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1. (WO2017057051) DIFFUSION LENS, LIGHT EMITTING APPARATUS, AND INJECTION MOLDING MOLD FOR DIFFUSION LENS

Pub. No.:    WO/2017/057051    International Application No.:    PCT/JP2016/077424
Publication Date: Fri Apr 07 01:59:59 CEST 2017 International Filing Date: Sat Sep 17 01:59:59 CEST 2016
IPC: G02B 3/00
F21V 5/00
F21V 5/04
G02B 13/00
G02B 13/18
H01L 33/58
F21Y 115/10
Applicants: IP LABO CORPORATION
IP Labo株式会社
Inventors: MATSUMOTO Koichi
松本 浩一
KITAMURA Eiji
北村 英二
TAHARA Yuichi
田原 雄一
Title: DIFFUSION LENS, LIGHT EMITTING APPARATUS, AND INJECTION MOLDING MOLD FOR DIFFUSION LENS
Abstract:
[Problem] To provide a diffusion lens that has a high degree of freedom for designing a surface shape, that can be easily designed and molded, and that is capable of reducing variation in luminance. [Solution] A lens (4) according to the present invention has a circular shape in a plan view, wherein an obverse surface (6) and a reverse surface (8) are each formed to be substantially symmetrical with respect to the center axis X passing through the center of the circular shape, a recessed incident part (9), on which a light from an LED (2) placed such that an optical axis matches the center axis X is incident, is provided in the central portion of the reverse surface (8), and the reverse surface (8) is formed into a tapered shape inclined upward at a predetermined angle when viewed from the incident part (9) side.