VIRTUAL IMAGE DISPLAY APPARATUS
First Claim
1. A virtual image display apparatus comprising:
- a light guide member which includes two or more non-axisymmetric curved surfaces and is a part of an optical system, an intermediate image being formed inside the light guide member, wherein the light guide member comprises;
a first surface; and
a third surface arranged to face the first surface; and
a video element which generates video light that is totally reflected by the third surface, is totally reflected by the first surface, is reflected by a second surface, is transmitted through the first surface, and reaches an eyes of an observer to provide video to the observer,wherein in regard to a light flux reversed with respect to an advancing direction of video light from a position of an incidence pupil to be assumed as a position where the eyes of the observer are arranged toward an arbitrary point of video, a spreading width of the light flux at each position within a whole range excluding the vicinity of the video element is greater than a spreading width of the light flux on the video element.
1 Assignment
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Accused Products
Abstract
A light guide member includes a plurality of non-axisymmetric curved surfaces, whereby a wide viewing angle and reduction in size and weight are achieved as the whole apparatus. A curved surface is formed such that a blur amount of video light on a position of an image surface of an intermediate image is greater (for example, greater than 10 times a blur amount on a position of an image surface of a video element). With this, even when there is a scratch, dust, or stain on the surface of the light guide member near the intermediate image or there is a contaminant or air bubble inside the light guide member, a situation in which the scratch or the like is enlarged and noticeable to degrade video quality is avoided, and high performance is achieved.
12 Citations
12 Claims
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1. A virtual image display apparatus comprising:
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a light guide member which includes two or more non-axisymmetric curved surfaces and is a part of an optical system, an intermediate image being formed inside the light guide member, wherein the light guide member comprises; a first surface; and a third surface arranged to face the first surface; and a video element which generates video light that is totally reflected by the third surface, is totally reflected by the first surface, is reflected by a second surface, is transmitted through the first surface, and reaches an eyes of an observer to provide video to the observer, wherein in regard to a light flux reversed with respect to an advancing direction of video light from a position of an incidence pupil to be assumed as a position where the eyes of the observer are arranged toward an arbitrary point of video, a spreading width of the light flux at each position within a whole range excluding the vicinity of the video element is greater than a spreading width of the light flux on the video element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A virtual image display apparatus comprising:
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a light guide member which includes two or more non-axisymmetric curved surfaces and is a part of an optical system, an intermediate image being formed inside the light guide member, the light guide member comprising; a first surface; and a third surface that is arranged to face the first surface; and a video element which generates video light that is totally reflected by the third surface, is totally reflected by the first surface, is reflected by a second surface, is transmitted through the first surface, and reaches an observation side, wherein a first condensing position where video light is most condensed in a first optical axis direction when light flux of video light is cut in a first direction and a second condensing position where video light is most condensed in a second optical axis direction when cut in a second direction orthogonal to the first direction, wherein the first and second directions are separated from a position relating to the optical axis direction of the image surface of the intermediate image, and wherein a length of the distance between the first condensing position to the second condensing position is greater than a total length of a width of the light flux relating to the first direction at the first condensing position and a width of the light flux relating to the second direction at the second condensing position.
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12. A virtual image display apparatus comprising:
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a light guide member configured to form an intermediate image therein and comprising; a first surface; and a third surface arranged with the first surface so that the first and third surfaces face each other; and a video element which generates light that is reflected by the third surface, is reflected by the first surface, is reflected by a second surface, is transmitted through the first surface, and then reaches an observation side, wherein when a light flux is reversed with respect to an advancing direction of light from a position of an incidence pupil, a spreading width of the light flux at each position within the light guide member is greater than a spreading width of the light flux on the video element.
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Specification