Surface light source and light guide used therefor
First Claim
1. A plate-shaped light guide for a planar light source device, which guides light emitted from a primary light source, the light guide comprising:
- a light incident face which the light emitted from the primary light source enters and a light emitting face from which the guided light is emitted, wherein the light emitting face is a finely uneven surface, an average slant angle θ
a of the finely uneven surface is in a range of 0.3°
to 30°
, and a ten-point average roughness Rz is in a range of 0.7 μ
m to 10 μ
m.
1 Assignment
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Accused Products
Abstract
A light guide (4) for guiding light emitted from a primary light source (2), having a light incident face (41) which light emitted from the primary light source (2) enters and a light emitting face (43) from which the guided light is emitted. The light emitting face (43) is uneven surface having a large number of micro convex curved surface areas. The average slant angle θa is 0.3° to 30°. The ten-point average roughness Rz is 0.7 μm to 10 μm. A light deflector (6) composed of a prism sheet is disposed beside the light emitting face (43).
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Citations
10 Claims
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1. A plate-shaped light guide for a planar light source device, which guides light emitted from a primary light source, the light guide comprising:
- a light incident face which the light emitted from the primary light source enters and a light emitting face from which the guided light is emitted,
wherein the light emitting face is a finely uneven surface, an average slant angle θ
a of the finely uneven surface is in a range of 0.3°
to 30°
, and a ten-point average roughness Rz is in a range of 0.7 μ
m to 10 μ
m. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a light incident face which the light emitted from the primary light source enters and a light emitting face from which the guided light is emitted,
Specification