Multi-functional coil system for stringed instruments

• US 5,789,691 A
• Filed: 08/20/1996
• Issued: 08/04/1998
• Est. Priority Date: 01/17/1995
• Status: Expired due to Fees

• Current Assignee: Lafayette Ambassador Bank
• Original Assignee: Willi L. Stich
• Inventors: Stich, Willi L.
• Primary Examiner(s): Witkowski, Stanley J.
• Application Number:
  US08/701,253
• Time in Patent Office: 714 Days
• Field of Search: 84/726-728
• US Class Current: 84/726
• CPC Class Codes: G10H 3/181 Details of pick-up assemblies

Abstract

A multi-function coil for use in a magnetic pickup apparatus for transducing the mechanical motion of the stings of an instrument wound on a single coilform structured to separate the single continuous coil into first and second collinear segments in each of two winding spaces, each coil having a predetermined number of turns and being uniformly spaced one from the other, for substantially eliminating distortion and harsh sounding overtones by the reduction of the mutual inductance of the first and second segments of the single continuous coil.

Claims

1. A magnetic pickup for transducing the mechanical motion of the strings of an instrument into electrical signals for output to an audio amplifier, said pickup positioned proximally to and transversely underlying the strings and having a single coilform housed therein, said coilform structured to separate the single continuous coil of the pickup into first and second segments in each of two winding spaces, said first and second coil segments being collinear with and uniformly spaced apart a predetermined distance from the other and having a predetermined number of turns dependent upon the vertical dimension of each winding space and the proportional mass of each coil segment to the other, said first coil segment being located no more than a predetermined distance from the strings of the instrument and having a resistance across said first coil segment within a predetermined range to control counter-magnetic inductance between said coil segments, whereby the counter-magnetic inductance of the first and second coil segments of the single continuous coil is reduced and the mutual inductance of the single continuous coil is maximized resulting in the frequency shifting of resonant peaks and reducing the dissipation effect of the output signal to eliminate distortion and transmission of harsh sounding overtones and produce ultra-clear reproduced sound.

2. The magnetic pickup of claim 1 wherein the reduction in the counter-magnetic inductance of the single continuous coil being achieved by restricting said predetermined spacing between the separate segments of the coil to within a range between 0.03 and 0.08 inches, restricting said predetermined distance between the strings of the instrument and the lower coil segment to within a range of 0.50 and 1.00 inches, and varying said resistance across said first coil segment within a range of 0 ohms to 100K ohms.

3. The magnetic pickup of claim 1 wherein the frequency shifting of resonant peaks and control of the counter-magnetic inductance being achieved by shunting the first coil segment of the single continuous coil with a variable resistor connected between the endpoint of said first coil segment and the tap point between the two coil segments of the single continuous coil, said resistor being adjustable over a range between 0 ohms and 100K ohms.

4. The magnetic pickup of claim 1 wherein the frequency shifting of resonant peaks and control of the counter-magnetic inductance being achieved by shunting the first coil segment of the single continuous coil with a variable resistor connected between the endpoint of said first coil segment and any point in the second coil segment of the single continuous coil, said resistor being adjustable over a range between 0 ohms and 100K ohms.

5. A single continuous coil for use in transducing the mechanical motion of a stringed musical instrument into electrical signals for output to an audio amplifier wound on a coilform, said coilform structured to separate the single continuous coil into first and second segments in each of two winding spaces, said first and second coil segments being collinear with and uniformly spaced apart a predetermined distance from the other and having a predetermined number of turns dependent upon the vertical dimension of each winding space and the proportional mass of each coil segment to the other, said first coil segment having a resistance across the coil segment within a predetermined range to control counter-magnetic inductance, whereby the counter-magnetic inductance of the first and second coil segments of the single continuous coil is reduced and the mutual inductance of the single continuous coil is maximized resulting in the frequency shifting of resonant peaks and reducing the dissipation effect of the output signal to eliminate distortion and transmission of harsh sounding overtones and produce ultra-clear reproduced sound.

6. The single continuous coil of claim 5 wherein the reduction in the counter-magnetic inductance of said continuous coil being achieved by restricting said predetermined spacing between the separate segments of the coil to within a range between 0.03 and 0.08 inches and varying said resistance across said first coil segment within a range of 0 ohms to 100K ohms.

7. The single continuous coil of claim 5 wherein the frequency shifting of resonant peaks and control of the counter-magnetic inductance being achieved by shunting the first coil segment of said continuous coil with a variable resistor connected between the endpoint of said first coil segment and the tap point between the two coil segments of the single continuous coil, said resistor being adjustable over a range between 0 ohms and 100K ohms.

8. The single continuous coil of claim 5 wherein the frequency shifting of resonant peaks and control of the counter-magnetic inductance being achieved by shunting the first coil segment of said continuous coil with a variable resistor connected between the endpoint of said first coil segment and any point in the second coil segment of the single continuous coil, said resistor being adjustable over a range between 0 ohms and 100K ohms.