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:
Jun. 14, 1983
Filed:
Jan. 06, 1981
Howard G Lange, Prospect Heights, IL (US);
Ronald Schulman, Northfield, IL (US);
Zenith Radio Corporation, Glenview, IL (US);
Abstract
A single-sheet (i.e. two-surface) rear projection screen for television applications is described, in which the front or viewer-facing surface is formed with vertically running lenticules for horizontal image light distribution and the rear or projector-facing surface is formed with horizontally running lenticules for vertical image light distribution. There is no need for a diffuser. The lenticule profiles on both surfaces vary as a function of distance from the projection axis in a manner calculated to accomplish several optical objectives: collimation, cosine power fall-off compensation, and rearward reflection gradient compensation. Computer programs for calculating the profiles are disclosed.