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:
Jul. 14, 1992
Filed:
May. 18, 1990
Fumiaki Akahane, Suwa, JP;
Seiko Epson Corporation, , JP;
Abstract
A background lighting apparatus comprises a light source arranged adjacent to a light entering end face or surface of a transparent plate and having an irregular reflecting surface or portion on at least one side thereof and wherein the irregular reflecting surface or portion comprises a plurality of milky white type fine lines. The width of the fine lines of uniform pitch monotonically increases across the transparent plate from the light source or the pitch between fine lines of uniform width monotonically decreases across the transparent plate from the light source or the width of the fine lines and the pitch between the lines monotonically increase and monotonically decrease, respectively, across the transparent plate in a direction from the light source.