JPH07199293A - Increased flash lamps flashing unit - Google Patents

Abstract

PURPOSE:To reduce a malfunction by the input of light expect main flash light by providing a shut off means transiently interrupting the actuation of a photodetector. CONSTITUTION:This increased flash lamps flashing unit is used when a light quantity by the main flash is not enough to photograph and only a photograph dark as a whole is taken, at the time of photographing by a camera with a built-in flash. In the case there are many photographer or the like, when photographing timing is not obtained, the flash light of others is received by the photodetector and erroneous flashing might occur. For taking a counter measure to the erroneous flashing, a circuit for letting the discharge tube 9 of a light emitting part such as a photoelectric conversion circuit 13, a trigger control circuit, a trigger voltage generating/applying circuit, 18 transiently interrupted. Thus, the possibility of the malfunction can be drastically reduced. Moreover, for instance, and opening/closing switch 14 provided on the power supply circuit 15 of the photoelectric conversion circuit 13 is opened to interrupt the supplied power, to stop the actuation of the photodetector.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an additional light emitting device capable of interrupting a light trigger circuit of an electronic flash generator for providing auxiliary illumination separately from a camera. In particular, the present invention relates to an additional light emitting device characterized by an electronic circuit or a mechanical structure that reduces the possibility of malfunctions that occur without synchronizing with the emission of the main flash.

[0002]

2. Description of the Related Art An electronic flash generator (hereinafter abbreviated as "flash") which is detachably attached to a camera or a flash built in the camera is used to emit light at night, indoors and backlights. ing. However, since the amount of emitted light is insufficient due to the small size of equipment equipped with such equipment, in addition to these flashes, a structure separate from the camera and independent, and an inert gas such as xenon together with the electrodes are used. It is composed of a light emitting part made of an enclosed glass tube, a battery for storing discharge energy applied to the glass tube, a power supply for charging the same, and a trigger control circuit for supplying a trigger voltage for starting discharge of the light emitting part. In some cases, the additional flash was used as a supplement.
As the additional flash, there is adopted a synchronous light trigger system in which the light emitted from the normal flash is directly or indirectly detected, detected by a light receiving element, converted into a trigger signal, and the trigger control circuit is operated.

[0003]

However, since the synchronous light emission control of the additional flash by the optical trigger system is configured to emit light when a flash light of a certain level or more is incident, the capacitor is charged and the main flash is charged. In a standby state until the light reception is sensed, there is a malfunction in that the surrounding light other than the main flash emits light even when it enters the light receiving portion. One possible solution to this problem is to use a light guide such as an optical fiber to guide only the main flash light to the light receiving element of the additional flash, but it is expensive and requires a connecting tool between the additional flash and the camera. There were drawbacks such as doing. An object of the present invention is to provide a multiple light emitting device with reduced possibility of malfunction due to light input other than the main flash light.

[0004]

The above objects of the present invention are as follows:
In a light-triggered multiple light-emitting device including a light-emitting unit having a strobe discharge tube for additional flash and a light-receiving unit containing a light-receiving element that senses ambient light, a shut-off means for temporarily interrupting the operation of the light-receiving unit It can be achieved by a configuration including. This can be achieved by a structure in which an opening / closing switch is provided in the light receiving circuit in addition to the main power switch as the shutoff means, and the operation of the optical trigger circuit is arbitrarily interrupted / restored. This can also be achieved by blocking the light-shielding plate so that it can move in and out from the front surface of the light-receiving unit.

[0005]

The additional light-emitting device of the present invention is constructed so that the photographer can arbitrarily interrupt the operation of the light trigger circuit, and the main point is to reduce the possibility of malfunction due to unnecessary light in the surroundings. As a result, the photographer can restore the operation of the optical trigger circuit immediately before photographing and prevent the risk of malfunction light emission due to unnecessary light. Therefore, it is less likely that a shutter chance is lost due to a malfunction.

[0006]

1 is a perspective view of an embodiment of an additional light emitting device of the present invention. FIG. 2 is a circuit diagram of an embodiment of the additional light emitting device of the present invention. FIG. 3 is a circuit diagram of a conventional light-triggered additional light emitting device.

The present invention is described below with reference to an embodiment shown in the drawings. Reference numeral 1 denotes a main body of an additional light emitter including a flash light emitting portion 2 inside, a light receiving portion 3 having a light receiving element 12 for sensing external light, and a slidable shield plate 4 for shielding the light receiving portion 3. is there. The shield plate 4 is operated by the operation button 16. Reference numeral 5 denotes a main capacitor, which forms a power storage circuit together with a battery 6 serving as a power source, a main switch 7, a power supply circuit 8, and a rectifying diode, and a discharge tube 9 of the light emitting unit 2, a trigger transformer 10, and a light emission control element of a trigger signal application circuit. The light receiving element 12 of the light receiving unit 3 and the photoelectric conversion circuit 13 are connected to the trigger circuit composed of the (SCR) 11.
Power supply circuit 1 for supplying power to this photoelectric conversion circuit 13
5, an opening / closing switch 14 is provided. The open / close switch 14 is of any type such as a normal push button type or a slide type, and is attached to the outer surface of the light emitter 1.

The additional light emitting device according to the present invention is used when the main flash has a small amount of light when taking a picture with a camera having a built-in flash, and only dark pictures can be taken. When used in combination with the above-mentioned camera, it is used as an additional light emitting device. However, for example, in the case of a large number of photographers such as in a wedding hall, the light of the flash of another person may be received by the light receiving unit 3 and the light may be erroneously emitted when it is not time to take a photograph. On the other hand, by temporarily interrupting the circuits for making the discharge tube 9 of the light emitting unit 2 emit light, such as the photoelectric conversion circuit 13, the trigger control circuit, and the trigger voltage generation / application circuit, the possibility of malfunction can be significantly reduced. it can. For example, as shown in FIG. 2, the operation of the light receiving unit 3 is stopped by opening the open / close switch 14 provided in the power supply circuit 15 of the photoelectric conversion circuit 13 to cut off the power supply.

Further, a shield plate 4 is provided on the front surface of the light receiving portion 3 as shown in FIG. 1 without providing the opening / closing switch as a disconnecting means for temporarily stopping the operation of the optical trigger circuit. It can be controlled by operating and sliding the operation button 16 to open and close the light receiving unit 3. As another method, the shield plate 4 attached to the light emitter 1 with a connecting cord may be detachably attached to the front surface. Such a shield plate 4 and the opening / closing switch 1
It is also possible to use 4 together.

[0010]

As described above, the additional light emitter according to the present invention can block the flash light other than that of the photographer of the photographer to the light receiving portion, so that it is possible to inexpensively provide the additional light emitter capable of preventing light emission due to malfunction. it can.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of an additional light emitting device of the present invention.

FIG. 2 is a circuit diagram of an embodiment of the additional light emitting device of the present invention.

FIG. 3 is a circuit diagram of a conventional light-triggered additional light emitting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Light emitter 2 ... Light emitting part 3 ... Light receiving part 4 ... Shielding plate 5 ... Capacitor 6 ... Battery 7 ... Main switch 8 ... Power supply circuit 9 ... Discharge tube 10 ... Trigger transformer 11 ... Light emission control element (SCR) 12 ... Light receiving element 13 ... Photoelectric conversion circuit 14 ... Open / close switch 15 ... Power supply circuit 16 ... Operation button

Claims (4)

[Claims] 1. A light-triggered multiplex light-emitting device comprising a light-emitting part having a strobe discharge tube for additional flash and a light-receiving part containing a light-receiving element for sensing ambient light, wherein the operation of the light-receiving part is temporarily performed. An additional light emitting device, which is provided with a shutoff means for interrupting. 2. The additional light emitting device according to claim 1, wherein a switch for arbitrarily interrupting / restoring the operation of the optical trigger circuit is provided as the shutoff means separately from the main power switch. 3. The additional light emitting device according to claim 1, wherein a light blocking plate that can be opened and closed so as to block light incident on the light receiving element for optical trigger is used as the blocking means. 4. The multiplex light-emitting device according to claim 2, wherein the light-shielding plate that can be opened and closed is interlocked with the opening and closing of a switch for arbitrarily interrupting and restoring the operation of the optical trigger circuit.