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. 23, 1995
Filed:
Dec. 22, 1992
Akira Ishisaka, Hino, JP;
Konica Corporation, Tokyo, JP;
Abstract
A compact zoom lens constituted of, from an object side, a first lens group having a positive refractive power and a second lens group having a negative refractive power, in which image magnification is varied by adjusting the distance between the two lens groups. The first lens group is composed of a front lens component having a negative refractive power including at least one aspherical surface and a rear lens component having a positive refractive power. The front lens component is composed of the first negative lens and the second meniscus lens. The convex surface of the meniscus lens is directed to the image side. The following inequality is satisfied: .upsilon.n<35 where .upsilon.n is the Abbe's number of the lens which has a stronger negative refractive power of the two lenses in the front component of the first lens group.