DRIVE MECHANISM AND DRIVE DEVICE
First Claim
1. A drive mechanism, comprising:
- a fixed portion;
a driven body; and
a shape memory alloy actuator which applies a driving force to the driven body to drive the driven body in a first axis direction,whereinthe driven body and the fixed portion are connected to each other via a viscoelastic member.
1 Assignment
0 Petitions
Accused Products
Abstract
A drive mechanism and a drive device each comprise a driven body (1), a displacement member (2), and an SMA actuator (3) for giving a displacement force. The driven body (1) is coupled to a fixed section through a viscoelastic member (11 (11A, 11B, 11C, 11D)). A displacement output section is engaged with the driven body, and thereby a predetermined portion of the displacement member (2) for displacing the driven body in a first-axis direction is connected to the fixed section through the viscoelastic member (11 (11E, 11F, 11G, 11H)). A shape-memory alloy (SMA) actuator is used. The position of the driven body is stably and quickly controlled. Even if a shock force is exerted or even if the drive mechanism and the drive device are left in a high-temperature environment for a long time, the SMA, the drive mechanism, and the drive device do not deteriorate, the sizes and weights thereof can be reduced, and they can be easily assembled.
47 Citations
22 Claims
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1. A drive mechanism, comprising:
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a fixed portion; a driven body; and a shape memory alloy actuator which applies a driving force to the driven body to drive the driven body in a first axis direction, wherein the driven body and the fixed portion are connected to each other via a viscoelastic member. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A drive mechanism, comprising:
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a fixed portion; a driven body; a support member which supports the driven body so as to be movable in a first axis direction with respect to the fixed portion; a shape memory alloy actuator; and a displacement member which transmits a driving force of the shape memory alloy actuator to the driven body, wherein a predetermined portion of the displacement member and the fixed portion are connected to each other via a viscoelastic member. - View Dependent Claims (8, 9, 10, 11)
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12. A drive device, comprising:
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a fixed portion provided with a base member having a through hole portion; and a driven body supported via a support member fitted to the base member such that the driven body is movable in reciprocation in the through hole portion along a direction of an axis of the driven body, a driving force for achieving the reciprocation being obtained via a shape memory alloy wire fitted to the base member, wherein the driven body is moved via a lever member which amplifies a displacement amount of the shape memory alloy wire; wherein the lever member is formed to have; a drive arm which is engaged with an engagement projection portion provided in the driven body at each of two external sides of the driven body opposite to each other with an axis line of the driven body therebetween, the drive arm moving the driven body in a direction of an axis line of the driven body; a pivotally-supporting portion which swingably supports the drive arm; and an extending arm provided to extend downward from the pivotally-supporting portion so as to be bent with respect to the drive arm; wherein a support leg is provided in the base member to support the pivotally-supporting portion, and the drive arm is made to swing via the extending arm by contraction of the shape memory alloy wire suspended from a suspension portion provided at an end side of the extending arm; and wherein the driven body and the fixed portion are connected to each other via a viscoelastic member placed on an area of the movable driven body on the direction of the axis line of the driven body, the area at least including the engagement projection portion. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A drive device, comprising:
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a fixed portion provided with a base member having a through hole portion; and a driven body supported, via a support member fitted to the base member, to be movable in reciprocation in the through hole portion in a direction of an axis line of the driven body, a driving force for the reciprocation being obtained via a shape memory alloy wire fitted to the base member, wherein the driven body is made to move via a lever member which amplifies a displacement amount of the shape memory alloy wire; wherein the lever member is provided with; a drive arm which is engaged with an engagement projection portion provided in the driven body at each of two external sides of the driven body opposite to each other with an axis line of the driven body therebetween, the drive arm moving the driven body in the direction of the axis line of the driven body; a pivotally-supporting portion which swingably supports the drive arm; and an extending arm provided to extend downward from the pivotally-supporting portion so as to be bent with respect to the drive arm; wherein a support leg is provided in the base member to support the pivotally-supporting portion, and the drive arm is made to swing, via the extending arm, by contraction of the shape memory alloy wire suspended from a suspension portion provided at an end side of the extending arm; and wherein at least one of the displacement input portion, the pivotally-supporting portion, and the displacement output portion of the lever member is connected to the fixed portion via a viscoelastic member. - View Dependent Claims (19, 20, 21, 22)
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Specification