Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having electrostatic element
Patent
1995-04-11
1997-10-14
Kuntz, Curtis
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Having electrostatic element
H04R 2500
Patent
active
056779631
ABSTRACT:
A closed-ended linear voice-coil actuator in which the effects of armature reaction are significantly reduced. The actuator includes a housing formed from longitudinal field plates and end plates which are connected together. A cylindrical or rectangular core of ferromagnetic material is mounted inside the housing with its ends connected to the end plates. Permanent magnets mounted on the field plates are used to produce a transverse magnetic field. A coil of wire is wound around a coil bobbin. The coil of wire and coil bobbin are disposed around the core and are free to move along its length. A coil mounting bracket is mounted to the coil winding to allow the user of the voice-coil actuator to attach a load. A hole is drilled through the core, thereby removing some of the ferromagnetic material of which the core is composed. By placing the hole at the center of the core where the magnetic field due to the permanent magnets is minimal, the field produced by those magnets remains substantially the same. However, the secondary magnetic field produced by the interaction between a current flowing through the coil and the ferromagnetic core is reduced, thereby lessening the effects of armature reaction. In addition, because the physical rigidity of the core is maintained, the structural strength of the device is not compromised.
REFERENCES:
patent: 3453400 (1969-07-01), Coen
patent: 3743870 (1973-07-01), Hunt
patent: 4751437 (1988-06-01), Gerard
patent: 4808955 (1989-02-01), Godkin et al.
J. Stupak, Jr. & G. Gogue, "Voice-Coil Actuators: Insight Into the Design," Intelligent Motion, Oct. 1989 Proceedings, pp. 241-253.
L. H. McCarty (Western Editor), "Linear Actuator Improves Accuracy/Speed of PCB Drilling," Design News, Feb. 12, 1990, pp. 238-239.
Brochure, BEI Motion Systems Company, "Voice Coil Actuators An Applications Guide," Oct. 1992, pp. 1-11.
A. C. Morcos, "Update on Voice Coil Actuators," Feature Report, Product Design and Development, Mar. 1994, pp. 59-60.
A. C. Morcos, "A Primer on Magnetic Circuit Design: Materials, Permeance Calculations, and Finite Element Analysis," Motion, Jan./Feb. 1993, pp. 3-4, 6, 8, 10, 12 & 14.
Morcos Anthony Charles
Morreale Anthony Peter
Barnie Rexford N.
BEI Electronics, Inc.
Kuntz Curtis
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