| 摘要 |
<p>The present invention comprises: an insertion portion (2); an objective optical system (11) which is provided on a distal end portion of the insertion portion (2); an objective optical system (12) which is provided on the distal end portion; a first opening (18k) which is provided away from the optical axis center (11c) of the objective optical system (11) by a predetermined distance (a) and delivers a fluid toward the objective optical system (11); and a second opening (19k) which is provided away from the optical axis center (12c) of the objective optical system (12) by a distance (b) which is equal to the predetermined distance (a) and delivers the fluid towards the objective optical system (12) in the same direction of supply as the first opening (18k).</p> |
