Endoscope optical system and image pickup apparatus
First Claim
1. An endoscope optical system comprising:
- an objective optical system for forming an object image, said objective optical system including a prism member having at least a reflecting surface for bending an optical path; and
an image transfer system for leading the object image formed by said objective optical system to an observation apparatus along a direction of a major axis,wherein said objective optical system has a configuration that produces decentration aberration by bending the optical path; and
wherein said prism member has at least one curved surface having an optical action in the optical path, said curved surface having no axis of rotational symmetry intersecting a surface of an area thereof where light is transmitted or reflected, said curved surface correcting said decentration aberration.
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Abstract
A compact endoscope optical system capable of providing a clear image of minimal distortion even at a wide field angle. The endoscope optical system includes an objective optical system for forming an object image. The objective optical system has a prism member (3) having reflecting surfaces (5, 6) for bending an optical path. The endoscope optical system further includes an image transfer system for leading the object image formed by the objective optical system to an observation apparatus along the direction of a major axis. The objective optical system has a configuration producing decentration aberration by bending the optical path. The prism member (3) has at least one curved surface (4 to 7) having an optical action in the optical path. The curved surface is such a non-rotationally symmetric surface having no axis of rotational symmetry in nor out of the surface as to correct the decentration aberration.
273 Citations
24 Claims
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1. An endoscope optical system comprising:
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an objective optical system for forming an object image, said objective optical system including a prism member having at least a reflecting surface for bending an optical path; and an image transfer system for leading the object image formed by said objective optical system to an observation apparatus along a direction of a major axis, wherein said objective optical system has a configuration that produces decentration aberration by bending the optical path; and wherein said prism member has at least one curved surface having an optical action in the optical path, said curved surface having no axis of rotational symmetry intersecting a surface of an area thereof where light is transmitted or reflected, said curved surface correcting said decentration aberration. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 19)
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2. An endoscope optical system comprising:
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an objective optical system for forming an object image, said objective optical system including a prism member having at least a reflecting surface for bending an optical path; and an image transfer system for leading the object image formed by said objective optical system to an observation apparatus along a direction of a major axis; wherein said reflecting surface of said prism member has a surface configuration that produces decentration aberration; and wherein at least one of said reflecting surface and another reflecting surface of said prism member is a has no axis of rotational symmetry intersecting a surface of an area thereof where light is transmitted or reflected, said curved surface correcting said decentration aberration.
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14. An image pickup apparatus, comprising:
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an image-forming optical system which forms an object image; an image pickup device which receives the object image formed by said image-forming optical system; and a monitor which converts the image received by said image pickup device into an electric signal and displays an image from the electric signal; wherein said image-forming optical system has a prism optical system in which at least one surface which transmits and/or reflects light from an object is formed from a curved surface, wherein said curved surface of said prism optical system is a non-rotationally symmetric surface, wherein said prism optical system has a prism formed from at least two curved surfaces, wherein said at least two curved surfaces include a first reflecting surface disposed at a tilt to face an object point, and a second reflecting surface tilted with respect to both said first reflecting surface and an image plane, at least one of said first and second reflecting surfaces being a non-rotationally symmetric surface having no axis of rotational symmetry, and wherein said prism optical system is arranged such that light rays from the object point travel along an optical axis and are reflected by said reflecting surface of said prism optical system toward a side opposite to the image plane with respect to the optical axis and then reflected by said second reflecting surface to reach the image plane by substantially intersecting said optical axis. - View Dependent Claims (16, 17, 18, 20, 21, 22, 23, 24)
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15. An image pickup apparatus, comprising:
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an image-forming optical system which forms an object image; an image pickup device which receives the object image formed by said image-forming optical system; and a monitor which converts the image received by said image pickup device into an electric signal and displays an image from the electric signal; wherein said image-forming optical system has a prism optical system in which at least one surface which transmits and/or reflects light from an object is formed from a curved surface, wherein said curved surface of said prism optical system is a non-rotationally symmetric surface, wherein said prism optical system has a prism formed from at least two curved surfaces, wherein said at least two curved surfaces include a first reflecting surface disposed at a tilt to face an object point, and a second reflecting surface tilted with respect to both said first reflecting surface and an image plane, at least one of said first and second reflecting surfaces being a non-rotationally symmetric surface having no axis of rotational symmetry; and wherein said prism optical system is arranged such that light rays from the object point travel along an optical axis and are reflected by said first reflecting surface of said prism optical system toward the image plane with respect to the optical axis and then reflected by said second reflecting surface to reach the image plane without intersecting said optical axis.
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Specification