Ultrasonic motor
AssigneeBrother Kogyo Kabushiki Kaisha
InventorMasaki Yamaguchi
Life of this patent
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Abstract
This is an ultrasonic motor having a drive unit of low elastic modulus disposed between an ultrasonic vibrator and a mover so as to prevent noise or unnecessary vibration originating from friction on a sliding surface. Moreover, providing a drive unit of plastic and of a particular thermal conductivity enables highly efficient and stabilized motion for long hours and stable driving characteristics.
Claims20
In a linear ultrasonic motor wherein a sliding member is supported for linear motion and driven by a contacting drive unit vibrated by an ultrasonic vibrator, the improvement comprising:
- said drive unit further comprising a pair of drive elements;
- a sliding member having a first portion disposed under a first one of said pair of drive elements and a second portion disposed under a second one of said pair of drive elements;
- a spring-biased member for pushing said sliding member upward against said pair of drive elements, said spring-biased member further comprising roller bearing means for supporting longitudinal movement of said first portion and said second portion;
- and
- means for preventing side slipping of said sliding member.
In a linear ultrasonic motor wherein a sliding member is supported for linear motion and driven by a contacting drive unit vibrated by an ultrasonic vibrator, the improvement comprising:
- the drive unit further comprising a pair of drive elements disposed on opposite ends of a longitudinal ultrasonic vibrator;
- a spring-biased member disposed for pushing said sliding member upward against said pair of drive elements, said sliding member having a first portion disposed under a first one of said pair of drive elements and a second portion disposed under a second one of said pair of drive elements and said spring-biased member further comprises roller bearing means for supporting longitudinal movement of said first portion and said second portion;
- means for preventing yawing and rolling of said sling member;
- and
- means for preventing side slipping of said sliding member.
In a linear ultrasonic motor wherein a sliding member is supported for linear motion and driven by a contacting drive unit vibrated by an ultrasonic vibrator, the improvement comprising:
- said drive unit further comprising at least one drive element, and the sliding member having a portion disposed under said at least one drive element;
- a spring-biased member for pushing the sliding member upward against said at least one drive element, said spring-biased member further comprising roller bearing means for supporting longitudinal movement of said portion;
- means for preventing yawning and rolling of the sliding member;
- and
- means for preventing slide slipping of the sliding member.
Dependencies are inferred from the claim text.