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US 10,591,743 B2Granted
Image pickup optical system and image pickup apparatus
AssigneeCanon Kabushiki Kaisha
InventorsYoshiaki Ida, Kazuhiko Momoki
Life of this patent
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Abstract
An image pickup optical system includes an aperture stop, a first apodization filter disposed on an object side of the aperture stop, and a second apodization filter disposed on an image plane side of the aperture stop, each of the first apodization filter and the second apodization filter satisfies a predetermined condition, and a meridional light beam of a maximum angle of view has an optical path not involving at least one of a point of intersection between the optical axis and the first apodization filter and a point of intersection between the optical axis and the second apodization filter when an aperture size of the aperture stop is maximum.
Claims17
An image pickup optical system comprising:
- an aperture stop;
- a first apodization filter disposed on an object side of the aperture stop;
- and
- a second apodization filter disposed on an image plane side of the aperture stop,
- wherein each of the first apodization filter and the second apodization filter satisfies the following conditional expression:
- T(r1)≥T(r2)
- where r1 and r2 (r1<r2) are distances from an optical axis in a radial direction orthogonal to the optical axis, T(r1) and T(r2) are transmittances at positions apart from the optical axis by the distances of r1 and r2,
- wherein a transmittance of the first apodization filter is smaller in a periphery of the first apodization filter than in a center part of the first apodization filter,
- wherein a transmittance of the second apodization filter is smaller in a periphery of the second apodization filter than in a center part of the second apodization filter,
- wherein when an aperture size of the aperture stop is maximum, a width of an entire meridional light beam of a maximum angle of view at the aperture stop is narrower than a width of an entire on-axis light beam at the aperture stop, and
- wherein when the aperture size of the aperture stop is maximum, at least one of (a) a region where the entire meridional light beam of a maximum angle of view is incident on the first apodization filter or (b) a region where the entire meridional light beam of a maximum angle of view is incident on the second apodization filter includes at least a part of a region where the entire on-axis light beam is incident but does not include a point on the optical axis.
8 more elements
An image pickup system comprising:
- an image pickup optical system;
- and
- an image sensor configured to photoelectrically convert an optical image formed via the image pickup optical system and to output image data,
- wherein the image pickup optical system includes:
- an aperture stop;
- a first apodization filter disposed on an object side of the aperture stop;
- and
- a second apodization filter disposed on an image plane side of the aperture stop,
- wherein each of the first apodization filter and the second apodization filter satisfies the following conditional expression:
- T(r1)≥T(r2)
- where r1 and r2 (r1<r2) are distances from an optical axis in a radial direction orthogonal to the optical axis, T(r1) and T(r2) are transmittances at positions apart from the optical axis by the distances of r1 and r2,
- wherein a transmittance of the first apodization filter is smaller in a periphery of the first apodization filter than in a center part of the first apodization filter,
- wherein a transmittance of the second apodization filter is smaller in a periphery of the second apodization filter than in a center part of the second apodization filter,
- wherein when an aperture size of the aperture stop is maximum, a width of an entire meridional light beam of a maximum angle of view at the aperture stop is narrower than a width of an entire on-axis light beam at the aperture stop, and
- wherein when the aperture size of the aperture stop is maximum, at least one of (a) a region where the entire meridional light beam of a maximum angle of view is incident on the first apodization filter or (b) a region where the entire meridional light beam of a maximum angle of view is incident on the second apodization filter includes at least a part of a region where the entire on-axis light beam is incident but does not include a point on the optical axis.
12 more elements
Dependencies are inferred from the claim text.