JPS6353532B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a photographing device using an auxiliary light suitable for a camera having a focal plane shutter, and in particular to a camera of this type, which has a high shutter speed and a flash device. The present invention relates to a photographing device in which a conventional flash automatic camera is improved so as to have a wider photographing range by combining luminous intensity.

BACKGROUND ART Conventionally, the following three types of flash devices have been mainly used for automatic flash photography with a camera having a focal plane shutter. In other words, there are those that keep the amount of light emitted constant and automatically control the aperture on the lens side according to the subject distance, and those that set the aperture on the lens side to a specified aperture and then automatically control the amount of light emitted according to the distance and reflectance of the subject. Select the lens aperture arbitrarily,
These devices measure the light reflected from the film surface and automatically control the amount of light emitted according to the distance to the subject and the reflectance of the subject. The lens-side aperture method is a so-called flash automatic, which has the advantage of not being affected by the reflectance of the subject, but there is a limit to the aperture value on the lens side, which limits the distance to the subject. With the distance and reflectance method, it is possible to shoot at fairly close distances, but because the aperture is specified, the depth of field is insufficient for close-up shooting, and at the same time, it has the disadvantage of being affected by the reflectance of the subject. . The film surface reflection photometry method has the drawback that in addition to being affected by the reflectance of the subject, the reflectance of the film itself is also included as an error factor during light adjustment.

Purpose of the Invention The present invention eliminates the above-mentioned conventional drawbacks, and provides a new method for photographing using auxiliary light with a focal plane shutter having a front curtain and a rear curtain, in addition to the conventional flash emission when the shutter is fully opened. By combining the light emission with the start of light emission when the front curtain starts running, and the light emission contributing to the exposure of the film while the film is being exposed, we have created a flash maceration system that uses only conventional flash light emission. It is an object of the present invention to provide a new photographing device that can extend the photographing distance to the short distance side and can emit light with priority given to the aperture or shutter speed.

That is, one of the photographing apparatuses according to the present invention includes a focal plane shutter having a leading curtain and a trailing curtain, and starts emitting light in conjunction with the start of running of the leading curtain of the focal plane shutter. a first light emitting means that emits light that contributes to exposure of the film while the plane shutter is operating and the film is exposed; and a first light emitting means that emits light for a short time when the focal plane shutter is fully open. a second light emitting means; a distance information output means for outputting distance information regarding the distance to the subject; and a distance information output means for determining whether the distance information is larger or smaller than a predetermined value; , a selection means for selecting the second light emitting means when the value is smaller than a predetermined value, a film sensitivity information output means for outputting film sensitivity information regarding the sensitivity of the film, and an aperture value information output means for outputting aperture value information regarding the aperture value. means for calculating an exposure time according to the distance information, film sensitivity information, and aperture value information when the first light emitting means is selected by the selection means; an aperture value information means for calculating an aperture value according to distance information and film sensitivity information when the first light emitting means is selected; and controlling the aperture based on the aperture value information when the first light emitting means is selected by the selection means; an aperture control means that controls the aperture based on the calculated aperture value when the second light emitting means is selected; and a focal control means that controls the aperture based on the calculated exposure time when the first light emitting means is selected by the selection means; The present invention is characterized by comprising a shutter control means that controls the plane shutter and controls the focal plane shutter so that it is fully open when the second light emitting means is selected.

Another aspect of the photographing device according to the present invention includes a focal plane shutter having a leading curtain and a trailing curtain, and a focal plane shutter that starts emitting light in conjunction with the start of running of the leading curtain of the focal plane shutter. a first light emitting means for emitting light that contributes to exposure of the film while the focal plane shutter is operating and exposing the film; and a first light emitting means for emitting light for a short time when the focal plane shutter is fully open. a second light emitting means for performing the photographing, a distance information output means for outputting distance information regarding the distance to the subject, and a first light emitting means for determining whether the distance information is larger or smaller than a predetermined value, and when it is larger than the predetermined value. is smaller than a predetermined value, a selection means for selecting the second light emitting means, a film sensitivity information output means for outputting film sensitivity information regarding the sensitivity of the film, and an exposure time information output means for outputting information regarding the exposure time. and a first aperture value calculation means for calculating an aperture value according to distance information, film sensitivity information, and exposure time information when the first light emitting means is selected by the selection means;
a second aperture value calculation means for calculating an aperture value according to distance information and film sensitivity information when the second light emitting means is selected by the selection means; and an aperture diaphragm for controlling the aperture value based on the calculated aperture value. control means;
When the first light emitting means is selected by the selection means, the focal plane shutter is controlled based on the exposure time information, and when the second light emitting means is selected, the focal plane shutter is fully opened. The invention is characterized in that it has a shutter control means for controlling the shutter.

Therefore, in the photographing device of the present invention, in order to enable control for the purpose described above, the distance information of the distance information output means is used, the selection means determines the magnitude of the distance information, and the first light emission is performed. The means and the second light emitting means are switched. In other words, by selecting the first light emitting means for short distances and selecting the second light emitting means for long distances, the shooting distance is expanded to the short distance side. When the light emitting means is selected, in the first aspect of the present invention, the exposure time is calculated based on the aperture value information, while in the second aspect of the present invention, the aperture value is calculated based on the exposure time information. This makes it possible to use the lens with aperture priority or shutter speed priority.

Embodiments Hereinafter, embodiments of the present invention shown in the drawings will be described in detail.

FIG. 1A shows two types of light emission waveforms of the light emitter used in the photographing device of the present invention. The second light emission waveform is a flat light emission (constant light intensity) waveform that continues light emission for a long time _T0 at a constant luminous intensity _I0 . Here, T ₀ is the time from when the shutter on the camera side begins to open until it is completely shut off. For example, in the case of a focal plane shutter, the time it takes for the leading curtain to travel across the film screen (curtain speed) as shown in Figure 1B. ) and the high-speed shutter speed (exposure time) that is greater than or equal to the sync speed. If T ₀ is smaller than this, uneven exposure will occur.
P and P' indicate the total amount of light emission of flash light emission and flat light emission, and usually P≧P'.

Generally, the relationship among the total amount of light emitted by the flash unit P, the aperture F, the distance L between the flash unit and the subject, and the film sensitivity S is expressed as a√·=F·L (1) (a is a constant).

When formula (1) is logarithmically compressed and expressed as S=2 ^Sv , F=√2 ^Av , and L=2 ^Lv , it becomes Av=Sv−2 ^Lv +log ₂ P+2log ₂ a (2).

Furthermore, the amount of light emitted by a flash device is generally expressed as a guide number in ASA100, and is the value when S= ²⁵ in equation (1). Therefore, the guide number is GN
(=2 ^Gv ), then GN=a2 ⁵・=2 ^Gv ...(3). From equation (3), 2 ^Gv −5=log ₂ P+2log ₂ a ...(4) is obtained.

Therefore, from equations (2) and (4), Av=2・^(Gv-Lv) + (Sv-5)...(5), and equation (5) determines the aperture according to the guide number, distance, and film sensitivity. This is the aperture arithmetic formula for the flash tick as a normal flash light emission to be determined.

In the case of (b) flat light emission, the factor of shutter speed is included to determine the aperture. This will be explained below. Here, if the luminous intensity during constant light emission is I ₀ and the effective amount of light emitted that contributes to film exposure at shutter speed T (2- ^Tv ) is P', then P' = I ₀・T = I ₀・2 ^-Tv ...(6).

If P is replaced with P′ in equation (2), Av=Sv=2 ^Lv −Tv+(log ₂ I ₀ +2log ₂ a) ……(7) log ₂ I ₀ +2log ₂ a=2k (k: emission intensity I ₀ (a constant determined by the ^constant determined by Obtain the general calculation formula for flat light emission (determined).

Also, from equations (6) and (3), GNe=a√2 ⁵・₀・ ...(9) Here, if we approximately set P′=I ₀ and T ₀ =P, get. Equation (10) shows the guide number equivalent amount GNe depending on the shutter speed when flat light emission is used.

FIG. 2 is a program diagram as an example showing the relationship between the distance to the subject, aperture, and shutter speed according to the embodiment of the present invention in which two types of light emission waveforms are discriminated based on distance information and used selectively. It is possible to take flash photographs of objects at even closer distances than with a shutter, and various combinations of aperture value and shutter speed are shown.

The embodiment in Fig. 2 is a flash device with GN=28,
This is an example using a lens with an aperture of F2.8 to F22. Normal flash photography can be performed at a shutter speed of 1/60 seconds (sync speed), and flat flash photography can be used at a high shutter speed of 1/125 seconds or more. The time T ₀ is determined as follows.

In other words, using a focal plane shutter as an example, the curtain speed of the first curtain is 13 ms (time to travel between screens), the exposure time (shutter speed) is 8 ms, and T ₀ = 22 ms with a slight margin until stable light emission. This is an example. According to this, at shutter speed 1/1000, GNe=6, at 1/500, GNe≒8.5, and at 1/250.
GNe≒12, and at 1/125, GNe≒17.

Therefore, in the conventional flash memory 10
The shooting range was from m (F2.8) to 1.3m (F22), but in this example, the shooting range was from 10m (F2.8) to
The range can be extended to 0.27m (F22). In the program shown in the figure (thick solid line), C
At the distance between -A, in order not to reduce the far point, as in the past, synchronize with the shutter fully open with a flash automatic of GN = 28, effectively utilize the light emission, and determine the aperture based on formula (5). Then, at point A, the shutter speed is 1/
125, when switching to flat light emission, the distance range between A and B' in the figure is the same as when the shutter speed is 1/125, the aperture is determined based on equation (8), and GN = 17. Equivalently, and furthermore, the closest distance point D from point B′
After fixing to the minimum aperture (Avmax) up to (8)
This is a program that determines the shutter speed based on a formula and obtains the same result as changing the amount of light emitted by the light emitter. In the program (), the point A can be set arbitrarily between A' and B.
Also, () (dotted chain line) is a program in which the program in () is set to a shutter speed of 1/1000,
The shutter speed can also be set arbitrarily. This allows the shutter speed to be used preferentially in the distance range from point A to point D. It is also possible to perform an aperture-priority program in the distance range from point A to point B' as shown by the broken line. In this way, A, B,
D from A by taking various courses within the range of C and D.
You can set up many programs ranging from .

FIG. 3 shows a specific embodiment of the present invention, ()
The camera body 2 is a photographic lens (in the embodiment shown in FIG. 2, an F2.8 to F22 lens), and the photographic lens 2 is detachably attached to a front frame 1a that is integral with the camera body 1. When the photographic lens 2 is installed, the terminal J ₁ ,
J ₂ is electrically connected to J' ₁ and J' ₂ respectively, and the resistance value of variable resistor VR ₁ that indicates information on the photographing distance is varied in conjunction with the distance ring 2b of the photographing lens 2, and the terminal
Shooting distance information is transmitted to the camera body 1 side through J' ₁ , J' ₂ , J ₁ , and J ₂ .

3 is a light emitter that can emit two types of light, flash light and flat light as shown in Fig _. ′ ₃ , J ₄ −J′ ₄ are electrically connected. SH is a focal plane shutter built into the camera body 1; 11 is a front curtain interlocking gear that engages with a front curtain gear 15a that is integral with the curtain shaft 17; It is interlocked with the front curtain slit 18 via. A trailing gear 12 is engaged with a trailing gear 14a that is integral with the trailing barrel 14 and interlocks with the trailing slit 19. Reference numeral 13 denotes a ratchet wheel for determining the aperture, which is integrated with a lever 13' and comes into contact with the aperture linking pin 2a of the photographic lens 2. When the front curtain interlocking gear 11 is unlocked by a known locking mechanism (not shown), the ratchet wheel 13 is rotated clockwise by the spring 42 and the aperture interlocking pin of the photographing lens 2 is rotated clockwise. 2a also moves following the lever 13', and the aperture of the photographic lens 2 is narrowed down. Mg ₁ is an electromagnetic coil for aperture control, which is combined with a permanent magnet 31, and is attracted by the permanent magnetic flux, and the lever 21 is biased clockwise by a spring 41.
is demagnetized by energizing the permanent magnet Mg ₁ , and at the same time rotates clockwise to stop the ratchet wheel 13 and determine the aperture of the photographic lens. Mg ₂ is an electromagnetic coil for controlling the shutter trailing curtain, and has the same configuration as Mg ₁ , and the lever 20, which is attracted and held by the magnetic velocity of the permanent magnet 30, is moved by the spring 4 by energizing Mg ₂ .
0, it rotates clockwise to release the engagement with the engagement pin 12a on the leading interlocking gear 12, and as a result, the trailing curtain is unlocked and the trailing curtain slit 19 runs.

In the figure, C _I , Cd, Co, Cs, and C _A indicate circuit blocks. C _I is an information setting circuit for determining the program (see Figure 2), which includes photographing distance information for the flash and flat flash switching points, the guide number of the light emitter, and the luminous intensity during flat flash (the distance information and guide number are (It may be provided on the third side). In addition, sync speed information, shutter speed during flat flash, maximum shutter speed, minimum F value and maximum F value of the photographing lens are also provided.
This circuit is used to set values, film sensitivity, etc.
Cd is a discrimination circuit that discriminates the type of light emission waveform of the flash device, and a circuit for setting distance information and information from the photographing lens 2.
Based on the distance information of the light emission switching point set in C _I ,
This circuit determines whether flash light emission is flat light emission. Co is an arithmetic circuit that calculates the information set by the information setting circuit C _I. If the result of the discrimination circuit Cd is flash emission, it sets the shutter speed to the synchronized speed, and also determines the distance from the photographing lens, the film sensitivity, and the light emitter. While calculating the aperture value from each information of the guide number, if the discrimination circuit Cd is flat emission,
Either determine the aperture value using the set shutter speed (higher than the sync speed) and the information on the flat flash luminous intensity, distance, and film sensitivity, or determine the shutter speed using the flat flash luminous intensity, distance, and film sensitivity information at the set aperture value. Calculate. Cs and C _A are the shutter control circuit and diaphragm control circuit, respectively, and the calculation circuit Co
The shutter speed and aperture are controlled based on the output. S ₁ and S ₂ are a flash light emission drive switch and a flat light emission drive switch, respectively, and S ₁ is a pin 11a integrated with the front curtain interlocking gear 11 of the shutter SH.
This is a normally open switch that is closed at the end of the rotation of the front curtain interlocking gear 11, that is, after the front curtain slit 18 passes the end of the opening 1c of the camera body 1. _S2 is a normally closed switch driven by the pin 11a, and is closed at the beginning of the rotation of the front curtain interlocking gear 11, that is, before the front curtain slit 18 opens the opening 1c.

In addition, each switch S ₁ and S ₂ is always driven when the shutter SH is activated, but when the flash light is emitted, the aperture 1c
When S ₁ is fully open, S 1 becomes conductive and drives the flasher 3 to emit light, but S ₂ becomes non-conductive due to the discriminator circuit Cd.
On the other hand, during flat light emission, _S2 is conductive and drives the light emitter 3 to emit light, but _S1 is controlled by the discrimination circuit Cd so that it is not conductive from a circuit perspective. Note that the switches S ₁ and S ₂ are each released after the trailing curtain has completed running using a known mechanism (not shown).

Next, a series of operations will be explained based on FIGS. 2 and 3. First, with the photographic lens 2 and the flash unit 3 attached to the camera body 1, turn on the power switch of the camera body 1 and the power switch of the flash unit 3 (both not shown), and turn on the information setting circuit for program determination. In the embodiment shown in FIG. 2, C _I includes the guide number of the light emitter 3 (GN=28), the luminous intensity at constant luminous intensity (I ₀ ), the minimum aperture value (F2.8) of the photographic lens 2, and the maximum aperture value ( F22) Film sensitivity, minimum speed (1/125) and maximum speed (1/1000) capable of constant light emission are set.

In addition, the discrimination circuit Cd contains information about the distance A between the switching point between flash light emission and flat light emission (2.2 m in Fig. 2).
and the tuning speed specified by the shutter (second
(1/60 seconds in the figure) is input, and then the arithmetic circuit Co
If you preferentially use the shutter as shown in Figure 2, set the aperture information to the maximum aperture value (F22 in Figure 2) and set the desired shutter speed (1/125 in Figure 2). , is 1/1000).

On the other hand, if you preferentially use the aperture as shown in Figure 2, set the shutter speed to the maximum shutter speed and set the desired aperture (in Figure 2,
F8).

Next, set the distance ring 2b of the photographing lens 2 to the distance of the subject.
When the distance is rotated and matched using a known method, the distance A set in the program determination information setting circuit C _I is obtained.
The point and subject distance are compared by the discrimination circuit Cd, and as a result, if the subject distance is farther than point A, the shutter speed is set to the synchronized speed (1/60 seconds), and when the release button (not shown) is pressed, the ratchet wheel 13 is activated. When the rotation starts, the aperture of the photographic lens is narrowed down through the lever 13' and the pin 2a. When the aperture value calculated by the calculation circuit Co is reached based on the information in the information setting circuit C〓, that is, the guide number of the light emitter, the film sensitivity, and the subject distance, the aperture control circuit _C
Since Mg ₁ is energized to release the lock of the lever 21, the ratchet wheel 13 is stopped by the lever 21 and the aperture is determined. Next, when the front curtain interlocking gear 11 of the focal plane shutter SH is unlocked by rotating the lever 21 (locking part not shown),
The front curtain slit 18 starts running and opens the opening 1c. When the front curtain slit 18 fully opens the opening 1c, the switch _S1 is closed by the pin 11a of the front curtain interlocking gear 11, and the flash device which is ready to emit a flash waveform according to the signal from the discrimination circuit Cd 3 emits flash waveform light. Since counting of the shutter speed is started at the beginning of rotation of the front curtain interlocking gear 11, when the count time corresponding to the synchronized speed is reached, the shutter control circuit Cs by a signal from
When Mg ₂ is energized, the lever 20 is unlocked.

Therefore, when the lever 20 releases the pin 12a of the trailing gear 12, the trailing gear 12 rotates, the trailing slit 19 closes the opening 1c, and at the same time a switch is activated by a conventionally known mechanism (not shown). Open S ₁ and the series of operations is completed.

Also, if the subject distance is closer than point A, the discrimination circuit
Due to the Cd signal, the constant luminous intensity emission is in the ready state,
The shutter speed becomes the set shutter speed (I in FIG. 2 is 1/125 between A and B', and 1/1000 between A and D). Further, in response to a signal from the discrimination circuit Cd, the aperture value is calculated by the arithmetic circuit Co from the set shutter speed, constant light intensity, and film sensitivity, and this aperture value is controlled and determined by the aperture control circuit C _A. Since the discrimination circuit Cd enables constant light emission, the flasher is activated by the switch _S2 at the beginning of the rotation of the front curtain interlocking gear 11, that is, before the front curtain slit 18 begins to open the opening 1c. drives constant luminous intensity emission. and shutter control circuit
Cs energizes Mg ₁ so that the above-mentioned set shutter speed is achieved. In the program shown in Figure 2 I, the aperture reaches the minimum aperture value F22 at point B', so B',
In the program between D, the aperture is fixed at the minimum aperture by the arithmetic circuit Co, and then changes to a program for variable shutter speed. That is, the arithmetic circuit Co uses the minimum aperture value signal set in the information setting circuit C _I to
Calculations are performed to determine the shutter speed based on the luminous intensity, film sensitivity, and distance information between B' and D, and the shutter speed is controlled by the shutter control circuit Cs in the process described above.

Furthermore, in the program shown in Figure 2, the distance A,
Between B′, the distance B′ and C of the above program
Similar to the information and calculation between, this time the information setting circuit C _I
According to the aperture value set by , the shutter speed is determined based on the luminous intensity, film sensitivity, and distance information between A and B', and is controlled as described above. Then, the shutter speed reaches the maximum shutter speed at distance B', so the program between B' and D changes to a program that fixes the shutter speed at the maximum speed (1/1000 in Figure 2) and changes the aperture value. . That is,
Based on the maximum shutter speed signal set in the information setting circuit C _I , the calculation circuit Co performs calculations to determine the aperture based on the luminous intensity, the film sensitivity, and the distance information between B' and D, and then controls the aperture control circuit. C _A
The aperture is controlled in the process described above.

FIG. 4 shows an example of the program shown in FIG. 2. VR ₁ is a variable resistor whose slider moves according to the position of the distance ring, which is installed on the lens side.
J ₁ , J′ ₁ and J ₂ , J′ ₂ are terminals for electrical contact between the lens and the camera body, and I ₁ is a constant current circuit that supplies a constant current to the variable resistor VR ₁ . Note that the slider of the variable resistor VR ₁ is structured to move so that the resistance becomes twice the logarithm of the focus-adjusted object distance L. Therefore, the potential of terminal J ₁ corresponds to 2·log ₂ L=2· ^Lv .

E ₃ is the potential (2・
AC ₁ is a comparator that compares the potential of terminal J ₁ with the output potential of constant voltage source E ₃ , and E ₁ is a constant voltage source that outputs a potential corresponding to (2・Gv−5). The voltage source E ₂ is a constant voltage source that outputs a potential corresponding to (2·k). _AS1 is an analog switch as shown in Figure 5A, and a comparator
When the output of AC ₁ is Low, the signal from constant voltage source E ₁ is output, and when it is High, the signal from constant voltage source E ₂ is output. A circuit composed of resistors _R1 to _R4 and an operational amplifier _OA1 is a subtraction circuit _SU1 , _VR2 is a variable resistor for setting film sensitivity, and _I2 is a constant current source.

AS ₂ is an analog switch as shown in Figure 5B, and when the output of comparator AC ₁ is "High", the n-channel FET, ET ₃ is turned on, the p-channel FETs, ET ₂ and ET ₄ are turned off, and the terminal is turned off. The signal from j ₁ is output to terminal j ₃ , and terminal j ₂ has no signal. On the other hand, when the output of comparator AC ₁ is “Low”, the n-channel FET and FT ₃
OFF, p-channel FET, FT ₂ and FT ₄ turn ON, the signal from terminal j ₁ is output to terminal j ₂ and terminal j ₃
becomes earth potential.

E ₄ is fixed shutter speed Tvc ₂ (e.g. 1/125sec)
A constant voltage source that outputs a potential corresponding to the resistor R ₅ ~
The circuit composed of _R8 and operational amplifier _OA2 is a subtraction circuit _SU2 . E ₆ is the minimum aperture of the lens (Avmax)
A voltage source that outputs a potential corresponding to, for example, a potential corresponding to the position of the signal member of the lens.
AS ₃ is an analog switch. When the output of comparator AC ₂ is “Low”, it outputs the signal from voltage source E ₆ , and when it is “High”, it outputs the signal from the analog switch AS _2.
Outputs the potential from the output terminal j ₂ or the output terminal of the operational amplifier OA ₂ .

_E7 is a voltage source that outputs a potential corresponding to the open aperture of the lens, for example, outputs a potential that corresponds to the position of the signal member of the lens. LD ₁ is a light emitting diode that indicates that the amount of light emitted by the light emitter 303 is out of range linkage. CA is the aperture control circuit,
For example, the aperture step number signal is calculated based on the aperture signal from the analog switch AS ₃ and the open aperture signal from the voltage source E ₇ , and the signal from the lens aperture step number signal transmission member matches the calculated step number signal. At this point, the diaphragm aperture is determined by stopping the diaphragm operation using the magnet Mg ₁ .

E ₅ is the tuning limit shutter speed Tvc ₁ (for example, 1/60
Constant voltage source AS ₄ outputs a potential corresponding to sec) when the output of comparator AC ₁ is High, it outputs the potential from constant voltage source E ₄ , and when it is Low, it outputs the potential from constant voltage source E ₅ . This is an analog switch that outputs. The circuit consisting of resistors R ₉ to R ₁₂ and operational amplifier OA ₃ is subtractor circuit SU ₃ and AS ₅ is a comparator.
When the AC ₂ output is High, the analog switch
This is an analog switch that outputs the signal from AS ₄ , and when it is low, outputs the output potential of operational amplifier OA ₃ .

LD ₂ is a light emitting diode that indicates that the amount of light emitted from the light emitter 303 is out of short-range synchronization, and Cs is a shutter control circuit that obtains an exposure time corresponding to the output voltage of analog switch AS ₅ . _S1 is a so-called X contact that is closed when the shutter is fully opened, and _S2 is a switch that is closed when the shutter starts to open. The light emitter 303 emits a normal flash when the switch S ₁ is closed when the signals from the terminals J ₄ and J' ₄ are low, and when the signals from the terminals J ₄ and J' ₄ are high. is a light emitter that emits flat light when switch _S2 is closed, and the detailed circuit will be described later with reference to FIG.

Next, the operation of the circuit shown in FIG. 4 will be described with reference to FIG. 2I.

First, when the object is within the distance range from C to A in FIG. 2, the potential of the terminal _J1 is higher than the output potential of the constant voltage source _E3 , and the output of the comparator _AC1 is Low. Therefore, the analog switch AS ₁ outputs a potential corresponding to the guide number (2Gv-5) of the light emitter 303 from the constant voltage source E ₁ , and this signal and the distance signal (2Lv) from the terminal J ₁ are subtracted. circuit
It is input to SU ₁ and the calculation (2 ^Gv - 5 - 2 ^Lv ) is performed.

Next, the sensitivity of the film used is added by the variable resistor VR ₂ to calculate Av=2. ^(Gv-Lv) +(Sv-5) (5). This calculated signal is output from the terminal _j2 of the analog switch AS2.

At this time, since the potential of the terminal _j3 is at the ground potential, the output of the subtraction circuit _SU2 is at a negative potential. Further, since the output of the comparator AC ₁ is Low, the n-channel FETFT ₁ becomes non-conductive, and the potential of the terminal j ₂ remains at the potential of the slider of the variable resistor VR ₂ . Since the potential of the subtraction circuit SU ₂ is negative, the output of the comparator AC ₂ becomes High, and the potential of the terminal j ₂ is output from the analog switch AS ₃ , which is input to the aperture control circuit C _A and the comparator AC ₃ .
The aperture is controlled to the value calculated by the above equation (5).

Furthermore, when the aperture value calculated by equation (5) is smaller than the potential corresponding to the open aperture value Avmin from the voltage source _E7 , the output of the comparator _AC3 becomes Low, the light emitting diode _LD1 lights up, and the light emitter 303 indicates that the amount of light emitted is out of range linkage, and the aperture at this time is controlled to open aperture.

In addition, since the output of comparator AC ₁ is Low and the output of comparator AC ₂ is High, analog switch AS ₄ outputs the potential from constant voltage source E ₅ , and analog switch AS ₅ outputs the potential from analog switch AS ₄ . This signal is input to the shutter control circuit Cs, which controls the shutter speed to the tuning limit (1/60 sec) for normal light emission.

Furthermore, since the output of comparator AC ₁ is low, transistors Q ₁ and Q ₃ are non-conductive, and transistor Q ₂
is conducting. Therefore, when the shutter is fully opened, a signal indicating that the X contact _S1 is closed is transmitted to the light emitter 303.
Since the terminal _J'4 is low, the light emitter 3 emits a normal flash light.

Next, a case where the distance to the subject is in the range from A to B' in FIG. 2 will be explained. At this time, the potential of the terminal _J1 is lower than the output potential of the constant voltage source _E3 , so the output of the comparator _AC1 is High. Therefore,
The analog switch AS ₁ receives the voltage from the constant voltage source E ₂ .
A potential corresponding to 2k is output. This potential and the potential 2·Lv from the terminal _J1 are input to the subtraction circuit _SU1 , and a potential corresponding to 2· ^(k-Lv) is output. Furthermore, a potential corresponding to the film sensitivity is added to this potential by a variable resistor _VR2 .

Since the output of comparator AC ₁ is High, analog switch AS ₂ outputs the input potential to terminal j ₃ ,
Fixed shutter speed (1/125sec) from constant voltage source E ₄
It is input to the subtraction circuit SU ₂ together with the potential corresponding to Tvc ₂ .

Therefore, the subtraction circuit SU ₂ outputs a potential corresponding to Av=2. ^(k-Lv) +Sv-Tvc ₂ (8-1). At this time, the calculated aperture value Av is smaller than the minimum aperture value Avmax, so the output of the comparator _AC2 becomes High. Therefore, the analog switch _AS3 outputs a potential corresponding to the calculated aperture value Av input via the n-channel FET, _FT1 , and the aperture is controlled based on this potential. In addition, the output of comparator AC ₁ from analog switch AS ₄ is High.
Therefore _, the potential from the constant voltage source _E4 is output, and since the output of the comparator _AC2 is High, the output potential of the analog switch _AS4 is output from the analog switch AS5. Therefore, the shutter speed is a value corresponding to the output potential of constant voltage source _E4 (1/125sec)
controlled by. Also, the output of comparator AC ₁ is
Since it is High, transistors Q ₁ and Q ₃ are conductive and transistor Q ₂ is non-conductive. Therefore, the switch that is closed when the shutter starts to open is
The S ₂ signal is transmitted to the light emitter 303, and the terminal J' ₄ is
Since it is High, flat light emission is performed.

Next, a case where the subject distance is in the range from B' to D will be described. In this case, the potential corresponding to the aperture value Av calculated according to equation (8-1) output from the subtraction circuit SU ₂ is the minimum aperture value from the voltage source E ₆ .
Since it is higher than the potential corresponding to Avmax, the output of comparator AC ₂ becomes Low. Therefore, the potential from the voltage source _E6 is output from the analog switch _AS3 , and the aperture is controlled to the minimum aperture value.

On the other hand, the subtraction circuit SU ₃ has an analog switch.
The potential from terminal j ₃ of AS ₂ and the potential corresponding to the minimum aperture Avmax from voltage source E ₆ are input, and T _v = 2・^(k-Lv) +Sv−Avmax ……(8-2) A corresponding potential is output. At this time, the output of comparator AC ₂ is low, so the analog switch is
The potential from the subtraction circuit _SU3 is output from _AS5 . The shutter speed is then controlled to a value calculated according to equation (8-2).

Also, when the calculated shutter speed Tv is greater than the maximum shutter speed Tvmax, the output of comparator _AC4 becomes Low, and the light emitting diode
LD ₂ lights up to warn that the amount of light emitted by the light emitter 303 is out of close range linkage. Also, the light emitter 303
When the shutter starts to open, flat light is emitted.

FIG. 6 shows a specific circuit example of the light emitter 303 shown in FIG. 4. B ₁ is the power battery, S ₃ is the power switch,
404 is a booster circuit, C ₁ is a neon tube that lights up when the charging voltage of the main capacitor C ₁ reaches a predetermined value, and 505 is a trigger circuit for the xenon tube Xe.

When the power switch _S3 is closed, the boost circuit 404
operates to charge the main capacitor _C1 . When the charging voltage of the main capacitor C ₁ reaches a predetermined value, the neon tube Ne lights up and the resistors R ₁₆ ,
The potential at the connection point between R ₁₇ and capacitor C ₂ becomes High, and transistors Q ₄ and Q ₆ become conductive. When the potential of the terminal J' ₄ is Low, the signal of the X contact S ₁ is input to the light emitter side, as described above. X
When contact S ₁ is closed, transistors Q ₄ and Q ₅ become conductive, and the potential at the connection point of resistors R ₁₈ and R ₁₉ becomes High.
As a result, the thyristor _SC1 conducts, the trigger circuit 505 operates, and the xenon tube Xe is triggered. Also, since the terminal _J'4 is low, the transistor _Q8 does not conduct. Therefore, the X contact
When S ₁ is closed, transistor Q ₆ becomes conductive, transistor Q ₇ becomes non-conductive, transistor Q ₉ becomes conductive, and transistor Q ₁₀ becomes conductive. Therefore, resistance
The potential at the connection point of R ₂₀ and R ₂₁ becomes High, the thyristor SC ₂ becomes conductive, and the xenon tube Xe emits normal light as shown by A in FIG. 1A. At this time, transistor Q ₉ becomes conductive, and transistor Q ₁₁ becomes conductive.
becomes non-conductive, and Q ₁₂ remains conductive. Therefore, the output of comparator AC ₅ remains low and transistor Q ₁₃ does not conduct.

On the other hand, when the terminal J' ₄ is High, the signal from the switch S ₂ , which is closed when the shutter starts opening, is transmitted to the light emitter 30.
3 is input. When the switch _S2 is closed, the transistors _Q4 , _{Q5 and} the thyristor _SC1 conduct and trigger the xenon tube Xe. Furthermore, since transistor Q ₈ is conductive, transistors Q ₉ and Q ₁₀ and thyristor SC ₂ are not conductive. Further, transistor Q ₁₁ becomes conductive, and transistor Q ₁₂ becomes non-conductive. Therefore, the output of comparator AC ₅ is
It becomes High, transistor _Q13 becomes conductive, current flows through the xenon tube Xe via the coil L, and light emission starts. At this time, the light emission intensity of the xenon tube Xe does not increase rapidly due to the action of the coil L and the response delay of the xenon tube Xe, and furthermore, energy is stored in the coil L magnetically. and xenon tube Xe
When the emission intensity of increases, the output current of the phototransistor PT for monitoring the emission intensity increases, and the potential at the connection point between the phototransistor PT and the resistor _R15 exceeds the potential at the connection point between the resistors _R13 and _R14 . , the output of comparator _AC5 is inverted to Low, and transistor _Q13 becomes non-conductive. Then, due to the energy magnetically stored in the coil L, the diode
D ₁ , a current flows through the xenon tube Xe, and the emission intensity of the xenon tube Xe further increases and then gradually decreases.The output current of the phototransistor PT also decreases, and the output current of the phototransistor PT and resistor _R15 decreases. The potential at the connection point becomes lower than the potential at the connection point between resistors _R13 and _R14 , and the output of comparator _AC5 becomes
It becomes High, and transistor _Q13 becomes conductive. Then, due to the response delay of the xenon tube Xe, the emission intensity further decreases and then increases. By repeating the above operation much faster than the light emission time of the xenon tube Xe, the xenon tube Xe becomes as shown in Figure 1. Flat light emission with a substantially constant light emission intensity as shown by B in A is performed.

Note that even after the charging voltage of the main capacitor C ₁ decreases due to conduction of the xenon tube Xe and the neon tube Ne becomes non-conductive, the capacitor C ₂ remains connected to the transistor Q ₄ while the xenon tube Xe is fully emitting light. Provided to keep Q ₆ in a conductive state. Furthermore, capacitors C ₃ and C ₄ are provided to apply trigger pulses to the gate terminals of thyristors SC ₁ and SC ₂ .

FIG. 7 shows a circuit for exposure compensation during close-up photography, and between the terminals _{i 1} and i ₂ in FIG.
i′ ₂ is connected, and as a result, the effective minimum aperture value is input to the subtraction circuit SU ₃ instead of the minimum aperture value Avmax, and the exposure time is calculated based on this. become. , in the figure, variable resistance
VR ₃ is a variable resistance whose slider moves according to the position of the distance ring, and the resistance value at the position of the slider is the shooting distance l corresponding to the position of the distance ring, the focal length f of the lens, and the pupil of the lens. Based on the magnification ψ, the relationship between the imaging magnification M (1+M/ψ) ² is a logarithmic value. In addition, terminals J ₆ and J′ ₆ are electrical connection terminals between the camera body and the lens, and the current from constant current source I ₃ flows into variable resistor VR ₃ via terminals J ₆ and J′ ₆ , so the terminal The potential of J ₆ is log ₂ (1+M/ψ) ² , where M=f/(l−f).

The circuit composed of resistors R ₃₀ , R ₃₁ , R ₃₂ and operational amplifier OA ₅ is an adder circuit, and based on the input potential from terminal J ₆ and terminal i′ ₁ , −{Avmax+log ₂ (1+M/ψ) ² } is output, and this is the resistor R ₃₃ ,
R ₃₄ and an operational amplifier OA ₆ , a potential corresponding to Avmax + log ₂ (1 + M/ψ) ² is outputted to the terminal i' ₂ , and is input to the subtraction circuit SU ₃ to obtain the effective minimum. The exposure time is calculated based on the aperture value.

In the embodiment shown in Fig. 4, _E3 is a constant voltage source so that the switching distance between flash light emission and flat light emission is constant. A variable voltage source may be used so that the output potential of E ₃ changes depending on the value. In this way, for example, the output potential of the variable voltage source _E3 can be changed to the second
If the potential corresponds to the distance A′ in the figure, then
The flash fires between C and A', the flash fires between A' and B', the exposure time is fixed at 1/125 and the aperture value changes, and the flash fires flat between B' and D. The aperture is fixed at the minimum aperture and the exposure time changes. Note that the distance for switching in this manner can be arbitrarily set anywhere between A' and B.

Furthermore, in order to perform exposure control based on the program (dotted chain line) in _FIG . During A-D, the aperture is controlled based on the aperture value calculated by the subtraction circuit _SU2 , and the exposure time is fixed at 1/1000.

Furthermore, by using the constant voltage source _E4 as a variable voltage source, the photographer can set the exposure time as desired (1/125 to 1/1000).
If the variable voltage source E ₄ outputs a potential corresponding to the set value, it becomes possible to set a fixed exposure time. For example, variable voltage source
If the output potential of _E4 is set to correspond to a shutter speed of 1/500, the flash will flash between C and A, and the flash will flash flat between A and B'', and the shutter speed will be fixed at 1/500. The aperture is controlled based on the aperture value from the subtraction circuit SU ₂ , and between B'' and D, the flash is flat, the aperture is set to the minimum aperture value, and the exposure time is controlled based on the output of the subtraction circuit SU ₃ . controlled.

At this time, if it were possible to set the distance at which flash light emission is switched to flat light emission, it would be necessary to modify a part of FIG. 4 to perform the following operation as shown in FIG. 8.

That is, as an operation, first, when it is set between A and B, the same operation as when it is set to A is performed as described above.

Next, when the setting is between A'-A, it is first determined whether the output Av of the subtraction circuit SU ₂ is smaller than the open aperture Avmin, and when Av<Avmin, the aperture control device C _A is Enter avmin and subtract su ₃
Avmin is input to calculate Tv=2. ^(k-Lv) +Sv-Avmin (8-3), and the exposure time is controlled by this calculated Tv. When AvAvmin, the aperture is controlled by the output Ax of the subtraction circuit SU ₂ , and
The exposure time controls the shutter according to the exposure time set by the variable voltage source _E4 . And the subtraction circuit
When the output Av of SU ₂ becomes Av>Avmax, the aperture is set to the minimum aperture as in Fig. 4, and Avmax is input to the subtraction circuit SU ₃ , Tv=2・^(k-Lv) +Sv−Avmax. ...(8-2) is performed, and the exposure time is controlled using the calculated Tv.

FIG. 8 shows an embodiment in which the operation described above is performed, and only the parts added to FIG. 4 are shown.
This operation means that the output Av of the subtraction circuit _SU2 is Av<
Avmin, the output of the comparator AC ₆ becomes High, and the analog switch AS ₆ outputs the Avmin signal from the voltage source E ₇ and inputs it to the aperture control device C _A. Also, the analog switch
AS ₇ similarly outputs the signal Avmin, and subtractor circuit SU ₃ outputs Tv shown by equation (8-3), which is input to shutter control device Cs via analog switch AS ₈ . Also, AvmaxAv
When Avmin (Av is the output of subtraction circuit SU ₂ ), the output of comparator AC ₆ is Low, and the output of comparator AC _{2 is} low.
The output of becomes High, and the subtraction circuit is used for the aperture control C _A.
Av from SU ₂ is input via analog switches AS ₃ and AS ₆ , and set Tv from voltage source E ₄ is input to shutter control device CS via analog switches AS ₄ , AS ₅ and AS ₈ . is input. At this time, the analog switch AS ₇ receives the voltage from the voltage source E ₆ .
Although the Avmax signal is output, the signal from the subtraction circuit _SU3 has no effect on exposure control. Av>
When Avmax is reached, the Avmax signal from the voltage source E ₆ is input to the aperture control device C A via the analog switches AS ₃ and AS ₆ , and is also input to the aperture control device C _A by the subtraction circuit SU ₃ (8
-2) Tv calculated based on the formula is input to the shutter control device via analog switches _AS5 and _AS8 .

FIG. 9 shows another embodiment of the photographing device according to the present invention. Components that are the same as in FIG. 4 are given the same reference numerals. In this example, the priority aperture value Avs
can be set, and a potential corresponding to this set value is output from the variable voltage source _E9 . Further, variable resistors VR ₄ , VR ₅ , and VR ₆ are for setting film sensitivity, and the resistance values at the slider positions are the same.

In adder circuit AD ₁ , variable voltage source E ₉ and constant voltage source
The calculation (Avs+Tvc ₂ ) is performed based on the signal from E ₄ , and further the calculation 2·k−(Avs+Tvc ₂ ) is performed in the subtraction circuit SU ₆ . Therefore, the potential at the slider position of variable resistor VR ₅ is 2・Lvs=2k+Sv−(AVs+Tvc ₂ )
...(8-4) This potential and the potential (2・Lv) corresponding to the distance input from terminal _J1 are the comparator.
Av ₇ is compared and it is determined whether to use flat flash mode or flash flash mode (2・Lvs<
2・Lv), the output of comparator _AC7 is
It becomes Low and enters flash light emission mode, while when (2・Lvs2・Lv), comparator AC ₇
The output becomes High and the flat light emission mode is established.

When the output of comparator AC ₇ is low and the flash light emission mode is in effect, the potential (2・Gv−5) corresponding to the guide number from constant voltage source E ₁ and the potential corresponding to (2・Lv) from terminal J ₁ are The potential at the slider position of the variable resistor VR ₄ , which is input to the subtraction circuit SU ₅ , is Av = 2・^(Gv-Lv) + (Sv-5) ...(5), and the signal of this equation (5) But the comparator AC ₇ ,
Since the output of _AC8 is low, the analog switch
It is sent to the aperture control device C _A via AS ₁₀ and AS ₁₂ , and the open aperture value is determined by the comparator AC ₃ .
When it is compared with Avmin and Av<Avmin, the output of comparator _AC3 becomes Low and the light emitting diode lights up to give a warning that the long-distance interlocking is not possible. Also,
Since the outputs of the comparators AC ₇ and AC ₈ are low, the potential corresponding to the flash light emission tuning limit shutter speed Tvc ₁ from the constant voltage source E ₅ is input to the shutter control device Cs via the analog switches AS ₁₁ and AS ₁₃ . be done.

When the output of the comparator AC ₇ is High at (2・Lvs2・Lv) and the flat light emission mode is selected, the subtraction circuit SU ₆ performs the calculation of (2・^(k-Lv) ), and the sliding of the variable resistor VR ₆ is performed. A potential corresponding to (2・^(k-Lv) +Sv) is output from the mover. Then, the subtraction circuit _SU8 performs the following calculation: Tv=2. ^(k-Lv) +Sv-Avs (8-5), and outputs a potential corresponding to Tv. Then, this output potential is compared with a potential corresponding to the shortest exposure time Tvmax from a constant voltage source by a comparator _AC8 .

When Tv≦Tvmax, the output of comparator AC ₈ is Low, and the output of comparator AC ₇ is
Since it is High, the signal of the set aperture value Avs from _{the variable voltage source E9 is} input to the aperture control device C _A via the analog switches AS10 and _AS12 .

On the other hand, the exposure time Tv signal from the subtraction circuit _SU8 is input to the shutter control device _C8 via analog switches _As11 and _As13 .

When Tv > Tvmax, the output of comparator AC ₃ becomes High, FET and FT ₅ conduct, and the potential corresponding to the shortest exposure time Tvmax is applied to subtraction circuit SU ₉
is input, and the subtraction circuit SU ₉ performs the following calculation: Av=2. ^(k-Lv) +Sv-Tvmax (8-6). This calculated aperture value Av is then input to the aperture control device C _A via the analog switch AS ₁₂ , and is also input to the comparator AC _9.
When Av>Avmax, the output of comparator _AC9 becomes Low, and the light emitting diode lights up to warn that the short distance interlock is not working. On the other hand, the analog switch
Since the output of comparator AC ₈ is High, AS ₁₃ outputs the Tvmax signal from constant voltage source E ₈ ,
This is input to the shutter control device.

Various other modifications can be made to the embodiment of the present invention; for example, the variable voltage source _E9 in FIG. Set _E4 as a variable voltage source so that the signal of the set exposure time is output. In this way, first 2・Lvs=2k+Sv−(Avc+Tvs)
...(8-7) Compare the value with Lv to determine whether the flat light emission mode is the flash light emission mode. Then, in the flat flash mode, the exposure is controlled by the aperture value Av and exposure time Tvs according to Av=2・^(k-Lv) +Sv-Tvs (8-8),
When Av>Avmax, the exposure can be controlled using the exposure time Tv and the aperture value Avmax as follows: Tv=2· ^(k-Lv) +Sv-Avmax (8-2).

Therefore, the program shown in FIG. 2 can be realized as follows. First, up to the distance A, the flash mode is the same as above, and between A and B', the aperture is controlled to the aperture value Avc (FNo. = 8) and the exposure time Tv = 2・^(k-Lv) − Controlled by the value of Sv−Avc...(8-9), Tv>Tvmax according to formula (8-9)
In other words, between B and D, the aperture is controlled by Av=2・^(k-Lv) +Sv-Tvmax...(8-6), and the exposure time is Tvmax.
Control with.

As mentioned above, this program can also be modified so that the distance and aperture value at which the mode changes can be set, and the various programs mentioned above can be implemented with a single camera. It is also possible to allow the photographer to select which program to use.

In this embodiment, the distance signal is obtained from the distance ring of the photographic lens, but it may also be obtained from, for example, a distance detection device. Also, switch
Instead of S ₂ , a switch for starting counting the exposure time or a signal from the FP contact may be used as the light emission start signal, or a signal from the counting start switch or FP contact may be used as the light emission start signal. It is also possible to start flat light emission with a signal from a planning circuit that counts the time until the start of exposure.Furthermore, it is possible to start counting with a camera release signal, count for a certain period of time, and then start light emission with a count end signal. You may start it.

Although analog circuits are used in this embodiment, it is also possible to use digital circuits.

Furthermore, when the subject distance is shorter than D, it is possible to expand the range of motion by decreasing the potential at the non-inverting input terminal of the comparator _AC5 in FIG. 4 in accordance with the distance signal.

Effects As detailed above, one of the photographic devices using the auxiliary light according to the present invention includes a focal plane shutter having a leading curtain and a trailing curtain, and a movement of the leading curtain of the focal plane shutter. a first light-emitting means that starts emitting light in conjunction with the start of light emission, and emits light that contributes to exposure to the film while the focal plane shutter operates and exposure to the film is performed; and a focal plane; A second light emitting device emits a short flash when the shutter is fully open; a distance information output device outputs distance information regarding the distance to the subject; a selection means for selecting a first light emitting means when the value is larger than a predetermined value and a second light emitting means when the value is smaller than a predetermined value; a film sensitivity information output means for outputting film sensitivity information regarding film sensitivity; aperture value information output means for outputting aperture value information regarding the value;
exposure time calculation means for calculating an exposure time according to distance information, film sensitivity information and aperture value information when the light emitting means is selected;
an aperture value information means for calculating an aperture value according to the distance information and film sensitivity information when the first light emitting means is selected; and an aperture value information means for calculating the aperture value according to the aperture value information when the first light emitting means is selected by the selection means. Finally, when the second light emitting means is selected, the aperture control means controls the aperture based on the calculated aperture value, and when the first light emitting means is selected by the selection means, the exposure time is calculated. and shutter control means for controlling the focal plane shutter based on the following, and for controlling the focal plane shutter to be fully open when the second light emitting means is selected. Another aspect of the photographing device of the present invention using auxiliary light includes a focal plane shutter having a front curtain and a rear curtain, and emits light in conjunction with the start of running of the front curtain of the focal plane shutter. start,
a first light emitting means that emits light that contributes to the exposure of the film while the focal plane shutter is operating and the film is exposed; and a first light emitting means that emits light for a short time when the focal plane shutter is fully opened. a second light emitting means for performing the above, and a distance information output means for outputting distance information regarding the distance to the subject;
a selection means for determining whether the distance information is larger or smaller than a predetermined value and selecting a first light emitting means when the distance information is larger than the predetermined value and selecting a second light emitting means when the distance information is smaller than the predetermined value; and a film sensitivity. film sensitivity information output means for outputting film sensitivity information related to exposure time; exposure time information output means for outputting information regarding exposure time; and distance information, film sensitivity information and exposure when the first light emitting means is selected by the selection means. a first aperture value calculation means for calculating an aperture value according to time information; and a second aperture value calculation means for calculating an aperture value according to distance information and film sensitivity information when the second light emitting means is selected by the selection means. an aperture value calculation means; an aperture control means for controlling the aperture based on the calculated aperture value; and a focal plane shutter for controlling the focal plane shutter based on exposure time information when the first light emitting means is selected by the selection means. and a shutter control means for controlling the focal plane shutter to be fully open when the second light emitting means is selected. When shooting using fill light with a focal plane shutter that has a trailing curtain, in addition to the conventional flash emission when the shutter is fully opened, the shutter starts firing in conjunction with the start of the front curtain's movement, and the exposure to the film is improved. By combining the light emission that contributes to the exposure of the film while the flash is being performed, the shooting distance can be extended to the short distance side compared to conventional flash automatic devices that only use flash light emission, and the aperture can be increased. It is possible to provide a photographing device that can emit light preferentially or preferentially based on shutter speed.

[Brief explanation of drawings]

FIG. 1A is a light emission waveform diagram of the light emitter according to the present invention;
Fig. 1B is an explanatory diagram of the operation of the front and rear curtains of a focal plane shutter, Fig. 2 is a program diagram showing the relationship between distance, aperture value, and exposure time according to the present invention, and Fig. 3 is a diagram showing the relationship between distance, aperture value, and exposure time according to the present invention. FIG. 4 is a diagram showing the mechanical part of the photographing device, and FIG. 4 is an example of the circuit of the camera according to the present invention.
Figures A and B are circuit examples of the analog switch in Figure 4.
FIG. 6 is a circuit example of a light emitter according to the present invention, FIG. 7 is a circuit for exposure compensation, FIG. 8 is a circuit diagram showing a modification of FIG. 4, and FIG. 9 is another circuit of a camera according to the present invention. This is an example. 3...303; Light emitter, VR ₁ ... Variable resistor for distance signal, AC ₁ ... Comparator, S ₁ ... Switch for starting flash light emission (X contact), S ₂ ... Switch for starting flat light emission, C _A ...Aperture control device, Cs...
Shutter control device.

Claims (1)

[Scope of Claims] 1. A focal plane shutter having a front curtain and a rear curtain, and a focal plane shutter that starts emitting light in conjunction with the start of running of the front curtain of the focal plane shutter, and operates the focal plane shutter. a first light emitting device that emits light that contributes to the exposure of the film while the film is being exposed; and a second light emitting device that emits a short flash of light when the focal plane shutter is fully open. , distance information output means for outputting distance information regarding the distance to the subject; determining whether the distance information is larger or smaller than a predetermined value; a selection means for selecting the second light emitting means; a film sensitivity information output means for outputting film sensitivity information regarding the sensitivity of the film; an aperture value information output means for outputting aperture value information regarding the aperture value; Exposure time calculation means for calculating an exposure time according to distance information, film sensitivity information and aperture value information when the first light emitting means is selected; aperture value information means for calculating an aperture value according to information and film sensitivity information; an aperture control means that controls the aperture based on the calculated aperture value when selected; and a focal plane shutter that controls the focal plane shutter based on the calculated exposure time when the first light emitting means is selected by the selection means. A photographing device using auxiliary light, further comprising: shutter control means for controlling the focal plane shutter to be fully open when the second light emitting means is selected. 2. A focal plane shutter that has a leading curtain and a trailing curtain, and starts emitting light in conjunction with the start of running of the leading curtain of the focal plane shutter, and the focal plane shutter operates to expose the film. a first light emitting device that emits light that contributes to the exposure of the film while the focal plane shutter is being exposed; a second light emitting device that emits a short flash when the focal plane shutter is fully open; distance information output means for outputting distance information; determining whether the distance information is larger or smaller than a predetermined value; when the distance information is larger than the predetermined value, the first light emitting means is emitted; when it is smaller than the predetermined value, the second light emitting means is emitted; a selection means for selecting a means; a film sensitivity information output means for outputting film sensitivity information regarding the sensitivity of the film; an exposure time information output means for outputting information regarding an exposure time; and a first light emitting means is selected by the selection means. a first aperture value calculation means that calculates an aperture value according to distance information, film sensitivity information, and exposure time information when the second light emitting means is selected by the selection means; a second aperture value calculation means for calculating an aperture value according to the aperture value; an aperture control means for controlling the aperture based on the calculated aperture value; and an exposure time information when the first light emitting means is selected by the selection means. and a shutter control means for controlling the focal plane shutter based on the following, and for controlling the focal plane shutter to be fully open when the second light emitting means is selected. A photographic device that uses light.