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:
Jun. 01, 1999
Filed:
May. 23, 1997
Osamu Kuno, Kanagawa, JP;
Nobuchika Momochi, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A doublet lens which, on being inserted between the light rays, can perform deviation correction in an afocal state without its focal length being changed. The doublet lens is arranged so that, if the radius of curvature of the concave surface of a plano-concave lens 10X is r1, the refractive index of the plano-concave lens 10X is n1, the magnitude of a gap between the plano-concave lens and the plano-convex lens is .DELTA., the refractive index of the gap is n2, the radius of curvature of the convex surface of a plano-convex lens 10Y is r2 and the refractive index of the plano-convex lens 10Y is n3, the following relation: ##EQU1## is met. The angle between opposite planar surfaces is changed by rotating the plano-convex mirror, for example, of the doublet lens about its center of curvature as the center of rotation.