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:
Aug. 02, 1988
Filed:
May. 20, 1987
Takayuki Yoshioka, Tokyo, JP;
Shinichi Hasegawa, Tokyo, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A projection lens system is disclosed which comprises in order from a screen side, a first lens unit having a positive focal length, a second lens unit having a negative focal length, a third lens unit having a positive focal length, a fourth lens unit having a positive focal length and a fifth lens unit having a negative focal length and a concave surface directed toward the screen side. The first and second lens units being made of plastic. At least one of lens surfaces of the first and second lens unit is aspherical. At least one of lens surfaces of the third and fourth lens units is aspherical. The fifth lens unit is made of plastic and at least one of lens surfaces of the fifth lens unit is aspherical.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile