Driver assembly for loudspeakers

• US 8,571,252 B2
• Filed: 12/23/2011
• Issued: 10/29/2013
• Est. Priority Date: 12/23/2011
• Status: Expired due to Fees

• Current Assignee: GGEC America, Inc. (Guoguang Electric Company Limited)
• Original Assignee: GGEC America, Inc. (Guoguang Electric Company Limited)
• Inventors: North, Donald J., Farr, Thomas Richard
• Primary Examiner(s): Ensey, Brian
• Assistant Examiner(s): Yu, Norman
• Application Number:
  US13/336,882
• Publication Number:
  US 20130163806A1
• Time in Patent Office: 676 Days
• Field of Search: 381/305, 381/345, 381/351, 381/355, 381/397
• US Class Current: 381/396
• CPC Class Codes: H04R 2209/021 Reduction of eddy currents in the magnetic circuit of electrodynamic loudspeaker transducer
• CPC Class Codes: H04R 9/025 Magnetic circuit

Abstract

In one embodiment, a loudspeaker system is provided comprising a motor assembly for driving a diaphragm assembly, where the motor assembly includes a pole piece configured to receive an inductance sleeve. The motor assembly also comprises a permanent magnet, a first shorting ring, and a second shorting ring, with the first and second shorting ring being positioned at least partially within an air gap adjacent the pole piece, and with the first ring positioned adjacent a first side of the permanent magnet and the second shorting ring positioned adjacent a second side of the permanent magnet. The permanent magnet preferably is preferably coated with an insulative material, and may also comprise a plurality of arcuate segments.

Claims

1. A loudspeaker system comprising a motor assembly for driving a diaphragm assembly, the motor assembly including a pole piece configured to receive an inductance sleeve, the motor assembly comprising at least one permanent magnet component, a first shorting ring, and a second shorting ring, the first and second shorting ring being positioned at least partially within an air gap adjacent the pole piece, the first ring positioned adjacent a first side of the at least one permanent magnet component and the second shorting ring positioned adjacent a second side of the at least one permanent magnet components such that all permanent magnet components of the motor assembly are located between the first and second shorting rings.

2. The loudspeaker system of claim 1, wherein the at least one permanent magnet component comprises an insulative coating material.

3. The loudspeaker system of claim 2, wherein the at least one permanent magnet component comprises a plurality of arcuate segments.

4. The loudspeaker system of claim 1, further comprising an inductance sleeve.

9. The loudspeaker system of claim 1, wherein the at least one permanent magnet component comprises a metallic plating.

5. A loudspeaker system comprising a motor assembly for driving a diaphragm assembly, the motor assembly including a pole piece configured to receive an inductance sleeve, the motor assembly comprising a permanent magnet and a first shorting ring, the permanent magnet being coated with an insulative material, and the magnet and first shorting ring being positioned within an air gap adjacent the pole piece.

6. The loudspeaker system of claim 5, wherein the permanent magnet comprises a plurality of arcuate segments.

7. The loudspeaker system of claim 5, further comprising a second shorting ring, the second shorting ring being positioned at least partially within an air gap adjacent the pole piece, the first ring positioned adjacent a first side of the permanent magnet and the second shorting ring positioned adjacent a second side of the permanent magnet.

8. The loudspeaker system of claim 5, further comprising an inductance sleeve.