Optical system, and image observing apparatus and image pickup apparatus using it
First Claim
Patent Images
1. An optical system comprising, in an optical path between a stop and a focal plane:
- a first surface symmetric with respect to only one symmetry plane; and
a second surface symmetric with respect to only said symmetry plane,wherein said first surface is a reflective, concave surface and is inclined relative to a reference axial ray present in said symmetry plane,wherein said reference axial ray is one of (i) a ray which emerges from a center of the stop and is perpendicularly incident on a center of the focal plane and (ii) a ray which emerges perpendicularly from the center of the focal plane and is incident on the center of the stop, andwherein said second surface is configured so that a power of a partial area of said second surface changes from positive to negative corresponding to respective locations thereof.
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Abstract
The present invention relates to an optical system apparatus, which has a first surface symmetric with respect to only one symmetry plane and a second surface symmetric with respect to only the symmetry plane, in which the first plane is a reflective, concave surface and is inclined relative to a reference axial ray present in the symmetry plane. Further, a local power of the second surface changes from a positive to a negative.
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Citations
49 Claims
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1. An optical system comprising, in an optical path between a stop and a focal plane:
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a first surface symmetric with respect to only one symmetry plane; and a second surface symmetric with respect to only said symmetry plane, wherein said first surface is a reflective, concave surface and is inclined relative to a reference axial ray present in said symmetry plane, wherein said reference axial ray is one of (i) a ray which emerges from a center of the stop and is perpendicularly incident on a center of the focal plane and (ii) a ray which emerges perpendicularly from the center of the focal plane and is incident on the center of the stop, and wherein said second surface is configured so that a power of a partial area of said second surface changes from positive to negative corresponding to respective locations thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An image observing apparatus comprising:
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image display means for displaying an image; and an optical system having a first surface and a second surface symmetric with respect to only one symmetry plane, wherein said second surface guides light from the image to said first surface, wherein said first surface is a reflective, concave surface and is inclined relative to a reference axial ray present in said symmetry plane, wherein said reference axial ray is a ray which emerges perpendicularly from a center of the image and is incident on a center of a stop, and wherein said second surface is configured so that a power of a partial area of said second surface changes from positive to negative corresponding to respective locations thereof. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An image pickup apparatus comprising:
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image pickup means for receiving light from an object; and an optical system having a first surface and a second surface symmetric with respect to only one symmetry plane, wherein said first surface guides the light from the object to said second surface, wherein said first surface is a reflective, concave surface and is inclined relative to a reference axial ray present in said symmetry plane, wherein said reference axial ray is a ray which emerges from a center of a stop and is perpendicularly incident on a center of an image plane, and wherein said second surface is configured so that a power of a partial area of said second surface changes from positive to negative corresponding to respective locations thereof. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. An optical system comprising, in an optical path between a stop and a focal plane:
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a first surface symmetric with respect to only one symmetry plane; and a second surface symmetric with respect to only said symmetry plane; wherein said first surface is a reflective, concave surface and is inclined relative to a reference axial ray present in said symmetry plane, wherein said reference axial ray is one of (i) a ray which emerges from a center of the stop and is perpendicularly incident on a center of the focal plane and (ii) a ray which emerges perpendicularly from the center of the focal plane and is incident on the center of the stop, and wherein said second surface is configured so that a local power ρ
L, where ρ
L =-2N/rL, N is a refractive index of a medium in which the light travels, and rL is the local radius of curvature at a location of said second surface, changes from positive to negative corresponding to respective locations thereof.
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48. An image observing apparatus comprising:
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image display means for displaying an image; and an optical system having a first surface and a second surface symmetric with respect to only one symmetry plane, wherein said second surface guides light from the image to said first surface, wherein said first surface is a reflective, concave surface and is inclined relative to a reference axial ray present in said symmetry plane, wherein said reference axial ray is a ray which emerges perpendicularly from a center of the image and is incident on a center of a stop, and wherein said second surface is configured so that a local power ρ
L, where ρ
L =-2N/rL, N is a refractive index of a medium in which the light travels, and rL is the local radius of curvature at a location of said second surface, changes from positive to negative corresponding to respective locations thereof.
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49. An image pickup apparatus comprising:
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image pickup means for receiving light from an object; and an optical system having a first surface and a second surface symmetric with respect to only one symmetry plane, wherein said first surface guides the light from the object to said second surface, wherein said first surface is a reflective, concave surface and is inclined relative to a reference axial ray present in said symmetry plane, wherein said reference axial ray is a ray which emerges from a center of a stop and is perpendicularly incident on a center of an image plane, and wherein said second surface is configured so that a local power ρ
L, where ρ
L =-2N/rL, N is a refractive index of a medium in which the light travels, and rL is the local radius of curvature at a location of said second surface, changes from positive to negative corresponding to respective locations thereof.
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Specification