The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 09, 2000
Filed:
Mar. 25, 1999
Hiroyuki Arai, Omiya, JP;
Tatsuo Saito, Omiya, JP;
Makoto Akiba, Omiya, JP;
Minoru Takahashi, Omiya, JP;
Fuji Photo Optical Co., Ltd., Saitama, JP;
Abstract
A D/A converter performs a D/A conversion on digital light quantity indication data outputted from a CPU to generate an analog light quantity indication signal. The analog light quantity indication signal thus generated is supplied to both a power supply circuit and a light quantity control circuit comprising a photometric sensor, an integration circuit, and a comparison circuit. The light quantity control circuit outputs to a flash light emission circuit a light emission stop signal at the time point when the integrated quantity of light reaches a threshold according to the light quantity indication signal.