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1. (WO2018139157) LIGHTING DEVICE AND HEAD-UP DISPLAY DEVICE

Pub. No.:    WO/2018/139157    International Application No.:    PCT/JP2017/046835
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Thu Dec 28 00:59:59 CET 2017
IPC: F21S 2/00
G02B 27/01
G02F 1/13357
Applicants: HAYASHI TELEMPU CORPORATION
林テレンプ株式会社
Inventors: KOYAMA, Jun
小山 潤
Title: LIGHTING DEVICE AND HEAD-UP DISPLAY DEVICE
Abstract:
Provided is a lighting device enabling a reduction in power consumption and a reduction in costs, and enabling space-saving. The invention comprises: a plurality of light sources (10), each transmitting illumination light (L1) oriented in the same direction; a condenser lens (20) disposed on the delivery surface side of the plurality of light sources (10), having a plurality of convex lens units (22) corresponding respectively to the plurality of light sources (10), each of the convex lens units (22) condensing the illumination light (L1) transmitted from the corresponding light source (10); a Fresnel lens array (30) disposed on the transmitting surface side of the condenser lens (20), having a plurality of Fresnel lenses (34) corresponding respectively to the plurality of convex lens units (22), each of the Fresnel lenses converting into a parallel light (L3) the corresponding illumination light (L2) transmitted from the corresponding convex lens unit; and a prism plate (40) disposed on the transmitting surface side of the Fresnel lens array (30), through which enters illumination light (L3) transmitted from the Fresnel lens array (30) to exit as illumination light (L4) such that the luminance thereof is made uniform in a planar direction compared to the illumination light (L3).