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:
Dec. 29, 2009
Filed:
Apr. 24, 2008
Junichi Nio, Chiba, JP;
Junichi Nio, Chiba, JP;
Seiko Precision Inc., Chiba, JP;
Abstract
An imaging lens has a compact shape and sufficiently compensates for various aberrations. The imaging lens includes a first lens, a second lens, and a third lens disposed sequentially, with the first lens toward an object. The conditions '0.5H<T0<0.7H,' '2<φr4/φ<2.5,' and “0.15<φr5/φ<0.3” are satisfied, where: H is the effective radius of the surface of the third lens facing an image surface; T0 is the distance between the optical axis and a point on a line parallel to the optical axis and normal to the surface of the third lens facing the image surface; φ is the combined refractive power of the imaging lens; φr4 is the refractive power of the surface of the second lens facing the image surface; and φr5 is the refractive power of the surface of the third lens facing the object.