JPH043531B2 - - 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 the aperture value in accordance with the brightness level of steady light of a subject. Conventional technology Conventionally, 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 the brightness level of the ambient light is below the predetermined value, the aperture value is fixed at the predetermined aperture value and the aperture value is set to the sub-subject. For example, Japanese Patent Application Laid-Open No. 56-75627 proposes a flash photography device that performs exposure control based on the amount of light reflected from the main subject when the flash is emitted. According to this device, both the main subject and the sub-subject can be controlled to approximately proper exposure when it is bright, and at least the main subject can be controlled to proper exposure when it is dark. In such conventional devices, the aperture value is fixed and controlled when the brightness is low, so as the film sensitivity increases, the amount of light emitted by the flash light emitting device decreases, making it possible to control the amount of light emitted appropriately. The effect of extending the shooting distance linkage range of a flashlight emitting device that is capable of Problems to be Solved by the Invention However, since focus adjustment is difficult when adjusting the focus manually or automatically using a known automatic focus adjustment device at low brightness, there is a high probability that an out-of-focus photograph will be obtained. Therefore, in the case of flash photography where the subject brightness is low, it is desirable to narrow down the aperture to increase the depth of focus to reduce the probability of an out-of-focus state. However, in conventional devices, the aperture is fixed regardless of the film sensitivity of the film attached to the camera, and if the film sensitivity is high and the aperture is set to a small aperture, it is possible to control the amount of light emitted appropriately. However, there was a problem in that it was not possible to change the aperture, and the only option was to take flash photography with a shallow depth of focus. This invention was made in order to solve the problems of the conventional device described above, and it is possible to automatically vary a predetermined aperture for flash photography during flash photography at low brightness, thereby adjusting the focus. An object of the present invention is to provide a flash photography device capable of reducing the probability of obtaining poor photographs. Means for Solving the Problems In order to achieve the above-mentioned object, the flash photography device of the present invention includes a constant light metering means for measuring the brightness level of the constant light of a subject, and a constant light brightness level determined independently of the brightness level of the constant light from the photometering means. , a predetermined aperture value signal output means for outputting a signal indicating a predetermined aperture value for flash photography corresponding to a fixed film sensitivity; a set film sensitivity signal output means for outputting a signal indicating the film sensitivity of the set film; An aperture value signal obtained by inputting signals from the predetermined aperture value signal output means and the set film sensitivity signal output means and changing the predetermined aperture value signal by an amount corresponding to the difference between the constant film sensitivity and the set film sensitivity. and a second aperture value for flash photography based on signals from the photometry means and the film sensitivity signal output means. a second signal output means for calculating and outputting a signal; a determining means for determining whether the brightness level of the stationary light is higher or lower than a predetermined level based on the signal from the photometric means; When it is determined that the brightness level of the light is lower than a predetermined level, a signal from the first signal output means is selectively outputted, and the determination means determines that the brightness level of the stationary light is higher than the predetermined level. a signal selection means for selectively outputting the signal from the second signal output means when it is determined; and an aperture control means for performing aperture control based on one of the aperture value signals output from the signal selection means. and,
A flash light metering means for measuring the amount of light reflected from a subject due to light emission from the flash light emitting device, and outputting a signal for stopping the light emission of the flash light emitting device when the integral value of the photometric value from the light metering means reaches a predetermined value. Third
It is characterized by comprising a signal output means. Embodiment FIG. 1 is a block diagram showing the basic configuration of the present invention. LE is an interchangeable lens and is electrically connected to the camera body via four terminals JL ₁ to JL ₄ . Terminal JL ₁ is connected to terminal JB ₁ of the camera body on the right side of the dashed line L, and the power supply from the camera body +
VL is supplied. Terminal JL ₂ is the terminal on the camera body.
Connected to JB ₂ , synchronizing pulse from camera body
CPL will be sent. Terminal JL ₃ is connected with terminal JB ₃ , and the interchangeable lens LE
Focal length information, etc. is transferred from the camera body to the camera body, and this information is input to the discrimination circuit DJ. Also, terminal JL ₄
and JB ₄ are terminals that share the ground between the lens LE and the camera body. FL is a flashlight device (hereinafter referred to as a strobe device)
It is. Terminal JF ₄ of this strobe device FL is connected to terminal JB ₈ of the camera body, so that the strobe device FL and the camera body are grounded in common. The terminal JF ₃ is connected to the terminal JB ₇ of the camera body, and a light emission start signal is inputted by closing the X contact SX. Terminal JF ₂
is connected to terminal JB ₆ of the camera body, outputs a flash photography mode signal from the strobe device FL, and this signal is input to the discrimination circuit DJ. This flash photography mode signal is output, for example, when the power switch (not shown) of the strobe device FL is closed, or when the charging voltage of the main capacitor (not shown) of the strobe device FL reaches a predetermined value. Just do it like this. Terminal JF ₁ is connected to terminal JB ₅ , and a flash stop signal based on film surface metering from the camera's flash control circuit FTT is input, and the strobe device is activated.
Stops FL emission. 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 element 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 Ev. The k ₁ Ev signal from the constant voltage source CE ₁₀ and the film sensitivity signal Sv 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 of Sv−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 flash
In 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 in which 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 Sv from the film sensitivity signal output circuit SS is transmitted to the transistor BT _20. input to the base of A circuit consisting of transistors BT ₂₀ , BT ₂₁ and resistor R ₁₅ is applied to the base of transistor BT ₂₀ .
This circuit converts the signal Sv or Sv- _k1 into a signal representing 2 ^Sw or 2 ^Sv-k1, respectively, and the converted signal voltage is applied to the inverting input terminal of the comparator _AC10 . The output of the operational amplifier OA ₁₀ is given to the non-inverting input terminal of the comparator AC ₁₀ . When the X contact SX is closed, the strobe device FL starts emitting light and the analog switch AS ₁₀ 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 subject brightness level is high and the flash device FL is in fill-in flash mode, the flash output is controlled so that it is under-exposure by k ₁ Ev, and when the subject brightness level is low and the flash device is in the fill-in flash mode. When used as a main light source, the amount of light emitted is controlled to achieve proper exposure. That is, 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 depends on the photometric map of the photodetector PD ₀ , the ratio of the main subject to the entire shooting screen, the illumination characteristics of the strobe device, etc., but it is determined by shooting in many situations to determine the best value. It is sufficient to experimentally determine a value with fewer failures during actual shooting, and then set this value at the time of camera manufacture.
Usually, this value is on the order of 0≦k ₁ ≦1.5, for example. 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, if the focal length of the interchangeable lens attached to the camera is 30 mm or less, set terminal d ₁ to "High," and if the focal length is between 30 mm and 55 mm, set terminal d ₂ to "High."
When 56mm to 120mm, set terminal d ₃ to “High” and set 121
When it is more than mm, 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), and FA ₃ outputs a signal of Av = 5 (F5.6). Av=4
(F4) and FA ₄ output signals of Av=3 (F2.8), respectively. FT ₁ to _{FT 4} are circuits that output exposure time signals that limit camera shake. For example, FT ₁ has Tv=5 (1/
FT ₂ outputs a signal of Tv=6(1/30sec).
60sec), FT ₃ is Tv = 7 (1/125sec), FT ₄ is Tv
=8 (1/250sec) signal is output. Note that the signal of Tv=8 from FT ₄ corresponds to the exposure time of the flash photography synchronization limit. MP ₁₀ is a data selector, and when the terminal d ₁ of the discrimination circuit DJ becomes "High", the signal from the signal output circuit FA ₁ is sent to the data output terminal γ ₁ , and the signal from the signal output circuit FT ₁ is sent to the data output terminal γ _2. Output each. When terminal d ₂ becomes “High”, the signal from FA ₂ is output to γ ₁ and the signal from FT ₂ is output to γ ₂ , and when d ₃ is “High”, the signals from FA ₃ and FT ₃ are output to γ ₁ respectively. ,γ ₂
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, 1/30sec at F5.6 for 31mm to 55mm
60sec is 56mm to 120mm, 1/125sec at F4,
If it is 121mm or more, 1/250sec at F2.8 will be output as the aperture value and exposure time for flash photography. 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 in 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 Sv, and FXD is a circuit that outputs a signal corresponding to Sv=5 (ISO100). The signals from these two circuits SS and FXD are input to the subtraction circuit SUB, where the calculation of Sv-5=△Sv is performed, and the set film sensitivity and
The difference from the film sensitivity of ISO100 is calculated. The difference signal △Sv calculated by this subtraction circuit SUB
and the aperture value signal from γ ₁ of the data selector MP ₁₀ are input to the adder circuit ADD, and the calculation Avf ₅ +ΔSv=A′vf is performed. Here, the data selector
The aperture value signal Avf ₅ from MP ₁₀ 's γ ₁ 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 settings for flash photography or the signal of the calculated aperture value A'vf from the data selector MP ₁₁ are input to the arithmetic circuit 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 , and Bv+Sv+k ₂ The calculation -A'vf=Tva is performed to calculate the exposure time Tva. Note that the constant k ₂ Ev is determined by the calculation circuit as described later.
Set in ALU ₁ . Here, the above calculation results in underexposure by k ₂ Ev 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 higher in brightness than the output of the photodetector by k ₂ Ev according to the photometric map of the photodetector, then the aperture value A′vf from the data selector MP ₁₁ The exposure time Tva 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 Tva mentioned above, the main subject will be properly exposed by the strobe device, while the sub-subject will be more normally exposed than the main subject. Proper exposure can be obtained using only constant light for a sub-subject that is far away and in the surroundings of the photographic field, so that the light from the strobe device does not reach it. Note that the value of k ₂ Ev is determined based on a large amount of data collected on the difference between the output of the average metering photodetector and the brightness of the sub-subject at that time when many fill-in flash shots are taken. By determining a predetermined value that satisfies the above-mentioned exposure and setting this value at the time of camera manufacture, fill-in flash photography can be performed without failure in most situations. CMP ₁
is a comparison circuit that compares the exposure time signal Tva from the arithmetic circuit ALU ₁ and the exposure time signal Tvh of the camera shake limit according to the focal length of the lens from γ ₂ of the data selector MP _10. When Tva<Tvh, “ Low”,
If Tva≧Tvh, a “High” signal is output. On the other hand, CMP ₂ is a comparison circuit that compares the above-mentioned exposure time Tva with the tuning limit exposure time Tvx from the exposure time signal output circuit FT ₄ , and if Tva≦Tvx, it is “High”;
If Tva > Tvx, outputs a “Low” signal. MP ₁₂ is a data selector that receives the signal Tva from the arithmetic circuit ALU ₁ , the signal Tvh from γ ₂ of the data selector MP ₁₀ , and the signal from the exposure time signal output circuit FT _4.
Tvx is input, and one of Tva, Tvh, and Tvx is output as an exposure time signal Tvf for flash photography according to the outputs of the comparison circuits CMP ₁ and CMP ₂ . First, Tva
＜Tvh, the comparison circuit CMP ₁ is “Low”,
When CMP ₂ outputs a "High" signal, data selector MP ₁₂ outputs an exposure time signal Tvh at the camera shake limit from terminal γ ₂ of data selector MP ₁₀ . Next, if Tvh≦Tva≦Tvx, the comparison circuit
The outputs of both CMP ₁ and CMP ₂ become "High", and the data selector MP ₁₂ outputs the exposure time signal Tva from the arithmetic circuit ALU ₁ to properly expose the sub-subject. Also, when Tvx<Tva, the comparator circuit CMP ₁
The output of CMP 2 becomes "High", the output of CMP ₂ becomes "Low", and the data selector MP ₁₂ outputs the tuning limit exposure time signal Tvx from the exposure time signal output circuit FT ₄ . Arithmetic circuit ALU ₂ inputs object brightness Bv from photometric signal output circuit BDO, set film sensitivity Sv from set film sensitivity signal output circuit SS, and exposure time Tvf from data selector MP ₁₂ , and calculates Bv+Sv+k ₂ −Tvf=Ava. The aperture value Ava at which the sub-subject will be properly exposed is calculated. This signal is the data selector
Applied to one input terminal of MP ₁₃ . The aforementioned aperture value signal A'vf from the data selector MP ₁₁ is applied to the other input terminal of the data selector MP ₁₃ . When the signal from the comparator circuit CMP ₂ is “High” with Tva≦Tvx, 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. Output as aperture value Avf, while from comparison circuit CMP ₂
When Tva>Tvx and a "Low" signal is output, the fill-in flash aperture value Ava from the arithmetic circuit ALU ₂ is output as the control aperture value Avf. Here, the aperture value Ava is output from the data selector MP ₁₃ when the tuning limit exposure time Tvx is output from the data selector MP ₁₂ as the control exposure time Tvf, so it is ultimately calculated by the arithmetic circuit ALU ₂ and used for control. The aperture value Ava output for use is the aperture value determined by Bv+Sv+k ₂ −Tvx=Ava. Control aperture value Avf and exposure time Tvf explained above
The output method can be summarized as follows. First, the camera shake limit exposure time depending on the focal length
The aperture value corresponding to Tvh, focal length, and film sensitivity or the set aperture value A′vf is output for control because the exposure time Tva calculated by Bv+Sv+k ₂ −A′vf=Tva is Tva<Tvh This is the case where Bv+Sv+k ₂ <Tvh+A′vf. Next, Tva determined by the above calculation
and A′vf are output when Tvh≦Tva≦Tvx, that is, Tvh+A′vh≦Bv+Sv+k ₂ ≦Tvx+A′vf. Further, the aperture value Ava determined from the tuning limit exposure time Tvx and Bv+Sv+k ₂ −Tvx=Ava is output for control when Tva>Tvx, that is, when Tvx+A′vf<Bv+Sv+k ₂ . Furthermore, if Tvh≦Tva, that is, Tvh+A′vf≦Bv+Sv+k ₂ , Tva or
Ava determined based on Tvx is output, and the exposure time Tva or aperture value that makes the secondary subject also properly exposed
Ava is output and the strobe device becomes the fill-ih flash mode as an auxiliary light source. When Tvh > Tva, that is, Tvh + A′vf > Bv + Sv + k ₂ , Tvh and A′vf are output and the normal strobe device is used. This mode is used as the main light source. 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 Tvf from the data selector MP ₁₂ is sent to the shutter control circuit CT.
Exposure time control corresponding to TVF is performed. Further, this Tvf is sent to the display section DPT to display the exposure time. Also, data selector MP ₁₃
The control aperture value signal Avf from the aperture control circuit
It is sent to CA and aperture control corresponding to Avf is performed. Furthermore, this Avf is sent to the display section DPA to display the aperture value. Arithmetic circuit ALU ₃ receives subject brightness Bv from photometric signal output circuit BDO, setting film sensitivity Sv from setting film sensitivity signal output circuit SS, exposure time Tvf from data selector MP ₁₂ , and data selector
Input the aperture value Avf from MP ₁₃ , calculate Bv + Sv + k ₂ - (Tvh + Avf) = △Ev, and this △Ev signal is sent to the display DPD.
sent to. This △Ev becomes 0 when Tva or Tvx is output, that is, in fill-in flash mode, and when Tvh is output, that is, when a strobe device is used as the main light source, it depends on how much the subject is. Displays whether the exposure will be underexposed. moreover,
The photographer should fill-in when the display DPD reaches 0.
Goes to 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 controller 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
TV is input. The exposure time control device CT generates a signal representing the time corresponding to this data Tv (that is, the time 2 ^-Tv from opening to closing of the shutter) based on the clock pulse CP.The exposure time is controlled by this signal. The controller CA has μ−
Data ΔAv representing the calculated or set number of refinement 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 that are input from the PG as the aperture ring rotates, and compare this count value with the data ΔAv 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 operational amplifier OA ₁ in FIG. 3 is Bv+Sv-Avo.
Here, Bv is the subject brightness, Av ₀ is the open aperture, and Sv
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.
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 Bv + Sv - Av. 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 OA, the analog photometric signal Bv+Sv-Avo from operational amplifier _OA1 is converted into a digital signal based on the clock pulse CP. This A-D converted data
Bv+Sv−Avo is the input terminal of data selector MP ₁
Given to IP ₂ . The set aperture value signal output device AS outputs data Avs−Avo according to the setting position of the aperture setting ring (not shown) of the lens LE to the input terminal of the data selector MP ₁ .
Output to IP ₃ . 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 read sequentially according to the 4-bit data from output terminal _0P3 of
It is input to the μ-com1 via the data selector _MP1 and the external data bus DB of the μ-com1. An example of a specific circuit of this 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 0 of μ-com1
Based on the 4-bit data applied from P ₃ to the selection terminal SL, the data input to input terminals IP ₁ to IP ₇ is sent to μ-com 1 via data bus DB.
Enter. 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】

[Table] As shown in Table 2 above, if the data of output terminal 0P ₃ is “ _OH ”, the set exposure time data Tvs from input terminal IP ₄ is “1 _H ”, then the data from (IP ₅ ) is If the film sensitivity data Sv is "2 _H ", the exposure control mode data from IP ₆ is used, "3 _H " is the photometric value data from IP ₂ , and "4 _H " is the flash data from (IP ₇ ). If the data is “5H”, the data of the setting narrowing stage number Avs−Avo from IP ₃ is
It is imported into μ-com1 via the DB. Also,
When the data at the output terminal _0P3 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 in accordance with the data from "6 _H " to "D _H " input from the output terminal 0P3, respectively. Output to (IP ₁ ). Also, in μ-com1,
When the lens mounting switch LS is not closed and input terminal _i1 is “Low”, output terminal _0P3 outputs “O _H ”.
Only data from “4H” to “ _4H ” is output, and the lens
Data related to LE is not read into μ-com1. The switch RS is closed when a relay release button (not shown) is pressed, and opened when the relay 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 becomes "High" when starting the exposure control operation, and this "High" signal causes the release circuit RL connected to the terminal _O5 to perform the release operation of the exposure control mechanism. . Also, μ−
The output terminal _O5 of 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", transistor BT ₂ becomes conductive, and the circuit LEC on the lens LE side is connected from the power line +VB to the power line +VL, terminal JB ₁ on the camera body side, and terminal JL ₁ on the lens side. Power is supplied to the In the circuit LEC on the lens LE side,
ROM that permanently stores various lens data
(RO) (described later) is built-in. The clock pulse CPL output from the interface circuit IF on the camera body side is input to the lens side circuit LEC via the camera body side terminal JB ₂ and the lens side terminal JL ₂ , and this clock pulse CPL is used as a synchronization signal. Between the interface circuit IF and the lens side circuit LEC, the address signal and data signal of the ROM (RO ₁ ) are alternately transmitted via the signal line SB, the terminal JB ₃ on the camera body side, and the terminal JL ₃ on the lens side. will be delivered to. 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, an operation command pulse is given to the A-D converter AD, 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 " _OH " is set in the data register DR in the memory, and this data is output to the output terminal _0P3 . At this time, as shown in Table 2 above, the exposure time data Tvs input to the input terminal IP ₄ is output from the data selector MP ₁ , and this data is sent to a predetermined register in μ-com 1 via the data bus DB. is loaded into. 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
If the contents of DR have 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 " _5H ". If the content of data register DR is “1 _H ”, film sensitivity data
Sv is read, and if " _2H ", 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 Bv+Sv-Avo representing the brightness of the subject is input to the input terminal _IP2 of the data selector _MP1 . And this data Bv + Sv − Avo
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 inputted to the input terminal IP ₇ of the data selector MP ₁ via the strobe control circuit FC is
-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", the interchangeable lens LE is switched off in steps after step #29, as will be described in detail later.
Exposure calculation is performed when the camera is not attached.
In step #18, 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 _0P3 , and based on this data "5 _H ", data representing the number of set refinement stages is input to the input terminal _IP3 of the data selector _MP1 . Avs-Avo is sent to the data bus DB. Then, in step #20, the data Avs-Avo 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 _0P3 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 _0P3 is “6 _H ”, it is the check data, “7 _H ” is the open aperture value data Avo, and “8 _H ” is the maximum aperture value data.
Avm, “9 _H ”, minimum focal length data fw, “A _H ”
If so, the longest focal length data ft, “B _H ” will be explained later.
Bv∞ data, “C _H ” set shooting distance data
Dv, " _DH ", 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 , respectively. moreover,
These data are sequentially transferred to data selector MP ₁ .
is output to the data bus DB. In this way, the μ-com 1 repeats the operation of fetching the various data described above from the data selector MP ₁ via the data bus DB. And μ-com1 is
When all the data mentioned above have been taken in 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 process moves to the next 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, the 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,
Alternatively, this corresponds to when a camera accessory such as an intermediate ring or bellows is attached between the lens and the camera body. 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 explained. 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 .
When any input is made, the strobe device 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-Avn. Here, Avn is the effective aperture value. Next, according to the formula below, the exposure time Tvc
is calculated. (Bv−Avn)+Sv=Tvc Exposure time Tvc 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 ΔAv is 0, the photographic aperture device APL does not aperture the image, 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 ΔAvf is set to 0. The exposure time Tvf 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 Tvs 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 Tvf.
Further, when the set exposure time Tvs is longer than the time corresponding to the tuning limit, the set exposure time Tvs is determined as the exposure time Tvf 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. (Bv+Sv-Avo)+Avo=Ev (1) Next, the following calculation is performed depending on what exposure control mode is set in the exposure control mode setting device (not shown) of the camera. First, in the program mode (hereinafter referred to as P mode), the following calculation is performed: p·Ev=Av (0<p<1) (2). When Avo≦Avc≦Avm (Avo: open aperture value, Avm: maximum aperture value), use this calculated aperture value as the aperture control value for constant light photography Avc, and calculate Ev−Av=Tv……(3) and set this exposure time as the exposure time control value Tvc for constant light photography. Also, when Av<Avo, calculate Ev−Avo=Tv (4) using Avo as the control value Avc, and calculate the exposure time Tv<
When Tvmin, an under warning is given by setting Tvmin (Tvmin; maximum exposure time) as the control value Tvc.
When Tv≧Tvmin, Tv calculated by equation (4) is set as the control value Tvc. Furthermore, the aperture value calculated by formula (2)
When Av>Avm, Avm is set as the control value Avc, and the calculation Ev−Avm=Tv...(5) is performed, and when Tv>Tvmax (Tvmax: shortest exposure time), an over warning is issued and
Let Tvmax be the control value Tvc. On the other hand, Tv<
When Tvmax, Tv calculated by equation (5) is the control value
Tvc. When in the aperture-priority exposure time automatic control mode (hereinafter referred to as A mode), the set aperture value Avs is determined by (Avs-Avo)+Avo=Avs...(6), and then Ev-Avs=Tv... Perform the calculation in (7) to calculate the exposure time. When Tvmin≦Tv≦Tvmax, the set aperture value Avs and the exposure time Tv calculated by equation (7) are set as control values Avc and Tvc. On the other hand, when Tv<Tvmin, Tvmin is set as the control value Tvc, and the calculation Ev−Tvmin=Av...(8) is performed, and when Av≧Avmin, the aperture value calculated by equation (8) is used as the control value Avc. shall be. Also, Av
When <Avmin, an under warning is issued using Avmin as the control value Avc. Furthermore, the exposure time Tv calculated by equation (7) is Tv＞
When Tvmax, then the following calculation is performed using Tvmax as the control value Tvc: Ev-Tvmax=Av (9). And when Av＞Avm,
Avm is set as the control value Avc to issue an over warning, while when Av≦Avm, the aperture value Av calculated by equation (9) is set as the control aperture value Avc. In exposure time priority automatic aperture control mode (hereinafter referred to as S mode), calculate Ev−Tvs=Av (10), and when Avo≦Av≦Avm, set exposure time Tvs and (10 Let the aperture value Av calculated by the formula ) be the control values Avc and Tvc. When Av<Avo
Using Avo as the control value Avc, calculate Ev−Avo=Tv (11). When Tv≧Tvmin, Tv calculated by equation (11) is set as the control value Tvc, and Tv
When <Tvmin, Tvmin is used as the control value and an under warning is issued. On the other hand, calculated using equation (10)
When Av>Avm, Avm is the control value Avc
As Ev=Avm(=Avc)=Tv...(12) Then, when Tv>Tvmax,
An over warning is given using Tvmax as the control value Tvc. Furthermore, when Tv<Tvmax, Tv calculated by equation (12) is set as the control value Tvc. In the manual setting mode (hereinafter referred to as M mode), the set Avs and Tvs are used as control values Avc and Tvc, and then Ev-(Avc+Tvc)=ΔEv (13) is calculated. At step #37, when the calculation for one of the following setting modes is completed, the following calculation is performed: Avc-Avo=ΔAvc (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: (Bv - Avo) + Sv + Avo = Ev (15). Next, in step #102, the mode set on the strobe side is set to TTL based on the data from the strobe device FL. mode or external light mode. Then, if it is TTL mode, go to step #103, and if it is outside light mode, go to step #11.
Move to step #201 in the diagram. 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 film sensitivity Sv = 5.
6 (F8) (W ₁ in Fig. 7) is set as the aperture value Avf ₅ corresponding to this case. Then, in #106, the tuning exposure time Tvf is set to 5 (1/30 sec) (W ₁ in Fig. 7). When the focal length is longer than 30mm,
In step #107, determine whether it is within the range of 31mm to 55mm. And when it's in this range
Set Avf ₅ to 5 (F5.6) (Fig. 7 W ₂ ),
Set 6 (1/60sec) (W ₂ in Fig. 7) as Tvf. 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, Avf ₅ = 4 (F4), If Tvf=7 (1/125sec) (T ₁ in Figure 7) and the focal length is 121mm or more,
Move to step #113, Avf ₅ = 3 (F2.8),
Tvf = 8 (1/250sec) (T ₂ in Figure 7), #115
Each step will be moved to the next step. In step #115, the calculation Sv-5=△Sv (16) is performed, and in step #116, the calculation Avf ₅ +△Sv=Avf (17) is performed. In this way, if the film sensitivity changes to, for example, a high sensitivity side by determining Avf, the amount of light incident on the film due to the appropriate strobe light will be small, so narrow down the aperture as much as possible within the constant strobe interlocking range. You can do it like this. Therefore, the depth of focus can be made as deep as possible during strobe photography. In addition, if the film sensitivity deviates from Sv=5,
The aperture is narrowed down by the deviation value △Sv, so
The strobe linkage range does not change. In step #117, it is determined whether the Avf obtained based on equation (17) in step #116 is Avf<Avo, and if Avf<Avo, Avo is photographed with a strobe in step #118. Aperture value
Avf. If it is determined in step #117 that Avo≦Avf, then Avm is determined in step #119.
＜Determine whether it is Avf. Then, if Avm<Avf, let Avm be Avf, and Avm
If ≧Avf, it was calculated in step #116.
Move to step #121 using Avf as the aperture value for flash photography. In step #121, it is determined whether Avf+Tvf≧Ev+1...(18). If formula (18) is satisfied, proceed to step #131; if not, proceed to step #122. Move to step. The value of Ev corresponding to this switching point is Ev=10 in the example of FIG. Then, as shown in FIG. 7, if Ev<10, the process moves to step #131 with Avf and Tvf remaining at the values determined as described above. On the other hand, when Ev≧10, as shown in FIG. 7, after calculating Avf and Tvf corresponding to Ev by the method described later, the process moves to step #131. In step #122, the following calculation is performed: Ev+1-Avf=Tva (19), and in step #123, it is determined whether Tva>8. Then, when Tva≦8, in step #130, Tva obtained by equation (19) is set as the control exposure time Tvf, and the process moves to step #131. In the example of Figure 7, if W ₁ , this means 10
Range of ≦Ev≦13, range of 10≦Ev≦12 for W ₂ ,
If T ₁ , it corresponds to the range of 10≦Ev≦11. on the other hand,
When Tva > 8, step #124 returns 8 (1/
250sec) as Tvf, calculate Ev+1-Tvf=Ava (20). Then, if Ava≦Avm, the process moves to step #131 using Ava calculated by equation (20) as the strobe photography aperture value Avf. on the other hand,
If Ava>Avm, an over warning is issued on the display device OE shown in FIG. 3, and Avm is set as the control aperture value Avf, and the process moves to step #131. The part corresponding to steps #124 to #129 is _W1 in Figure 7.
If Ev≧13, if W ₂ then Ev≧12, if T ₁ then Ev≧
11, T ₂ corresponds to the area where Ev≧10. In the above explanation, based on the value of Ev+1
Ava and Tva are calculated using the value of k ₂ explained in FIG. 1 as 1Ev.
In this example, _k2 is set to 1Ev, but it may be determined to be an appropriate value within the range of 0Ev to 2Ev. Next, the exposure calculation operation in S mode will be explained with reference to FIG. In Figure 8, the solid line is Tvs = 3
(1/8sec), the broken line is Tvs=6
(1/60sec), the dashed line indicates Tvs=
This corresponds to setting 8 (1/250sec). 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 Tvs≦8. When Tvs≦8, Tvs is set as the control exposure time Tvf and the process moves to step #154. On the other hand, when Tvs>8, Tvf is set to 8 in step #153 and the process moves to step #154.
In step #154, Ev+1-Tvf=Ava (21) is calculated to calculate the control aperture value Ava. If Ava<Avo in step #155, the process moves to step #156, and if Ava≧Avo, the process moves to step #158. Ava calculated based on formula (21) in step #155 is Ava<
If Avo is set, Avo is determined as the control aperture value Avf in step #156, and the display device shown in Figure 3 is displayed.
After issuing an under warning by the UE, proceed to step #131. In the embodiment shown in FIG. 8, this corresponds to the region where Ev<3 in the case of the solid line, Ev<6 in the case of the broken line, and Ev<8 in the case of the dashed-dotted line. If it is determined in step #155 that Ava≧Avo, the process moves to step #158. and,
In step #158, it is determined whether Ava>Avm. When it is determined that Ava≦Avm, in step #165 (21)
The aperture value Ava calculated by the formula is determined as the control aperture value Avf, and the process moves to step #131. This operation is
The process is performed in the range of 3≦Ev≦11 when shown by the solid line in FIG. 8, 6≦Ev≦14 when shown by the broken line, and 8≦Ev≦16 when shown by the dashed line. On the other hand, in step #158, Ava>Avm
If it is determined that this is the case, in step #159, Avm is determined as the control aperture value Avf, and in step #160, the following calculation is performed: Ev+1-Avf=Tva (22). Thereafter, in step #161, it is determined whether Tva>8. When Tva≦8, the process moves to step #162, and in this step #162, the Tva calculated by equation (22) is
is set as the control exposure time Tvf, and then the process moves to step #131. This corresponds to the region of 11≦Ev≦16 as shown by the solid line in FIG. 8, and 14≦Ev≦16 as shown by the broken line. In addition,
In the case indicated by a dashed line, the corresponding area does not exist. On the other hand, if Tva>8, the process moves to step #163, where the control exposure time Tvf is set to 8 (=1/250 sec), and
An over warning is given by the display device OE shown in Fig. 3. After that, move on to step #131.
This means that in the case shown in FIG.
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 less than 30mm, move to step #172 and set the exposure time Tvf, which represents the control target value, to 5.
(1/30sec). 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, proceed to step #174 and set the exposure time Tvf to 6 (1/60 sec). 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 Tvf 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 of
250sec). After performing the above-described operations, in step #178, it is determined whether Avs+Tvf≧Ev+1 (23) is satisfied. When formula (23) is satisfied, the aperture value Avs set in step #179 is used as the control target aperture value.
Define Avf and move to step #131. This operation is performed in the example shown in Figure 9.
In the case of W ₁ , Ev≦9, in the case of W ₂ , Ev≦10,
In the case of T ₁ , Ev≦11, and in the case of _T2 , Ev≦12. On the other hand, if it is determined in step #178 that equation (23) is not satisfied, the process moves to step #180, where the following calculation is performed: Ev+1-Avs=Tva (24). Thereafter, in step #181, it is determined whether Tva>8. If it is determined in step #181 that Tva≦8, 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 area where the above operation is performed is 9<Ev≦12 in _W1 in FIG. 9, and 10<Ev≦ in _W2.
12, in the region of 11<Ev≦12 at _T1 .
Note that at _T2 , there is no region in which the above operation is performed. In step #181, if it is determined that Tva>8, the process moves to step #182, where the exposure time Tvf is set to 8. Thereafter, the process moves to step #183, and in this step #183, the following calculation is performed: Ev+1-Tvf=Ava (25). And in step #184,
It is determined whether the above-mentioned calculated Ava satisfies Ava>Avm. #187 when Ava≦Avm
In the step, the value calculated by equation (25)
Ava is set as the control target aperture value Avf, and the process moves to step #131. The above operation is 12 in Figure 9.
It is carried out in the region of <Ev≦16. On the other hand, when Ava > Avm, in step #185, Avm is determined as the control aperture value Avf, and then, in step #186, an over 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 Tvs≦8. When Tvs>8, Tvf is set as 8,
When Tvs≦8, Tvs is set as Tvf, and in the next step #193, Avs is set as Avf,
Thereafter, the process moves to step #131 in FIG. 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 Tvs>8. Tvs>
8, the control exposure time Tvf representing the control target value is set to 8, and when Tvs≦8, the control exposure time Tvf is set to the above Tvs. Next, in step #205, the control aperture value Avf is determined to be the set aperture value Avs, 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 Tvf 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 Tvf is set to 6, and #213
Move on to the next step. 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 Tvf 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 Tvf is determined to be 8 in step #212, and step #213 is performed. to move to. In step #213, the strobe device FL
Avf data is obtained based on the data input from , and in step #214 it is determined whether Avf<Avo. When Avf<Avo, the control aperture value Avf is determined to be Avo, and the process moves to step #218. On the other hand, in step #214 above, Avf≧
If it is determined to be Avo, the next step #216
It is determined whether Avf>Avm. When Avf>Avm, the control aperture value Avf is set to Avm and the process moves to step #218. When Avf≦Avm, the process immediately moves to step #218. In step #218, the following calculation is performed: Ev+1-Avf=Tva (26). Next, in step #219, it is determined whether Tva>Tvf, and if Tvf≧Tva, the process further advances to step #131. On the other hand, when Tva>Tvf, the process moves to step #220. In step #220,
It is determined whether Tva≦8, and if Tva>8, the process moves to step #222, and the control exposure time is
Set Tvf as 8 and move to step #131. When it is determined in step #220 that Tva≦8, in step #221, the control exposure time Tvf is determined to be Tva calculated by equation (26), and the process moves to step #131. do. 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 tuning limit exposure time, the control exposure time Tvf is set to the subject brightness. The exposure time shall be determined accordingly. On the other hand, when the exposure time determined according to the subject brightness is outside the above-mentioned range, the control exposure time Tvf is determined as the exposure time determined according to the focal length or the exposure time of the tuning limit. In step #131 in Fig. 10, the maximum light amount data Ivmax based on the data from the strobe is
Based on the film sensitivity Sv and the distance data from the lens Dv, the following calculation is performed: Ivmax + Sv - Dv = Avd (27) to calculate the interlocking limit aperture value Avd for flash photography. Then, in step #132, it is determined whether Avf>Avd,
When Avf>Avd, the control aperture value Avf is smaller than the interlocking limit aperture value Avd and the amount of light emitted is insufficient, so the process moves to step #133. On the other hand, when Avf≦Avd in step #132, the control aperture value Avf is set to an aperture value that is more open than the interlocking limit aperture value Avd, so there is no shortage of light output. , the process moves to step #138 without issuing an out-of-linkage warning. If it is determined in step #132 that Avf>Avd, the following calculation is performed in step #133: (Avf+Avd)/2=...(28), and the calculated aperture value Avf and the interlocking limit aperture value Avd are calculated. An intermediate aperture value is calculated, and an out-of-interlock warning is issued on the display device RA shown in FIG. Next, in step #135, it is determined whether <Avo or not. If <Avo, Avo is set as the control aperture value Avf, and if ≧Avo, the control aperture value is set as Avf, and the process moves to step #138. In step #138, the following calculation is performed: Ivmax+Sv-Avf=Dvmax (29-1). Further, in step #139, the following calculation is performed: Ivmin+Sv-Avf=Dvmin (29-2). Both formulas (29-1), (29-2)
Accordingly, the longest interlocking distance Dvmax and the shortest interlocking distance Dvmin for the control aperture value Avf are calculated. As described later, these data Dvmax and Dvmin are sent to the strobe device FL via the strobe control device FC, and in the strobe device FL, the strobe device FL is controlled based on the signal from the light receiving element PD ₁ on the camera body side. Displays that flash photography will be performed in so-called TTL mode, which controls the amount of light emitted by the camera. Here, Ivmin is data indicating the minimum light emission amount in the above-mentioned 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 Ivmin may also be read out. Next, in step #140, the number of aperture stages ΔAvf of the photographic aperture device APL is calculated according to the following formula. Avf−Avo=ΔAvf (30) In step #141, the exposure deviation value ΔEv is calculated according to the following formula. (Ev + 1) - (Avf + Tvf) = △Ev ...... (31) The calculated deviation value △Ev is displayed on the display section DP ₁ in Figure 3.
Displayed in . The deviation value ΔEv indicates how much the sub-subject deviates from the proper exposure when performing strobe photography. In step #142, it is determined whether ΔEv calculated in step #141 satisfies ΔEv≧0. If ΔEv≧0, that is, Ev≧10 in FIG. 7, the fill-in flash mode is set, so the terminal _O11 is set to “High” and the process moves to step #145. On the other hand, if it is determined in step #142 that △Ev<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 in step #145. Move to 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 Dv from the lens matches the longest photographing distance data Dv∞ from the lens.
Here, the longest shooting distance data Dv∞ is the shooting distance data Dv at a position one scale before the infinity position.
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 Dv≧Dv∞ 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 Dv<Dv∞, the process directly proceeds to step #37 in FIG. The above is an explanation of the strobe calculation operation in step #36 of FIG. In addition, 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. Incidentally, although FIGS. 10 and 11 do not explain the case where such a warning does not need to be issued, when there is no need to issue a warning, the terminals O ₁ , O ₂ , O ₃ , O ₄ It is necessary to output a “Low” signal. If this is not done, problems may 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, it is determined that the camera device is set to flash photography mode, and that the control exposure time Tvf, control aperture value Avf, and exposure error △Ev in the exposure control mode are input.
is displayed on display device DP ₁ . Next, the terminal _O10 is set to "High", and the distance Dvmax and the distance corresponding to the maximum and minimum interlocking limits calculated in steps #138 and #139 are
Sending of data representing Dvmin from the strobe control device FC to the strobe device FL begins, and terminal i ₅
Wait for a “Low” signal to be input. Strobe device with the above data Dvmax, Dvmin
When sending to FL is completed, terminal _i5 is “Low”
Then, move to the next step #42 and connect terminal O _10.
is set to “Low” and the process moves to step #44. In step #38 above, the fullness signal is μ-
If it is determined that no input has been made to com1, the process moves to step #43, where the camera device is set to shoot in constant light mode, the exposure control mode at the time of shooting, control exposure time Tvc,
The control aperture value Avc and the exposure error ΔEv are displayed on the display device _DP1 in FIG. 3, and the process moves to the next step #44. 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 smooth CS has been completed.
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 photometry switch MS is opened and the above-mentioned fixed time period 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 of operation μ-com 1 is in, when it receives 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 stages △ when performing the strobe device calculated in step #30 or #36 is determined.
Data representing Avf is output from output port _OP2 to the aperture control device CA. Then, in the next step #61, the exposure time data Tvf 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 Avc and data representing exposure time data Tvc are output from output ports _OP2 and _OP1 , 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 the operation. 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 △Avc from the output terminal _OP2.
Alternatively, when the value matches the numerical value of the data representing ΔAvf, 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 circuit 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 is finished running, the accidental exposure prevention switch is activated.
CS is opened, and as shown in FIG. 4, the reflection mirror MR is lowered, and the exposure operation is completed with the aperture aperture of the photographic diaphragm device APL set to the open aperture. When the above exposure control operation is completed, the accidental exposure prevention switch CS is released, 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 The 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, interrupt terminal
It is impossible to accept interrupt signals to it,
Return to start. If the photometry switch MS is closed at this time, data reading, calculation, and display operations 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 BT ₈
is applied to the base of the transistor BT8, the transistor _BT8 becomes conductive, and the booster circuit DD operates. In addition, the above-mentioned "High" pulse is applied to the timer circuit TI ₁ from the terminal JF ₁ of the strobe device FL, and this timer circuit TI ₁
For a predetermined period of time after receiving the above pulse, for example,
Outputs a pulse when 0.5 seconds have elapsed. The pulse output from this timer circuit TI ₁ is an OR circuit
The signal is input to the reset terminal of flip-flop FF ₁₁ via OR ₁₄ , and the flip-flop FF ₁₁ is reset, and the Q output of flip-flop FF ₁₁ becomes "Low", and this "Low" signal is sent via OR circuit OR ₁₈ . applied to the base of transistor BT ₈ , turning off transistor BT ₈ . Therefore, booster circuit DD stops operating. This timer circuit _TI1 is reset and performs a predetermined clock 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 amplifier circuit AN 24, and the output of the amplifier circuit AN ₂₄ 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. Thus, 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 above 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 transistor through 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-described 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
Each 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 CO ₃ counts the pulses DP input from the terminal JB ₅ of the strobe control device FC to the terminal JF ₁ 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] 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 to determine whether the TTL mode or the external light mode described below is selected. 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 TTL mode is selected in the strobe device FL, inverter IN ₁₃ outputs a "High" signal, the switch MOS is closed to the contact OU side, and the external light mode is selected. When the inverter
IN ₁₃ outputs a “Low” signal. The output signal of this inverter IN ₁₃ is input from the terminal JF ₂ of the strobe device FL to the terminal JB 6 of the strobe control device FC in the same manner as the above-mentioned fullness signal, and is further inputted to the terminal JB ₆ of the strobe control device FC. and circuit
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 signal representing the maximum light emission amount Ivmax of the FL is input. The signal representing this maximum light emission amount Ivmax is
Similar to the operations 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 signals 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 Ivmax.

[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 Ivmax 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 Av.

[Table] Setting aperture value output from the above decoder DE ₄
The signal representing Av 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 _FF11 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 Ivmax and the set aperture value Av input to JB ₆ into the shift register SR ₁ is stopped. Also, flip-flop
The “Low” signal of the Q output terminal of FF ₁ is μ-com1
input terminal _i6 . By this, μ
-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 the AND circuit AN ₂₄ and connects it via the OR circuit OR ₁₂ described above.
Data such as Ivmax and set aperture value are not transferred. Therefore, the output of the inverter _IN15 becomes "High", and this "High" signal is input to one input terminal of the AND circuit _AN20 . and,
When the fullness signal is input from the fullness detection circuit CD to the other input terminal of the AND circuit AN ₂₀ , the output of the AND circuit AN ₂₀ becomes "High". At this time, as will be described in detail later, the AND circuit continues until the X contact SX of the strobe control device FC is closed.
The output of AN ₂₆ is "Low", and the output of inverter IN ₁₆ , which receives the "Low" signal from this AND circuit AN ₂₆ , is "High". Therefore, the two input terminals of the AND circuit AN ₂₃ are originally input with the "High" signal from the AND circuit AN ₂₀ and the inverter circuit IN ₁₆ , and the output of the AND circuit AN ₂₃ is "High". ” becomes. The “High” signal from this AND circuit AN ₂₃ is sent to the OR circuit.
It is applied via OR ₂₂ to the base of _the transistor BT ₆ , which makes it conductive.
When this 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, only the charge completion signal is sent from the strobe device FL to the shift register SR ₁ of the strobe control device FC, unlike in the second mode described above. During data reading, it is always read as a “High” signal. 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 FF ₂ and the reset terminal RE of counter CO ₂ .
Therefore, the output terminal Q of the flip-flop _FF2 becomes "High", and this "High" signal is input to one input terminal of each of the 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 ,
This 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 . Also, 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 shown in FIG. 13, and as the output data of the counter CO ₂ increases by 1, the terminals a ₀ , a ₁ , ..., an are sequentially set to "High". Outputs the signal. Here, the following explanation will be given assuming that the Dvmax data transferred from the camera body to the strobe device FL is n-bit data. When the first pulse FCP from the AND circuit AN ₄ is input to the counter CO ₂ , the decoder
The terminal _a0 of DE ₁ becomes "High" and remains "High" until the rise of the second pulse. This opens the gate of the AND circuit AN ₆₀ and μ−
The most significant bit data of the Dvmax data from output port _OP4 of com1 is OR circuit _OR3 ,
AND circuit AN ₅₂ , OR circuit OR ₆ through terminal JB ₅
It is output from the strobe side terminal JF ₁ and applied to the serial input terminal SI of the shift register SR ₂ via the AND circuit AN ₁₇ . This shift register SR ₂
Since data is taken in at the falling edge of the pulse FCP from the AND circuit _AN16 , the data of the most significant bit of Dvmax is taken in at the falling edge of the first pulse FCP. 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, the 2nd bit data of Dvmax is output from the AND circuit AN ₆₁ on the strobe controller FC side, and the 2nd pulse
At the falling edge of FCP, this data is transferred to shift register _SR2.
be taken in. Repeat the same action,
The terminal an of decoder DE ₁ is the n+1st pulse.
It becomes "High" at the rising edge of FCP and continues to be "High" until the rising edge of the n+2nd pulse FCP. During this time, the data of the least significant bit of Dvmin from the AND circuit AN _6o is output, and the n+1th pulse is output.
At the falling edge of FCP, this data is transferred to shift register SR.
Incorporated into 2. 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 ~an of decoder DE ₁
all become “Low”. Terminal an of decoder DE ₁
is connected to the reset terminal of the flip-flop FF ₂ via the OR circuit OR ₂ , and when the n+2nd pulse FCP rises, the output of the terminal an falls to “Low”, and the 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 Dvmax and Dvmin data sent from the camera body. The switch DS is a switch that changes the display contents; when it is closed to the terminal m side, it displays meters, and when it is closed to the terminal ft side, it displays feet. Note that the interlocking range is also displayed on the display section DP ₅ on the camera body side. 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 Dvmax and Dvmin to the strobe. This is because if the strobe device FL is not attached to the camera body, the terminal an of decoder DE ₁ will not fall from "High" to "Low" and flip-flop FF ₂ will not be reset after being set. be. 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 flip-flop FF ₃ through OR circuit OR ₄
Reset terminals R and D flip-flop DF ₂
is input to the reset terminal RE of the pulse DP, and both flip-flops _FF3 and _DF2 are reset at the falling edge of the pulse DP. 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 . Further, the "High" signal at the Q output terminal of the D flip-flop _DF4 is input to one input terminal of the 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".
This “High” signal is the μ-com described above.
1 input terminal _i7 . In this way,
The above-mentioned fullness signal is input to μ-com1. 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 clock 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, only one pulse is given to the counter CO ₃ , so the timer circuit is
By providing TI ₈ , it is possible to prevent the output of counter CO ₃ from being held at "0001" and flip-flop FF ₁₀ from being held in the set state for an unnecessarily long time. 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 0.5Ev less. The signal voltage from the constant voltage source CE ₂₁ is a voltage corresponding to the appropriate exposure level. The integral value of capacitor C ₁ (i.e., the integral value of the amount of light measured by TTL photometry of the amount of reflected light from the object illuminated by the strobe light) is the constant voltage source CE ₂₀ or CE ₂₁
When the output voltage reaches the output voltage, the output of the comparator _AC1 becomes "High", and a "High" pulse is output from the one-shot circuit _OS9 . At this time,
When _the signal indicating the TTL mode is read in the shift register _{SR 1} , the strobe device _FL (first
A pulse is sent to terminal JF ₁ in Figure 3) 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.
Light emission is stopped when the exposure level reaches an underexposure level of 0.5Ev, and when a strobe device is used as the main light source, 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 is set to 0.5Ev. 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 ₁₆ 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 arithmetic operation described above 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 _OR24 . 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
Similar to FDC ₁ , a display is displayed for a certain period of time to confirm dimming.

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Claims (1)

[Claims] 1. A constant light metering means for measuring the brightness level of the constant light of the subject, and outputting a signal indicating a predetermined aperture value for flash photography, which is determined regardless of the brightness level of the constant light from the metering means and corresponds to a constant film sensitivity. a predetermined aperture value signal output means for outputting a predetermined aperture value signal, a predetermined aperture value signal output means for outputting a signal indicating the film sensitivity of the set film, and inputting signals from the predetermined aperture value signal output means and the predetermined film sensitivity signal output means. and calculates an aperture value signal in which the predetermined aperture value signal is changed by an amount corresponding to the difference between the constant film sensitivity and the set film sensitivity, and outputs the aperture value signal as a first aperture value signal for flash photography.
a second signal output means for calculating and outputting a second aperture value signal for flash photography based on the signals from the photometry means and the film sensitivity signal output means; determining means for determining whether the brightness level of the stationary light is higher or lower than a predetermined level based on the signal; selectively outputting a signal from the first signal output means, and when the determination means determines that the brightness level of the stationary light is higher than a predetermined level, selectively outputting the signal from the second signal output means; A signal selection means to output, an aperture control means for controlling the aperture based on one of the aperture value signals output from the signal selection means, and a flash light metering means for measuring the amount of light reflected from a subject due to light emission from a flash light emitting device. and a third signal output means for outputting a signal to stop the flash light emitting device from emitting light when the integrated value of the photometric values from the photometric means reaches a predetermined value. Device.