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. 27, 1989
Filed:
Feb. 18, 1988
Applicant:
Inventor:
Richard A Buchroeder, Tucson, AZ (US);
Assignee:
TDS Patent Management, Inc., Scarsdale, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
350432 ; 350412 ;
Abstract
A multiple element lens system for projecting images generated from curved surfaces. A spherical projection lens is provided along a projection axis. An aspheric plate follows the spherical lens, which is followed by a second spherical projection lens. Parfocalizing separate curved image surfaces of different primary colors permits a narrow spectral bandwidth lens system, having an improved speed and resolution, providing combined full color projected images.