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:
Dec. 18, 2001
Filed:
Dec. 23, 1999
Atsujiro Ishii, Hachioji, JP;
Yuji Miyauchi, Hachioji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A compact yet low-cost zoom lens system being particularly suited for use with small portable information terminal equipment is provided. The zoom lens system includes, in order from an object side thereof, first, third and fourth lens groups G,G,and G,respectively, that have positive refracting powers and a second lens group G,that has negative refracting power. Lens group G,remains fixed during zooming and lens groups G,and G,move during zooming and lens group G,is movable during zooming. the zoom lens system should satisfy condition (1) regarding the power of lens group G,condition (2) regarding the amount of movement of lens group G,during zooming condition (3) regarding the composite power of lens groups G,and G,and condition (10) regarding the actual value of the back focus.