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. 22, 1981
Filed:
Sep. 22, 1980
Judy Bagdis, Bradford, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
An exposure control circuit for a photographic camera is provided for determining the camera-to-subject range directly by sonic ranging and for automatically responding to the sonically determined subject range to provide either a shortened maximum exposure interval time out period under conditions where the photographic subject is located far enough from the camera as to be just beyond the effective range of the flash or within the effective range of the flash but without sufficient reflectance to effect the termination of exposure solely as a function of scene light integration or an extended maximum exposure interval time out period under conditions where the photographic subject is located far enough from the camera as to be far beyond the effective range of the flash where there is likely to be little or no reflected flash light.