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Electrical pickup for a stringed musical instrument

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Publication number
US3902394A
US3902394A US49482374A US3902394A US 3902394 A US3902394 A US 3902394A US 49482374 A US49482374 A US 49482374A US 3902394 A US3902394 A US 3902394A
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Prior art keywords
pole
pickup
coils
magnet
string
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Inventor
Willi Lorenz Stich
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NORLIN MUSIC Inc
Shawmut Capital Corp
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NORLIN MUSIC Inc
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    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10HELECTROPHONIC MUSICAL INSTRUMENTS
    • G10H3/00Instruments in which the tones are generated by electromechanical means
    • G10H3/12Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument
    • G10H3/14Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means
    • G10H3/18Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means using a string, e.g. electric guitar
    • G10H3/181Details of pick-up assemblies
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10HELECTROPHONIC MUSICAL INSTRUMENTS
    • G10H2220/00Input/output interfacing specifically adapted for electrophonic musical tools or instruments
    • G10H2220/461Transducers, i.e. details, positioning or use of assemblies to detect and convert mechanical vibrations or mechanical strains into an electrical signal, e.g. audio, trigger or control signal
    • G10H2220/505Dual coil electrodynamic string transducer, e.g. for humbucking, to cancel out parasitic magnetic fields
    • G10H2220/511Stacked, i.e. one coil on top of the other

Abstract

An electrical pickup for a stringed musical instrument includes a permanent magnet having one field polarity intersected by the string, a pair of coils, and each coil having a pole piece so arranged that the pole pieces are magnetically neutral and are thus not loaded magnetically but serve merely as inductors.

Description

United States Patent Stich 14 1 Sept. 2, 1975 [54] ELECTRICAL PICKUP FOR A STRINGED 3,588,311 6/1971 Zoller 84/1.15 MUSICAL INSTRUNIENT 3,657,461 4/1972 Freeman..... 84/1.15 3,668,295 6/1972 Broussard 84/1.15 Inventor: Willi Lorenz Stich, Antioch, Tenn- 3,711,619 1/1973 Jones et a1..... 84/1.15 Assigneez Norlin Music, Inc. Lincolnwood In 3,715,446 2/1973 Kosinski 84/1.15

[22] Filed: Aug 5 1974 FOREIGN PATENTS OR APPLICATIONS 451,658 91949 Ital 84 1.15 21 Appl. NOJ 494,823 I y Primary Examiner-Stephen J. Tomsky U-S. Assistant Examiner stanley Witkowski [51] Int. Cl. GlOH 3/08 Attorney, A ent, or FirmHill, Gross, Simpson, Van [58] Field Of Search 84/1.141.16; Santen Steadman Chiara & Simpson [56] References Cited [57] ABSTRACT UNITED STATES PATENTS An electrical pickup for a stringed musical instrument 2 263 973 11 /1941 OBrien 84/1.15 includes 6 Permanent magnet having one field Polarity 2,896,491 7/1959 Lover 1 1 84 1.15 intersected y the String, a P Of coils, and each Coil 3,236,930 2/1966 Fender 84/l.15 having a pole piece so arranged that the pole pieces 3,249,677 5/1966 Burns et a1 84/1.l6 are magnetically neutral and are thus not loaded mag- 3,483,303 12/1969 Warner 84/1.l5 netically but serve merely as inductors,

3,535,968 10/1970 Rickard 84/1.l5 3,571,483 3/1971 Davidson 84/1.16 5 Claims, 2 Drawing Figures ELECTRICAL PICKUP FOR A STRINGED MUSICAL INSTRUMENT BACKGROUND OF THE INVENTION SUMMARY OF THE INVENTION In this invention, the pole pieces of the pickup coils are disposed so as to be located in a neutral part of the magnetic field of the permanent magnet so that such pole pieces are not loaded magnetically.

Accordingly, it is an object of the present invention to provide a simplified construction for a good quality guitar pickup.

Another object of the present invention is to provide a guitar pickup that can be produced with virtually no additional tooling other than that which the manufacturerin this field already has.

Many other advantages, features and additional objects of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheet of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.

ON THE DRAWING FIG. 1 is an enlarged cross-sectional view of an electrical pickup shown adjacent to the string of a musical instrument; and

FIG. 2 is a wiring diagram thereof.

AS SHOWN ON THE DRAWINGS The principles of the present invention are particu- I larly useful when embodied in an electrical pickup for a stringed musical instrument, such as a guitar, such as shown in FIG. 1, the pickup being generally indicated by the numeral 10. The pickup is shown mounted on a guitar body, schematically shown at 11 in proximity to a steel string 12. The pickup 10 includes a perma nent magnet 13 which is so magnetized that one pole face 14 is directed toward the string 12, while the other pole face 15 at the opposite side thereof is directed away from the string 12. The magnet 13 has a magnetic field which, except for the string, is disposed in the ambient, and the string 12 intersects such magnetic field at a portion having a single polarity. for example, north.

The pickup 10 further includes a pair of coils l6, 17. Each of the coils l6, 17 comprises a bobbin or coil form 18 on which there is randomly wound a selected number of turns of a selected wire size. These are normally so constructed that they have the same number of turns and the same wire size in each coil, thus rendering the coils l6, 17 to be interchangeable. In FIG. 2, the left end of each coil represents the end of the wire that is against the center of the bobbin when winding of the coil begins. Although the coils are connected in series as shown, they are in fact connected in out-ofphase relationship to each other so that the one coil bucks or cancels signals in the other coil which are induced by interfering sources nearby, such as an amplifier transfonner. Thus, the present pickup is of the hum-bucking type.

Each of the coils 16, 17 has within its bobbin 18 an iron pole piece 19, 20 which are also alike. The pole pieces 19, 20 are so arranged that the end face of each which is directed toward the permanent magnet 13 is so disposed that it is proximate to the permanent magnet 13 at a point intermediate the poles thereof, thus making the pole pieces magnetically neutral, namely neither north nor south.

To assemble the device, each of the coils 16, 17 with its pole piece 19, 20 is disposed against the permanent magnet 13 and placed into a plastic cover 21, and any space left inside the cover is filled with an encapsulation compound 22, such as of the epoxy resin type.

The axes of the coils thus extend coaxially with each other in the direction of the length of the string 12 and parallel thereto.

The pickup 10 is normally constructed to have an extent in a direction transverse to all the strings so as to underlie all the strings 12 of a guitar.

Such assembly is greatly simplified by the fact that there are only four different components that need to be stocked, namely, a number of identical coil assemblies. a number of identical pole pieces, a number of unitary magnets, and a number of covers. The plastic covers can be those that are now in use in production. The molded bobbins 18 are commercially available as are the permanent magnets 13 which are of the ceramic type. The pole pieces are easy to construct without use of specialized tooling. It is thus shown that a particularly simple type of construction is provided wherein labor, materials and tooling for the manufacture thereof are truly minimized.

Notwithstanding such simplification, and for reasons not known, this particular pickup construction works fantastically well. A representative number of turns is 4,250 of No. 42 wire per coil. The number of turns does not particularly affect performance, but it does affect the impedance of the coil, and that number of turns stated for that size of wire produces an impedance which is good or usable for the average present commercial guitar amplifier. For amplifiers having less impedance than is now conventional, the number of turns would be correspondingly reduced as desired. Although it is not understood why this particular pickup construction works fantastically well, it is evident that the iron pole pieces are not loaded magnetically with the field from the permanent magnet, and yet they act as inductors for the coils, being disposed in a magnetically neutral location in the field.

Although various minor modifications may be suggested by those versed in the art, it should be understood that I wish to embody within the scope of the patent warranted hereon, all such embodiments as reasonably and properly come within the scope of my contribution to the art.

I claim as my invention:

1. An electrical pickup for a stringed musical instrument having ferromagnetic strings, said pickup comprising:

a. a pair of axially spaced coils arranged to have their axes extend along the length of an instrument string;

b. a permanent magnet disposed between said coils,

said magnet having a pole face of one polarity arranged to be directed toward the string, and a second pole face of opposite polarity arranged to be I directed away from the string; and

c. a pair of magnetic pole pieces respectively dis posed in said coils, each having an end face directed toward a magnetically neutral portion of said permanent magnet.

2. A pickup according to claim 1 in which said coils are connected in series in out-of-phase relationship to each other.

3. A pickup according to claim 1 in which said coils are-respectively disposed on a pair of bobbins, said bobbins, said magnet and said pole pieces being held together as a unit by encapsulating material.

4. A pickup according to claim 1 in which said coils,

said magnet. and said pole pieces are elongated in a direction transverse to the string length so as to be responsive to a plurality of parallel strings.

5. An electrical pickup for a stringed musical instrument having ferromagnetic strings, said pickup comprising:

a. a permanent magnet arranged to be supported with one pole directed toward an instrument string and the other pole directed away from the string so that only one polarity of its field is intersected by the instrument string;

b. a pair of coils connected in series in out-of-phase relationship; and

c. a pair of pole pieces respectively disposed in said coils and located so that the coils are disposed to be influenced by the magnetic field, each of said pole pieces being disposed against a central portion of said magnet between its poles so that said pole pieces are magnetically neutral.

Claims (5)

1. An electrical pickup for a stringed musical instrument having ferromagnetic strings, said pickup comprising: a. a pair of axially spaced coils arranged to have their axes extend along the length of an instrument string; b. a permanent magnet disposed between said coils, said magnet having a pole face of one polarity arranged to be directed toward the string, and a second pole face of opposite polarity arranged to be directed away from the string; and c. a pair of magnetic pole pieces respectively disposed in said coils, each having an eNd face directed toward a magnetically neutral portion of said permanent magnet.
2. A pickup according to claim 1 in which said coils are connected in series in out-of-phase relationship to each other.
3. A pickup according to claim 1 in which said coils are respectively disposed on a pair of bobbins, said bobbins, said magnet and said pole pieces being held together as a unit by encapsulating material.
4. A pickup according to claim 1 in which said coils, said magnet, and said pole pieces are elongated in a direction transverse to the string length so as to be responsive to a plurality of parallel strings.
5. An electrical pickup for a stringed musical instrument having ferromagnetic strings, said pickup comprising: a. a permanent magnet arranged to be supported with one pole directed toward an instrument string and the other pole directed away from the string so that only one polarity of its field is intersected by the instrument string; b. a pair of coils connected in series in out-of-phase relationship; and c. a pair of pole pieces respectively disposed in said coils and located so that the coils are disposed to be influenced by the magnetic field, each of said pole pieces being disposed against a central portion of said magnet between its poles so that said pole pieces are magnetically neutral.
US3902394A 1974-08-05 1974-08-05 Electrical pickup for a stringed musical instrument Expired - Lifetime US3902394A (en)

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4212220A (en) * 1977-10-21 1980-07-15 Helpinstill Charles T Magnetic sensor for a musical instrument and method of constructing same
US4269103A (en) * 1976-02-11 1981-05-26 Underwood John F Electromagnetic pickup for stringed musical instruments
US4364295A (en) * 1981-03-02 1982-12-21 Stich Willi L Musical instrument sound pickup and method of assembly thereof
US4442749A (en) * 1982-08-06 1984-04-17 Dimarzio Musical Instrument Pickups, Inc. Electrical pickup for a stringed instrument having ferromagnetic strings
US4878412A (en) * 1987-06-22 1989-11-07 Resnick Martin H Electromagnetic pickup for a stringed musical instrument having ferromagnetic strings and method
US5148733A (en) * 1990-03-05 1992-09-22 Seymour Duncan Corporation Pole piece for an electric string instrument to decrease magnetic flux intensity around strings
US5336845A (en) * 1993-01-04 1994-08-09 Actodyne General, Inc. Pick-up assembly for a stringed musical instrument
US5391831A (en) * 1990-10-10 1995-02-21 Thomas E. Dorn Electromagnetic musical pickup having U-shaped ferromagnetic core
US5401900A (en) * 1993-01-14 1995-03-28 Actodyne General, Inc. Mounting assembly for an acoustic pick-up
US5408043A (en) * 1990-10-10 1995-04-18 Thomas E. Dorn Electromagnetic musical pickups with central permanent magnets
US5418327A (en) * 1993-01-04 1995-05-23 Actodyne General, Inc. Mounting assembly
US5422432A (en) * 1990-10-10 1995-06-06 Thomas E. Dorn Electromagnetic pickup for a plural-string musical instrument incorporating a coil around a multi-laminate ferromagnetic core
US5438157A (en) * 1993-01-14 1995-08-01 Actodyne General, Inc. Acoustic pick-up assembly for a stringed musical instrument
US5464948A (en) * 1994-04-22 1995-11-07 Actodyne General, Inc. Sensor assembly for a stringed musical instrument
US5641932A (en) * 1995-01-19 1997-06-24 Actodyne General, Inc. Sensor assembly for stringed musical instruments
US5780760A (en) * 1997-01-13 1998-07-14 Gibson Guitar Corp. Guitar pickup switching system for three-pickup guitar
US5789691A (en) * 1995-01-17 1998-08-04 Stich; Willi L. Multi-functional coil system for stringed instruments
US5792973A (en) * 1997-01-10 1998-08-11 Gibson Guitar Corp. Pickup for stringed musical instrument
US5811710A (en) * 1997-03-14 1998-09-22 Dimarzio, Inc. Electromagnetic pickup for stringed musical instruments
US6111185A (en) * 1998-01-28 2000-08-29 Actodyne General, Inc. Sensor assembly for stringed musical instruments
US20050150364A1 (en) * 2004-01-12 2005-07-14 Paul Reed Smith Guitars, Limited Partnership Multi-mode multi-coil pickup and pickup system for stringed musical instruments
US20050150365A1 (en) * 2004-01-14 2005-07-14 Paul Reed Smith Guitars, Limited Partnership Bobbin and pickup for stringed musical instruments
US20060156911A1 (en) * 2005-01-15 2006-07-20 Stich Willi L Advanced magnetic circuit to improve both the solenoidal and magnetic functions of string instrument pickups with co-linear coil assemblies

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2263973A (en) * 1941-04-26 1941-11-25 Daniel P O'brien Musical instrument
US2896491A (en) * 1955-06-22 1959-07-28 Gibson Inc Magnetic pickup for stringed musical instrument
US3236930A (en) * 1962-05-11 1966-02-22 Columbia Records Distrib Corp Electromagnetic pickup for electrical musical instruments
US3249677A (en) * 1961-10-20 1966-05-03 Ormston Burns Ltd Pick-ups for guitars and coupling circuits therefor
US3483303A (en) * 1965-07-29 1969-12-09 Lorenzo A Warner Elongated pickup for metal stringed musical instruments having ferromagnetic shielding
US3535968A (en) * 1969-04-14 1970-10-27 Kaman Corp Adjustable electromagnetic pick-up for stringed musical instruments
US3571483A (en) * 1970-02-02 1971-03-16 Hammond Corp Variable reluctance guitar pickup system
US3588311A (en) * 1969-01-16 1971-06-28 Attila C Zoller Bi-directional electromagnetic pick-up device for stringed musical instruments
US3657461A (en) * 1970-12-21 1972-04-18 Quilla H Freeman Single pickup frequency control for stringed instrument
US3668295A (en) * 1971-03-31 1972-06-06 Paul Daniel Broussard Electromagnetic audio pickup for stringed musical instruments, with volume control means, and suitable for use with any type strings
US3711619A (en) * 1970-11-04 1973-01-16 R Jones Natural performance extended range pick-up device
US3715446A (en) * 1971-06-22 1973-02-06 Gulf & Western Industries Magnetic pickup for stringed musical instruments

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2263973A (en) * 1941-04-26 1941-11-25 Daniel P O'brien Musical instrument
US2896491A (en) * 1955-06-22 1959-07-28 Gibson Inc Magnetic pickup for stringed musical instrument
US3249677A (en) * 1961-10-20 1966-05-03 Ormston Burns Ltd Pick-ups for guitars and coupling circuits therefor
US3236930A (en) * 1962-05-11 1966-02-22 Columbia Records Distrib Corp Electromagnetic pickup for electrical musical instruments
US3483303A (en) * 1965-07-29 1969-12-09 Lorenzo A Warner Elongated pickup for metal stringed musical instruments having ferromagnetic shielding
US3588311A (en) * 1969-01-16 1971-06-28 Attila C Zoller Bi-directional electromagnetic pick-up device for stringed musical instruments
US3535968A (en) * 1969-04-14 1970-10-27 Kaman Corp Adjustable electromagnetic pick-up for stringed musical instruments
US3571483A (en) * 1970-02-02 1971-03-16 Hammond Corp Variable reluctance guitar pickup system
US3711619A (en) * 1970-11-04 1973-01-16 R Jones Natural performance extended range pick-up device
US3657461A (en) * 1970-12-21 1972-04-18 Quilla H Freeman Single pickup frequency control for stringed instrument
US3668295A (en) * 1971-03-31 1972-06-06 Paul Daniel Broussard Electromagnetic audio pickup for stringed musical instruments, with volume control means, and suitable for use with any type strings
US3715446A (en) * 1971-06-22 1973-02-06 Gulf & Western Industries Magnetic pickup for stringed musical instruments

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4269103A (en) * 1976-02-11 1981-05-26 Underwood John F Electromagnetic pickup for stringed musical instruments
US4212220A (en) * 1977-10-21 1980-07-15 Helpinstill Charles T Magnetic sensor for a musical instrument and method of constructing same
US4364295A (en) * 1981-03-02 1982-12-21 Stich Willi L Musical instrument sound pickup and method of assembly thereof
US4442749A (en) * 1982-08-06 1984-04-17 Dimarzio Musical Instrument Pickups, Inc. Electrical pickup for a stringed instrument having ferromagnetic strings
US4878412A (en) * 1987-06-22 1989-11-07 Resnick Martin H Electromagnetic pickup for a stringed musical instrument having ferromagnetic strings and method
US5148733A (en) * 1990-03-05 1992-09-22 Seymour Duncan Corporation Pole piece for an electric string instrument to decrease magnetic flux intensity around strings
US5408043A (en) * 1990-10-10 1995-04-18 Thomas E. Dorn Electromagnetic musical pickups with central permanent magnets
US5391831A (en) * 1990-10-10 1995-02-21 Thomas E. Dorn Electromagnetic musical pickup having U-shaped ferromagnetic core
US5422432A (en) * 1990-10-10 1995-06-06 Thomas E. Dorn Electromagnetic pickup for a plural-string musical instrument incorporating a coil around a multi-laminate ferromagnetic core
US5336845A (en) * 1993-01-04 1994-08-09 Actodyne General, Inc. Pick-up assembly for a stringed musical instrument
US5418327A (en) * 1993-01-04 1995-05-23 Actodyne General, Inc. Mounting assembly
US5430246A (en) * 1993-01-04 1995-07-04 Actodyne General, Inc. Dual coil pick-up assembly for a springed musical instrument
US5401900A (en) * 1993-01-14 1995-03-28 Actodyne General, Inc. Mounting assembly for an acoustic pick-up
US5438157A (en) * 1993-01-14 1995-08-01 Actodyne General, Inc. Acoustic pick-up assembly for a stringed musical instrument
US5464948A (en) * 1994-04-22 1995-11-07 Actodyne General, Inc. Sensor assembly for a stringed musical instrument
US5684263A (en) * 1994-04-22 1997-11-04 Actodyne General, Inc. Electromagnetic sensor assembly for musical instruments having a magnetic lining
US5789691A (en) * 1995-01-17 1998-08-04 Stich; Willi L. Multi-functional coil system for stringed instruments
US5641932A (en) * 1995-01-19 1997-06-24 Actodyne General, Inc. Sensor assembly for stringed musical instruments
US5792973A (en) * 1997-01-10 1998-08-11 Gibson Guitar Corp. Pickup for stringed musical instrument
US5780760A (en) * 1997-01-13 1998-07-14 Gibson Guitar Corp. Guitar pickup switching system for three-pickup guitar
US5811710A (en) * 1997-03-14 1998-09-22 Dimarzio, Inc. Electromagnetic pickup for stringed musical instruments
US6111185A (en) * 1998-01-28 2000-08-29 Actodyne General, Inc. Sensor assembly for stringed musical instruments
US20050150364A1 (en) * 2004-01-12 2005-07-14 Paul Reed Smith Guitars, Limited Partnership Multi-mode multi-coil pickup and pickup system for stringed musical instruments
US20050150365A1 (en) * 2004-01-14 2005-07-14 Paul Reed Smith Guitars, Limited Partnership Bobbin and pickup for stringed musical instruments
US7288713B2 (en) 2004-01-14 2007-10-30 Paul Reed Smith Guitars, Limited Partnership Bobbin and pickup for stringed musical instruments
US20060156911A1 (en) * 2005-01-15 2006-07-20 Stich Willi L Advanced magnetic circuit to improve both the solenoidal and magnetic functions of string instrument pickups with co-linear coil assemblies
US7227076B2 (en) * 2005-01-15 2007-06-05 Fender Musical Instruments Corporation Advanced magnetic circuit to improve both the solenoidal and magnetic functions of string instrument pickups with co-linear coil assemblies

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