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US 5,508,580 AGranted
Vibration wave driven motor
AssigneeCanon Kabushiki Kaisha
InventorsTakashi Maeno, Takayuki Tsukimoto, Jun Tamai, Yutaka Maruyama
Life of this patent
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Abstract
According to this invention, a piezo-electric element as an electro-mechanical energy conversion element is urged against a vibration member, and a vibration is excited in the vibration member by a vibration produced in the piezo-electric element. Thus, a contact member, e.g., a rotor which contacts the vibration member, and the vibration member are moved relative to each other. The rigidity of the outer side of the vibration member is larger than that of its inner side.
Claims34
A vibrating device comprising:
- a first vibrating member having a hollow portion;
- a second vibrating member having a hollow portion;
- an electro-mechanical energy conversion member having a hollow portion, and disposed between said first and second vibrating members, said conversion member being arranged for generating a flexural vibration in said first and second vibrating members in response to an applied electrical signal;
- a fastening member disposed in the hollow portions of said first and second vibrating members and said conversion member, for clamping said conversion member between said first and second vibrating members;
- and
- tapered recess means for distributing a compression stress acting on said conversion member, wherein said compression stress is substantially uniform when said conversion member is clamped between said first and second vibrating members by said fastening member.
3 more elements
A vibration driven system comprising:
- a first vibrating member having a hollow portion;
- a second vibrating member having a hollow portion;
- an electro-mechanical energy conversion member having a hollow portion, and disposed between said first and second vibrating members, said conversion member being arranged for generating a flexural vibration in said first and second vibrating members in response to an applied electrical signal;
- a fastening member disposed in the hollow portions of said first and second vibrating members and said conversion member, for clamping said conversion member between said first and second vibrating members;
- tapered recess means for distributing a compression stress acting on said conversion member, wherein said compression stress is substantially uniform when said conversion member is clamped between said first and second vibrating members by said fastening member;
- and
- contact member for contacting said first vibrating member, wherein said first vibrating means drives said contact member by frictional contact therewith when a flexural vibration is generated in said first vibrating member.
4 more elements
A vibration driven system comprising:
- a first vibrating member having a hollow portion;
- a second vibrating member having a hollow portion;
- an electro-mechanical energy conversion member having a hollow portion, and disposed between said first and second vibrating members, said conversion member being arranged for generating a flexural vibration in said first and second vibrating members in response to an applied electrical signal;
- a fastening member disposed in the hollow portions of said first and second vibrating members and said conversion member, for clamping said conversion member between said first and second vibrating members;
- stepped recess means for distributing a compression stress acting on said conversion member, wherein said compression stress is substantially uniform when said conversion member is clamped between said first and second vibrating members;
- and
- a contact member for contacting said first vibrating member, wherein said first vibrating member drives said contact member by frictional contact therewith when a flexural vibration is generated in said first vibrating member.
4 more elements
A vibrating device comprising:
- a first vibrating member having a hollow portion;
- a second vibrating member having a hollow portion;
- an electro-mechanical energy conversion member having a hollow portion, and disposed between said first and second vibrating members, said conversion member being arranged for generating a flexural vibration in said first and second vibrating members in response to an applied electrical signal;
- a fastening member disposed in the hollow portions of said first and second vibrating members and said conversion member, for clamping said conversion member between said first and second vibrating members;
- and
- compression stress distributing means, including recess formed at an inner peripheral portion of at least one of said first vibrating members and said second, vibrating members for distributing a compression stress acting on said conversion member when said conversion member is clamped between said first and second vibrating members by said fastening member.
3 more elements
A vibrating device comprising:
- a first vibrating member having a hollow portion;
- a second vibrating member having a hollow portion;
- an electro-mechanical energy conversion member having a hollow portion, and disposed between said first and second vibrating members, said conversion member being arranged for generating a flexural vibration in said first and second vibrating members in response to an applied electrical signal;
- a fastening member disposed in the hollow portions of said first and second vibrating members and said conversion member, for clamping said conversion member between said first and second vibrating members;
- and
- compression stress distributing means for distributing a compression stress acting on said conversion member, wherein said compression stress is substantially uniform when said conversion member is clamped between said first and second vibrating members by said fastening member;
- wherein said compression stress distributing means comprises a spacer member having a hollow portion and at least one recess formed in said spacer member, said spacer member being insertable between said electro-mechanical energy conversion member and one of said first and second vibrating members.
4 more elements
A vibrating device comprising:
- a first vibrating member having a hollow portion;
- a second vibrating member having a hollow portion;
- an electro-mechanical energy conversion member having a hollow portion, and disposed between said first and second vibrating members, said conversion member being arranged for generating a flexural vibration in said first and second vibrating members in response to an applied electrical signal;
- a fastening member disposed in the hollow portions of said first and second vibrating members and said conversion member, for clamping said conversion member between said first and second vibrating members;
- and
- compression stress distributing means for distributing a compression stress acting on said conversion member, wherein said compression stress is substantially uniform when said conversion member is clamped between said first and second vibrating members by said fastening member;
- wherein said electro-mechanical energy conversion member comprises at least one recess constituting said compression stress distributing means.
4 more elements
A vibrating device comprising:
- a first vibrating member having a hollow portion;
- a second vibrating member having a hollow portion;
- an electro-mechanical energy conversion member having a hollow portion, and disposed between said first and second vibrating members, said conversion member being arranged for generating a flexural vibration in said first and second vibrating members in response to an applied electrical signal;
- a fastening member disposed in the hollow portions of said first and second vibrating members and said conversion member, for clamping said conversion member between said first and second vibrating members;
- and
- stepped recess means for distributing a compression stress acting on said conversion member, wherein said compression stress is substantially uniform when said conversion member is clamped between said first and second vibrating members by said fastening member.
3 more elements
Dependencies are inferred from the claim text.