Transducer

• US 9,807,510 B2
• Filed: 05/11/2016
• Issued: 10/31/2017
• Est. Priority Date: 08/04/2015
• Status: Active Grant

• Current Assignee: Curtis E. Graber
• Original Assignee: Curtis E. Graber
• Inventors: Graber, Curtis E.
• Primary Examiner(s): Elahee, Md S
• Assistant Examiner(s): Dang, Julie X
• Application Number:
  US15/151,908
• Publication Number:
  US 20170041714A1
• Time in Patent Office: 538 Days
• Field of Search: 381401-415, 381422-425, 310 1215
• CPC Class Codes: H04R 1/021 incorporating only one transducer
• CPC Class Codes: H04R 2209/021 Reduction of eddy currents in the magnetic circuit of electrodynamic loudspeaker transducer
• CPC Class Codes: H04R 2209/022 Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils
• CPC Class Codes: H04R 9/025 Magnetic circuit
• CPC Class Codes: H04R 9/04 Construction, mounting, or centering of coil

Abstract

A transducer including a driven element and a magnet assembly. The magnet assembly is coupled to the driven element and includes a first and a second magnet, and a ferrous member. Each of the magnets have a first and second magnetic pole. The first magnetic pole of the first magnet and the first magnetic pole of the second magnet being proximate to each other and facing each other thereby defining a first magnetic zone therebetween, the first magnetic poles being similar, and the second magnetic poles being similar. The ferrous member couples a substantial amount of the magnetic field emanating from the second magnetic poles and directing the substantial amount of the magnetic field to a gap between the ferrous member and the first magnetic zone.

Claims

1. A transducer, comprising:

a driven element;

a magnet assembly coupled to said driven element, said magnet assembly including;

a first magnet having a first magnetic pole and a second magnetic pole;

a second magnet having a first magnetic pole and a second magnetic pole, said first magnetic pole of said first magnet and said first magnetic pole of said second magnet being proximate to each other and facing each other thereby defining a first magnetic zone therebetween, said first magnetic poles all being similar, and said second magnetic poles all being similar; and

a ferrous member coupling a substantial amount of a magnetic field emanating from said second magnetic poles and directing the substantial amount of the magnetic field to a gap between the ferrous member and the first magnetic zone wherein in the gap that is between said ferrous member and said first magnetic zone there is a substantially symmetrical magnetic field;

wherein the substantially symmetrical magnetic field extends beyond said gap.

2. The transducer according to claim 1, wherein a side of said magnet assembly is not shielded.

3. The transducer according to claim 1, wherein said ferrous member extends from said second magnetic poles along one side of said magnet assembly.

4. The transducer according to claim 1, further comprising an other ferrous member positioned between said first magnetic poles.

5. The transducer according to claim 1, wherein said driven element includes a voice coil and a collar, said voice coil being coupled to said collar, said voice coil being positioned in said gap.

6. The transducer according to claim 1, wherein said first magnetic zone has a magnetic field strength of at least 2 Tesla between said first magnetic zone and said ferrous member.

7. The transducer according to claim 6, wherein said magnetic field strength is at least 3 Tesla.

8. The transducer according to claim 1, wherein said ferrous member has a C shaped cross-section.

9. A speaker system, comprising:

an enclosure; and

a speaker mounted in said enclosure, the speaker including;

a driven element; and

a magnet assembly coupled to said driven element, said magnet assembly including;

a first magnet having a first magnetic pole and a second magnetic pole;

a second magnet having a first magnetic pole and a second magnetic pole, said first magnetic pole of said first magnet and said first magnetic pole of said second magnet being proximate to each other and facing each other thereby defining a first magnetic zone therebetween, said first magnetic poles all being similar, and said second magnetic poles all being similar; and

a ferrous member coupling a substantial amount of a magnetic field emanating from said second magnetic poles and directing the substantial amount of the magnetic field to a gap between the ferrous member and the first magnetic zone wherein in the gap that is between said ferrous member and said first magnetic zone there is a substantially symmetrical magnetic field;

wherein the substantially symmetrical magnetic field extends beyond said gap.

10. The speaker system according to claim 9, wherein a side of said magnet assembly is not shielded.

11. The speaker system according to claim 9, wherein said ferrous member extends from said second magnetic poles along one side of said magnet assembly.

12. The speaker system according to claim 9, further comprising an other ferrous member positioned between said first magnetic poles.

13. The speaker system according to claim 9, wherein said driven element includes a voice coil and a collar, said voice coil being coupled to said collar, said voice coil being positioned in said gap.

14. The speaker system according to claim 9, wherein said first magnetic zone has a magnetic field strength of at least 2 Tesla between said first magnetic zone and said ferrous member.

15. The speaker system according to claim 14, wherein said magnetic field strength is at least 3 Tesla.

16. The speaker system according to claim 9, wherein said ferrous member has a C shaped cross-section.