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:
Dec. 08, 1992
Filed:
Feb. 06, 1991
Arno G Ledebuhr, Pleasanton, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
A projection apparatus 30 with internal image registration is disclosed herein. The projection apparatus 30 of the present invention includes a light valve arrangement 58, 60, 62 for providing an image beam and an alignment beam, with the alignment beam having a predetermined spatial relationship with the image beam. The image beam is projected onto an external screen 20 by a projection lens 46. The present invention further includes a photodetector assembly 46, 48, 50 for generating a control signal in response to the position of the alignment beam. The image beam is aligned with the projection lens 46 by a light valve control circuit responsive to the control signal.