发明申请
- 专利标题: OPTICAL ELEMENT, LIGHT DIFFUSING ELEMENT, AND IMAGE DISPLAY APPARATUS
- 专利标题(中): 光学元件,光扩散元件和图像显示设备
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申请号: US13972027申请日: 2013-08-21
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公开(公告)号: US20140071026A1公开(公告)日: 2014-03-13
- 发明人: Chieko HATASHITA , Takayuki Nakamura , Hiroshi Nakanuma , Kentaroh Hagita
- 申请人: Chieko HATASHITA , Takayuki Nakamura , Hiroshi Nakanuma , Kentaroh Hagita
- 优先权: JP2012-199808 20120911
- 主分类号: F21V5/00
- IPC分类号: F21V5/00 ; G09G5/10
摘要:
An optical element using visible light from wavelengths λS to λL (λL>λS), is formed of a translucent material having refractive indexes nS and nL, respectively, for light having the wavelengths λS and λL. The optical element includes an incident face; an exit face; and a micro convexo-concave structure used as an anti-reflection structure (ARS), being formed at least one of the incident face and the exit face. An average distance P between adjacent micro convexo-concave structures satisfies condition (1) P≦0.8·λS/nS. Dimensionless parameters mS and mL satisfy condition (2) 0.8≦mS≦1.1 and condition (3) 0.8≦mL≦1.1. The parameters mS and mL, an average height H, the wavelengths λS and λL, and the refractive indexes nS and nL of the micro convexo-concave structure satisfy condition (4) mS·λS/(2·nS)≦H≦mL·λL/(2·nL).
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