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:
Nov. 04, 2003
Filed:
Mar. 31, 1997
Hiromi Sasako, Tokyo, JP;
Kayoko Masaki, Kawaguchi, JP;
Other;
Abstract
An improved surface light source device applicable to back lighting of a liquid display. In the surface light source device, a plate-shaped optical block ( ) is disposed along an emitting surface of a plate-shaped optical member ( ), to which illumination light is to be supplied from a primary light source ( ), and has on at least one of its outer and inner sides a directivity modifying surface for modifying directivity of illumination light emitted from the emitting surface. Directivity modifying surface occupies at least part of the whole area of the optical block except a predetermined range (AR ) from a position aligning to the incidence surface of the plate-shaped optical member ( ). The optical block ( ) and the plate-shaped optical member ( ) may be held in a unitary form by a holding mechanism formed integrally with the optical block ( ) and/or the plate-shaped optical member ( ). One end of a reflection member about the primary light source ( ) may be pinched between the optical block ( ) and the plate-shaped optical member ( ).