Speaker apparatus

Details Speaker apparatus Speaker apparatus

2006-03-21

2006-03-21

Le, Huyen (Department: 2646)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S400000, C381S412000, C381S409000

Reexamination Certificate

active

07016515

ABSTRACT:
In an electromagnetic induction type speaker apparatus, individual constants are set in such a manner that the following formula is satisfiedin-line-formulae description="In-line Formulae" end="lead"?N×(R1×R2)1/2/(2π×L1×(1−k2)1/2>2000in-line-formulae description="In-line Formulae" end="tail"?where R1is the DC resistance of a primary coil; L1is the inductance of the primary coil; N is the number of turns of the primary coil; R2is the DC resistance of the secondary coil; L2is the inductance of the secondary coil; and k is the coupling coefficient of the primary coil and the secondary coil. In addition, the constants L1and l2are selected in such a manner that the ratio of the inductance L1and the inductance L2becomes equal to the ratio of the DC resistance R1and the DC resistance R2.

REFERENCES:
patent: 4300022 (1981-11-01), Hastings-James et al.
patent: 06292296 (1994-10-01), None

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