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:
May. 22, 1979
Filed:
May. 04, 1977
Soichi Nakamura, Kamakura, JP;
Nippon Kogaku K.K., Tokyo, JP;
Abstract
In a wide angle zoom lens system which comprises a diverging lens group and a converging lens group in order from the object side and in which both of the groups are movable on the optical axis of the lens system to vary the air space between the two groups so that the magnification of the image is variable while the image plane is being maintained at a fixed position, the diverging lens group comprises, in order from the object side, a negative meniscus lens component convex to the object side, a negative meniscus lens component convex to the object side, and a positive meniscus lens component convex to the object side, and the converging lens group comprises at least four positive lens components which are separate from one another, a positive lens component being closest to the object side, a positive lens compartment being closest to the image and a negative lens component disposed among the at least four positive lens components.