Magnetic, variable-volume sound producing device

Details Magnetic, variable-volume sound producing device Magnetic, variable-volume sound producing device

1994-07-25

1996-07-16

Isen, Forester W.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having electrostatic element

381196, 381203, H04R 2500

Patent

active

055374824

ABSTRACT:
A magnetic and variable-volume sound producing device which comprises a housing member, a substantially planar acoustic-producing diaphragm supported along its peripheral edge by the housing, a spiral, multi-turn and electrically conductive coil fixedly secured to the diaphragm and adapted to be energized by an alternating voltage having a frequency within the range of approximately 100 Hz to 15,000 Hz to thereby cause the diaphragm to vibrate at a frequency determined by the applied alternating voltage in the presence of a magnetic field. A volume control permanent magnet is slidably mounted within the housing along a fixed predetermined path with respect to the coil and is connected to a manually operable lever means to be fixedly position at a predetermined physical location with respect to the coil along the predetermined path, whereby the volume of the audio output signal is determined by the physical position of the permanent magnet.

REFERENCES:
patent: 1560779 (1925-11-01), Grierson
patent: 1600980 (1926-09-01), Gerns
patent: 1609834 (1926-12-01), Rollinson
patent: 1621845 (1927-03-01), Koch
patent: 2805332 (1957-09-01), Bell
patent: 4330780 (1982-05-01), Masaki

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