Image combiner and image display device
First Claim
1. An image combiner comprising:
- a lens element, including a convex lens and a concave lens, that guides a light flux from an image forming means;
a substrate disposed in front of a user'"'"'s eye, the substrate being transparent to visible light, and introducing the light flux emitted from the lens element;
a reflection region inner-reflecting the light flux introduced from the image forming means into the substrate, the reflection region being a part of one surface of the substrate; and
a polarization beam splitter to which the light flux reflected at the reflection region enters twice and which makes the light flux entering for a second time incident on the user'"'"'s eye outside the substrate, the polarization beam splitter being installed in the substrate, whereinat least an angle θ
0 between a line that is perpendicular to the reflection region and a principal ray of a portion flux of the light flux that directly enters the user'"'"'s eye satisfies a condition of 3°
≦
θ
0, the portion flux being a flux emitted from a center of a display surface of the image forming means; and
an inclination direction of the light flux heading into the user'"'"'s eye relative to the line that is perpendicular is set so to make a display position of a virtual image of the display surface to be at a position in an obliquely downward direction from the user'"'"'s eye.
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Accused Products
Abstract
The present invention aims to provide an image combiner and an image display device which can easily have a wide field of view and reduce a thickness of a substrate while reducing loss of light intensity by means of a PBS. An image combiner includes a substrate transparent to visible light; and a polarization beam splitter installed in the substrate to reflect a light flux introduced into the substrate from an image-display element and to make the light flux incident on an exit pupil outside the substrate. An exit angle θ0 at which a principal ray of the light flux emitted from a center of a display surface of the image-display element is emitted from a surface of the substrate toward a center of the exit pupil satisfies a condition of 3°≦θ0.
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Citations
14 Claims
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1. An image combiner comprising:
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a lens element, including a convex lens and a concave lens, that guides a light flux from an image forming means; a substrate disposed in front of a user'"'"'s eye, the substrate being transparent to visible light, and introducing the light flux emitted from the lens element; a reflection region inner-reflecting the light flux introduced from the image forming means into the substrate, the reflection region being a part of one surface of the substrate; and a polarization beam splitter to which the light flux reflected at the reflection region enters twice and which makes the light flux entering for a second time incident on the user'"'"'s eye outside the substrate, the polarization beam splitter being installed in the substrate, wherein at least an angle θ
0 between a line that is perpendicular to the reflection region and a principal ray of a portion flux of the light flux that directly enters the user'"'"'s eye satisfies a condition of 3°
≦
θ
0, the portion flux being a flux emitted from a center of a display surface of the image forming means; andan inclination direction of the light flux heading into the user'"'"'s eye relative to the line that is perpendicular is set so to make a display position of a virtual image of the display surface to be at a position in an obliquely downward direction from the user'"'"'s eye. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification