Optical low-pass filter and optical apparatus having the same
First Claim
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1. An optical low-pass filter comprising:
- a phase advancing area which advances a phase of a wavefront of an incident pencil of rays with respect to a phase of a wavefront of a center of the incident pencil of rays; and
a phase retarding area which retards the phase of the wavefront of the incident pencil of rays with respect to the phase of the wavefront of the center of the incident pencil of rays,said phase advancing area and said phase retarding area being alternately formed in a generally non-linear pattern, and in a rotational direction centered at an origin corresponding to the center of the incident pencil of rays.
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Abstract
An optical low-pass filter comprises a phase advancing area which advances a phase of a wavefront of an incident pencil of rays with respect to a phase of a wavefront of a center of the incident pencil of rays, and a phase retarding area which retards the phase of the wavefront of the incident pencil of rays with respect to the phase of the wavefront of the center of the incident pencil of rays, the phase advancing area and the phase retarding area alternately existing in the optical low-pass filter, and an optical apparatus comprises an image forming optical system, an image pickup element, and such an optical low-pass filter.
38 Citations
31 Claims
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1. An optical low-pass filter comprising:
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a phase advancing area which advances a phase of a wavefront of an incident pencil of rays with respect to a phase of a wavefront of a center of the incident pencil of rays; and a phase retarding area which retards the phase of the wavefront of the incident pencil of rays with respect to the phase of the wavefront of the center of the incident pencil of rays, said phase advancing area and said phase retarding area being alternately formed in a generally non-linear pattern, and in a rotational direction centered at an origin corresponding to the center of the incident pencil of rays. - 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)
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27. An optical low-pass filter comprising:
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an area having an optical path length longer than an optical path length of a center of said optical low-pass filter; and an area having an optical path length shorter than the optical path length of the center of said optical low-pass filter, said area having the longer optical path length and said area having the shorter optical path length being alternately formed in a generally non-linear pattern, and in a rotational direction centered at an origin corresponding to the center of the incident pencil of rays.
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28. An optical apparatus comprising:
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an image forming optical system; an image pickup element; and an optical low-pass filter, said optical low-pass filter alternately including a phase advancing area which advances a phase of a wavefront of an incident pencil of rays with respect to a phase of a wavefront of a center of the incident pencil of rays, and a phase retarding area which retards the phase of the wavefront of the incident pencil of rays with respect to the phase of the wavefront of the center of the incident pencil of rays, said phase advancing area and said phase retarding area being alternately formed in a generally non-linear pattern, and in a rotational direction centered at an origin corresponding to the center of the incident pencil of rays. - View Dependent Claims (29, 30, 31)
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Specification