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:
Jul. 03, 2012
Filed:
Jul. 28, 2010
Kenzo Sado, Saitama, JP;
Kenzo Sado, Saitama, JP;
Fujifilm Corporation, Tokyo, JP;
Abstract
A wide-angle projection zoom lens includes: a first negative lens group for focus adjustment that is fixed when power varies; a second positive lens group, a third negative lens group, and a fourth positive lens group that are moved when power varies; and a fifth positive lens group that is fixed when power varies. The first to fifth lens groups are arranged in this order from a magnification side. The first lens group includes a first negative lens, which is an aspheric lens made of plastic, a second negative lens, a third negative lens, and a fourth positive lens which are arranged in this order from the magnification side. The wide-angle projection zoom lens is configured so as to satisfy four predetermined conditional expressions.