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Publication numberUS3902394 A
Publication typeGrant
Publication date2 Sep 1975
Filing date5 Aug 1974
Priority date5 Aug 1974
Publication numberUS 3902394 A, US 3902394A, US-A-3902394, US3902394 A, US3902394A
InventorsWilli Lorenz Stich
Original AssigneeNorlin Music Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electrical pickup for a stringed musical instrument
US 3902394 A
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.
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Description  (OCR text may contain errors)

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.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2263973 *26 Apr 194125 Nov 1941O'brien Daniel PMusical instrument
US2896491 *22 Jun 195528 Jul 1959Gibson IncMagnetic pickup for stringed musical instrument
US3236930 *11 May 196222 Feb 1966Columbia Records Distrib CorpElectromagnetic pickup for electrical musical instruments
US3249677 *19 Oct 19623 May 1966Ormston Burns LtdPick-ups for guitars and coupling circuits therefor
US3483303 *29 Jul 19659 Dec 1969Warner Lorenzo AElongated pickup for metal stringed musical instruments having ferromagnetic shielding
US3535968 *14 Apr 196927 Oct 1970Kaman CorpAdjustable electromagnetic pick-up for stringed musical instruments
US3571483 *2 Feb 197016 Mar 1971Hammond CorpVariable reluctance guitar pickup system
US3588311 *16 Jan 196928 Jun 1971Zoller Attila CBi-directional electromagnetic pick-up device for stringed musical instruments
US3657461 *21 Dec 197018 Apr 1972Freeman Quilla HSingle pickup frequency control for stringed instrument
US3668295 *31 Mar 19716 Jun 1972Broussard Paul DanielElectromagnetic audio pickup for stringed musical instruments, with volume control means, and suitable for use with any type strings
US3711619 *4 Nov 197016 Jan 1973Jones RNatural performance extended range pick-up device
US3715446 *22 Jun 19716 Feb 1973Gulf & Western IndustriesMagnetic pickup for stringed musical instruments
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4212220 *21 Oct 197715 Jul 1980Helpinstill Charles TMagnetic sensor for a musical instrument and method of constructing same
US4269103 *30 Jun 197726 May 1981Underwood John FElectromagnetic pickup for stringed musical instruments
US4364295 *2 Mar 198121 Dec 1982Stich Willi LMusical instrument sound pickup and method of assembly thereof
US4442749 *6 Aug 198217 Apr 1984Dimarzio Musical Instrument Pickups, Inc.Electrical pickup for a stringed instrument having ferromagnetic strings
US4878412 *9 Jan 19897 Nov 1989Resnick Martin HElectromagnetic pickup for a stringed musical instrument having ferromagnetic strings and method
US5148733 *5 Mar 199022 Sep 1992Seymour Duncan CorporationPole piece for an electric string instrument to decrease magnetic flux intensity around strings
US5336845 *29 Oct 19939 Aug 1994Actodyne General, Inc.Pick-up assembly for a stringed musical instrument
US5391831 *4 Jan 199321 Feb 1995Thomas E. DornElectromagnetic musical pickup having U-shaped ferromagnetic core
US5401900 *14 Jan 199328 Mar 1995Actodyne General, Inc.For a stringed musical instrument
US5408043 *30 Dec 199218 Apr 1995Thomas E. DornElectromagnetic musical pickups with central permanent magnets
US5418327 *4 Jan 199323 May 1995Actodyne General, Inc.Mounting assembly
US5422432 *4 Jan 19936 Jun 1995Thomas E. DornElectromagnetic pickup for a plural-string musical instrument incorporating a coil around a multi-laminate ferromagnetic core
US5430246 *4 Jan 19934 Jul 1995Actodyne General, Inc.Dual coil pick-up assembly for a springed musical instrument
US5438157 *14 Jan 19931 Aug 1995Actodyne General, Inc.Acoustic pick-up assembly for a stringed musical instrument
US5464948 *22 Apr 19947 Nov 1995Actodyne General, Inc.Sensor assembly for a stringed musical instrument
US5641932 *19 Jan 199524 Jun 1997Actodyne General, Inc.Sensor assembly for stringed musical instruments
US5684263 *7 Jun 19954 Nov 1997Actodyne General, Inc.Electromagnetic sensor assembly for musical instruments having a magnetic lining
US5780760 *13 Jan 199714 Jul 1998Gibson Guitar Corp.Guitar pickup switching system for three-pickup guitar
US5789691 *20 Aug 19964 Aug 1998Stich; Willi L.Multi-functional coil system for stringed instruments
US5792973 *10 Jan 199711 Aug 1998Gibson Guitar Corp.Pickup for stringed musical instrument
US5811710 *14 Mar 199722 Sep 1998Dimarzio, Inc.Electromagnetic pickup for stringed musical instruments
US6111185 *14 Jan 199929 Aug 2000Actodyne General, Inc.Sensor assembly for stringed musical instruments
US7227076 *15 Jan 20055 Jun 2007Fender Musical Instruments CorporationAdvanced magnetic circuit to improve both the solenoidal and magnetic functions of string instrument pickups with co-linear coil assemblies
US72887136 Jan 200530 Oct 2007Paul Reed Smith Guitars, Limited PartnershipBobbin and pickup for stringed musical instruments
Classifications
U.S. Classification84/728, 984/368
International ClassificationG10H3/18
Cooperative ClassificationG10H3/181, G10H2220/511
European ClassificationG10H3/18B
Legal Events
DateCodeEventDescription
3 Aug 2005ASAssignment
Owner name: SHAWMUT CAPITAL CORPORATION, NORTH CAROLINA
Free format text: THIS IS A CORRECTIVE ASSIGNMENT TO CHANGE THE NATURE OF CONVEYANCE FROM ASSIGNMENT OF ASSIGNOR S INTEREST;ASSIGNOR:BARCLAYS BUSINESS CREDIT, INC.;REEL/FRAME:016835/0072
Effective date: 19950131
15 Mar 2004ASAssignment
Owner name: FLEET CAPITAL CORPORATION, AS AGENT, NORTH CAROLIN
Free format text: AMENDMENT;ASSIGNOR:FLEET CAPITAL CORPORATION;REEL/FRAME:015083/0512
Effective date: 20031217
Owner name: FLEET CAPITAL CORPORATION, AS AGENT 6100 FAIRVIEW
Free format text: AMENDMENT;ASSIGNOR:FLEET CAPITAL CORPORATION /AR;REEL/FRAME:015083/0512
3 Mar 2004ASAssignment
Owner name: SHAWMUT CAPITAL CORPORATION, NORTH CAROLINA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BARCLAYS BUSINESS CREDIT, INC.;REEL/FRAME:015027/0969
Effective date: 19950131
Owner name: SHAWMUT CAPITAL CORPORATION 6060 J. A. JONES DRIVE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BARCLAYS BUSINESS CREDIT, INC. /AR;REEL/FRAME:015027/0969
16 Jan 1991ASAssignment
Owner name: BARCLAYS BUSINESS CREDIT, INC., 6060 ST. ALBANS ST
Free format text: SECURITY INTEREST;ASSIGNOR:GIBSON GUITAR CORP., A CORP. OF DE;REEL/FRAME:005570/0220
Effective date: 19901219
19 Oct 1987ASAssignment
Owner name: PERPETUAL SAVINGS BANK, F.S.B., SUITE 950, 250 WES
Free format text: SECURITY INTEREST;ASSIGNOR:GIBSON GUITAR CORP.,;REEL/FRAME:004800/0770
Effective date: 19870922
Free format text: SECURITY INTEREST;ASSIGNOR:GIBSON GUITAR CORP.,;REEL/FRAME:4800/770
16 May 1986ASAssignment
Owner name: BARCLAYSAMERICAN/BUSINESS CREDIT, INC., SUITE 200,
Free format text: SECURITY INTEREST;ASSIGNOR:GIBSON GUITAR CORP.;REEL/FRAME:004563/0360
Effective date: 19860115
4 Apr 1986ASAssignment
Owner name: GIBSON GUITAR CORP., 1209 ORANGE STREET, WILMINGTO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ECL INDUSTRIES, INC.,;REEL/FRAME:004534/0974
Effective date: 19860115