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:
Jan. 29, 2002
Filed:
Apr. 28, 2000
Takanori Yamanashi, Kokubunji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
The object of the invention is to reduce the size of a camera by the provision of a zoom lens system which has a high zoom ratio and a small telephoto ratio at the wide-angle and telephoto end, and is simple in lens arrangement and reduced in size during lens collapsing. The zoom lens system comprises a positive first lens group G , a positive second lens group G and a negative third lens group G . For zooming from a wide-angle end to a telephoto end of the system, each lens group moves toward the object side while a spacing between the first lens group and the second lens group becomes wide and a spacing between the second lens group and the third lens group becomes narrow. The first lens group G comprises at least one set of a negative lens and a positive lens. The second lens group G includes an aperture stop and comprises at least one set of a negative lens and a positive lens. The third lens group G comprises one set of a positive lens and a negative lens. Specific conditions for an actual air space between the second and third lens groups G and G , the focal length of the third group G and the zoom ratio shared by the third group G are all satisfied.