Vibration motor

A vibration motor, including: a shell having accommodating space, a driving device accommodated in the accommodating space, a vibrator, and an elastic component elastically supporting the vibrator; the elastic component includes a first fixing portion connected with the shell, a second fixing portion connected with the vibrator, and a deforming portion connecting the first fixing portion with the second fixing portion; the deforming portion includes at least two elastic arms and a bending portion connecting two adjacent elastic arms, the fixing portions move close to or away from each other under compression or stretching of the deforming portion, so that the vibrator vibrate along vibrating direction, a damping member is arranged at inner surface of the bending portion close to the two adjacent elastic arms. The present disclosure adopts a new elastic component, which can adjust system damping property while guaranteeing vibrator weight, so as to improve vibration performance.

TECHNICAL FIELD

The present disclosure relates to a vibration motor and, particularly, relates to a linear vibration motor vibrating along a horizontal direction.

BACKGROUND

With the development of electronic technologies, portable consumption electronic products such as cellphone, handheld game player, navigation device or handheld multimedia entertainment device and the like are becoming more and more popular. Generally, a vibration motor will be used for system feedback, such as call prompt, message prompt, navigation prompt of a cellphone, vibration feedback of a game player etc. Such widespread application requires high performance and long service life of the vibration motor.

In the prior art, a vibration motor normally includes a shell having accommodating space, a vibrator accommodated in the accommodating space and an elastic component respectively connected with the shell and the vibrator. The elastic component supports the vibrator to move reciprocally in the shell so as to generate vibration. In order to adjust damping property of the vibrator, a damping block is generally arranged between the elastic component and the vibrator. However, the vibrator of such a structure needs space for installation of the damping block. Therefore, in a certain extent, total weight of the vibrator is compromised, which influences vibration performance of the product.

Therefore, a new vibration motor is necessary to solve the above-mentioned problems.

DESCRIPTION OF EMBODIMENTS

The present disclosure will be further illustrated as follows with reference to the drawings.

As shown inFIG. 1andFIG. 2, in an exemplary embodiment of the present disclosure, a vibration motor100includes a shell1having accommodating space, a vibrator2accommodated in the shell1, an elastic component3elastically supporting the vibrator2, and a driving device4driving the vibrator2to vibrate.

The shell1includes a cover plate11having a side wall and a bottom plate12which is connected with and covers on the cover plate11and forms accommodating space together with the cover plate11. The driving device4is fixed on the bottom plate12, and the elastic component3is fixed on the side wall of the cover plate11. In an embodiment, the driving device4is a coil, the vibrator2is a magnetic vibrator having a magnet. In other alternative embodiments, it is also applicable that the driving device is a magnet, and the vibrator is provided with a coil, as long as the vibrator and the driving device can interact with each other so as to drive the vibrator to vibrate.

In an exemplary embodiment, the vibrator2includes a weight21and a magnet22arranged on the weight21. Specifically, the weight21is provided with a through hole210, the through hole210penetrate through the weight21along a direction perpendicular to a vibrating direction, and the magnet22is arranged in the through hole210. The magnet22is arranged opposite to the coil. After the coil is energized, the magnet22and the coil interact with each other so as to drive the vibrator2to vibrate along a direction parallel to the bottom plate12.

The magnet22includes a plurality of first magnets221arranged in interval and a plurality of second magnets222arranged between two adjacent first magnets221. The second magnet222is symmetrically arranged with respect to the central axis of the coil. The first magnet221is a permanent magnet, the second magnet222can either be a permanent magnet having a magnetizing direction different from the first magnet, or the second magnet222may not be a permanent magnet, which only has the function of magnet conducting. Such a structure is for the sake of making the magnetic induction lines forming the magnetic field go through the coil maximally, so as to improve electromagnetic induction efficiency. Specifically, in an embodiment, there are three first magnets221in total, two second magnets222are clamped thereamong, the corresponding driving device4has two coils respectively arranged corresponding to the two second magnets222. Further, the vibrator2also includes a magnetic conductive member23attached on the weight21and the magnet22, which is used to gather the diverging magnetic induction lines, so as to improve magnetic induction intensity.

Referring toFIG. 2andFIG. 3, in an exemplary embodiment, there are three elastic components in total, which are respectively arranged at two sides of the weight21. Specifically, each elastic component3respectively includes two fixing portions31and a deforming portion32connecting the two fixing portions31. The two fixing portions31include a first fixing portion311connected with the shell1and a second fixing portion312connected with the weight21. The fixing portions31move as the vibrator vibrates so as to be close to or away from each other, so that the elastic portion of the elastic component3deforms to provide a restoring force. The vibrator moves reciprocally along the vibrating direction.

Referring toFIG. 3, the deforming portion32includes at least one deformable bending portion321and at least two elastic arms322extended from the bending portion321, and the elastic arm322is connected with the fixing portion31or with the adjacent bending portion321. Specifically, in an embodiment, the elastic component is a V-shaped spring, the deforming portion32thereof includes a bending portion321and two elastic arms322connecting two sides of the bending portion with two fixing portion31. In an embodiment, the bending portion321is shaped in a semi-circular arc structure. A damping member33is arranged in the inner surface of the bending portion321close to adjacent two elastic arms322. When the vibration motor is vibrating, the elastic component3will press or release the damping member, so as to achieve the function of system damping adjustment.

Further, a buffer member34for collision avoidance is arranged between the first fixing portion311and the second fixing portion312. The buffer member34normally adopts soft material such as foam and the like, which can avoid collision of the vibration motor when dropping off or during, over vibration so as to avoid product reliability from being influenced.

Optionally, bending directions of the bending portions321of the two elastic components3at two sides of the weight21are opposite to each other. In an embodiment, the two elastic components3at two sides are structured in central symmetry, that is, the fixing portions31of the two elastic component3are respectively fixed at two diagonal opposite corners of the weight21so as to prevent longitudinal shift of the weight21maximally, thereby guarantee vibration stability.

In other alternative embodiments, the elastic component3can also be of other shapes, such as an S-shaped spring. The deforming portion32has two or more bending portions321, the opening directions of the adjacent two bending portions are opposite to each other, that is, the bending directions of the two adjacent bending portions are correspondingly arranged. At this time, the damping member can be arranged in the bending portion closest to the vibrator side, and can also be arranged in another one or more bending portions. Besides, the number of the elastic component3is not limited here. Specifically, the spring structure in the following embodiment can be referred to.

As shown inFIG. 4andFIG. 5, in another exemplary embodiment of the present disclosure, a vibration motor200includes a shell201, a vibrator202, an elastic component203elastically supporting the vibrator202to vibrate and a driving device204driving the vibrator202to vibrate.

In an embodiment, the driving device204is an electromagnet fixed on the shell201, that is, includes a coil and an iron core used to fix the coil.

The vibrator202includes a weight2021and a magnet2022fixed on the weight2021. The weight2021is provided with a through hole located at the center, the through hole penetrates through the weight2021along a direction perpendicular to a vibrating direction. The weight2021includes an inner wall defining the through hole, the magnet2022is fixed on the inner wall. The electromagnet is fixed on the shell and extends into the through hole to be arranged corresponding to the magnet2022. The magnet2022drives the vibrator to vibrate under the electromagnet effect.

The elastic component203includes a first fixing portion20311and a second fixing portion20312respectively fixed with the shell201and the vibrator202, and a deforming portion2032connecting the two fixing portions2031. The fixing portions2031move as the vibrator vibrates so as to be close to or away from each other, so that the elastic portion of the elastic component203deforms to provide a restoring force, the vibrator moves reciprocally along the vibrating direction. In an embodiment, the elastic component203is an S-shaped spring, the deforming portion2032includes two bending portions20321, and the opening directions of the two bending portions20321are opposite to each other. Absolutely, in other alternative embodiments, it is also possible that there can also be more than two bending portions20321, the opening directions of two connected adjacent bending portions20321are opposite to each other. A damping member2033is arranged in the bending portion20321. It is also possible that the damping member2033can be arranged at the inner surface of the bending portion20321close to the adjacent two elastic arms2032, and can also be arranged in the bending portion closest to the vibrator side. When the vibration motor is vibrating, the elastic component203will press or release the damping member, so as to achieve the function of system damping adjustment.

In an embodiment, there are four elastic components203in total, which are grouped in pair and arranged at two sides of the vibrator. Two elastic components203at the same side are arranged in stagger up and down, and the bending portions20321of the two elastic components203up and down are arranged correspondingly, that is, the two adjacent elastic components203at the same side of the vibrator are arranged in central symmetry. Thus, it is possible to improve fixing stability of the elastic component203and the vibrator202, so as to further improve vibration performance of the vibrator202.

The present disclosure adopts an elastic component of a new type vibration motor, filling the bending portion of the deforming portion with a damping member can adjust system damping characteristic on the basis of guaranteeing vibrator weight, so as to improve product reliability.

Although the embodiments have been described and explained, it should be understood that, the above embodiments are only exemplary, which cannot limit the present disclosure. Those skilled in the art can make modifications, alternations and replacements within the scope of the present disclosure.