Display light projection optical device
First Claim
1. A display light projection optical device, having characteristics in which display light emitted from a display unit is reflected in a vicinity of one surface and is projected to a predetermined eye point, and in which external light incident on an other surface is transmitted in a thickness direction, the display light projection optical device comprising:
- a first optical member that is transparent and is formed in a thin plate shape;
a Fresnel-shaped portion that is formed by a plurality of grooves which are concentric with each other on one surface of the first optical member in a thickness direction thereof;
a half mirror layer that is formed on a surface of a Fresnel-shaped portion;
a second optical member that is formed of a transparent filler for filling unevenness of a surface of the half mirror layer to form a flat surface; and
a third optical member that has a transparent thin plate shape and protects an outside surface of the second optical member,a refractive index of the first optical member, a refractive index of the second optical member, and a refractive index of the third optical member are substantially equal.
2 Assignments
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Accused Products
Abstract
There are provided a first optical member that is transparent and is formed in a thin plate shape; a Fresnel-shaped portion that is formed in a concentric form on one surface of the first optical member in the thickness direction; a half mirror layer that is formed on a surface of a Fresnel-shaped portion; a second optical member that is formed of a transparent filler for filling unevenness of a surface of the half mirror layer to form a flat surface; and a third optical member that has a transparent thin plate shape protecting an outside surface of the second optical member. A refractive index of the first optical member, a refractive index of the second optical member, and a refractive index of the third optical member are equal.
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Citations
12 Claims
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1. A display light projection optical device, having characteristics in which display light emitted from a display unit is reflected in a vicinity of one surface and is projected to a predetermined eye point, and in which external light incident on an other surface is transmitted in a thickness direction, the display light projection optical device comprising:
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a first optical member that is transparent and is formed in a thin plate shape; a Fresnel-shaped portion that is formed by a plurality of grooves which are concentric with each other on one surface of the first optical member in a thickness direction thereof; a half mirror layer that is formed on a surface of a Fresnel-shaped portion; a second optical member that is formed of a transparent filler for filling unevenness of a surface of the half mirror layer to form a flat surface; and a third optical member that has a transparent thin plate shape and protects an outside surface of the second optical member, a refractive index of the first optical member, a refractive index of the second optical member, and a refractive index of the third optical member are substantially equal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification