Virtual image display apparatus including a light guide member having four or more curved surfaces
First Claim
Patent Images
1. A virtual image display apparatus comprising:
- a video element which generates video light; and
a light guide member which includes four or more curved surfaces including three or more non-axisymmetric curved surfaces,wherein the video light emitted from the video element and passing through the light guide member is displayed to an observer on a divergent optical path in an enlarged manner,the light guide member includes at least three surfaces of a first surface, a second surface, and a third surface as the four or more curved surfaces, reflection of the video light is made four times by four surfaces different from one another in the inside of the light guide member, total reflection is performed on the third surface as a second reflection among the four times of reflections, total reflection is performed on the first surface as a third reflection, reflection is performed on the second surface as the fourth reflection, and the video light reaches the eyes of the observer by being transmitted through the first surface, andthe following condition (1) is satisfied with a coefficient of a term xm·
yn of a polynomial expression representing a k-th surface as Akm,n, when an expression of a surface shape z is expanded as a polynomial with respect to x and y, by setting origins of respective surfaces constituting the light guide member as references, employing orthogonal coordinates x and y extending in a tangential direction, and setting y as a direction orthogonal to a predetermined symmetric plane;
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(1).
1 Assignment
0 Petitions
Accused Products
Abstract
A light guide member includes four or more curved surfaces including three or more non-axisymmetric curved surfaces so that video light emitted from a video element and passing through the light guide member is displayed to an observer on a divergent optical path in an enlarged manner. Reflection of the video light is made four times by four surfaces different from one another in the inside of the light guide member, such that at least total reflection is performed on a third surface as a second reflection among the four times of reflections, total reflection is performed on a first surface as a third reflection, reflection is performed on a second surface as the fourth reflection, and the video light reaches the eyes of the observer by being transmitted through the first surface.
11 Citations
20 Claims
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1. A virtual image display apparatus comprising:
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a video element which generates video light; and a light guide member which includes four or more curved surfaces including three or more non-axisymmetric curved surfaces, wherein the video light emitted from the video element and passing through the light guide member is displayed to an observer on a divergent optical path in an enlarged manner, the light guide member includes at least three surfaces of a first surface, a second surface, and a third surface as the four or more curved surfaces, reflection of the video light is made four times by four surfaces different from one another in the inside of the light guide member, total reflection is performed on the third surface as a second reflection among the four times of reflections, total reflection is performed on the first surface as a third reflection, reflection is performed on the second surface as the fourth reflection, and the video light reaches the eyes of the observer by being transmitted through the first surface, and the following condition (1) is satisfied with a coefficient of a term xm·
yn of a polynomial expression representing a k-th surface as Akm,n, when an expression of a surface shape z is expanded as a polynomial with respect to x and y, by setting origins of respective surfaces constituting the light guide member as references, employing orthogonal coordinates x and y extending in a tangential direction, and setting y as a direction orthogonal to a predetermined symmetric plane;
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(1). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A virtual image display apparatus comprising:
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a video element which generates video light; and a light guide member which includes four or more curved surfaces including three or more non-axisymmetric curved surfaces, wherein the video light emitted from the video element and passing through the light guide member is displayed to an observer on a divergent optical path in an enlarged manner, the light guide member includes at least three surfaces of a first surface, a second surface, and a third surface as the four or more curved surfaces, reflection of the video light is made four times by four surfaces different from one another in the inside of the light guide member, total reflection is performed on the third surface as a second reflection among the four times of reflections, total reflection is performed on the first surface as a third reflection, reflection is performed on the second surface as the fourth reflection, and the video light reaches the eyes of the observer by being transmitted through the first surface, and a half mirror is formed on the second surface, video light is presented to the observer, a light transmission member is integrally arranged on the outside of the second surface, a diopter to external light is set to substantially 0, and external light and video light are presented to the observer in an overlapping manner. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification
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Current AssigneeSeiko Epson Corporation (Seiko Group)
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Original AssigneeSeiko Epson Corporation (Seiko Group)
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InventorsKomatsu, Akira, Totani, Takahiro, Takagi, Masayuki, Takeda, Takashi, Miyao, Toshiaki
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Primary Examiner(s)Spar, Ilana
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Assistant Examiner(s)HERMANN, KIRK W
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Application NumberUS14/528,410Publication NumberTime in Patent Office726 DaysField of SearchNoneUS Class Current1/1CPC Class CodesG02B 2027/011 comprising device for corre...G02B 2027/0178 Eyeglass type eyeglass deta...G02B 27/017 Head mounted
