Flash device

Details Flash device Flash device

1998-04-30

2000-05-09

Adams, Russell

Photography

With object illumination for exposure

With power supply detail

396206, G03B 726

Patent

active

060615281

ABSTRACT:
In a flash device of the kind preventing a main capacitor from being overcharged by inhibiting a charging action on the main capacitor when the voltage of the main capacitor reaches a predetermined first level, detecting the voltage of the main capacitor by a voltage reference diode and allowing light emission when the voltage of the main capacitor reaches a second level which is higher than the first level, an element having a negative temperature characteristic is connected in series to the voltage reference diode. The arrangement ensures an apposite operation of the flash device irrespective of temperature variations.

REFERENCES:
patent: 3688659 (1972-09-01), Takishima et al.
patent: 4068150 (1978-01-01), Iwata et al.
patent: 4074170 (1978-02-01), Orban
patent: 4258297 (1981-03-01), Nakajima
patent: 5587644 (1996-12-01), Masaki
patent: 5678077 (1997-10-01), Ichikawa et al.
patent: 5713055 (1998-01-01), Lawther et al.

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