| CPC G02B 27/0172 (2013.01) [G02B 6/0035 (2013.01); G02B 6/0076 (2013.01); G02B 2027/012 (2013.01); G02B 2027/0118 (2013.01)] | 15 Claims |
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1. An image display device for displaying a virtual image before a user's eyes, the image display device comprising:
a) an image emitting unit including a display portion for forming two-dimensional image information, the image emitting unit being configured to form parallel light rays different in an angle at each part on an image and cause the parallel light rays to be incident on a first light guide to be described later as image light;
b) the first light guide including a first transparent substrate having two opposing surfaces, a first incident portion for guiding the image light to an inside of the first transparent substrate, and a first emitting portion for emitting the image light guided to the inside of the first transparent substrate by the first incident portion and propagated in the first transparent substrate to an outside of the first transparent substrate, the first incident portion and the first emitting portion being formed in the first transparent substrate;
c) a second light guide including a second transparent substrate having a first surface facing one of the two opposing surfaces of the first transparent substrate of the first light guide on a side where the image light is emitted by the first emitting portion of the first light guide and a second surface opposing the first surface, a second incident portion for guiding the image light emitted from the first light guide to an inside of the second transparent substrate of the second light guide, and a second emitting portion for guiding the image light to the user's eyes, the image light being guided by the second incident portion of the second light guide and propagated in the second transparent substrate of the second light guide while being reflected by the first surface and the second surface of the second transparent substrate of the second light guide; and
a reflection suppressing portion,
wherein the reflection suppressing portion is configured to prevent or reduce a reflection of light from the inside of the first transparent substrate of the first light guide, and is provided at a portion of at least one surface of the first transparent substrate of the first light guide, such that some light from inside of the first transparent substrate of the first light guide enters the reflection suppressing portion and light reflecting into the first transparent substrate of the first light guide is reduced or prevented, and
wherein the first light guide is a rectilinear propagation light guide in which light exiting the first light guide to the second light guide consists of light propagated through the first transparent substrate after being guided by the first incident portion, reaching the first emitting portion without repeatedly being reflected by the two opposing surfaces of the first transparent substrate, and being taken out to the outside of the first transparent substrate.
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