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:
Mar. 07, 2006
Filed:
Jun. 27, 2003
Satoshi DO, Saitama, JP;
Satoshi Do, Saitama, JP;
Milestone Co., Ltd., Tokyo, JP;
Abstract
A pickup lens is provided in which various aberrations are satisfactorily corrected, which can be manufactured at low cost, and which has an optical length of 10 mm or less. This pickup lens is configured by arranging, in order from the object side, a first lens Lwith a meniscus shape with concave surface on the object side and having negative refractive power, an aperture diaphragm S, a second lens Lwith convex surfaces on both sides and having positive refractive power, a third lens Lwith concave surfaces on both sides and having negative refractive power, and a fourth lens Lwith convex surfaces on both sides and having positive refractive power; and with the following conditions satisfied.+5.0<()/()<+7.0  (1)0.15f<d<0.3f  (2) Here ris the radius of curvature of the object-side surface of the first lens in the vicinity of the optical axis (axial radius of curvature), ris the radius of curvature of the image-side surface of the first lens in the vicinity of the optical axis (axial radius of curvature), dis the thickness of the first lens, and f is the focal length of the entire system.