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. 24, 2004
Filed:
Mar. 31, 2003
Yasutaka Kashiki, Hino, JP;
Olympus Corporation, Tokyo, JP;
Abstract
A three-unit zoom lens includes, in order from the object side, the first lens unit with positive refracting power, the second lens unit with positive refracting power, and the third lens unit with negative refracting power. When the magnification of the zoom lens is changed, extending from the wide-angle position to the telephoto position, individual lens units of the three-unit zoom lens are moved toward the object side so that a space between the first lens unit and the second lens unit, after being increased as the lens units are moved from the wide-angle position toward the proximity of the middle position, is decreased as they are moved toward the telephoto position, and a space between the second lens unit and the third lens unit is also decreased accordingly. In this case, the three-unit zoom lens has a variable magnification ratio of 2 or higher and the first lens unit is constructed with a single lens element.