Permanent magnet actuator with electric excitation coil,...

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic

Reexamination Certificate

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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.

REFERENCES:
patent: 2727949 (1955-12-01), Lokkesmoe
patent: 3881074 (1975-04-01), Kawamura
patent: 4132861 (1979-01-01), Frieder et al.
patent: 4243839 (1981-01-01), Takahashi et al.
patent: 4427845 (1984-01-01), Yoshida
patent: 4529846 (1985-07-01), Freeman et al.
patent: 5448620 (1995-09-01), Gershkovich et al.
patent: 5602931 (1997-02-01), Geisenberger
patent: 5717775 (1998-02-01), Sakamoto et al.
patent: 5757945 (1998-05-01), Sakamoto
patent: 5937076 (1999-08-01), Tanabe et al.
patent: 6175637 (2001-01-01), Fujihira et al.
patent: 6359996 (2002-03-01), Ohashi
patent: 6373958 (2002-04-01), Enomoto et al.
patent: 6404896 (2002-06-01), Yoo et al.
patent: 6542617 (2003-04-01), Fujihira
patent: 03064387 (1991-03-01), None
patent: 06014393 (1994-01-01), None
patent: PCT/US94/00020 (1994-01-01), None
patent: WO 94/16536 (1994-07-01), None

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