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:
Feb. 20, 1990
Filed:
Apr. 07, 1988
Eugene D Yeo, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Imaging apparatus includes a light transparent platen for holding an original document which may be smaller than the platen. A light source illuminates the platen to expose a document on the platen. Transmittance of light through that portion of the platen not covered by a document is selectively inhibited, preferably by becoming substantially opaque. A light-blocking platen cover is movable between an operative, light blocking position and a non-use position. The light inhibiting operation is actuated when the cover is moved to its non-use position. Document recognition is used for detecting the outline of the original document on the exposure platen to control actuation of the light inhibiting operation, which is preferably effected by a liquid crystalline cell which has a pair of opposed plates, a grid of transparent electrodes interposed between the pair of plates, and a layer of crystalline material interposed between the pair of plates contacting the grid. Document recognition controls energization of the electrodes.