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:
Oct. 24, 1989
Filed:
Dec. 04, 1986
Kazuo Yamakawa, Osaka, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
The present invention provides a video projector lens system for projecting onto a screen a video image formed on a face plate of a cathode ray tube, with having high optical performance, large aperture, or matching for applying optical coupling technique. The lens system comprises, from the screen side to the tube side; a first positive lens having a screen side convex surface; a second negative meniscus lens having a screen side convex surface; a third bi-convex lens made of a glass material; and a fourth negative lens having a screen side concave surface. The lens system includes at least one aspheric surface and fulfills the following condition;
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile