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:
Sep. 27, 1983
Filed:
Jan. 13, 1982
Sigetada Sato, Tokyo, JP;
Sadao Okudaira, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A high performance compact wide angle zoom lens, composed, in order from the object side, of a divergent front lens group and a convergent rear lens group, wherein the front and rear lens groups are moved mechanically to thereby vary the overall focal length. The front lens group being composed, in order from the object side, of a first lens including a negative meniscus lens convex to the object, a second lens including a positive biconvex lens, a third lens including a negative meniscus lens convex to the object, a fourth lens including a negative lens and a fifth lens including a positive lens. The rear lens group being composed of a sixth lens including a positive lens, a seventh lens including a positive meniscus lens convex to the object, an eighth lens including a biconvex positive lens, a ninth lens including a biconcave negative lens, a tenth lens including a positive lens and an eleventh lens including a positive lens. The ninth lens being cemented to said eighth lens so that the wide angle zoom lens as a whole includes eleven lens elements grouped into ten lens components.