Projector having diffuser
First Claim
Patent Images
1. A projector, comprising:
- a light source that emits laser light; and
a diffuser positioned to receive the laser light from the light source,wherein the diffuser comprises a base material having a plurality of concave portions forming a surface such that each of the concave portions has a curved surface and that the concave portions have bottoms formed at at least two different bottom positions in a depth direction, the diffuser satisfies 2/7≤
|(n1−
n2)×
Δ
d|/λ
≤
10 where n1 is a refractive index of the base material, n2 is a refractive index of a medium around the concave portions, λ
is a wavelength of the laser light that enters the base material, and Δ
d is a range of the bottom positions of the bottoms in the depth direction, and the concave portions of the base material is formed such that a curvature radius at a boundary of two adjacent concave portions is smaller than a curvature radius of each concave portion at the bottom of the concave portion and that the bottoms of the concave portions have irregular positions with respect to a plane of the surface of the base material.
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Abstract
An optical device includes a base material including a surface on which multiple concaves are formed. The concaves include respective curved surfaces. The concaves are formed so that the bottoms of the concaves are at two or more different positions in a depth direction. In the optical device, 2/7≤|(n1−n2)×Δd|/λ≤10 holds, where n1 is the refractive index of the base material, n2 is the refractive index of a medium around the concaves, λ is the wavelength of a beam flux that enters the base material, and Δd is a range of the positions of the bottoms in the depth direction.
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Citations
24 Claims
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1. A projector, comprising:
-
a light source that emits laser light; and a diffuser positioned to receive the laser light from the light source, wherein the diffuser comprises a base material having a plurality of concave portions forming a surface such that each of the concave portions has a curved surface and that the concave portions have bottoms formed at at least two different bottom positions in a depth direction, the diffuser satisfies 2/7≤
|(n1−
n2)×
Δ
d|/λ
≤
10 where n1 is a refractive index of the base material, n2 is a refractive index of a medium around the concave portions, λ
is a wavelength of the laser light that enters the base material, and Δ
d is a range of the bottom positions of the bottoms in the depth direction, and the concave portions of the base material is formed such that a curvature radius at a boundary of two adjacent concave portions is smaller than a curvature radius of each concave portion at the bottom of the concave portion and that the bottoms of the concave portions have irregular positions with respect to a plane of the surface of the base material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A projector, comprising:
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a light source that emits laser light; and a diffuser positioned to receive the laser light from the light source, wherein the diffuser comprises a base material having a plurality of convex portions forming a surface such that each of the convex portions has a curved surface and that the convex portions have tops formed at at least two different top positions in a height direction, the diffuser satisfies 2/7≤
|(n1−
n2)×
Δ
d|/λ
≤
10 is satisfied where n1 is a refractive index of the base material, n2 is a refractive index of a medium around the convex portions, λ
is a wavelength of the laser light that enters the base material, and Δ
d is a range of the top positions of the tops in the height direction, and the convex portions of the base material is formed such that a curvature radius at a boundary of two adjacent convex portions is smaller than a curvature radius of each convex portion at the top of the convex portion and that the tops of the convex portions have irregular positions with respect to a plane of the surface of the base material. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification