Objective optical system for endoscopes
First Claim
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1. An endoscope comprising:
- an endoscope body;
a master lens unit which is fixed to a distal end of said endoscope body for forming an image of an object; and
a plurality of adaptor units each of which comprises lens components disposed on one optical axis and an aperture stop such that said adaptor units have focal lengths different from one another;
wherein said adaptor units are attachable and detachable to and from said distal end of said endoscope body,wherein a first objective optical system defined by lens components from a first adapter unit from said plurality of adaptor units and said master lens unit if said first adaptor unit is attached to an object side of said master lens unit,wherein a focal length of said first objective optical system equipped with said first adaptor unit is different from a focal length of a second objective optical system equipped with a second adaptor unit, andwherein the lens component which is disposed in the vicinity of said aperture stop of said first adaptor unit may selectively vary from the lens component which is disposed in the vicinity of said second adaptor unit.
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Abstract
An objective optical system for endoscopes comprising a plurality of lens components and an aperture stop, and configured so as to permit adjusting a distance to an object to be observed simply by exchanging a lens component disposed in the vicinity of the aperture stop with another lens component having a focal length different from that of the lens component disposed in the vicinity of the aperture stop. This objective optical system for endoscopes can have an optimum depth of field by changing a diameter of the aperture stop along with the exchange of the lens component disposed in the vicinity of the aperture stop.
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6 Claims
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1. An endoscope comprising:
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an endoscope body; a master lens unit which is fixed to a distal end of said endoscope body for forming an image of an object; and a plurality of adaptor units each of which comprises lens components disposed on one optical axis and an aperture stop such that said adaptor units have focal lengths different from one another; wherein said adaptor units are attachable and detachable to and from said distal end of said endoscope body, wherein a first objective optical system defined by lens components from a first adapter unit from said plurality of adaptor units and said master lens unit if said first adaptor unit is attached to an object side of said master lens unit, wherein a focal length of said first objective optical system equipped with said first adaptor unit is different from a focal length of a second objective optical system equipped with a second adaptor unit, and wherein the lens component which is disposed in the vicinity of said aperture stop of said first adaptor unit may selectively vary from the lens component which is disposed in the vicinity of said second adaptor unit. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification