN ₆ is connected to the base of the power supply transistor BT ₂ via a resistor. With this configuration, when terminal O ₆ becomes “High”, the output of inverter IN ₆ becomes “Low” and the transistor
BT ₂ is conductive, and power is supplied from the power line +VB to the circuit LEC on the lens LE side via the power line +VL, the terminal JB ₁ on the camera body side, and the terminal JL ₁ on the lens side. The circuit LEC on the lens LE side has a built-in ROMRO (described later) that permanently stores various lens data. Clock pulse output from the interface circuit IF on the camera body side
CPL is input to the lens side circuit LEC via terminal JB ₂ on the camera body side and terminal JL ₂ on the lens side.
Using this clock pulse CPL as a synchronization signal, the address signal and data signal of ROMRO ₁ are transmitted between the interface circuit IF and the lens side circuit LEC to the signal line SB, the terminal JB ₃ on the camera body side,
They are delivered alternately via terminal JL ₃ on the lens side. FIG. 6 is a flowchart showing the operation of μ-com 1 in FIG. 3. The operation of the camera system according to the embodiment shown in FIG. 3 will be explained below based on the flowchart shown in FIG. 6. Normally, the clock CP is not inputted to the μ-com 1 from the outside, so that it is inactive and has low power consumption. When the photometric switch MS is closed and a "High" signal is input to the start terminal ST, the μ-com 1 starts operating from a specific address. Further, when the output of the inverter _IN2 becomes "High", a command signal is sent from the strobe control circuit FC to start the operation of the booster circuit of the strobe device FL, and the booster circuit starts operating. In step #1, it is determined whether the photometric switch MS is closed and the start terminal ST becomes "High". When the photometry switch MS is open and the start terminal ST is “Low”,
The process moves to step #2, and the operations from step #2 to step #6 are performed. This operation will be described in detail later. On the other hand, if it is determined that the start terminal ST is "High", the process moves to step #7 and the timer register TR is reset. This timer register TR will be described in detail later. Next, in step #8, switch on the lens attachment switch.
It is determined whether LS is closed and the input terminal _i1 is set to "High". If the input terminal _i1 is "Low", it immediately moves to step #10, and if the input terminal _i1 is "High", it moves to step #9 and sets the output terminal _O6 of μ-com1 to "High". ”, conducts transistor BT ₂ through inverter IN ₆ , and connects the circuit LEC on the lens LE side.
At the same time, the interface circuit IF starts reading data from the lens LE, and moves to step #10. In step #10, output terminal _O9 of μ-com1 is set to “High”
Then, the strobe control circuit FC starts reading data from the strobe device FL, and in step #11, a "High" pulse is output from the terminal _O7 . In this way, a pulse for operation command of the A-D converter AD is given, and the operational amplifier OA ₁
A-to-D conversion of the photometric output output from is started. Next, in step #12, μ-com1
4-bit data "O" is set in the data register DR in the memory, and this data is output to the output terminal _OP3 . At this time, as shown in Table 2 above, the exposure time data T _vs inputted to the input terminal IP ₄ is output from the data selector MP ₁ , and this data is sent to a predetermined location in μ-com 1 via the data bus DB. loaded into a register. Then, in step #15, "1" is added to the contents of the data selector DR. Then, in step #16, it is determined whether the contents of the data register DR have reached " _5H ". This data register DR
If the content has not become "5 _H ", return to step #13 and repeat the same operation. In this way, data from data selector _MP1 is read into μ-com1 until the content of data register DR becomes "5". If the content of data register DR is “1 _H ”, film sensitivity data
S _v is read, and if “2 _H ”, exposure control mode data is read. Here, the A-D conversion is started by the pulse output from the terminal _O7 in step #11, and the A-D conversion ends when the content of the data register DR reaches " _3H ". , it is assumed that data B _v +S _v -A _vp representing the brightness of the subject is input to the input terminal IP ₂ of the data selector MP ₁ . And this data B _v + S _v + A _vp is
It is input into a predetermined register. After that, in the same manner as described above, when the content of the data selector DR becomes " _4H ", the strobe device FL
The data input to the input terminal IP ₇ of the data selector MP ₁ via the strobe controller FC from μ
-Input to com1. Then, when the program moves to step #16, the contents of the data register DR are " _5H ", so the program moves to step #17, where the terminal _O9 is set to "Low" and the strobe control circuit FC is set to "Low". It is determined to be inactive and moves to step #18. In step #18, the state of input terminal _i1 is determined. When the mounting switch LS is not closed and therefore the output of the inverter IN ₁ is “Low”, step #29 is executed as described in detail below.
In the subsequent steps, exposure calculations are performed when the interchangeable lens LE is not attached. #18
In step #19, if it is determined that the interchangeable lens LE is attached to the camera and therefore the input terminal _i1 is "High", the process moves to steps #19 and subsequent steps. In step #19, data "5 _H " is sent from the data register DR to the output terminal OP ₃ , and based on this data "5 _H ", data representing the number of set refinement stages is input to the input terminal IP ₃ of the data selector MP _1. A _vs −A _vp is sent to the data bus DB. Then, in step #20, the data A _vs -A _vp is read out and stored in a predetermined register. Thereafter, "1" is added to the contents of the data register DR, and the process moves to step #22. In step #22, it waits for the signal applied from the interface circuit IF to the input terminal _i3 of μ-com1 to become "High". That is, at the time when the transfer of all data from the lens side circuit LEC to the interface circuit IF is completed, the interface circuit IF sends a "High" signal to the input terminal _i3 of the μ-com1. As mentioned above, when the input terminal _i3 of μ-com1 becomes "High", the process moves to step #23.
In this step #23, the output terminal O ₆ becomes "Low", this "Low" signal is inverted by the inverter IN ₆ and becomes "High", and this "High" signal is applied to the base of the power supply transistor BT ₂ . is applied, and the transistor BT ₂ becomes non-conductive. Therefore, the power supply from the power supply line +VL to the circuit LEC on the lens side is stopped. Thereafter, in the steps after step #24, reading of data from the interface circuit IF to μ-com1 starts. In step #22, the input terminal of μ-com1
When _i3 becomes "High", the data fetched into the interface circuit IF is sequentially fetched into the μ-com1 in step #24. In this case, from the output terminal OP ₃ of μ-com1, the μ-com1
Signals "6 _H " to "D _H " indicating which data is to be taken into the data bus DB of the com1 are applied to the data selector _MP1 and the interface circuit IF. If the signal output from the output terminal OP ₃ is "6 _H ", it is the check data, if it is "7 _H ", it is the open aperture value data A _vp , if it is "8 _H ", it is the maximum aperture value data A _vn ,
“9 _H ” is the shortest focal length data fw, “A _H ” is the longest focal length data ft, “B _H ” is the D _V ∞ data described later, “C _H ” is the set shooting distance data D _V , “D _H ”
Then, the set focal length data fs is input from the interface circuit IF to the input terminal IP ₁ of the data selector MP ₁ . Further, these data are sequentially output from the data selector MP ₁ to the data bus DB. In this way, μ−
com1 is the data bus from data selector MP ₁
Repeat the operation of importing the various data described above via the DB. When the μ-com 1 completes taking in all the data described above from the interface circuit IF, it is determined in step #27 that the content of the data register DR is "E _H ", and then the next step #27 is performed. Move to step 28. In step #28, the lens side circuit LEC
from μ-com1 via the interface circuit IF
Among the data imported into the camera, it is determined whether check data, which is always input when the interchangeable lens LE is attached to the camera, has been input. This check data is the first data sent from the lens side circuit LEC to μ-com 1, and is the same data for any lens. If it is determined that this check data has been input, μ-com 1 moves to steps #35 and below, while if this check data has not been input, it moves to steps starting from #29. This check data is not input when the interchangeable lens LE is not attached to the camera, or when camera accessories such as an intermediate ring or bellows are attached between the lens and the camera body. Equivalent to. Next, the operations in steps after step #29 in a state where the interchangeable lens LE is not attached to the camera body or the check data is not input will be described. In step #29, it is determined whether a flash photography mode signal is input to the camera body, for example, whether a strobe device FL is attached to the camera. To do this, as will be described later, when the strobe device FL is not attached to the camera, all data input to the terminal JB ₆ of the camera body is set to "Low". In this way, a “High” signal is applied to the above terminal JB ₆ .
If any input is made, the strobe attachment FL is attached to the camera. That is, it is determined that the flash photography mode signal is input to the camera body. When it is determined that the strobe device FL is not attached, the process moves to step #31.
Performs calculations for shooting with constant light. It is now assumed that an exposure control mode setting device (not shown) has set one of the automatic exposure control modes among program mode, aperture-priority exposure time automatic control mode, and exposure time-priority automatic aperture control mode. In other words, it is assumed that the photographer desires automatic exposure to be appropriate. At this time, the photometry circuit
The output of the ME is _Bv − _Avo . Here, A _vo is the effective aperture value. Next, according to the following formula, the exposure time T _vc
is calculated. (B _v − A _vo ) + S _v = T _vc Exposure time T _vc calculated according to the above formula
Based on this, the shutter speed of the shutter SHT is controlled. In this case, the number of aperture steps ΔA _v is 0, the photographic aperture device APL does not aperture the aperture, and the exposure time is automatically controlled using the TTL aperture metering method. Note that in the manual setting mode, the exposure time is controlled by a manually set value, the number of stops is set to 0, and the photographing aperture device APL does not stop down. On the other hand, if it is determined in step #29 that a strobe is attached, the process moves to step #30 and calculations for performing strobe photography are performed. In this case, the number of refinement stages ΔA _vf is set to 0.
The exposure time T _vf is set to an exposure time corresponding to the tuning limit (for example, 1/250 sec) when any automatic exposure control mode is set. Note that when the manual exposure control mode is set and the set exposure time T _vs is shorter than the time corresponding to the tuning limit, the exposure time corresponding to the tuning limit is determined as the control exposure time T _vf . Also,
When the set exposure time T _vs is longer than the time corresponding to the tuning limit, the set exposure time T _vs is determined as the exposure time T _vf for flash photography. Next, the exposure calculation for ambient light photography in step #31 described above is performed, and the process moves to step #32. In step #32, the strobe device is activated based on the data input from the strobe device FL.
It is determined whether a signal to be described later indicating that the charging voltage of a main capacitor (not shown) in the FL has reached a predetermined value is input. If it is determined that a signal indicating that the charge voltage of the main capacitor has reached a predetermined value is input, the process moves to step #33, and a display is made to indicate that strobe photography will be performed in the camera.
On the other hand, if the charging pressure of the main capacitor has not reached the predetermined value, the process moves to step #34, and a message indicating that steady light photography is to be performed in the camera is displayed. If it is determined in step #28 that check data has been input, the process moves to step #35. Then, in step #35, it is determined whether or not the strobe device FL is attached. When it is determined that the strobe device FL is attached, as will be described later, calculations for performing strobe photography are performed in step #36, and the process moves to step #37. On the other hand, if it is determined that the strobe device FL is not attached, the process moves to step #37, and the following calculations are performed to perform steady light photography. (B _v + S _v − A _vp ) + A _vp = E _v ...(1) Next, depending on what kind of exposure control mode is set in the exposure control mode setting device (not shown) of the camera, the following Perform calculations. First, in the program mode (hereinafter referred to as P mode), the following calculation is performed: p·E _v =A _v (0<p<1) (2). When A _vp ≦A _vc ≦A _vn (A _vp : open aperture value, A _vn : maximum aperture value), use this calculated aperture value as the aperture control value for constant light photography A _vc , and E _v −A _v = T _v ......(3) is calculated, and this exposure time is set as the exposure time control value T _vc for constant light photography. In addition, when A _vp is A _v <, the control value A _vc of A _vp is calculated as E _v −A _vp = T _v ……(4), and this calculated exposure time is T _v < T _vnio
In this case, an under warning is issued by setting T _vnio (maximum exposure time) as _the control value T _vc . When T _v ≧T _vnio , T _v calculated by equation (4) is set as the control value T _vc .
Furthermore, when the aperture value A _v calculated by equation (2) is A _v > _vn , A _vn is set as the control value A _vc , and the calculation of E _v − A _vn = T _v ……(5) is performed, and T When _v > T _vnax (T _vnax ; shortest exposure time), an over warning is given and
Let T _vnax be the control value T _vc . On the other hand, when T _v <T _vnax , T _v calculated by equation (5) is set as the control value T _vc . In the aperture-priority automatic exposure time control mode (hereinafter referred to as A mode), find the set aperture value A _vs by (A _vs −A _vp ) + A _vp = A _vs ... (6), then E _v −A _vs =T _v ……(7) is performed to calculate the exposure time. Then, when T _vnio ≦T _v ≦T _vnax , set aperture value
The control value is A _vs and the exposure time T _v calculated by equation (7).
Let A _vc and T _vc be. On the other hand, when T _v < T _vnio , T _vnio
As the control value T _vc , calculate E _v −T _vnio = A _v ...(8), and when A _v ≥ A _vnio , set the aperture value calculated by equation (8) as the control value A _vc . . Also, A _v ＜
When A _vnio, an under warning is issued using A _vnio as the control value A _vc . Furthermore, the exposure time T _v calculated by equation (7) is T _v >
When T _vnax , then the following calculation is performed using T _vnax as the control value T _vc : E _v −T _vnax = A _v (9). And when A _v > A _vn , A _vn
While issuing an over warning as the control value A _vc ,
When A _v ≦A _vn , the aperture value A _v calculated by equation (9) is set as the control aperture value A _vc . When in exposure time priority automatic aperture control mode (hereinafter referred to as S mode), calculate E _v −T _vs = A _v ...(10), and set when A _vp ≦A _v ≦A _vn . Let the exposure time T _vs and the aperture value A _v calculated by equation (10) be control values A _vc and T _vc . When A _v <A _vp , A _vp is set as the control value A _vc , and the following calculation is performed: E _v −A _vp = T _v (11). When T _v ≧T _vnio , T _v calculated by equation (11) is set as the control value T _vc , and when T _v < T _vnio , T _vnio is set as the control value and an under warning is issued. On the other hand, A _v calculated by equation (10) is A _v >
When A _vn , use A _vn as the control value A _vc and perform the calculation E _v −A _vn (= A _vc ) = T _v ...(12), and when T _v > T _vnax ,
An over warning is given using T _vnax as the control value T _vc .
Furthermore, when T _v <T _vnax , T _v calculated by equation (12) is set as the control value T _vc . In the manual setting mode (hereinafter referred to as M mode), the set A _vs and T _vs are set as the control values A _vc and T _vc , and then E _v − (A _vc + T _vc ) = △E _v ……( 13) Calculate. At step #37, when the calculations for any of the above setting modes are completed, the following calculation is performed: A _vc -A _vp =ΔA _vc (14), and the process moves to step #38. In this way, when it is determined in step #35 that a strobe is attached, calculations for strobe photography are performed in step #36, and then the above-mentioned calculations for constant light photography are performed in step #37. Do this step by step and move on to step #38. Next, the calculation contents of step #36 will be explained based on the graphs of FIGS. 7, 8, and 9 and the flowcharts of FIGS. 10 and 11. Figure 7 shows the flash output control mode (hereinafter referred to as TTL mode) using TTL metering on the camera side of the strobe device FL.
It shows the relationship between the aperture value for exposure control and the exposure time when the camera body side is in P mode. The operation in the TTL mode and the P mode will be explained based on the flowchart of FIG. 10 while referring to this graph. In step #101, the following calculation is performed: (B _v − A _vp ) + S _v + A _vp = E _v (15), and then in step #102, the settings are made on the strobe side based on the data from the strobe. mode, TTL mode, or external light mode. Then, if the mode is TTL mode, the process moves to step #103, and if it is the external light mode, the process moves to step #201 in FIG. Next, in step #103, it is determined whether the camera side is in P mode or not. If it is in P mode, the process moves to step #104, and if not in P mode, the process moves to step #150. In step #104, it is determined whether the focal length of the interchangeable lens LE attached to the camera body is 30 mm or less, and if it is 30 mm or less, the aperture value A _vf5 corresponding to film sensitivity S _v = 5 is set to 6 (F8 ) (7th
Figure _W1 ). Then, in #106, the tuning exposure time T _vf is set to 5 (1/30 sec) (W ₁ in Fig. 7). #107 when the focal length is longer than 30mm
Determine whether it is within the range of 31mm to 55mm using the steps below. When it is within this range, A _vf5 is set to 5 (F5.6) (W ₂ in Figure 7), and T _vf is set to 6 (1/60 sec) (W ₂ in Figure 7). If the focal length is not within the range of 31mm to 55mm, then in step #110 it is determined whether the focal length is within the range of 56mm to 120mm, and if it is within this range, A _vf5 = 4.
(F4), T _vf = 7 (1/125 sec) (T ₁ in Fig. 7), and if the focal length is 121 mm or more, move to step #113 and set A _vf5 = 3 (F2.8), T _vf = 8 (11/250sec)
(T ₂ in Fig. 7) and proceed to step #115. In step #115, the calculation S _v -5=△S _v (16) is performed, and in the step #116, the calculation A _vf5 +△S _v =A _vf (17) is performed. In this way, if the film sensitivity changes, for example to the high sensitivity side, by determining A _vf , the amount of light incident on the film due to the appropriate strobe light will be small, so the aperture can be adjusted within a fixed strobe interlocking range as much as possible. You can narrow it down. Therefore, the depth of focus can be made as deep as possible during strobe photography. In addition, if the film sensitivity deviates from S _v = 5,
The aperture is narrowed down by the value of the deviation △S _v , so
The strobe linkage range does not change. In step #117, it is determined whether A _vf obtained based on equation (17) in step #116 satisfies A _vf < A _vp , and if A _vf < A _vp , step #118 is performed. Let A _vp be the aperture value for flash photography, A _vf .
If it is determined in step #117 that A _vp ≦A _vf , then in step #119 it is determined whether A _vn <A _vf . Then, if A _vn < A _vf , set A _vn to A _vf , and if A _vn ≧ A _vf , proceed to step #121 using A _vf calculated in step #116 as it is as the aperture value for flash photography. . In step #121, it is determined whether A _vf +T _vf ≧E _v +1 ...(18).If the formula (18) is satisfied, proceed to step #131, and if it is not satisfied. Then move to step #122. The value of E _v corresponding to this switching point is E _v
=10. Then, as shown in Figure 7, E _v
If <10, A _vf and T _vf remain at the values determined as described above and proceed to step #131. on the other hand,
When E _v ≧10, as shown in Fig. 7, after calculating A _vf and T _vf corresponding to E _v by the method described later,
Move to step #131. In step #122, the following calculation is performed: E _v +1-A _vf =T _va (19), and in step #123, it is determined whether T _va >8. Then, when T _va ≦8, in step #130, T _va obtained by equation (19) is set as the control exposure time T _vf , and the process moves to step #131. In the example of Figure 7, if W ₁ , then 10≦E _v
13, W ₂ corresponds to the range 10≦E _v ≦12, and T ₁ corresponds to the range 10≦E _v ≦11. On the other hand, T _va >8
In this case, set 8 (1/250sec) in step #124.
As T _vf , the following calculation is performed: E _v +1−T _vf =A _va (20). And if A _va ≦ A _vn (20)
A _va calculated by the formula is the aperture value for flash photography A _vf
As such, move to step #131. On the other hand, A _va
>A _vn , the display device OE in Figure 3 gives an over warning and sets A _vn to the control aperture value A _vf as #131.
Move on to the next step. If the part corresponding to steps #124 to #129 is _W1 in Figure 7, then
E _v ≧13, if W ₃ then E _v ≧12, if T ₁ then E _v ≧11, if T ₂
Corresponds to the area where E _v ≧10. In the above explanation, based on the value of E _v +1
A _va and T _va are calculated using the value of k ₂ explained in FIG. 1 as 1E _v .
In this example, k ₂ is set to 1E _v , but it may be determined to be an appropriate value within the range of 0E _v to 2E _v . Next, the exposure calculation operation in S mode will be explained with reference to FIG. In Figure 8, the solid line is T _vs = 3
(1/8sec), the dashed line indicates T _vs = 6 (1/60
sec), the dashed line shows T _vs = 8 (1/250
sec) is set. In FIG. 10, if it is determined in step #103 that the mode is not P mode, then in step #150 it is determined whether the mode is S mode. Then, in the S mode, it is determined in step #151 whether T _vs ≦8. When T _vs ≦8, T _vs is set as the control exposure time T _vf and the process moves to step #154. on the other hand,
When T _vs > 8, set T _vf to 8 in step #153 and move on to step #154. In step #154, the following calculation is performed: _Ev +1- _Tvf = _Ava (21) to calculate the control aperture value _Ava . If _Ava <A _vp in step #155, the process moves to step #156, and if _Ava ≧A _vp , the process moves to step #158. If A _va calculated based on formula (21) in step #155 is A _va <A _vp , A _vp is determined as the control aperture value A _vf in step #156, as shown in Fig. 3. After issuing an under warning on the display device UE, the process moves to step #131. In the example shown in FIG. 8, this means that E v <3 for the solid line and E _v <3 for the broken line, respectively.
In the case of E _v <6, the one-dot chain line corresponds to the region of E _v <8. If it is determined in step #155 that _Ava ≧A _vp , the process moves to step #158. And #158
In step , it is determined whether A _va >A _vn . When it is determined that A _va ≦ A _vn , in step #165, the aperture value A _va calculated by equation (21) is determined as the control aperture value A _vf , and
Move to step #131. This operation is the 8th
The process is carried out in the region of 3≦E _v ≦11 when shown by the solid line in the figure, 6≦E _v ≦14 when shown by the broken line, and 8≦E _v ≦16 when shown by the dashed line. On the other hand, if it is determined in step #158 that _Ava > A _vn , then in step #159,
A _vn is set as the control aperture value A _vf , and in step #160, the following calculation is performed: E _v +1 - A _vf = T _va (22). Thereafter, in step #161, it is determined whether T _va >8. When T _va ≦8, the process moves to step #162, and in this step #162, T _va calculated by equation (22)
is set as the control exposure time T _vf , and then the process moves to step #131. This is the 8th
The region shown by a solid line in the figure corresponds to 11≦E _v ≦16, and the case shown by a broken line corresponds to a region 14≦E _v ≦16. Note that in the case indicated by a dashed-dotted line, the corresponding area does not exist. On the other hand, if T _va > 8, the process moves to step #163. In this step #163, the control exposure time T _vf is set to 8 (=1/250 sec), and the display device OE shown in FIG. Gives an over warning. After that, move on to step #131.
This means that in the case shown in Figure 8, E _v >
This corresponds to 16 areas. Next, the calculation operation in the A mode will be explained with reference to the graph of FIG. 9 and the flowchart of FIG. 11. As mentioned above, in step #150,
If it is determined that it is not in S mode, step #170
In this step, it is determined whether the mode is A mode or not. If it is determined that the mode is A mode, the process moves to step #171, and in this step #171, it is determined whether the focal length of the lens in question is 30 mm or less. If it is 30mm or less, move to step #172 and set the exposure time T _vf , which represents the control target value, to 5 (1/
30 seconds). On the other hand, if the focal length of the lens is longer than 30 mm, the process moves to step #173, where it is determined whether the focal length of the lens is within the range of 31 mm to 55 mm. If the size is within this range, move to step #174 and increase the exposure time T _vf to 6
(1/60sec). If the focal length of the lens is not within the range of 31 mm to 55 mm, the process moves to step #175, and in step #175, it is determined whether the focal length of the lens is within the range of 56 mm to 120 mm. Make a determination. When the size is within this range, the process moves to step #176 and the exposure time T _vf is set to 7 (1/125 sec). On the other hand, the focal length of the lens is 56mm to 120mm
If it is determined that the size is not within the range, the process moves to step #177 and the exposure time T _vf is set to 8 (1/250sec)
It is determined that After performing the above-described operations, in step #178, it is determined whether the following is satisfied: A _vs +T _vf ≧E _v +1 (23). When formula (23) is satisfied, the aperture value A _vs set in step #179 is changed to the control target aperture value A _vf
, and move on to step #131. In the example shown in FIG. 9, this operation is performed when E _v ≦9 in the case of W ₁ , E _v ≦10 in the case of W ₂ , E _v ≦11 in the case of T ₁ , In the case of T ₂ , E _v ≦12. On the other hand, if it is determined in step #178 that equation (23) is not satisfied, the process moves to step #180, and in this step #180, the calculation of E _v + 1 - A _vs = T _va ... (24) Do this. Thereafter, in step #181, it is determined whether T _va >8. In step #181, if it is determined that T _va ≦, the process moves to step #188 and the (24th)
The exposure time _Tva calculated according to the formula is set as the control target value, and then the process moves to step #131.
The region in which the above operation is performed is 9<E _v ≦12 in W ₁ in FIG. 9, and 10<E _v ≦ in W _2.
12, in the region of 11<E _v ≦12 at T ₁ .
Note that at _T2 , there is no region in which the above operation is performed. If it is determined in step #181 that T _va >8, the process moves to step #182, where the exposure time T _vf is set to 8. Then move to step #183 and this step #183
Then, the following calculation is performed: E _v +1−T _vf =A _va (25). And in step #184,
It is determined whether the above calculated A _va is A _va >A _vn . When A _va ≦A _vn , in step #187, the value A _va calculated by equation (25) is determined as the control target aperture value A _vf , and the process moves to step #131. The above operation is 12<E _v ≦16 in FIG.
It is carried out in the area of On the other hand, when A _va > A _vn , in step #185, A _vn is determined as the control aperture value A _vf ,
Thereafter, in step #186, an overload warning is issued by the display device OE shown in FIG. 3, and the process moves to the next step #131. If it is determined in step #170 that the mode is not A mode, the process moves to step #190 and subsequent steps corresponding to M mode. In step #190, it is determined whether T _vs ≦8. When T _vs > 8, set T _vf as 8,
When T _vs ≦8, T _vs is defined as T _vf , and the following #193
In step #131 of FIG. 10, A _vs is determined as A _vf . If it is determined in step #102 in Figure 10 that the strobe mode is not TTL, it means that the external light mode is set to the strobe device FL, and the first
Move to steps after #201 in Figure 1. In step #201, it is determined whether the exposure control mode on the camera side is M mode. When the mode is M, the process moves to step #202 and it is determined whether the set exposure time T _vs >8. T _vs ＞
8, the control exposure time T _vf representing the control target value is set to 8, and when T _vs ≦8, the control exposure time T _vf is set to the above T _vs. Next, in step #205, the control aperture value A _vf is determined to be the set aperture value A _vs , and the process proceeds to step #131 described above. On the other hand, if it is determined in step #201 that the camera is not in M mode, regardless of whether the exposure control mode of the camera device is P, A, or S, the process moves to step #206 and the lens LE It is determined whether the focal length is 30mm or less. When the focal length of the interchangeable lens LE attached to the camera device is 30 mm or less, the control exposure time T _vf is 5.
, and move on to step #213. In step #206, the focal length of the above lens LE is 30mm.
If it is determined that the focal length is longer than , then in step #208 it is determined whether the focal length is within the range of 31 mm to 55 mm. When the focal length of the lens LE is within the range of 31 mm to 55 mm, the control exposure time T _vf is set to 6, and the process moves to step #213. On the other hand, if it is determined in step #208 that the focal length of the lens LE is not within the range of 31 mm to 55 mm, the process moves to step #210, and the focal length of the lens LE is determined to be within the range of 56 mm to 120 mm. A determination is made as to whether the size is the same. When the focal length is within the range of 56 mm to 120 mm, the control exposure time T _vf is set to 7, and the process moves to step #213. Similarly,
If it is determined in step #210 that the focal length of the lens LE is not within the range of 56 mm to 120 mm, the control exposure time T vf is determined to be 8 in step #212, and the control exposure time T _vf is determined to be 8 in step #213. Move to step. In step #213, the strobe device FL
A _vf data is obtained based on the data input from , and it is determined in step #214 whether A _vf <A _vp . When A _vf <A _vp , the control aperture value A _vf is determined to be A _vp , and the process moves to step #218. On the other hand, in step #214 above, A _vf ≧
If it is determined that it is A _VP , the next step #216
It is determined whether A _vf > A _vn . When A _vf > A _vn , the control aperture value A _vf
is defined as A _vn and moves to step #218. A _vf ≦
When A _vn , immediately move to step #218. At step #218, the following calculation is performed: E _v +1 - A _vf = T _va (26). Next, in step #219, it is determined whether T _va >T _vf , and if T _vf ≧T _va , the process further advances to step #131. On the other hand, when T _va > T _vf , the process moves to step #220. In step #220, T _va
It is determined whether ≦8, and when T _va >8,
The process moves to step #222, the control exposure time T _vf is set to 8, and the process moves to step #131. If it is determined in step #220 that T _va ≦8, then in step #221 the control exposure time T _vf is determined to be T _va calculated by equation (26), and Move to step. As mentioned above, when shooting in external light strobe mode, the aperture value of the photographic aperture device APL is
Controlled by the aperture value set on the flash unit FL. In this case, if the exposure time determined according to the brightness of the subject is between the exposure time determined according to the focal length of the interchangeable lens LE and the synchronization limit exposure time, the control exposure time T _vf is set to the subject brightness. The exposure time shall be determined according to the On the other hand, when the exposure time determined according to the subject brightness is outside the above range, the control exposure time T _vf is determined as the exposure time determined according to the focal length or the exposure time of the tuning limit. In step #131 in Figure 10, the maximum light amount data I _vnax is based on the data from the strobe.
Based on the film sensitivity S _v and the distance data from the lens D _v , calculate I _vnax + S _v − D _v = A _vd (27) to calculate the aperture value A _vd of the interlocking limit for flash photography. do. Then, in step #132, it is determined whether A _vf > A _vd ,
When A _vf > A _vd , the control aperture value A _vf becomes smaller than the interlocking limit aperture value A _vd , resulting in insufficient light emission, and the process moves to step #133. On the other hand, when A _vf ≦ A _vd in step #132, the control aperture value A _vf is set to an aperture value that is more open than the interlocking limit aperture value A _vd , resulting in insufficient light output. This does not occur, and the process moves to step #138 without issuing an out-of-interlock warning. If it is determined in step #132 that A _vf > A _vd , the following _calculation is performed in step _# 133, and the calculated aperture _value A Calculate the intermediate aperture value _v between _vf and the interlocking limit aperture value A _vd , and
An out-of-linkage warning is issued on the display device RA shown in the figure. Next, in step #135, it is determined whether _v < A _vp , and if _v < A _vp , A _vp is set as the control aperture value A _vf , and if _v ≥ A _vp , _v is set as A _vf in #138
Move on to the next step. In step #138, the following calculation is performed: I _vnax +S _v -A _vf =D _nax (29-1). Further, in step #139, the following calculation is performed: I _vnio +S _v -A _vf =D _Vnio (29-2). Both formulas (29-1), (29-2)
Accordingly, the longest interlocking distance D _vnax and the shortest interlocking distance D _vnio for the control aperture value A _vf are calculated. These data D _vnax and D _vnio are sent to the strobe device FL via the strobe control device FC, as described later, and in the strobe device FL,
Controls the amount of light emitted by the strobe device FL based on the signal from the photodetector PD ₁ on the camera body side.
Indicates that flash photography will be performed in TTL mode. Here, I _vnio is data indicating the minimum amount of light emission in the strobe device FL. In addition, the strobe device attached to the camera body
The minimum light emission amount of the flash unit is adjusted in advance to a constant value, and the data representing the minimum light emission amount is stored in advance in a storage device (not shown) on the camera body side, and the data representing the minimum light emission amount of the strobe device FL is read from the storage device. The light emission amount data _Ivnio may also be read out. Next, in step #140, the number of aperture stages ΔA _vf of the photographic aperture device APL is calculated according to the following formula. A _vf −A _vp = ΔA _vf (30) In step #141, the exposure deviation value ΔE _v is calculated according to the following formula. (E _v +1) - (A _vf + T _vf ) = ΔE _v (31) The calculated deviation value ΔE _v is displayed on the display section DP ₁ in FIG. 3. The deviation value ΔE _v indicates how much the sub-subject deviates from the proper exposure when performing strobe photography. In step #142, it is determined whether ΔE _v calculated in step #141 satisfies ΔE _v ≧0. Then, when ΔE _v ≧0, that is, E _v ≧10 in FIG. 7, the fill-in flash mode is set, so the terminal O ₁₁ is set to “High” and the process moves to step #145. On the other hand, if it is determined in step #142 that △E _v <0, in this case the mode uses a strobe device as the main light source, so in step #144 terminal O ₁₁ is set to "Low" and the output is set in step #145. Move on to the next step. The operation of the strobe control circuit FC when this terminal _O11 is "High" and "Low" will be described later. Next, in step #145, it is determined whether the photographing distance data D _v from the lens matches the longest photographing distance data D _v ∞ from the lens.
Here, the longest shooting distance data D _v ∞ is the shooting distance data D _v at a position one scale before infinity.
Since this data differs for each lens, it is sent from each interchangeable lens to the camera body as fixed data. Details regarding this will be described later. When D _v ≧D _v ∞ is determined in step #145,
In this case, even if you take flash photography, there is a very high probability that the exposure will be insufficient because the shooting distance is close to infinity, and flash photography is basically impossible, so step #146 Display device FIP (3rd
A warning is given in step #37 in FIG. 6. On the other hand, if it is determined in #145 that D _v <D _v ∞, the process directly proceeds to step #37 in FIG. The above is an explanatory diagram of the strobe calculation operation in step #36 of FIG. Note that over warning, under warning, out-of-interlock warning, and infinity warning are performed by setting terminals O ₁ , O ₂ , O ₃ , and O ₄ to "High", respectively. By the way, although FIGS. 10 and 11 do not explain the case where there is no need to issue such a warning, when there is no need to issue a warning, the terminals O ₁ , O ₂ , O ₃ , O ₄ “Low”
It is necessary to output a signal of If this is not done, a problem will occur if a warning is issued and then the warning state is maintained even if the situation of the subject changes and there is no longer a need to issue a warning. . This has been omitted to simplify the flowchart. Next, the operation of the apparatus shown in FIG. 3 will be explained again according to the flowchart shown in FIG. In step #38, a charge completion signal (hereinafter referred to as a charge completion signal) indicating that the charging voltage of the main capacitor (not shown) in the strobe device FL has reached a predetermined value is input from the strobe device FL to μ-com1. Determine whether there are any. When the fullness signal is input, in step #39, the camera device is set to flash photography mode, and the control exposure time T _vf , control aperture value A _vf , and exposure error in the exposure control mode are determined. ΔE _v is displayed on display device DP ₁ . Next, the terminal _O10 is set to "High", and the data representing the distances D _vnax and D _vnio corresponding to the maximum and minimum interlocking limits calculated in steps #138 and #139 are transferred from the strobe control device FC to the strobe device FL. transmission starts, and “Low” is applied to terminal _i5 .
Wait for the signal to be input. When the above-mentioned data D _vnax and D _vnio have been sent to the strobe device FL, the terminal _i5 is set to "Low", and the process moves to the next step #42, where the terminal _O10 is set to "Low". , move to step #44. In step #38 above, the fullness signal is μ-
If it is determined that there is no input to com1, the process moves to step #43, where it is determined that the camera device takes pictures in constant light mode, the exposure control mode at the time of taking pictures, the control exposure time T _vc ,
The control aperture value A _vc and the exposure error △E _v are
Shown on the diagram display device DP ₁ , next step #44
to move to. In step #44, it is assumed that the exposure control operation in the camera device can be executed, that is, an interrupt can be performed, and the process returns to step #1. Then, when you return to step #1, turn on the metering switch.
MS is closed and therefore the terminal ST of μ-com1
It is then determined whether a “High” signal is input. When the terminal ST is "High", the operations from step #7 onward are performed in the same manner as described above. On the other hand, when returning to step #1, if the photometric switch MS is opened and therefore the terminal ST of μ-com1 is "Low", the process returns to step #2.
Then, it is determined whether the terminal _i2 is "Low". When the exposure control operation has been completed and the film winding and shutter charging operations have not yet been completed, the switch CS is open and the terminal i ₂
If it is in the "Low" state, the process moves to step #4. In step #4, a blank display signal for commanding display erasure is output, and in step #5, the above-mentioned interrupt is disabled and μ-com 1 stops operating. In step #2 above, the film winding and shutter charging operations have been completed, and the switch CS
When it is determined that the terminal _i2 of μ-com1 is “High”, the process moves to step #3. Then, in step #3, it is determined whether the contents of the timer register TR have reached a certain value K or not. timer register
When the contents of TR have reached a certain value, the process moves to the step #4 mentioned above, while when it has not reached the certain value K, 1 is added to the contents of the timer register TR, and the operation starts from step #8. of,
This is done in the same manner as described above. More than μ-com1
To summarize the operations in , data reading, calculation, and display operations are repeatedly performed while the photometry switch MS is closed. Furthermore, even if the photometry switch is released, if the film winding and shutter charging operations have been completed, the data will be stored for a certain period of time (the period from when the contents of the timer register TR go from 0 to K) in the same manner as described above. The operations of reading, calculating, and displaying are performed repeatedly.
When the photometric switch MS is opened and the predetermined period of time has elapsed, the above-mentioned operation stops. The above-mentioned fixed time is, for example, about 15 seconds. When the photometric switch MS is closed and the first calculation operation is completed, it becomes possible to accept an interrupt signal to the interrupt terminal it in step #44. Then, when the film winding and shutter charging operations are completed and the accidental exposure prevention switch CS is closed, the release switch RS is
When the AND circuit AN1 is closed, the output of the AND circuit _AN1 becomes "High", and an interrupt signal is input to the interrupt terminal it. At this time, the calculation of the exposure control data has been completed and it is now possible to accept an interrupt signal, so the process moves to the flow for performing the exposure control operation from step #50 onwards. In this way, as long as exposure control data is calculated and interrupt operation is possible, no matter what step the μ-com 1 is performing, upon receiving an interrupt signal, it will immediately Move to a specific step after #50 and execute the operation after that step. When the release button (not shown) is pressed and the release switch RS is closed, an interrupt signal is input to μ-com1, and step #50
When the process moves to step #50, a blank command signal instructing to erase the display is output. Next, in step #51, when data is being read from the lens side circuit LEC, the data from the lens is being read from the μ-com1.
Outputs a “Low” signal to terminal _O6 so that it is not input to the terminal. On the other hand, strobe device
When the interrupt signal is applied to μ-com1 while data is being read from FL to μ-com1, the terminal _i4 changes from “High” to “Low”.
Wait until. After that, when terminal i ₄ becomes “Low”, a “Low” signal is output to terminal O ₉ ,
Move to step #54. In step #54, the strobe controller FC
When data is being transferred from the flash unit FL to the flash unit FL, the above interrupt signal is sent to the μ-com
When it is input to 1, it waits until the terminal _i5 changes from "High" to "Low". Then, when the terminal _i5 becomes "Low", the process immediately moves to step #55, and then changes the terminal _O10 to "Low" and moves to step #56. In step #56, terminal _O8 is set to “High” and the strobe control device FC is connected from the strobe device FL to the strobe control device FC.
It is determined whether or not a fullness signal has been input to. Then, when it is determined that the reading of the charge completion signal of the main capacitor _C0 in the strobe device FL is completed by switching the terminal _i6 to "Low", the process moves to step #58, and the terminal _O8 switches to "Low". ” and
In the next step #59, it is determined whether the terminal _i7 is "High". When the above-mentioned fullness signal is input from the strobe device FL to μ-com1,
The terminal _i7 of μ-com1 is set to "High", and when the fullness signal is not input, the terminal _i7 is set to "Low". If it is determined in step #59 that the terminal _i7 is "High", then in step #60, the number of aperture steps for performing strobe photography calculated in step #30 or #36 is changed.
Data representing A _vf is output from output port _OP2 to the aperture control device CA. Then, in the next step #61, the exposure time data T _vf is sent from the output port _OP1 to the exposure time control device CT. On the other hand, in the above step #59, the fullness signal is not input to μ-com1, and therefore,
When terminal _i7 is determined to be “Low”, the process moves to steps #62 and #63, and as described above,
Calculated in step #31 or #37,
Number of aperture steps when shooting with constant light △
Data representing A _vc and data representing exposure time data T _vc are output from output ports OP ₂ and OP ₁ , respectively. As mentioned above, the shutter SHT
Immediately before starting the release of the flash device FL
From there, it is determined whether a full charge signal is being input to μ-com 1, and when the full charge signal is being input to μ-com 1, control data for performing strobe photography is output to each device to be controlled. , when the fullness signal is not input, each control data for photographing with constant light is output to each device to be controlled. Next, in step #64, the terminal _O5 is set to "High", the release circuit RL starts operating, and a "Low" signal is applied to the base of the power supply transistor _BT1 via the inverter _IN3 . Thereafter, even if the photometric switch MS is opened, the transistor _BT1 is self-maintained in a conductive state. Above release circuit RL
When the exposure control mechanism 3 starts operating, the exposure control mechanism 3 shown in FIG.
starts working. In the exposure control mechanism 3, when the aperture ring (not shown) starts the aperture operation, a number of pulses corresponding to the amount of rotation of the aperture ring is input from the pulse generator PG to the aperture control device CA. The aperture control device CA counts the pulses input from the pulse generator PG, and the counted value is the number of aperture stages △A _vc from the output terminal OP ₂ .
Or, when the value matches the numerical value of the data representing ΔA _vf , the rotation of the aperture ring by the aperture control device CA is stopped. In this way, the shooting aperture device
The aperture aperture of the APL is determined. In this case, if the camera device is, for example, a single-lens reflex camera, as shown in FIG.
At the same time, the operation of raising the Once the above reflection mirror RM has been raised, and the photographic aperture device
When the aperture aperture of the APL is determined, as shown in Fig. 4, the front curtain of the shutter SHT starts running, and the exposure time control device CT
1 starts counting the exposure time based on the data input from the output terminal _OP1 . When the camera device is set to flash photography mode by the strobe device FL, a flash start command signal is input from terminal JB ₇ of the strobe control device FC to terminal JF ₃ of the strobe device FL when the shutter SHT is fully opened. , the strobe device FL starts generating flash light.
When the strobe side mode is TTL mode, when the integral value of the photometric amount by the film surface photometry circuit (described later) in the strobe control device FC reaches a predetermined value, light is emitted from terminal JB ₅ to terminal JF ₁ of the strobe device FL. A stop signal is input, and the strobe device FL stops emitting light. Regardless of whether the camera device is set to flash photography mode or constant light photography mode, the count value of the exposure time in the exposure time control device CT is determined at the output terminal of μ-com1. When the value of the exposure time data input from OP ₁ is reached, the exposure time control device CT starts running the trailing curtain in the shutter SHT. When the rear curtain of the shutter SHT has finished running, the accidental exposure prevention switch is activated.
CS is opened, the reflection mirror MR is lowered, and the aperture aperture of the photographing aperture device APL is set to the open aperture, as shown in FIG. 4, and the exposure operation is completed. When the above exposure control operation is completed, the accidental exposure prevention switch CS is opened, the output of the inverter _IN5 becomes "Low", that is, the input terminal _i2 of μ-com1 becomes "High", and in step #66, The output terminal _O5 becomes "Low", the release circuit RL stops operating, and the self-holding of the power supply transistor _BT1 is released. Next, in step #67, the interrupt terminal
It is impossible to accept interrupt signals to it,
Return to start. If the photometric switch MS is closed at this time, data reading, calculation, and display are performed again in the same manner as described above.
Furthermore, if the unintentional exposure prevention switch CS is open and the photometry switch MS is closed, reading, calculation, and display are performed in the same manner as described above, while μ-com1 receives an interrupt signal. However, even if the release switch RS is closed, the unintentional exposure prevention switch CS is open, so the output of the AND circuit AN ₁ is kept at “Low”. be done. Therefore, no interrupt signal is input to the interrupt terminal it of μ-com 1, and it is possible to reliably prevent μ-com 1 from accidentally performing an exposure control operation. FIG. 12 shows a specific example of the strobe control device FC in the camera device of FIG.
The figure shows a specific example of the strobe device FL. The operations of the devices FC and FL shown in FIGS. 12 and 13, respectively, will be explained below. When the main switch MAS shown in FIG. 13 is closed, power is supplied from the power supply battery FB to the strobe device FL, and a reset pulse is output from the output terminal PR ₃ of the power-on reset circuit PO ₃ to reset the strobe device FL. Each circuit section is reset. When the switch SS ₁ on the strobe side is switched to the contact CU side, the strobe device FL is set to the first mode for a camera of the first flash photography control type. At this time, the output of inverter IN ₁₄ becomes "Low", the output of IN ₁₅ becomes "High", and therefore the output of OR circuit OR ₁₈ becomes "High",
This "High" signal is applied to the base of transistor _BT8 . Therefore, at the same time as the main switch MAS is closed, the transistor _BT8 becomes conductive and the booster circuit DD starts boosting operation. On the other hand, when the changeover switch _SS1 is switched to the contact EX side, the strobe device FL is set to the second mode for the camera of the second flash photography control type.
At this time, the output of inverter IN ₁₅ is “Low”, and on the other hand, the above-mentioned power-on reset signal PR ₃
Therefore, the output of OR circuit OR ₁₄ is “High”,
The flip-flop FF ₁₁ is reset by the "High" signal from the OR circuit OR ₁₄ . Therefore, the output of the OR circuit _OR18 becomes "Low". Therefore, just by closing the main switch MAS, the transistor _BT8 does not become conductive, and the booster circuit DD does not operate. Photometering switch MS on the camera body side shown in Figure 3
is closed and “Low” is applied to the base of transistor BT ₁ .
applying a signal to make the transistor BT ₁ conductive;
When power is supplied from the power battery BB on the camera body side to the power-on reset circuit _PO2 via the transistor _BT1 , the power-on reset circuit _PO2
A power-on reset signal PR ₂ is output, and this power-on reset signal PR ₂ is applied to the strobe control device FC shown in FIG.
will be reset. In addition, the above photometering switch MS
When closed, the output of inverter IN ₂ is “High”
Then, the one-shot circuit _OS1 in the strobe controller FC shown in FIG. 12 outputs a "High" pulse. This “High” pulse is an OR circuit.
OR ₆ , camera body side terminal JB ₅ , strobe device FL
Through the terminal JF ₁ on the side, the strobe device shown in Fig. 13
Applied to the set terminal of flip-flop _FF11 in FL. Therefore, flip-flop FF ₁₁
is set, and the output of OR circuit OR ₁₈ is “High”
This “High” signal is the transistor
The voltage is applied to the base of _BT8 , the transistor _BT8 becomes conductive, and the booster circuit DD operates. In addition, the above-mentioned “High” pulse is applied from the terminal JF ₁ of the strobe device FL to the timer circuit TI ₁ , and this timer circuit
TI ₁ outputs a pulse when a predetermined time, for example, 0.5 seconds has elapsed since receiving the pulse. The pulse output from the timer circuit _TI1 is input to the reset terminal of the flip-flop FF11 via the OR circuit _OR14 , and the pulse is input to the reset terminal of the flip-flop _FF11 .
FF ₁₁ is reset and the flip-flop FF ₁₁
The Q output of is "Low", and this "Low" signal is applied to the base of the transistor _BT8 via the OR circuit _OR18 , and the transistor _BT8 is turned off. Therefore, booster circuit DD stops operating.
This timer circuit _TI1 is reset and performs a predetermined timing operation every time it receives one pulse from the terminal _JF1 . As mentioned above, the terminal of the strobe control device FC
While the “High” signal is applied from JB ₅ to terminal JF ₁ of the strobe device FL at a cycle shorter than the above-mentioned predetermined time (0.5 seconds), the step-up circuit DD of the strobe device FL is activated, but the camera body metering switch
By opening MS, the transistor BT ₈ is turned off after a short predetermined time of 0.5 seconds set in the timer circuit TI ₁ of the strobe device FL has elapsed, and thus the operation of the booster circuit DD is stopped. In this way, the booster circuit DD is enabled to operate only for the minimum necessary period, thereby preventing unnecessary consumption of power in the booster circuit DD. Note that the timer circuit _TI1 may output a reset pulse after a period of, for example, about 10 minutes after receiving the first pulse. In the strobe device FL, when flip-flop FF ₁₁ is set, flip-flop FF ₁₀ and D flip-flop DF ₁₀ are
Both have been reset. Therefore, the Noah circuit
The output of NO ₁ is “High”. At this time, as described later, the output of NAND circuit NA ₁ is “High”
Therefore, the outputs of the AND circuit AN ₂₂ and the OR circuit OR ₂₁ are both "High". Here, the changeover switch SS ₁ is closed to the contact EX side, and the strobe device FL is switched to the second
When set to mode, the AND circuit AN ₂₄
A “High” signal is applied to both input terminals of the AND circuit AN24, and the output of the AND circuit _AN24 is “High”.
becomes. Therefore, the output of the OR circuit OR ₂₂ becomes "High", and this "High" signal is applied to the base of the transistor BT ₆ to
BT ₆ is turned on, a transistor BT ₇ complementary connected to this transistor BT ₆ is turned on,
From this transistor BT ₇ , the strobe device
From terminal JF ₂ of FL to terminal JB ₆ of strobe controller FC
, a “High” signal is sent. When the above-mentioned photometry switch MS is closed, when the terminal _O9 of μ-com1 in the camera body shown in FIG. 3 becomes "High", the one-shot circuit _OS2 of the strobe control device FC shown in FIG. 12 is activated. is turned on, and one pulse is output from the one shot circuit _OS2 . At the rise of this pulse,
Flip-flop _FF1 is set and counter _CO1 is reset. Then, every time one pulse is input from the frequency divider DV of the strobe controller FC to the D flip-flop DF ₁ connected to the Q terminal of the flip-flop FF ₁ , the D flip-flop DF ₁ is input at the rising edge of the pulse DP. The Q output terminal of becomes “High”. Note that the period of the pulse DP from the frequency divider DV is determined to be shorter than the predetermined time of the timer circuit _TI1 of the strobe device FL. Every time the Q output terminal of this D flip-flop _DF1 becomes “High”, the AND circuit
A pulse corresponding to the above pulse DP from AN ₂ is sent to the OR circuit OR ₆ and the terminal JB ₅ of the strobe control device FC.
via the terminal JF ₁ of the strobe device FL in Fig. 13.
is applied to Further, a pulse generated from the AND circuit _AN2 based on the pulse DP described above is applied to the counter _CO1 . Furthermore, every time the Q output terminal of the D flip-flop DF ₁ becomes “High”,
This “High” signal activates the one-shot circuit OS ₃ .
One pulse is output from , and this pulse is inverted by the inverter _IN7 . Then, in response to the output of the "Low" pulse signal from the inverter _IN7 , a "High" pulse having a predetermined pulse width is applied from the NAND circuit _NA5 to the base of the transistor _BT10 , and the transistor _BT10 It is turned on while this pulse is applied. In this way, while transistor BT ₁₀ is turned on,
“Low” signal is the terminal of the strobe control device FC
Through JB ₆ , the terminal of the strobe device FL in Fig. 13
Entered into JF ₂ . In the strobe device FL of FIG. 13, when the changeover switch SS ₁ is closed to the contact EX side and set to the second mode, the strobe control device FC of FIG. When a "Low" signal is applied to the terminal JF ₂ of the strobe device FL while the transistor BT ₁₀ is turned on, this "Low" signal is inverted by the inverter IN ₂₀ , and this inverted pulse is sent to the AND circuit.
Output from output terminal FR of AN ₂₅ . Then, when the pulse from the output terminal FR of the AND circuit AN ₂₅ and the pulse DP applied to the above-mentioned terminal JF ₁ are applied to the AND circuit AN ₁₀ , the AND circuit AN ₁₀
to the set terminal S of flip flop FF ₁₀ ,
A pulse corresponding to the pulse from the terminal FR of the AND circuit AN ₂₅ is applied, and the flip-flop
FF ₁₀ is set. Therefore, the Q output terminal of the flip-flop FF ₁₀ is set to "High", and this "High" signal is applied to one input terminal of the NOR circuit NO ₁ , and from this NOR circuit NO ₁ one of the AND circuits AN ₂₂ is output. A "Low" signal is applied to the input terminal, and the output of the AND circuit AN ₂₂ becomes "Low". When the Q output terminal of the flip-flop _FF10 becomes "High", this "High" signal is applied to one input terminal of the AND circuit _AN11 . Therefore, the signal applied from the OR circuit OR ₁₂ to the other input terminal of the AND circuit AN ₁₁ is applied to the above transistor via the OR circuits OR ₁₃ and OR ₂₁ , the AND circuit AN ₂₄ , and the OR circuit OR ₂₂ . is applied to the base of BT ₆ , and a “Low” voltage is applied to the base of transistor BT ₇ during the period when transistor BT ₆ is turned on.
A signal is applied to turn on the transistor _BT7 . In this way, a "High" signal corresponding to the output of the above-mentioned OR circuit OR ₁₂ is input from the terminal JF ₂ of the strobe device FL to the terminal JB ₆ of the strobe control device FC shown in FIG. As mentioned above, the output terminal of the AND circuit AN ₂₅
Every time one pulse is output from FR, the pulse is applied to the reset terminal RE of the counter CO ₃ via the OR circuit OR ₁₀ , and the counter CO ₃ is
It is reset by a pulse from the above-mentioned OR circuit _OR10 . This counter _CO3 counts the pulses DP input from the terminal _JB5 of the strobe control device FC to the terminal _JF1 of the strobe device FL. A decoder DE ₂ is connected to the counter CO ₃ above,
This decoder DE ₂ is the output terminal of the counter CO ₃
Depending on the signal output to CF ₀ to CF ₃ , terminal b ₀
As shown in Table 3, "High" and "Low" signals "H" and "L" are output from b8 to _b8 .

【table】

[Table] The terminal b ₀ of the decoder DE ₂ is set to "High" during the period from the fall of the first pulse input from _{the terminal JF 1 of} the strobe device FL to the fall of the second pulse. become. The “High” signal of this terminal b ₀ is input to one input terminal of the AND circuit AN ₇₀ , and the completion signal from the completion signal output circuit CD is input to the other input terminal of the AND circuit AN ₇₀ . are connected like this. This charge completion signal output circuit CD outputs a "High" charge completion signal when the charging voltage of the main capacitor _C0 in the strobe device FL reaches a predetermined value.
When the predetermined value has not been reached, the fullness signal is not output. Therefore, the AND circuit AN ₇₀ receives the "High" signal from the terminal b ₀ of the decoder DE ₂ , and also outputs the "High" signal when receiving the completion signal from the completion signal output circuit CD. “High”
The signal is applied to the base of the transistor BT ₆ described above via the OR circuit OR ₁₂ , the AND circuit AN ₁₁ , the OR circuits OR ₁₃ and OR ₂₁ , the AND circuit AN ₂₄ , and the OR circuit OR ₂₂ , and the transistor BT ₆ is turned on. Therefore, the transistor BT ₇ is also turned on. By turning on the transistor _BT7 ,
A “High” signal is sent from terminal JF ₂ of the strobe device FL to the above-mentioned strobe control device FC on the camera body side.
input to terminal JB ₆ . Then, “High” is input to terminal JB ₆ of the strobe control device FC mentioned above.
The signal is sent to the AND circuit of the strobe controller FC.
Series input terminal of shift register SR ₁ via AN ₃
Applied to SI. This shift register SR ₁ takes in the "High" signal from the above-mentioned AND circuit AN ₃ when receiving the second pulse from the AND circuit AN ₂ . Next, terminal b ₁ of the above decoder DE ₂ is connected to the counter
CO ₃ becomes "High" during the period from the fall of the second pulse inputted from the terminal JF ₁ to the fall of the third pulse. This “High” signal is input to one input terminal of the AND circuit AN ₇₁ , and is also input to the other input terminal of the AND circuit AN ₇₁ from the inverter IN ₁₃ in either the TTL mode or the external light mode described below. It is connected so that a signal indicating whether the mode is selected is input.
When the switch MOS is closed to the contact TT side and the TTL mode is selected in the strobe device FL, the inverter IN ₁₃ outputs a "High" signal, the switch MOS is closed to the contact OU side,
When the external light mode is selected, inverter IN ₁₃ outputs a "Low" signal. The output signal of this inverter IN ₁₃ is transmitted from the terminal JF ₂ of the strobe device FL in the same manner as the above-mentioned fullness signal.
Input to terminal JB ₆ of the above strobe control device FC,
Furthermore, the AND circuit of this strobe controller FC
When the third pulse is received from _{the AND circuit AN 2 via} AN 3, it is taken into the shift register SR ₁ . Also, in the same manner as described above, terminals b ₂ to b ₅ of decoder DE ₂ are connected to the counter via the terminal JF ₁ .
It becomes "High" in response to the falling edge of the third to sixth pulses that are sequentially input to CO ₃ . “High” appearing on terminals b ₂ to b ₅ of this decoder DE ₂
The signals are sequentially input to one input terminal of each of the AND circuits AN ₇₂ to AN ₇₅ . On the other hand, a signal from the decoder DE ₃ to the other input terminal of each of these AND gates AN ₇₂ to AN ₇₅ is connected to the strobe device.
A symbol representing the maximum light emission amount I _vnax of FL is input. The signal representing this maximum light emission amount Ivmax is
Similar to the operation of the AND circuits AN ₇₀ and AN ₇₁ described above, the signal is sent to the terminal JF ₂ of the strobe device FL via the AND circuits AN ₇₂ to AN ₇₅ , and further,
The signal is taken into the shift register SR ₁ from the terminal JB ₆ of the strobe controller FC. Table 4 shows an example of the relationship between the symbols appearing at the output terminals G ₀ , G ₁ , G ₂ , and G ₃ of the decoder DE ₃ and the value of the maximum light emission amount I _vnax .

[Table] The input terminal of the decoder DE ₃ is linked to an adjustment mechanism (not shown) that adjusts the light distribution characteristics by changing the relative position between the light emission panel and the reflector in the strobe device FL. It is connected to data output means GS and means PS for outputting a signal representing the type of light emitting panel (not shown) used in the strobe device FL. In addition, in this embodiment, the panel for light emission is a panel for wide-angle photography, or
Any of the normal photography panels are meant to be used. This configuration allows decoder DE ₃
outputs data representing the maximum light emission amount I _vnax shown in Table 4 based on the two data input from the means GS and PS. Furthermore, terminals b ₆ to b ₈ of the decoder DE ₂ are
In response to the falling edges of the 7th to 9th pulses that are sequentially input to the counter CO ₃ via the terminal JF ₁ , the pulses become "High" one after another. The “High” signals appearing at terminals b ₆ to b ₈ of this decoder DE ₂ are sequentially
The signals are input to the other input terminals of AND circuits AN ₇₆ to AN ₇₈ , respectively. And these AND circuits
Signals representing the aperture value set in the strobe device FL are sequentially input from the decoder DE ₄ to the other input terminals of AN ₇₆ to AN ₇₈ , respectively. The input terminal of the decoder DE ₄ is connected to an aperture value signal output means that operates in conjunction with an adjustment mechanism (not shown) that adjusts the aperture of the light-receiving aperture AP provided in front of the phototransistor PT of the strobe device FL.
Connected to APS. Table 5 shows an example of the relationship between the signals appearing at the output terminals F ₀ , F ₁ and F ₂ of the decoder DE ₄ and the set aperture value A _v .

[Table] Setting aperture value output from the above decoder DE ₄
The signal representing A _v is sent to the strobe control device in the same way as the data output from the decoder DE ₃ described above.
Read into shift register SR ₁ of FC. Further, when the 10th pulse input to the counter CO ₃ falls in the decoder DE ₂ as described above, the terminal b ₈ of the decoder DE ₂ becomes
Switched to “Low”. This "Low" signal is input to the reset terminal R of the flip-flop FF ₁₀ via the OR circuit OR ₁₁ , and the flip-flop
The Q output terminal of FF ₁₀ is switched to “Low”. This "Low" signal is input to one input terminal of the AND circuit AN ₁₁ , the output of the AND circuit AN ₁₁ becomes "Low", and the output of the NOR circuit NO ₁ becomes "High". In this way, the terminal _JF2 of the strobe device FL becomes "High" again. On the other hand, when the 10th pulse DP is input to the decimal counter CO ₁ in the strobe controller FC,
A pulse is output from its carry terminal CY, and this pulse is inputted to the reset terminal R of the flip-flop FF ₁ and the reset terminal RE of the D flip-flop DF ₁ via the OR circuit OR ₁ , and both flip-flops FF ₁ and DF ₁ are , and the Q output terminals of both flip-flops _FF1 and _DF1 are both set to "Low". “Low” output to Q output terminal of D flip-flop DF ₁
The signal is input to one input terminal of AND circuits AN ₂ and AN ₃ , and both AND circuits AN ₂
and AN ₃ are both closed. Then,
From the terminal JF ₂ of the strobe control device FL to the terminal JF 2 of the strobe control device FC as described above.
Reading of the data representing the maximum light emission amount I _vnax and the set aperture value A _v inputted to JB ₆ into the shift register SR ₁ is stopped. Also, flip-flop FF ₁
The "Low" signal at the Q output terminal of is input to the input terminal _i6 of μ-com1. By this, μ−
In com1, it is determined that reading of data from the strobe device FL to the strobe control device FC has been completed. Furthermore, the data read into the shift register SR ₁ is transferred to the data selector shown in Figure 3.
Data specified by a selection command signal input to the input port _IP7 of MP ₁ and input from μ-com1 to terminal SL of data selector _MP1 is read into μ-com1 via data bus DB. Note that in this embodiment, the shift register
A 9-bit shift register is used as SR _1. Therefore, in order to input all the data read into the shift register SR ₁ to μ-com 1, if the number of bits in μ-com 1 is small, This is carried out in a known manner, for example, in two or three times. Furthermore, if the strobe device FL is not attached to the camera device, or even if it is attached, when the power switch MAS of the strobe device FL is turned off, all data input to shift register SR ₁ is It becomes “0”. In this way, based on the data input from data selector MP ₁ to μ-com 1 via data bus DB, it can be determined that strobe device FL is not attached to the camera device and that power switch MAS is closed. It is beginning to be determined that there is no such thing. Switch SS ₁ of the strobe device FL above is the contact CU
When the mode is switched to the side and set to the first mode, the output of the inverter _IN14 is set to "Low". This closes the gate of AND circuit AN ₂₄ , and I _vnax via the above-mentioned OR circuit OR ₁₂ ,
Data such as set aperture value is not transferred. Therefore, the output of inverter IN ₁₅ is “High”
This "High" signal is input to one input terminal of the AND circuit _AN20 . When the fullness signal is input from the fullness detection circuit CD to the other input terminal of the AND circuit AN ₂₀ , this AND circuit
The output of AN ₂₀ becomes “High”. At this time, as will be described in detail later, the output of the AND circuit AN ₂₆ remains "Low" until the X contact SX of the strobe control device FC is closed.
Inverter with “Low” signal input from AN ₂₆
The output of IN ₁₆ is “High”. Therefore, both the AND circuit AN ₂₀ and the inverter circuit described above are connected to the two input terminals of the AND circuit AN ₂₃ .
A "High" signal is input from IN ₁₆ , and the output of the AND circuit AN ₂₃ becomes "High". The “High” signal from this AND circuit AN ₂₃ is sent to the OR circuit OR ₂₂
is applied to the base of the transistor BT ₆ through the transistor BT ₆ and the transistor BT 6 becomes conductive. When the transistor BT ₆ becomes conductive, the transistor BT ₇ becomes conductive as described above. Therefore, the fullness signal is input from the terminal JF ₂ of the strobe device FL to the terminal JB ₆ of the strobe control device FC. In this way, when the first mode is set, the strobe control device is switched from the strobe device FL to the strobe control device.
Unlike the case of the second mode described above, only the charge completion signal is always read into the shift register SR ₁ of the FC as a "High" signal during data reading. In this case, as shown in Tables 4 and 5, when the second mode is set, the data to be read is coded so that it does not become all "High", so the strobe device FL The operation mode of can be determined to be the first mode. An example of a method for performing the above strobe mode determination in μ-com 1 will be described below. In a certain step, when a calculation mode for flash photography is commanded, it is first determined whether the mode is the first mode. As a result of this determination,
If it is determined that the mode is not the first mode, the process moves to step #101 in FIG. 10 and the above-mentioned calculation is performed.
On the other hand, if it is determined that the mode is the first mode, the exposure time is set to 1/250 sec, and the aperture is set to the set aperture value preset for the flash device FL, and then the process moves to step #140. do it like this. Next, data corresponding to the range in which the flash output amount can be controlled appropriately with the strobe device FL, the so-called interlocking range, is transferred from the camera body to the strobe device.
We will explain the operation of inputting to FL. In FIG. 12, when the terminal O ₁₀ of μ-com 1 becomes "High", this "High" signal is applied to the one shot circuit OS ₄ , and one pulse having a predetermined pulse width is output from this one shot circuit OS ₄ . , are applied to the set terminal S of flip-flop _FF2 and the reset terminal RE of counter _FCO2 . Therefore, the output terminal Q of flip-flop _FF2
becomes "High", and this "High" signal is input to one input terminal of each of AND circuits _AN52 and _AN4 . Further, the counter CO ₂ is reset, and the count content of the counter CO ₂ becomes zero. Furthermore, the pulse output from the one shot circuit OS ₄ is inverted by the inverter IN ₈ ,
The inverted pulse is input to the base of transistor BT ₁₀ via NAND circuit NA ₅ ,
The transistor BT ₁₀ is turned on. Therefore, a "Low" signal is input from the terminal JB ₆ of the strobe control device FC to the terminal JF ₂ of the strobe device FL shown in FIG. 13, and the output terminal FR of the AND circuit AN ₂₅ of the strobe device FL is “High”
becomes. At this time, the terminal JF ₁ of the strobe device FL is set to "Low", and this "Low" signal is inverted to "High" by the inverter IN ₁₁ and input to one input terminal of the AND circuit AN ₁₅ . Also,
The other input terminal of this AND circuit AN ₁₅ is connected to the “High” signal from the output terminal FR of the AND circuit AN ₂₅ mentioned above.
pulse is input. Therefore, this AND circuit
AN ₁₅ to flip-flop FF ₁₃ set terminal S
A pulse is input to the flip-flop FF ₁₃
is set, and its Q output terminal becomes "High". This "High" signal from the Q output terminal is input to the D input terminal of the D flip-flop _DF10 .
When one pulse FCP of a predetermined frequency is input from the oscillation circuit FOS to the clock terminal CL of this D flip-flop DF ₁₀ , the Q output terminal of this flip-flop DF ₁₀ becomes "High". This "High" signal from the Q output terminal is input to AND circuits _AN16 and _AN17 . Therefore, the AND circuit AN ₁₆ receives the pulse from the oscillator FOS.
FCP is output, and this pulse is input to the counter CO ₄ and the clock terminal CL of the shift register SR ₂ , respectively, and is also input to the OR circuits OR ₁₃ , OR ₂₁ , the AND circuit AN ₂₄ , the OR circuit OR ₂₂ , and the transistor
It is sent to terminal JF ₂ via BT ₆ and BT ₇ , and sent from terminal JB ₆ on the camera body side to the clock terminal of the above-mentioned reset counter CO ₂ via AND circuit AN ₄ .
Given to CL. Q output of D flip-flop DF ₁₀ is “High”
One-shot circuit OS ₁₁ to “High”
This pulse is output and the shift register _SR2 is reset via the OR circuit _OR17 . In addition, counter CO ₄ is OR circuited by the pulse from terminal FR.
It has been reset via _OR16 . The counter _CO2 on the strobe control device FC side is a counter that counts the pulses FCP from the strobe device FL inputted from the AND circuit _AN4 , and its output is inputted to the decoder _DE1 . This decoder DE ₁ is similar to the decoder DE ₂ in FIG. 13, and as the output data of the counter CO ₂ increases by 1, the terminals a ₀ , a _{1 ,} . Outputs a “High” signal. Here, the following explanation will be given assuming that the D _vnax data transferred from the camera body to the FL of the strobe device is n-bit data. When the first pulse FCP is input from the AND circuit AN ₄ to the counter CO ₂ , the terminal a ₀ of the decoder DE ₁ becomes “High” at this rising edge.
It remains “High” until the rise of the second pulse. This opens the gate of the AND circuit AN ₆₀ , and the output from the output port OP ₄ of μ-com1 is
The data of the most significant bit of the D _xnax data is OR circuit OR ₃ , AND circuit AN ₅₂ , OR circuit OR ₆
It is output from the terminal JB ₅ via the strobe side terminal JF ₁ and is applied to the serial input terminal SI of the shift register SR ₂ via the AND circuit AN ₁₇ . This shift register SR ₂ is designed to take in data at the falling edge of the pulse FCP from the AND circuit AN ₁₆ , so it takes in data at the falling edge of the first pulse FCP.
D Import the data of the most significant bit of _vnax . Similarly, the terminal _a1 of the decoder _DE1 becomes "High" at the rise of the second pulse FCP, and remains "High" until the rise of the third pulse FCP.
Next is the AND circuit AN ₆₁ on the strobe control device FC side.
The 2nd bit data of D _vnax is output from
This data is taken into shift register _SR2 at the falling edge of the second pulse FCP. Repeating the same operation, the terminal a _o of decoder DE ₁ becomes n+1
It becomes “High” at the rising edge of the second pulse FCP,
“High” until the rising edge of the n+2nd pulse FCP
Continue. During this time, D _vnax from AND circuit AN _6o
The data of the least significant bit of is output, and this data is taken into the shift register _SR2 at the falling edge of the (n+1)th pulse FCP. The counter _CO4 is an n+ binary counter, and the n+2nd pulse FCP is connected to the carry terminal CY.
This pulse is output from flip-flop FF ₁₃ and D flip-flop through OR circuit OR ₁₅ .
It is applied to the reset terminal of DF ₁₀ , which is reset and the gates of AND circuits AN ₁₆ and AN ₁₇ are closed. At the falling edge of this last (n+2)th pulse, shift register SR ₂ becomes “High” or “Low”
However, the data of the least significant bit may not be provided to the display section _DP2 . On the other hand, on the camera body side, the counter CO ₂ is also an n+ binary counter, and the n+2nd pulse
When FCP rises, all outputs of counter CO ₂ become “Low”, and output terminals a ₀ to _{a o} of decoder DE ₁
all become “Low”. Decoder DE ₁ terminal a _o
is connected to the reset terminal of flip-flop FF ₂ via OR circuit OR ₂ , and when the (n+2)th pulse FCP rises, the output of terminal a _o falls to “Low” and flip-flop FF ₂ is reset. , the gates of AND circuits AN ₄ and AN ₅₂ are closed. Further, the Q output of flip-flop _FF2 is connected to the input terminal _i5 of μ-com1, and μ-com1 determines that the data transfer is completed when this terminal _i5 becomes “Low”. In the strobe device FL, the display unit DP ₂ displays the interlocking range of strobe light emission based on data of D _vnax and D _vnio sent from the camera body. Switch DS is a switch that changes depending on the displayed content.
When the terminal is closed to the m side, the display is in meters.
When the terminal is closed to the ft side, feet are displayed. The interlocking range is based on the display on the camera body.
Also displayed by DP ₅ . It is preferable that the display section DP ₂ is displayed on the back of the strobe, and the display section DP ₅ is displayed inside the viewfinder, on the top of the camera, or on the back cover. The timer circuit _TI5 outputs a pulse after the pulse is output from the one-shot circuit _OS4 and a sufficient time has elapsed to transfer D _vnax and D _vnio to the strobe. This is because if the strobe device FL is not attached to the camera body, the terminal _ao of decoder DE ₁ will not fall from "High" to "Low", and flip-flop FF ₂ will not be reset after being set. It is. Therefore, the timer circuit
TI ₅ resets flip-flop FF ₂ via OR circuit OR ₂ after a sufficient time for data transfer. Next, when the release switch RS on the camera body side is closed, the first operation is to detect whether or not the flash device FL is outputting a charging completion signal.
This will be explained with reference to FIGS. 2 and 13. When the release switch RS is closed, the 12th
Terminal _O8 of μ-com1 shown in the figure becomes “High”,
This "High" signal is applied to the one-shot circuit _OS6 . This one-shot circuit OS ₆ outputs a “High” pulse with a predetermined pulse width,
This pulse is applied to the set terminal S of flip-flop _FF3 , and the Q output terminal of flip-flop _FF3 becomes "High". This "High" signal at the Q output terminal is input to the D input terminal of the D flip-flop _DF2 . And D flip-flop
When the next clock pulse DP from the frequency divider DV mentioned above is input to the clock terminal CL of DF ₂ ,
The Q output terminal of this D flip-flop _DF2 becomes "High". The "High" signal of this Q output terminal is applied to one input terminal of an AND circuit AN ₆ to which the clock pulse DP is input from the frequency divider DV, and the clock pulse DP is sent out from this AND circuit AN ₆ . . This pulse DP is
OR circuit OR ₆ , terminal of the strobe control device FC
Through JB ₅ , the terminal of the strobe device FL in Fig. 13
Entered into JF ₁ . Further, the "High" signal at the Q output terminal of the D flip-flop _DF2 is input to another one-shot circuit _OS10 . Then, one "High" pulse with a predetermined pulse width is output from the one-shot circuit OS ₁₀ , and this pulse is inverted by the inverter IN ₉ and input to one input terminal of the NAND circuit NA ₅ . From this NAND circuit NA ₅ , the above-mentioned one-shot circuit
A “High” pulse having a pulse width corresponding to the pulse width from the OS ₁₀ is output. This pulse is applied to the base of transistor BT ₁₀ , _which is turned on for a period corresponding to the pulse width of said pulse. Therefore, from the terminal JB ₆ of the strobe control device FC to the terminal JF ₂ of the strobe device FL, a “Low” signal having a pulse width corresponding to the period during which the transistor BT ₁₀ is turned on is transmitted.
pulse is input. As described above, the pulse applied to the terminal JF ₂ of the strobe device FL is inverted by the inverter IN ₂₀ and applied to one input terminal of the AND circuit AN ₂₅ . In this way, a pulse with a predetermined pulse width is output from the output terminal FR of the AND circuit _AN25 . At this time, the strobe device
As described above, the pulse DP from the strobe control device FC is input to the terminal JF ₁ of FL, and this pulse DP is input to the set terminal S of the flip-flop FF ₁₀ .
The flip-flop _FF10 is set and its Q output terminal becomes "High". This “High” signal is inverted to “Low” via the NOR circuit NO ₁ , and is input to one input terminal of the AND circuit AN ₂₂ .
Input to the other input terminal of AN ₁₁ . On the other hand, the counter _CO3 of the strobe device FL receives the above-mentioned pulse DP input to the terminal _JF1 , and its count becomes "0001". The terminal b ₀ of the decoder DE ₂ that receives the output of this counter CO ₃ is “High”
Therefore, this “High” signal is passed through the AND circuit AN ₇₀
is applied to one input terminal of Therefore, added to the other input terminal of this AND circuit AN ₇₀ ,
The signal from the above-mentioned completion signal output circuit CD is, as described above, OR circuit OR ₁₂ , AND circuit AN ₁₁ ,
OR circuits OR ₁₃ and OR ₂₁ , AND circuit AN ₂₄ ,
It is sent to the terminal JF ₂ of the strobe device FL via the OR circuit OR ₂₂ and transistors BT ₆ and BT ₇ . In this way, the fullness signal is inputted from the terminal JF ₂ of the strobe device FL to the terminal JB ₆ of the strobe control device FC on the camera body side. In addition, in the strobe control device FC, D
Q output terminal of flip-flop DF ₂ is “High”
Then, the pulse DP from the frequency divider DV mentioned above is
Sent from AND circuit _AN6 . This pulse DP
is a flip-flop through OR circuit OR ₄
FF ₃ reset terminal R and D flip-flop
It is input to the reset terminal RE of DF ₂ , and both flip-flops FF ₃ and DF ₂ are connected to the pulse DP.
It is reset at the falling edge of . In this way,
One pulse DP is sent from the strobe control device FC on the camera body side to the strobe device FL. On the other hand, in the strobe control device FC, flip-flop _FF3 is set, its Q output terminal becomes "High", and this "High" signal is
After being input to the D input terminal of flip-flop DF ₃ , the clock terminal of this D flip-flop DF ₃
At the rising edge of the pulse DP input to CL from the frequency divider DV, the Q output terminal of this D flip-flop _DF3 becomes "High". Furthermore, the above frequency divider
The next pulse DP from DV is D flip-flop DF ₃
When the signal is input to the clock terminal CL of the D flip-flop _DF4 , the Q output terminal of the D flip-flop DF4 becomes "High". The "High" signal at the Q output terminal of the D flip-flop _DF3 is input to one input terminal of the AND circuit _AN7 . Therefore, as described above, the fullness signal input from the strobe device FL to the terminal JB ₆ of the strobe control device FC is sent out from the AND circuit AN ₇ . The "High" signal at the Q output terminal of the D flip-flop _DF4 is input to one input terminal of an AND circuit _AN51 , and a "High" pulse is sent out from the AND circuit _AN51 . In this way, from the AND circuit AN ₅₁ , another “High”
When the pulse of is output, the AND circuit AN ₇
The fullness signal from the above-mentioned fullness signal output circuit CD is inputted to the D flip-flop _DF5 , and the Q output terminal of this D flip-flop _DF5 is set to "High".
Therefore, this “High” signal is the mμ-com described above.
1 input terminal _i7 . In this way,
It is input to the above-mentioned fullness signal μ-co1. Further, _the pulse sent from the AND circuit AN ₅₁ is inputted to the reset terminal RE of the D flip-flops DF ₃ and DF ₄ via _the OR circuit OR ₅ .
Both output terminals are set to "Low". The "Low" signal at the Q output terminal of the D flip-flop _DF3 is input to the input terminal _i6 of the μ-com1 as a signal indicating that the reading operation of the fullness signal from the strobe device FL is completed. . On the other hand, in the strobe device FL, when the flip-flop FF ₁₀ is set as described above, the "High" signal at the Q output terminal of the flip _- flop FF ₁₀ is input to the timer circuit TI ₈ . starts the timing operation. This timer circuit _TI8 is appropriately set to a time longer than the time required to transfer the fullness signal from the strobe device FL to the strobe control device FC. The timer circuit _TI8 outputs a "High" signal when the set time described above has elapsed, and this "High" signal is sent to the reset terminal RE of the counter _CO3 via the OR circuit _OR10 , and to the OR circuit. _OR11
The counter _CO3 and _the flip-flop _FF10 are reset at the same time. When transferring the fullness signal from the strobe device FL to the camera body side, only one pulse is given to the counter CO ₃ , so the timer circuit TI ₈
By providing an unnecessarily long counter
It is possible to prevent the output of CO ₃ from being held at "0001" and the flip-flop FF ₁₀ from being held in the set state. Pulse DP input to terminal JF ₁ of the above strobe device FL and “High” from the fullness signal output circuit CD
When the signal is input to the two input terminals of the 3-input AND circuit _AN18 , the AND circuit
Connect the above AND circuit to the other input terminal of AN ₁₈ .
When a pulse is input from the output terminal FR of AN ₂₅ ,
The pulse from the AND circuit _AN25 is input to the set terminal S of the flip-flop _FF12 via the AND circuit _AN18 , and is also input to the one-shot circuit _OS12 . Therefore, flip-flop FF ₁₂ is set and is a one-shot circuit.
OS ₁₂ “High” with one predetermined pulse width
outputs a pulse of This one-shot circuit
The pulse width output from the OS ₁₂ is set to be longer than the period of the pulse DP input to the terminal JF ₁ of the strobe device FL. In this way, when a plurality of pulses DP for data reading commands are input to the terminal JF ₁ , one pulse DP terminal JF is output during the period in which one pulse is output from the one-shot circuit OS ₁₂ . ₁ can be completed, and therefore from the AND circuit AN ₁₉ through the OR circuit OR ₁₉ , the flip-flop
The flip-flop FF ₁₂ can be reliably reset by inputting it to the reset terminal R of the FF ₁₂ . On the other hand, when only one pulse DP is input to the terminal _JF1 after the release switch RS is closed, no pulse is sent out from the AND circuit _AN19 and the flip-flop _FF12 is held in the set state. At this time, switch SS ₁ has been switched to contact EX side, and therefore inverter IN ₁₄
When the output of is "High", this "High" signal is inputted to one input terminal of the AND circuit AN ₂₆ via the AND circuit AN ₂₁ and the OR circuit OR ₂₀ . Therefore, strobe control device
From terminal JB ₇ of FC to terminal JF ₃ of the strobe device FL
When a strobe light emission start command signal is input to the strobe light emission start command signal, the strobe light emission start command signal is sent to the strobe light emission control circuit FLC via the AND circuit _AN26 , as will be described in detail below. In other words, when the second mode is set and the full charge signal is being output, the release switch cannot be pressed from the camera body.
When the RS closing signal is input, the strobe is enabled to emit light. Now, assume that the X contact SX of the strobe controller FC is closed. At this time, the strobe control device
The terminal JB ₇ of the FC is grounded and becomes "Low", and this "Low" signal is inverted by the inverter IN ₁₇ and becomes "High", and this "High" signal is
Input into one-shot circuit OS ₁₃ . Then,
The one-shot circuit OS ₁₃ outputs one “High” pulse, and this pulse is sent to the AND circuit described above.
Input to the other input terminal of AN ₂₆ . As described above, when a "High" signal is input from the OR circuit OR ₂₀ to one input terminal of the AND circuit AN ₂₆ , the pulse output from the one-shot circuit OS ₁₃ is transmitted to one input terminal of the AND circuit AN ₂₆ . Via
The signal is sent to the light emission control circuit FLC. As a result, from the light emission control circuit FLC, the xenon tube Xe is
A trigger signal for a light emission command is applied to the xenon tube Xe, and the xenon tube Xe starts generating flash light. On the other hand, as mentioned above, the one-shot circuit
The pulse output from OS ₁₃ is passed through the AND circuit AN ₂₆
is applied to the NAND circuit NA ₁ via the NAND circuit NA 1 to set the output of the NAND circuit NA ₁ to "Low". Therefore, NAND circuit NA ₁ , AND circuit AN ₂₂ , OR circuit
The one-shot circuit OS ₁₃ is connected to the terminal JB ₆ of the strobe controller FC via OR ₂₁ , AND circuit AN ₂₄ , OR circuit OR ₂₂ , and transistors BT ₆ and BT ₇ .
A "Low" pulse is input with a pulse width corresponding to . This pulse is the strobe control device
The signal is inverted by the FC inverter _IN10 and applied to one input terminal of the AND circuit _AN8 . At this time, the shutter SHT is connected to terminal _O5 of μ-com1.
The “High” signal that commands the start of the release operation has already been output, and this “High” signal
It is added to the other input terminal of the AND circuit _AN8 . Therefore, a "High" pulse is output from the AND circuit _AN8 , and this pulse is applied to the set terminal S of the flip-flop _FF5 , and the Q output terminal of the flip-flop _FF5 becomes "High".
is set to Q of this flip-flop FF ₅
The “High” signal at the output terminal is applied to one input terminal of the AND circuit AN ₉ , and is also applied to the base of the transistor BT ₄ ,
BT ₄ is turned off. On the other hand, a photometry signal representing the film surface photometry result based on the strobe light is applied to the transistor BT ₃ from the operational amplifier OA ₁ of the photometry circuit ME shown in FIG. 3, and the collector of this transistor BT ₃ is
A collector current flows in accordance with the intensity of the strobe light on the film surface of the camera device. The collector current of this transistor BT ₃ is the capacitor C ₁
It is integrated by. The terminal _O11 is a terminal that becomes "High" in the fill-in flash mode, and becomes "Low" when the strobe device FL is used as the main light source. Therefore, fill−
In flash mode, analog switch AS ₂₀
conducts, the voltage signal from the constant voltage source CE ₂₀ is input to the comparator AC ₁ , and when the strobe device FL is the main light source, the output of the inverter IN ₄₀ becomes “High” and the analog switch AS _{twenty one}
conducts, and the voltage signal from the constant voltage source CE ₂₁ is input to the comparator AC ₁ . The ratio of the signal voltage of constant voltage source CE ₂₀ and that of CE ₂₁ is 3:4, and when converted to an apex value, CE ₂₀ has a higher
The value is 0.5E _v less. The signal voltage from the constant voltage source CE ₂₁ is a voltage corresponding to the appropriate exposure level. When the integral value of the capacitor C ₁ (i.e., the integral value of the amount of light reflected from the object illuminated by the strobe light by TTL photometry) reaches the output voltage of the constant voltage source CE ₂₀ or CE ₂₁ , the output of the comparator AC ₁ becomes The signal becomes "High" and a "High" pulse is output from the one-shot circuit _OS9 . At this time, if a signal indicating TTL mode is read in shift register SR ₁ , AND circuit AN ₉ and OR circuit
OR ₆ , strobe device FL ( _13th
A pulse is sent to terminal JF ₁ in Figure) to stop the light emission. When in fill-in flash mode, the exposure level to the film FIL is lower than the appropriate exposure level.
When the exposure level reaches a level of 0.5E _v under, the light emission is stopped.If a strobe device is used as the main light source, the light emission is stopped when the appropriate exposure level is reached.This is detailed in Figures 1 and 2. This corresponds to the case where the value of k ₁ mentioned above is set to 0.5E _v . The pulse from AND circuit AN ₈ is a timer circuit
It is also entered into TI ₁₀ . This timer circuit _TI10 outputs a "High" pulse when sufficient time has elapsed for the strobe to fully emit light after the above pulse is applied, resets the flip-flop _FF5 , turns on the transistor _BT4 , and circuit
Close the gate of AN ₉ . Furthermore, the D flip-flop _DF5 is also reset. In the strobe device FL, the “High” pulse from the one-shot circuit OS ₁₃ is processed by the AND circuit.
When output from AN ₂₆ , flip-flop FF ₁₄
is set and its Q output becomes "High".
At this time, if the changeover switch MOS is switched to the contact OU side, that is, if the external light mode is selected, the outputs of the inverters IN ₁₈ and IN ₁₉ both become "High". Therefore, the output of the NAND circuit NA ₂ becomes "Low", and this "Low" signal is applied to the base of the transistor BT ₅ , turning off the transistor BT ₅ and turning off the AND circuit AN _28.
gate will be opened. When the xenon tube Xe emits light, the output current of the phototransistor PT on the flash device FL side, which receives the reflected light from the subject via the light receiving aperture AP, is controlled by the capacitor.
It is integrated by C ₂ . When the integrated value by this capacitor C ₂ reaches a value corresponding to the film sensitivity from the variable voltage source VE ₂ , the output of the comparator AC ₂ becomes “High” and a “High” pulse is output from the one-shot circuit OS ₁₄ . . This pulse is sent to the light emission control circuit FLC via the AND circuit AN ₂₈ and the OR circuit OR ₂₄ , and the light emission of the xenon tube Xe is stopped. On the other hand, when the changeover switch MOS is switched to contact TT side and TTL mode is selected,
The output of the inverter _IN40 becomes "High" and the gate of the AND circuit _AN27 is opened. Therefore, the light emission stop signal sent from the one-shot circuit OS ₉ of the strobe control device FC to the terminal JF ₁ of the strobe device FL is input to the light emission control circuit FLC via the AND circuit AN ₂₇ and the OR circuit OR ₂₄ . xenon tube
Xe stops emitting light. The pulse for starting light emission from the AND circuit AN ₂₆ is
Also applied to timer circuit TI ₂ , this timer circuit
TI ₂ counts the time required for the xenon tube Xe to fully emit light. Then, when the time set in the timer circuit TI ₂ has elapsed, the pulse output from the timer circuit TI ₂ is applied to the reset terminal R of the flip-flop FF ₁₂ via the OR circuit OR ₁₉ .
The flip-flop FF ₁₂ is reset and the flip-flop is reset via the OR circuit OR ₂₃ .
It is applied to the reset terminal R of FF ₁₄ to reset the flip-flop FF ₁₄ . Switch SS ₁ of the strobe device FL is the contact CU
When the first mode is selected, the output of the inverter _IN15 becomes "High".
Then, when the fullness signal is output from the fullness signal output circuit CD, the AND circuit AN ₂₀ and the OR circuit
The output of OR ₂₀ becomes “High” and the AND circuit
The gate of AN ₂₆ is opened and it becomes ready to emit light. In addition, when the X contact SX is open in this state, the output of the inverter IN ₁₆ is "High", so the output of the AND circuit AN ₂₃ becomes "High",
This "High" signal is output as a fullness signal to the terminal JF ₂ via the OR circuit OR ₂₂ and the transistors BT ₆ and BT ₇ . This fullness signal is sent to the strobe control device.
In the FC, all "1" signals are read, that is, it is determined that the mode is the first mode, and the above-mentioned arithmetic operation is performed. When the X contact SX of the strobe device FL is closed,
As in the second mode, the AND circuit AN ₂₆
A pulse is output from the one-shot circuit OS ₁₃ , and this pulse is inverted by the inverter IN ₁₆ to become a "Low" pulse, and this pulse is sent from the terminal JF ₂ of the strobe device FL to the strobe control device.
The signal is input to the terminal JB ₆ of the FC as a signal indicating the start of light emission of the strobe device FL. In the camera device, when the strobe device FL side is set to TTL mode, the light emission stop signal input from the strobe control device FC is sent to the AND circuit AN ₂₇ and the OR circuit.
It is sent to the light emission control circuit FLC via _OR27 . On the other hand, when set to external light mode, the light emission stop signal from the one shot circuit OS ₁₄ is output from the AND circuit.
AN ₂₈ , light emission control circuit FLC through OR circuit OR ₂₄
, and the xenon tube Xe stops emitting light. FDC ₁ (Fig. 12) of the strobe control device FC and FDC ₂ (Fig. 13) of the strobe device FL are dimmed by the light emission stop signals from the one-shot circuits OS ₉ and OS ₁₄ , respectively. This is a display device for checking dimming that displays. In the strobe control device FC, when a signal indicating the TTL mode is read into the shift register SR ₁ , the gate of the AND circuit AN ₉ is opened, and a light emission stop signal is output, the display device FDC ₁ is activated. for a certain period of time,
A display is performed to confirm whether the light adjustment in the camera device is appropriate. On the other hand, strobe device
In FL, when the light emission stop signal is output from the OR circuit OR ₂₄ , the display device FDC ₂
As with FDC ₁ , a display is displayed for a certain period of time to confirm dimming.

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Claims (1)

[Scope of Claims] 1. A photometer for measuring subject brightness in a wide area of the photographic screen; a first aperture value output means for calculating and outputting an aperture value; a second aperture value output means for outputting a predetermined aperture value for flash photography that is determined independently of the photometry value of the photometry means; a determining means for determining whether the photometric value of the photometric means is higher than a predetermined level; and when the determining means determines that the photometric value of the photometric device is higher than the predetermined level, the first aperture value output means calculates the aperture value. a first selection means that selects an aperture value and selects a predetermined aperture value of the second aperture value output means when it is determined that the aperture value is lower than a predetermined level; and a third selection means that outputs the manually set aperture value. an aperture value output means; selectively specifying a first exposure control mode in which the aperture is automatically controlled according to the photometric value of the photometry means; and a second exposure control mode in which the aperture is controlled to a manually set value; a mode specifying means for selecting the aperture value selected by the first selecting means when the first exposure control mode is specified by the mode specifying means, and specifying the second exposure control mode; and a second selection means for selecting the set aperture value of the third aperture value output means; an aperture determining means for determining the aperture opening amount to the aperture value selected by the second selection means; flash light metering means for measuring the reflected light from the subject that has passed through the determined aperture and reflected from the film surface; A flash photography device comprising a light emission stop signal output means for outputting a signal.