US-20260128654-A1 - Linear Vibration Motor

US20260128654A1US 20260128654 A1US20260128654 A1US 20260128654A1US-20260128654-A1

Abstract

A linear vibration motor includes a shell, a vibration unit, a driving unit driving the vibration unit to vibrate, an insulating layer attached to the shell, and a flexible printed circuit board electrically connected with the driving unit. The vibration unit includes a magnet component. The driving unit is spaced apart from and directly opposite to the vibration unit, the driving unit includes a coil both fixed with the shell and the flexible printed circuit board by glue, the coil is electrically connected to the flexible printed circuit via a coil wire extending from the coil, the insulating layer is sandwiched between the coil wire and the shell. Compared with the related art, the linear vibration motor disclosed by the present disclosure could solve the phenomenon of poor insulation between the coil and the shell caused by the coil wire coming into direct contact with the shell.

Inventors

Weibo Chen
Xiaorong Zhou
Ziyang Zhang
Keyang Wang

Assignees

AAC MICROTECH (CHANGZHOU) CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20250409

Claims (10)

1 . A linear vibration motor comprising: a shell with an accommodating cavity; a vibration unit elastically supported in the accommodating cavity, comprising a magnet component; a driving unit fixed in the shell and driving the vibration unit to vibrate; an insulating layer attached to the shell; and a flexible printed circuit board fixed in the accommodating cavity and electrically connected with the driving unit; wherein the driving unit is spaced apart from and directly opposite to the vibration unit, the driving unit comprises a coil both fixed with the shell and the flexible printed circuit board by glue, the coil is electrically connected to the flexible printed circuit via a coil wire extending from the coil, the insulating layer is sandwiched between the coil wire and the shell.
2 . The linear vibration motor as described in claim 1 , wherein the coil is in an annular shape, the flexible printed circuit board comprises a main portion spaced apart from the coil and extending to outside of the shell, an annular portion fixed between the coil and the shell, and a connection portion connected with the main portion and the annular portion, the coil is attached to the annular portion, at least part of the coil is connected with the shell by glue.
3 . The linear vibration motor as described in claim 2 , wherein the flexible printed circuit board is provided with a through hole running therethrough, the through hole runs through the connection portion and/or the annular portion.
4 . The linear vibration motor as described in claim 1 , wherein the insulating layer is polyimide or a double-side adhesive.
5 . The linear vibration motor as described in claim 1 , wherein the vibration unit further comprises a mass block elastically supported in the shell, the magnet component comprises a first magnet group and a second magnet group, the first magnet group is fixed to a side of the mass block close to the coil, the second magnet group is fixed to a side of the mass block far away from the coil.
6 . The linear vibration motor as described in claim 5 , wherein the first magnet group comprises three first magnets fixed with the side of the mass block close to the coil, the three first magnets are spaced apart in sequence along a vibration direction of the vibration unit, the second magnet group comprises three second magnets fixed with the side of the mass block far away from the coil, the three second magnets are spaced apart in sequence along the vibration direction of the vibration unit, the three first magnets are arranged directly opposite to the three second magnets.
7 . The linear vibration motor as described in claim 6 , wherein a first groove is inwardly recessed from the side of the mass block close to the coil, a second groove is inwardly recessed from the side of the mass block far away from the coil, the first magnet group is fixed in the first groove, the second magnet group is fixed in the second groove.
8 . The linear motor as described in claim 7 , wherein a first protruding portion is protruded and extended from a central region of the first groove, a middle magnet of the three first magnets is fixed to the first protruding portion, a second protruding portion is protruded and extended from a central region of the second groove, a middle magnet of the three second magnets is fixed to the second protruding portion.
9 . The linear motor as described in claim 8 , wherein the driving unit further comprises an iron core fixed in the shell, the coil is wound around the iron core and spaced apart from the shell.
10 . The linear motor as described in claim 1 , wherein the shell is in a rectangular shape, the linear vibration motor further comprises two elastic members, two opposite sides of the vibration unit are supported on two opposite sides of the shell by the two elastic members.

Description

TECHNICAL FIELD This invention relates to field of motors, specifically involving a linear vibration motor. BACKGROUND A linear vibration motor is a machine that converts other forms of energy into mechanical motion, and are mainly used in a device which requires mechanical motion, such as a cell phone, a game console, and a flat panel with vibration capability. The linear vibration motor mainly includes a shell, a vibration unit elastically supported in the shell, a driving unit fixed in the shell and driving the vibration unit to vibrate, and a flexible printed circuit board fixed in the shell and electrically connected to the driving unit. The linear vibration motor mainly uses a magnet for the vibration unit and a coil for the driving unit, while the coil requires extended coil wires to be connected to the flexible printed circuit board in order to realize an electrical connection with the flexible printed circuit board. The coil wires in the related technology are directly connected to the flexible printed circuit board, which is spaced from the shell. Although this design could avoid the phenomenon of poor insulation (poor conduction) caused by the coil and the shell due to the direct contact of the coil wires with the shell in a certain extent, the coil wires will still produce a certain movement when the linear vibration motor is running, which will cause the coil wires to come into direct contact with the shell, resulting in poor insulation between the coil and the shell. Therefore, it is necessary to provide a linear vibration motor to solve the above problems. SUMMARY The present disclosure is to provide a linear vibration motor which could solve the phenomenon of poor insulation between the coil and the shell caused by the coil wire coming into direct contact with the shell. To achieve the above purpose, the present invention provides a linear vibration motor including a shell with an accommodating cavity, a vibration unit elastically supported in the accommodating cavity, a driving unit fixed in the shell and driving the vibration unit to vibrate, an insulating layer attached to the shell, and a flexible printed circuit board fixed in the accommodating cavity and electrically connected with the driving unit. The vibration unit includes a magnet component. The driving unit is spaced apart from and directly opposite to the vibration unit, the driving unit includes a coil both fixed with the shell and the flexible printed circuit board by glue, the coil is electrically connected to the flexible printed circuit via a coil wire extending from the coil, the insulating layer is sandwiched between the coil wire and the shell. Further, the coil is in an annular shape, the flexible printed circuit board includes a main portion spaced apart from the coil and extending to outside of the shell, an annular portion fixed between the coil and the shell, and a connection portion connected with the main portion and the annular portion, the coil is attached to the annular portion, at least part of the coil is connected with the shell by glue. Further, the flexible printed circuit board is provided with a through hole running therethrough, the through hole runs through the connection portion and/or the annular portion. Further, the insulating layer is polyimide or a double-side adhesive. Further, the vibration unit further includes a mass block elastically supported in the shell, the magnet component includes a first magnet group and a second magnet group, the first magnet group is fixed to a side of the mass block close to the coil, the second magnet group is fixed to a side of the mass block far away from the coil. Further, the first magnet group includes three first magnets fixed with the side of the mass block close to the coil, the three first magnets are spaced apart in sequence along a vibration direction of the vibration unit, the second magnet group includes three second magnets fixed with the side of the mass block far away from the coil, the three second magnets are spaced apart in sequence along the vibration direction of the vibration unit, the three first magnets are arranged directly opposite to the three second magnets. Further, a first groove is inwardly recessed from the side of the mass block close to the coil, a second groove is inwardly recessed from the side of the mass block far away from the coil, the first magnet group is fixed in the first groove, the second magnet group is fixed in the second groove. Further, a first protruding portion is protruded and extended from a central region of the first groove, a middle magnet of the three first magnets is fixed to the first protruding portion, a second protruding portion is protruded and extended from a central region of the second groove, a middle magnet of the three second magnets is fixed to the second protruding portion. Further, the driving unit further includes an iron core fixed in the shell, the coil is wound around the iron core and sp