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. 11, 1980
Filed:
Nov. 13, 1978
Arthur G LaRocque, Belmont, MA (US);
George D Whiteside, Lexington, MA (US);
Bruce K Johnson, Andover, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
A photographic camera control system is provided for varying the time at which a source of artificial illumination is energized subsequent to the commencement of a photographic exposure interval in accordance with variations in the ambient scene light intensity and the camera-to-subject range. The control system operates to energize the source of artificial illumination at later times and hence larger aperture values under conditions of insignificant ambient scene light intensity than under conditions of substantially higher ambient scene light intensity for identical camera-to-subject distances. The control system additionally operates to control the energization of the source of artificial illumination during a photographic exposure interval occurring under conditions of substantially high ambient scene light intensity so that a select portion of the optimum film exposure value may be directly attributable to the ambient scene light while the remaining portion of the optimum exposure value is directly attributable to the artificial scene light provided by the source of artificial illumination.