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:
Jun. 05, 2012
Filed:
Jul. 10, 2009
Takumi Iba, Kyoto, JP;
Masatoshi Yamashita, Osaka, JP;
Nami Nagamori, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The present invention provides an imaging lens composed of four lenses that can be made compact (downsized, thinned), allows a reduction in cost and is compatible with a high pixel imaging element having a megapixel or more incorporated in a small mobile product such as a mobile phone. The imaging lensincludes, in order from the object side to the image surface side: an aperture stop; a first lenshaving positive power; a second lenscomposed of a meniscus lens having negative power whose lens surface facing the image surface side is concave; a third lenscomposed of a meniscus lens having positive power whose lens surface facing the image surface side is convex, and a fourth lenshaving negative power whose lens surfaces are both aspheric and lens surface facing the image surface side is concave in the vicinity of the optical axis. A diffractive optical element is formed on one of the lens surfaces of the first lensor one of the lens surfaces of the second lens