As revolution of networking, digital video and communicating technologies, multimedia industry is continuously forward to a new high. The 3G age of cellphone, Blu-ray genration of media player and micro-electronics techniques, greatly contribute to the progress of highly-integrated electronic entertainment products. For the instance, a DVD player contains thousands of components. These components are able to convert the electrical energy into mechanical format, and subsequently driving other elements to rotate. Through re-arranging the particle with different polarizations, the magnetic signals can be generated and then be converted into electric impulse, and finally deliver the recognised signals to the media player. Bearings, as the key of components’ linkages, its performance will seriously affect the overall features of the equipments.

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