Optical system and optical apparatus
First Claim
1. An image-forming optical system which forms an image of an object,said image-forming optical system comprising:
- at least one prism member,wherein said prism member has a first surface, a second surface, a third surface, and a fourth surface,wherein said first, second, third and fourth surfaces face each other across a prism medium, so that light from an object side of said prism member enters said prism member by passing through said first surface and is reflected by said second surface and further reflected by said third surface, and the reflected light exits from said prism member by passing through said fourth surface, andwherein at least one of said second surface and said third surface has a surface configuration formed from a rotationally asymmetric curved surface.
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Accused Products
Abstract
An image display apparatus which enables observation of a clear image at a wide field angle, 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 has an image display device (7) and an ocular optical system for projecting the image of the image display device and leading the projected image to an observer'"'"'s eyeball (1) The ocular optical system has, in the order of backward ray tracing, a first surface (3) which is a refracting surface, a second surface (4) which is a decentered reflecting surface of positive power, a third surface (5) which is a decentered reflecting surface, and a fourth surface (6) which is a refracting surface. At least two of the four surfaces have a finite curvature radius. A space formed by the first to fourth surfaces (3 to 6) is filled with a medium having a refractive index larger than 1. The two reflecting surfaces are disposed such that the principal ray extending from the observer'"'"'s eyeball (1) to the image display device (7) does not intersect its own path in the ocular optical system. Thus, the first-order image of the image display device (7) is formed on the retina of the observer'"'"'s eyeball.
58 Citations
57 Claims
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1. An image-forming optical system which forms an image of an object,
said image-forming optical system comprising: -
at least one prism member, wherein said prism member has a first surface, a second surface, a third surface, and a fourth surface, wherein said first, second, third and fourth surfaces face each other across a prism medium, so that light from an object side of said prism member enters said prism member by passing through said first surface and is reflected by said second surface and further reflected by said third surface, and the reflected light exits from said prism member by passing through said fourth surface, and wherein at least one of said second surface and said third surface has a surface configuration formed from a rotationally asymmetric curved surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An ocular optical system arranged to lead an image formed on an image plane to an observer'"'"'s eyeball,
said ocular optical system comprising at least one prism member, wherein said prism member has a first surface, a second surface, a third surface, and a fourth surface, wherein said first, second, third and fourth surfaces face each other across a prism medium, so that light from the image enters said prism member by passing through said fourth surface and is reflected by said third surface and further reflected by said second surface, and the reflected light exits from said prism member by passing through said first surface, wherein at least one of said second surface and said third surface is formed from a rotationally asymmetric curved surface.
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52. A finder optical system comprising:
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an objective optical system for forming an object image; an image erecting optical system for erecting said object image; an ocular optical system for observing said object image; and at least one prism member, wherein said prism member has four surfaces including; two reflecting surfaces having an action by which the image is reflected in said prism member; an entrance surface having a light-transmitting action; and an exit surface having a light-transmitting action; and wherein at least one of said two reflecting surfaces has a curved surface configuration which gives a power to a bundle of light rays, and said curved surface configuration is a rotationally asymmetric curved surface. - View Dependent Claims (53, 54, 55, 56, 57)
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Specification