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. 14, 1984
Filed:
Sep. 10, 1982
Junichi Yazawa, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A small-size telescopic lens system with a brightness of 1:4, an angle of view of .+-.6.degree., and a telescopic ratio of about 0.8, which is constructed of front and back groups of lens elements, is disclosed. The first, second, third, fourth and fifth lens elements are aligned from the object side to the image side. The first, second and third lens elements make up the front group, while the fourth and fifth lens elements make up the back group. The first lens element is a biconvex lens, the second lens element is a biconcave lens, the third lens element is a convex meniscus lens which is convex towards the object, the fourth lens element is a biconcave lens, and the fifth lens element is a biconvex lens.