Optical system for endoscopes
First Claim
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1. An optical system comprising:
- a stop means having a variable aperture and a lens system;
wherein said optical system produces aberrations which are controlled so as to prevent an image surface thereof from shifting from the object side to the image side by narrowing the aperture of said stop means.
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Abstract
An optical system for endoscopes which comprises a stop having a variable aperture and is configured so as to produce spherical aberration for preventing an image surface thereof from being shifted in a direction opposite to the object side by narrowing the aperture of the stop, whereby the optical system is free from insufficiency in brightness and degradation in resolution thereof on a side farther from the optical system within a depth of field thereof, and has another side of the depth of field brought close to the optical system.
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Citations
24 Claims
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1. An optical system comprising:
- a stop means having a variable aperture and a lens system;
wherein said optical system produces aberrations which are controlled so as to prevent an image surface thereof from shifting from the object side to the image side by narrowing the aperture of said stop means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 20, 21)
- a stop means having a variable aperture and a lens system;
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9. An endoscope apparatus comprising:
- an illuminating means for irradiating an object and an optical system for forming an image of an object onto solid-state image pickup devices;
wherein a stop means having a variable aperture is disposed in said optical system, wherein said optical system produces aberrations and wherein said aberrations are controlled so as to prevent a best image surface due to said aberrations from being shifted from the image side to the object side by narrowing the aperture of said stop means. - View Dependent Claims (11)
- an illuminating means for irradiating an object and an optical system for forming an image of an object onto solid-state image pickup devices;
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12. An optical system comprising:
- a stop means having an aperture variable in a shape or a size thereof and a lens system;
wherein an optical element producing positive spherical aberration is disposed at a location of a pupil of said optical system or a location conjugate with the pupil of said optical system or in the vicinity thereof. - View Dependent Claims (13, 14, 15, 22, 23)
- a stop means having an aperture variable in a shape or a size thereof and a lens system;
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16. An optical system for endoscopes comprising:
- a non-flexible endoscope comprising a relay lens system for transmitting an image of an object, and an imaging optical system for imaging an image transmitted by said relay lens system;
wherein a stop means having an aperture variable in a shape or a size thereof is disposed in an optical path of said optical system, and wherein an optical element producing positive spherical aberration is disposed at a location of a pupil of said optical system or at a location conjugate with the pupil of said optical system or in the vicinity thereof. - View Dependent Claims (17, 18, 19, 24)
- a non-flexible endoscope comprising a relay lens system for transmitting an image of an object, and an imaging optical system for imaging an image transmitted by said relay lens system;
Specification