| 摘要 |
PURPOSE:To enable length measurement in different visual field directions as well by providing an index to single or plural illuminating optical systems of an optical adapter and providing a projecting optical system which projects the index to an object side. CONSTITUTION:The projecting part of a detaining body 18 enters the depression on the inside surface of the recess provided to the optical adapter 21 for length measurement when the operator fits the recess of said recess into the small- diameter part 17 of a part 8 constituting the front end of an endoscope 1 and presses the same. The endoscope is inserted through the oral cavity, etc. from the adapter 21 side to the position facing the intended objective part in the body cavity and observes the objective part at the distance suitable for observation. The illuminating light from the illuminating lamp in a light source device is transmitted by a light guide 11 in this case. Said light passes through the projecting optical system 23 from the front end face and illuminates the range of an illuminating angle theta. The index 24 is projected to a circular shape to the object surface at the angle alpha by the system 23.
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