Concentric optical system
First Claim
1. A concentric optical system comprising:
- at least two semitransparent reflecting surfaces each having a center of curvature disposed in the vicinity of a pupil and a concave surface directed toward the pupil,said semitransparent reflecting surfaces being disposed so that each semitransparent reflecting surface passes each particular bundle of light rays at least once and reflects said bundle of light rays at least once,wherein the concentric optical system satisfies the following condition;
space="preserve" listing-type="equation">0.5<
|R.sub.1 /R.sub.2 |<
1.8 (2)where R1 is the radius of curvature of the semitransparent reflecting surface closer to said pupil, and R2 is the radius of curvature of the other semitransparent reflecting surface.
1 Assignment
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Accused Products
Abstract
A concentric optical system usable as either an imaging optical system or an ocular optical system, which has an F-number of 1.5 to 3 and enables a flat and clear image to be photographed or observed at a view angle of up to 60° or more with substantially no aberration. The concentric optical system includes at least two semitransparent reflecting surfaces (2) and (3) each having a center of curvature disposed in the vicinity of a pupil (1) and a concave surface directed toward the pupil. The semitransparent reflecting surfaces are disposed so that each semitransparent reflecting surface passes each particular bundle of light rays at least once and reflects them at least once, thereby providing a flat image surface (4).
116 Citations
6 Claims
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1. A concentric optical system comprising:
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at least two semitransparent reflecting surfaces each having a center of curvature disposed in the vicinity of a pupil and a concave surface directed toward the pupil, said semitransparent reflecting surfaces being disposed so that each semitransparent reflecting surface passes each particular bundle of light rays at least once and reflects said bundle of light rays at least once, wherein the concentric optical system satisfies the following condition;
space="preserve" listing-type="equation">0.5<
|R.sub.1 /R.sub.2 |<
1.8 (2)where R1 is the radius of curvature of the semitransparent reflecting surface closer to said pupil, and R2 is the radius of curvature of the other semitransparent reflecting surface. - View Dependent Claims (6)
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2. A concentric optical system comprising:
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at least two semitransparent reflecting surfaces each having a center of curvature disposed in the vicinity of a pupil and a concave surface directed toward the pupil, said semitransparent reflecting surfaces being disposed so that each semitransparent reflecting surface passes each particular bundle of light rays at least once and reflects said bundle of light rays at least once, wherein the concentric optical system satisfies the following condition;
space="preserve" listing-type="equation">0.4<
|(D.sub.1 +D.sub.2)/R.sub.2 |<
1.7 (3)where R2 is the radius of curvature of the semitransparent reflecting surface farther from said pupil, D1 is the distance from said pupil to the semitransparent reflecting surface closer to said pupil, and D2 is the distance from the semitransparent reflecting surface closer to said pupil to the other semitransparent reflecting surface.
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3. A concentric optical system comprising:
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at least two semitransparent reflecting surfaces each having a center of curvature disposed in the vicinity of a pupil and a concave surface directed toward the pupil, said semitransparent reflecting surfaces being disposed so that each semitransparent reflecting surface passes each particular bundle of light rays at least once and reflects said bundle of light rays at least once, wherein the concentric optical system satisfies the following condition;
space="preserve" listing-type="equation"><
| (|R.sub.1 |+D.sub.2)/R.sub.2 |<
1.8 (4)where R1 is the radius of curvature of the semitransparent reflecting surface closer to said pupil, R2 is the radius of curvature of the other semitransparent reflecting surface, and D2 is the distance from the semitransparent reflecting surface closer to said pupil to the other semitransparent reflecting surface. - View Dependent Claims (5)
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4. A concentric optical system comprising:
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at least two semitransparent reflecting surfaces each having a center of curvature disposed in the vicinity of a pupil and a concave surface directed toward the pupil, said semitransparent reflecting surfaces being disposed so that each semitransparent reflecting surface passes each particular bundle of light rays at least once and reflects said bundle of light rays at least once, wherein the concentric Optical system satisfies the following condition;
space="preserve" listing-type="equation">|D.sub.1 /R.sub.1 |<
1.5 (5)where R1 is the radius of curvature of the semitransparent reflecting surface closer to said pupil, and D1 is the distance from said pupil to the semitransparent reflecting surface closer to said pupil.
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Specification