JPH01314229A - Multi-lamp flash photographing device - Google Patents

Abstract

PURPOSE:To prevent irradiating irregularity by detecting the magnification relationship among the photographing view angles and flash irradiation angles of plural flash devices and making only the flash device whose flash irradiation angle is identical to or larger than the photographing view angle generate light, based on the detected result. CONSTITUTION:The irradiation angle of each flash device is detected, and only the one whose irradiation angle is identical or larger than the photographing view angle is permitted to generate light. Namely, when the focal distance of a zoom lens is set at the widest angle, the irradiation angle is insufficient even if an external flash device 6 generates light in response to the widest irradiation angle, and a built-in flash device 5 also has an insufficient irradiation angle, whereby no flash device is permitted to generate light. If the flash irradiation angle of only the external flash device 6 can cope with the photographing lens, its flash is permitted. However, the built-in flash device 5 has an insufficient irradiation angle, whereby its flash is not permitted. As a result, irradiation irregularity can be automatically prevented which occurs when plural flash devices flash simultaneously.

Description

[Detailed Description of the Invention] [Industrial Application Field] When taking photographs using a plurality of flash devices with various light emission angles, the present invention provides a method for determining the angle of view of the photographing lens and the angle of view of each flash device. The present invention relates to a flash photography device that determines the appropriateness of a combination of irradiation angles and irradiates a copy with desired flash light.

(Prior Art) Conventionally, a proposal for determining the state of the shooting angle of view of a camera and the illumination angle of a flashlight emitting device was proposed in Japanese Patent Publication No. 54-31688 (
A signal member is provided on the interchangeable lens that has an angle of view wider than the light emitting angle of the flash device being used, and when this TA shadow lens is attached to the camera, this signal is emitted. There were some parts that automatically disabled the camera's flash photography due to the output from the parts.

Also, as a flashlight emitting device, a so-called zoom strobe that can change the irradiation angle is assumed, and a device that displays an alarm when the irradiation angle of the flash device differs from the viewing angle of the photographing lens was developed in 1983.
-87029 (irradiation angle control device for flash device).

[Problem to be solved by the invention]

For example, when changing lenses and taking photos using multiple flash units, each with a different firing angle, compare the angle of view of the replacement lens with the firing angle of each flash unit, and compare all flash units. Unless you make sure that the device has a wider illumination angle than the shooting angle of view, uneven illumination may occur. In other words, if you accidentally fire a flash device with a narrow beam angle that cannot be used, resulting in uneven illumination, or if you are using a zoom lens, the focal length and flash beam angle may initially correspond properly, but the focus When emitting light while changing the distance to the wide-angle side, there was a possibility of uneven irradiation. Of course, it would be possible to always use a flash device with a larger beam angle than the widest angle of view given to the interchangeable lens being attached, but this would
When photographing with a long focal length lens with a narrow angle of view, most of the flash light does not contribute to film exposure and is wasted. On the other hand, as shown in Japanese Patent Application Laid-open No. 57-120922,
Various methods have been proposed in which the light emission angle is varied by simultaneously moving the condensing lens on the front of the flash device in accordance with the focal length setting of the zoom lens, and in which the light emission angle is made variable using other means. ing. However, in general, the focal length of a zoom lens varies greatly, and there are cases where the flash device's variable range of illumination angle cannot completely cover it, especially at the wide-angle end, where the flash illumination angle cannot cover the shooting angle of view. When the camera or shutter release is released before the flash angle changes are slow to follow the focal length change operation, the front of multiple flash devices may not necessarily illuminate a wider area than the shooting angle of view. There was a possibility that the irradiation would be uneven because the irradiation was not always at the corners.

Related conventional technologies include a technology that warns when a photographing lens outside the zoom strobe's beam angle is attached, as disclosed in Japanese Utility Model Application No. 59-87029, and a technology that warns when a photographing lens outside the zoom strobe illumination angle is attached, and a technique that warns when a photographic lens that is outside the zoom strobe illumination angle is attached, and a technology that warns when a photographing lens that is outside the zoom strobe illumination angle is attached, and a technology that warns when a photographing lens that is outside the zoom strobe illumination angle is attached, and a technology that warns when the zoom illumination angle tracking change is completed, as disclosed in Utility Model Laid-open No. Sho 59-87030. Although there are technologies for displaying images, none of them have taken into consideration methods for preventing uneven illumination when multiple flash devices are used.

Fig. 3 is an explanatory diagram showing the uneven illumination that occurs when using multiple conventional flash devices.A is a flash light that has a narrower illumination angle than the required angle of view C at the time of shooting. The irradiation range of the device is shown, and B shows the range of other flash devices that provide irradiation that can cover this angle of view. As shown in the figure, with respect to the photographing angle of view C, the central portion is illuminated by both flash devices, and the peripheral portion is illuminated only by the other flash devices, resulting in uneven illumination.

[Means and effects for solving the problem] According to the present invention, from the angle of view No. 48 indicating the shooting angle information of the photographing lens and the irradiation angle information indicating the irradiation angle information of each of the plurality of flash devices,
The detection circuit detects the magnitude relationship between the shooting angle of view and the flash irradiation angle, and based on this detection result, only the flash devices whose flash irradiation angle is the same as or wider than the ti shadow angle of view are emitted. This automatically prevents uneven irradiation that occurs when emitting light.

〔Example〕

FIG. 1 is a diagram showing the configuration of a photography camera according to an embodiment of the present invention, in which 1 is a camera body, 2 is a zoom lens, 3 is a focal length detector of the zoom lens, and 4 is a focal length detector 3.
A sliding contact piece for focal length detection that slides on the top; 5 is a flash device built into the camera body; 6 is an external flash device body;
7 is a condensing lens, 8 is a light emitting unit, 9 is a holding frame that holds the light emitting unit 8, 10 is a rack mold fixed to the holding frame,
' 11 is a reduction gear, and 12 is a motor.

The built-in flash device 5 is a flash device with a fixed irradiation angle, and has an irradiation angle corresponding to a Ti shadow lens having a focal length of 35 mm, for example. - On the other hand, the focal length of the zoom lens 2 is adjusted when photographing, but this focal length signal is detected by the focal length detector 3, and this signal is sent to the external flash device 6, and the motor 12 responds to the focal length signal. is rotated.

When the motor 12 rotates, the reduction gear 11 is also rotated, and the rotational movement of the motor is converted into linear movement by the rack mold 10 that meshes with the reduction gear 9, and the light emitting part 8 fixed to the holding frame 9 is Move back and forth. As a result, the distance of the light emitting unit 8 to the condensing lens 7 fixed to the external flash device 6 is changed.
The light emission angle will also be changed. That is, the light emission angle of the flash device 6 is changed according to the set focal length of the zoom lens.

Here, the focal length of the zoom lens 2 is set to 24 mm, for example.
It is assumed that the shooting angle of view can be changed within a range of 105 mm to 105 mm. On the other hand, it is assumed that the externally attached flash device 6 can obtain an illumination angle corresponding to a photographic lens of, for example, 28ffII11 to 80+am, and the guide number can be changed accordingly. That is, when the light emitting part 8 of the flash device 6 is brought closer to the condenser lens 7, the light is diffused and an irradiation angle corresponding to a 28 mm wide-angle lens is obtained, but the guide number becomes smaller. Furthermore, when the light emitting section 8 is moved away from the condensing lens 7, the light is condensed and the illumination angle becomes compatible with a telephoto lens (80 mm or more), making it possible to increase the guide number.

Now, set the zoom setting area of the zoom lens to (1) 24
mm or more and less than 28 mm, (2) 28 mm or more and less than 35 mm, (3) 35 mm or more and less than 80 mm, (4) 80 mm
When set to four areas of 105 mm or less, the flash device 5 built into the camera body and the external flash device 6
The effect of this will be explained.

(+) When the focal length of the zoom lens is set to 24 mm or more and less than 28 mm: Even if the external flash device 6 emits light compatible with the widest 28 mm beam angle, the beam angle will be insufficient, and the built-in flash device 5 Naturally, the beam angle is insufficient,
Even when any of the light emitting parts is emitted, the photograph taken will have uneven illumination. In this situation, the flash device 6 in the viewfinder or externally displays a warning message or emits a warning sound to notify the photographer that it is unsuitable for flash photography, and all flash devices also emit light. I won't let you.

(2) When the zoom lens is set to 28 mm or more and less than 351 m: Only the external flash device 6 can be used because the flash non-emission angle allows the most efficient light emission corresponding to this shooting lens, so this can be used and the built-in flash value @5 does not emit light because the irradiation angle is insufficient.

(3) When the zoom lens is set to 35mm or more and less than 80n+m: The external flash device 6 will be able to emit light because the flash irradiation angle will be appropriate and the most efficient light emission will be possible corresponding to the photographic lens, and the built-in flash device will be able to emit light. 5 has the same illumination angle at the 35nun position and can emit light most efficiently. Also 35
Even when the length is less than 80 mm than IIlffl, the irradiation angles do not match, so although the efficiency is poor, irradiation unevenness does not occur, so light is emitted. That is, both 5 and 6 are made to emit light.

(4) When the zoom lens is set to be wider than 80mm and 105mm or less: The external flash device 6 is 80mm.
The irradiation angle is compatible with lenses, and the built-in flash device 5 is 35mm.
This results in a considerable irradiation angle. In this case, although the efficiency is not good, there is no unevenness in light distribution, so both lamps are made to emit light.

FIG. 2 is an electrical circuit diagram showing an embodiment of the light emission control device for the multiple flash device in the configuration shown in FIG. 1. In the figure, CA is the camera body side (built-in flash device circuit part); ES indicates the circuit portion of the external flash device 6.

In the camera body side circuit CA, 2 is a zoom lens, 3
13 is a focal length detector; 4 is a sliding contact piece for focal length detection;
is the power supply for the built-in flash device 5.

14 is a power switch for the built-in flash device 5; 15 is a DC/DC (direct current-direct current) converter for the built-in flash device 5; 1
6 is a light emitting capacitor for the built-in flash device 5, 17 is a trigger circuit for the built-in flash device, 18 is a xenon discharge tube which is the light emitting part of the built-in flash device 5, 19 is a charging completion display circuit for the built-in flash device, and 20 is a camera. This is an X contact that works with the shutter on the main body. 21 is an X contact terminal connected to one end of the above-mentioned X contact for the external flash device 6; 22 is an external signal terminal to which a signal from the flash device 6 is manually input; these terminals are connected to the hot shoe of the camera body. Alternatively, the external one is provided on a connector for connecting a flash device, etc.

24 is an irradiation angle signal generator that outputs a signal of the light emission angle of the camera built-in flash device; 25 is a focal length detector 3;
Detection circuits 26, 27 and 28, 29 that compare the signals from the irradiation angle signal generator 24 with the signals from the irradiation angle signal generator 24 are signal terminals that output signals from the focal length detector 3. 30 is a signal terminal to which a signal from the external flash device 6 is manually input.

31 is a detection circuit consisting of an OR circuit, 32 is a detection circuit consisting of a NAND circuit, and 33 is a warning lamp that indicates that the illumination angle of all the flash devices is not adjusted to the angle of view of the photographic lens.

34 is a detection circuit consisting of an AND circuit, 37 is a detection circuit consisting of an OR circuit, R1 is a grounding resistor, and 40 is a display circuit for displaying in the viewfinder or the like that the flash device 5 is ready to emit light.

Externally, in the circuit ES of the flash device 6, 41 is a power supply battery, 42 is a power source switch, 43 is a DC/DC converter, and 44 is a capacitor for light emission.

45 is a trigger circuit, 46 is a xenon discharge tube as a light emitting section, and 47 is a charging completion display circuit.

48, 49 and 5o are the X contact terminal 21 and signal terminal 22. on the camera body side, respectively. and is connected to the signal terminal 23. 51 is a position detector that detects the position of the movable light emitting unit 8; 52 is a position detection sliding contact piece that slides on the position detector 51;

53 is a detection circuit that compares the signal of the focal length detector 3 of the lens 2 and the signal of the light emitting part position detector 51 of the external flash device; 54, 55, 56; 57, 58, 59 are backflow prevention diodes; 60°61.62.63 is the current limiting resistor,
64゜65, 66, 67 are transistors for controlling the motor 12, 68, 69, 70, 71, 72, 73 are resistors, 1
2 is the motor, 74.75. is a transistor, 76.7
7 is a diode for preventing back electromotive force of the motor 12, 78.7
9 is a resistor, and 80° and 81 are transistors.

82.83 and 84.85 are lens 2 on the camera body side respectively.
The focal length detector 3 is connected to a signal terminal output from the focal length detector 3. Further, 86 is a detection circuit consisting of an OR circuit, and 87 is a detection circuit consisting of an AND circuit.

Next, the operation of FIG. 2 will be explained.

When the power switch 14 on the camera body side is closed and the power source 13 is supplied to the built-in flash device, the focal length signal of the focal length detector 3 of the photographic lens 2 is output to the terminal according to the position of the sliding contact piece 4 for focal length detection. Ao, A, , A2, and the irradiation angle signal of the built-in flash device 5 is sent to terminal B by the irradiation angle generator 24.
o, Bl, and B2.

The detection circuit 25 regards the signal state of each terminal, which is the combination state of the signals of the respective terminals, as one information signal A or B, and raises Ao and Bo to the 0th power, A1 . B, to the first power, A2.
B2 is a square term, and the low level signal (Low) is set to 0.
．． The magnitude relationship between A and B is compared using digital processing that processes the high level signal (l(T) as 2), and the results are output to the respective output terminals 0.j and Q. In other words, each Output terminal 0.P.

According to the comparison result of A and B, if A<B, a signal of Hl is output to the output terminal P, and the irradiation angle is too wide, indicating that part of the flash is wasted, and if A=B, then A HI signal is output to output terminal Q to indicate that the flash irradiation angle is appropriate, and if A>B, an H1 signal is output to output terminal 0 to indicate that the flash irradiation angle is insufficient.

In this embodiment, the built-in flash device 5 is a light emitting unit with a fixed irradiation angle that cannot be changed, and since the value of B is constant, this determination is made only based on the focal length signal A of the zoom lens. Become.

Next, we will discuss the operation of changing the illumination angle of the external flash device.

When the external power switch 2 of the flash device is closed and the power source 41 is supplied to the flash device, the focal length signal of the focal length detector 3 and the position detection signal of the light emitting unit position detector 51 are detected by the respective focal lengths. According to the positions of the sliding contact piece 4 for use and the sliding contact piece 52 for detecting the position of the light emitting part, the terminals 26°2 and 28.29 on the camera body side and the external terminals 82.83 of the flash device
．． 84.85 to the terminals Ao, A, of the detection circuit 53.
It is output to A2 and terminals CG and CI +02.

The detection circuit 53 is the detection circuit 25 on the camera body side described above.
Similarly, the signal at each terminal, which is a combination of the signals at each terminal, is regarded as one information signal A or C, is digitally processed, and the magnitude relationship between A and C is compared.
Output to 0°, P', and Q' respectively. In other words, if A<C, the output terminals 0°, P', and Q' output a H signal to the output terminal P° as a result of comparing A and C. If A=C, H1 is applied to output terminal q°.
A signal is output to indicate that the flash irradiation angle is appropriate, and A>
If it is C, the old signal is output to the output terminal q°, indicating that the flash irradiation angle is insufficient.

Here, it is assumed that the external flash device 6 is equipped with a variable irradiation angle mechanism, unlike the built-in flash device 5, and the above-mentioned 0° and q
The irradiation angle changing operation when the signal "it" is output to "o" will be explained.

First, in the case of A and C (a state in which the irradiation angle of the flash light emitting device is narrow compared to the focal length of the photographic lens) will be explained.

In this case, the H1 signal is output from the output terminal P° of the detection circuit 53. When Po becomes the old output, the transistor 75 is turned on, the motor control transistor 67 is also turned on, and at the same time the transistor 80 is also turned on, so the motor control transistor 64 is also turned on, and the motor control transistors 64 and 67 are connected to the motor 12. A current flows through the motor 12, causing the motor 12 to rotate. When the motor 12 rotates and the light emitting part position detection contact piece 52 moves and the light emitting part position signal becomes C=A, Qo becomes the old output and Po becomes the LO gastric ratio output.

When qo becomes l (I output), the transistor 74 turns on, the motor control transistor 66 also turns on, and the transistor 75 and the motor control transistor 67 continue to be on, and Po becomes a Low output, so the transistor 80 and the motor control transistor 64 are turned off, current no longer flows to the motor 12, and the motor 12 is stopped.
If the movable light emitting section 8 is configured to move together with the light emitting section 8, the movable light emitting section 8 can be moved to a position corresponding to the angle of view of the photographic lens 2, and an appropriate illumination angle can be obtained.

Next, the operation will be explained based on the case where the focal length of the zoom lens 2 is adjusted, the sliding contact piece 4 of the focal length detector 3 is moved, and the condition A>C is established.

In the case of Arc (when the irradiation angle of the external flashlight emitting device 6 is too wide compared to the focal length of the photographic lens), in this case, the output terminal 0° of the detection circuit 53 becomes the old output, and Qo becomes the Low output. , transistor 81, motor control transistor 64, and transistor 74
．． The motor control transistor 66 is turned on, the transistor OFF 5 and the motor control transistor 67 are turned off, and current flows to the motor 10 through the motor control transistor 65 and the motor control transistor 66, so the motor 12 operates as described above. It is rotated in the opposite direction to that in the case of AC and C.

Further, when the light emitting part position detection sliding contact piece 52 is moved and the light emitting part position signal C becomes C=A, Q' is 8! Since 0゛ becomes a low output, the motor 12 is stopped and the movable light emitting section is moved to a predetermined position.

Next, the light emission control function shown in FIG. 2 will be explained.

First, the external device is a flash device, and the signal terminal 49 is connected based on the output of the charging completion display circuit 47 and the output signal of the flash irradiation angle detection circuit 53, when the emission angle is equal to or wider than the angle of view of the shooting lens. (b) When the output of the OR circuit 86 which outputs the II signal and these two outputs are both HI signals, the AND circuit 87 outputs the II signal and provides a signal to convey that light can be emitted. Further, this signal is connected to a transistor 89 via an inverter 88, and the collector line of this transistor is connected to the trigger circuit 45. When this signal is grounded, the trigger circuit 45
Generation of a trigger signal from the xenon discharge tube 46 is prevented.

In other words, generation of the trigger signal when the output of the AND circuit 87 is a low signal is prevented. In almost the same way on the camera body side, the built-in flash device charging completion display circuit 19
and the output of the OR circuit 31 which outputs the old signal when the flash illumination angle is equal to or wider than the angle of view of the photographing lens based on the output signal of the flash illumination angle detection circuit 25. When both outputs are II signals, the AND circuit 34 is provided with an output of the old signal to provide a signal that indicates that light can be emitted. Also, this signal is transmitted to the inverter 9
0 to a transistor 91, the collector line of which is connected to the trigger circuit 17, and when this signal is grounded, generation of the trigger signal from the trigger circuit 17 to the xenon discharge tube 18 is blocked. be done.

On the other hand, the detection circuit 37 is an OR circuit to which the light emission enable signal of the built-in flash device and the input of the signal terminal 22 are applied, and when either input is )II, it outputs the l(I signal). The signal terminal 22 is grounded via a resistor R1, and when nothing is connected to the signal terminal 22, the corresponding human power of the detection circuit 37 is always set to Low.

Here, the resistance value of the grounding resistor R1 is set so as to satisfy the condition R1>R2 with respect to the resistor R2 of the charging completion display circuit 47 of the external flash device.

The output of the detection circuit 37 is given to a display circuit 40, which is activated when the detection output of the detection circuit 37 is ) II, for example, to light a light emitting diode provided in the viewfinder, so that the irradiation angle of the flash device is at least one light. informs the photographer that the camera is ready to emit light with a wider angle of view than the photographic lens.

Next, the operation in such a configuration will be explained.

(a) External: + side X when flash device 6 is not connected
Contact terminal 21. The signal terminal 22 is not connected to anything, and one input terminal T1 of the detection circuit 37 is grounded via a resistor R1 and becomes Low. In this state, when the built-in flash device has completed charging and the irradiation angle is equal to or wider than the angle of view of the 1st darkest lens, the other input terminal T of the detection circuit 37 becomes Hl, and the display circuit 40 is sent, and at this time inverter 90 and transistor 91
The light emission control circuit composed of the inverter 90 and the L
The OW output is applied to the base of the transistor 91, the transistor 91 is turned off, the trigger circuit 17 is enabled to operate, and the xenon discharge tube 18 is enabled to emit light by turning off the X contact 20.

On the other hand, when the built-in flash device 5 is narrower than the irradiation angle, the display device 33 displays the image.

That is, when the light emitting angle of the flash device 5 is narrower than the shooting angle of view, the terminal P of the illumination angle detection circuit 25 becomes the old output,
One input terminal of the detection circuit 32 is pulled up by the pull-up resistor 91 to become )II, the detection circuit 32 outputs the old signal, and the display circuit 33 flashes to give a warning that the light emission angle of the flash device 5 is narrow. .

(b) When external flash device 6 is connected.

(i) For external use, the irradiation angle of the flash device 6 is equal to or wider than the angle of view of the photographic lens.

The output of the detection circuit 86 is HI, and when the external flash device completes charging, the detection circuit becomes HI, and the external flash device is allowed to emit light. In addition, this signal causes the output of the detection circuit 37 to become obsolete, and the display circuit 40 displays in the viewfinder that the built-in flash device is fully charged and that the flash is ready to emit light regardless of whether the illumination angles match.

At this time, the output of the inverter 88 becomes Low, and the output of the inverter 88 becomes Low, and the transistor 89 turns off, and by turning off the X contact 20, The xenon discharge tube 46 of the flash device emits light.

(ii) External flash device 6 is used when the irradiation angle of the flash device 6 is narrower than the angle of view of the photographic lens.

This may occur if the external flash device's variable beam angle function is insufficient to accommodate changes in the angle of view of the photographic lens, or if the setting speed is too slow to keep up, or if the variable beam angle function is set manually. This is caused by forgetting, etc.

At this time, the output of the detection circuit 86 is Low, and regardless of the charging status of the light emitting capacitor 44 in the external flash device, the output of the detection circuit 87 is Low, and the output of the inverter 88 is the old one. , the transistor 89 is on, and even if the X contact 20 is turned off, the external flash device will not operate.

To explain the display state at this time, first, regarding the display device 40 that displays whether or not light emission is possible, charging of the light emission capacitor 16 of the built-in flash device 5 is completed, and the irradiation angle of the built-in flash device is adjusted to the shooting image. Display that photography is possible only when the width is equal to or wider than the corner.

On the other hand, the display section 33 warns that the irradiation angle of any flash device is narrower than the irradiation angle corresponding to the photographic lens, when the irradiation angle of the built-in flash device is narrower than the angle of view of the photographic lens.
Since the light emitting angle of the external or built-in rain light device is insufficient for the photographing angle of view, a display warning is issued with a flashing LED display (or an oscillating sound from a sounding body, etc.).

In this example, the external flash device is shown as one that moves the light emitting part back and forth to change the relative distance to the condensing lens, but the external flash device can be one with a fixed irradiation angle,
It may be one that manually changes the illumination angle (including one that changes the illumination angle using a wide panel, telepanel, etc.),
Any device may be used as long as it can detect illumination angle information in each state. The same applies to the built-in flash device; in this example, a fixed illumination angle type is shown, but a variable illumination angle type is used.
Furthermore, it may be possible to mount a wide panel with a diffusion effect, as long as it can detect this illumination angle information. Furthermore, although this embodiment shows an example in which a single light-emitting unit is used as an external flash device, the same applies when multiple light-emitting units are used or when there is no built-in flash device. Anything that detects the light emission angle and can obtain a wider light emission angle than the photographing angle of view is capable of emitting light.

Furthermore, in this embodiment, two indicators are used as display devices, one to warn of mismatched illumination angles, and the other to indicate that light can be emitted. By changing the color using LEDs, one display device may be used for both purposes.

(Effects of the Invention) As explained above, when taking a photograph using a plurality of flashlight emitting devices, the illumination angle of each flashlight device is detected with respect to the angle of view of the photographing lens, and this light emitting illumination angle is Matches the angle of view,
Alternatively, since only the flash devices with a wider area are allowed to emit light, it is possible to easily take pictures while automatically preventing uneven illumination that occurs when a plurality of flash devices emit light at the same time.

In addition, when an external flash device for multiple flash units is not connected, the voltage at the signal terminal is lowered and a voltage equivalent to the flash enable signal of the external flash device for multiple flash units is applied, allowing operation with only the built-in flash device. In practical terms, there is no need to increase the number of switching operations between adding lights and not adding more lights. Furthermore, by making the display circuits 33 and 40 serve as displays, it is also possible to confirm all information using a single display.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the configuration of a photographic camera according to an embodiment of the present invention, Fig. 2 is an electric circuit diagram showing an embodiment of the present invention, and Fig. 3 is a diagram showing the simultaneous irradiation of multiple conventional flash devices. FIG. 2 is a diagram showing unevenness in irradiation that occurs when 1...Camera body 2...Zoom lens 3...
・Zoom lens focal length detector 4... Sliding contact piece for focal length detection 5... Camera built-in flash device 6... External flash light emitting device body 7... Condensing lens 8... Light emitting part 12...motor Fig. 1

Claims (1)

[Scope of Claims] 1. In a flash photography device having a light emission control means for multi-flash photography in which a plurality of flash devices are connected to a camera, a photographic field angle signal of a photographing lens and an irradiation angle of the plurality of flash devices are represented. a detection circuit that detects the magnitude relationship between the irradiation angle of each flash device and the shooting angle of view based on the respective signals; and a flash device that has an irradiation angle that matches or is wider than the shooting angle of view based on the output of this detection circuit. A flash photography device characterized by emitting only light. 2. The flash photography device according to claim 1, wherein at least one of the plurality of flash devices has a variable illumination angle mechanism. 3. In the flash photographing device according to claim 1, a display device that displays a warning when the irradiation angle of any flash device is less than the photographing angle of view. 4. In the flash device according to claim 1, a display device that displays when at least one light is in a state where it can emit flash light. 5. In the flash device according to claim 1, all the flash devices have an irradiation angle wider than the photographing angle of view, and provide an indication when they are in a state where they can emit light.