Invention Grant
- Patent Title: Light flux controlling member, light emitting device, surface light source device and display device
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Application No.: US17204047Application Date: 2021-03-17
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Publication No.: US11313533B2Publication Date: 2022-04-26
- Inventor: Takuro Momoi
- Applicant: Enplas Corporation
- Applicant Address: JP Saitama
- Assignee: Enplas Corporation
- Current Assignee: Enplas Corporation
- Current Assignee Address: JP Saitama
- Priority: JPJP2020-047743 20200318
- Main IPC: F21V5/04
- IPC: F21V5/04 ; G02F1/1335 ; F21V33/00 ; F21V5/00

Abstract:
A light flux controlling member includes an incidence surface, a reflection surface, an annular groove and an emission surface. The annular groove is disposed so as not to intersect an optical path of light incident on the incidence surface, reflected by the reflection surface, and reaching the emission surface. The first annular surface is formed so that its distance from the central axis increases, from the back side to the front side, and refracts, toward the front surface, light emitted from the light emitting center of the light emitting element, and directly reaching the first annular surface. The second annular surface is formed so that its distance from the central axis increases, from the back side to the front side, and refracts, toward the front side, light emitted from the light emitting element, incident on the incidence surface, and directly reaching the second annular surface.
Public/Granted literature
- US20210293396A1 LIGHT FLUX CONTROLLING MEMBER, LIGHT EMITTING DEVICE, SURFACE LIGHT SOURCE DEVICE AND DISPLAY DEVICE Public/Granted day:2021-09-23
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