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:
Feb. 19, 2013
Filed:
Jul. 01, 2009
Takumi Iba, Kyoto, JP;
Masatoshi Yamashita, Osaka, JP;
Takumi Iba, Kyoto, JP;
Masatoshi Yamashita, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The present invention provides an imaging lens composed of three lenses that can be made compact (downsized, thinned), allows a reduction in cost and can be made 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 refractive power whose lens surface facing the image surface side is provided with a diffractive optical element; a second lenscomposed of a meniscus lens having positive refractive power whose lens surface facing the image surface side is convex; a third lenshaving negative refractive power. When f denotes the focal length of the entire optical system, f1 denotes the focal length of the first lens, f2 denotes the focal length of the second lens, f3 denotes the focal length of the third lensand φdenotes refractive power of the diffractive optical element, conditional expressions (1) to (4) are satisfied:0.9<1/<1.3  (1)0.7<2/<1.1  (2)−0.8<3/<−0.6  (3)−0.3<<0.5  (4).