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:
Aug. 25, 1981
Filed:
Nov. 13, 1979
Joseph M Canter, Lexington, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
A photometric device for determining the exposure interval for a scene to be photographed includes a photometric array having a plurality of individual photocells that are each adapted to receive light reflected from a selected portion of the scene. Each photocell provides a signal output that is proportional to the light from the scene incident upon the cell. The outputs are each time integrated from the initiation of the exposure interval with the integrated results compared to a predetermined value representative of the desired exposure parameters for the film. A logic array terminates the exposure interval when a majority or median number of the time-integrated results indicate that the film exposure parameters for the respective portions of the scene have been met. The exposure interval is advantageously determined as a function of the median value of the light reflected from the scene rather than the average value and the exposure interval is thereby less affected by extreme variations in brightness.