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:
Sep. 21, 2010
Filed:
Feb. 19, 2008
Takumi Iba, Kyoto, JP;
Nami Nagamori, Osaka, JP;
Takumi Iba, Kyoto, JP;
Nami Nagamori, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A photography lensincludes: an aperture stop; a first lenshaving positive refractive power, and at least one of the lens surfaces is aspherical; a second lenshaving negative refractive power, and at least one of the lens surfaces is aspherical; and a third lenshaving positive refractive power, and both lens surfaces are aspherical, arranged in that order from an object side to an image surface side. When f indicates the focal length of the entire optical system, f1 indicates the focal length of the first lens, f2 indicates the focal length of the second lens, r21 indicates the radius of curvature of the lens surface of the second lensfacing the object side, and n2 indicates the refractive index of the second lens, the following conditional expressions (1) to (3) are satisfied:0.8<1/<0.9  (1)−1.0<2/<0.7  (2)−1.0<21/((2−1)·)<−0.7.  (3)Thus, it is possible to provide a bright photography lens having high performance and an F number of 3.5 or less. The photography lens can be small and thin, and it can be manufactured at low cost, and it is compatible with a high pixel imaging element of a megapixel or more incorporated in a small mobile product such as a mobile phone.