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:
Apr. 10, 1984
Filed:
Dec. 14, 1982
Yuji Maruyama, Osaka, JP;
Katsumi Horinishi, Osaka, JP;
West Electric Co., Ltd., Osaka, JP;
Abstract
An electronic flash device capable of automatically controlling the quantity of a flash of light or a flash duration in response to the intensity of light reflected from a subject, is provided with a means which is responsive to an electrical signal, which is derived from a camera or an arithmetic circuit incorporated in the electronic flash device and represents one of a plurality of f numbers which is selected, so as to control a flash light control means which in turn, for instance, determines a flash duration of a flash lamp and hence the quantity of a flash of light emitted therefrom. Therefore, the quantity of a flash of light can be controlled in steps equal in number to f numbers which can be selected.