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. 11, 2003
Filed:
Apr. 10, 2001
Minoru Toyama, Osaka, JP;
Nippon Sheet Glass Co., Ltd., Osaka, JP;
Abstract
An imaging optical element is comprised of a gradient index rod lens of which external peripheral surface is a smooth surface without being processed by means of a flare-cut treatment and a field limitation stop member mounted on the lens surface at the incidence side thereof. As for the stop member, the length t thereof is: t>1 ·D/2X (where, 1 : a lens working distance, D: a rod lens diameter, X: a radius of field of view), whereby the angle of incidence of beam &thgr; at the center of the lens satisfies &thgr;<tan (X/1 ) . It is effective especially when an application thereof is made to a rod lens array comprised of a plurality of rod lenses arranged into an array.