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US 5,706,136 AGranted
Optical system, and image observing apparatus and image pickup apparatus using it
AssigneeCanon Kabushiki Kaisha
InventorsAtsushi Okuyama, Shoichi Yamazaki
Life of this patent
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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.
Claims49
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, 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.
3 more elements
An image observing apparatus comprising:
- 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.
4 more elements
An image pickup apparatus comprising:
- 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.
4 more elements
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, and
- wherein said second surface is configured so that a local power .rho..sub.L, where .rho..sub.L =-2N/r.sub.L, N is a refractive index of a medium in which the light travels, and r.sub.L is the local radius of curvature at a location of said second surface, changes from positive to negative corresponding to respective locations thereof.
3 more elements
An image observing apparatus comprising:
- 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 .rho..sub.L, where .rho..sub.L =-2N/r.sub.L, N is a refractive index of a medium in which the light travels, and r.sub.L is the local radius of curvature at a location of said second surface, changes from positive to negative corresponding to respective locations thereof.
4 more elements
An image pickup apparatus comprising:
- 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 .rho..sub.L, where .rho..sub.L =-2N/r.sub.L, N is a refractive index of a medium in which the light travels, and r.sub.L is the local radius of curvature at a location of said second surface, changes from positive to negative corresponding to respective locations thereof.
4 more elements
Dependencies are inferred from the claim text.