Light beam expanding device, image display device, and optical device
First Claim
1. An image display device comprising:
- an image generating device;
a light guide unit on which light from the image generating device is incident, the light guide unit guiding light and outputting light toward a pupil of a viewer, the light guide unit includinga light guide plate from which incident light is output after being propagated inside by total reflection,a first deflector that is disposed in or on the light guide plate and deflects light incident on the light guide plate in such a manner that the light incident on the light guide plate is totally reflected inside the light guide plate, anda second deflector that is disposed in or on the light guide plate and deflects light propagated inside the light guide plate by total reflection a plurality of times in order to output the light propagated inside the light guide plate by total reflection from the light guide plate; and
a light beam expanding device configured to expand a light beam incident from the image generating device along a Z direction and output the light beam to the light guide unit when incident direction of light incident on the light guide plate is defined as an X direction and propagation direction of light in the light guide plate is defined as a Y direction, whereinthe light beam expanding device is composed of a first reflective mirror on which light from the image generating device is incident and a second reflective mirror on which light from the first reflective mirror is incident and that outputs light to the light guide unit,a light reflective layer of the first reflective mirror is composed of 1A-th inclined sections each having a first flat side and a second flat side opposite the first flat side and 1B-th inclined sections each having a first flat side and a second flat side opposite the first flat side, the 1A-th inclined sections and the 1B-th inclined sections being juxtaposed alternately and continuously such that the light reflective layer has a saw-tooth shape as a sectional shape,a light reflective layer of the second reflective mirror is composed of 2A-th inclined sections each having a first flat side and a second flat side opposite the first flat side and 2B-th inclined sections each having a first flat side and a second flat side opposite the first flat side, the 2A-th inclined sections and the 2B-th inclined sections being juxtaposed alternately and continuously such that the light reflective layer has a saw-tooth shape as a sectional shape,the first flat side and the second flat side of at least one of the 1A-th inclined sections are parallel to each other and are disposed in planes parallel to the Z direction,an angle formed by the second flat side of at least one of the 1A-th inclined sections and the second flat side of at least one of the 1B-th inclined sections is 90 degrees,the first flat side and the second flat side of at least one of the 2A-th inclined sections are parallel to each other and are disposed in planes parallel to the Y direction, andan angle formed by the second flat side of at least one of the 2A-th inclined sections and the second flat side of at least one of the 2B-th inclined sections is 90 degrees.
1 Assignment
0 Petitions
Accused Products
Abstract
An image display device includes an image generating device, a light guide unit, and a light beam expanding device. The light guide unit includes a light guide plate, a first deflector, and a second deflector. The light beam expanding device expands a light beam incident from the image generating device along the Z direction and outputs the light beam to the light guide unit when the incident direction of light incident on the light guide plate is defined as the X direction and the propagation direction of light in the light guide plate is defined as the Y direction. The light beam expanding device is composed of a first reflective mirror on which light from the image generating device is incident and a second reflective mirror on which light from the first reflective mirror is incident and that outputs light to the light guide unit.
31 Citations
20 Claims
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1. An image display device comprising:
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an image generating device; a light guide unit on which light from the image generating device is incident, the light guide unit guiding light and outputting light toward a pupil of a viewer, the light guide unit including a light guide plate from which incident light is output after being propagated inside by total reflection, a first deflector that is disposed in or on the light guide plate and deflects light incident on the light guide plate in such a manner that the light incident on the light guide plate is totally reflected inside the light guide plate, and a second deflector that is disposed in or on the light guide plate and deflects light propagated inside the light guide plate by total reflection a plurality of times in order to output the light propagated inside the light guide plate by total reflection from the light guide plate; and a light beam expanding device configured to expand a light beam incident from the image generating device along a Z direction and output the light beam to the light guide unit when incident direction of light incident on the light guide plate is defined as an X direction and propagation direction of light in the light guide plate is defined as a Y direction, wherein the light beam expanding device is composed of a first reflective mirror on which light from the image generating device is incident and a second reflective mirror on which light from the first reflective mirror is incident and that outputs light to the light guide unit, a light reflective layer of the first reflective mirror is composed of 1A-th inclined sections each having a first flat side and a second flat side opposite the first flat side and 1B-th inclined sections each having a first flat side and a second flat side opposite the first flat side, the 1A-th inclined sections and the 1B-th inclined sections being juxtaposed alternately and continuously such that the light reflective layer has a saw-tooth shape as a sectional shape, a light reflective layer of the second reflective mirror is composed of 2A-th inclined sections each having a first flat side and a second flat side opposite the first flat side and 2B-th inclined sections each having a first flat side and a second flat side opposite the first flat side, the 2A-th inclined sections and the 2B-th inclined sections being juxtaposed alternately and continuously such that the light reflective layer has a saw-tooth shape as a sectional shape, the first flat side and the second flat side of at least one of the 1A-th inclined sections are parallel to each other and are disposed in planes parallel to the Z direction, an angle formed by the second flat side of at least one of the 1A-th inclined sections and the second flat side of at least one of the 1B-th inclined sections is 90 degrees, the first flat side and the second flat side of at least one of the 2A-th inclined sections are parallel to each other and are disposed in planes parallel to the Y direction, and an angle formed by the second flat side of at least one of the 2A-th inclined sections and the second flat side of at least one of the 2B-th inclined sections is 90 degrees. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An optical device comprising:
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a light guide unit configured to include a light guide plate from which light incident from a light source is output after being propagated inside by total reflection, a first deflector that is disposed in or on the light guide plate and deflects light incident on the light guide plate in such a manner that the light incident on the light guide plate is totally reflected inside the light guide plate, and a second deflector that is disposed in or on the light guide plate and deflects light propagated inside the light guide plate by total reflection a plurality of times in order to output the light propagated inside the light guide plate by total reflection from the light guide plate; and a light beam expanding device configured to expand a light beam incident from the light source along a Z direction and output the light beam to the light guide unit when incident direction of light incident on the light guide plate is defined as an X direction and propagation direction of light in the light guide plate is defined as a Y direction, wherein the light beam expanding device is composed of a first reflective mirror on which light from the light source is incident and a second reflective mirror on which light from the first reflective mirror is incident and that outputs light to the light guide unit, a light reflective layer of the first reflective mirror is composed of 1A-th inclined sections each having a first flat side and a second flat side opposite the first flat side and 1B-th inclined sections each having a first flat side and a second flat side opposite the first flat side, the 1A-th inclined sections and the 1B-th inclined sections being juxtaposed alternately and continuously such that the light reflective layer has a saw-tooth shape as a sectional shape, a light reflective layer of the second reflective mirror is composed of 2A-th inclined sections each having a first flat side and a second flat side opposite the first flat side and 2B-th inclined sections each having a first flat side and a second flat side opposite the first flat side, the 2A-th inclined sections and the 2B-th inclined sections being juxtaposed alternately and continuously such that the light reflective layer has a saw-tooth shape as a sectional shape, the first flat side and the second flat side of at least one of the 1A-th inclined sections are parallel to each other and are disposed in planes parallel to the Z direction, an angle formed by the second flat side of at least one of the 1A-th inclined sections and the second flat side of at least one of the 1B-th inclined sections is 90 degrees, the first flat side and the second flat side of at least one of the 2A-th inclined sections are parallel to each other and are disposed in planes parallel to the Y direction, and an angle formed by the second flat side of at least one of the 2A-th inclined sections and the second flat side of at least one of the 2B-th inclined sections is 90 degrees. - View Dependent Claims (17)
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18. A light beam expanding device comprising:
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a first reflective mirror configured to be disposed between a light source and an irradiated surface, light from the light source being incident on the first reflective mirror; and a second reflective mirror on which light from the first reflective mirror is incident, the second reflective mirror outputting light to the irradiated surface, wherein a light reflective layer of the first reflective mirror is composed of 1A-th inclined sections each having a first flat side and a second flat side opposite the first flat side and 1B-th inclined sections each having a first flat side and a second flat side opposite the first flat side, the 1A-th inclined sections and the 1B-th inclined sections being juxtaposed alternately and continuously such that the light reflective layer has a saw-tooth shape as a sectional shape, a light reflective layer of the second reflective mirror is composed of 2A-th inclined sections each having a first flat side and a second flat side opposite the first flat side and 2B-th inclined sections each having a first flat side and a second flat side opposite the first flat side, the 2A-th inclined sections and the 2B-th inclined sections being juxtaposed alternately and continuously such that the light reflective layer has a saw-tooth shape as a sectional shape, the first flat side and the second flat side of at least one of the 1A-th inclined sections are parallel to each other and are disposed in planes parallel to the Z direction, an angle formed by the second flat side of at least one of the 1A-th inclined sections and the second flat side of at least one of the 1B-th inclined sections is 90 degrees, the first flat side and the second flat side of at least one of the 2A-th inclined sections are parallel to each other and are disposed in planes parallel to the Y direction, and an angle formed by the second flat side of at least one of the 2A-th inclined surface sections and the second flat side of at least one of the 2B-th inclined sections is 90 degrees. - View Dependent Claims (19)
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20. An image display device comprising:
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an image generating device; a light guide unit on which light from the image generating device is incident, the light guide unit guiding and outputting light; and a first reflective mirror and a second reflective mirror, wherein; the first reflective mirror and the second reflective mirror are disposed on an optical path between the image generating device and the light guide unit, each of the first reflective mirror and the second reflective mirror having a saw-tooth shape as a sectional shape and comprising peaks where flat sections of a reflective layer meet and extend along linear paths, and the linear paths of the peaks of the first reflective mirror are non-parallel with the linear paths of the peaks of the second reflective mirror.
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Specification