• Patent Title: Light-emitting device, planar light source device and display device
  • Application No.: US16488951
    Application Date: 2018-02-26
  • Publication No.: US10705381B2
    Publication Date: 2020-07-07
  • Inventor: Takuro Momoi
  • Applicant: Enplas Corporation
  • Applicant Address: JP Saitama
  • Assignee: ENPLAS CORPORATION
  • Current Assignee: ENPLAS CORPORATION
  • Current Assignee Address: JP Saitama
  • Agency: Brundidge & Stanger, P.C.
  • Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@3068db16
  • International Application: PCT/JP2018/006895 WO 20180226
  • International Announcement: WO2018/155676 WO 20180830
  • Main IPC: G02F1/13357
  • IPC: G02F1/13357
Light-emitting device, planar light source device and display device
Abstract:
This light-emitting device has a light-emitting element and a light flux control member. The light flux control member has an entry surface, a light control surface, a back surface, and a ring-shaped groove. The light control surface includes a first transmission portion, a total reflection portion, and a second transmission portion. The ring-shaped groove includes a first inner surface and a second inner surface. A second light beam, which is a light beam that is part of the light beam emitted from the light-emitting center of the light-emitting element, enters the interior of the light flux control member at the entry surface, is totally reflected at the total reflection portion, then internally reflected at the second inner surface, and exits from the second transmission portion to the exterior of the light flux control member.
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