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:
Nov. 19, 2002
Filed:
Sep. 11, 2000
Takanori Yamanashi, Kokubunji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
The invention relates to a compact zoom lens system which can be applied to a relatively large image pickup device and can maintain sufficient image-formation capability even at a wide-angle end of 70° or greater and a zoom ratio of about 10 or greater. The zoom lens system comprises a first lens group G having positive refracting power, a second lens group G having negative refracting power, a third lens group G having positive refracting power, a fourth lens group G having negative refracting power and a fifth lens group G . During zooming from the wide-angle end to the telephoto end of the system, the lens groups G to G are all moving. The first lens group G and the third lens group G move toward the object side in the process of zooming in such a way that-the spacings between the first and second lens groups G and G and the third and fourth lens groups G and G become wide, and at least the fourth lens group G or the fifth lens group G moves nonlinearly, so that fluctuations of an image plane position with zooming can be compensated for. Conditions for defining the power profiles of the first to fifth lens groups G to G are satisfied.