Electromagnetic shielding material, electromagnetic shielding shell and voice coil motor
A technology of electromagnetic shielding materials and electromagnetic shielding shells, applied in the fields of magnetic field/electric field shielding, electrical components, electromechanical devices, etc., can solve problems such as electromagnetic field leakage, poor magnetic field shielding effect, and influence on voice coil motors
Inactive Publication Date: 2011-01-26
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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Problems solved by technology
[0004] Voice coil motors usually have a housing which is made of metal which provides some shielding against electric fields but not very well against magnetic fields
If the electromagnetic field cannot be effectively shielded, the resulting electromagnetic field leakage will affect the normal operation of components other than the voice coil motor, and failure to effectively shield the electromagnetic field outside the voice coil motor will also affect its internal work
Method used
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[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0013] see figure 1 with figure 2 In the voice coil motor 1 provided by the embodiment of the present invention, the electromagnetic shielding case 100 is made of the electromagnetic shielding material provided by the present invention, and has a nickel-iron alloy layer 10 and a metal film 20 .
[0014] Generally, the higher the magnetic permeability, the higher the conductivity, and the thicker the shielding layer of the electromagnetic shielding material, the better its shielding effect on electromagnetic waves.
[0015] The nickel-iron alloy layer 10 is composed of nickel and iron. The metal film 20 is an alloy of nickel, iron, copper, and molybdenum, which is plated on at least one surface of the nickel-iron alloy layer 10 or covers the entire nickel-iron alloy layer 10, wherein the nickel, iron, copper, and molybdenum particles can be nanoparticles ....
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Abstract
The invention provides an electromagnetic shielding material used for manufacturing a shell of a voice coil motor. The electromagnetic shielding material comprises a nickel-iron alloy layer, wherein at least one surface of the nickel-iron alloy layer is plated with a metal film, and the metal layer is manufactured of alloy of nickel, iron, copper and molybdenum. The invention also provides an electromagnetic shielding shell manufactured by adopting the electromagnetic shielding material and the voice coil motor adopting the electromagnetic shielding shell as the shell. The electromagnetic shielding material, the electromagnetic shielding shell and the voice coil motor can be used for better shielding an electromagnetic field.
Description
technical field [0001] The invention relates to an electromagnetic shielding material, an electromagnetic shielding case made of the electromagnetic shielding material and a voice coil motor using the electromagnetic shielding case. Background technique [0002] Shielding can be used to control the propagation of electric or magnetic fields from one area of space to another, which is the most effective means to overcome electric field coupling interference or magnetic field coupling interference. Generally, the propagation medium has an absorption effect, and this absorption effect attenuates the intensity of electromagnetic waves, that is, penetration loss, and this attenuation follows an exponential law. [0003] At present, many camera modules with zoom and focus functions use voice coil motors to drive the lens group to move. The voice coil motor is named after the voice coil used in the loudspeaker. It uses high-performance permanent magnets, which can realize the mi...
Claims
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IPC IPC(8): H02K5/02H05K9/00
CPCH02K41/0356H02K11/0005H02K11/0141
Inventor 陈杰良
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD