| 摘要 |
A rotary driving member at the tip end portion is rotated by a motor through a linear transmission member, and the rotation of this rotary driving member is converted into a straight-line motion to thereby enable a movable lens for making the observation distance variable to move within a predetermined range. A motor shaft and the linear transmission member are connected to each other by the shaft connecting member, whereby the linear transmission member is constructed so as to be able to move in an axial direction, and on the outer peripheral portion of the shaft connecting member, a rotating member having a protruded portion is mounted, and the rotation stopper mechanism is constituted by the rotating member and a locking pin portion. Thereby, any kink of the linear transmission member is eliminated to improve the response of driving control, and loads given to the tip end portion driving member and the linear transmission member are reduced.
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