Apparatus for controlling the charging of a main capacitor of a

Details Apparatus for controlling the charging of a main capacitor of a Apparatus for controlling the charging of a main capacitor of a

1987-12-23

1990-05-08

Boudreau, Leo H.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

315241S, 315209F, 315DIG5, 315DIG4, 315241R, 315307, 3541271, 35412711, H05B 3700

Patent

active

049241494

ABSTRACT:
A=n apparatus is provided for controlling the charging of a main capacitor of a flash unit. Comparison means detect the timing at which a voltage V across the main capacitor reaches a reference voltage V.sub.1, at which point a flash photograph can be taken. A timer detects whether a predetermined time period has elapsed since the voltage V across the main capacitor reached the reference voltage V.sub.1 so as to stop charging the main capacitor. When the voltage V across the main capacitor drops to the reference voltage V.sub.1, as a result of the phenomenon known as "spontaneous discharge", recharging of the main capacitor occurs and the above process is repeated. When the recharging of the main capacitor has been performed over a predetermined time period or a predetermined number of times, the charging of the main capacitor is stopped. A second embodiment is disclosed wherein flash photography can occur if a predetermined value is greater than the time period that has elapsed until a shutter on a camera associated with the flash unit is operated after the voltage V across the main capacitor has reached a reference voltage V.sub.2 (which is greater than V.sub.1). If the time period is less than the predetermined value, the operation of the flash unit is inhibited so as to restart the charging of the main capacitor.

REFERENCES:
patent: 3777212 (1973-12-01), Mashino
patent: 3780344 (1973-12-01), Paget
patent: 4005337 (1977-01-01), Rabe
patent: 4013921 (1977-03-01), Corthell
patent: 4384776 (1983-05-01), Takami
patent: 4422016 (1983-12-01), Kurple
patent: 4540265 (1985-09-01), Harvey
patent: 4623824 (1986-11-01), Scolari et al.
patent: 4628229 (1986-12-01), Inoue

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