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:
Mar. 25, 2003
Filed:
Jun. 28, 2002
Shinichi Mihara, Tama, JP;
Yuji Miyauchi, Machida, JP;
Masahito Watanabe, Hachioji, JP;
Hirokazu Konishi, Hachioji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
The object of the invention is to reduce the thickness of electronic image pickup equipment as much as possible, using a zooming mode having stable, high image-formation capabilities from an object at infinity to a near-by object. The electronic image pickup equipment comprises a zoom lens system comprising a negative, first lens group G , a positive, second lens group G and a positive, third lens group G . For zooming from the wide-angle end to the telephoto end of the zoom lens system upon focused on an object at infinity, the separation between G and G becomes wise. By moving G toward the object side of the system, the system can be focused on a nearer-by object. In the zoom lens system, the second lens group G comprises one positive lens , one negative lens and a lens subgroup comprising at least one lens, and the third lens group G comprises one positive lens. The zoom lens system satisfies conditions with respect to the optical axis distance from the image-side surface of the positive lens to the image-side surface of the negative lens and the focal length ratio in air between the positive lens and the lens subgroup