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:
Jul. 23, 1985
Filed:
Feb. 03, 1983
Kazuo Yamakawa, Sakai, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
A video projector lens system is provided, which comprises first positive lens, second positive lens, third negative lens, fourth positive lens and fifth negative lens. The third negative lens is made of plastic and located for correcting chromatic aberration, while the first or second positive lens is made of plastic for cancelling the temperature depending characteristic of the second negative plastic lens with its counterbalanced positive refractive power, wherein at least one aspheric surface is made on the plastic lens. The fourth positive lens bearing a considerable part of the positive refractive power distributed in the whole lens system is made of glass for avoiding further temperature dependency.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile