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:
Apr. 17, 1990
Filed:
Dec. 05, 1988
George D Whiteside, Lexington, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
A selected one of two or more variable density color filters is automatically positioned in the optical axis of a taking lens of a photographic camera, if necessary, prior to an exposure in order to automatically effect a color balanced exposure of a photosensitive material located within the camera. The color balance of a photographic image formed in a photosensitive material is dependent upon several factors. These factors include the color balance of the photosensitive material, the color temperature of scene illumination and the temperature of the photosensitive material processing fluid. In the present arrangement, the position of the variable density filter in the optical path of the taking lens is concurrently dependent upon one or more of these factors which, under certain conditions, may collectively offset one another such that movement of a variable density color filter for photographic image color balancing purposes does not occur.