US 7,004,610 B2 · Light source device

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).

Claims36

Dependent claims

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).

3 more elements

Dependencies are inferred from the claim text.

Light source device

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Light source device

Life of this patent

Abstract

Claims36