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:
Apr. 09, 1985
Filed:
Jan. 31, 1983
Nippon Sheet Glass Co., Ltd., Osaka, JP;
Abstract
A plate lens comprising a transparent base having two flat surfaces and having a plano-convex lens portion which is formed integrally with the transparent base, which has a refractive index greater than that of the transparent base and which has a substantially semicircular or circular section in a direction perpendicular to the flat surfaces of the transparent base. The plate lens has a light-shielding layer on one surface of the transparent base, as needed. The light-shielding layer covers one surface of the transparent base such that a transparent portion may be formed in the vicinity of a position opposing the central point or line of the plano-convex lens portion. The plate lens provides a clear and bright image and is therefore applicable to faceplates for various types of display devices, CRTs and the like. The plate lens may be mass-produced at low cost.