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:
Apr. 14, 2009
Filed:
Jun. 05, 2008
Hiromitsu Yamakawa, Saitama, JP;
Ryoko Otomo, Saitama, JP;
Hiromitsu Yamakawa, Saitama, JP;
Ryoko Otomo, Saitama, JP;
Fujinon Corporation, Saitama, JP;
Abstract
An ultra wide-angle imaging lens deviceincludes, in order from an object side: a negative first lens Lhaving a meniscus shape with a convex surface directed to the object side; a negative second lens Lhaving a concave surface directed to an image side and having at least one aspheric surface; a positive third lens Lhaving a convex surface directed to the object side and having at least one aspheric surface; a stop; and a positive fourth lens Lhaving a convex surface directed to the image side and having at least one aspheric surface. The following conditional expression (1) is satisfied:−3.2<<3.2  (1)where L denotes a distance on an optical axis from an object side surface of the first lens to an image formation surface, and fdenotes a composite focal length of the third and fourth lenses Land L