CN111921828B

CN111921828B - Vibration generating device

Info

Publication number: CN111921828B
Application number: CN202010395239.9A
Authority: CN
Inventors: 前田征宣; 铃木克俊
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 2019-05-13
Filing date: 2020-05-12
Publication date: 2022-02-11
Anticipated expiration: 2040-05-12
Also published as: CN111921828A; JP2020185516A; JP7240948B2

Abstract

The invention provides a vibration generating device which is small and can obtain strong vibration. The vibration generating device comprises: a housing; a vibrating body formed of a magnet, an upper yoke provided on an upper side of the magnet, and a lower yoke provided on a lower side of the magnet; and a coil that is provided between the upper yoke and the magnet and is fixed to the case, wherein the vibration generating device vibrates the vibrator by flowing an alternating current through the coil, wherein a recess is provided in the upper yoke or the lower yoke, the magnet is attached to a bottom surface of the recess, and the lower yoke and the upper yoke are joined to each other in an extended region that is formed long in a vibration direction of the vibrator.

Description

Vibration generating device

Technical Field

The present invention relates to a vibration generating apparatus.

Background

In portable electronic devices such as mobile phones and game machines, there are electronic devices in which a vibration generating device is mounted to notify a user of an incoming call to the phone by vibration or to provide a tactile sensation according to the progress of a game. Such a vibration generating device is used for portable electronic equipment, and therefore, miniaturization is required. For example, as such a vibration generating device, the following vibration generating device is disclosed: springs are provided on the left and right sides of a weight having a permanent magnet attached thereto, a coil is provided at a position facing the magnet, and a current is passed through the coil, whereby the weight sandwiched between the left and right springs is vibrated to generate vibration (for example, patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2015-44177

Patent document 2: japanese patent laid-open publication No. 2019-13094

Disclosure of Invention

Among the vibration generators described above, a small-sized vibration generator having strong vibration is required.

According to an aspect of the present embodiment, a vibration generating apparatus includes: a housing; a vibrating body formed of a magnet, an upper yoke provided on an upper side of the magnet, and a lower yoke provided on a lower side of the magnet; and a coil that is provided between the upper yoke and the magnet and is fixed to the case, wherein the vibration generating device vibrates the vibrator by flowing an alternating current through the coil, wherein a recess is provided in the upper yoke or the lower yoke, the magnet is attached to a bottom surface of the recess, and the lower yoke and the upper yoke are joined to each other in an extended region that is formed long in a vibration direction of the vibrator.

Effects of the invention

According to the disclosed vibration generating device, a small-sized vibration generating device can obtain a strong vibration.

Drawings

Fig. 1 is a perspective view of a vibration generating device in the present embodiment.

Fig. 2 is an exploded perspective view of the vibration generating device in the present embodiment.

Fig. 3 is a perspective view of a housing of the vibration generating device in the present embodiment.

Fig. 4 is a plan view of the housing of the vibration generating device according to the present embodiment.

Fig. 5 is a perspective view of the coil and the bracket of the vibration generating device in the present embodiment.

Fig. 6 is an exploded perspective view of a vibrator of the vibration generating device in the present embodiment.

Fig. 7 is a perspective view of the coil, the bracket, and the vibrator of the vibration generating device according to the present embodiment.

Fig. 8 is a front view of the coil, the bracket, and the vibrator of the vibration generating device according to the present embodiment.

Fig. 9 is a perspective view of an elastic member of the vibration generating device in the present embodiment.

Fig. 10 is an explanatory diagram of an elastic member of the vibration generating device in the present embodiment.

Fig. 11 is an explanatory diagram of the magnetic field generated in the vibration generating device of the present embodiment.

Fig. 12 is a front view of the vibration generating device in the present embodiment.

Fig. 13 is an explanatory diagram of the vibration generating device in the present embodiment.

Fig. 14 is a schematic configuration diagram of the vibration generating device in the present embodiment.

Fig. 15 is a schematic configuration diagram of a vibration generating device for comparison.

Fig. 16 is a schematic configuration diagram of a modification of the vibration generating device in the present embodiment.

Detailed Description

The following describes embodiments for implementation. The same components and the like are denoted by the same reference numerals, and description thereof is omitted. In the present application, the directions X1 to X2, Y1 to Y2, and Z1 to Z2 are orthogonal to each other. Further, a plane including the X1-X2 direction and the Y1-Y2 direction is referred to as an XY plane, a plane including the Y1-Y2 direction and the Z1-Z2 direction is referred to as a YZ plane, and a plane including the Z1-Z2 direction and the X1-X2 direction is referred to as a ZX plane.

The vibration generating device of the present embodiment will be described with reference to fig. 1 and 2. Fig. 1 is a perspective view of a vibration generating device according to the present embodiment, and fig. 2 is an exploded perspective view. The vibration generating device of the present embodiment includes a cover 10, an upper yoke 20, a coil 30, a bracket 40, a magnet 50, a lower yoke 60, an elastic member 70, a case 80, and the like. In the present embodiment, the lid 10, the bracket 40, the elastic member 70, and the case 80 are formed of nonmagnetic stainless steel, and the upper yoke 20 and the lower yoke 60 are formed of a magnetic material containing Fe or the like.

As shown in fig. 1, the vibration generating device of the present embodiment has a substantially rectangular parallelepiped shape in appearance, and the area of a plane parallel to the XY plane is the largest. The vibration generating device is formed, for example, in such a manner that the length of the largest surface area in the X1-X2 direction (longitudinal direction) is 15mm, the length in the Y1-Y2 direction (width direction) is 10mm, and the height in the Z1-Z2 direction (height direction) is 3mm, and is compact.

The housing 80 and the lid 10 form a housing portion of the vibration generating device in the present embodiment. As shown in fig. 3 and 4, the housing 80 is formed in a substantially rectangular frame shape, and has an opening 81 penetrating in the Z1-Z2 direction, and a bottom plate 82 parallel to the XY plane is formed on the Y2 side of the Z2 side. Further, a bracket support portion 83 is provided at the center portion of the housing 80 on the Y1 side and the Y2 side.

Elastic member 70, lower yoke 60, magnet 50, bracket 40, coil 30, and upper yoke 20 are incorporated into case 80, and cover 10 is covered from the side Z1 which is the upper side. In the present application, the case 80 or a housing portion formed by the lid 10 and the case 80 may be referred to as a housing.

As shown in fig. 5, the coil 30 is wound so as to be long in the Y1-Y2 direction, and has

terminals

31 and 32 for passing current. The coil 30 is fixed in a state of being placed on the surface 40a on the Z1 side of the bracket 40, and the case mounting portion 41 for connecting to the case 80 is formed on the Y1 side and the Y2 side of the bracket 40 so as to extend in the Z2 direction. The bracket 40 is formed by punching and bending a metal plate such as nonmagnetic stainless steel.

As shown in fig. 6, the upper yoke 20 is formed in a rectangular flat plate shape in which the X1-X2 direction is the longitudinal direction and the Y1-Y2 direction is the width direction. The lower yoke 60 has a recess 61 recessed in the Z2 direction, with the X1-X2 direction being the longitudinal direction. A side surface 61b extending in the Z1 direction is formed at an end portion on the X1 side and an end portion on the X2 side of the bottom surface 61a of the recess 61 of the lower yoke 60, and further, a connecting portion 62 extending in the X1 direction and the X2 direction is formed at an outer side of both the side surfaces 61b in the X1 direction and the X2 direction. In the magnet 50, the X1 side is the S pole, the X2 side is the N pole, and the X1 side is the N pole, and the X2 side is the S pole, among the surfaces on the Z1 side.

In assembling the vibrating body of the vibration generating device according to the present embodiment, the magnet 50 is joined to the bottom surface 61a of the recess 61 of the lower yoke 60, and the connection portion 62 of the lower yoke 60 is further joined to the upper yoke 20. In the present embodiment, the lower yoke 60 and the upper yoke 20 surrounding the magnet 50 are separate members, and therefore, are easily assembled.

As shown in fig. 7 and 8, the surface of the magnet 50 on the Z2 side is joined to the bottom surface 61a of the recess 61 of the lower yoke 60, and the surfaces of the connecting portions 62 on the X1 side and the X2 side of the lower yoke 60 on the Z1 side are joined to the connecting portions 21 of the upper yoke 20. Further, the coil 30 fixed to the bracket 40 is provided at a position on the Z1 side of the magnet 50 inside the region surrounded by the lower yoke 60 and the upper yoke 20 formed by the recess 61 of the lower yoke 60.

Bracket 40 is attached by housing attachment portion 41 provided in bracket 40 being fitted into an opening portion of bracket support portion 83 provided in housing 80. Therefore, although the upper yoke 20, the magnet 50, and the lower yoke 60 form a vibrating body, the vibrating body is not connected to the bracket 40 and the coil 30.

As shown in fig. 9, the elastic member 70 includes a case connecting portion 71, a vibrator supporting portion 72, and a spring portion 73. The case connection portion 71 is fixed by connecting the surface on the Z2 side to the surface on the Z1 side of the bottom plate portion 82 of the case 80. The Z2 side of the vibrator formed by the upper yoke 20, the magnet 50, and the lower yoke 60 is joined and fixed to the Z1 side surface of the vibrator support 72. The spring portion 73 is provided between the case connecting portion 71 and the vibrator supporting portion 72.

The elastic member 70 is first formed by punching a metal plate of non-magnetic stainless steel, for example, a metal plate of non-magnetic stainless steel having a thickness of 0.1mm, into a metal plate in a punched state as shown in fig. 10. After that, the punched metal plate is bent to form the elastic member 70 as shown in fig. 9. The spring portion 73 is formed by bending both sides of the punched metal plate shown in fig. 10 on the X1 side and the X2 side substantially perpendicularly to the Z1 direction at a bending line 70a (the bending line 70a is shown in fig. 9) parallel to the Y1-Y2 direction. Therefore, in the elastic member 70, the case connecting portion 71 and the vibrator supporting portion 72 are flush with each other.

A groove 74 is formed in the metal plate for forming the elastic member 70 by punching, and the case connection portion 71 and the vibrator support portion 72 are separated by a first groove region 74a of the groove 74. The first groove region 74a of the groove 74 is formed long in the X1-X2 direction and orthogonal to the Y1-Y2 direction which is the extending direction of the bending line 70 a. Thus, the case connection portion 71 is formed on the Y2 side of the first groove region 74a of the groove 74, and the vibrator support portion 72 is formed on the Y1 side.

Further, the spring portion 73 is formed substantially parallel to the YZ plane, and the second groove region 74b of the groove 74 formed long in the Y1-Y2 direction is formed, whereby desired elasticity can be obtained. The spring portion 73 is connected to the case connecting portion 71 and has a first region 73a extending from the case connecting portion 71 in the Z1 direction; a second region 73b extending long in the Y1 direction from the first region 73 a; a third region 73c extending from the second region 73b in the Z2 direction; and a fourth region 73d connecting the third region 73c to the vibrator supporting member 72 and partially extending in the Y1-Y2 direction. The second region 73b and the fourth region 73d are separated by a second groove region 74b of the groove 74 which is long in the Y1-Y2 direction, and the second region 73b is formed long in the Y1-Y2 direction, and this portion functions particularly as a spring. Therefore, the second region 73b of the spring portion 73 is formed long in the direction parallel to the bending line 70 a.

Further, when a metal plate is bent to form an elastic member such as a spring, it is difficult to manufacture the metal plate by bending at an angle close to 180 °, and the bent portion is easily broken or the like at the time of vibration because the strength of the bent portion is low. Therefore, in the present embodiment, the elastic member 70 is formed by performing bending processing at approximately 90 ° in order to facilitate manufacturing and prevent a decrease in strength. This facilitates manufacture of the vibration generating device and improves reliability.

A vibrator is joined to the vibrator support 72, and a bent portion 75 formed by bending a part of the vibrator support 72 substantially perpendicularly in the Z1 direction is provided on the X1 side and the X2 side of the vibrator. The bent portion 75 may be used as a mark for positioning when the vibrator is joined to the vibrator support portion 72, or may be used as a support portion for supporting the X1 side and the X2 side of the vibrator.

Next, the vibration of the vibration generating device in the present embodiment will be described. Fig. 11 shows a vibrating body formed by the upper yoke 20, the magnet 50, and the lower yoke 60 of the vibration generating device of the present embodiment, and the coil 30 and the bracket 40 provided in the space surrounded by the lower yoke 60 and the upper yoke 20. Magnetic lines of force are generated by the magnetic field of the magnet 50 as indicated by the dashed arrows in fig. 11. Fig. 12 is a front view of the vibration generating device according to the present embodiment.

Specifically, on the X1 side of the magnet 50, a space between the upper yoke 20 and the X1 side S pole of the magnet 50 passes through from the N pole on the Z2 side, inside the lower yoke 60 and the upper yoke 20, and enters the X1 side S pole of the magnet 50. Further, on the X2 side of the magnet 50, the space between the N pole on the X2 side of the magnet 50 and the upper yoke 20, the interiors of the upper yoke 20 and the lower yoke 60, from the N pole on the Z1 side, pass through, and then enter the S pole on the X2 side of the magnet 50. Further, on the Z1 side of the magnet 50, there are also magnetic lines of force that enter the S pole from the N pole on the Z1 side of the magnet 50, and on the Z2 side of the magnet 50, there are also magnetic lines of force that enter the S pole from the N pole on the Z2 side of the magnet 50.

Therefore, in the region surrounded by the upper yoke 20 and the lower yoke 60, the magnetic flux lines concentrate in the space between the upper yoke 20 and the magnet 50, the magnetic field becomes stronger, and the coil 30 is disposed in the space. In the present embodiment, the vibrator formed by the upper yoke 20, the magnet 50, and the lower yoke 60 can be vibrated in the X1-X2 direction by passing an alternating current between the

terminals

31 and 32 of the coil 30.

For example, when a current flows so that the terminal 31 of the coil 30 is positive and the terminal 32 is negative, the vibrator formed by the upper yoke 20, the magnet 50, and the lower yoke 60 moves in the X2 direction. When a current flows so that the terminal 31 of the coil 30 is negative and the terminal 32 is positive, the vibrator formed by the upper yoke 20, the magnet 50, and the lower yoke 60 moves in the X1 direction. Therefore, by passing a current alternately between the positive and

negative terminals

31 and 32 of the coil 30, the vibrator formed by the upper yoke 20, the magnet 50, and the lower yoke 60 can be vibrated in the X1-X2 direction. Further, since the bracket 40 to which the coil 30 is attached is connected to the case 80 and is separated from the vibrator, the coil 30 and the bracket 40 do not vibrate.

However, the heavier the vibrating body, the stronger the vibration can be obtained. Therefore, the length of the connecting portion 62 of the lower yoke 60 and the connecting portion 21 of the upper yoke 20 connected to the connecting portion 62 of the lower yoke 60 in the X1-X2 direction is increased, and the weight of the vibrator is increased. In the present application, the connection portion 62 of the lower yoke 60 and the connection portion 21 of the upper yoke 20 to which the connection portion 62 is connected may be collectively referred to as an extension region 63. In the present embodiment, the length L in the X1-X2 direction in the extension setting region 63 is about 1.3mm, and the vibrator becomes heavy by the amount corresponding to the extension setting regions 63 provided on both sides. The thickness of the upper yoke 20 is 0.3mm, and the thickness of the lower yoke 60 is 0.5 mm. Therefore, the lower yoke 60 is thicker than the upper yoke 20.

In the present embodiment, the weight of the vibrator formed by the upper yoke 20, the magnet 50, and the lower yoke 60 is 1.03 g. When the vibrator is vibrated at 99Hz, which is a natural frequency, stroke lengths of ± 1.2mm and 2.4mm as a whole can be obtained in the X1-X2 directions, and strong vibration can be obtained. Fig. 13 shows a state in which the vibration generating device in the present embodiment is vibrated and the position of the vibrator is displaced. As shown in fig. 13, the second region 73b of the spring portion 73 of the elastic member 70 is largely deformed, and this portion serves as a main elastic region and functions as a spring.

The extension region 63 formed by the upper yoke 20 and the lower yoke 60 is preferably provided outside the recess 61 of the lower yoke 60 in the vibration direction. In the present embodiment, the vibration direction is the X1-X2 direction, but the bracket 40 supporting the coil 30 is connected to the housing 80 in the Y1-Y2 direction perpendicular to the vibration direction. Therefore, the extension setting region cannot be set to have a sufficient mass. Further, the height of the vibration generating device in the Z1-Z2 direction becomes high, and the demand for miniaturization cannot be satisfied. Therefore, the extension setting region 63 is set in the X1-X2 direction as the vibration direction.

The effects obtained by the vibration generating device of the present embodiment will be described based on a diagram with a simplified configuration. Fig. 14 is a simplified and schematic diagram showing the configuration of the vibration generating device according to the present embodiment. As shown in fig. 14, an elastic member 70 is provided between a vibrator formed by the upper yoke 20, the magnet 50, and the lower yoke 60 and the case 80, and the coil 30 is attached between the magnet 50 and the upper yoke 20. The extension region 63 is formed by a connection portion of the upper yoke 20 and the lower yoke 60.

Fig. 15 shows a vibration generating device having no extended region. In this vibration generating device, the vibrating body is formed by the magnet 50, the upper yoke 920, and the lower yoke 960, and the extension region as shown in fig. 14 is not provided. Therefore, the vibrating body formed by the upper yoke 20, the magnet 50, and the lower yoke 60 in the present embodiment shown in fig. 14 is heavier than the vibrating body formed by the magnet 50, the upper yoke 920, and the lower yoke 960 in the vibration generating device shown in fig. 15. Therefore, the vibration generating device of the present embodiment can obtain stronger vibration than the vibration generating device shown in fig. 15.

(modification example)

Next, a modification of the present embodiment will be described with reference to fig. 16. In the present modification, the extension region 162 of the lower yoke 160 is provided on the recess 161 side of the lower yoke 160. In this case, the extension region 162 may be extended in the X1-X2 direction as the vibration direction. However, since the coil 30 and the like are present inside the recess 161 of the lower yoke 160, there is a limit to extend the length of the extended region 162. Therefore, the configurations shown in fig. 14 and 1 to 13 are more preferable.

While the embodiments have been described in detail, the present invention is not limited to the specific embodiments, and various modifications and changes can be made within the scope of the claims.

Description of the reference numerals

10 cover body

20 upper side yoke

21 connecting part

30 coil

31. 32 terminal

40 bracket

41 housing mounting part

50 magnet

60 lower side yoke

61 recess

61a bottom surface

61b side surface

62 connecting part

63 extended setting area

70 elastic member

70a bending line

71 casing connecting part

72 vibrator supporting part

73 spring part

73a first region

73b second region

73c third region

73d fourth region

74 groove

74a first groove area

74b second groove area

75 bending part

80 casing

81 opening part

82 bottom plate part

83 bracket supporting part

Claims

1. A vibration generating device having:

a housing;

a vibrating body formed by a magnet, an upper yoke provided on an upper side of the magnet, and a lower yoke provided on a lower side of the magnet; and

a coil disposed between the upper yoke and the magnet and fixed to the case,

in the vibration generating device, the vibrator vibrates by passing an alternating current through the coil,

the vibration generating device is characterized in that,

a recess is provided in the upper yoke or the lower yoke, the magnet is mounted on a bottom surface of the recess,

the lower yoke and the upper yoke are joined to each other in an extended region formed long in a vibration direction of the vibrator,

the connection portion of the lower yoke extending outside the recess is joined to the connection portion of the upper yoke extending outside the recess.

2. The vibration generating apparatus according to claim 1,

the extension setting region extends to an outside of the recess.

3. The vibration generating apparatus according to claim 1,

a bracket is provided to support the coil, the bracket being connected to the housing in a direction orthogonal to the vibration direction.

4. The vibration generating apparatus according to claim 1,

the housing and the vibrator are connected by an elastic member formed of a metal.