CN111921828A - vibration generating device - Google Patents

Abstract

The present invention provides a small-sized vibration generating device capable of obtaining strong vibration. The vibration generating device has: a casing; a vibrating body formed of a magnet, an upper yoke provided on the upper side of the magnet, and a lower yoke provided on the lower side of the magnet; and a coil provided on the upper side Between the side yoke and the magnet and fixed to the housing, in the vibration generating device, the vibrating body vibrates by flowing an alternating current through the coil, and the vibration generating device is characterized in that: The upper yoke or the lower yoke is provided with a concave portion, the magnet is attached to the bottom surface of the concave portion, and the lower yoke and the upper yoke are located along the vibrating body. The extended area formed long in the vibration direction is joined.

Description

vibration generating device

technical field

The present invention relates to a vibration generating device.

Background technique

Some portable electronic devices such as mobile phones and game consoles are equipped with vibration generators in order to notify users of incoming calls by vibration or to provide a tactile sensation corresponding to the development of a game. Such vibration generating devices are used in portable electronic equipment, and therefore miniaturization is required. For example, as such a vibration generating device, a vibration generating device is disclosed in which a spring is provided on the left and right sides of a weight with permanent magnets, a coil is provided at a position facing the magnet, and a current flows through the coil, thereby Vibration is generated by vibrating the weight sandwiched between the left and right springs (for example, Patent Document 1).

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2015-44177

Patent Document 2: Japanese Patent Laid-Open No. 2019-13094

SUMMARY OF THE INVENTION

Among the above-mentioned vibration generating devices, a small-sized vibration generating device with strong vibration is required.

According to an aspect of the present embodiment, a vibration generating device includes: a casing; and a vibrating body consisting of a magnet, an upper yoke provided on an upper side of the magnet, and a lower magnet provided on a lower side of the magnet a yoke is formed; and a coil is provided between the upper yoke and the magnet and fixed to the housing, and in the vibration generating device, by causing an alternating current to flow through the coil, the vibrating body vibration, and the vibration generating device is characterized in that a concave portion is provided in the upper yoke or the lower yoke, the magnet is attached to a bottom surface of the concave portion, and the lower yoke is connected to the lower yoke. The upper yoke is joined in an extended region formed long in the vibration direction of the vibrating body.

Invention effect

According to the disclosed vibration generating device, small and strong vibration can be obtained.

Description of drawings

FIG. 1 is a perspective view of the 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 casing of the vibration generator in the present embodiment.

FIG. 4 is a plan view of the casing of the vibration generator of the present embodiment.

FIG. 5 is a perspective view of a coil and a bracket of the vibration generator in the present embodiment.

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

7 is a perspective view of a coil, a bracket, and a vibrating body of the vibration generating device in the present embodiment.

8 is a front view of a coil, a bracket, and a vibrating body of the vibration generating device in the present embodiment.

FIG. 9 is a perspective view of an elastic member of the vibration generator in the present embodiment.

FIG. 10 is an explanatory diagram of an elastic member of the vibration generator in the present embodiment.

FIG. 11 is an explanatory diagram of a magnetic field generated in the vibration generator of the present embodiment.

FIG. 12 is a front view of the vibration generating device in this 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 ways

Embodiments for implementation will be described below. In addition, the same code|symbol is attached|subjected to the same member etc., and description is abbreviate|omitted. In addition, in this application, the X1-X2 direction, the Y1-Y2 direction, and the Z1-Z2 direction are mutually orthogonal directions. In addition, the plane including the X1-X2 direction and the Y1-Y2 direction is described as the XY plane, the plane including the Y1-Y2 direction and the Z1-Z2 direction is described as the YZ plane, and the plane including the Z1-Z2 direction and the X1-X2 direction is described. The surface is described as the ZX surface.

The vibration generator of this embodiment will be described based on FIGS. 1 and 2 . FIG. 1 is a perspective view of the vibration generator of the present embodiment, and FIG. 2 is an exploded perspective view. The vibration generator 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 body 10 , the bracket 40 , the elastic member 70 , and the case 80 are formed of non-magnetic stainless steel, and the upper yoke 20 and the lower yoke 60 are formed of a magnetic material including Fe or the like.

As shown in FIG. 1 , the vibration generator of the present embodiment is formed in a substantially rectangular parallelepiped shape, and the area of the surface parallel to the XY plane is the largest. For example, the vibration generator has a surface with the largest area having a length in the X1-X2 direction (length direction) of 15 mm, a length in the Y1-Y2 direction (width direction) of 10 mm, and a height in the Z1-Z2 direction (height direction) of 3 mm. way to form, is small.

The casing 80 and the cover 10 form the frame portion of the vibration generating device in this embodiment. As shown in FIGS. 3 and 4 , the casing 80 is formed in a substantially rectangular frame shape, and an opening 81 penetrating in the Z1-Z2 direction is formed, and a bottom plate 82 parallel to the XY plane is formed on the Y2 side on the Z2 side. . Moreover, the bracket support part 83 is provided in the center part on the Y1 side and the Y2 side of the casing 80. As shown in FIG.

The elastic member 70 , the lower yoke 60 , the magnet 50 , the bracket 40 , the coil 30 , and the upper yoke 20 are housed in the casing 80 , and the lid 10 is covered from the Z1 side which becomes the upper side. In the present application, the case 80 or the frame portion formed by the cover 10 and the case 80 may be described as a case.

As shown in FIG. 5, the coil 30 is wound so that it may become long in the Y1-Y2 direction, and has terminals 31 and 32 through which current flows. The coil 30 is fixed in a state of being placed on the surface 40 a on the Z1 side of the bracket 40 , and on the Y1 side and the Y2 side of the bracket 40 , housings for connection to the housing 80 are formed so as to extend in the Z2 direction. Mounting part 41 . In addition, the bracket 40 is formed by punching and bending a metal plate such as non-magnetic 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 X1-X2 direction of the lower yoke 60 is the longitudinal direction, and a concave portion 61 recessed in the Z2 direction is provided. Side surfaces 61 b extending in the Z1 direction are formed at the end on the X1 side and the end on the X2 side of the bottom surface 61 a of the concave portion 61 of the lower yoke 60 , and further on the X1 direction and the X2 direction side outside of both side surfaces 61 b Connection portions 62 extending in the X1 direction and the X2 direction are formed. On the Z1 side surface of the magnet 50 , the X1 side becomes the S pole, the X2 side becomes the N pole, and on the Z2 side surface, the X1 side becomes the N pole, and the X2 side becomes the S pole.

When assembling the vibrating body of the vibration generator of the present embodiment, the magnet 50 is joined to the bottom surface 61 a of the recess 61 of the lower yoke 60 , and the connecting portion 62 of the lower yoke 60 is joined to the upper yoke 20 . . In the present embodiment, the lower yoke 60 and the upper yoke 20 surrounding the magnets 50 are separate components, and thus are easy to assemble.

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

The bracket 40 is attached by inserting the case attachment portion 41 provided in the bracket 40 into the opening of the bracket support portion 83 provided in the case 80 . Therefore, the vibrating body is formed by the upper yoke 20 , the magnet 50 , and the lower yoke 60 , but 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 vibrating body support portion 72 , and a spring portion 73 . The case connecting portion 71 is fixed by connecting the Z2 side surface to the Z1 side surface of the bottom plate portion 82 of the case 80 . In addition, the Z2 side of the vibrating body formed of the upper yoke 20 , the magnet 50 , and the lower yoke 60 is joined and fixed to the Z1 side surface of the vibrating body support portion 72 . The spring portion 73 is provided between the case connecting portion 71 and the vibrating body support portion 72 .

The elastic member 70 is 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 0.1 mm, to form a metal plate in a punched state as shown in FIG. 10 . After that, the elastic member 70 as shown in FIG. 9 can be formed by bending the metal plate in the punched state. The spring portion 73 passes through a bending line 70a parallel to the Y1-Y2 direction on both sides of the X1 side and the X2 side of the metal plate in the punched state shown in FIG. 10 (the bending line 70a is shown in FIG. 9 ) It is formed by bending substantially perpendicular to the Z1 direction. Therefore, in the elastic member 70 , the case connecting portion 71 and the vibrating body support portion 72 are flush with each other.

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

In addition, the spring portion 73 is formed substantially parallel to the YZ plane, and desired elasticity can be obtained by forming the second groove region 74b of the groove 74 formed long in the Y1-Y2 direction. The spring portion 73 is connected to the case connecting portion 71, and has a first area 73a extending from the case connecting portion 71 in the Z1 direction; a second area 73b extending from the first area 73a in the Y1 direction; A third region 73c extending in the Z2 direction from the region 73b, and a fourth region 73d connecting the third region 73c to the vibrating body support portion 72 and partially extending in the Y1-Y2 direction. The second region 73b and the fourth region 73d and the like are separated by the second groove region 74b of the groove 74 which is long in the Y1-Y2 direction, the second region 73b is formed to be long in the Y1-Y2 direction, and this part acts particularly as a spring function. Therefore, the second region 73b of the spring portion 73 is formed long in the direction parallel to the bending line 70a.

In addition, when bending a metal plate to form an elastic member such as a spring, it is difficult to bend at an angle close to 180°, which is difficult to manufacture. In addition, the strength of the bent portion is reduced, so vibration easy to break, etc. Therefore, in the present embodiment, the elastic member 70 is formed by bending at about 90° in order to facilitate manufacture and prevent a decrease in strength. Thereby, the manufacture of the vibration generating device is easy, and the reliability can be improved.

In addition, a vibrator is joined to the vibrator support portion 72 , and bent portions 75 formed by bending a part of the vibrator support portion 72 in the Z1 direction substantially vertically are provided on the X1 side and the X2 side of the vibrator body. The bent portion 75 can be used as a mark for alignment when the vibrator is joined to the vibrator support portion 72, and can also be used as a support portion for supporting the vibrator on the X1 side and the X2 side.

Next, the vibration of the vibration generating device in the present embodiment will be described. 11 shows the vibrating body formed by the upper yoke 20 , the magnet 50 , and the lower yoke 60 of the vibration generator according to the present embodiment, and the vibrating body provided inside the space surrounded by the lower yoke 60 and the upper yoke 20 the coil 30 and the bracket 40. By the magnetic field of the magnet 50, the magnetic field lines shown by the dashed arrows in FIG. 11 are generated. In addition, FIG. 12 is a front view of the vibration generator in this embodiment.

Specifically, on the X1 side of the magnet 50, from the N pole on the Z2 side, inside the lower yoke 60 and the upper yoke 20, and between the upper yoke 20 and the S pole on the X1 side of the magnet 50 After passing through the space, it enters the S pole on the X1 side of the magnet 50 . In addition, on the X2 side of the magnet 50, from the N pole on the Z1 side, the space between the N pole on the X2 side of the magnet 50 and the upper yoke 20, the interior of the upper yoke 20 and the lower yoke 60 After passing through, it enters the S pole on the X2 side of the magnet 50 . On the Z1 side of the magnet 50 , there are also magnetic lines of force entering 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 entering the S pole from the N pole on the Z2 side of the magnet 50 .

Therefore, in the area surrounded by the upper yoke 20 and the lower yoke 60 , the magnetic field lines are concentrated in the space between the upper yoke 20 and the magnet 50 , and the magnetic field becomes stronger, and the coil 30 is provided in this space. In the present embodiment, by passing an alternating current between the terminals 31 and 32 of the coil 30 , the vibrating body formed of the upper yoke 20 , the magnet 50 , and the lower yoke 60 can be vibrated in the X1 - X2 direction.

For example, when a current flows so that the terminal 31 of the coil 30 is positive and the terminal 32 is negative, the vibrating body formed by the upper yoke 20 , the magnet 50 and the lower yoke 60 moves in the X2 direction. In addition, when a current flows so that the terminal 31 of the coil 30 is negative and the terminal 32 is positive, the vibrating body formed by the upper yoke 20 , the magnet 50 and the lower yoke 60 moves in the X1 direction. Therefore, by allowing currents to alternately flow positive and negative in the terminals 31 and 32 of the coil 30 , the vibrating body formed by the upper yoke 20 , the magnet 50 , and the lower yoke 60 can be moved in the X1 - X2 direction. vibration. In addition, since the bracket 40 to which the coil 30 is attached is connected to the casing 80 and separated from the vibrating body, the coil 30 and the bracket 40 do not vibrate.

However, the heavier the vibrating body, the stronger the vibration can be obtained. Therefore, by increasing the length in the X1-X2 direction of the connecting portion 62 of the lower yoke 60 and the connecting portion 21 of the upper yoke 20 to which the connecting portion 62 of the lower yoke 60 is connected, the vibrating body is made longer. Heavy. In the present application, the connecting portion 62 of the lower yoke 60 and the connecting portion 21 of the upper yoke 20 to which the connecting portion 62 is connected may be collectively described as the extending region 63 . In the present embodiment, the length L in the X1-X2 direction in the extension region 63 is about 1.3 mm, and the vibrating body becomes heavier by an amount corresponding to the extension regions 63 provided on both sides. In addition, the thickness of the upper yoke 20 is 0.3 mm, 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 this embodiment, the weight of the vibrating body formed of the upper yoke 20 , the magnet 50 , and the lower yoke 60 is 1.03 g. In addition, when the vibrating body was vibrated at 99 Hz, which is the natural frequency, a stroke length of ±1.2 mm and an overall stroke length of 2.4 mm were obtained in the X1-X2 direction, and strong vibration was obtained. FIG. 13 shows a state in which the position of the vibrating body is displaced by vibrating the vibration generating device in the present embodiment. 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 becomes a main elastic region and functions as a spring.

The extending region 63 formed by the upper yoke 20 and the lower yoke 60 is preferably provided at a position outside the concave portion 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 case 80 in the Y1-Y2 direction orthogonal to the vibration direction. Therefore, an extended setting area of sufficient quality cannot be set. In addition, in the Z1-Z2 direction, the height of the vibration generating device becomes high, and the requirement for miniaturization cannot be satisfied. Therefore, the extended area 63 is provided in the X1-X2 direction as the vibration direction.

The effect obtained by the vibration generator of this embodiment is demonstrated based on the figure which simplified the structure. FIG. 14 is a diagram schematically showing the configuration of the vibration generating device in the present embodiment in a simplified manner. As shown in FIG. 14 , an elastic member 70 is provided between the vibrating body formed by the upper yoke 20 , the magnet 50 and the lower yoke 60 and the casing 80 , and is attached between the magnet 50 and the upper yoke 20 There are coils 30 . The extended region 63 is formed by the connection portion of the upper yoke 20 and the lower yoke 60 .

FIG. 15 is a vibration generating device having a configuration in which an extension region is not provided. In this vibration generating device, the vibrating body is formed of the magnet 50 , the upper yoke 920 , and the lower yoke 960 , and the extending 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 smaller than the vibration generating device shown in FIG. The vibrating body formed by 920 and the lower yoke 960 is heavier. Therefore, the vibration generating device of the present embodiment can obtain stronger vibration than the vibration generating device shown in FIG. 15 .

(Variation)

Next, a modification of the present embodiment will be described based on FIG. 16 . This modification is a structure in which the extending region 162 of the lower yoke 160 is provided on the concave portion 161 side of the lower yoke 160 . Also in this case, the extending region 162 can be extended in the X1-X2 direction, which is the vibration direction. However, since the coil 30 and the like exist inside the recessed portion 161 of the lower yoke 160 , there is a limit to extending the length of the extending region 162 . Therefore, the configuration shown in FIGS. 14 and 1 to 13 is more preferable.

As mentioned above, although embodiment was described in detail, it is not limited to specific embodiment, Various deformation|transformation and change are possible within the range described in the claim.

Description of reference numerals

10 cover

20 Upper yoke

21 Connector

30 coils

31, 32 terminals

40 bays

41 Housing mounting part

50 Magnets

60 Lower yoke

61 Recess

61a Bottom

61b side

62 Connector

63 Extended settings area

70 Elastic parts

70a Bend line

71 Housing connection

72 Vibrating body support

73 Spring part

73a First area

73b Second area

73c Third area

73d Fourth area

74 slots

74a First slot area

74b Second slot area

75 Bending part

80 shell

81 Opening

82 Bottom plate

83 Bracket support

Claims (4)

1. A vibration generating device comprising: shell; a vibrating body formed by a magnet, an upper yoke provided on the upper side of the magnet, and a lower yoke provided on the lower side of the magnet; and a coil arranged between the upper yoke and the magnet and fixed to the housing, In the vibration generating device, the vibrating body vibrates by causing an alternating current to flow through the coil, The vibration generating device is characterized in that, The upper yoke or the lower yoke is provided with a concave portion, and the magnet is attached to the bottom surface of the concave portion, The lower yoke and the upper yoke are joined in an extended region formed long in the vibration direction of the vibrating body. 2. The vibration generating device according to claim 1, characterized in that, The extending region extends to the outside of the recess. 3. The vibration generating device according to claim 1, wherein A bracket supporting the coil is provided, and the bracket is connected to the housing in a direction orthogonal to the vibration direction. 4. The vibration generating device according to claim 1, wherein The casing and the vibrating body are connected by an elastic member formed of metal.

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