Vibration motor and electronic device

Patent metadata

Field	Value
Publication number	US-2025167656-A1
Application number	US-202318841549-A
Country	US
Kind code	A1
Filing date	Apr 28, 2023
Priority date	Aug 26, 2022
Publication date	May 22, 2025
Grant date	—

Abstract

A vibration motor and an electronic device are provided. The vibration motor may be applied to electronic devices such as a mobile phone and a PAD. A partial region of a first side wall of a housing of the vibration motor protrudes outward to form a concave cavity with an opening facing a movable component. A driving coil is partially or completely located in the concave cavity. In a case that a same electromagnetic force is achieved, the vibration motor in this application may reduce a height of the driving coil protruding from the opening of the concave cavity as much as possible.

First claim

1 . A vibration motor, comprising a housing, wherein a driving coil and a movable component are disposed in an inner cavity of the housing, and the driving coil is configured to drive the movable component to reciprocate relative to the housing to generate vibration: a first side wall of the housing has a protruding portion protruding toward a side facing away from the movable component, the protruding portion forms a concave cavity with an opening facing the movable component, and the driving coil is at least partially located in the concave cavity.

2 . The vibration motor according to claim 1 , wherein elastic components are disposed between two opposite side walls of the movable component and inner walls of the housing on corresponding sides.

3 . The vibration motor according to claim 2 , further comprising a circuit board, wherein the circuit board comprises a first part located in the inner cavity and a second part located outside the inner cavity, a first connection end and a second connection end are disposed on the second part, the driving coil is opposite to the first part, and both ends of the driving coil are electrically connected to the first connection end and the second connection end respectively through corresponding wires on the circuit board.

4 . The vibration motor according to claim 3 , wherein the driving coil comprises a cylindrical coil and a planar coil, the planar coil is disposed on the first part and wound round by round in a plane of the circuit board along a predetermined direction, and the planar coil and the cylindrical coil are connected in series and have a same current rotation direction.

5 . The vibration motor according to claim 4 , wherein the planar coil comprises a first planar coil and a second planar coil connected in series and having a same current rotation direction, the first planar coil is located on a first side surface of the circuit board facing the movable component, and the second planar coil is located on a second side surface of the circuit board facing away from the movable component.

6 . The vibration motor according to claim 5 , wherein the cylindrical coil comprises a first cylindrical coil and a second cylindrical coil, the first cylindrical coil is located on the first side surface, and the second cylindrical coil is located on the second side surface; and the first cylindrical coil, the first planar coil, the second planar coil, and the second cylindrical coil are electrically connected end to end in sequence, and a free end of the first cylindrical coil and a free end of the second cylindrical coil are electrically connected to the first connection end and the second connection end respectively.

7 . The vibration motor according to claim 6 , wherein the first cylindrical coil, the first planar coil, the second planar coil, and the second cylindrical coil are coaxially arranged.

8 . The vibration motor according to claim 6 , wherein at least part of an edge region of a second side surface of the first part is supported at the opening of the concave cavity, and the second cylindrical coil is completely located inside the concave cavity.

9 . The vibration motor according to claim 6 , wherein the first cylindrical coil and the second cylindrical coil are fixed to the circuit board through an adhesion process.

10 . The vibration motor according to claim 6 , wherein a magnetic core component is further disposed in an inner hole of at least one of the first cylindrical coil or the second cylindrical coil.

11 . The vibration motor according to claim 10 , wherein a distance between the magnetic core component and the movable component is greater than a distance between the first cylindrical coil and the movable component.

12 . The vibration motor according to claim 10 , wherein the circuit board has a through hole, the through hole runs through inner ring regions of the first planar coil and the second planar coil, and the magnetic core component runs through the through hole.

13 . The vibration motor according to claim 12 , wherein the magnetic core component comprises a first magnetic core portion, a second magnetic core portion, and a third magnetic core portion, the first magnetic core portion is located in the inner hole of the first cylindrical coil and matches the inner hole of the first cylindrical coil, the second magnetic core portion is located in the inner hole of the second cylindrical coil and matches the inner hole of the second cylindrical coil, and the third magnetic core portion matches the through hole.

14 . The vibration motor according to claim 13 , wherein the first magnetic core portion, the second magnetic core portion, and the third magnetic core portion are an integrated structure or separate structures.

15 . The vibration motor according to claim 6 , wherein the movable component has a groove at a position opposite to the second cylindrical coil, and the second cylindrical coil partially extends into the groove.

16 . The vibration motor according to claim 3 , wherein the first side wall has an extension portion, the extension portion is located outside the inner cavity, and the second part is supported on the extension portion.

17 . The vibration motor according to claim 1 , wherein the movable component comprises a mass block and at least one magnetic steel installed on the mass block, and the elastic component is installed between the mass block and the housing.

18 . The vibration motor according to claim 3 , wherein the circuit board is a flexible printed circuit board.

19 . An electronic device, comprising a vibration motor, wherein the vibration motor is fixed to the electronic device through a bracket, and along a direction in which the protruding portion protrudes, an outer wall of the protruding portion does not exceed an outer wall of the bracket, wherein the vibration motor, comprising a housing, wherein a driving coil and a movable component are disposed in an inner cavity of the housing, and the driving coil is configured to drive the movable component to reciprocate relative to the housing to generate vibration: a first side wall of the housing has a protruding portion protruding toward a side facing away from the movable component, the protruding portion forms a concave cavity with an opening facing the movable component, and the driving coil is at least partially located in the concave cavity.

20 . The electronic device according to claim 19 , wherein the first side wall comprises a support wall and the protruding portion fixedly connected to each other, the support wall is attached and fixed to the bracket, the bracket has an avoidance space, and the protruding portion is located in the avoidance space.

21 - 24 . (canceled)

Assignees

• Honor Device Co Ltd

Inventors

• Zhu Jianwei
• Huang Song

Classifications

• H02K2203/03

  Machines characterised by the wiring boards, i.e. printed circuit boards or similar structures for connecting the winding terminations · CPC title

• H02K3/26

  consisting of printed conductors · CPC title

• G08B6/00

  Tactile signalling systems, e.g. tactile personal calling systems · CPC title

• B06B1/045

  using vibrating magnet, armature or coil system · CPC title

• H04M1/026

  Details of the structure or mounting of specific components · CPC title