Image display apparatus
First Claim
1. In an image display apparatus comprising an image display device which displays an image, and an ocular optical system which projects the image formed by said image display device and leads the image to an eyeball of an observer,the improvement wherein said ocular optical system has two surfaces, i.e. a first surface and a second surface, in which a space formed by said two surfaces is filled with a medium having a refractive index larger than 1,wherein at least one of the surfaces of said ocular optical system is a non-rotationally symmetric aspherical surface decentered or tilted with respect to an observer'"'"'s visual axis, andwherein said first surface is a transmitting surface which serves as both an entrance surface for light rays emitted from said image display device and an exit surface through which the light rays exit from said ocular optical system, said first surface being convex toward the observer.
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Accused Products
Abstract
An image display apparatus capable of providing a clear observation image at a wide field angle by using an ocular optical system including an optical element having a minimal number of constituent surfaces. The apparatus includes an image display device (5) which displays an image, and an ocular optical system (4) which projects the image formed by the image display device (5) and leads the image to an observer'"'"'s eyeball (3). The ocular optical system (4) has two surfaces, i.e. a first surface (11) and a second surface (12). A space formed by the two surfaces is filled with a medium having a refractive index larger than 1. At least one surface of the ocular optical system (4) is a non-rotationally symmetric aspherical surface decentered or tilted with respect to an observer'"'"'s visual axis (2). The first surface (11) is a transmitting surface which serves as both an entrance surface for light rays emitted from the image display device (5) and an exit surface through which the light rays exit from the ocular optical system (4). The first surface (11) is convex toward the observer.
38 Citations
11 Claims
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1. In an image display apparatus comprising an image display device which displays an image, and an ocular optical system which projects the image formed by said image display device and leads the image to an eyeball of an observer,
the improvement wherein said ocular optical system has two surfaces, i.e. a first surface and a second surface, in which a space formed by said two surfaces is filled with a medium having a refractive index larger than 1, wherein at least one of the surfaces of said ocular optical system is a non-rotationally symmetric aspherical surface decentered or tilted with respect to an observer'"'"'s visual axis, and wherein said first surface is a transmitting surface which serves as both an entrance surface for light rays emitted from said image display device and an exit surface through which the light rays exit from said ocular optical system, said first surface being convex toward the observer.
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2. In an image display apparatus comprising an image display device which displays an image, and an ocular optical system which projects the image formed by said image display device and leads the image to an eyeball of an observer,
the improvement wherein said ocular optical system has a prism member, said prism member including a first surface having an action through which light rays emitted from said image display device enter said prism member and exit therefrom, said prism member further including a second surface having an action by which the light rays entering through said first surface are reflected, wherein a space between said first surface and said second surface is filled with a medium having a refractive index larger than 1, and wherein said first and second surfaces each have a non-rotationally symmetric aspherical surface configuration having an action by which the image formed by said image display device is projected into the observer'"'"'s eyeball as an enlarged image, said non-rotationally symmetric aspherical surface configuration further having an action by which aberrations caused by decentration are corrected.
Specification