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, and a third surface, said first surface, second surface and third surface facing each other across a medium having a refractive index (n) larger than 1 (n>
- 1), so that light rays from an object side of said prism member enter said prism member by passing through said first surface and are reflected by said second surface and further reflected by said third surface, and the reflected light rays exit from said prism member by passing through said second surface,wherein both said second surface and said third surface are curved surface configurations, and at least one of the curved surface configurations is formed from a rotationally asymmetric curved surface.
1 Assignment
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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.
52 Citations
47 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, and a third surface, said first surface, second surface and third surface facing each other across a medium having a refractive index (n) larger than 1 (n> - 1), so that light rays from an object side of said prism member enter said prism member by passing through said first surface and are reflected by said second surface and further reflected by said third surface, and the reflected light rays exit from said prism member by passing through said second surface,
wherein both said second surface and said third surface are curved surface configurations, and at least one of the curved surface configurations is 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)
- 1), so that light rays from an object side of said prism member enter said prism member by passing through said first surface and are reflected by said second surface and further reflected by said third surface, and the reflected light rays exit from said prism member by passing through said second surface,
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25. 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, and a third surface, said first surface, second surface and third surface facing each other across a medium having a refractive index (n) larger than 1 (n> - 1), so that light rays from said image enter said prism member by passing through said second surface and are reflected by said third surface and further reflected by said second surface, and the reflected light rays exit from said prism member by passing through said first surface,
wherein both said second surface and said third surface are curved surface configurations, and at least one of the curved surface configurations is formed from a rotationally asymmetric curved surface. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
- 1), so that light rays from said image enter said prism member by passing through said second surface and are reflected by said third surface and further reflected by said second surface, and the reflected light rays exit from said prism member by passing through said first surface,
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44. In a finder optical system comprising an objective optical system for forming an object image;
- an image erecting optical system for erecting said object image; and
an ocular optical system for observing said object image;the improvement which comprises at least one prism member, wherein said prism member has a first surface disposed on a pupil side of said prism member and having a transmitting action;
a second surface disposed on an image side of said prism member and having both a transmitting action and a reflecting action; and
a third surface having a reflecting action,wherein both said second surface and said third surface are curved surface configurations, and at least one of the curved surface configurations is formed from a rotationally asymmetric curved surface. - View Dependent Claims (45, 46, 47)
- an image erecting optical system for erecting said object image; and
Specification