| 摘要 |
<p>This apparatus improves transmission efficiency of a rotational driving force of a linear transmission member, and is capable of maintaining a magnification changing operation or the like constant even though there may be a change in posture of an endoscope insertion unit. In the endoscope configured so as to drive a tip end portion movable lens (131A) for making the observation distance variable by the linear transmission member (37) and to rotate this linear transmission member (37) by a motor (27), a shaft of the motor is connected to a shaft connecting member (31), and a sliding guide hole (34) having a predetermined length is formed on a cylindrical member wall of this shaft connecting member (31). And, within this shaft connecting member (31), a distal member (38) of the linear transmission member (37) is movably disposed, and this distal member (38) is provided with a pin (40) engaging with the sliding guide hole (34). This apparatus advances and retreats the linear transmission member (37) in the rotating shaft direction during the bending operation, and provides a constant load to a motor rotating shaft (30), making it possible to obtain a stable magnification changing operation. In addition, an outside diameter of the linear transmission member (37) is formed to be smaller than a soft portion (103C) within an angle portion (103B) to reduce a frictional resistance during rotation. <IMAGE></p> |
