A wristwatch with an oscillation alarm uses an ultrasonic motor as its drive source. A vibration member has a piezoelectric element adhered thereto on one side and comb-like projections on the other side. A rotor has a sliding member composed of resin at its contacting portion with the comb-like projections and an eccentric weight at its outer circumferential portion. Shock absorbers are sandwiched between the weight and the rotor to absorb shocks applied to the rotor and thus prevent rotor damage. In the vicinity of the upper or lower side of the weight, there is disposed an abutment portion made of rigid material, the abutment portion abutting with the weight when shocks of large magnitude are applied to the rotor to assist the shock absorbers in preventing damage to the rotor.
A high reliable multi-function analog electronic timepiece which has plurality of ultrasonic motors, or has an ultrasonic motor and a motor. A first ultrasonic motor is provided as a driving source for driving a time indicating mechanism. The control circuit controls supplying timing of driving pulses of the first ultrasonic motor for driving a time indicating mechanism and driving pulses of the second ultrasonic motor for driving the calendar indicating mechanism. The control circuit inputs a driving pulse command signal to a piezoelectric vibrator driving circuit for providing driving pulses whose generating timing is controlled to the first ultrasonic motor. The calendar indicating mechanism and the time indicating mechanism are operated by the operation of the second ultrasonic motor and the first ultrasonic motor.
A timepiece comprising a display (2) such as a data display and a driving motor (M1, M2) for driving the display is characterized in that the driving motor comprises a piezo-electric motor directly engaging the display.
A watch with a dumb alarm has a time drive region which is electrically drivable and an alarm drive region which is drivable by a mechanical drive source. The alarm drive region has an alarm wheel engaging the hour wheel, an eccentric weight rotatably supported in an eccentric position, an alarm lever for urging the hour wheel toward the alarm wheel, the alarm lever having a distal end engageable with an engaging portion on the eccentric weight, an externally operable member for controlling the eccentric weight to start and stop operating, a spiral spring for rotating the eccentric weight, and a wheel train for transmitting drive forces from the spiral spring. When a preset time to be announced comes, the hour wheel engages the alarm wheel to allow the eccentric weight to start operating, and power of the spiral spring is transmitted through the wheel train to the eccentric weight to rotate the eccentric weight to produce vibrations thereof.
A linear motion mechanism comprises a supersonic motor having a rotor which is rotationally driven by vibration of a vibrating body having a piezoelectric element. A transmission mechanism is disposed on the rotor for rotation therewith. A moving body undergoes linear movement in a direction crosswise to a longitudinal axis of a rotational shaft of the rotor in accordance with rotation of the transmission mechanism. A pressurizing mechanism presses the moving body into pressure contact with the transmission mechanism.
A vibration driven motor including a vibration member for generating a vibration therein as a driving force, and a contact member in press contact with the vibration member, wherein a vibration generated in the vibration member causes relative movement between the vibration member and the contact member. The vibration member includes an elastic contact portion, and the contact member includes an elastic contact portion in contact with the contact portion of the vibration member.
