Patent ID: 6064519
Filing Date: 2000-05-16
Classification: G02B

Abstract:
An electrically-driven coarse and fine movement apparatus comprising:a movable member;a driving device for driving said movable member;a first operation handle;a first rotary shaft fixed to said first operation handle;a second operation handle, disposed coaxially with said first operation handle, for rotating said first rotary shaft;a rotation restricting member for restricting a rotation of said second operation handle, which is accompanied with the rotation of said first operation handle;a rotation detector for detecting a rotational quantity and a rotational direction of said first rotary shaft;a discriminating device, linked to said second operation handle, for judging whether said second operation handle is operated or not to output a judging signal; anda controlling circuit for controlling said driving device so as to provide said movable member with a coarse movement in accordance with an operation of one operation handle of said first and second operation handles and to provide said movable member with a fine movement in accordance with an operation of the other handle by judging whether the operation is a drive operation by said first operation handle or by said second operation handle on the basis of a detection signal from said rotation detector and the judging signal from said discriminating device.