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. 21, 2020
Filed:
Jan. 11, 2017
Enplas Corporation, Saitama, JP;
Kensuke Hiraka, Saitama, JP;
Enpias Corporation, Saitama, JP;
Abstract
This planar light source device comprises a base board, a light-emitting device and a diffusing plate. The light-emitting device includes a light-emitting element and a light flux control member. The light flux control member has an entry surface, an exit surface, and a gate mark. The entry surface and the exit surface are formed in such a manner that the illuminance distribution on the diffusing plate has an anisotropy wherein the light reaches farther in the directions of 1 or more predetermined horizontal angles φ than in other directions, when assuming that the light is emitted from the light-emitting device in a state wherein the light flux control member does not have the gate mark. The horizontal angle φ range of the gate mark includes any one among the 1 or more predetermined horizontal angles φ.