发明名称 |
Planar illumination device, and image display device |
摘要 |
A laser light source (1) emits a beam. A collimator lens (2) converts the beam emitted from the laser light source (1) into first substantially parallel light. A lenticular lens (3) expands a beam of the first substantially parallel light converted by the collimator lens (2) into a linear shape in a first direction. A Fresnel lens (4) converts the beam expanded in the first direction by the lenticular lens (3) into second substantially parallel light. A free curved surface mirror (5) has a reflecting surface formed into a free curved surface, and expands a beam of the second substantially parallel light converted by the Fresnel lens (4) into a planar shape in a second direction orthogonal to the first direction. This arrangement enables to provide a planar illumination device with a small thickness and high light use efficiency.
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申请公布号 |
US8154685(B2) |
申请公布日期 |
2012.04.10 |
申请号 |
US20080519947 |
申请日期 |
2008.10.22 |
申请人 |
NAKAYAMA KENJI;SHIKII SHINICHI;YAMAMOTO KAZUHISA;NAGATA TAKAYUKI;PANASONIC CORPORATION |
发明人 |
NAKAYAMA KENJI;SHIKII SHINICHI;YAMAMOTO KAZUHISA;NAGATA TAKAYUKI |
分类号 |
G02F1/1335;G09F13/04 |
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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