CN116470723A - Actuator with a spring - Google Patents

Abstract

In an actuator that vibrates a movable body through a magnetic drive circuit, collision between the movable body and a fixed body is suppressed, and a thrust reduction of the magnetic drive circuit is suppressed. The actuator (1) is provided with: a movable body (5) provided with a yoke (8) and a magnet (7); a support body (3) provided with a coil (10); and a connecting body (4) connected to the movable body and the support body. The coil and the magnet are opposed to each other in the Z direction, and a magnetic drive circuit (6) for vibrating the movable body in the X direction relative to the support body is formed. The cross-sectional shape of the magnet is a trapezoid with a first plane (73) facing the coil as an upper base and a second plane (74) abutting the yoke as a lower base. Alternatively, the magnet has a shape in which both ends in the X direction of the first surface facing the coil in the Z direction are recessed toward the yoke side than the center portion in the X direction of the first surface. Therefore, even if the movable body swings without going straight in the vibration direction, the possibility of the magnet colliding with the support body is small.

Description

Actuator with a spring

Technical Field

The present invention relates to an actuator that vibrates a movable body.

Background

Patent document 1 discloses an actuator including a movable body including a magnet and a support body including a coil, wherein a driving current is caused to flow through the coil to vibrate the movable body with respect to the support body. Such an actuator uses an elastic body or a viscoelastic body as a connecting body connecting the support body and the movable body. When the movable body is vibrated, a reaction force corresponding to the vibration of the movable body is applied to the support body via the connection body. As a result, the user in contact with the support body can feel the vibration.

In the actuator of patent document 1, the support body is provided with a coil holder. The coil is an air-core coil, and is disposed in a coil disposition hole provided in a plate portion of the coil holder. A metal plate is attached to the coil holder so as to cover the plate portion and the coil from both sides. The movable body includes a first yoke facing the coil from one side and a second yoke facing the coil from the other side, and magnets are fixed to the first yoke and the second yoke, respectively.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2020-102901

Disclosure of Invention

In the actuator of patent document 1, a connecting body is disposed at a portion of a plate covering a coil that faces a yoke. The connecting body is connected with the magnetic yoke at two ends of the movable body in the long side direction. Here, since the vibration characteristics of the actuator vary according to the spring constant or the size of the connection body, the width of the connection body may be set small so that the vibration characteristics of the actuator match the required value. If the width of the connecting member is small, the movable member does not oscillate like a pendulum when vibrating, and the movable member may collide with the support member to generate a collision sound. If the gap between the movable body and the fixed body is increased to avoid collision, the thrust of the magnetic drive circuit is reduced, and large vibration cannot be generated.

In view of the above, an object of the present invention is to suppress a collision between a movable body and a fixed body and to suppress a decrease in thrust of a magnetic drive circuit.

In order to solve the above-described problems, a first aspect of the present invention is an actuator comprising: a movable body; a support body having a housing for accommodating the movable body; a connecting body connected to the movable body and the supporting body; and a magnetic drive circuit including a coil and a magnet facing the coil in a first direction, the magnetic drive circuit vibrating the movable body relative to the support body in a second direction intersecting the first direction, the movable body including a yoke holding the magnet, the yoke including a facing portion facing the coil in the first direction, the magnet being fixed to the facing portion, the magnet including: a first plane opposite to the coil in the first direction; a second plane abutting against the opposing portion; and a pair of side surfaces extending from both ends of the first plane in the second direction toward the second plane side and connected to the second plane, the pair of side surfaces each having a first inclined surface connected to the first plane at an angle forming an obtuse angle.

According to a first aspect of the present invention, a yoke constituting a movable body of an actuator includes an opposing portion opposing a coil in a first direction, and a magnet fixed to the opposing portion opposes the coil in the first direction. Therefore, the movable body can be vibrated in the second direction intersecting the first direction. Further, the gap between the center portion of the magnet in the second direction and the coil is narrow, and the first inclined surfaces are provided at both ends in the second direction, so the gap between the both end portions in the second direction and the coil is wide. Therefore, even when the movable body does not oscillate in the second direction and swings like a pendulum, the possibility of the magnet colliding with the support body holding the coil is small. Further, since the gap between the center portion of the magnet in the second direction and the coil is small, the thrust of the magnetic drive circuit can be suppressed from decreasing. Further, the volume of the magnet is reduced by the amount that both ends of the magnet in the second direction are cut and recessed by the first inclined surface, so that the component cost of the magnet can be reduced.

In the present invention, the first inclined surface is connected to an end of the second plane in the second direction.

Thus, the cross-sectional shape of the first magnet is a trapezoid having the first plane as an upper base and the second plane as a lower base. Therefore, the maximum width of the magnet (the width of the second plane) can be increased while the width of the first plane facing the coil is reduced, and therefore, the decrease in the magnetic flux interlinking with the coil can be suppressed, and the decrease in the thrust of the magnetic drive circuit can be suppressed.

In the present invention, it is preferable that each of the pair of side surfaces has a second inclined surface connected to an end of the second plane in the second direction at an angle forming an obtuse angle, and the first inclined surface and the second inclined surface are connected in a curved shape. In this way, the magnet has a shape in which both the corner of the first plane in the second direction and the corner of the second plane in the second direction are cut away, and therefore, it is not necessary to distinguish between the front and back sides of the magnet. Thus, the ease of assembly is improved.

In order to solve the above problem, a second aspect of the present invention is an actuator comprising: a movable body; a support body having a housing for accommodating the movable body; a connecting body connected to the movable body and the supporting body; and a magnetic drive circuit including a coil and a magnet facing the coil in a first direction, the magnet being configured to vibrate the movable body with respect to the support body in a second direction intersecting the first direction, the movable body including a yoke for holding the magnet, the yoke including a facing portion facing the coil in the first direction, the magnet being fixed to the facing portion, the magnet including a first surface facing the coil in the first direction, the first surface being concave toward the facing portion side from a center portion in the second direction.

According to a second aspect of the present invention, a yoke constituting a movable body of an actuator includes an opposing portion opposing a coil in a first direction, and a magnet fixed to the opposing portion opposes the coil in the first direction. Therefore, the movable body can be vibrated in the second direction intersecting the first direction. In addition, the gap between the center part of the magnet in the second direction and the coil is narrow, and the gap between the two end parts of the magnet in the second direction and the coil is wide. Therefore, even when the movable body does not oscillate in the second direction and swings like a pendulum, the possibility of the magnet colliding with the support body holding the coil is small. Further, since the gap between the center portion of the magnet in the second direction and the coil is small, the thrust of the magnetic drive circuit can be suppressed from decreasing. Further, since the volume of the magnet is reduced by the amount of the recess of the both end portions of the magnet in the second direction, the component cost of the magnet can be reduced.

In the present invention, a central portion of the first surface in the second direction is a first plane perpendicular to the first direction, and stepped portions recessed toward the opposite portion side than the first plane are provided at both end portions of the first surface in the second direction. In this way, the width of the first plane, which is small in the gap with the coil, can be ensured, and the gap between the coil and the both end portions of the magnet in the second direction can be increased. Therefore, the thrust of the magnetic drive circuit can be suppressed from decreasing, and the possibility of collision of the magnet with the support body holding the coil can be reduced.

In the present invention, the first surface is a curved surface protruding toward the coil side with a center in the second direction as an apex. In this way, since the corner is not formed on the first surface, there is little possibility of the magnet being damaged when the corner collides with another object at the time of handling the magnet.

In the present invention, it is preferable that the width of the first plane in the second direction is smaller than the width of the coil in the second direction. In this way, even when the movable body does not oscillate in the second direction and swings like a pendulum, the possibility of the magnet colliding with the member covering both ends of the coil in the second direction is small.

In the present invention, it is preferable that the maximum width of the magnet in the second direction is larger than the width of the coil in the second direction. In this way, the magnetic flux interlinking with the coil can be ensured, and therefore, the thrust of the magnetic drive circuit can be suppressed from decreasing.

In the present invention, the magnet is preferably symmetrical in the second direction. In this way, the possibility of collision of the magnet with the support is small in both cases when the end of one side of the magnet in the second direction swings in the direction approaching the coil and when the end of the other side of the magnet in the second direction swings in the direction approaching the coil.

In the present invention, the support preferably includes: a first plate overlapping the coil from one side of the first direction; and a second plate overlapping the coil from the other side in the first direction, the first plate including: a first plate portion extending in the second direction; and a pair of first bending portions that are bent from both ends of the first plate portion in the second direction toward the coil side and cover both sides of the coil in the second direction, wherein the second plate includes: a second plate portion extending in the second direction; and a pair of second bending portions that are bent from both ends of the second plate portion in the second direction toward the coil side and cover both sides of the coil in the second direction, the opposing portions including: a first opposing portion opposing the first plate portion from one side of the first direction; and a second opposing portion opposing the second plate portion from the other side in the first direction, the magnet including a first magnet fixed to the first opposing portion; and a second magnet fixed to the second opposing portion, the first opposing portion and the second opposing portion each including a magnet fixing portion and a pair of connector fixing portions extending from the magnet fixing portion to both sides of a third direction intersecting the first direction and the second direction, the connector including: a first connector for connecting the connector fixing portion of the first opposing portion to the first plate portion; and a second connecting body connecting the connecting body fixing portion of the second opposing portion and the second plate portion. By disposing the magnets on both sides of the coil in this way, the thrust force of the magnetic drive circuit can be increased. In addition, the coil can be protected by assembling the first plate and the second plate in a shape surrounding the coil. Further, since the connecting body is disposed inside the yoke, and the movable body and the support body are connected via the first plate and the second plate and the yoke, it is not necessary to secure a space for disposing the connecting body outside the yoke. Therefore, the height of the actuator in the first direction can be reduced to achieve miniaturization. The first magnet and the second magnet are both small in gap between the center portion in the second direction and the coil, and large in gap between the both end portions in the second direction and the coil. Therefore, even when the movable body does not oscillate in the second direction and swings like a pendulum, the first magnet and the second magnet are less likely to collide with the support body holding the coil.

In the present invention, it is preferable that the first magnet and the second magnet have the same shape and are reversely arranged in the first direction. In this way, the components can be used in common, and therefore, the cost of the components can be reduced. In addition, since it is not necessary to separately assemble the first magnet and the second magnet, ease of assembly is improved.

Effects of the invention

According to the present invention, the yoke constituting the movable body of the actuator includes the opposing portion opposing the coil in the first direction, and the magnet fixed to the opposing portion opposes the coil in the first direction. Therefore, the movable body can be vibrated in the second direction intersecting the first direction. In addition, the gap between the center part of the magnet in the second direction and the coil is narrow, and the gap between the two end parts of the magnet in the second direction and the coil is wide. Therefore, even when the movable body does not oscillate in the second direction and swings like a pendulum, the possibility of the magnet colliding with the support body holding the coil is small. Further, since the gap between the center portion of the magnet in the second direction and the coil is small, the thrust of the magnetic drive circuit can be suppressed from decreasing. Further, since the volume of the magnet is reduced by the amount of the recess of the both end portions of the magnet in the second direction, the component cost of the magnet can be reduced.

Drawings

Fig. 1 is a perspective view of an actuator to which the present invention is applied, viewed from the Z2 direction and the Z1 direction.

Fig. 2 is a cross-sectional view (a cross-sectional view taken at A-A position in fig. 1) of the actuator when the actuator is cut in the longitudinal direction.

Fig. 3 is an explanatory view of a cross-sectional shape of the magnet and a cross-sectional view of the actuator when the actuator is cut in a direction perpendicular to the longitudinal direction (a cross-sectional view cut at a position B-B in fig. 1).

Fig. 4 is an exploded perspective view of the movable body and the coil assembly as seen from the Z2 direction.

Fig. 5 is an exploded perspective view of the movable body and the coil assembly as seen from the Z1 direction.

Fig. 6 is an exploded perspective view of the movable body as seen from the Z2 direction.

Fig. 7 is an exploded perspective view of the movable body as seen from the Z1 direction.

Fig. 8 is a cross-sectional view and an explanatory view of a cross-sectional shape of a magnet when the actuator including the magnet of modification 1 is cut in a direction orthogonal to the longitudinal direction.

Fig. 9 is a cross-sectional view and an explanatory view of a cross-sectional shape of a magnet when the actuator including the magnet of modification 2 is cut in a direction orthogonal to the longitudinal direction.

Fig. 10 is a cross-sectional view and an explanatory view of a cross-sectional shape of a magnet when the actuator including the magnet of modification 3 is cut in a direction orthogonal to the longitudinal direction.

Detailed Description

Hereinafter, embodiments of an actuator to which the present invention is applied will be described with reference to the drawings.

(integral structure)

Fig. 1 (a) is a perspective view of an actuator 1 to which the present invention is applied, as viewed from the Z2 direction.

Fig. 1 (b) is a perspective view of an actuator 1 to which the present invention is applied, as viewed from the Z1 direction. Fig. 2 is a cross-sectional view of the actuator 1 taken along the longitudinal direction, and is a cross-sectional view taken at the position A-A in fig. 1. Fig. 3 (a) is a cross-sectional view of the actuator 1 taken in a direction perpendicular to the longitudinal direction, and is a cross-sectional view taken at the position B-B in fig. 1. Fig. 3 (b) is an explanatory diagram of the cross-sectional shape of the magnet 7. Fig. 4 is an exploded perspective view of the movable body 5 and the coil assembly 30 as seen from the Z2 direction. Fig. 5 is an exploded perspective view of the movable body 5 and the coil assembly 30 as seen from the Z1 direction.

The actuator 1 is used as a haptic device for transmitting information by vibration. As shown in fig. 1 (a) and 1 (b), the actuator 1 has a rectangular parallelepiped shape. The actuator 1 generates vibration in the short side direction of its outer shape. In the following description, the short side direction in which vibration occurs is referred to as the X direction (second direction), the direction orthogonal to the X direction as the long side direction of the actuator 1 is referred to as the Y direction (third direction), and the direction orthogonal to the X direction and the Y direction as the thickness direction (height direction) of the actuator 1 is referred to as the Z direction (first direction). One side in the X direction is the X1 direction, and the other side is the X2 direction. One side in the Y direction is set as the Y1 direction, and the other side is set as the Y2 direction. One side in the Z direction is set as the Z1 direction, and the other side is set as the Z2 direction.

As shown in fig. 1, 2, and 3, the actuator 1 includes: a support body 3 provided with a housing 2 having a predetermined shape; and a movable body 5 housed inside the case 2. The actuator 1 further includes: a connecting body 4 connecting the support body 3 and the movable body 5; and a magnetic drive circuit 6 (see fig. 2 and 3) for moving the movable body 5 relative to the support body 3 in the X direction.

(support)

As shown in fig. 2 to 5, the support 3 includes a coil 10, a first plate 11 overlapping in the Z1 direction of the coil 10, and a second plate 12 overlapping in the Z2 direction of the coil 10. The first plate 11 and the second plate 12 are made of a non-magnetic metal. The coil 10 is located at the center of the housing 2 in the Z direction. The coil 10 is a flat air core coil, and its thickness direction is oriented in the Z direction. The coil 10 is long in the Y direction, and has a pair of long side portions 10a and 10b extending in parallel in the Y direction. A center hole 10c extending in the Y direction is provided between the pair of long side portions 10a, 10b.

As shown in fig. 2, 4, and 5, the support body 3 includes: a first holder member 15 disposed on the Y1 side of the coil 10; and a second holder member 16 disposed on the Y2 side of the coil 10. The first holder member 15 and the second holder member 16 are made of resin. The first holder member 15 includes: a first coil holding portion 151 disposed between the first plate 11 and the second plate 12; and a first side plate 152 extending from the Y1 side end of the first coil holding portion 151 in the Z1 direction and the Z2 direction. The second holder member 16 includes: a second coil holding portion 161 disposed between the first plate 11 and the second plate 12; and a second side plate portion 162 extending from an end portion of the second coil holding portion 161 on the Y2 side in the Z1 direction and the Z2 direction. The coil 10 is disposed between the first coil holding portion 151 and the second coil holding portion 161.

A power feeding board 14 is fixed to the first holder member 15. In the present embodiment, the power supply substrate 14 is a flexible printed board. The power feeding substrate 14 may be a rigid substrate.

Power is supplied to the coil 10 via the power supply substrate 14.

The first plate 11 includes: a first plate portion 111 overlapping the coil 10 from the Z1 side; and a pair of first bending portions 112 that are bent from both ends of the first plate portion 111 in the X direction in the Z2 direction. The second plate 12 includes: a second plate portion 121 overlapping the coil 10 from the Z2 side; and a pair of second bending portions 122 bending from both ends of the second plate portion 121 in the X direction toward the Z1 direction.

The first plate 11 is provided with first fixing portions 113 bent in the Z2 direction from the first plate portion 111 on the Y1 side and the Y2 side of each first bending portion 112. The second plate 12 is provided with second fixing portions 123 bent in the Z1 direction from the second plate portion 121 on the Y1 side and the Y2 side of each second bending portion 122.

When the first plate 11 and the second plate 12 are assembled to the first coil holding portion 151 and the second coil holding portion 161 from both sides in the Z direction, the first bending portion 112 and the second bending portion 122 cover the long side portions 10a, 10b of the coil 10 from both sides in the X direction as shown in fig. 3. In addition, on both sides of the first bent portion 112 and the second bent portion 122 in the Y direction, the first fixing portion 113 of the first plate 11 and the second fixing portion 123 of the second plate 12 overlap. The first fixing portion 113 and the second fixing portion 123 are locked in the Z direction. The claw 153 provided on the side surface of the first coil holding portion 151 and the claw 163 provided on the side surface of the second coil holding portion 161 are engaged with the notch portions provided in the first fixing portion 113 and the second fixing portion 123.

When the actuator 1 is assembled, a coil group 30 is formed by assembling the coil 10, the first plate 11, the second plate 12, the first holder member 15, and the second holder member 16. Then, the movable body 5 is assembled so as to surround the coil group 30, and the movable body 5 and the coil group 30 are connected by the connecting body 4. Then, the coil assembly 30 and the movable body 5 are housed in the case 2.

As shown in fig. 1, 2, and 3, the housing 2 includes a first housing member 31 and a second housing member 32 that overlap in the Z direction. The first housing member 31 is assembled to the first holder member 15 and the second holder member 16 from the Z1 direction. The second housing member 32 is assembled to the first holder member 15 and the second holder member 16 from the Z2 direction.

(Movable body)

Fig. 6 is an exploded perspective view of the movable body 5 as seen from the Z2 direction. Fig. 7 is an exploded perspective view of the movable body 5 as seen from the Z1 direction. The movable body 5 includes a magnet 7 and a yoke 8. As shown in fig. 2 and 3, the magnet 7 faces the coil 10 in the Z direction. The coil 10 and the magnet 7 constitute a magnetic drive circuit 6. The movable body 5 includes a first magnet 71 and a second magnet 72 as the magnets 7. The first magnet 71 is located in the Z1 direction of the coil 10. The second magnet 72 is located in the Z2 direction of the coil 10. The first magnet 71 and the second magnet 72 are polarized in the X direction in two. As shown in fig. 3, when the movable body 5 and the support body 3 are assembled, the first magnet 71 faces the long side portions 10a, 10b of the coil 10 in the Z1 direction, and the second magnet 72 faces the long side portions 10a, 10b of the coil 10 in the Z2 direction.

In the present embodiment, the yoke 8 is made of a magnetic material. The yoke 8 includes a facing portion 80 facing the coil 10 in the Z direction, and the magnet 7 is fixed to the facing portion 80. As shown in fig. 2 and 3, the facing portion 80 includes: a first opposing portion 801 opposing the coil 10 from the Z1 direction; and a second opposing portion 802 opposing the coil 10 from the Z2 direction. The yoke 8 includes a pair of connecting portions 803 extending in the Z direction on both sides of the coil 10 in the X direction. A pair of connection portions 803 connects the first opposing portion 801 and the second opposing portion 802. The first opposing portion 801 and the second opposing portion 802 each include: a magnet fixing portion 804 for fixing the magnet 7; and a pair of connector fixing portions 805 extending from the magnet fixing portion 804 to both sides in the Y direction.

As shown in fig. 2 to 7, the yoke 8 includes a first yoke 81 and a second yoke 82. The first yoke 81 is configured by joining two members, i.e., a first inner member 83 overlapping the coil 10 in the Z1 direction and a first outer member 84 overlapping the first inner member 83 in the Z1 direction. The second yoke 82 is configured by joining two members, namely, a second inner member 85 overlapping the coil 10 in the Z2 direction and a second outer member 86 overlapping the second inner member 85 in the Z2 direction.

As shown in fig. 4 and 5, the first outer member 84 includes: a first flat plate portion 841 longer in the Y direction; and a pair of first connecting plate portions 842 extending from both ends of the first flat plate portion 841 in the X direction in the Z2 direction. A first inner member 83 having a flat plate shape is fixed from the Z2 direction to the center of the first flat plate portion 841 in the Y direction. Both ends of the first flat plate portion 841 in the X direction extend to both sides of the first inner member 83 in the Y direction.

That is, the first opposing portion 801 of the yoke 8 is configured by stacking the first flat plate portion 841 and the first inner member 83 in the Z direction. In the first opposing portion 801, a portion where the first flat plate portion 841 and the first inner member 83 are stacked constitutes a magnet fixing portion 804 that fixes the first magnet 71. Further, at both ends of the first opposing portion 801 in the Y direction, a pair of connector fixing portions 805 extending from the magnet fixing portion 804 to both sides in the Y direction are provided. As shown in fig. 2, on both sides of the first magnet 71 in the Y direction, a pair of connector fixing portions 805 are connected to the first plate 11 via the first connectors 9A, respectively.

As shown in fig. 4 and 5, the second outer member 86 includes: a second flat plate portion 861 longer in the Y direction; and a pair of second connecting plate portions 862 extending from both ends of the second plate portion 861 in the X direction in the Z1 direction. A second inner member 85 having a flat plate shape is fixed from the Z1 direction to the center of the second flat plate portion 861 in the Y direction. Both ends of the second flat plate portion 861 in the Y direction extend to both sides of the second inner member 85 in the Y direction.

That is, the second opposing portion 802 of the yoke 8 is formed by stacking the second flat plate portion 861 and the second inner member 85 in the Z direction. In the second opposing portion 802, a portion where the second flat plate portion 861 and the second inner member 85 are stacked constitutes a magnet fixing portion 804 that fixes the second magnet 72. Further, at both ends of the second opposing portion 802 in the Y direction, a pair of connector fixing portions 805 extending from the magnet fixing portion 804 to both sides in the Y direction are provided. As shown in fig. 2, on both sides of the second magnet 72 in the Y direction, a pair of connector fixing portions 805 are connected to the second plate 12 via the second connectors 9B, respectively.

When the yoke 8 is assembled, the first inner member 83 is joined to the first outer member 84 by welding. In addition, the second inner member 85 is joined to the second outer member 86 by welding. Then, the pair of second connecting plate portions 862 of the second yoke 82 are pressed into and fixed to the inner sides of the pair of first connecting plate portions 842 of the first yoke 81. Thus, a pair of connecting portions 803 are formed, and the yoke 8 is assembled in a shape surrounding the outer peripheral sides of the coil 10, the first plate 11, and the second plate 12.

(connector)

As shown in fig. 2, the connector 4 includes a first connector 9A and a second connector 9B. The first connector 9A and the second connector 9B have rectangular parallelepiped shapes long in the X direction. The first connector 9A is located on the Z1 side of the coil 10. The second connector 9B is located on the Z2 side of the coil 10.

The first connector 9A is disposed at two positions on the Y1 side and the Y2 side of the first magnet 71, and is composed of two members having the same shape. The second connector 9B is disposed at two positions on the Y1 side and the Y2 side of the second magnet 72, and is composed of two members having the same shape. The first and second connection bodies 9A and 9B have at least one of elasticity and viscoelasticity, respectively.

The first connecting body 9A is disposed between the first yoke 81 and the first plate 11. As described above, the first connector 9A is sandwiched between the connector fixing portion 805 of the first opposing portion 801 and the first plate 11 on both sides in the Y direction of the coil 10. The first connecting body 9A is compressed in the Z direction between the connecting body fixing portion 805 and the first plate 11.

The second connecting body 9B is disposed between the second yoke 82 and the second plate 12. As described above, the second connector 9B is sandwiched between the connector fixing portion 805 of the second opposing portion 802 and the second plate 12 on both sides in the Y direction of the coil 10. The second link 9B is compressed in the Z direction between the link fixing portion 805 and the second plate 12.

In the present embodiment, the first connector 9A and the second connector 9B are gel-like members made of silicone gel. Silicone gel is a viscoelastic body having a spring constant when deformed in the expansion and contraction direction that is about 3 times the spring constant when deformed in the shearing direction. When the viscoelastic body deforms in a direction (shearing direction) intersecting the thickness direction, the viscoelastic body deforms in a direction in which the viscoelastic body is stretched and elongated, and thus has a deformation characteristic in which the linear component is larger than the nonlinear component. The sheet has a stretch characteristic in which the nonlinear component is larger than the linear component when the sheet is pressed in the thickness direction and deformed in compression, and a stretch characteristic in which the linear component is larger than the nonlinear component when the sheet is stretched in the thickness direction and elongated.

Alternatively, as the first connector 9A and the second connector 9B, various rubber materials such as natural rubber, diene rubber (for example, styrene-butadiene rubber, isoprene rubber, butadiene rubber, chloroprene rubber, acrylonitrile-butadiene rubber, and the like), non-diene rubber (for example, butyl rubber, ethylene-propylene-diene rubber, urethane rubber, silicone rubber, and fluororubber), thermoplastic elastomer, and modified materials thereof may be used.

(cross-sectional shape of magnet)

As shown in fig. 3 (a) and 3 (b), the magnet 7 has a flat plate shape, and a cross-sectional shape cut along the XZ plane is trapezoidal. As described above, in the present embodiment, the first magnet 71 fixed to the first opposing portion 801 of the yoke 8 and the second magnet 72 fixed to the second opposing portion 802 of the yoke 8 are provided as the magnets 7.

The first magnet 71 includes: a first plane 73 opposite to the coil 10 from the Z1 direction; a second plane 74 abutting against the first opposing portion 801 of the yoke 8; and a pair of side surfaces 75 extending from both ends of the first plane 73 in the X direction toward the second plane 74 and connected to both ends of the second plane 74 in the X direction. The first plane 73 and the second plane 74 are parallel and extend in the X-direction. The pair of side surfaces 75 each have a first inclined surface 751 connected at an obtuse angle with respect to the first plane 73. In the present embodiment, the entire side surface 75 is formed of the first inclined surface 751, and the first inclined surface 751 and the second inclined surface 74 are connected at an acute angle.

As shown in fig. 3 (b), the first magnet 71 faces the coil 10 through the first plate portion 111 of the first plate 11, and the width D1 of the first plane 73 in the X direction is smaller than the width D of the first plate portion 111 in the X direction. In the first magnet 71, the width D1 of the first plane 73 facing the coil 10 in the Z1 direction in the X direction is smaller than the width D0 of the coil 10 in the X direction. The width D2 of the second plane 74 of the first magnet 71 in the X direction is larger than the width D0 of the coil 10 in the X direction.

The first magnet 71 and the second magnet 72 have the same shape and are disposed in the opposite direction in the Z direction. That is, the second magnet 72 includes: a first plane 73 opposite to the coil 10 from the Z2 direction; a second plane 74 abutting against the second opposing portion 802 of the yoke 8; and a pair of side surfaces 75 extending from both ends of the first plane 73 in the X direction toward the second plane 74 and connected to both ends of the second plane 74 in the X direction. The pair of side surfaces 75 are each constituted by a first inclined surface 751 connected at an obtuse angle with respect to the first plane 73, and are connected at an acute angle with respect to the second plane 74.

(action of actuator)

When a current in a predetermined direction is supplied to the coil 10 via the power supply substrate 14, the movable body 5 supported by the support body 3 is moved relative to the support body 3 in one side in the X direction by the driving force of the magnetic drive circuit 6. After that, when the direction of the current is reversed, the movable body 5 moves relative to the support body 3 to the other side in the X direction. By repeating the reversal of the direction of the current supplied to the coil 10, the movable body 5 vibrates. When the movable body 5 vibrates in the X direction, the first and second connection bodies 9A and 9B deform in the shearing direction.

(main effects of the present embodiment)

As described above, the actuator 1 of the present embodiment includes: a movable body 5; a support body 3 provided with a housing 2 accommodating the movable body 5; a connecting body 4 connected to the movable body 5 and the support body 3; and a magnetic drive circuit 6 that includes a coil 10 and a magnet 7 facing the coil 10 in the Z direction, and vibrates the movable body 5 with respect to the support body 3 in the X direction intersecting the Z direction. The movable body 5 includes a yoke 8 holding the magnet 7, the yoke 8 includes opposing portions 80 (first opposing portion 801 and second opposing portion 802) opposing the coil 10 in the Z direction, and the magnet 7 (first magnet 71 and second magnet 72) is fixed to the opposing portions 80. The magnet 7 includes: a first plane 73 opposite to the coil 10 in the Z direction; a second plane 74 abutting against the opposing portion 80; and a pair of side surfaces 75 extending from both ends of the first plane 73 in the X direction toward the second plane 74, respectively, and connected to the second plane 74. The pair of side surfaces 75 each have a first inclined surface 751 connected to the first plane 73 at an obtuse angle.

In the present embodiment, the yoke 8 of the movable body 5 constituting the actuator 1 includes the opposing portion 80 opposing the coil 10 in the Z direction, and the magnet 7 fixed to the opposing portion 80 opposes the coil 10 in the Z direction. The gap between the center portion (first plane 73) of the magnet 7 in the X direction and the coil 10 is narrow, and the first inclined surfaces 751 forming an obtuse angle with respect to the first plane 73 are provided at both ends in the X direction, so that the gap between both end portions in the X direction and the coil 10 is wide. Therefore, even when the movable body 5 swings like a pendulum about an axis extending in the Y direction instead of being straight in the X direction, the possibility that both ends of the magnet 7 in the X direction collide with the first plate 11 and the second plate 12 covering the coil 10 is small. Further, since the gap between the center portion of the magnet 7 in the X direction and the coil 10 is small, the thrust of the magnetic drive circuit 6 can be suppressed from decreasing. Further, the volume of the magnet 7 is reduced by the amount that both ends in the X direction are cut and recessed by the first inclined surface 751, and therefore, the component cost of the magnet 7 is low.

In the present embodiment, the first inclined surface 751 is connected to the X-direction end of the second flat surface 74, and the cross-sectional shape of the first magnet 71 is a trapezoid having the first flat surface 73 as an upper base and the second flat surface 74 as a lower base. Therefore, even when the width D1 of the first plane 73 opposed to the coil 10 is reduced, since the width D2 of the second plane 74 is large, a decrease in magnetic flux interlinking with the coil 10 can be suppressed. Therefore, the thrust force of the magnetic drive circuit 6 can be suppressed from decreasing.

That is, in the present embodiment, since the width D1 of the first plane 73 of the magnet 7 is smaller than the width D0 of the coil 10, even when the movable body 5 does not oscillate straight in the X direction like a pendulum, the possibility that the magnet 7 collides with the members (the first plate 11 and the second plate 12) covering the coil 10 is small. On the other hand, the maximum width of the magnet 7 (in the present embodiment, the width D2 of the second plane 74) is larger than the width D0 of the coil 10. Therefore, the magnetic flux interlinking with the coil 10 can be ensured, and therefore the thrust of the magnetic drive circuit 6 can be suppressed from decreasing.

In the present embodiment, the magnet 7 has a symmetrical shape in the X direction. Therefore, in both cases, when the end of one side of the magnet 7 in the X direction swings in the direction approaching the coil 10 and when the end of the other side of the magnet 7 in the X direction swings in the direction approaching the coil 10, the possibility that the magnet 7 collides with the support 3 is small.

In the present embodiment, the support 3 includes: a first plate 11 overlapped from the Z1 direction with respect to the coil 10; and a second plate 12 overlapped from the Z2 direction with respect to the coil 10. The first plate 11 includes: a first plate portion 111 extending in the X direction; and a pair of first bending portions 112 that are bent from both ends of the first plate portion 111 in the X direction toward the coil 10 side and cover both sides of the coil 10 in the X direction.

The second plate 12 includes: a second plate portion 121 extending in the X direction; and a pair of second bending portions 122 that are bent from both ends of the second plate portion 121 in the X direction toward the coil 10 side and cover both sides of the coil 10 in the X direction. The facing portion 80 includes: a first opposing portion 801 opposing the first plate portion 111 from the Z1 direction; and a second opposing portion 802 opposing the second plate portion 121 from the Z2 direction. The magnet 7 includes: a first magnet 71 fixed to the first opposing portion 801; and a second magnet 72 fixed to the second opposing portion 802. The first opposing portion 801 and the second opposing portion 802 each include: a magnet fixing portion 804; and a pair of connector fixing portions 805 extending from the magnet fixing portion 804 to both sides in the Y direction intersecting the Z direction and the X direction. The connector 4 includes: a first connector 9A connecting the connector fixing portion 805 of the first opposing portion 801 and the first plate portion 111; and a second connector 9B connecting the connector fixing portion 805 of the second opposing portion 802 and the second plate portion 121. By disposing the magnets 7 (the first magnet 71 and the second magnet 72) on both sides of the coil 10 in this way, the thrust force of the magnetic drive circuit 6 can be increased. In addition, by assembling the first plate 11 and the second plate 12 in a shape surrounding the coil 10, the coil 10 can be protected. Further, since the connecting bodies 4 (the first connecting body 9A and the second connecting body 9B) can be disposed inside the yoke 8, it is not necessary to secure a space for disposing the connecting bodies 4 outside the yoke 8. Therefore, the height of the actuator 1 in the Z direction can be reduced to achieve miniaturization. The first magnet 71 and the second magnet 72 are each small in the gap between the center portion in the X direction and the coil 10, and large in the gap between the both end portions in the X direction and the coil 10. Therefore, even when the movable body 5 does not oscillate in the X direction as if it were a pendulum, the first and second magnets 71 and 72 would be less likely to collide with the first and second plates 11 and 12 covering the coil 10.

In the present embodiment, the first magnet 71 and the second magnet 72 have the same shape and are disposed in the opposite direction in the Z direction. Therefore, the components can be used in common, and thus cost reduction can be achieved. In addition, since it is not necessary to separately assemble the first magnet 71 and the second magnet 72, the ease of assembly is high.

Modification 1

In the actuator of the above embodiment, the cross-sectional shape of the magnet 7 is a trapezoid, but the present invention can be applied to actuators having magnets with other cross-sectional shapes. That is, the magnet 7 may be formed in a shape in which both X-direction end portions of the first surface facing the coil 10 in the Z-direction are recessed toward the facing portion 80 side than the X-direction center portion of the first surface.

Fig. 8 (a) is a cross-sectional view of the actuator 1 including the magnet 7A of modification 1, when the actuator is cut in a direction perpendicular to the longitudinal direction. Fig. 8 (b) is an explanatory diagram of the cross-sectional shape of the magnet 7A.

The magnet 7A of modification example 1 includes: a first magnet 71A located in the Z1 direction of the coil 10; and a second magnet 72A located in the Z2 direction of the coil 10. The first magnet 71A and the second magnet 72A have the same shape and are disposed in the opposite direction in the Z direction. The first magnet 71A and the second magnet 72A are each symmetrical in the X direction.

The first magnet 71A includes: a first plane 73 opposite to the coil 10 from the Z1 direction; a second plane 74 abutting against the first opposing portion 801 of the yoke 8; and a pair of side surfaces 75A extending from both ends of the first plane 73 in the X direction toward the second plane 74 and connected to both ends of the second plane 74 in the X direction. The side surface 75A includes: a first inclined surface 751 connected at an obtuse angle with respect to an end portion of the first plane 73 in the X direction; and a second inclined surface 752 connected at an obtuse angle with respect to an end of the second plane 74 in the X direction. Each side surface 75A is a curved surface in which the first inclined surface 751 and the second inclined surface are connected in a curved shape, and is a shape protruding to both sides in the X direction.

The magnets 7A (the first magnets 71A and the second magnets 72A) according to modification 1 have a wide gap between the coil 10 and both end portions in the X direction, as in the above-described embodiment. Therefore, even when the movable body 5 does not oscillate in the X direction as if it were a pendulum, the possibility of the magnet 7 colliding with the first plate 11 and the second plate 12 covering the coil 10 is small. In addition, since the corner in the X direction of the first plane 73 and the corner in the X direction of the second plane 74 are cut off in the magnet 7A of modification 1, it is not necessary to distinguish between the front and back sides of the magnet 7A. Therefore, the ease of assembly is high.

As in the above embodiment, the magnet 7A (the first magnet 71A and the second magnet 72A) of modification 1 has a width D1 smaller than the width D0 of the coil 10, and therefore, even when the movable body 5 does not swing straight in the X direction and swings like a pendulum, there is a small possibility that the magnet 7A collides with the members (the first plate 11 and the second plate 12) covering the coil 10. On the other hand, the maximum width D2 of the magnet 7A is larger than the width D0 of the coil 10. Therefore, the magnetic flux interlinking with the coil 10 can be ensured, and therefore the thrust of the magnetic drive circuit 6 can be suppressed from decreasing.

Modification 2

Fig. 9 (a) is a cross-sectional view of the actuator 1 including the magnet 7B of modification 2 when the actuator is cut in a direction perpendicular to the longitudinal direction. Fig. 9 (B) is an explanatory diagram of the cross-sectional shape of the magnet 7B.

The magnet 7B of modification 2 includes: a first magnet 71B located in the Z1 direction of the coil 10; and a second magnet 72B located in the Z2 direction of the coil 10. The first magnet 71B and the second magnet 72B have the same shape and are disposed in the opposite direction in the Z direction. The first magnet 71B and the second magnet 72B are each symmetrical in the X direction.

The first magnet 71B has a first surface facing the coil 10 from the Z1 direction. The central portion of the first surface in the X direction is a first plane 73 perpendicular to the Z direction. The first surface has stepped portions 76 recessed toward the first opposing portion 801 side with respect to the first plane 73 at both ends in the X direction. The first magnet 71B has a second plane 74 in contact with the first opposing portion 801.

The magnets 7B (the first magnet 71B and the second magnet 72B) according to modification 2 have a wide gap between the coil 10 and both end portions in the X direction, as in the above-described embodiment. Therefore, even when the movable body 5 does not oscillate in the X direction as if it were a pendulum, the possibility of the magnet 7 colliding with the first plate 11 and the second plate 12 covering the coil 10 is small.

As in the above-described embodiment, the width D1 of the first plane 73 of the magnet 7B (the first magnet 71B and the second magnet 72B) according to modification 2 is smaller than the width D0 of the coil 10, and therefore, even when the movable body 5 does not swing straight in the X direction and swings like a pendulum, there is little possibility that the magnet 7B collides with the members (the first plate 11 and the second plate 12) covering the coil 10. On the other hand, the maximum width D2 of the magnet 7B is larger than the width D0 of the coil 10. Therefore, the magnetic flux interlinking with the coil 10 can be ensured, and therefore the thrust of the magnetic drive circuit 6 can be suppressed from decreasing.

Modification 3

Fig. 10 (a) is a cross-sectional view of the actuator 1 including the magnet 7C of modification 3 when the actuator is cut in a direction perpendicular to the longitudinal direction. Fig. 10 (b) is an explanatory diagram of the cross-sectional shape of the magnet 7C. The magnet 7C of modification 3 includes: a first magnet 71C located in the Z1 direction of the coil 10; and a second magnet 72C located in the Z2 direction of the coil 10. The first magnet 71C and the second magnet 72C have the same shape and are disposed in the opposite direction in the Z direction. The first magnet 71C and the second magnet 72C are symmetrical in the X direction.

The first magnet 71C has a first surface 77 facing the coil 10 from the Z1 direction. The first surface 77 is a curved surface protruding toward the coil 10 with the center in the X direction as the apex. The first magnet 71C includes a second flat surface 74 that abuts against the first opposing portion 801.

The magnets 7C (the first magnet 71C and the second magnet 72C) according to modification 3 have a wide gap between the coil 10 and both end portions in the X direction, as in the above-described embodiment. Therefore, even when the movable body 5 does not oscillate in the X direction as if it were a pendulum, the possibility of the magnet 7 colliding with the first plate 11 and the second plate 12 covering the coil 10 is small. Further, the maximum width D2 of the magnet 7C is larger than the width D0 of the coil 10. Therefore, the magnetic flux interlinking with the coil 10 can be ensured, and therefore the thrust of the magnetic drive circuit 6 can be suppressed from decreasing. Further, since the first surface 77 of the magnet 7C (the first magnet 71C and the second magnet 72C) is a curved surface and a surface having no corner, the magnet 7C is less likely to be damaged when colliding with another object during operation.

(other embodiments)

In the present embodiment, the first magnet 71 and the second magnet 72 are provided as the magnet 7, but only one of the first magnet 71 and the second magnet 72 may be provided. Further, as the connector 4, a structure in which only one of the first connector 9A and the second connector 9B is provided may be adopted. The yoke 8 is formed by stacking the inner member and the outer member, but a configuration may be adopted in which the yoke 8 is formed only by the outer member.

Symbol description

1: an actuator; 2: a housing; 3: a support body; 4: a connecting body; 5: a movable body; 6: a magnetic drive circuit; 7. 7A, 7B, 7C: a magnet; 8: a yoke; 9A: a first connecting body; 9B: a second connector; 10: a coil; 10. 10b: a long side portion; 10c: a central bore; 11: a first plate; 12: a second plate; 14: a power supply substrate; 15: a first cage member; 16: a second cage member; 30: a coil assembly; 31: a first housing member; 32: a second housing member; 71. 71A, 71B, 71C: a first magnet; 72. 72A, 72B, 72C: a second magnet; 73: a first plane; 74: a second plane; 75. 75A: a side surface; 76: a step portion; 77: a first surface; 80: an opposing portion; 81: a first yoke; 82: a second yoke; 83: a first inner member; 84: a first outer member; 85: a second inner member; 86: a second outer member; 111: a first plate portion; 112: a first bending portion; 113: a first fixing portion; 121: a second plate portion; 122: a second bending portion; 123: a second fixing portion; 151: a first coil holding portion; 152: a first side plate portion; 153: a claw portion; 161: a second coil holding portion; 162: a second side plate portion; 163: a claw portion; 751: a first inclined surface; 752: a second inclined surface; 801: a first opposing portion; 802: a second opposing portion; 803: a connection part; 804: a magnet fixing part; 805: a connector fixing portion; 841: a first flat plate portion; 842: a first connecting plate portion; 861: a second flat plate portion; 862: a second connecting plate portion; d: the width of the first plate part in the X direction; d0: the width of the coil in the X direction; d1: the width of the first plane in the X direction; d2: width of the second plane in the X direction.

Claims (11)

1. An actuator, comprising:

a movable body;

a support body having a housing accommodating the movable body;

a connecting body connected to the movable body and the support body; and

a magnetic drive circuit including a coil and a magnet facing the coil in a first direction, and vibrating the movable body with respect to the support body in a second direction intersecting the first direction,

the movable body includes a yoke for holding the magnet,

the yoke includes an opposing portion opposing the coil in the first direction, the magnet is fixed to the opposing portion,

the magnet is provided with: a first plane opposing the coil in the first direction; a second plane abutting the opposing portion; and a pair of side surfaces extending from both ends of the first plane in the second direction toward the second plane side and connected to the second plane,

the pair of side surfaces each have a first inclined surface connected to the first plane at an angle forming an obtuse angle.

2. The actuator of claim 1, wherein the actuator is configured to move the actuator,

The first inclined surface is connected to an end of the second plane in the second direction.

3. The actuator of claim 1, wherein the actuator is configured to move the actuator,

the pair of side surfaces each have a second inclined surface connected to an end of the second plane in the second direction at an obtuse angle, and the first inclined surface and the second inclined surface are connected in a curved shape.

4. An actuator, comprising:

a movable body;

a support body having a housing accommodating the movable body;

a connecting body connected to the movable body and the support body; and

a magnetic drive circuit including a coil and a magnet facing the coil in a first direction, and vibrating the movable body with respect to the support body in a second direction intersecting the first direction,

the movable body includes a yoke for holding the magnet,

the yoke includes an opposing portion opposing the coil in the first direction, the magnet is fixed to the opposing portion,

the magnet has a first surface facing the coil in the first direction,

the first surface is in a shape in which both end portions in the second direction are recessed toward the opposite portion side than the center portion in the second direction.

5. The actuator of claim 4, wherein the actuator is configured to move the actuator,

a central portion of the first surface in the second direction is a first plane perpendicular to the first direction,

a stepped portion recessed from the first plane toward the opposite portion side is provided at both end portions of the first surface in the second direction.

6. The actuator of claim 4, wherein the actuator is configured to move the actuator,

the first surface is a curved surface protruding toward the coil side with a center in the second direction as an apex.

7. The actuator of any one of claims 1, 2, 3, 5,

the width of the first plane in the second direction is smaller than the width of the coil in the second direction.

8. The actuator of any one of claims 1, 2, 3, 5,

the maximum width of the magnet in the second direction is larger than the width of the coil in the second direction.

9. The actuator of any one of claims 1, 2, 3, 5,

the magnet has a shape symmetrical in the second direction.

10. The actuator of any one of claims 1, 2, 3, 5,

The support body is provided with: a first plate overlapping the coil from one side of the first direction; and a second plate overlapping the coil from the other side of the first direction,

the first plate is provided with: a first plate portion extending in the second direction; and a pair of first bending portions which are bent from both ends of the first plate portion in the second direction toward the coil side and cover both sides of the coil in the second direction,

the second plate is provided with: a second plate portion extending in the second direction; and a pair of second bending portions which are bent from both ends of the second plate portion in the second direction toward the coil side and cover both sides of the coil in the second direction,

the facing portion includes: a first opposing portion opposing the first plate portion from one side in the first direction; and a second opposing portion opposing the second plate portion from the other side of the first direction,

the magnet is provided with: a first magnet fixed to the first opposing portion; and a second magnet fixed to the second opposing portion,

The first opposing portion and the second opposing portion each include a magnet fixing portion and a pair of connector fixing portions extending from the magnet fixing portion to both sides of a third direction intersecting the first direction and intersecting the second direction,

the connector includes: a first connecting body connecting the connecting body fixing portion of the first opposing portion with the first plate portion; and a second connecting body connecting the connecting body fixing portion of the second opposing portion with the second plate portion.

11. The actuator of claim 10, wherein the actuator is configured to move the actuator,

the first magnet and the second magnet have the same shape and are oppositely arranged in the first direction.