Charge control device in a flash device for a camera

Details Charge control device in a flash device for a camera Charge control device in a flash device for a camera

1983-09-16

1985-04-16

Adams, Russell E.

3541451, G03B 716

Patent

active

045112339

ABSTRACT:
A flash device for photography includes a DC/DC converter for boosting a DC power source voltage and applying a voltage to a main capacitor for supplying an energy for driving a flashlight tube. The converter has control means operative in response to the trigger operation by a start operating switch to detect any reduction in the charging current of the main capacitor and stop said operation. The flash device is provided with another switch means for enabling the operation of the converter independently of the start operating switch. Said another switch means is operative to operate the converter until the charging voltage of the main capacitor reaches a sufficient value to drive the flashlight tube.

REFERENCES:
patent: 4001640 (1977-01-01), Biber
patent: 4023068 (1977-05-01), Harvey
patent: 4096492 (1978-06-01), Land et al.
patent: 4130780 (1978-12-01), Ban et al.
patent: 4199242 (1980-04-01), Hosomizu et al.
patent: 4295719 (1981-10-01), Lange
patent: 4322143 (1982-03-01), Mailander
patent: 4348087 (1982-09-01), Ellin et al.
patent: 4361389 (1982-11-01), Monks et al.
patent: 4367025 (1983-01-01), Metzger

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