Optical apparatus and image pickup apparatus
AssigneeCanon Kabushiki Kaisha
InventorYutaka Yamaguchi
Life of this patent
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Abstract
An optical apparatus is configured to introduce light from an object to an image pickup element, and includes first, second, and third retardation plates, a polarizer, and a setter. The first retardation plate, the second retardation plate, and the polarizer are arranged in this order from a side of the object to a side of the image pickup element. The slow axis direction or the fast axis direction of the second retardation plate tilts to the slow axis direction or the fast axis direction of the first retardation plate. The setter sets the retardation of the second retardation plate according to the polarization component of the light from the object.
Claims20
An optical apparatus configured to introduce light from an object to an image pickup element, the optical apparatus comprising:
- a first retardation plate configured to provide a retardation of π/2 between a polarization component in a slow axis direction and a polarization component in a fast axis direction;
- a second retardation plate configured to change a retardation to be provided between a polarization component in a slow axis direction and a polarization component in a fast axis direction;
- a third retardation plate configured to provide a retardation of π/2 between a polarization component in a slow axis direction and a polarization component in a fast axis direction;
- a polarizer configured to extract a polarization component to be introduced to the image pickup element;
- and
- a setter configured to set the retardation of the second retardation plate,
- wherein the first retardation plate, the second retardation plate, and the polarizer are arranged in this order from a side of the object to a side of the image pickup element,
- wherein the slow axis direction or the fast axis direction of the second retardation plate tilts to the slow axis direction or the fast axis direction of the first retardation plate, and
- wherein the setter sets the retardation of the second retardation plate according to the polarization component of the light from the object.
An image pickup apparatus comprising:
- an image pickup element configured to receive light from an object;
- a first retardation plate configured to provide a retardation of π/2 between a polarization component in a slow axis direction and a polarization component in a fast axis direction;
- a second retardation plate configured to change a retardation to be provided between a polarization component in a slow axis direction and a polarization component in a fast axis direction;
- a third retardation plate configured to provide a retardation of π/2 between a polarization component in a slow axis direction and a polarization component in a fast axis direction;
- a polarizer configured to extract a polarization component to be introduced to the image pickup element;
- and
- a setter configured to set the retardation of the second retardation plate,
- wherein the first retardation plate, the second retardation plate, and the polarizer are arranged in this order from a side of the object to a side of the image pickup element,
- wherein the slow axis direction or the fast axis direction of the second retardation plate tilts to the slow axis direction or the fast axis direction of the first retardation plate, and
- wherein the setter sets the retardation of the second retardation plate according to the polarization component of the light from the object.
Dependencies are inferred from the claim text.