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:
Nov. 24, 1981
Filed:
Mar. 10, 1980
Rogers J Greenwald, Rochester, NY (US);
Lawrence J Matteson, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
A focusing device for use with photographic cameras and the like. This invention uses a light source such as an electronic flash to direct light toward an object to be photographed. When the amount of flash light reflected by the subject reaches a predetermined level, a quench circuit is activated which terminates the light emanating from the light source. A timer measures the elapsed time between the depression of the body release and the generation of the quench signal. Converter means translate the measured time interval into a range signal that is functionally related to the distance between the focusing device and the subject. The range signal may then be used to adjust a camera component such as a lens or may be used to control visual indicia that present readings to the operator indicative of range.