Endoscopic system
AssigneeCanon U.S.A., Inc.
InventorAkira Yamamoto
Life of this patent
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Abstract
This disclosure an optical unit having a plurality of structural elements such as lens and a spacer having two or more opposing surfaces of the plurality of structural elements are bonded and secured to each other. A contact portion of the bonding portion is configured to prevent spreading of an adhesive and an adhesive reservoir is provided at the bonding portion. This disclosure further provides an apparatus having an imaging optical system configured to image a side surface in a tubular passage and an illuminating optical system that is arranged centrally within the imaging optical system.
Claims14
An apparatus comprising:
- an imaging optical system configured to image a side surface in a tubular passage comprising:
- a first optical group including an optical device, the optical device includes at least two rotationally symmetric reflecting surfaces and one transmitting surface interposed between the two rotationally symmetric reflecting surfaces,
- an illuminating optical system, comprising:
- at least one reflecting element configured to transmit illuminating light toward a portion of the side surface of the tubular passage,
- wherein the illuminating optical system is arranged centrally within the imaging optical system, and an axis of rotational symmetry of the reflecting element matches a center axis of the rotational symmetric reflecting surfaces, the illuminating light passes through the center axis of the rotational symmetric reflecting surfaces before the illuminating light is transferred by the reflecting element.
An endoscopic apparatus for analyzing at least one anatomical structure, comprising:
- an imaging optical system configured to image a side surface in a tubular passage comprising:
- a first optical group having a negative refracting power and including an optical device, the optical device includes at least two rotationally symmetric reflecting surfaces and one transmitting surface interposed between the two rotationally symmetric reflecting surfaces,
- a second optical group having a positive refracting power, and
- an imaging plane and
- an illuminating optical system comprising:
- at least one reflecting element configured to transmit illuminating light toward a portion of the side surface of the tubular passage,
- wherein the illuminating optical system is arranged centrally within the imaging optical system, and an axis of rotational symmetry of the reflecting element matches a center axis of the rotational symmetric reflecting surfaces, the illuminating light passes through the center axis of the rotational symmetric reflecting surfaces before the illuminating light is transferred by the reflecting element.
Dependencies are inferred from the claim text.