WO2019003874A1

WO2019003874A1 - Actuator

Info

Publication number: WO2019003874A1
Application number: PCT/JP2018/022170
Authority: WO
Inventors: 北原　裕士; 正武田; 将生土橋
Original assignee: 日本電産サンキョー株式会社
Priority date: 2017-06-30
Filing date: 2018-06-11
Publication date: 2019-01-03
Also published as: JP2019013087A

Abstract

This actuator 1 is provided with a magnetic drive circuit 6 which moves a movable body 3 relative to a support body 2. The movable body 3 is provided with a yoke 30 which retains magnets 8 of the magnetic drive circuit 6, and the yoke 30 comprises multiple yokes facing each other in a first direction Z, and positioned in the first direction Z by means of a linking member 34. Coils 7 are arranged in two stages in the support body 2, and the yoke 30 that retains the magnets 8 has a three-stage configuration, comprising a first yoke 31, a second yoke 32 and a third yoke 33. The first yoke 31, the second yoke 32 and the third yoke 33 are connected at substantially right angles to the linking member 34, and, seen in a direction perpendicular to the first direction Z, the first yoke 31, the second yoke 32 and the third yoke 33 overlap the connecting member 34.

Description

Actuator

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

As a device that generates a vibration by a magnetic drive mechanism, an actuator that vibrates a movable body in an axial direction with respect to a support by a magnetic drive circuit including a coil and a magnet has been proposed. In the actuator described in Patent Document 1, the yoke provided on the support includes an integral magnetic plate bent in a U-shape such that the first plate portion and the second plate portion face each other, and the first plate portion A permanent magnet is held on each of the surface on the second plate portion side and the surface on the first plate portion side of the second plate portion. Further, a coil held by the movable body is disposed between the magnet held by the first plate portion and the magnet held by the second plate portion side.

JP, 2016-127789, A

When using a yoke bent in a U-shape as in the actuator described in Patent Document 1, the surface of the first plate portion facing the second plate portion or the surface facing the first plate portion of the second plate portion For example, it takes a lot of time to fix the magnet, and it is difficult to efficiently manufacture the yoke to which the magnet is fixed. Therefore, a yoke having a first plate portion and a second plate portion arranged in two stages by connecting two members of a first yoke having a first plate portion and a second yoke having a second plate portion. It has been proposed to make

Further, Patent Document 1 proposes an actuator in which a magnetic drive circuit including a coil and a magnet is arranged in two stages. In such a configuration, a three-stage yoke in which a yoke is disposed between two sets of magnetic drive circuits can be used. When a three-tiered yoke is used, the surfaces for fixing the magnets can be provided in three tiers. Moreover, the weight of the movable body 3 can be secured, and the magnetic efficiency can be improved. However, the three-tiered yoke is manufactured by assembling a plurality of members. For example, the first yoke, the second yoke, and the third yoke are stacked and connected in the height direction. However, when a plurality of members are stacked and connected in the height direction as described above, component tolerances of the plurality of members are accumulated in the height direction of the yoke, and the dimensional accuracy of the yoke as a whole decreases. As a result, the positional accuracy of the movable body with respect to the support decreases, and there is a possibility that the movable body can not be properly driven.

In view of the above problems, it is an object of the present invention to provide an actuator capable of suppressing a reduction in dimensional accuracy of a yoke.

In order to solve the above problems, an actuator to which the present invention is applied includes a support, a movable body movably supported by the support, and a magnetic drive circuit for moving the movable body relative to the support. And the magnetic drive circuit is provided on a coil provided on one side member of the support and the movable body, and on the other side member of the support and the movable body. The coil includes a magnet facing in a first direction, and the movable body is driven in a second direction crossing the first direction, and the other side member is a first yoke facing in the first direction. And a plurality of yokes including a second yoke, and a connecting member for positioning and connecting the plurality of yokes in the first direction.

In the present invention, among the support and the movable body, on the side where the magnet of the magnetic drive circuit is provided, the plurality of yokes opposed in the first direction are positioned in the first direction by the connecting member. As described above, when all the yokes are positioned with respect to the connecting member, it is possible to suppress that the component tolerances of the plurality of yokes build up and the dimensional accuracy in the first direction of the entire yoke decreases. Therefore, it can suppress that the position accuracy of the 1st direction of the movable body with respect to a support body falls.

In the present invention, the plurality of yokes may include a third yoke opposed to the second yoke in the first direction opposite to the first yoke, and the coil may include the first yoke and the second yoke. The magnet is disposed between the yokes and between the second yoke and the third yoke, and the magnet is fixed to a surface of the first yoke, the second yoke, and the third yoke facing the coil. The connection member may adopt a configuration in which the first yoke, the second yoke, and the third yoke are positioned and connected in the first direction. In this way, it is possible to suppress the reduction in dimensional accuracy in the first direction of the three-tiered yoke. Also, the coils can be arranged in two stages, and magnets fixed to the three-stage yoke can be arranged on both sides in the first direction of each coil.

In the present invention, it is possible to adopt a configuration in which the plurality of yokes overlap the connection member when viewed in the direction orthogonal to the first direction. In this case, since the height in the first direction of the connecting member is the height in the first direction of the entire yoke, the component tolerance of the connecting member and the component tolerance of the yoke are stacked, and the dimension of the entire yoke in the first direction It is possible to suppress the decrease in accuracy.

In the present invention, the plurality of yokes have end portions connected to the connection member, a convex portion is formed on one of the connection member and the end portion, and a concave portion to be fitted to the convex portion is on the other. The configuration formed can be adopted. Thus, the recess and the protrusion can be fitted to position the connecting member and the end of the yoke.

In the present invention, the ends of the plurality of yokes may be fixed by welding using the connection member.

In the present invention, each of the plurality of yokes includes a plurality of arm portions projecting in a plurality of directions, and the connecting member adopts a configuration for connecting the tips of the overlapping arm portions as viewed from the first direction. be able to. In this case, the yokes are connected at a plurality of connection points, and the dimensional accuracy of each connection point in the first direction is determined by the component tolerance of the connection member. Therefore, the decrease in dimensional accuracy in the first direction of the entire yoke can be further reduced.

In this case, the magnetic drive circuit drives the movable body in a third direction intersecting the second direction and the second direction, and the plurality of arm portions are disposed on one side of the second direction. The first arm which protrudes, the second arm which protrudes to the other side in the second direction, the third arm which protrudes to one side in the third direction, and the other side which protrudes in the third direction A fourth arm unit is provided, and the connection member is configured to connect a first connection member connecting the first arm unit, a second connection member connecting the second arm unit, and a third connection unit connecting the third arm unit. A connecting member and a fourth connecting member for connecting the fourth arm, wherein the one side member includes a holder for holding the coil, and the holder includes the first connecting member and the second connecting member While restricting the movable range in the third direction, the third connecting member and the fourth connecting member It is possible to adopt a configuration for regulating the movable range of directions. Thus, when the movable body moves in the second direction and the third direction, the movable member in the second direction and the third direction can be restricted by the connecting member and the holder. Therefore, the impact resistance of the actuator can be enhanced.

In the present invention, the one side member may be the support, and the other side member may be the movable body. In this way, it is possible to suppress a decrease in dimensional accuracy in the first direction of the yoke provided in the movable body. Therefore, the movable body can be properly driven.

According to the present invention, on the side of the support and the movable body on which the magnet of the magnetic drive circuit is provided, the plurality of yokes opposed in the first direction are positioned in the first direction by the connecting member. As described above, when all the yokes are positioned with respect to the connecting member, it is possible to suppress that the component tolerances of the plurality of yokes build up and the dimensional accuracy in the first direction of the entire yoke decreases. Therefore, it can suppress that the position accuracy of the 1st direction of the movable body with respect to a support body falls.

It is a perspective view of an actuator concerning an embodiment of the present invention. It is XZ sectional drawing of the actuator shown in FIG. It is a disassembled perspective view of the actuator shown in FIG. It is a disassembled perspective view of a movable body and a holder. It is a perspective view of a movable body and a coil. It is a top view of a movable body and a holder.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, three directions intersecting with each other will be described as a first direction Z, a second direction X, and a third direction Y, respectively. The first direction Z, the second direction X, and the third direction Y are directions orthogonal to each other. In addition, X1 is attached to one side in the second direction X, X2 is attached to the other side in the second direction X, Y1 is attached to one side in the third direction Y, Y2 is attached to the other side in the third direction Y In the description, one side of the first direction Z is attached with Z1 and the other side of the first direction Z is attached with Z2.

(overall structure)
FIG. 1 is a perspective view of an actuator 1 according to an embodiment of the present invention. FIG. 2 is an XZ sectional view of the actuator 1 of FIG. FIG. 3 is an exploded perspective view of the actuator 1 of FIG. As shown in FIG. 1, the planar shape of the actuator 1 as viewed in the first direction Z is a square. The actuator 1 has a support 2 and a movable body 3, a magnetic drive circuit 6 for moving the movable body 3 relative to the support 2, and a visco-elastic member 9 for connecting the support 2 and the movable body 3. The actuator 1 includes, as the magnetic drive circuit 6, a first magnetic drive circuit 6X that vibrates the movable body 3 in the second direction X, and a second magnetic drive circuit 6Y that vibrates the movable body 3 in the third direction Y. The first magnetic drive circuit 6X and the second magnetic drive circuit 6Y have a coil 7 and a magnet 8.

In the present invention, an aspect in which the movable body 3 is driven in one or both of the second direction X and the third direction Y can be adopted. In the magnetic drive circuit 6, the coil 7 is provided on the support 2 side, the magnet 8 is provided on the movable body 3 side, the magnet 8 is provided on the support 2 side, and the coil 7 is provided. The aspect provided in the movable body 3 side is employable. In the following description, the coil 7 is provided on the side of the support 2 and the magnet 8 is mainly provided on the side of the movable body 3.

(Support)
The support 2 includes a cover 11 and a holder 60, and the holder 60 and the movable body 3 are disposed inside the cover 11. The cover 11 has a first cover member 16 positioned on one side Z1 in the first direction Z, and a second cover member 17 overlapping the first cover member 16 from the other side Z2 in the first direction Z. The first cover member 16 has a rectangular first end plate portion 161 when viewed in the first direction Z, and a first side plate portion 162 which rises from the outer peripheral edge of the first end plate portion 161 to the other side Z2 in the first direction Z. Equipped with In addition, the second cover member 17 is a second side plate that rises from the outer peripheral edge of the second end plate portion 171 having a quadrangle and the outer edge of the second end plate portion 171 in the first direction Z when viewed in the first direction Z. A unit 172 is provided. In the first cover member 16 and the second cover member 17, the first side plate portion 162 and the second side plate portion 172 are in contact in the first direction Z, and are fixed by four screws 18.

At one diagonal position and the other diagonal position of the first cover member 16, bosses 12 are formed inside the first end plate 161 so as to protrude toward the second cover member 17. The boss portion 12 includes a step surface 12a formed at an intermediate position in the first direction Z, and a cylindrical portion 12b protruding from the step surface 12a in the first direction Z2 in the Z direction. The screws 18 are inserted into screw holes 12 c formed at diagonal positions of the second end plate portion 171 and screwed to the cylindrical portion 12 b.

The second cover member 17 is formed with a notch 13 in which the side surface on one side X1 in the second direction X of the second side plate portion 172 is cut out on the other side Z2 in the first direction Z. Further, the first side plate portion 162 of the first cover member 16 is formed with a rising portion 14 that faces the notch 13 of the second cover member 17 in the first direction Z. The rising portion 14 constitutes a slit for disposing the wiring board 15 between itself and the notch 13. A feeder line or the like to the coil 7 is connected to the wiring board 15.

FIG. 4 is an exploded perspective view of the movable body 3 and the holder 60. As shown in FIG. As shown in FIGS. 3 and 4, the holder 60 is a quadrangle as viewed in the first direction Z, and circular holes 609 are opened at the four corners of the holder 60. The holder 60 is held at a position where the cylindrical portion 12b of the boss 12 is inserted into the circular hole 609 and placed on the step surface 12a. The holder 60 includes a first holder 61 and a second holder 62 that abuts the first holder 61 from the other side Z2 in the first direction Z. The second holder 62 is formed substantially symmetrically in the first direction Z with respect to the first holder 61.

At the centers of the four sides of the first holder 61 and the second holder 62, a recessed portion 650 recessed toward the inner peripheral side is formed. As shown in FIG. 3, the

coils

71 and 72 of the first magnetic drive circuit 6X are held inside the two recesses 650 opposed in the second direction X. In addition, the

coils

73 and 74 of the second magnetic drive circuit 6Y are held inside the two concave portions 650 opposed in the third direction Y. As shown in FIG. 4, the

coils

71 and 72 are flat air core coils whose long sides 701 serving as effective sides extend in the third direction Y, and the

coils

73 and 74 have long sides 701 serving as effective sides. Is a flat air core coil extending in the second direction X. The

coils

71 and 72 and the

coils

73 and 74 are held in an oval coil holding hole 66 (see FIG. 4) formed in the first holder 61 and the second holder 62.

(Movable body)
FIG. 5 is a perspective view of the movable body 3 and the coil 7. The movable body 3 includes a yoke 30 made of a magnetic plate and a magnet 8 fixed to the yoke 30. As shown in FIGS. 2 and 5, the yoke 30 includes a first yoke 31, a second yoke 32 disposed on the other side Z2 in the first direction Z of the first yoke 31, and a first yoke of the second yoke 32. The third yoke 33 disposed on the other side Z2 of the direction Z is provided. Also. The yoke 30 includes a connecting member 34 that positions and connects the first yoke 31, the second yoke 32, and the third yoke 33 in the first direction Z. The connecting member 34 is joined to the first yoke 31, the second yoke 32, and the third yoke 33 by welding or the like.

As shown in FIGS. 2 and 5, a shaft portion 35 extending in the first direction Z is attached to a central portion 301 of the first yoke 31, the second yoke 32, and the third yoke 33. The shaft portion 35 is passed through a circular hole 651 formed at the center of the first holder 61 and the second holder 62 (see FIG. 4). The shaft portion 35 is connected to a first shaft portion 351 disposed between the first yoke 31 and the second yoke 32, and the other side Z2 of the first shaft portion 351 in the first direction Z, A second shaft portion 352 disposed between the third yokes 33 is provided. The end portions of the first shaft portion 351 and the second shaft portion 352 are fitted in circular holes 302 formed in the central portion 301 of the first yoke 31, the second yoke 32, and the third yoke 33.

As shown in FIGS. 2 and 5, the first yoke 31, the second yoke 32, and the third yoke 33 are plate-like members perpendicular to the first direction Z, and are identical when viewed from the first direction Z. It is a shape. The first yoke 31, the second yoke 32, and the third yoke 33 are cruciform when viewed from the first direction Z. The first yoke 31, the second yoke 32, and the third yoke 33 respectively have a central portion 301 in which the circular hole 302 is formed, and a first portion projecting from the central portion 301 to one side X1 and the other side X2 in the second direction X. The first arm 310 and the second arm 320, and the third arm 330 and the fourth arm 340 which protrude from the central portion 301 to the one side Y1 and the other side Y2 in the third direction Y are provided. The first arm 310 and the second arm 320 extend in the second direction X, and the third arm 330 and the fourth arm 340 extend in the third direction Y.

The yoke 30 is an assembly in which the first yoke 31, the second yoke 32, the third yoke 33, and the connecting member 34 are joined by welding or the like. The four arms of the three yokes overlap when viewed in the first direction Z, and the tips of the overlapping arms when viewed in the first direction Z are connected by the connecting member 34. The connecting member 34 includes a first connecting member 341 that connects the tip (end) of the first arm 310 of the first yoke 31, the second yoke 32, and the third yoke 33, and a tip (an end of the second arm 320). Section), the third connection member 343 for connecting the tip (end) of the third arm 330, and the fourth connection for connecting the tip (end) of the fourth arm 340. It consists of a member 344. Each connecting member 34 extends in the first direction Z. The end of the first yoke 31 is joined substantially perpendicularly to the end of the one side Z1 in the first direction Z of each connecting member 34, and the third yoke 33 is substantially perpendicular to the end of the other side Z2 of the first direction Z Bonded to Further, the end of the second yoke 32 is joined substantially at right angles to the central portion in the first direction Z.

In each of the first yoke 31, the second yoke 32, and the third yoke 33, the width direction of the tip (end) of the first arm 310, the second arm 320, the third arm 330, and the fourth arm 340 A recess 303 is formed in the center of the and a protrusion 304 is formed on both sides in the width direction of the recess 303. Also, in each connecting member 34 (the first connecting member 341, the second connecting member 342, the third connecting member 343, and the fourth connecting member 344), a concave portion 305 is cut out at a position corresponding to the convex portion 304 of each yoke. Is formed. That is, in each connecting member 34, concave portions 305 are formed at both ends in the width direction at three ends in the first direction Z and at an intermediate position in the first direction Z, respectively. The first yoke 31, the second yoke 32, and the third yoke 33 are connected to a convex portion 304 formed at the tip of the first arm 310, the second arm 320, the third arm 330, and the fourth arm 340. The yokes are fitted and welded in the recesses 305 of the member 34, and the respective yokes are joined to the connecting member 34 substantially at right angles. A configuration may be adopted in which the convex portion formed in the connecting member 34 and the concave portion formed in the first yoke 31, the second yoke 32, and the third yoke 33 are fitted.

In the first yoke 31, the second yoke 32, and the third yoke 33, the tip of the first arm 310 overlaps the first connecting member 341 when viewed from the second direction X, and the tip of the second arm 320 is As viewed in the second direction X, the second connection member 342 overlaps the second connection member 342. Further, the tip of the third arm 330 overlaps the third connecting member 343 when viewed from the third direction Y, and the tip of the fourth arm 340 with the fourth connecting member 344 when viewed from the third direction Y. overlapping. When the convex portion 304 of the first yoke 31 is fitted to the concave portion 305 of the connecting member, the surface of the one side Z1 in the first direction Z of the first yoke 31 is the end surface of the one side Z1 in the first direction Z of the connecting member 34 And is positioned in the first direction Z so as to be on the same plane. Further, when the convex portion 304 of the third yoke 33 is fitted to the concave portion 305 of the connecting member, the surface of the other side Z2 in the first direction Z of the third yoke 33 is the other side Z2 of the connecting member 34 in the first direction Z. It is positioned in the first direction Z so as to be on the same plane as the end face of the lens. That is, the yoke 30 is assembled such that the height of the connecting member 34 in the first direction Z coincides with the height of the yoke 30 in the first direction Z.

FIG. 6 is a plan view of the movable body 3 and the holder 60. FIG. The outer shape of the yoke 30 as viewed in the first direction Z is smaller than that of the holder 60. The yoke 30 is disposed movably with respect to the holder 60 in the second direction X and the third direction Y, and the connection member 34 is disposed in the recess 650 of the holder 60. When the movable body 3 and the holder 60 are disposed inside the cover 11, the connecting member 34 is disposed in the gap between the recess 650 of the holder 60 and the second side plate portion 172 of the second cover member 17 (FIGS. 2 and 6) reference).

As shown in FIG. 3, FIG. 4 and FIG. 6,

prisms

660 X and 660 Y extending in the first direction Z are formed on the edges of both ends of the recess 650 in the width direction of the holder 60. In the concave portions 650 on both sides in the second direction X of the holder 60, two prismatic column portions 660Y facing each other in the third direction Y with the first connecting member 341 and the second connecting member 342 interposed therebetween are formed. Therefore, when the movable body 3 moves in the third direction Y, the movable range of the movable body 3 in the third direction Y is restricted by the prism portion 660Y. Further, in the concave portions 650 on both sides in the third direction Y of the holder 60, two prismatic portions 660X facing each other in the second direction X with the third connecting member 343 and the fourth connecting member 344 interposed therebetween are formed. Therefore, when the movable body 3 moves in the second direction X, the movable range of the movable body 3 in the second direction X is restricted by the prism portion 660X. The movable range of the movable body 3 restricted by the

prismatic portions

660X and 660Y is a range in which the movable body 3 does not collide with the inner surface of the second cover member 17.

As shown in FIG. 2, the first yoke 31 is disposed between the first holder 61 and the first cover member 16. The second yoke 32 is disposed between the first holder 61 and the second holder 62, and the third yoke 33 is disposed between the second holder 62 and the second cover member 17. As shown in FIG. 4, the magnet 8 is a magnet facing the coil 71 of the first magnetic drive circuit 6X in the first direction Z, and a magnet facing the coil 72 of the first magnetic drive circuit 6X in the first direction Z A magnet 82 faces the coil 73 of the second magnetic drive circuit 6Y in the first direction Z, and a magnet 84 faces the coil 74 of the second magnetic drive circuit 6Y in the first direction Z. In this embodiment, the

magnets

81, 82, 83, 84 are disposed on the one side Z1 and the other side Z2 of the

coils

71, 72, 73, 74 in the first direction Z, and on both sides of each coil 7 in the first direction Z. A magnet 8 is arranged. That is, the magnet 8 is provided on the other surface of the first yoke 31 in the first direction Z, both surfaces of the second yoke 32 in the first direction Z, and the surface of the third yoke on the one side Z1 in the first direction Z It is fixed. When the magnets 8 face the coil 7 from both sides in the first direction Z, the magnetic flux leakage can be reduced and the driving force can be increased.

The magnet 81 is fixed to the first arm portion 310 of the first yoke 31, the second yoke 32, and the third yoke 33, and the magnet 82 is the second arm of the first yoke 31, the second yoke 32, and the third yoke 33. The magnet 83 is fixed to the portion 320, and the magnet 83 is fixed to the third arm 330 of the first yoke 31, the second yoke 32, and the third yoke 33. The magnet 84 is fixed to the first yoke 31, the second yoke 32, the third. It is fixed to the fourth arm 340 of the yoke 33. Each magnet 8 is polarized and magnetized in the thickness direction. Further, the two magnets 8 facing each coil 7 on one side Z1 and the other side Z2 in the first direction Z are magnetized in poles different in the surface facing the coil 7.

(Viscoelastic member)
As shown in FIG. 2, in the actuator 1, the visco-elastic member 9 is disposed at a position where the support 2 and the movable body 3 face in the first direction Z. In this embodiment, as the visco-elastic member 9, the first visco-elastic member 91 is disposed at a position where the first yoke 31 of the movable body 3 and the first cover member 16 of the support 2 face in the first direction Z A second visco-elastic member 92 is disposed at a position where the third yoke 33 of the body 3 and the second cover member 17 of the support 2 face in the first direction Z. In the first viscoelastic member 91, the first arm 310, the second arm 320, the third arm 330, and the fourth arm 340 of the first yoke 31 and the first cover member 16 face each other in the first direction Z. One in each of the four locations. In the second viscoelastic member 92, the first arm 310, the second arm 320, the third arm 330, the fourth arm 340, and the second cover member 17 of the third yoke 33 extend in the first direction Z. It is arranged one by one at four places facing the.

As shown in FIGS. 2 and 3, the first cover member 16 is formed with a recess 163 that is recessed on one side Z <b> 1 in the first direction Z. The concave portion 163 is opposed to the center of the first end plate portion 161 in the third direction Y at two locations opposed in the second direction X, and the center of the first end plate portion 161 in the second direction X opposed to the third direction Y It is formed in four places of two places. The first visco-elastic member 91 is held one by one in these four recessed portions 163, and connects the first yoke 31 and the first cover member 16 in the first direction Z at four points. Also in the second end plate portion 171 of the second cover member 17, concave portions 173 recessed in the other side Z2 in the first direction Z are formed at four places, and the second viscoelastic member 92 The three yokes 33 and the second cover member 17 are connected in the first direction Z at four locations.

The first viscoelastic member 91 and the second viscoelastic member 92 have a quadrangular shape when viewed in the first direction Z, and are arranged with the first direction Z as a thickness direction. The dimensions of the second viscoelastic member 92 in the second direction X are the same as the dimensions in the third direction Y. The first viscoelastic member 91 is disposed between the first yoke 31 and the first cover member 16 in a compressed state in the first direction Z, and the second viscoelastic member 92 includes the third yoke 33 and the second It is arranged in a state of being compressed in the first direction Z between the cover member 17 and the cover member 17. The first viscoelastic member 91 and the second viscoelastic member 92 are adhered to the surface in contact with the support 2 and the surface in contact with the movable body 3.

Here, the viscoelasticity is a property in which both the viscosity and the elasticity are combined, and is a property which is remarkably observed in high-molecular substances such as gel-like members, plastics and rubbers. Therefore, various gel-like members can be used as the viscoelastic member 9 (the first viscoelastic member 91 and the second viscoelastic member 92). Also, as the viscoelastic member 9, natural rubber, diene rubber (for example, styrene butadiene rubber, isoprene rubber, butadiene rubber), chloroprene rubber, acrylonitrile butadiene rubber, etc., non-diene rubber (for example, butyl rubber, ethylene) Various rubber materials such as propylene rubber, ethylene / propylene / diene rubber, urethane rubber, silicone rubber, fluororubber, etc., thermoplastic elastomers and their modified materials may be used. In the present embodiment, the viscoelastic member 9 (the first viscoelastic member 91 and the second viscoelastic member 92) is a silicone-based gel having a penetration of 10 degrees to 110 degrees. The degree of penetration is defined in IS-K-2207 and JIS-K-2220, and the smaller the value, the harder it is.

The viscoelastic member 9 has linear or non-linear expansion and contraction characteristics depending on the expansion and contraction direction. For example, when the visco-elastic member 9 is pressed in the thickness direction (axial direction) to be compressively deformed, the visco-elastic member 9 has an expansion and contraction characteristic in which a non-linear component (spring coefficient) is larger than a linear component (spring coefficient). On the other hand, when it is pulled and extended in the thickness direction (axial direction), it has an expansion and contraction characteristic in which a linear component (spring coefficient) is larger than a non-linear component (spring coefficient). In addition, also in the case of deformation in the direction (shear direction) intersecting the thickness direction (axial direction), the deformation is in the direction of pulling and extending, so a linear component (spring coefficient) than a nonlinear component (spring coefficient) Has large deformation characteristics. Accordingly, in the visco-elastic member 9, the spring force in the movement direction is constant. Therefore, by using the spring element in the shear direction of the visco-elastic member 9, the reproducibility of the vibration acceleration with respect to the input signal can be improved, so that the vibration can be realized with a subtle nuance.

In the present embodiment, the viscoelastic member 9 intersects the thickness direction (first direction Z) when the movable body 3 moves in the direction (second direction X, third direction Y) orthogonal to the first direction Z. It is attached so as to be deformed in the shear direction (second direction X, third direction Y). Therefore, when the movable body 3 moves in a direction (second direction X, third direction Y) orthogonal to the first direction Z, the linear component of the visco-elastic member 9 uses a large deformation characteristic so that vibration with respect to the input signal is used. The repeatability of acceleration is good, and vibrations can be realized with subtle nuances. Therefore, the vibration to be expressed can be easily made. Further, when a force to move the movable body 3 in the first direction Z is applied, one of the first viscoelastic member 91 and the second viscoelastic member 92 is compressively deformed, so that the nonlinear component of the viscoelastic member 9 Is used, and the positional change of the movable body 3 can be suppressed.

The planar shape of the first viscoelastic member 91 and the second viscoelastic member 92 may be polygonal other than quadrilateral or circular. In the case of a rectangular shape, it is low in cost because the yield at the time of manufacture is the best. However, in consideration of the resonance characteristic of the movable body 3 when driving the actuator 1, it is desirable to make the first viscoelastic member 91 and the second viscoelastic member 92 circular.

(basic action)
In the actuator 1 of this embodiment, when an alternating current is applied to the

coils

71 and 72 of the first magnetic drive circuit 6X, the movable body 3 vibrates in the second direction X, so the center of gravity in the actuator 1 fluctuates in the second direction X . Therefore, the user can sense the vibration in the second direction X. In addition, when an alternating current is applied to the

coils

73 and 74 of the second magnetic drive circuit 6Y, the movable body 3 vibrates in the third direction Y, so the center of gravity of the actuator fluctuates in the third direction Y. For this reason, the user can experience vibration in the third direction Y. Further, by adjusting the AC waveform applied to the coil 7, the acceleration at which the movable body 3 moves to one side X1 in the second direction X is different from the acceleration at which the movable body 3 moves to the other side X2 in the second direction. Then, the user can feel the vibration having the directivity in the second direction X. Similarly, vibration having directivity in the third direction Y can be felt.

(Main effects of this form)
As described above, in the actuator 1 of this embodiment, the side (movable body 3) of the support 2 and the movable body 3 on which the magnet 8 of the magnetic drive circuit 6 is provided includes the yoke 30, A plurality of yokes 30 opposed in the first direction Z are positioned in the first direction Z by the connecting member 34. That is, the coils 7 are arranged in two stages on the support 2, and the yoke 30 for holding the magnet 8 has a three-stage configuration including the first yoke 31, the second yoke 32, and the third yoke 33. As described above, when all the yokes are positioned with respect to the connecting member 34, it is possible to suppress that the component tolerances of the plurality of yokes build up and the dimensional accuracy of the entire yoke 30 in the first direction decreases. Therefore, reduction in the dimensional accuracy of the movable body 3 in the first direction Z can be suppressed, and reduction in the positional accuracy of the movable body 3 in the first direction Z relative to the support 2 can be suppressed. Therefore, the movable body 3 can be driven properly.

In the present embodiment, the first yoke 31, the second yoke 32, and the third yoke 33 are connected substantially at right angles to the connection member 34, and the first yoke 31, the second yoke 32, and the third yoke 33 are When viewed in the direction orthogonal to the first direction Z, the connecting member 34 is overlapped. Therefore, since the height of the connecting member 34 in the first direction Z becomes the height of the yoke 30 in the first direction Z, the component tolerance of the connecting member 34 and the components of the first yoke 31, the second yoke 32, and the third yoke 33 It is possible to suppress that the tolerance is accumulated and the dimensional accuracy of the entire yoke 30 in the first direction Z is reduced.

In the first yoke 31, the second yoke 32, and the third yoke 33 of the present embodiment, a convex portion 304 is formed at an end portion connected to the connecting member 34, and the connecting member 34 is a concave portion to be fitted with the convex portion 304. 305 are formed. Therefore, the yokes and the connecting members 34 can be positioned by fitting the convex portions 304 and the concave portions 305.

In the present embodiment, the connecting member 34 includes a plurality of arms (a first arm 310, a second arm 320, a third arm 330, a third arm 330, and a third yoke 33). The connecting member 34 is configured to connect the tips of overlapping arms when viewed from the first direction Z. Accordingly, the first yoke 31, the second yoke 32, and the third yoke 33 are connected at a plurality of connection points, and the dimensional accuracy of each connection point in the first direction Z is determined by the component tolerance of the connecting member 34. The decrease in dimensional accuracy in the first direction Z can be further reduced.

The actuator 1 of this embodiment includes a first magnetic drive circuit 6X that vibrates the movable body 3 in the second direction X, and a second magnetic drive mechanism 6Y that vibrates the movable body 3 in the third direction Y. The yoke 30 has a cross shape as viewed in the first direction Z, and a stopper mechanism is provided between the yoke 30 and the holder 60 to restrict the movable range of the movable body 3 in the second direction X and the third direction Y. ing. That is, the yoke 30 connects the first connecting member 341 that connects the first arm 310 that protrudes to one side X1 in the second direction X, and the second arm 320 that protrudes to the other side X2 in the second direction X. , And a third connecting member 343 connecting the third arm 330 projecting to one side Y1 in the third direction Y, and a fourth arm projecting to the other side Y2 in the third direction Y A fourth connecting member 344 connecting the portions 340 is provided. The four connection members 34 are disposed in the recess 650 of the holder 60, and the movable ranges of the connection member 34 in the second direction X and the third direction Y by

prisms

660X and 660Y provided at the edge of the recess 650. Is regulated. Therefore, when the movable body 3 moves in the second direction X and the third direction Y, the movable member 3 in the second direction and the third direction can be restricted by the connecting member 34 and the holder 60. Therefore, the impact resistance of the actuator 1 can be enhanced.

Although the present embodiment applies the present invention to the yoke 30 having a three-stage structure, the present invention can also be applied to an actuator provided with two or four or more stages of yokes.

DESCRIPTION OF SYMBOLS 1 ... Actuator, 2 ... Support body, 3 ... Movable body, 6 ... Magnetic drive circuit, 6X ... 1st magnetic drive circuit, 6Y ... 2nd magnetic drive circuit, 7 ... Coil, 8 ... Magnet, 9 ... Viscoelastic member, DESCRIPTION OF SYMBOLS 11 ... Cover, 12 ... Boss part, 12a ... Step surface, 12b ... Cylindrical part, 12c ... Screw hole, 13 ... Notch, 14 ... Rising part, 15 ... Wiring board, 16 ... 1st cover member, 17 ... 2nd Cover member, 18 screw, 30 yoke, 31 first yoke 32 32 second yoke 33 33 third yoke 34 coupling member 35 shaft portion 60 holder 61 first holder 62 ... second holder, 66 ... coil holding hole, 71, 72, 73, 74 ... coil, 81, 82, 83, 84 ... magnet, 91 ... first viscoelastic member, 92 ... second viscoelastic member, 161 ... first 1 end plate portion, 162 ... first side plate portion, 163 ... concave portion, 171 ... first End plate portion 172: second side plate portion 173: concave portion 301: central portion 302: circular hole 303: concave portion 304: convex portion 305: concave portion 310: first arm portion 320: second arm Part 330 330 third arm 340 fourth arm 341 first connecting member 342 second connecting member 343 third connecting member 344 fourth connecting member 351 first shaft , 352: second shaft portion, 609: circular hole, 650: recess, 651: circular hole, 660X: prismatic portion, 660Y: prismatic portion, 701: long side, X: second direction, Y: third direction, Z ... first direction

Claims

A support,
A movable body movably supported by the support;
And a magnetic drive circuit for moving the movable body relative to the support.
The magnetic drive circuit is provided on a coil provided on one side member of the support and the movable body, and on the other side member of the support and the movable body in the first direction. An opposing magnet, and driving the movable body in a second direction intersecting the first direction,
The other side member includes: a plurality of yokes including a first yoke and a second yoke opposed in the first direction; and a connecting member for positioning and connecting the plurality of yokes in the first direction. Characterized actuator.
The plurality of yokes include a third yoke that faces in the first direction on the side opposite to the first yoke with respect to the second yoke,
The coil is disposed between the first yoke and the second yoke, and between the second yoke and the third yoke.
The magnet is fixed to a surface of the first yoke, the second yoke, and the third yoke facing the coil.
The actuator according to claim 1, wherein the connection member positions and connects the first yoke, the second yoke, and the third yoke in the first direction.
The actuator according to claim 1, wherein the plurality of yokes overlap the connecting member when viewed in a direction orthogonal to the first direction.
The plurality of yokes include an end coupled to the connection member,
The actuator according to claim 3, wherein a convex portion is formed on one of the connecting member and the end portion, and a concave portion that fits with the convex portion is formed on the other.
The actuator according to any one of claims 1 to 4, wherein ends of the plurality of yokes are fixed by the connection member by welding.
Each of the plurality of yokes includes a plurality of arms projecting in a plurality of directions,
The actuator according to any one of claims 1 to 5, wherein the connecting member connects the tips of the arm portions overlapping each other when viewed from the first direction.
The magnetic drive circuit drives the movable body in a second direction and a third direction intersecting the second direction.
The plurality of arms are a first arm projecting to one side in the second direction, a second arm projecting to the other side in the second direction, and a second projecting to the one side in the third direction. 3 arms and a fourth arm projecting to the other side in the third direction,
The connecting member includes a first connecting member connecting the first arm, a second connecting member connecting the second arm, a third connecting member connecting the third arm, and the fourth connecting member. A fourth connecting member for connecting the arms;
The one side member comprises a holder for holding the coil,
The holder restricts the movable range of the first connecting member and the second connecting member in the third direction, and restricts the movable range of the third connecting member and the fourth connecting member in the second direction. The actuator according to claim 6, characterized in that:
The one side member is the support,
The actuator according to any one of claims 1 to 7, wherein the other side member is the movable body.