Flat linear vibration motor

Patent metadata

Field	Value
Publication number	US-9935535-B2
Application number	US-201514984381-A
Country	US
Kind code	B2
Filing date	Dec 30, 2015
Priority date	Feb 2, 2015
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

A flat linear vibration motor is disclosed. The flat linear vibration motor includes a housing having an accommodation space; a first magnet received in the accommodation space and fixed in the housing; and a vibrator unit suspended in the housing. The vibrator unit includes a clump weight, a third magnet, a driving magnet, and a fourth magnet; a second magnet fixed in the housing, the first magnet, the vibrator unit and the second magnet arranged one by one along a vibration direction of the vibrator unit; engaging assemblies suspending the vibrator unit inside the housing and driving the vibrator unit to move along the vibration direction; wherein the flat linear vibration motor further includes a ring driving coil received in the accommodation space, the ring driving coil being spaced from and surrounding the driving magnet.

First claim

What is claimed is:

1. A flat linear vibration motor, including:
a housing having an accommodation space;
a first magnet received in the accommodation space and fixed in the housing;
a vibrator unit suspended in the housing, the vibrator unit including a clump weight, a third magnet, a driving magnet, and a fourth magnet, the third magnet being such configured that a magnetic pole thereof is opposite to an adjacent magnetic pole of the first magnet;
a second magnet fixed in the housing, the first magnet, the vibrator unit and the second magnet arranged one by one along a vibration direction of the vibrator unit; the second magnet being such configured that a magnetic pole thereof is opposite to an adjacent magnetic pole of the fourth magnet;
engaging assemblies suspending the vibrator unit inside the housing and driving the vibrator unit to move along the vibration direction, the engaging assemblies including guide groove parts having magnetic guide grooves, and guide rail parts having magnetic guide rails which are at least partially wrapped by the magnetic guide grooves, same magnetic poles of the magnetic guide rails and the magnetic guide grooves being configured to face to face for suspending the magnetic guide rails in the magnetic guide grooves; and
a driving coil received in the accommodation space, the driving coil being spaced from and surrounding the driving magnet.

2. The flat linear vibration motor as described in claim 1 , wherein the housing includes an upper shell and a lower shell cooperating with the upper shell for forming the accommodation space, the lower shell includes a bottom wall and a side wall extending from the bottom wall, the first magnet and the second magnet are fixed respectively on the side wall of the lower shell.

3. The flat linear vibration motor as described in claim 1 , wherein the clump weight includes a first outer side face and a second outer side face opposed to the first outer side face, the housing includes a first inner side wall and a second inner side wall, the engaging assemblies includes a first engaging assembly located between the first outer side face and the first inner side face, and a second engaging assembly located between the second outer side face and the second inner side face.

4. The flat linear vibration motor as described in claim 3 , wherein the first outer side face and the second outer side face extend along the vibration direction of the vibrator unit, the first inner side wall and the second inner side wall extend along the vibration direction of the vibrator unit.

5. The flat linear vibration motor as described in claim 3 , wherein:
the first engaging assembly includes a first guide rail part fixed on the first outer side face and forming a first magnetic guide rail, and a first guide groove part fixed on the first inner side surface and forming a first magnetic guide groove, the first guide rail part being cooperating with the first guide groove part;
the second engaging assembly includes a second guide rail part fixed on the second outer side face and forming a second magnetic guide rail, and a second guide groove part fixed on the second inner side surface and forming a second magnetic guide groove, the first guide rail part being cooperating with the first guide groove part; and
by virtue of the cooperation between the guide rails and the guide grooves, the vibrator unit is suspended in the housing and moveable along the vibration direction.

6. The flat linear vibration motor as described in claim 1 , wherein the guide rail part includes a first guide rail magnet attached to an upper surface of the clump weight, a second guide rail magnet attached to a lower surface of the clump weight, and a third guide rail magnet attached to a side surface of the clump weight, correspondingly, the guide groove part includes a first groove magnet located above the first guide rail magnet and having a magnetic pole facing a same magnetic pole of the first guide rail magnet, a second guide groove magnet located below the second guide rail magnet and having a magnetic pole facing a same magnetic pole of the second guide rail magnet, and a third guide groove magnet located on the housing and having a magnetic pole thereof facing a same magnetic pole of the third guide rail magnet.

7. The flat linear vibration motor as described in claim 1 , wherein slots are provided at two opposed ends of the clump weight for respectively receiving the third and fourth magnets.

8. The flat linear vibration motor as described in claim 1 , wherein the driving magnet includes, arranged along the vibration direction, a fifth magnet, a sixth magnet and a seventh magnet, correspondingly, the clump weight further includes a first through hole, a second through hole, and a third through hole for respectively receiving the fifth magnet, the sixth magnet and the seventh magnet.

9. The flat linear vibration motor as described in claim 8 , wherein a magnetization direction of the fifth magnet is same to a magnetization direction of the seventh magnet, while a magnetization direction of the sixth magnet is reverse to a magnetization direction of the seventh magnet; the driving coil includes a first driving coil located above the fifth and sixth magnets, and a second driving coil located above the sixth and seventh magnets.

Assignees

• Guo Shun
• Wang Hongxing
• Mao Lubin
• Aac Technologies Pte Ltd

Inventors

• Guo Shun
• Wang Hongxing
• Mao Lubin

Classifications

• H02K33/16 Primary

  with polarised armatures moving in alternate directions by reversal or energisation of a single coil system · CPC title