JPS642930B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention is a photographing device using an auxiliary light suitable for a camera having a focal plane shutter, etc., in which a conventional flash-matic is improved so that the photographing range is wider. Regarding the photographic device.

Prior Art Conventionally, the following three types of flash devices are mainly used when taking 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 diaphragm 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. distance,
With the reflectance method, it is possible to take pictures at fairly close distances, but because the aperture is specified, the depth of field is insufficient for close-up photography, and at the same time, it has the drawback of being affected by the reflectance of the subject. The film surface reflected light metering method has the drawback that it is not only affected by the reflectance of the subject, but also includes the reflectance of the film itself as a factor of error during light adjustment.

OBJECT OF THE INVENTION The present invention aims to eliminate the above-mentioned conventional drawbacks and provide a new photographing device with a wider photographing range. By adding to the conventional flash mechanical mechanism a combination of high shutter speed and light emission that contributes to the exposure of the film while the focal plane shutter operates and exposes the film. , the flash mechanical mechanism has a wider shooting distance range than the conventional flash mechanical mechanism, and also has more freedom in shutter speed and aperture, and is unique in that the aperture and shutter speed can be programmed according to the distance. .

That is, the photographing device according to the present invention includes a focal plane shutter having a front curtain and a rear curtain;
It starts emitting light in conjunction with the start of the front curtain of the focal plane shutter, and while the focal plane shutter is operating and exposing the film, it emits light that contributes to the exposure of the film. A first light emitting means, a second light emitting means that emits a short flash when the focal plane shutter is fully open, a distance information output means that outputs distance information regarding the distance to the subject, and a distance information output means that outputs distance information regarding the distance to the subject; a selection means for determining whether the film is larger or smaller and selecting a first light emitting means when it is smaller than a predetermined value and selecting a second light emitting means when it is larger than a predetermined value; and film sensitivity information regarding film sensitivity. film sensitivity information output means for outputting film sensitivity information; second calculation means for calculating an aperture value according to the distance information and film sensitivity information when the first light emitting means is selected by the selection means; When the light emitting means is selected, the aperture is controlled based on the aperture value calculated by the first calculation means, and when the second light emission means is selected, the aperture is controlled based on the aperture value calculated by the second calculation means. an aperture control means for controlling the aperture based on the exposure time calculated by the first calculation means when the first light emitting means is selected by the selection means; This is a photographing device using an auxiliary light, characterized in that it has a shutter control means that controls the focal plane shutter to be fully open when the light emitting means is selected, and is compared to a normal strobe photographing device. This has many effects, such as widening the photographing range and enabling photographing with a combination of aperture and exposure time suitable for close-up photography.

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. Constant light intensity I ₀ with light emission waveform 2
This is a flat emission (constant intensity emission) waveform that continues emission for a long time _T0 . Here, T ₀ is the time from when the shutter on the camera side begins to open until it completely blocks light. 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) S=2 ^Sv , F=√2 ^Av ,
When formula (1) is logarithmically compressed and expressed as L=2 ^Lv , it becomes Av=Sv−2·Lv+log ₂ P+2·log ₂ a (2). In addition, 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
Assuming GN (=2 ^Gv ), GN=a√2 ⁵・=2 ^Gv (3). From equation (3), 2Gv−5=log ₂ P+2・log ₂ a …(4) is obtained. Therefore, from equations (2) and (4), Av = 2 (Gv - Lv) + (Sv - 5) ... (5), and equation (5) is a normal method that determines the aperture based on the guide number, distance, and film sensitivity. This is the aperture calculation formula for the flash automatic flash.

In the case of light emission (b), the factor of shutter speed is included to determine the aperture. This will be explained below. When the effective light emission amount contributing to film exposure at shutter speed T (2 ^-Tv ) is P', P'=I ₀ .T=I ₀ .22 ^-Tv (6). If P is replaced with P' in equation (2), Av=Sv-2・Lv-Tv +(log ₂ I ₀ +2・log ₂ a) …(7) log ₂ I ₀ +2・log ₂ a=2・If we set k (k: constant determined by luminous intensity I ₀ ), equation (7) becomes Av = 2 (k - Lv) + Sv - Tv ... (8), and the distance to the subject, film sensitivity, shutter speed We obtain a general calculation formula for flat light emission for aperture determination (or shutter speed determination).
Also, from equations (6) and (3), GNe=a√2 ⁵・₀・ …(9) Here, if we approximately set P′=I ₀ T ₀ =P, get. Equation (10) shows the guide number equivalent amount GNe depending on the shutter speed when flat light emission is used.

Figure 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 pictures of objects at even closer distances than with a flash camera, 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 shooting 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. time T ₀
is determined. In other words, using a focal plane shutter as an example, the curtain speed of the first curtain is 13ms (time to run between screens), and the exposure time (shutter speed).
8ms, T ₀ = 22ms with some 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,
At 1/250, GNe≒12, and at 1/125, GNe≒17.

Therefore, in the conventional flash
The shooting range was 10m (F2.8) to 1.3m (F22), but in this example it was 10m (F2.8) to 0.27m.
The range can be extended to (F22). In the program shown in the figure (thick solid line), in order not to reduce the far point in the distance between C and A, as in the past,
Synchronize the shutter fully open with a flash mechanical with GN = 28, effectively utilize the light emission, determine the aperture based on equation (5), and then set the shutter speed to 1/12 at point A.
5. After 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 formula (8), and GN = 17. Equivalently, and furthermore, the closest distance point D from point B′
The program up to this point fixes the minimum aperture to Avmax, determines the shutter speed based on equation (8), and obtains the same result as when changing the amount of light emitted by the light emitter. In the program, the setting of point A can be arbitrarily set between A' and B.

The broken line indicates that normal flash photography is performed up to the distance A, and program exposure control as shown in the figure is performed from the distance A to D. In other words, if the distance is 1.1m, the combination of aperture and exposure time is F11, 1/250sec, and 0.54m.
Like a normal program shutter, the aperture and exposure time change according to changes in distance, such as f/16 and 1/500sec.

FIG. 3 shows a specific embodiment of the present invention, in which 1 is a camera body 2 is a photographing lens (in the embodiment shown in FIG.
A 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 attached, the terminals J ₁ and J ₂ are electrically connected to J' ₁ and J' ₂ , respectively, and in conjunction with the distance ring 2b of the photographic lens 2, information on the photographing distance is transmitted.
VR ₁ is variable and transmits shooting distance information to the camera body 1 through terminals 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 the focal plane shutter built into camera body 1, 11 is the front curtain interlocking gear, and curtain shaft 17
It engages with the front curtain gear 15a, which is also integrated with the curtain shaft 1.
It is interlocked with the front curtain slit 18 through the front curtain tubes 15 and 16 which are integrated with the front curtain tube 7. 12 is the rear curtain gear and the rear curtain cylinder 14
It engages with a trailing gear 14a integral with the trailing curtain slit 19 and interlocks with the trailing curtain gear 14a. 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. 2
A 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 magnetic flux of the permanent magnet 31, and the lever 2 is biased clockwise by a spring 41.
1 demagnetizes the magnetic flux of the permanent magnet by energizing 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 rear curtain and has the same configuration as Mg ₁ , and the lever 20, which is attracted and held by the magnetic flux of the permanent magnet 30, is rotated clockwise by a spring 40 when Mg ₂ is energized. Then, the engagement with the engagement pin 12a on the trailing curtain interlocking gear 12 is released, and as a result, the engagement of the trailing curtain is released and the trailing curtain slit 19 runs.

In the figure, C, Cd, Co, Cs, and C _A indicate circuit blocks. C〓 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 Further, this circuit is used to set tuning speed information, shutter speed during flat light emission, maximum shutter speed, minimum and maximum F value of the photographing lens, film sensitivity, etc. Cd is a discrimination circuit that discriminates the type of light emission waveform of the flash device, and it determines whether it is flash light emission or flat light emission based on the distance information VR ₁ from the photographing lens 2 and the distance information of the light emission switching point set by the information setting circuit C〓. This is a circuit that performs discrimination. Co is an arithmetic circuit that calculates the information set by the information setting circuit C〓.If the result of the discrimination circuit Cd is flash emission, it sets the shutter speed to the synchronized speed, and also sets the distance from the photographing lens, film sensitivity, and emitter. The aperture value is calculated from each information of the guide number, and if the determination circuit Cd determines that the flash is flat flash, the aperture value is calculated from the information of the flat flash intensity, distance, and film sensitivity at the set shutter speed (higher than the sync speed). Either determine the value, or calculate the shutter speed from the flat light intensity and distance film sensitivity information at the set aperture value. Cs and C _A are a shutter control circuit and an aperture control circuit, respectively, and control the shutter speed and aperture based on the output of the arithmetic circuit Co. S ₁ and S ₂ are a flash light emission drive switch and a flat light emission drive switch, respectively. S ₁ is a normally open type switch that is closed by a pin 11a that is integrated with the front curtain interlocking gear 11 of the shutter SH; At the end of the rotation of the curtain interlocking gear 11, that is, after the front curtain slit 18 passes the end of the opening 1c of the camera body 1, it is closed. _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 _S1 is fully open, S1 is conductive and the light emitter 3 is driven to emit light, but _S2 is not conductive in terms of the circuit.
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 opened by a known mechanism (not shown) after the trailing curtain has completed running.

FIG. 4 is an example of the program shown in FIG. VR ₁ is a variable resistor whose slider moves according to the position of the distance ring, which is installed on the lens side.
Terminals J ₁ , J' ₁ and J ₂ , J' ₂ are constant current circuits that supply a constant current to a variable resistor VR _{1 and a terminal I 1 for} electrical contact between the lens and the camera body. 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 the terminal J ₁ corresponds to 2·log ₂ L=2·Lv.

E ₃ is a constant voltage source that outputs the potential 2·Lvc corresponding to the distance shown in Figure 2 A, AC ₁ is a comparator that compares the potential of terminal J ₁ and the output potential of constant voltage source E ₃ .
E ₁ is a constant voltage source that outputs a potential corresponding to 2·G _v-5 , and E ₂ is a constant voltage source that outputs a potential corresponding to 2·k. AS ₁ is an analog switch as shown in Figure 5A, and the output of comparator AC ₁ is low.
When , the signal from constant voltage source E ₁ is output and High
When , a resistor that outputs the signal from constant voltage source E ₂
A circuit composed of _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 FEH (FT ₃ ) is turned on and the p-channel FETs (FT ₂ ) and (FT ₄ ) are turned on. OFF, terminal j ₁
The signal from is output to terminal j ₃ , and terminal j ₂ is in a state where there is no signal. On the other hand, when the output of comparator AC ₁ is “Low”, the n-channel FET (FT ₃ )
OFF, P channel FET (FT ₂ ), (FT ₄ ) are ON
Therefore, the signal from terminal j ₁ is output to terminal j ₂ , and terminal j ₃ becomes ground potential.

E ₄ is a fixed shutter speed Tvc ₂ (e.g. 1/125
Constant voltage source and resistor that output a potential corresponding to sec)
The circuit composed of _R5 to _R8 and the operational amplifier _OA2 is a subtraction circuit _SU2 . _E6 is a voltage source that outputs a potential corresponding to the minimum aperture (Avmax) of the lens.
For example, it outputs a potential depending on 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 output terminal j ₂ of analog switch AS ₂ or operational amplifier OA ₂ . Outputs the potential from the output terminal.

_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 the potential from constant voltage source E ₄ when the output of comparator AC ₁ is High, and outputs the potential from constant voltage source E ₅ when the output of comparator AC 1 is Low. This is an analog switch that outputs. The circuit composed of resistors R ₉ to R ₁₂ and operational amplifier OA ₃ is subtractor circuit SU ₃ , and AS ₅ is comparator AC _2.
When the output is High, it outputs the signal from the analog switch AS ₄ , and when it is Low, it outputs the signal from the operational amplifier.
This is an analog switch that outputs the output potential of _OA3 .

LD ₂ is a light emitting diode that indicates that the amount of light emitted by 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 potential of the 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. First, when the subject is within the distance range from C to A in Figure 2, the potential of terminal _J1 is higher than the output potential of constant voltage source _E3 , and the output of comparator _AC1 is Low.
It's getting old. Therefore, the analog switch AS ₁ receives the guide number of the light emitter 303 from the constant voltage source.
A potential corresponding to 2Gv-5 is output, and this signal and the distance signal 2Lv from the terminal _J1 are input to the subtraction circuit _SU1 to perform the calculation of (2Gv-5-2Lv). 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 terminal _j2 of 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. Also, since the output of comparator AC ₁ is low, the n-channel FET (FT ₁ ) becomes non-conducting.
The potential of terminal j ₂ remains the potential of the slider of 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. This is input to the aperture control circuit C _A and the comparator AC ₃ , and the aperture is It is controlled by the value calculated by 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 coparator _AC3 becomes Low, the light emitting diode _LD1 lights up, and the light emitter 303 Displays that the amount of light emitted by the camera 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, the signal that the X contact _S1 is closed is sent to the strobe 3.
Since the terminal _J'4 is low, the light emitter 3 emits 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, from analog switch AS ₁ , 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 (1/125
sec) subtraction circuit SU ₂ along with the potential corresponding to Tvc ₂
is input. Therefore, the subtraction circuit _SU2 outputs a potential corresponding to Av=2.(k-Lv)+Sv- _Tvc2 (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, from analog switch AS ₃ , n-channel
A potential corresponding to the calculated aperture value Av input via the FET (FT ₁ ) is output, 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 (1/125
sec). Furthermore, since the output of the comparator AC ₁ is High, the transistors Q ₁ and Q ₃ are conductive and the transistor Q ₂ is non-conductive. Therefore,
A switch that is closed when the shutter begins to open.
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 D from B' will be explained. In this case, the aperture value calculated according to formula (8-1) output from the subtraction circuit _SU2
Since the potential corresponding to Av is greater than the potential corresponding to the minimum aperture value Avmax from the voltage source _E6 , the output of the comparator _AC2 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.

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 Tv=2・(k−Lv)+Sv−Avmax
...(8-2) A potential corresponding to the following 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, the calculated shutter speed Tv is the maximum shutter speed.
Comparator AC ₄ when greater than Tymax
The output becomes Low, and the light emitting diode LD ₂ lights up to warn that the amount of light emitted from the light emitter 303 is out of short-range synchronization. Furthermore, the light emitter 303 emits flat light when the shutter starts to open.

6 and 4 are specific circuit examples of the light emitter 303. B ₁ is the power battery, S ₃ is the power switch,
404 is a booster circuit, C ₁ is a main capacitor, Ne 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 _S1 is input to the strobe side, as described above.
When the X contact S ₁ is closed, the transistors Q ₄ , Q ₅
becomes conductive, and the potential at the connection point of resistors R ₁₈ and R ₁₉ becomes
As a result, thyristor SC ₁ becomes conductive, trigger circuit 505 operates, and xenon tube
A trigger is applied to Xe. Also, since the terminal _J'4 is low, the transistor _Q8 does not conduct. Therefore, X
When contact S ₁ closes, transistor Q ₆ becomes conductive,
Transistor Q ₇ is non-conducting, transistor Q ₉ is conducting, and transistor Q ₁₀ is conducting. Therefore, the potential at the connection point between the resistors 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, causing the transistor
Q ₁₁ becomes non-conductive and Q ₁₂ remains conductive. Therefore, the output of comparator AC ₅ is Low
As it is, transistor _Q13 does not conduct.

On the other hand, when terminal J' ₄ is High, the signal from switch S ₂ , which is closed when the shutter starts to open, is transmitted to light emitter 3.
03. When switch _S2 is closed,
The transistors Q ₄ and Q ₅ and the thyristor SC ₁ become conductive, and the xenon tube Xe is triggered. Further, since the transistor Q ₈ is conductive, the transistors Q ₉ and Q ₁₀ and the 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 AC ₅ is inverted low and transistor Q ₁₃ becomes non-conducting. Then, due to the energy magnetically stored in the coil L, a current flows through the diode D ₁ and the xenon tube Xe, and the emission intensity of the xenon tube Xe further increases and then gradually decreases, and the phototransistor PT The output current of the transistor Q13 also decreases, and the potential at the connection point between the phototransistor PT and the resistor _R15 becomes lower than the potential at the connection point between the resistors _R13 and _R14 , and the output of the comparator _{AC5 becomes} High. conducts. Then, due to the response delay of the xenon tube Xe, the emission intensity further decreases and then increases. By repeating the above operations at a much higher speed than the light emission time of the xenon tube Xe, the xenon tube Xe emits flat light with a substantially constant emission intensity as shown in FIG. 1A.

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 an embodiment that realizes the combination of aperture and exposure time shown in FIG. 2. That is, when the mode is set to flat light emission, the aperture and exposure time are combined in a straight line according to the distance, like program exposure.

The configuration and operation of FIG. 7 will be explained below. Note that the same circuits as in FIG. 4 are given the same reference numerals. Similarly to Figure 4, if a signal from a distance farther than A is input from terminal J ₁ , the output of comparator AC ₁ will be
The analog switch AS ₂₁ outputs the aperture signal Av=2・(Gv−Lv)+(Sv−5) from the variable resistor VR ₂ , and the analog switch AS ₂₃ outputs the aperture signal Av=2・(Gv−Lv)+(Sv−5) from the constant voltage source _E5 . A signal with a constant exposure time Tvc ₁ (1/60) is output. Then, the aperture and exposure time are controlled to these values, and normal flash light emission is performed.

When the signal from terminal J ₁ is closer than the distance from A, the output of comparator AC ₁ becomes Low and the variable resistor
The output of VR ₂ corresponds to 2・(k-Lv)+Sv. The signal corresponding to the shortest exposure time Tvmax (1/1000) from the constant voltage source _E8 is input to the subtraction circuit _SU20 , and the calculation of Avap=2・(k−Lv)+Sv−Tvmax is performed. . This Ava is 1/1000 of the figure 2
Corresponds to the aperture value determined by a straight line on GNe ₆ . The variable voltage source _E6 outputs a signal corresponding to the minimum aperture value Avmax, and the resistors _R20 and _R21 have the same resistance value. Therefore, the potential at the connection point between resistors R ₂₀ and R ₂₁ is Avp=(Ava+Avmax)/2, and this Avp is the aperture value determined by a straight line. In addition, the subtraction circuit SU ₂₁ has a variable resistor VR ₂
The signal 2(k-Lv)+Sv from 2(k-Lv)+Sv and the signal Avp from the connection point of resistors _R20 and _R21 are input, and Tvp=2.(k-Lv)+Sv-Avp is calculated. This signal Tvp is a signal corresponding to the exposure time defined by the straight line in FIG.

The comparator AC ₂₀ compares the signal Avp from the connection point of the resistors R ₂₀ and R ₂₁ with the minimum aperture signal Avmax from the variable voltage source E ₆ , and when Avp≦Avmax, the output becomes High. As a result, the analog switch AS ₂₀ outputs the signal Avp, and the analog switch AS ₂₂ outputs the signal Tvp. Since the output of comparator AC ₁ is low, analog switches AS ₂₁ and AS ₂₃ are output as analog switches AS ₂₀ and AS 23, respectively.
Signals Avp and Tvp are output from AS ₂₂ , and the aperture and exposure time are controlled to values corresponding to these signals Avp and Tvp, respectively, to perform flat light emission.

Furthermore, when Avmax<Avp, the output of comparator AC ₂₀ becomes "Low", and the analog switch AS ₂₀ outputs the minimum aperture signal Avmax from the variable voltage source E ₆ , and the analog switch AS ₂₂ outputs the constant voltage source. A signal Tvmax indicating the shortest exposure time is output from _E8 , and the light is controlled to a value corresponding to this signal to perform flat light emission. Furthermore, the light emitting diode LD ₂ lights up to warn you that you are too close.

As a modification of this embodiment, the ratio of the resistance values of the resistors R ₂₀ and R ₂₁ may be set to other than 1:1, and further, for example, the ratio may be changed at the position B' so that the ratio becomes a broken line. Good too. Also, variable voltage source E ₆
and the constant voltage source _E8 , the subtraction circuit _S20 outputs Tva=2・(k−Lv)+Sv−Avmax, and the connection point between the resistors _R20 and _R21 outputs Tvp.
=(Tvmax−Tva)/2 may be output.

Furthermore, the straight line shown in FIG. 2 may be realized by one camera, and the photographer may be able to select which straight line to use. Further, the distance information may be obtained by a distance detection device.

Effects As detailed above, the photographing device using fill light according to the present invention has a focal plane shutter having a leading curtain and a trailing curtain, and a focal plane shutter that is linked to the start of travel of the leading curtain of the focal plane shutter. and start emitting light.
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 device that outputs distance information regarding the distance to the subject; a distance information output device that determines whether the distance information is larger or smaller than a predetermined value; a selection means for selecting the second light emitting means when the light emitting means is larger than a predetermined value; a film sensitivity information output means for outputting film sensitivity information regarding the sensitivity of the film; and a selection means for selecting the first light emitting means. first calculation means for calculating the aperture value and exposure time so that both the aperture value and the exposure time change according to the distance information and a predetermined relationship according to the distance information and the film sensitivity information when and a second 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 when the first light emitting means is selected by the selection means. , controlling the aperture based on the aperture value calculated by the first calculation means, and
When the second light emitting means is selected, the aperture control means controls the aperture based on the aperture value calculated by the second calculation means, and when the first light emitting means is selected by the selection means, the first light emitting means is controlled. Shutter control means for controlling the focal plane shutter based on the exposure time calculated by the calculation means, and for controlling the focal plane shutter to be fully open when the second light emitting means is selected. This is a photographic device that uses an auxiliary light, which is characterized by the fact that the auxiliary light can be switched between flash light emission and flat light emission, and it is also possible to realize a program shutter according to distance information. Compared to a strobe photography device, this camera has excellent advantages such as a wider photographing distance range and the possibility of photographing with a combination of aperture and exposure time suitable for close-up photography.

[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 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 mechanical part of the photographing device according to the present invention. 4 is an example of the circuit on the camera side according to the present invention, and FIGS. 5A and 5B are the fourth example.
The figure shows an example of the analog switch circuit, FIG. 6 shows an example of the circuit of the light emitter according to the invention, and FIG. 7 shows another example of the circuit on the camera side according to the invention. 3,303...Light emitter, SH...Focal plane shutter, VR ₁ ...Distance information generation means,
AC ₁ ...Switching means, _E2 ...Emission intensity information generation means, VR ₂ ...Film sensitivity information generation means,
SU ₂₀ , R ₂₀ , R ₂₁ , E ₆ ... calculation means.

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 means that emits light that contributes to the exposure of the film while the film is being exposed; and a second light emitting means that emits a short flash of light when the focal plane shutter is fully opened. , 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 when the first light emitting means is selected by the selection means; a film sensitivity information output means for outputting film sensitivity information regarding the sensitivity of the film; a first calculating means for calculating the aperture value and the exposure time so that both the aperture value and the exposure time change according to the sensitivity information according to a predetermined relationship with the distance information; a second calculation means that calculates an aperture value according to the distance information and film sensitivity information when the light emission means is selected; aperture control means for controlling the aperture based on the aperture value calculated by the second calculation means when the second light emitting means is selected; When the first light emitting means is selected, the focal plane shutter is controlled based on the exposure time calculated by the first calculation means, and when the second light emitting means is selected, the focal plane shutter is fully opened. 1. A photographing device using an auxiliary light, comprising: a shutter control means for controlling the shutter so that the shutter is in the correct state;