发明名称 |
ILLUMINATING LENS, LIGHTING DEVICE, SURFACE LIGHT SOURCE, AND LIQUID-CRYSTAL DISPLAY APPARATUS |
摘要 |
A light exit surface of an illuminating lens has a first light exit surface and a second light exit surface. The first light exit surface is recessed toward a point on the optical axis, and the second light exit surface extends outwardly from the periphery of the first light exit surface. The first light exit surface has a transmissive region and a total reflection region. When the position of a light source on the optical axis is defined as a starting point, the transmissive region transmits light that has been emitted from the starting point at a relatively small angle with respect to the optical axis, and the total reflection region totally reflects light that has been emitted from the starting point at a relatively large angle with respect to the optical axis. A bottom surface that surrounds a light entrance surface and faces oppositely to the light exit surface is provided with a projecting portion or a recessed portion for reflecting light that has been emitted from the light source, totally reflected repeatedly at the light exit surface, and then reached the bottom surface.
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申请公布号 |
US2010208166(A1) |
申请公布日期 |
2010.08.19 |
申请号 |
US20100704926 |
申请日期 |
2010.02.12 |
申请人 |
PANASONIC CORPORATION |
发明人 |
IIYAMA TOMOKO;KIMURA SYUNSUKE;MATSUKI DAIZABURO |
分类号 |
G02F1/1335;F21V1/00;F21V5/04 |
主分类号 |
G02F1/1335 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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