Wireless flash photographing system in which light emission cont

Details Wireless flash photographing system in which light emission cont Wireless flash photographing system in which light emission cont

1995-07-21

1997-06-17

Metjahic, Safet

Photography

With object illumination for exposure

Having exposure synchronizer

396182, 396189, G03B 700, G03B 1505

Patent

active

056406231

ABSTRACT:
A wireless flash photographing system prohibits flash light reception for a predetermined time period when it is determined that received flash light is not an identification signal. Light emission for pre-confirming a shade and main light emission are switched by the identification signal. A flash device applied to this system comprises a power supply circuit section, a light emission section, a control section and a light receiving circuit section. The light emission section comprises a series circuit including a main capacitor, a discharge tube, a diode and an IGBT, a voltage doubler circuit including resistors and a capacitor, and a trigger circuit including a trigger transformer and a trigger capacitor. The light emission section controls the IGBT to start/stop light emission. A CPU of the control section is connected to a terminal X for transmitting a light emission start signal from a camera, a terminal TTL for transmitting a light emission stop signal from the camera, and a GND terminal, as well as to various switches. The CPU receives an identification signal for identifying modeling light emission and main light emission.

REFERENCES:
patent: 4368966 (1983-01-01), Hagyuda
patent: 4582410 (1986-04-01), Niwaya et al.
patent: 4884094 (1989-11-01), Kitaura et al.
patent: 5283610 (1994-02-01), Sasaki
patent: 5384611 (1995-01-01), Tsuji et al.
patent: 5446512 (1995-08-01), Mogamiya

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