Light source device
First Claim
1. A light source device comprising:
- a primary light source;
a light guide constituting a waveguide for transmitting a light outputted from the primary light source, having a refractive index of ng, and including a light input end face on which a light emitted from the primary light source is made incident, a light output surface for outputting a transmitted light, and a back surfacepositioned in a side opposite the light output surface; and
a light leakage modulator attached to at least one of the light output surface and the back surface of the light guide, and including a composite layer positioned on the light output surface or the back surface and having a plurality of first refractive indexregions each having a refractive index of n1 (here, ng>
n1) and a plurality of second refractive index regions each having a refractive index of n2 (here, n2>
n1), and a third refractive index layer positioned on the composite layer and having a refractive index of n3 (here, n3>
n1).
1 Assignment
0 Petitions
Accused Products
Abstract
The index of refraction of a light guide (6) for transmitting light outputted from a primary light source (1) is ng, and the light guide (6) has a light input end face (9), a light output surface from which the transmitted light is outputted, and a back surface opposed to the light output surface. A leaky ray modulator (8) is provided to at least either the light output surface or the back surface. The leaky ray modulator (8) has a composite layer (50) provided on the light output surface or the back surface and composed of first refractive index regions (3) having a refractive index n1 (ng>n1) and second refractive index regions (4) having a refractive index n2 (n2>n1) and a third refractive index layer (5) provided on the composite layer (50) and having a refractive index n3 (n3>n1). A reflecting plate (7) is provided adjacent to the back surface of the light guide (6).
149 Citations
36 Claims
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1. A light source device comprising:
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a primary light source; a light guide constituting a waveguide for transmitting a light outputted from the primary light source, having a refractive index of ng, and including a light input end face on which a light emitted from the primary light source is made incident, a light output surface for outputting a transmitted light, and a back surface positioned in a side opposite the light output surface; and a light leakage modulator attached to at least one of the light output surface and the back surface of the light guide, and including a composite layer positioned on the light output surface or the back surface and having a plurality of first refractive index regions each having a refractive index of n1 (here, ng>
n1) and a plurality of second refractive index regions each having a refractive index of n2 (here, n2>
n1), and a third refractive index layer positioned on the composite layer and having a refractive index of n3 (here, n3>
n1). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A surface light source device comprising:
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at least one point-shaped light source; a rectangular light guide having a light input surface on which a light from the point-shaped light source is made incident and a light output surface for outputting an inputted light; and a directional light output function unit formed in a back surface of the light guide opposite the light output surface by arraying many arc-shaped elongated prisms each including two prism surfaces to surround the point-shaped light source in parallel with one another. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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Specification