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:
Feb. 19, 1980
Filed:
May. 27, 1977
Yutaka Iizuka, Tokyo, JP;
Nippon Kogaku K.K., Tokyo, JP;
Abstract
A zoom lens system comprises, in order from the object side, a positive first lens group, a negative second lens group, a positive third lens group, a negative fourth lens group and a positive fifth lens group. The first lens group includes a positive lens component comprising a negative and a positive lens cemented together, and a positive meniscus lens component convex to the object side. The second lens group includes a negative lens component and a negative lens component comprising a negative lens and at least one positive lens cemented together. The third lens group includes at least one positive lens component and a positive lens component comprising a positive and a negative lens cemented together. The fourth lens group includes a negative lens component. The fifth lens group comprises a forward and a rearward group spaced apart a substantial distance from each other by an air space. The forward group includes a positive meniscus lens component convex to the object side, and the rearward group includes a negative meniscus lens component convex to the image side and a positive lens component.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile