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:
Aug. 13, 1996
Filed:
Dec. 30, 1994
Hiroshi Sato, Hachioji, JP;
Konica Corporation, Tokyo, JP;
Abstract
A zoom lens includes, in the order named from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, which is movable along an optical axis of the zoom lens in accordance with a magnification change, a fixed third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, which is movable along the optical axis, to compensate for a positional change of an image plane according to the magnification change. The fourth lens group includes at least two positive lenses and at least one negative lens. At least two lenses constituting the fourth lens group are made from plastic lenses which are cemented together.