Electronic flash apparatus with a protective circuit which limit

Details Electronic flash apparatus with a protective circuit which limit Electronic flash apparatus with a protective circuit which limit

1995-09-27

1997-06-17

Pascal, Robert

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

315240, 315158, 315159, 315119, H05B 3700

Patent

active

056400705

ABSTRACT:
In an electronic flash apparatus having a flash tube (2) which is disposed inside a reflector (3), having a storage capacitor (5) which can be discharged via the flash tube having a d.c. voltage converter (7) which is fed by a d.c. voltage source, preferably a battery (6), and by means of which the storage capacitor (5) can be recharged to its operating voltage following each discharge, and having a control circuit (8) which switches the d.c. voltage converter (7) on or off as a function of the voltage at the storage capacitor (5), overheating of the reflector (3) and/or its front elements (4) is prevented by a protective circuit (12) which influences the flash light emission in such a way that the temperature of the reflector (3) and/or its front elements (4) does not exceed a predetermined maximum value.

REFERENCES:
patent: 4001639 (1977-01-01), Biber
patent: 4091308 (1978-05-01), Schneider
patent: 4228381 (1980-10-01), Hasegawa
patent: 4240008 (1980-12-01), Numata
patent: 4302707 (1981-11-01), Hattori
patent: 4303849 (1981-12-01), Goede et al.
patent: 4951080 (1990-08-01), Sakamoto et al.
patent: 5023470 (1991-06-01), Onozuka et al.

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