VIRTUAL IMAGE DISPLAY APPARATUS
First Claim
1. A virtual image display apparatus that causes an observer to visually recognize image light and external light at the same time, comprising:
- an image element that generates image light; and
a single prism that has three or more non-axisymmetric curved surfaces and forms a part of an optical system, in which an intermediate image is formed therein,wherein when the observer visually recognizes an external scene through a first surface and a third surface among the plurality of surfaces that form the prism, diopter is about 0,wherein the first surface and the third surface form concave surfaces with respect to the observer, andwherein the image light from the image element is totally reflected on the third surface, is totally reflected on the first surface, and is reflected on a second surface and then passes through the first surface to reach the observer.
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Accused Products
Abstract
An intermediate image is formed inside a prism by a projection lens and the like. Image light, totally reflected, in the order of a third surface, a first surface and a second surface, on two or more surfaces thereof, reaches an eye of an observer after passing through the first surface. Thus, it is possible to decrease the thickness of the prism and to reduce the size and weight of the entire optical system. Further, it is possible to realize a bright high-performance display with a wide viewing angle. With respect to external light, it is possible to pass the external light through the first surface and the third surface, for example, for observation. Further, by setting diopter at this time to about 0, it is possible to reduce defocusing or warp of the external light when the external light is observed in a see-through manner.
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Citations
14 Claims
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1. A virtual image display apparatus that causes an observer to visually recognize image light and external light at the same time, comprising:
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an image element that generates image light; and a single prism that has three or more non-axisymmetric curved surfaces and forms a part of an optical system, in which an intermediate image is formed therein, wherein when the observer visually recognizes an external scene through a first surface and a third surface among the plurality of surfaces that form the prism, diopter is about 0, wherein the first surface and the third surface form concave surfaces with respect to the observer, and wherein the image light from the image element is totally reflected on the third surface, is totally reflected on the first surface, and is reflected on a second surface and then passes through the first surface to reach the observer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification