Patent ID: 7959561

Claim:
An endoscope system comprising: a rigid endoscope including an observation optical system and an illumination optical system in a rigid insert section thereof; and a wiper sheath, the wiper sheath including a wiper insert section receiving the insert section of the rigid endoscope, a wiper arranged on a distal end of the wiper insert section and enabled to be placed in contact with a distal-end face of the rigid endoscope received in the wiper insert section, and an operation unit, arranged at a proximal end portion of the wiper insert section, for switching the wiper between a contact state with the wiper placed to be in contact with the distal-end face of the rigid endoscope and a detached state with the wiper spaced apart from the distal-end face of the rigid endoscope, and for moving the wiper on and along the distal-end face of the rigid endoscope when the wiper is in the contact state; wherein the operation unit comprises: a tubular body secured to the outer circumference of the wiper insert section and having a first cam groove with which a pin is engaged; a wiper tube rotatably and longitudinally movably supported around the outer circumference of the tubular body and having one end portion on which the pin to be engaged with the first cam groove is attached; a first rotary ring rotatably supported around the outer circumference of the tubular body and forming an outer housing of the operation unit; and a second rotary ring with an extension portion having a second cam groove with which the other end portion of the pin attached to the wiper tube is engaged, the second rotary ring rotatably supported around the outer circumference of the tubular body, and integrally formed with the first rotary ring.