|Publication number||US3902394 A|
|Publication date||Sep 2, 1975|
|Filing date||Aug 5, 1974|
|Priority date||Aug 5, 1974|
|Publication number||US 3902394 A, US 3902394A, US-A-3902394, US3902394 A, US3902394A|
|Inventors||Willi Lorenz Stich|
|Original Assignee||Norlin Music Inc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (12), Referenced by (27), Classifications (6), Legal Events (7)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent Stich 14 1 Sept. 2, 1975  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
 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  Int. Cl. GlOH 3/08 Attorney, A ent, or FirmHill, Gross, Simpson, Van  Field Of Search 84/1.141.16; Santen Steadman Chiara & Simpson  References Cited  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.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2263973 *||Apr 26, 1941||Nov 25, 1941||O'brien Daniel P||Musical instrument|
|US2896491 *||Jun 22, 1955||Jul 28, 1959||Gibson Inc||Magnetic pickup for stringed musical instrument|
|US3236930 *||May 11, 1962||Feb 22, 1966||Columbia Records Distrib Corp||Electromagnetic pickup for electrical musical instruments|
|US3249677 *||Oct 19, 1962||May 3, 1966||Ormston Burns Ltd||Pick-ups for guitars and coupling circuits therefor|
|US3483303 *||Jul 29, 1965||Dec 9, 1969||Warner Lorenzo A||Elongated pickup for metal stringed musical instruments having ferromagnetic shielding|
|US3535968 *||Apr 14, 1969||Oct 27, 1970||Kaman Corp||Adjustable electromagnetic pick-up for stringed musical instruments|
|US3571483 *||Feb 2, 1970||Mar 16, 1971||Hammond Corp||Variable reluctance guitar pickup system|
|US3588311 *||Jan 16, 1969||Jun 28, 1971||Zoller Attila C||Bi-directional electromagnetic pick-up device for stringed musical instruments|
|US3657461 *||Dec 21, 1970||Apr 18, 1972||Freeman Quilla H||Single pickup frequency control for stringed instrument|
|US3668295 *||Mar 31, 1971||Jun 6, 1972||Broussard Paul Daniel||Electromagnetic audio pickup for stringed musical instruments, with volume control means, and suitable for use with any type strings|
|US3711619 *||Nov 4, 1970||Jan 16, 1973||Jones R||Natural performance extended range pick-up device|
|US3715446 *||Jun 22, 1971||Feb 6, 1973||Gulf & Western Industries||Magnetic pickup for stringed musical instruments|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US4212220 *||Oct 21, 1977||Jul 15, 1980||Helpinstill Charles T||Magnetic sensor for a musical instrument and method of constructing same|
|US4269103 *||Jun 30, 1977||May 26, 1981||Underwood John F||Electromagnetic pickup for stringed musical instruments|
|US4364295 *||Mar 2, 1981||Dec 21, 1982||Stich Willi L||Musical instrument sound pickup and method of assembly thereof|
|US4442749 *||Aug 6, 1982||Apr 17, 1984||Dimarzio Musical Instrument Pickups, Inc.||Electrical pickup for a stringed instrument having ferromagnetic strings|
|US4878412 *||Jan 9, 1989||Nov 7, 1989||Resnick Martin H||Electromagnetic pickup for a stringed musical instrument having ferromagnetic strings and method|
|US5148733 *||Mar 5, 1990||Sep 22, 1992||Seymour Duncan Corporation||Pole piece for an electric string instrument to decrease magnetic flux intensity around strings|
|US5336845 *||Oct 29, 1993||Aug 9, 1994||Actodyne General, Inc.||Pick-up assembly for a stringed musical instrument|
|US5391831 *||Jan 4, 1993||Feb 21, 1995||Thomas E. Dorn||Electromagnetic musical pickup having U-shaped ferromagnetic core|
|US5401900 *||Jan 14, 1993||Mar 28, 1995||Actodyne General, Inc.||Mounting assembly for an acoustic pick-up|
|US5408043 *||Dec 30, 1992||Apr 18, 1995||Thomas E. Dorn||Electromagnetic musical pickups with central permanent magnets|
|US5418327 *||Jan 4, 1993||May 23, 1995||Actodyne General, Inc.||Mounting assembly|
|US5422432 *||Jan 4, 1993||Jun 6, 1995||Thomas E. Dorn||Electromagnetic pickup for a plural-string musical instrument incorporating a coil around a multi-laminate ferromagnetic core|
|US5430246 *||Jan 4, 1993||Jul 4, 1995||Actodyne General, Inc.||Dual coil pick-up assembly for a springed musical instrument|
|US5438157 *||Jan 14, 1993||Aug 1, 1995||Actodyne General, Inc.||Acoustic pick-up assembly for a stringed musical instrument|
|US5464948 *||Apr 22, 1994||Nov 7, 1995||Actodyne General, Inc.||Sensor assembly for a stringed musical instrument|
|US5641932 *||Jan 19, 1995||Jun 24, 1997||Actodyne General, Inc.||Sensor assembly for stringed musical instruments|
|US5684263 *||Jun 7, 1995||Nov 4, 1997||Actodyne General, Inc.||Electromagnetic sensor assembly for musical instruments having a magnetic lining|
|US5780760 *||Jan 13, 1997||Jul 14, 1998||Gibson Guitar Corp.||Guitar pickup switching system for three-pickup guitar|
|US5789691 *||Aug 20, 1996||Aug 4, 1998||Stich; Willi L.||Multi-functional coil system for stringed instruments|
|US5792973 *||Jan 10, 1997||Aug 11, 1998||Gibson Guitar Corp.||Pickup for stringed musical instrument|
|US5811710 *||Mar 14, 1997||Sep 22, 1998||Dimarzio, Inc.||Electromagnetic pickup for stringed musical instruments|
|US6111185 *||Jan 14, 1999||Aug 29, 2000||Actodyne General, Inc.||Sensor assembly for stringed musical instruments|
|US7227076 *||Jan 15, 2005||Jun 5, 2007||Fender Musical Instruments Corporation||Advanced magnetic circuit to improve both the solenoidal and magnetic functions of string instrument pickups with co-linear coil assemblies|
|US7288713||Jan 6, 2005||Oct 30, 2007||Paul Reed Smith Guitars, Limited Partnership||Bobbin and pickup for stringed musical instruments|
|US20050150364 *||Jan 12, 2004||Jul 14, 2005||Paul Reed Smith Guitars, Limited Partnership||Multi-mode multi-coil pickup and pickup system for stringed musical instruments|
|US20050150365 *||Jan 6, 2005||Jul 14, 2005||Paul Reed Smith Guitars, Limited Partnership||Bobbin and pickup for stringed musical instruments|
|US20060156911 *||Jan 15, 2005||Jul 20, 2006||Stich Willi L||Advanced magnetic circuit to improve both the solenoidal and magnetic functions of string instrument pickups with co-linear coil assemblies|
|U.S. Classification||84/728, 984/368|
|Cooperative Classification||G10H3/181, G10H2220/511|
|Aug 3, 2005||AS||Assignment|
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
|Mar 15, 2004||AS||Assignment|
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
|Mar 3, 2004||AS||Assignment|
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
|Jan 16, 1991||AS||Assignment|
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
|Oct 19, 1987||AS||Assignment|
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
|May 16, 1986||AS||Assignment|
Owner name: BARCLAYSAMERICAN/BUSINESS CREDIT, INC., SUITE 200,
Free format text: SECURITY INTEREST;ASSIGNOR:GIBSON GUITAR CORP.;REEL/FRAME:004563/0360
Effective date: 19860115
|Apr 4, 1986||AS||Assignment|
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