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. 02, 1986
Filed:
Dec. 14, 1984
Taketoshi Fujikawa, Aichi, JP;
Kazuhiro Kozuka, Aichi, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi, JP;
Abstract
An aspherical lens for use in optical equipment is made of a transparent lens material and rotationally symmetrical around a Z-axis of an XYZ three-dimensional coordinate system. The aspherical lens has a surface on which incident light falls and another surface from which light emerges. Either one of the surfaces comprises a spherical surface and the other surfaces comprises an aspherical surface to allow a lens to singly diverge and converge parallel rays of light. The coordinates in three-dimensional coordinate system of points on the spherical and aspherical surfaces are given using as parameters an angle (-90.degree..ltoreq..theta..ltoreq.90.degree.) formed in a plane containing the Z-axis and normal to an X-Y plane and between the Z-axis and a line connecting the point and the origin of the coordinate system, and an angle (0.degree..ltoreq..phi..ltoreq.180.degree.) formed in a plane parallel to the X-Y plane and between an X-axis and a line connecting the point and the Z-axis.