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. 13, 1988
Filed:
Sep. 18, 1985
Kiyoshi Hayashi, Yokohama, JP;
Yutaka Iizuka, Fujisawa, JP;
Nippon Kogaku K. K., Tokyo, JP;
Abstract
A zoom lens comprises, in the order from the object side, a first diverging group of lenses and a second convergent group of lenses. The first and second groups of lenses are movable along the optical axis to effect zooming. The first group comprises, in the order from the object side, a negative meniscus lens having its convex surface faced to the object side, a negative lens and a positive lens having its surface of larger curvature faced to the object side. The second group of lenses comprises, in the order from the object side, a positive lens, a positive lens formed by a single lens or a combination of cemented positive and negative lenses and functioning as an achromatic lens, a negative lens having its surface of larger curvature faced to the image side and a positive lens. The zoom lens satisfies certain conditions.