Noise sensing bobbin-coil assembly for amplified stringed musical instrument pickups

• US 7,189,916 B2
• Filed: 01/16/2006
• Issued: 03/13/2007
• Est. Priority Date: 01/19/1999
• Status: Expired due to Fees

• Current Assignee: Christopher Ian Kinman
• Original Assignee: Christopher Ian Kinman
• Inventors: Kinman, Christopher Ian
• Primary Examiner(s): DONELS, JEFFREY
• Application Number:
  US11/332,108
• Publication Number:
  US 20060112816A1
• Time in Patent Office: 421 Days
• Field of Search: 84725-728
• US Class Current: 84/726
• CPC Class Codes: G10H 2220/511 Stacked, i.e. one coil on top of the other
• CPC Class Codes: G10H 3/181 Details of pick-up assemblies

Abstract

A noise sensing bobbin-coil assembly for use in conjunction with a musical instrument pickup is disclosed. In particular, the bobbin of the bobbin-coil assembly is adapted to resist induced eddy currents thereby allowing a fewer number of coils to be used which in turn reduces undesirable interaction with the musical instrument pickup.

Claims

1. A noise sensing assembly for use with a stringed musical instrument pickup, the noise sensing assembly comprising:

at least one noise-sensing coil for electrically coupling with string sensing coil, the noise-sensing coil comprising a core, the core comprising a ferrite material whereby eddy current losses are reduced when a voltage is induced in the noise-sensing coil in order to cancel a noise voltage induced in the string-sensing coil.

2. The noise sensing assembly of claim 1, wherein the ferrite material is a composite ferrite material.

3. The noise sensing assembly of claim 1, wherein the core of the noise-sensing coil further comprises:

at least one end plate extending transversely of at least one end of the core; and

a coil of copper wire wound on the core.

4. The noise sensing assembly of claim 2, wherein the at least one end plate comprises two end plates extending transversely of opposite ends of the core.

5. The noise sensing assembly of claim 4, wherein the core and end plates of the noise-sensing coil are integrally formed from composite ferrite material.

26. The noise sensing assembly of claim 1 further comprising:

at least one string-sensing coil; and

a U-shaped shield encompassing a portion of the one string-sensing coil.

27. The noise sensing assembly of claim 26 wherein the U-shaped shield is a separate component from the core.

28. The noise sensing assembly of claim 26 wherein the U-shaped shield includes two sidewalls and a base, the sidewalls and base being integral.

6. A noise sensing assembly for use with a stringed musical instrument pickup, the noise sensing assembly comprising:

at least one noise-sensing coil for electrically coupling with a string sensing coil, the noise-sensing coil comprising a core, the core comprising steel laminations whereby eddy current losses are reduced when a voltage is induced in the noise-sensing coil in order to cancel a noise voltage induced in the string-sensing coil.

7. The noise sensing assembly of claim 6, wherein the noise-sensing coil further comprises:

at least one end plate extending transversely of at least one end of the core; and

a coil of copper wire wound on the core.

8. The noise sensing assembly of claim 7, wherein to at least one end plate comprises two end plates extending transversely of opposite ends of the core.

9. The noise sensing assembly of claim 6, wherein the steel laminations are electrically insulated from one another.

10. The noise sensing assembly of claim 6, wherein the steel laminations constitute core pins of substantially rectangular cross-section.

11. The noise sensing assembly of claim 10, wherein the core pins are substantially square in cross-section and are interposed between outer core pins which are of substantially circular crass-section.

12. The noise sensing assembly of claim 6, further comprising a string-sensing coil and steel side-walls adjacent to the coil.

13. The noise sensing assembly of claim 12, wherein the string-sensing coil has between 3,000 and 8,000 turns of 0.050 mm or 0.056 mm wire, end wherein the noise-sensing coil has between 1,000 and 4,000 turns of 0.063mm or 0.071 mm wire.

14. The noise sensing assembly of claim 12, wherein the noise-sensing coil is positioned adjacent the string-sensing coil.

15. The noise sensing assembly of claim 6, further comprising a string-sensing coil, wherein the string-sensing coil further comprises a core, and wherein the care of the noise-sensing coil and the core of the string-sensing coil each are connected to two end plates extending transversely of each end of each core to form a bobbin or former for each coil.

16. The noise sensing assembly of claim 15, wherein each coil further comprises copper wire wound on the bobbin or former.

17. The noise sensing assembly of claim 16, wherein the bobbin or former of the string-sensing coil further comprises a plurality of steel pole pieces extending in use in an axial direction through the core toward the instrument strings and away from the bobbin or former through the noise-sensing coil;

and the stringed musical instrument pickup further comprises a magnetizing means, the steel pole pieces transferring magnetic fields therefrom to the instrument strings.

18. The noise sensing assembly of claim 17, further comprising steel side-walls adjacent to the string-sensing coil.

19. The noise sensing assembly of claim 17, wherein the pole pieces extend through to stringed musical instrument pickup to a single bar magnet.

20. The noise sensing assembly of claim 17, wherein the pole pieces extend through the core of the string-sensing coil and wherein the magnetizing means is a pair of transversely spaced bar magnets.

21. The noise sensing assembly of claim 17, wherein the noise-sensing coil is positioned below the string-sensing coil.

22. The noise sensing assembly of claim 6 further comprising:

at least one string-sensing coil; and

a U-shaped shield encompassing a portion of the string-sensing coil.

23. The noise sensing assembly of claim 22 wherein the U-shaped shield is a separate component from the core.

24. The noise sensing assembly of claim 22 wherein the U-shaped shield includes two sidewalls and a base, the sidewalls and base being integral.

25. The noise sensing assembly of claim 6 wherein the steel laminations are at least partially H-shaped, the bridges of each H forming the core and a leg of the H forming an endplate.