| 摘要 |
PROBLEM TO BE SOLVED: To have both an excellency of the conventional small-sized AC synchronous motor drive and an excellency of the case of the stepping motor drive. SOLUTION: The opening/closing device in which a driving force by a motor is transmitted to an opening/closing member so that the opening/closing member is reciprocally rotated about a fulcrum shaft of the opening/closing member comprises a gear with a tooth-lacking-gear having a gear part 45 to which a rotational driving force of the motor is transmitted and a tooth-locking gear part 46 in which gear teeth are formed only in a predetermined region in the circumferential direction, a fulcrum shaft gear 47 rotatably moving integrally with the fulcrum shaft and being rotatably coupled with the lacking gear part 46 of the gear-with the tooth lacking gear so as to rotatably move the opening/ closing member in a predetermined direction, and a fulcrum shaft driving gear 48 being rotatably coupled with the lacking gear part 46 at a different position from the fulcrum shaft gear 47 so as to transmit the torque thereof to the fulcrum shaft gear 47 and to make fulcrum shaft gear 47 rotate in the opposite direction to the predetermined direction. |
