| 摘要 |
An endoscope with an objective lens drive mechanism for an objective lens system which is mounted within a rigid tip end section of an insertion instrument of the endoscope. The objective lens system includes a fixed lens which is mounted on a fixed lens frame, and at least one movable lens which is mounted on a movable lens frame. The movable lens frame is slidable along guide surfaces which are provided on the inner periphery of the fixed lens frame in the direction of optical axis of the lens system. A nut portion, which is projected from the movable lens frame substantially in a direction perpendicular to the optical axis, is held in threaded engagement with a screw rod member which is rotatably supported on a bearing member which is in turn supported on the fixed lens frame. The screw rod member is rotatable but blocked against movements in the axial direction. Further, the screw rod is connected with a flexible transmission shaft which is sheathed in a sleeve to transmit rotation to the screw rod. A control cable of the objective lens drive is constituted by the flexible transmission shaft and the sleeve.
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