Semi-radially-charged conical magnet for electromagnetic transducer

• US 20060239499A1
• Filed: 04/25/2005
• Published: 10/26/2006
• Est. Priority Date: 04/25/2005
• Status: Abandoned Application

• Current Assignee: Enrique M. Stiles
• Original Assignee: Enrique M. Stiles
• Inventors: Stiles, Enrique M.
• Application Number:
  US11/114,737
• Publication Number:
  US 20060239499A1
• Time in Patent Office: Days
• US Class Current: 381/421
• 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 2209/024 Manufacturing aspects of the magnetic circuit of loudspeaker or microphone transducers
• CPC Class Codes: H04R 9/025 Magnetic circuit

Abstract

An electromagnetic transducer such as an audio speaker, having a conical magnet, and an inner yoke and an outer yoke having conical surfaces for mating with the conical magnet. The conical magnet may be radially-charged, semi-radially-charged, or axially charged.

Claims

1. An electromagnetic transducer motor structure comprising:

an inner yoke having a conical outer surface;

an outer yoke having a conical inner surface; and

a conical magnet having a first surface magnetically coupled to the conical outer surface of the inner yoke, and a second surface magnetically coupled to the conical inner surface of the outer yoke.

2. The electromagnetic transducer motor structure of claim 1 wherein:

the conical magnet is semi-radially-charged.

3. The electromagnetic transducer motor structure of claim 1 wherein:

the conical magnet is radially-charged.

4. The electromagnetic transducer motor structure of claim 1 wherein:

the conical magnet is axially-charged.

5. The electromagnetic transducer motor structure of claim 1 wherein:

the conical magnet comprises a plurality of magnets.

6. The electromagnetic transducer motor structure of claim 5 wherein:

the conical outer surface of the inner yoke includes a plurality of flat surfaces which, together, approximate a conical shape;

the conical inner surface of the outer yoke includes a plurality of flat surfaces which, together, approximate a conical shape; and

each of the plurality of magnets comprises a flat magnet magnetically coupled to a respective one of the flat surfaces of the inner yoke and to a respective one of the flat surfaces of the outer yoke.

7. The electromagnetic transducer motor structure of claim 1 wherein:

the conical magnet has a conical angle between 1° and

89°

.

8. The electromagnetic transducer motor structure of claim 7 wherein:

the conical magnet has a conical angle between 15° and

75°

.

9. The electromagnetic transducer motor structure of claim 8 wherein:

the conical magnet has a conical angle between 30° and

60°

.

10. The electromagnetic transducer motor structure of claim 9 wherein:

the conical magnet has a conical angle between 40° and

50°

.

11. The electromagnetic transducer motor structure of claim 1 further comprising:

a first magnetic air gap defined between the inner and outer yokes;

a second magnetic air gap defined between the inner and outer yokes;

a first diaphragm assembly having a voice coil disposed within the first magnetic air gap; and

a second diaphragm assembly having a voice coil disposed within the second magnetic air gap.

12. The electromagnetic transducer motor structure of claim 11 wherein:

the first and second magnetic air gaps are at opposite ends of the outer yoke and are substantially coaxial.

13. The electromagnetic transducer motor structure of claim 12 wherein:

the inner yoke includes an axial opening forming a horn for the second diaphragm assembly;

wherein the first and second diaphragm assemblies generate sound in a same direction.

14. The electromagnetic transducer motor structure of claim 1 further comprising:

a diaphragm assembly including a diaphragm having a first conical orientation;

wherein the outer yoke has the first conical orientation;

whereby a motor structure of the electromagnetic transducer is disposed within a cone of the diaphragm.