Double resonance vibration motor

The present disclosure is related to vibration motors, specifically related to a double resonance vibration motor for portable consumer electronic products.

A vibration motor is applied to feedback of system generally, for example, incoming call prompt, message prompt and navigation prompt of mobile phone, vibration feedback of game player, etc. for portable consumer electronic products, such as mobile phone, handheld game player, navigation unit or handheld multimedia entertainment equipment which is more and more popular with people along with the development of the electronic technique.

The vibration motor currently used in portable consumer electronic products includes generally a housing, a base which forms an accommodation space with the housing, and a single vibration system fixed in the accommodation space. As one vibration system has only one natural resonant frequency, the vibration motor in such traditional structure has also only one resonance frequency. If two resonance frequencies are required in a terminal device equipped with such vibration motor, two vibration motors are needed thereby. Two vibration motors will inevitably take up more space, not in favor of minimized development trend of terminals at present.

Therefore, an improved vibration motor which can overcome the problems mentioned above is accordingly desired.

Many aspects of the embodiment can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is an isometric and exploded view of a double resonance vibration motor in accordance with an exemplary embodiment of the present disclosure.

FIG. 2 is a top view of the double resonance vibration motor in FIG. 1 , wherein an upper cover and a pole plate is removed.

The present invention 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 present disclosure more apparent, the present disclosure is described in further detail together with the figures and the embodiment. It should be understood the specific embodiment described hereby is only to explain this disclosure, not intended to limit this disclosure.

As shown in FIGS. 1-2 , a double resonance vibration motor 100 , in accordance with an exemplary embodiment of the present disclosure, includes a housing, a vibration part 103 installed in the housing, a coil 104 fixed in the housing and an elastic connector to support elastically the vibration part 103 in the housing. The housing includes an upper cover 101 and a cover plate 102 which forms an accommodation space with the upper cover 101 . The upper cover 101 is composed of a first side wall 101 A and a second side wall 101 B which are parallel and opposite to each other, as well as a third side wall 101 C and a fourth side wall 101 D which are connected with the first side wall 101 A and the second side wall 101 B. The third side wall 101 C and the fourth side wall are parallel and oppose to each other.

The vibration parts 103 includes a mass block 103 A, a first magnet group 103 B and a second magnet group 103 C installed in the mass block 103 A. The first magnet group 103 B includes a first pair of magnets which are opposite to each other. The second magnet group 103 C includes a second pair of magnets which are opposite to each other. The vibration motor 100 also includes a pole plate 107 which covers the first magnet group 103 B and the second magnet group 103 C.

In this embodiment, the coil 104 is roughly rectangular and is connected from end to end, including a first side, a second side, a third side and a fourth side. The first pair of magnets are opposite respectively to the first side and the third side. The second pair of magnets are opposite respectively to the second side and the fourth side. The connecting line of the first pair of magnets and the connection line of the second pair of magnets are intersected vertically. When the coil 104 is electrified, the first direction's driving force is generated between the coil 104 and the first magnet group 103 B. The second direction's driving force is generated between the coil and the second magnet group 103 C. The first direction (i.e. X direction) and the second direction (i.e., Y direction) are intersected vertically. The coil 104 can be also in circular. But when the coil 104 is in roughly rectangular, when the first pair of magnets and the second pair of magnets are corresponding to four sides of the coil, the efficiency of the magnetic field is highest.

The vibration part 103 has a resonance frequency f 1 in X direction and has a resonance frequency f 2 in Y direction. When the coil 104 is inputted with a certain frequency signal (e.g., f 1 ), the vibration part 103 is under stress in both X, Y directions. When the difference between f 1 frequency and f 2 frequency is large, the vibration amplitude of the vibration part 103 is biggest in resonant direction and the vibration sense is bigger. The vibration amplitude in disresonance direction is very small and the vibration sense can be ignored.

As mentioned earlier, when the coil 104 is inputted with f 1 frequency signal, the vibration part 103 has resonant vibration in X direction. When the vibration part 103 is driven by the driving force in X direction, the vibration has a resonance frequency f 1 . As vibrated under the driving force in f 1 frequency in Y direction at this time, the vibration amplitude is very small and the vibration sense can be ignored.

When the coil 104 is inputted with f 2 frequency signal, the vibration part 103 has resonant vibration in Y direction. When the vibration part 103 is driven by the driving force in Y direction, the vibration has a resonance frequency f 2 . As vibrated under the driving force in f 2 frequency in X direction at this time, the vibration amplitude is very small and the vibration sense can be ignored.

When the coil 104 is inputted with f 1 frequency signal and f 2 frequency signal at the same time, two resonant frequencies can work at the same time. There are the vibration sense of f 2 frequency in X direction, also the vibration sense of f 2 frequency in Y direction, not affected each other. The vibration of two directions can be combined together to realize the vibration control of different directions.

The mass block 103 A includes a first side panel 1031 A near the first side wall 101 A and a second panel 1032 A near the second side wall 101 B. The elastic connectors include a first elastic connector 108 and a second elastic connector 109 . The first elastic connector 108 includes a first fixing part which connects respectively both ends of the second side panel 1032 A, as well as a first connecting part 108 B which connects the stated two fixing part 108 A. There are two bending areas 108 C on the first connecting part 108 B. Two bending areas 108 C can be attached respectively with the third side wall 101 C and the fourth side wall 101 D, or kept a gap with the third side wall 101 C and the fourth side wall 101 D. The first connecting part 108 B is fixed with the first side wall 101 A. The second elastic connector 109 includes a second fixing part 109 A which connects respectively both ends of the first side panel 1031 A, and a second connecting part 109 B which connects the stated two second fixing parts 109 A. There are also two bending areas 109 C on the second connecting part 109 B. Two bending areas 109 C can be attached respectively with the third side wall 101 C and the fourth side wall 101 D, or kept a gap with the third side wall 101 C and the fourth side wall 101 D. The second connecting part 109 B is fixed with the second side wall 101 B. Each elastic connector is fixed respectively with both ends of the mass block 103 A. This structure can restrict displacement of the vibration part 103 in the direction vertical to vibration direction and ensure the stability of single direction vibration.

The double resonance vibration motor 100 has one resonance frequency respectively in each of two different directions. Two different resonant frequencies can vibrate alone or at the same time, so as to control the vibration in different directions. One vibration part and one voice coil only can realize double resonance. The structure is simple and the stability of vibration is high.

It is to be understood, however, that even though numerous characteristics and advantages of the present exemplary embodiment have been set forth in the foregoing description, together with details of the structures and functions of the embodiment, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.