Flash lighting circuit

Details Flash lighting circuit Flash lighting circuit

1992-08-20

1993-11-23

Perkey, W. B.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

3541451, 315240, 315241P, G03B 1505, H05B 4126

Patent

active

052648958

ABSTRACT:
To provide a small-sized and inexpensive flash lighting circuit for a camera capable of fully reducing red eyes reflection, a sub capacitor, a main capacitor and a flash discharge tube are connected in parallel to a DC-DC converter, whereby the sub capacitor is directly connected to the DC-DC converter, the main capacitor is connected to the above parallel connected line through a first diode which prevents the charge of the main capacitor from flowing into the flash discharge tube to allow preliminary lighting, the thyristor for changing over preliminary lighting and main lighting is disposed between the main capacitor and the flash discharge tube on a bypass line led out from the junction point of the main capacitor and the first diode, and a second diode, which prevents the charge of the main capacitor flowing into the sub capacitor after the sub capacitor has been first discharged at the time of main lighting, is disposed on the above parallel connected line between the cathode of the thyristor and the sub capacitor.

REFERENCES:
patent: 3748989 (1973-07-01), Ban
patent: 3758817 (1973-09-01), Elliot
patent: 4255046 (1981-03-01), Corona
patent: 4467248 (1984-08-01), Watanabe
patent: 4881013 (1989-11-01), Kataoka et al.
patent: 4908552 (1990-03-01), Kumakura

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