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:
Oct. 15, 2002
Filed:
Sep. 06, 2000
Tomohiro Saito, Kawaguchi, JP;
Isamu Kaneko, Kawaguchi, JP;
Enplas Corporation, Saitama, JP;
Abstract
An image pickup lens system according to the present invention includes a diaphragm, a first lens which has a convex fact formed on the side of an image surface in the vicinity of an optical axis and which has a positive power and radii of curvature at a center, whose signs are not opposite from each other, a second lens which has a convex face formed on the side of an object in the vicinity of the optical axis and which has a negative power and radii of curvature at a center, whose signs are not opposite from each other, and a third lens which has a convex face formed on the side of the image surface in the vicinity of the optical axis and which has a positive power. The diaphragm and the first, second and third lenses are disposed sequentially from the side of the object, and the first face of at least the second lens being formed into an aspherical shape. Thus, each of various aberrations can be corrected satisfactorily, while maintaining a desired optical performance and ensuring a wider angle of view, and the image pickup lens system can be produced easily.