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:
Mar. 25, 1980
Filed:
Oct. 23, 1978
Lawrence J Matteson, Rochester, NY (US);
David J Shonts, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
A quenchable electronic flash for use with a camera having an M-contact flash synchronization device, includes a flashtube for producing light, a light-responsive integrating circuit for producing a flash terminating signal when the quantity of light measured by the integrating circuit reaches a predetermined level representative of a desired film exposure, and a quench circuit responsive to the flash terminating signal for terminating the production of further light by the flashtube. A time control circuit, responsive to actuation of the flash synchronization device, energizes the integrating circuit substantially with initial opening movement of a shutter of the camera. As a result, the integrating circuit is prevented from responding to any light prior to initiation of an exposure interval and responds to a quantity of light that corresponds substantially to the light, e.g. ambient as well as flash, impinging on film in the camera during an exposure.