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:
Sep. 23, 1980
Filed:
Jul. 12, 1978
Katsuji Ishikawa, Osaka, JP;
West Electric Co., Ltd., Osaka, JP;
Abstract
In an electronic flash of the type having a main flash capacitor, a trigger circuit, a flash lamp which is ignited by a trigger voltage from the trigger circuit and flashed by the discharge of electrical energy stored in the main flash capacitor, a light reception circuit for integrating the amount of light reflected back from a subject and a flash duration control circuit or a flash interruption circuit actuable when the amount of light integrated by the light reception circuit reaches a predetermined level, a DC power source is connected to the light reception circuit through a switching means which is enabled or closed in response to the flashing of the flash lamp, whereby the erratic operation of the light reception circuit due to the integration of light other than the flash of light reflected from the subject may be avoided.