Twin magnetic loop multifunctional vibrator-speaker transducer

The present invention relates to a multifunctional device, which is particularly applicable to a twin magnet loop (called TML) transducer with both vibrating and sound functions. The present invention integrates an inner and an outer magnet loop of TML into one device, which can be used as a vibrator and a speaker. A disc-shaped pole core, a flange bowl-shaped magnetic transfer, an annular pole piece, a cylindrical magnet and an annular magnet constitute the inner and outer magnetic loops; wherein the disc-shaped pole core is placed on the cylindrical magnet and centered with the flange bowl-shaped magnetic transfer; the annular magnet and the annular pole piece are overlaid together under the ring of the flange bowl-shaped magnetic transfer; the entire of the TML assembly is connected with a housing base via a resilient plate. Comparing with the existing technology, the present invention has the advantages of that it integrates the inner and the outer magnetic loop of TML into one multifunctional device and makes the device more compact and more efficiency.

FIELD OF TECHNOLOGY

The present invention relates to a multifunctional vibrator-speaker transducer, and more particularly, to a multifunctional vibrator-speaker transducer with twin magnetic loop (“TML”) structure.

BACKGROUND OF TECHNOLOGY

The incoming call display of a mobile communication terminal, such as a cell phone, usually presents in two forms: sound and/or vibration. In current technology, these two functions are realized by a ringer and vibrating motor respectively. With the developments in communication technology and constant renewal in consumers' desires, cell phones have been gradually growing in functions and shrinking in size. That trend requires fewer components and parts to be compact in size. By using TML structure, a single device, which integrates the vibrating and sound function, can reduce the number of components and save valuable space in cell phones.

SUMMARY OF THE INVENTION

When performing electro-acoustic conversion function, the said multifunctional device follows the same principle as dynamic acoustic products: the coil carrying a signal current in a constant magnetic field drives vibrating diaphragm to produce sound. However, when performing electro-vibration conversion function, the said multifunctional device does not follow the same principle as vibrating motor: when passing through the vibrating coil, the electrical signal produces alternating magnetic field, which interacts with the constant magnetic field generated by the TML assembly. Sequentially, since the vibrating coil is connected with the rigid sheet, the whole TML assembly vibrates the entire device by conveying the vibration to the housing via the resilient plate to achieve the purpose of prompting. In order to ensure the vibrating swing is strong enough, it is preferable to adjust the stiffness coefficient of the resilient plate and the overall mass of the TML assembly to keep the inherent frequency of the vibrating system at a preset value between 100 Hz˜200 Hz.

The objective of the present invention is achieved via the following technical solutions: The transducer in the present invention is integrated with inner and outer twin magnetic loops, and has vibrating and sound functions. The said transducer comprises a disc-shaped pole core, a flange bowl-shaped magnetic transfer, an annular pole piece, an inner and outer magnetic loops composed of a cylindrical and an annular magnets, wherein the pole piece is placed on the cylindrical magnet and centered with the flange bowl-shaped magnetic transfer; the annular magnet and the annular pole piece are overlaid together under the outer ring of the flange bowl-shaped magnetic transfer.

The disc-shaped pole core, the flange bowl-shaped magnetic transfer, the annular pole piece, the annular and the cylindrical magnet in the present invention are connected with the housing supporting base via a resilient plate so that either of the inner and outer loops can be used to produce sound, then the other can be used to provide driving magnetic field for the vibrating function of the device. A vibrating coil is inserted in the air gap, or spacing, of the said magnetic loop for vibrating functions; a rigid sheet is connected with the vibrating coil and integrated with the supporting housing. The said diaphragm used to produce sound may be polyester film, Perm alloy plate or voice diaphragms of other materials.

The inherent resonant frequency of the said unit, composed of the magnets, the voice coil and the vibrating diaphragm for accomplishing sound function, is preset a value above 400 HZ. The vibrating coil for performing vibrating function, the magnet, the resilient plate and the components of the entire TML form the vibrating system, of which the inherent resonant frequency is between 100–200 HZ.

The two magnets that form the TML may be elliptic columns and elliptic rings in shape; then the magnetic intervals between them are elliptic rings in shape; and correspondingly, all the components in the device, including the voice coil, the vibrating coil, the pole core, the magnetic transfer, the annular pole piece and the resilient plate are elliptic in shape too.

The present invention surpasses the existing technology by integrating an inner and an outer magnetic loop into one device and thus providing both vibrating and sound functions.

PREFERRED EMBODIMENTS

A detailed description of the present invention based on the description of the enclosed drawings is given below:

As shown inFIG. 1andFIG. 2, the TML multifunctional vibrator-speaker transducer comprises a vibrating diaphragm1(or a rigid piece), a voice coil2(or vibrating coil relevant to a rigid sheet1), a resilient plate3, a pole core4, a cylindrical magnet5, a magnetic transfer6, an annular magnet7, an annular pole piece8, a housing9, a vibrating coil10(or voice coil), a rigid sheet11(or a vibrating diaphragm relevant to the voice coil10) etc. The (said) transducer integrates inner and outer magnetic loop of TML into one device and has both vibrating and sound function. The disc-shaped pole core4, the flange bowl-shaped magnetic transfer6, the annular pole piece8, the cylindrical magnet5and the annular magnet7constitute the inner and outer magnetic loops, wherein the pole core4is placed on the cylindrical magnet8and centered with the magnetic transfer6; The annular magnet7and the annular pole piece8are overlaying each other under the magnetic transfer6.

The disc-shaped pole core4, the flange bowl-shaped magnetic transfer6, the annular pole piece8, the cylindrical magnet5and the annular magnet7are connected with the housing9via the resilient plate3such that either the inner or the outer magnetic loop can be used to produce sound, and the other magnetic loop can be used to provide driving magnetic field for vibrating purposes. The vibrating coil10is placed in the air gap, or spacing, of the said magnetic paths for vibrating purposes.

The rigid sheet11connects the vibrating coil10and is integrated with the supporting housing9. The voice coil2is placed in the air gap, or spacing, of the said magnetic paths for sound purposes and connected with the vibrating diaphragm1. The said vibrating diaphragm1for sound purposes can be polyester film, perm alloy plate or voice diaphragm of other materials.

The inherent resonant frequency of said unit, which is composed of the magnet, the voice coil and the vibrating diaphragm for sound purposes, is kept at a preset value above 400 HZ by adjusting the stiffness coefficient and mass of the vibrating diaphragm as well as the mass of the voice coil. For the unit composed of said vibrating coil10for vibrating purposes, the interpolated magnet, the resilient plate3and the entire of twin magnetic loops, its inherent resonant frequency are kept at a preset value between 100˜200 HZ by adjusting the stiffness coefficient of the resilient plate as well as the overall mass of the twin magnetic loops.

As shown inFIG. 3,FIG. 4,FIG. 5andFIG. 6, the two magnets5and7that form the TML in the present invention can be elliptical columns and elliptic rings in shape; then the air gap between them are elliptical rings in shape, and the corresponding voice coil2, the vibrating coil10, the pole core4, the flange magnetic transfer6, the annular pole piece8as well as the resilient plate3are also elliptical in shape.