CN211830531U - Linear vibration motor and electronic apparatus - Google Patents
Linear vibration motor and electronic apparatus Download PDFInfo
- Publication number
- CN211830531U CN211830531U CN201890001155.9U CN201890001155U CN211830531U CN 211830531 U CN211830531 U CN 211830531U CN 201890001155 U CN201890001155 U CN 201890001155U CN 211830531 U CN211830531 U CN 211830531U
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- Prior art keywords
- movable element
- vibration
- end side
- magnet
- vibration motor
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- 239000000696 magnetic material Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 238000013016 damping Methods 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 5
- 239000007769 metal material Substances 0.000 description 5
- 230000004044 response Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/04—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with electromagnetism
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K33/16—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
The damping performance of vibration is improved. The method comprises the following steps: a vibrating movable element (10); a leaf spring (40) that flexes on one side of the movable element (10) in the direction of vibration; a support part (22d) for supporting the plate spring (10) on one side in the vibration direction; and a coil (30) that vibrates the movable element (10), the movable element (10) having a magnet (11) on an end portion side in the vibration direction, a leaf spring (40) having one end side connected to the movable element (10) and the other end side connected to the support portion (22d), the leaf spring having a flexure piece portion (41) between the one end side and the other end side, the flexure piece portion being flexed accompanying the vibration of the movable element (10) so as to approach or separate from the magnet (11), at least the flexure piece portion (41) being formed of a magnetic material.
Description
Technical Field
The present invention relates to a linear vibration motor and an electronic apparatus including the same.
Background
A vibration motor (or a vibration actuator) is widely used as a device that is built in a mobile electronic device and transmits signals such as reception of signals and generation of signals such as warnings to a carrier by vibration, and is an indispensable device in a wearable electronic device that is carried by a carrier. In addition, a vibration motor has recently attracted attention as a device for realizing a tactile technique (skin feel feedback) in a human-machine interface such as a touch panel.
Various forms of such vibration motors have been developed, and among them, a linear vibration motor capable of generating relatively large vibration by linear reciprocating vibration of a movable element has been attracting attention. The linear vibration motor is provided with a weight and a magnet on the movable element side, and causes the movable element elastically supported in the vibration direction to vibrate in one axial direction by a lorentz force acting on the magnet as a driving force by energizing a coil provided on the fixed element side.
For example, patent document 1 describes a vibration actuator in which a movable element is fastened to a side wall of a lid portion via a leaf spring so that the leaf spring is elastically deflected in accordance with vibration of the movable element (weight).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2017-18958
Disclosure of Invention
Technical problem to be solved by the invention
However, according to the above-described conventional technique, even when the coil is switched from the energized state to the non-energized state, the movable element continues to vibrate freely by inertia, and therefore, a certain amount of time is required until the vibration is completely stopped. Therefore, for example, in a situation where the electronic device repeatedly vibrates and stops in response to repeated quick touch operations, the responsiveness may be perceived to be slow.
Technical scheme for solving technical problem
In order to solve the above technical problem, the present invention includes the following configurations.
A linear vibration motor, comprising: a vibrating movable member; a leaf spring that flexes on one side in a vibration direction of the movable element; a support portion that supports the plate spring on the vibration direction side; and a coil for vibrating the movable element, wherein the movable element has a magnet at an end portion side in a vibration direction, one end side of the plate spring is connected to the movable element and the other end side is connected to the support portion, the plate spring has a flexure piece portion between the one end side and the other end side, the flexure piece portion is flexed along with vibration of the movable element so as to approach or separate from the magnet, and at least the flexure piece portion is formed of a magnetic material.
Drawings
Fig. 1 is a perspective view showing an example of a linear vibration motor according to the present invention.
Fig. 2 is an exploded perspective view showing the linear vibration motor.
Fig. 3 is a longitudinal sectional view of the linear vibration motor.
Fig. 4 is a diagram of the linear vibration motor, in which the substrate portion, the coil, and the like are omitted, and shows a state in which the movable element is positioned at a substantially center in the vibration direction.
Fig. 5 is a diagram of the linear vibration motor, in which the substrate portion, the coil, and the like are omitted, and shows a state in which the mover is located at one side in the vibration direction.
Fig. 6 is a perspective view showing an example of an electronic device including the linear vibration motor.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals in different drawings denote parts having the same functions, and overlapping description in each drawing is appropriately omitted.
As shown in fig. 1 to 4, the linear vibration motor 1 includes: a vibrating movable member 10; a box-shaped base 20 that supports the movable element 10 so as to be capable of vibrating; a coil 30 that vibrates the movable element 10 along the base 20; and two leaf springs 40, 40 elastically deflecting in a space on one side of the movable element 10 in the vibration direction.
The movable element 10 is formed in a long shape in which the dimension in the cross direction intersecting the vibration direction is longer than the dimension in the vibration direction.
The movable element 10 includes: a pair of magnets 11, 11 located on both end sides in the vibration direction; weights 12 and 12 fixed to both ends of the magnets 11 and 11 in the intersecting direction; and a yoke portion 13 fixed to the surfaces of the magnets 11 and 11 opposite to the coils in the longitudinal direction, and the movable element 10 is supported to vibrate in the short-side direction (Y direction in the figure) via leaf springs 40 and 40 on both sides.
Each magnet 11 is formed in a long rectangular parallelepiped shape extending in a cross direction intersecting the vibration direction, and one of the directions (Z direction in the drawing) orthogonal to the surface of the coil 30 is an N pole, and the other is an S pole.
The pair of magnets 11, 11 are provided substantially in parallel with a predetermined gap therebetween. The magnetic pole of one magnet 11 is opposite to the magnetic pole of the other magnet 11.
The pair of magnets 11, 11 are integrally fixed by a yoke 13.
The weight members 12, 12 are formed in a substantially rectangular parallelepiped shape from a metal material having a high specific gravity (for example, tungsten).
When the movable element 10 vibrates in the short-side direction (Y direction in the figure), each weight 12 abuts against a cushion member 14 fixed to the inner surface of the cover portion 22 of the base 20, which will be described later.
The cushion member 14 is formed in a block shape from an elastic material such as rubber, and the cushion member 14 receives the movable element 10 at the time of vibration and transmits the impact thereof to the cover portion 22, and prevents the generation of vibration sound by elastic deformation.
The yoke portion 13 is formed in an elongated shape covering the surfaces of the pair of magnets 11, 11 on the opposite side to the coil, and has protruding pieces 13a, 13a protruding toward the coil 30 on both ends in the longitudinal direction of the yoke portion 13. Each protruding piece portion 13a is provided with a convex portion 13a1, and the convex portion 13a1 is used for positioning and supporting the leaf spring 40.
The yoke portion 13 is formed to have a substantially concave cross section by, for example, bending a substantially rectangular plate material made of a magnetic metal material.
Each protruding piece portion 13a has a fitting piece portion 13a2 bent in the vicinity of the center in the width direction (Y direction in the figure), and the fitting piece portion 13a2 is sandwiched between the pair of magnets 11, 11 and bonded to the magnets 11, 11 via an adhesive.
The base body 20 includes a substrate portion 21 and a cover portion 22, and is configured in a long box shape along the coil 30 and the movable element 10, wherein the substrate portion 21 supports and fixes the coil 30, and the cover portion 22 covers the periphery of the movable element 10 and the surface opposite to the coil.
The base plate 21 is formed in a substantially rectangular shape, and a terminal plate 21a projects from a long side portion thereof. Two terminals T, T are provided on the surface of the terminal plate 21a, and the terminals T, T are electrically connected to both ends of the wire material constituting the coil 30.
Two side walls 22b, 22b of the four side walls, which face each other on both sides in the vibration direction (Y direction in the drawing) of the movable element 10, have two notches 22b1, 22b1, respectively, the two notches 22b1, 22b1 are spaced apart in the orthogonal direction (X direction in the drawing) orthogonal to the vibration direction, and a support portion 22d for supporting the leaf spring 40 is provided between the two notches 22b1, 22b 1.
The support portion 22d is positioned between the two notch-shaped cutout portions 22b1 and protrudes from the flat plate portion 22a side toward the substrate portion 21 side, and a gap s1 is secured between the protruding end portion of the support portion 22d and the surface of the substrate portion 21 and the surface of the terminal plate 21a facing each other.
Therefore, for example, when the linear vibration motor 1 receives a relatively strong impact such as a drop impact, the support portion 22d swings in the X direction with the flat plate portion 22a side as a fulcrum and the gap s1 side is slightly elastically deformed by the force component in the X direction of the impact.
The support portion 22d is elastically deformed by a smaller amount than the deflection amount of the plate spring 40. That is, the rigidity of the support portion 22d in the intersecting direction (X direction in the figure) is set to be greater than the rigidity of the leaf spring 40 in the flexing direction (Y direction in the figure).
The coil 30 is an air-core coil having no core material, and the coil 30 is wound in a long flat shape and fastened to the substrate portion 21 with a substantially constant gap with respect to the surfaces of the pair of magnets 11 and 11 on the opposite side to the yoke portion 13.
The coil 30 is supplied with a drive signal composed of, for example, an alternating current or a pulse current via a terminal T, T, and the drive signal has a resonance frequency (natural frequency) determined by the mass of the movable element 10 and the elastic coefficient of the leaf spring 40.
Two leaf springs 40 are disposed point-symmetrically in a space located on both sides of the movable element 10 in the vibration direction (see fig. 4).
One end side of each leaf spring 40 is connected to the movable element 10 and the other end side thereof is connected to the support portion 22d, and the leaf spring has a flexure strip portion 41 between the one end side and the other end side, and the flexure strip portion 41 is made of a magnetic material that can be attracted to the magnet 11 by flexing to approach or separate from the magnet 11 in accordance with the vibration of the movable element 10.
Specifically, the plate spring 40 is formed by bending an elastically flexible long plate material made of magnetic metal into a substantially L-shape, and the plate spring 40 includes: a flexure piece portion 41 provided to extend obliquely along the end surfaces in the short side direction (the illustrated Y direction) of the pair of magnets 11, 11; a fastening piece 42, the fastening piece 42 being fastened to the movable element 10 at one end side of the flexure piece 41; and a fastening piece portion 43, the fastening piece portion 43 being fastened to the support portion 22d on the other end side of the flexure piece portion 41.
The flexure piece portion 41 is adjacent to the magnet 11 in the vibration direction, and is formed in an inclined piece shape gradually separated from the magnet 11 from one end side toward the other end side. The flexure piece portion 41 is located at a position magnetically attracted by the magnet 11 when approaching the magnet 11.
A narrowed portion 41a is provided near the center of the flexure piece portion 41 in the longitudinal direction, and the narrowed portion 41a gradually reduces the dimension of the movable element 10 in the thickness direction. The narrowed portion 41 disperses stress applied to bent portions, connecting portions, and the like on both end sides, but may be omitted.
Further, according to the illustrated example, only the flexure piece portion 41 is provided in the space where the flexure piece portion 41 is flexed and deformed. In other words, no member other than the flexure strip portion 41 exists between the magnet 11 and the side wall 22b of the cover portion 22 over the entire length of the flexure strip portion 41 in the X direction. Therefore, the flexure piece portion 41 can be deformed in flexure without interfering with other members. As another example other than the illustrated example, a configuration may be adopted in which a member (e.g., a cushion member, another member, or the like) other than the flexure strip portion 41 is provided in the space.
One fastening piece 42 is provided in a plate shape extending in a direction orthogonal to the vibration direction of the movable element 10. The fastening piece 42 is fixed between the outer surface of the protruding piece 13a and the weight 12 by sandwiching the protruding piece 13a between the protruding piece 42a and the convex portion 13a1 on the yoke 13 side by fitting the through-shaped fitting hole 42 a. The fixing method may be welding, bonding, or the like.
The other fastening piece portion 43 is formed in a plate shape substantially parallel to the side wall 22b of the cover portion 22, and is welded to the support portion 22d of the side wall 22 b.
A cushion member 44 is fixed to the back side (the side opposite to the support portion 22d) of the fastening piece portion 43, and the cushion member 44 is made of an elastic material such as rubber. The damper 44 prevents the plate spring 40 from contacting the side surface of the magnet 11 and generating noise when the movable element 10 vibrates.
Next, the characteristic operation and effects of the linear vibration motor 1 configured as described above will be described in detail.
When ac power is supplied to the coil 30, the movable element 10 reciprocates in the short-side direction by the magnetic action between the coil 30 and the pair of magnets 11 and 11, the leaf springs 40 and 40 on both sides elastically deflect in accordance with the reciprocation, and vibrations generated by the reciprocation are transmitted to the base 20 via the support portion 22d and the like.
In the reciprocating movement, as shown in fig. 5, when the gap s2 between the side surface of one magnet 11 and the flexure strip portion 41 becomes narrow, the magnet 11 and the flexure strip portion 41 attract each other by the magnetic force.
Therefore, when the movable element 10 is stopped from the vibration state by interrupting the power supply to the coil 30, the vibration of the movable element 10 can be rapidly attenuated by the magnetic attraction between the magnet 11 and the flexure piece portion 41. That is, the damping performance when the movable element 10 is stationary is good.
Next, an electronic apparatus including the linear vibration motor 1 will be described.
Fig. 6 illustrates a mobile information terminal 100 as an electronic device including the linear vibration motor 1 of the embodiment of the present invention.
The portable information terminal 100 is configured to vibrate the linear vibration motor 1 in response to a touch operation on the touch operation panel 50 (including a touch display panel), and the vibration damping performance is excellent. Therefore, for example, even in the case where the mobile information terminal 100 is repeatedly vibrated and stopped in response to a quick touch operation that is repeatedly performed, good responsiveness can be obtained.
As another example, the linear vibration motor 1 may be mounted on an electronic device that does not include the touch panel 50.
Further, according to the above embodiment, the plate spring 40 and the support portion 22d are provided on both sides in the vibration direction, but as another example, the plate spring 40 and the support portion 22d may be provided on only one side in the vibration direction. In this case, the other side opposite to the one side may be configured to support the movable element 10 by a structure other than the one shown in the figure, or may be configured not to support the movable element 10.
Further, in the above-described embodiment, the entire plate spring 40 including the flexure piece portions 41 is formed of the magnetic metal material, but as another example of the plate spring 40, only the flexure piece portions 41 may be formed of the magnetic metal material, and the other portions (the fastening piece portions 42, 43, and the like) may be formed of a material other than the magnetic metal material.
Further, according to the above embodiment, the movable element 10 is vibrated in the short-side direction, but as another example, the movable element may be vibrated in the long-side direction.
While the embodiments of the present invention have been described in detail, the specific configurations are not limited to the above embodiments, and design changes and the like that are made within a range that does not depart from the gist of the present invention are also included in the present invention. In addition, the above embodiments can be combined by following the respective techniques as long as there is no particular contradiction or problem in the purpose, structure, and the like.
(symbol description)
1: linear vibration motor
10: movable part
11: magnet body
20: base body
21: substrate part
22: cover part
22 d: support part
30: coil
40: flexural leaf spring
41: flexure piece portion
42. 43: fastening piece part
100: mobile information terminals (electronic devices).
Claims (5)
1. A linear vibration motor, comprising: a vibrating movable member; a leaf spring that flexes on one side in a vibration direction of the movable element; a support portion that supports the plate spring on the vibration direction side; and a coil for vibrating the movable member,
the movable element has a magnet at an end portion side in a vibration direction,
the leaf spring has one end side connected to the movable element and the other end side connected to the support portion, and has a flexure piece portion between the one end side and the other end side, the flexure piece portion being flexed accompanying vibration of the movable element so as to approach or separate from the magnet, at least the flexure piece portion being formed of a magnetic material.
2. The linear vibration motor of claim 1,
the flexure piece portion is formed in an inclined piece shape gradually separated from the magnet from the one end side toward the other end side.
3. The linear vibration motor according to claim 1 or 2,
the magnet, the plate spring, and the support portion are respectively disposed at both sides of the vibration direction.
4. The linear vibration motor according to any one of claims 1 to 3,
only the flexure piece portion is provided in the space in which the flexure piece portion is flexed and deformed.
5. An electronic device, characterized in that,
comprising the linear vibration motor of any one of claims 1 to 4.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017163988A JP6971714B2 (en) | 2017-08-29 | 2017-08-29 | Linear vibration motors and electronic devices |
| JP2017-163988 | 2017-08-29 | ||
| PCT/JP2018/023427 WO2019044127A1 (en) | 2017-08-29 | 2018-06-20 | Linear vibration motor and electronic apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211830531U true CN211830531U (en) | 2020-10-30 |
Family
ID=65525217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201890001155.9U Expired - Fee Related CN211830531U (en) | 2017-08-29 | 2018-06-20 | Linear vibration motor and electronic apparatus |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6971714B2 (en) |
| CN (1) | CN211830531U (en) |
| WO (1) | WO2019044127A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601489A (en) * | 2019-09-11 | 2019-12-20 | 浙江省东阳市东磁诚基电子有限公司 | Novel elastic sheet type linear motor and implementation method thereof |
| CN111641322B (en) * | 2020-06-30 | 2022-03-25 | 歌尔股份有限公司 | Vibration device and electronic apparatus |
| CN217388499U (en) | 2021-05-06 | 2022-09-06 | 瑞声光电科技(常州)有限公司 | Linear vibration motor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS592562A (en) * | 1982-06-28 | 1984-01-09 | Nippon Kogaku Kk <Nikon> | Movable coil type actuator |
| JP4623002B2 (en) * | 2006-12-28 | 2011-02-02 | パナソニック電工株式会社 | Vibration type linear actuator |
| JP6702820B2 (en) * | 2015-10-16 | 2020-06-03 | 日本電産コパル株式会社 | Vibration motor |
| JP6341974B2 (en) * | 2016-11-02 | 2018-06-13 | 日本電産コパル株式会社 | Vibration actuator |
-
2017
- 2017-08-29 JP JP2017163988A patent/JP6971714B2/en active Active
-
2018
- 2018-06-20 WO PCT/JP2018/023427 patent/WO2019044127A1/en active Application Filing
- 2018-06-20 CN CN201890001155.9U patent/CN211830531U/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019044127A1 (en) | 2019-03-07 |
| JP2019041548A (en) | 2019-03-14 |
| JP6971714B2 (en) | 2021-11-24 |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201030 Termination date: 20210620 |
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| CF01 | Termination of patent right due to non-payment of annual fee |