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 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).
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).
93 Citations
60 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, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. 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 (48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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Specification