Patent ID: 6920803

Claim:
An electromotive stage for a microscope, comprising: a stationary member adapted to be fixed to the microscope; a movable member which holds a sample and which is movable in a direction perpendicular to an optical axis of the microscope; a stepping motor which moves the movable member; a power transmitter which transmits a rotation of the stepping motor to the movable member; an origin detector which detects whether the movable member is positioned at an origin; a control unit which controls a position of the movable member based on a signal from the origin detector and a number of driving pulses of the stepping motor; a reducer which reduces a speed of the transmitted rotation of the stepping motor and includes at least one spur gear, and which is fixed to the stationary member such that the power transmitter is provided with the reducer; a pulley attached to an output shaft of the reducer; a wire rope which is wound around the pulley such that opposite ends of the wire rope are attached to the movable member; and an urging unit which applies a rotation force to the spur gear in one direction in a movement range of the movable member; wherein the power transmitter is provided with the urging unit; and wherein the urging unit includes a spiral spring which is disposed between the output shaft of the reducer and the stationary member and which applies an urging force to the output shaft of the reducer.