阅读说明：本技术 致动器 (Actuator ) 是由 北原裕士 武田正 土桥将生 于 2018-06-11 设计创作，主要内容包括：本发明提供一种致动器1A,在支承体2和可动体3在第一方向Z上对置的部位配置有粘弹性部件9,磁驱动电路6在与第一方向Z交叉的第二方向X上驱动可动体3。另外,粘弹性部件9在以第一方向Z为厚度方向并沿第二方向X延伸的状态下,将在第一方向Z上对置的可动体3和支承体2连接。因此,能够通过粘弹性部件9抑制使可动体3振动时的共振。另外,通过使用粘弹性部件9的剪切方向上的弹簧要素,能够提高振动加速度对于输入信号的再现性,能够实现具有细微的差别的振动。另外,能够抑制粘弹性部件9沿厚度方向被按压而大幅变形,能够抑制可动体3和支承体2的间隙大幅变化。(An actuator 1A is provided with a viscoelastic member 9 disposed at a position where a support 2 and a movable body 3 face each other in a first direction Z, and a magnetic drive circuit 6 drives the movable body 3 in a second direction X intersecting the first direction Z. The viscoelastic member 9 connects the movable body 3 and the support 2 facing each other in the first direction Z with each other in a state of extending in the second direction X with the first direction Z as a thickness direction. Therefore, resonance when the movable body 3 is vibrated can be suppressed by the viscoelastic member 9. Further, by using the spring element in the shearing direction of the viscoelastic member 9, the reproducibility of the vibration acceleration with respect to the input signal can be improved, and vibration having a fine difference can be realized. Further, it is possible to suppress the viscoelastic member 9 from being pressed in the thickness direction and greatly deformed, and to suppress a large change in the gap between the movable body 3 and the support body 2.)

1. An actuator, comprising:

a support;

a movable body movably supported by the support body;

a magnetic drive circuit includes: a coil and a magnet facing the coil in a first direction, the magnet relatively moving the movable body with respect to the support in a second direction intersecting the first direction; and

a viscoelastic member disposed at a position where the support body and the movable body face each other in the first direction,

wherein the viscoelastic member is disposed with the first direction as a thickness direction, and deforms in a shear direction when the movable body moves in the second direction with respect to the support.

2. The actuator of claim 1,

the coil is a flat coil in which the first direction is a thickness direction,

the magnet is a flat plate-shaped magnet having the first direction as a thickness direction,

the viscoelastic member extends in a direction orthogonal to the first direction.

3. Actuator according to claim 1 or 2,

the support body is provided with: a first cover member disposed on one side of the movable body in the first direction, and a second cover member disposed on the other side of the movable body in the first direction,

the viscoelastic member is disposed: the movable body and the first cover member, and the movable body and the second cover member.

4. Actuator according to claim 1 or 2,

the movable body is provided with: a plurality of yokes overlapping when viewed from the first direction, and a connecting member that positions and connects the plurality of yokes in the first direction,

the support body is provided with: a first cover member disposed on one side of the plurality of yokes in the first direction, and a second cover member disposed on the other side of the plurality of yokes in the first direction,

the viscoelastic member is disposed: the first cover member and the second cover member are connected to each other by the connecting member, and the second cover member and the first cover member are connected to each other by the connecting member.

5. Actuator according to claim 1 or 2,

the support body is provided with: a holder that holds the coil or the magnet,

the viscoelastic member is disposed at a position where the holder and the movable body face each other in the first direction.

6. An actuator according to any of claims 1 to 5,

the viscoelastic member is arranged in a state of being compressed in the first direction.

7. An actuator according to any of claims 1 to 6,

the support body is provided with a convex part,

the convex portion protrudes from a surface to which the viscoelastic member is connected toward the movable body.

8. An actuator according to any of claims 1 to 7,

the support body has a recess in a portion thereof contacting the viscoelastic member.

9. An actuator according to any of claims 1 to 8,

the viscoelastic member is a gel-like vibration damping member.

Technical Field

The present invention relates to an actuator that generates various vibrations.

Background

As a device for generating vibration by a magnetic drive mechanism, an actuator has been proposed in which a movable body is vibrated in an axial direction with respect to a support body by a magnetic drive circuit including a coil and a magnet. In such an actuator, in order to appropriately drive the movable body, a structure in which the support body and the movable body are connected by a viscoelastic member has been proposed. For example, in patent document 1, a movable body is supported to be movable in an axial direction with respect to a support (fixed body), and a silicone rubber (gel-like vibration damping member) is interposed between the support and the movable body. By using a viscoelastic member such as silicone rubber, resonance at the time of driving the movable body can be suppressed.

Disclosure of Invention

Technical problem to be solved by the invention

In the actuator of patent document 1, the magnetic drive circuit includes a magnet and a coil that are coaxially arranged. The viscoelastic member is sandwiched between the inner peripheral surface of the support body (fixed body) and the outer peripheral surface of the movable body, and is disposed so as to surround the central axis of the movable body.

On the other hand, as a configuration of an actuator that generates vibration by a magnetic drive circuit including a coil and a magnet, there has been proposed a magnetic drive circuit that uses a flat coil and a flat plate-like magnet to face each other in a first direction and vibrates a movable body in a second direction orthogonal to the first direction. Therefore, in such an actuator, it is also desired to appropriately drive the movable body by appropriately utilizing the characteristics of the viscoelastic member.

In view of the above problems, an object of the present invention is to provide an actuator capable of appropriately disposing a viscoelastic member between a support and a movable body and appropriately driving the movable body.

Technical scheme for solving problems

In order to solve the above-described problems, the present invention provides an actuator including: a support; a movable body movably supported by the support body; a magnetic drive circuit including a coil and a magnet facing the coil in a first direction, the magnetic drive circuit relatively moving the movable body with respect to the support in a second direction intersecting the first direction; and a viscoelastic member disposed at a position where the support and the movable body face each other in the first direction, the viscoelastic member being disposed with the first direction as a thickness direction, and being deformed in a shearing direction when the movable body moves in the second direction with respect to the support.

In the present invention, the viscoelastic member is disposed at a position where the support and the movable body face each other in the first direction, and the magnetic drive circuit drives the movable body in the second direction intersecting the first direction. The viscoelastic member is disposed with the first direction as a thickness direction, and deforms in a direction (shear direction) intersecting the thickness direction (axial direction) when the movable body moves in a second direction with respect to the support. Therefore, resonance when the movable body is vibrated can be suppressed by the viscoelastic member. Since the deformation in the shear direction of the viscoelastic member is a deformation in a direction in which the viscoelastic member is stretched, the viscoelastic member has a deformation characteristic in which a linear component (spring constant) is larger than a nonlinear component (spring constant). Therefore, in the viscoelastic member, the elastic force based on the movement direction is constant. Therefore, in the present invention, when the movable body is driven in the direction intersecting the first direction, the reproducibility of the vibration acceleration with respect to the input signal can be improved by using the spring element in the shearing direction of the viscoelastic member. Therefore, vibration with a slight difference can be realized.

In the present invention, the viscoelastic member has a stretching characteristic in which a nonlinear component (spring constant) is larger than a linear component (spring constant) when the movable body and the support are compressed and deformed in the thickness direction (axial direction). Therefore, in the direction orthogonal to the driving direction of the movable body, the viscoelastic member can be suppressed from being largely deformed, and therefore, the gap between the movable body and the support body can be suppressed from largely changing.

In the present invention, the following configuration may be adopted: the coil is a flat coil whose thickness direction is the first direction, the magnet is a flat plate-shaped magnet whose thickness direction is the first direction, and the viscoelastic member extends in a direction orthogonal to the first direction. In this way, since the magnetic drive circuit and the viscoelastic member are made thin in the first direction, it is possible to configure an actuator in which the dimension in the direction (first direction) orthogonal to the drive direction (second direction) is made thin.

In the present invention, the support may include: a first cover member disposed on one side of the movable body in the first direction, and a second cover member disposed on the other side of the movable body in the first direction. The viscoelastic member is disposed: the movable body and the first cover member, and the movable body and the second cover member. In this way, the viscoelastic member can be disposed so as to be deformed in the shearing direction when the movable body vibrates in the second direction. Further, the movable body can be supported evenly on both sides of the movable body in the first direction.

In the present invention, the movable body may include: a plurality of yokes overlapped as viewed from the first direction, and a connecting member that positions and connects the plurality of yokes in the first direction. The support body is provided with: the first cover member is disposed on one side of the plurality of yokes in the first direction, and the second cover member is disposed on the other side of the plurality of yokes in the first direction. The viscoelastic member is disposed: the first cover member and the second cover member are connected to each other by the connecting member, and the second cover member and the first cover member are connected to each other by the connecting member. In this way, the viscoelastic member can be disposed so as to be deformed in the shearing direction when the movable body vibrates in the second direction. In addition, the assembled body can be supported evenly on both sides in the first direction of the assembled body assembled by the plurality of yokes. Further, the plurality of yokes can be positioned within the range of the dimensional tolerance of one member (connecting member), and the component tolerances of the plurality of yokes can be prevented from being accumulated in the first direction. This can reduce variations in the gap between the assembly and the first cover member and the gap between the assembly and the second cover member. Therefore, since the viscoelastic member reliably follows the movement of the movable body, resonance of the movable body can be effectively prevented.

In the present invention, the support may include: and a holder that holds the coil or the magnet, wherein the viscoelastic member is disposed at a position where the holder and the movable body face each other in the first direction. Thus, it is not necessary to secure a gap for disposing the viscoelastic member between the movable body and the cover. Therefore, the actuator can be thinned. In addition, since the viscoelastic member can be mounted in a state before the cover is mounted, the vibration characteristics including the vibration damping performance can be inspected in a state before the cover is mounted.

In the present invention, it is preferable that the viscoelastic member is disposed in a state of being compressed in the first direction. In this way, since the viscoelastic member reliably follows the movement of the movable body, the resonance of the movable body can be effectively prevented.

In the present invention, it is preferable that the support includes a convex portion protruding toward the movable body from a surface to which the viscoelastic member is connected. In this way, the amount of indentation in the first direction of the viscoelastic member can be limited.

In the present invention, the support body may have a concave portion in a portion contacting the viscoelastic member. According to this aspect, the position of the viscoelastic member is less likely to shift.

In the present invention, the viscoelastic member may be a gel-like vibration damping member. By using the gel-like decompression member, when compressed and deformed by being pressed in the thickness direction (axial direction), the gel-like decompression member can have an expansion and contraction characteristic in which a nonlinear component (spring constant) is larger than a linear component (spring constant). On the other hand, when stretched by being stretched in the thickness direction (axial direction), the elastic member can have an expansion/contraction characteristic in which a linear component (spring constant) is larger than a nonlinear component (spring constant). On the other hand, in the case of deformation in a direction (shear direction) intersecting the thickness direction (axial direction), the deformation is in a direction in which the deformation is stretched regardless of the movement in any direction, and therefore, the deformation characteristic can be obtained in which the linear component (spring constant) is larger than the nonlinear component (spring constant).

Effects of the invention

In the present invention, the viscoelastic member is disposed at a position where the support and the movable body face each other in the first direction, and the magnetic drive circuit drives the movable body in the second direction intersecting the first direction. The viscoelastic member extends in the second direction with the first direction as a thickness direction, and deforms in a direction (shear direction) intersecting the thickness direction (axial direction) when the movable body moves in the second direction with respect to the support. Therefore, resonance when the movable body is vibrated can be suppressed by the viscoelastic member. Further, the deformation in the shearing direction of the viscoelastic member is deformation in a direction in which the viscoelastic member stretches by being stretched, and therefore, has a deformation characteristic in which a linear component (spring constant) is larger than a nonlinear component (spring constant). Therefore, in the viscoelastic member, the elastic force based on the movement direction is constant. Therefore, in the present invention, by using the spring element in the shearing direction of the viscoelastic member, the reproducibility of the vibration acceleration with respect to the input signal can be improved, and therefore, vibration with a slight difference can be realized.

Drawings

Fig. 1 is a perspective view of an actuator according to embodiment 1 of the present invention.

Fig. 2 is an XZ sectional view of the actuator of embodiment 1.

Fig. 3 is an exploded perspective view of the actuator according to embodiment 1.

Fig. 4 is an exploded perspective view of the magnetic drive circuit, the yoke, and the holder of the actuator according to embodiment 1.

Fig. 5 is a perspective view of an actuator according to embodiment 2 of the present invention.

Fig. 6 is an XZ sectional view of the actuator of embodiment 2.

Fig. 7 is an exploded perspective view of the actuator according to embodiment 2 with the cover removed.

Fig. 8 is an XZ cross-sectional view of an actuator according to embodiment 3 of the present invention.

Fig. 9 is an exploded perspective view of an actuator according to embodiment 3.

Fig. 10 is an exploded perspective view of a magnetic drive circuit, a yoke, and a holder of an actuator according to embodiment 3.

Fig. 11 is a perspective view of an actuator according to embodiment 4 of the present invention.

Fig. 12 is an XZ sectional view of the actuator of embodiment 4.

Fig. 13 is an exploded perspective view of an actuator according to embodiment 4.

Fig. 14 is an exploded perspective view of a magnetic drive circuit, a yoke, and a holder of an actuator according to embodiment 4.

Fig. 15 is a perspective view of an actuator according to embodiment 5 of the present invention.

Fig. 16 is an XZ sectional view of the actuator according to embodiment 5.

Fig. 17 is an exploded perspective view of an actuator according to embodiment 5.

Fig. 18 is an exploded perspective view of a magnetic drive circuit, a yoke, and a holder of an actuator according to embodiment 5.

Fig. 19 is a perspective view of a magnetic drive circuit and a yoke of the fifth embodiment.

Detailed Description

Embodiments 1 to 5 of the present invention will be described below with reference to the drawings. In the following description, three directions intersecting each other will be described as a first direction Z, a second direction X, and a third direction Y. The first direction Z, the second direction X, and the third direction Y are mutually orthogonal directions. Note that X1 is marked on one side in the second direction X, X2 is marked on the other side in the second direction X, Y1 is marked on one side in the third direction Y, Y2 is marked on the other side in the third direction Y, Z1 is marked on one side in the first direction Z, and Z2 is marked on the other side in the first direction Z.

The actuator to which embodiments 1 to 5 of the present invention are applied includes: a magnetic drive circuit 6 for relatively moving the movable body 3 with respect to the support 2, and a viscoelastic member 9 for connecting the support 2 and the movable body 3, wherein the magnetic drive circuit 6 has a coil 7 and a magnet 8. Since the basic configurations of embodiments 1 to 5 are the same, the same reference numerals are given to corresponding portions for explanation. In the present invention, the magnetic drive circuit 6 may adopt a manner of driving the movable body 3 in one or both of the second direction X and the third direction Y. In addition, magnetic drive circuit 6 may employ a system in which coil 7 is provided on the support body 2 side and magnet 8 is provided on the movable body 3 side, and a system in which magnet 8 is provided on the support body 2 side and coil 7 is provided on the movable body 3 side. In the following description, the coil 7 is provided on the support body 2 side and the magnet 8 is provided on the movable body 3 side.