Image display apparatus
First Claim
1. An image display apparatus comprising:
- an image display device for displaying an image; and
an ocular optical system for leading said image to an observer'"'"'s eyeball,said ocular optical system having at least three optical surfaces having optical action,said three optical surfaces consisting ofan exit surface disposed on an observer'"'"'s eyeball side of said ocular optical system and having a transmitting action,an entrance surface disposed on an image display device side of said ocular optical system so as to be in contact with an air layer, said entrance surface having a transmitting action by which light from said air layer passes through said entrance surface and a totally reflecting action by which light is totally reflected at a side of said entrance surface opposite to said air layer, anda reflecting surface disposed to face opposite to said image display device across said entrance surface,at least said entrance surface and exit surface forming a prism member in which said entrance surface and said exit surface face each other across a medium having a refractive index larger than 2,said exit surface being a nonplanar surface having a curved surface configuration that gives a power to a bundle of light rays, andat least one of said entrance surface and said reflecting surface being formed from a non-rotationally symmetric aspherical surface configuration having an action by which decentration aberrations produced upon reflection are corrected.
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Accused Products
Abstract
An image display apparatus which enables observation of a clear image at a wide field angle with substantially no reduction in the brightness of the observation image, and which is extremely small in size and light in weight and hence unlikely to cause the observer to be fatigued. The image display apparatus includes an image display device (6) for displaying an image, and an ocular optical system (7) for projecting the image displayed by the image display device (6) and for leading the projected image to an observer'"'"'s eyeball (1). The ocular optical system (7) has at least three surfaces, and a space formed by the at least three surfaces is filled with a medium having a refractive index larger than 1. The at least three surfaces are, in the order from the observer'"'"'s eyeball (1) toward the image display device (6), a first surface (3) which is a refracting surface, a second surface (4) which is decentered or tilted with respect to an observer'"'"'s visual axis (2) and serves as both an internally reflecting surface and a refracting surface, and a third surface (5) which is a reflecting surface of positive power facing the second surface (4). Internal reflection at the second surface (4) is total reflection.
59 Citations
25 Claims
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1. An image display apparatus comprising:
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an image display device for displaying an image; and an ocular optical system for leading said image to an observer'"'"'s eyeball, said ocular optical system having at least three optical surfaces having optical action, said three optical surfaces consisting of an exit surface disposed on an observer'"'"'s eyeball side of said ocular optical system and having a transmitting action, an entrance surface disposed on an image display device side of said ocular optical system so as to be in contact with an air layer, said entrance surface having a transmitting action by which light from said air layer passes through said entrance surface and a totally reflecting action by which light is totally reflected at a side of said entrance surface opposite to said air layer, and a reflecting surface disposed to face opposite to said image display device across said entrance surface, at least said entrance surface and exit surface forming a prism member in which said entrance surface and said exit surface face each other across a medium having a refractive index larger than 2, said exit surface being a nonplanar surface having a curved surface configuration that gives a power to a bundle of light rays, and at least one of said entrance surface and said reflecting surface being formed from a non-rotationally symmetric aspherical surface configuration having an action by which decentration aberrations produced upon reflection are corrected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An objective optical system having an aperture diaphragm and forming an object image, said objective optical system comprising at least three optical surfaces having optical action,
said three optical surfaces consisting of an entrance surface disposed on an aperture diaphragm side of said objective optical system and having a transmitting action, an exit surface disposed on an object image side of said objective optical system and having a transmitting action and a totally reflecting action, and a reflecting surface disposed to face opposite to said object image side of said objective optical system across said exit surface, at least said exit surface and entrance surface forming a prism member in which said exit surface and said entrance surface face each other across a medium having a refractive index larger than 1, said entrance surface being a nonplanar surface having a curved surface configuration that gives a power to a bundle of light rays, and at least one of said exit surface and said reflecting surface being formed from a non-rotationally symmetric aspherical surface configuration having an action by which decentration aberrations produced upon reflection are corrected.
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24. A camera according to claimed 23, wherein said objective optical system is disposed in a photographic optical system.
Specification