Linear vibration motor

The present invention provides a linear vibration motor, which includes a shell with a receiving space and a vibrator and a stator both housed in the shell body. One of the vibrator and the stator includes a solenoid, the other of the vibrator and the stator includes a magnetic circuit structure having a magnetic conductive frame and four magnets surrounding the magnetic conductive frame. By virtue of the configuration of the invention, the magnetic field strength can be significantly enhanced. The magnetic conductive frame can not only be used for magnetic guiding and fixing the magnets, but also can be used for fixing the weight to simplify the assembly structure and improve the reliability. Further, the response speed of the linear vibration motor is fast, the acceleration is great and the frequency band is wide.

FIELD OF THE PRESENT DISCLOSURE

The present disclosure relates to the field of electrical transducers, more particularly to a linear vibration motor in a mobile device, for converting electrical signals into tactile feedbacks.

DESCRIPTION OF RELATED ART

With the development of electronic technology, portable consumer electronic products, such as mobile phones, handheld game consoles, navigation devices or handheld multimedia entertainment devices are more and more popular. These electronic products generally use linear vibration motors to perform system feedback, such as phone call prompt, information prompt, navigation prompt, vibration feedback of game machines, etc. Such a wide range of applications requires that the vibration motor has excellent performance and long service life.

In related technology, the vibration motor includes a shell, a vibrator arranged in the shell and a stator matched with the vibrator. The vibrator includes a weight and a magnet embedded in the weight. The stator includes a coil fixed on the shell. The vibration motor of this structure has slow response speed, small acceleration and narrow frequency band.

Therefore, it is necessary to provide a new linear vibration motor to solve the above technical problems.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENT

The present disclosure will hereinafter be described in detail with reference to an exemplary embodiment. To make the technical problems to be solved, technical solutions and beneficial effects of the present disclosure more apparent, the present disclosure is described in further detail together with the figure and the embodiment. It should be understood the specific embodiment described hereby is only to explain the disclosure, not intended to limit the disclosure.

Referring toFIGS. 1-2, the present invention provides a linear vibration motor100, which comprises a shell1with a first accommodation space, a vibrator2and a stator3housed in the shell1, and a spring4elastically supporting the vibrator2. One of the vibrator2and the stator3includes a solenoid31, and the other of the vibrator2and the stator3includes a magnetic circuit structure21. In the specific embodiment of the invention, the stator3includes the solenoid31, and the vibrator2includes the magnetic circuit structure21.

The magnetic circuit structure21includes a first magnet211, a second magnet212, a third magnet213, a fourth magnet214and a magnetic conductive frame215. The first magnet211, the second magnet212, the third magnet213and the fourth magnet214are respectively fixed on the magnetic conductive frame215.

The first magnet211and the second magnet212are respectively arranged at two ends of the solenoid31. Further, the first magnet211and the second magnet212are such arranged that one end of the first magnet211facing the second magnet212has the same magnetic pole to one end of the second magnet212facing the first magnet211. Here, the above-described same magnetic pole is defined as a first pole.

The third magnet213and the fourth magnet214are respectively arranged on both sides of the solenoid31. Further, the third magnet213and the second magnet214are such arranged that one end of the third magnet213facing the fourth magnet214has the same magnetic pole to one end of the fourth magnet214facing the third magnet213. Here, the described same magnetic pole is defined as a second pole. The second pole is different from the first pole. In the specific embodiment, the first pol is S-pole, and the second pole is N-pole.

Referring also toFIGS. 3-5, the magnetic conductive frame215has a second receiving space, a bottom wall216arranged parallel to a vibrator vibration direction of the vibrator2, a side wall217extending from an edge of the bottom wall216, and a through hole218penetrating the bottom wall216. The bottom wall216is rectangular, and includes two opposite first sides2161and two opposite second sides connecting the first sides2161. The side wall217includes two opposite first side walls2171extending from the first side2161along the vibration direction of the vibrator, and two opposite second side walls2172extending from the second side2162along a direction perpendicular to the vibration direction, respectively. The side wall217further includes two opposite third sidewalls2173extending from two opposite edges of the through hole along a direction perpendicular to the vibration direction. The third sidewall2173is parallel to the second sidewall2172. The first magnet211and the second magnet212are respectively fixed on inner surfaces of the two third sidewalls2173, and the third magnet213and the fourth magnet214are respectively fixed on inner surfaces of the two first sidewalls2171.

The first magnet211, the second magnet212, the third magnet213, the fourth magnet214and the solenoid31are all housed in the second receiving space. In addition, the first magnet211, the second magnet212, the third magnet213and the fourth magnet214are arranged to surround the solenoid31. By such a configuration that the magnets (in this embodiment four magnets) surround the solenoid31, the intensity of the magnetic field is significantly enhanced.

The solenoid31includes an iron core311and a coil312winding an outer surface of the iron core311. The solenoid31is fixed to the housing1through the iron core311, thereby forming the stator3.

The linear vibration motor100further includes two springs4housed in the shell1and arranged along the vibration direction of the vibrator2. The spring4is in the shape of “H”, including two columns41fixed at two relative intervals of the shell1and an elastic part42connecting the two columns41. The elastic part42is fixedly connected with the second side wall2172.

The vibrator2further includes two weights22fixed on both ends of the magnetic conductive frame215along the vibration direction of the vibrator2. The two weights22are respectively fixed on the outer surfaces of the two third side walls2173. Only the third side wall21with magnetic conducting function is disposed between the weight22and the first magnet211, and only the third side wall21is located between the weight22and the second magnet21273, thus the weights22are stably fixed by the magnetic attraction force.

The linear vibration motor of the present invention has the advantages as follows:

1. The magnetic field strength can be significantly enhanced by setting four magnets around the solenoid;

2. By setting the magnetic conductive frame, it can not only be used to conduct magnetic field and fix the magnet, but also be used to fix the weight to simplify the assembly structure and improve the reliability;

3. Fast response speed, large acceleration and wide frequency band.