Permanent magnet actuator with electric excitation coil,...

Details Permanent magnet actuator with electric excitation coil,... Permanent magnet actuator with electric excitation coil,...

2005-05-31

2005-05-31

Kuntz, Curtis (Department: 2643)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S400000

Reexamination Certificate

active

06901150

ABSTRACT:
To reduce the effects of disturbing electromagnetic effects on a loudspeaker of a mobile telephone, the loudspeaker is provided with a compensation coil in addition to an excitation coil. The compensation coil is series-connected with the excitation coil. However, it is dispensed of the need for playing a driving role by being bonded to the permanent magnet of the loudspeaker: It is shown that the harmful effects are reduced without stopping the loudspeaker from working.

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