US2896491A - Magnetic pickup for stringed musical instrument - Google Patents

Magnetic pickup for stringed musical instrument Download PDF

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US2896491A
US2896491A US517171A US51717155A US2896491A US 2896491 A US2896491 A US 2896491A US 517171 A US517171 A US 517171A US 51717155 A US51717155 A US 51717155A US 2896491 A US2896491 A US 2896491A
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coils
pickup
magnetic
coil
stringed musical
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US517171A
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Seth E Lover
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GIBSON Inc
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GIBSON Inc
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H3/00—Instruments in which the tones are generated by electromechanical means
    • G10H3/12—Instruments 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
    • G10H3/14—Instruments 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
    • G10H3/18—Instruments 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
    • G10H3/181—Details of pick-up assemblies

Definitions

  • This invention relates to improvements in magnetic pickup for stringed musical instrument.
  • the principal objects of this invention are:
  • Fig. 1 is a plan view of a stringed musical instrument having metallic strings and having the preferred form of the magnetic pickup mounted thereon.
  • Fig. 2 is an enlarged fragmentary plan view of the pickup shown in Fig. 1 with parts broken away in horizontal cross section.
  • Fig. 3 is an enlarged vertical transverse cross sectional view through the pickup taken along the plane of the line 33 in Fig. 2.
  • Fig. 4 is a fragmentary longitudinal cross sectional view through the pickup taken along the plane of the line 44 in Fig. 3.
  • Fig. 5 is a bottom plan View of the pickup with the case removed.
  • Fig. 6 is a schematic view illustrating the electrical and magnetic circuits in the pickup in association with an external source of interfering magnetic energy.
  • Fig. 7 is a fragmentary vertical cross sectional view through the top panel of a stringed musical instrument with a modified form of pickup mounted therein.
  • Fig. 8 is a plan view of the pickup shown in Fig. 7 with the cover removed and portions broken away in horizontal cross section.
  • Fig. 9 is a top plan view of a second modified form of pickup with portions broken away in horizontal cross section.
  • Fig. 10 is a side elevational view of the pickup shown Patented July 28, 1959 'in Fig. 9 with portions broken away to illustrate the position of the coils.
  • Fig. 11 is a top plan view of a third modified form of the pickup.
  • Fig. 12 is a vertical cross sectional view taken along the plane of the line 1212 in Fig. 11.
  • Fig. 13 is a schematic view illustrating the electrical and magnetic circuits in Figs. 9 to 12
  • Magnetic pickups for stringed musical instruments having steel strings are Well known and heretofore have consisted essentially of a coil wound around a permanent magnet core With a string of the instrument passing in proximity to the ,core so that vibration of the string will vary the magnetic field through the core and induce an electrical current in the coil capable of being amplified and passed through a loud speaker for amplifying the sound of the instrument.
  • Stringed musical instruments and magnetic pickups of this type have been subject to the undesirable creation of hum noises in the amplifier by reasons of electrical devices in proximity to the pickup which create undesired interfering currents in the coil.
  • Fig. 1 of the drawings illustrates a guitar 1 or other stringed musical instrument having metallic strings 2 stretched over a magnetic pickup devicegenerally indicated at 3.
  • the coils of the pickup device are connected to a jack 4 by means of which the pickup can be electrically connected to an amplifier and loud speaker in a well known manner.
  • the pickup 3 includes a case 5 of non-magnetic material having a removable bottom panel 6 with ears 7 projecting from each end thereof.
  • a mounting plate 8 is secured around the case by means of screws 9 and the mounting plate is in turn attached to the body of the instrument by screws 10.
  • the pickup includes an elongated bar 11 of permanent magnetic material. The bar is cushioned on the bottom of the case 5 by a felt strip 12 and is magnetized transversely from side to side rather than longitudinally along its length so that one side of the magnet constitutes a north pole and the other side constitutes a south pole.
  • pole pieces 13 and 13A Positioned at longitudinally spaced intervals along both sides of the magnet 11 are pairs of upright cylindrical soft iron cores forming pole pieces 13 and 13A, there being a pair of pole pieces for each of the strings 2 of the instrument. At their lower ends the pole pieces abut against the side :edges of the magnet 11 and are held in place by the magnetism of the magnet.
  • the pole pieces 13 on one side of the magnet project through an elongated insulating bobbin 14 having a first coil 15 wound therearound in a plane parallel to the magnet and the surface of the instrument.
  • a similar bobbin 14A surrounds the other line of pole pieces and has a coil 15A wound therearound. End flanges 16 on the bobbin are retained in place by engagement with the inside of the case 5 and screws 17 extending through the bottom of the case into the bobbins between the pole pieces.
  • the electrical connection between the coils '15 and 15A is best illustrated in Figs. 5 and 6 Where the outer ends 18 and 18A of the coils are extended for connection to the previously described jack 4 on the body of the instrument.
  • the inner ends 19 of the coils are electrically joined and the coils 15 and 15A are Wound around the magnetic cores formed by the pole pieces 13 and 13A as illustrated.
  • one coil 15 runs around the front of its core 13 from the connected inner ends 19 While the other coil 15A runs around the back of its core 13A.
  • Careful consideration a 9 of Fig. 6 will indicate that both coils extend about their cores or axes in the same direction from the connection 19.
  • the permanent magnet system created by the permanent magnet 11 and pole pieces 13 and 13A establishes north and south poles at the exposed ends of each pair of the pole pieces in proximity to the superimposed metal string 2 of the instrument and opposite poles are accordingly induced in the metallic string. Vibration of the string causes it to move over the ends of the pole pieces creating a variation in the magnetic field through the coils in a well known fashion. Since the pole piece 13 has a north pole at its upper end, variation in the strength of the magnetic field will tend to create a current in the coil 15 in the direction indicated by the arrow 23 in Fig. 6 and concurrent vibration over the pole piece 13A will tend to induce a current in the coil 15A in the direction indicated by the arrow 23A.
  • the currents in the two coils thus are added together to provide a strong signal in response to the vibration of the string 2.
  • the pickup thus filters out or eliminates the hum of unwanted interfering devices and creates a strong electrical impulse from the vibrating string for accurate reproduction of the sound of the instrument.
  • the permanent magnet is formed in the shape of individual pole pieces 24.
  • Three pole pieces A at one end of the pickup are mounted in a single bobbin 25' and have a coil 26 wound therearound.
  • the other three pole pieces B are mounted in a second bobbin and have a coil 26A wound therearound.
  • the coils 26 and 26A are ofiset longitudinally of the strings 2 and overlapped slightly at the adjacent ends of the coils due to their physical size. Overlapping is held to a minimum to reduce pick up or inductance between the two coils.
  • the bobbins of the coils are connected by screws or rivets 27 to a mounting plate 28 and inclosed by a cover 29 through which the pole pieces project.
  • Mounting bracket 30 is connected to the mounting plate 28 for mounting the pickup on the wall of the instrument ll.
  • the coils 26 and 26A are connected to neutralize the effect of external magnetic fields on the pickup. Since each string of the instrument coacts with only one coil 26 of 26A there is no problem of the signal in one coil opposing the signal in the other.
  • the pole pieces are physically and magnetically connected to a bar 32 of magnetizable metal such as soft iron and the bar 32 is provided with oppositely extending core arms 33 and 33A that project through the centers of coils 34 and 34A.
  • the coils 34 and 34A thus lie in planes parallel to the pole pieces 31 While in Figs. 7 and 8 the coils were in planes perpendicular to the pole pieces.
  • Retaining plates 35 4 of magnetizable metal are bolted in contact with the ends of the core arms 33 and project upwardly along the outer sides of the coils to form partial magnetic return paths between the ends of the permanent magnet pole pieces 31.
  • the inner ends of the coils 34 and 34A are electrically connected as at 36 and the coils are wound with respect to their common end to create opposing and neutralizing voltages under the influence of external magnetic fields.
  • Each string of the instrument coacts primarily with only one or the other of the coils 34 or 34A. However, any incidental current induced in both the coils by vibration of any given string is additive in the outer ends 37 of the coils.
  • the modified form of the pickup shown in Figs. 11 and 12 is very similar to the form illustrated in Figs. 9 and 10.
  • a continuous bar magnet 38 magnetized from its upper to its lower edge is employed.
  • The. coils 3.9 and 39A are bolted to opposite sides and opposite ends of the magnet 38 by bolts 40 and retaining plates 41 of soft iron.
  • the bolts engage non-magnetic clamps 42.
  • the bolts 40 and plates 41 create a magnet return circuit through the coils in association with the instrument string 2 so that the efiiciency of the pickup is improved by utilizing more of the available magnetic flux in the permanent magnet.
  • Figs. 9 to 12 The electrical and magnetic circuits employed in Figs. 9 to 12 are illustrated schematically in Fig. 13 with the strings 2 completing the magnetic path from one end of the permanent magnet to the end of the magnetic return structure. Again the coils are wound with respect to their connected ends to neutralize externally induced currents and hum.
  • the coil 33A When viewed from the north pole of magnet 31 the coil 33A is wound clockwise about the magnetic core from the connection between the coils. Viewed from the same pole the coil 33 is wound counter clockwise from the connection between the coils s0 vibration of the string over the north pole of the core system creates additive currents in the coils.
  • the examples of the pickups as shown in Figs. 6,. 8 and 13 have a common feature in that the two coils are wound oppositely from their common connection with respect to an axis or line common to both coils. That is, a line, which may represent an external line of flux from aninterfering device, has one coil: extending in a clockwise direction from the connection with respect. to the flux field or line while the other coil extends in a counter clockwise direction with respect to the same line.
  • the hypothetical common flux line may extend between the physical axes of the two coils and generally parallel therewith while in Fig. 13 the flux line generally coincides with the physical axes of the two coils which are alined.
  • the physical axes of the two coils are parallel so that the external flux field will affect both coils approximately equally as the pickup and its coils are moved with respect to the interfering device.
  • the physical axes of the two coils may vary somewhat from true parallelism and still be approximately equally and oppositely affected by an external magnetic field.
  • the examples illustrated in Figs. 6 and 13 have a. further feature in common in that the magnetic core; or path of permanent magnetism through the two coils has. a pole, which incidentally forms the pole tip associated with the string of the instrument, that is common toeach coil.
  • the two coils are wound or disposed about this magnetic core or path in like directions from the connection between the coils when viewed from this common pole so that variations in the permanent magnetic field through the core induces like additive voltages in the two coils.
  • the north pole of the magnetic core 13, 11, 13A is common to both coils as the core is a single continuous path.
  • the north pole of magnet 31 is common to both coils even though the magnetic core divides into two separate paths.
  • the example shown in Figs. 7 and 8 does not create additive voltages in the coils as there is no common core means through both coils and each string acts only on a single coil.
  • a magnetic pickup for a stringed musical instrument comprising an elongated permanent bar magnet magnetized from side to side, a plurality of pairs of cylindrical pole pieces of magnetizable soft iron material arranged at spaced intervals along said magnet with the pieces of each pair engaging opposite sides of the magnet and projecting thereabove, a first coil wound around all of the pieces on one side of said magnet, a second coil wound around all of the pieces on the other side of the magnet, one end of each coil being electrically connected to the end of the other with the coils extending in a clockwise direction about each group of pole pieces from the connection, means connected to said coils for connecting the other ends of said coils to an amplifier, and a case of non-magnetic material enclosing said magnet, pole pieces and coils, said case being adapted to be secured to a stringed musical instrument with each string of the instrument passing over a different pair of said pole pieces.

Description

S. E. LOVER July 28, 1959 MAGNETIC PICKUP FOR STRINGED MUSICAL INSTRUMENT Filed June 22, 1955 2 Sheets-Sheet 1 G G O O O July 28, 1959 v s. E. LOVER 2,896,491
7 MAGNETIC PICKUP FOR STRINGED MUSICAL INSTRUMENT Filed June 22, 1955 2 Sheets-Sheet 2 T1 .G-J].
5 INVENTOR. il "\"Q'XL 25 j/fi ZO//f Z2515.
United States Patent MAGNETIC PICKUP FOR STRINGED MUSICAL INSTRUMENT Seth E. Lover, Kalamazoo, Mich., assiguor to Gibson, Inc., Kalamazoo, Mich.
Application June 22, 1955, Serial No. 517,171
1 Claim. (Cl. 84-1.15)
This invention relates to improvements in magnetic pickup for stringed musical instrument. The principal objects of this invention are:
First, to provide a magnetic pickup for a stringed musical instrument which is not afiected by adjacent electrical devices and which does not pick up and transmit to the amplifier the hum of such devices.
Second, to provide an electromagnetic pickup for stringed musical instruments with magnetically opposed pickup coilsthat neutralize the effect of currents induced by adjacent electrical devices.
Third, to provide a hum neutralizing magnetic pickup that is efficient in producing electrical vibrations in response to the playing of a stringed instrument.
Fourth, to provide a magnetic pickup that elfectively employs relatively small masses of permanent magnet material and is easily mounted on a stringed musical instrument in proper relation to the strings of the instrument.
Fifth, to provide a magnetic pickup having a metallic magnetic return circuit between a pole of the permanent magnet and a coacting string of a musical instrument to increase the strength of the magnetic field around the string and improve the efficiency of the permanent magnet.
Other objects and advantages of the invention will be apparent from a consideration of the following description and claim. The drawings, of which there are two sheets, illustrate a preferred and several modified forms of magnetic pickups embodying principles of the invention.
Fig. 1 is a plan view of a stringed musical instrument having metallic strings and having the preferred form of the magnetic pickup mounted thereon.
Fig. 2 is an enlarged fragmentary plan view of the pickup shown in Fig. 1 with parts broken away in horizontal cross section.
Fig. 3 is an enlarged vertical transverse cross sectional view through the pickup taken along the plane of the line 33 in Fig. 2.
Fig. 4 is a fragmentary longitudinal cross sectional view through the pickup taken along the plane of the line 44 in Fig. 3.
Fig. 5 is a bottom plan View of the pickup with the case removed.
Fig. 6 is a schematic view illustrating the electrical and magnetic circuits in the pickup in association with an external source of interfering magnetic energy.
Fig. 7 is a fragmentary vertical cross sectional view through the top panel of a stringed musical instrument with a modified form of pickup mounted therein.
Fig. 8 is a plan view of the pickup shown in Fig. 7 with the cover removed and portions broken away in horizontal cross section.
Fig. 9 is a top plan view of a second modified form of pickup with portions broken away in horizontal cross section.
Fig. 10 is a side elevational view of the pickup shown Patented July 28, 1959 'in Fig. 9 with portions broken away to illustrate the position of the coils.
Fig. 11 is a top plan view of a third modified form of the pickup.
Fig. 12 is a vertical cross sectional view taken along the plane of the line 1212 in Fig. 11.
Fig. 13 is a schematic view illustrating the electrical and magnetic circuits in Figs. 9 to 12 Magnetic pickups for stringed musical instruments having steel strings are Well known and heretofore have consisted essentially of a coil wound around a permanent magnet core With a string of the instrument passing in proximity to the ,core so that vibration of the string will vary the magnetic field through the core and induce an electrical current in the coil capable of being amplified and passed through a loud speaker for amplifying the sound of the instrument. Stringed musical instruments and magnetic pickups of this type have been subject to the undesirable creation of hum noises in the amplifier by reasons of electrical devices in proximity to the pickup which create undesired interfering currents in the coil. The present invention eliminates the undesirable hum by neutralizing undesired induced currents in the pickup coil before they can be amplified and reproduced. Fig. 1 of the drawings illustrates a guitar 1 or other stringed musical instrument having metallic strings 2 stretched over a magnetic pickup devicegenerally indicated at 3. The coils of the pickup device are connected to a jack 4 by means of which the pickup can be electrically connected to an amplifier and loud speaker in a well known manner.
As is more clearly illustrated in Figs. 2 to 5 the pickup 3 includes a case 5 of non-magnetic material having a removable bottom panel 6 with ears 7 projecting from each end thereof. A mounting plate 8 is secured around the case by means of screws 9 and the mounting plate is in turn attached to the body of the instrument by screws 10. Within the case 5 the pickup includes an elongated bar 11 of permanent magnetic material. The bar is cushioned on the bottom of the case 5 by a felt strip 12 and is magnetized transversely from side to side rather than longitudinally along its length so that one side of the magnet constitutes a north pole and the other side constitutes a south pole. Positioned at longitudinally spaced intervals along both sides of the magnet 11 are pairs of upright cylindrical soft iron cores forming pole pieces 13 and 13A, there being a pair of pole pieces for each of the strings 2 of the instrument. At their lower ends the pole pieces abut against the side :edges of the magnet 11 and are held in place by the magnetism of the magnet. The pole pieces 13 on one side of the magnet project through an elongated insulating bobbin 14 having a first coil 15 wound therearound in a plane parallel to the magnet and the surface of the instrument. A similar bobbin 14A surrounds the other line of pole pieces and has a coil 15A wound therearound. End flanges 16 on the bobbin are retained in place by engagement with the inside of the case 5 and screws 17 extending through the bottom of the case into the bobbins between the pole pieces. 7
The electrical connection between the coils '15 and 15A is best illustrated in Figs. 5 and 6 Where the outer ends 18 and 18A of the coils are extended for connection to the previously described jack 4 on the body of the instrument. The inner ends 19 of the coils are electrically joined and the coils 15 and 15A are Wound around the magnetic cores formed by the pole pieces 13 and 13A as illustrated. Viewed from one side of both coils, one coil 15 runs around the front of its core 13 from the connected inner ends 19 While the other coil 15A runs around the back of its core 13A. Careful consideration a 9 of Fig. 6 will indicate that both coils extend about their cores or axes in the same direction from the connection 19. By applying the familiar right hand law of magnetism to the coil 15 it will be noted that an external magnetic field such as is indicated at 29 emanating froman electrical device such as the motor 21 will tend by induced voltage to create a current in the coil 15 in the direction of the arrow 22. However, the same magnetic field at the same instant will tend by induced voltage to create an approximately equal and opposite current in the coil 15A as indicated by the arrow 22 A so that the induced currents cancel each other and cannot create a hum in the pickup and its associated amplifier. If the source of the interfering magnetic field is not centered between the coils or if the coils are not of identical construction cancellation of hum will not be complete but will be substantial. It should be noted that the particular winding of the coils illustrated is not critical because cancellation of interfering voltages can be obtained when the direction of winding of one coil is reversed if the inner or upper end of one coil is connected to the outer or lower end of the other coil.
The permanent magnet system created by the permanent magnet 11 and pole pieces 13 and 13A establishes north and south poles at the exposed ends of each pair of the pole pieces in proximity to the superimposed metal string 2 of the instrument and opposite poles are accordingly induced in the metallic string. Vibration of the string causes it to move over the ends of the pole pieces creating a variation in the magnetic field through the coils in a well known fashion. Since the pole piece 13 has a north pole at its upper end, variation in the strength of the magnetic field will tend to create a current in the coil 15 in the direction indicated by the arrow 23 in Fig. 6 and concurrent vibration over the pole piece 13A will tend to induce a current in the coil 15A in the direction indicated by the arrow 23A. The currents in the two coils thus are added together to provide a strong signal in response to the vibration of the string 2. The pickup thus filters out or eliminates the hum of unwanted interfering devices and creates a strong electrical impulse from the vibrating string for accurate reproduction of the sound of the instrument.
In the modified form of pickup shown in Figs. 7 and 8 the permanent magnet is formed in the shape of individual pole pieces 24. Three pole pieces A at one end of the pickup are mounted in a single bobbin 25' and have a coil 26 wound therearound. The other three pole pieces B are mounted in a second bobbin and have a coil 26A wound therearound. The coils 26 and 26A are ofiset longitudinally of the strings 2 and overlapped slightly at the adjacent ends of the coils due to their physical size. Overlapping is held to a minimum to reduce pick up or inductance between the two coils. The bobbins of the coils are connected by screws or rivets 27 to a mounting plate 28 and inclosed by a cover 29 through which the pole pieces project. Mounting bracket 30 is connected to the mounting plate 28 for mounting the pickup on the wall of the instrument ll. As in the preferred form of the pickup just described the coils 26 and 26A are connected to neutralize the effect of external magnetic fields on the pickup. Since each string of the instrument coacts with only one coil 26 of 26A there is no problem of the signal in one coil opposing the signal in the other.
In the modified form of pickup illustrated in Figs. 9
and the pole pieces 31 again form the permanent magnet part of the pickup. The pole pieces are physically and magnetically connected to a bar 32 of magnetizable metal such as soft iron and the bar 32 is provided with oppositely extending core arms 33 and 33A that project through the centers of coils 34 and 34A. The coils 34 and 34A thus lie in planes parallel to the pole pieces 31 While in Figs. 7 and 8 the coils were in planes perpendicular to the pole pieces. Retaining plates 35 4 of magnetizable metal are bolted in contact with the ends of the core arms 33 and project upwardly along the outer sides of the coils to form partial magnetic return paths between the ends of the permanent magnet pole pieces 31. As with the other forms of the invention the inner ends of the coils 34 and 34A are electrically connected as at 36 and the coils are wound with respect to their common end to create opposing and neutralizing voltages under the influence of external magnetic fields. Each string of the instrument coacts primarily with only one or the other of the coils 34 or 34A. However, any incidental current induced in both the coils by vibration of any given string is additive in the outer ends 37 of the coils.
The modified form of the pickup shown in Figs. 11 and 12 is very similar to the form illustrated in Figs. 9 and 10. In place of individual pole pieces as permanent magnets, a continuous bar magnet 38 magnetized from its upper to its lower edge is employed. The. coils 3.9 and 39A are bolted to opposite sides and opposite ends of the magnet 38 by bolts 40 and retaining plates 41 of soft iron. The bolts engage non-magnetic clamps 42. The bolts 40 and plates 41 create a magnet return circuit through the coils in association with the instrument string 2 so that the efiiciency of the pickup is improved by utilizing more of the available magnetic flux in the permanent magnet.
The electrical and magnetic circuits employed in Figs. 9 to 12 are illustrated schematically in Fig. 13 with the strings 2 completing the magnetic path from one end of the permanent magnet to the end of the magnetic return structure. Again the coils are wound with respect to their connected ends to neutralize externally induced currents and hum. When viewed from the north pole of magnet 31 the coil 33A is wound clockwise about the magnetic core from the connection between the coils. Viewed from the same pole the coil 33 is wound counter clockwise from the connection between the coils s0 vibration of the string over the north pole of the core system creates additive currents in the coils. Considering both coils in series in a single external circuit and viewed from one end of the common axis through the coils, the wire winds or extends first in one direction about the axis to the connection between the coils and. then reverses and winds the other way through the second coil to the other external lead. Thus an external magnetic field common to both coils induces opposing voltages in the two coils and the net external voltage-due to the field is nil.
The examples of the pickups as shown in Figs. 6,. 8 and 13 have a common feature in that the two coils are wound oppositely from their common connection with respect to an axis or line common to both coils. That is, a line, which may represent an external line of flux from aninterfering device, has one coil: extending in a clockwise direction from the connection with respect. to the flux field or line while the other coil extends in a counter clockwise direction with respect to the same line. In Figs. 6 and 8 the hypothetical common flux line may extend between the physical axes of the two coils and generally parallel therewith while in Fig. 13 the flux line generally coincides with the physical axes of the two coils which are alined. For best results the physical axes of the two coils are parallel so that the external flux field will affect both coils approximately equally as the pickup and its coils are moved with respect to the interfering device. However, the physical axes of the two coils may vary somewhat from true parallelism and still be approximately equally and oppositely affected by an external magnetic field.
The examples illustrated in Figs. 6 and 13 have a. further feature in common in that the magnetic core; or path of permanent magnetism through the two coils has. a pole, which incidentally forms the pole tip associated with the string of the instrument, that is common toeach coil. The two coils are wound or disposed about this magnetic core or path in like directions from the connection between the coils when viewed from this common pole so that variations in the permanent magnetic field through the core induces like additive voltages in the two coils. In Fig. 6 the north pole of the magnetic core 13, 11, 13A is common to both coils as the core is a single continuous path. In Fig. 13 the north pole of magnet 31 is common to both coils even though the magnetic core divides into two separate paths. The example shown in Figs. 7 and 8 does not create additive voltages in the coils as there is no common core means through both coils and each string acts only on a single coil.
Having thus described my invention what I claim as new and desire to secure by Letters Patent is:
A magnetic pickup for a stringed musical instrument comprising an elongated permanent bar magnet magnetized from side to side, a plurality of pairs of cylindrical pole pieces of magnetizable soft iron material arranged at spaced intervals along said magnet with the pieces of each pair engaging opposite sides of the magnet and projecting thereabove, a first coil wound around all of the pieces on one side of said magnet, a second coil wound around all of the pieces on the other side of the magnet, one end of each coil being electrically connected to the end of the other with the coils extending in a clockwise direction about each group of pole pieces from the connection, means connected to said coils for connecting the other ends of said coils to an amplifier, and a case of non-magnetic material enclosing said magnet, pole pieces and coils, said case being adapted to be secured to a stringed musical instrument with each string of the instrument passing over a different pair of said pole pieces.
References Cited in the file of this patent UNITED STATES PATENTS
US517171A 1955-06-22 1955-06-22 Magnetic pickup for stringed musical instrument Expired - Lifetime US2896491A (en)

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Cited By (70)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3147332A (en) * 1961-08-21 1964-09-01 Clarence L Fender Electric guitar incorporating pickup means adapted to minimize beating effects
US3177283A (en) * 1961-08-21 1965-04-06 Clarence L Fender Electric guitar incorporating separate pickups for the wound and unwound strings
US3236930A (en) * 1962-05-11 1966-02-22 Columbia Records Distrib Corp Electromagnetic pickup for electrical musical instruments
US3237502A (en) * 1964-05-11 1966-03-01 Semie A Moseley Stringed musical instrument
US3657461A (en) * 1970-12-21 1972-04-18 Quilla H Freeman Single pickup frequency control for stringed instrument
US3742113A (en) * 1971-04-28 1973-06-26 M Cohen Stringed musical instrument with electrical feedback
US3902394A (en) * 1974-08-05 1975-09-02 Norlin Music Inc Electrical pickup for a stringed musical instrument
US3962946A (en) * 1975-03-10 1976-06-15 Ovation Instruments, Inc. Magnetic induction stringed instrument pickup
US3983777A (en) * 1975-02-28 1976-10-05 William Bartolini Single face, high asymmetry variable reluctance pickup for steel string musical instruments
US4026178A (en) * 1975-04-11 1977-05-31 Norlin Music, Inc. Magnetic pickup for stringed musical instrument
US4143575A (en) * 1976-10-01 1979-03-13 Oliver Richard C Electronic sound generating system for a stringed musical instrument
US4188849A (en) * 1977-01-19 1980-02-19 Ovation Instruments, Inc. Pickup for stringed musical instrument
US4220069A (en) * 1979-06-20 1980-09-02 Fender C Leo Electromagnetic pickup for stringed musical instruments
US4222301A (en) * 1978-01-17 1980-09-16 Valdez Arthur F Magnetic pickup arrangement for stringed musical instrument
US4261240A (en) * 1979-11-08 1981-04-14 Aaroe Kenneth T Oscillating electromagnetic transducer for generating tremolo
FR2506109A1 (en) * 1981-05-18 1982-11-19 Berton Vincent Microphone for electric guitar - has reduced winding on axis parallel to strings under which magnetic flux guides extend
WO1982004156A1 (en) * 1981-05-18 1982-11-25 Vincent Berton Microphones for electric guitares
US4501185A (en) * 1983-07-29 1985-02-26 Dimarzio Musical Instrument Pickups Transducer for stringer musical instrument
US4809578A (en) * 1987-07-14 1989-03-07 Lace Jr Donald A Magnetic field shaping in an acoustic pick-up assembly
US4941388A (en) * 1989-05-12 1990-07-17 Hoover Alan A String vibration sustaining device
US5290968A (en) * 1992-04-17 1994-03-01 Frank Mirigliano Magnetic pickup for musical instruments
US5336845A (en) * 1993-01-04 1994-08-09 Actodyne General, Inc. Pick-up assembly for a stringed musical instrument
US5376754A (en) * 1993-01-12 1994-12-27 Gibson Guitar Corp. Pickup apparatus, having a winding with an adjacent closed circuit, for stringed musical instruments
US5391831A (en) * 1990-10-10 1995-02-21 Thomas E. Dorn Electromagnetic musical pickup having U-shaped ferromagnetic core
US5399802A (en) * 1991-03-28 1995-03-21 Dimarzio Musical Instrument Pickups, Inc. Electromagnetic pickup for stringed musical instruments
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
US5530199A (en) * 1995-08-22 1996-06-25 Dimarzio Inc. Electromagnetic pickup for stringed musical instruments
US5641932A (en) * 1995-01-19 1997-06-24 Actodyne General, Inc. Sensor assembly for stringed musical instruments
US5811710A (en) * 1997-03-14 1998-09-22 Dimarzio, Inc. Electromagnetic pickup for stringed musical instruments
US5908998A (en) * 1997-02-27 1999-06-01 Dimarzio, Inc. High inductance electromagnetic pickup for stringed musical instruments
US5932827A (en) * 1995-01-09 1999-08-03 Osborne; Gary T. Sustainer for a musical instrument
WO2001045463A1 (en) * 1999-12-14 2001-06-21 Peter Gustafsson Electromagnetic microphone for string instruments
US6476309B2 (en) 2000-12-14 2002-11-05 Giovanni Gaglio Magnetic pick-up device for stringed musical instrument
US6525258B1 (en) 2002-03-08 2003-02-25 Peavey Electronics Corporation Electromechanical musical instrument pickup
US20040003709A1 (en) * 1999-01-19 2004-01-08 Kinman Christopher Ian Noise sensing bobbin-coil assembly for amplified stringed musical instrument pickups
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
DE102006013001A1 (en) * 2006-03-22 2007-10-04 Peter Bell Electromagnetic pick-up for e.g. electric guitar, has winding divided into multiple winding sections and wound with two wires to provide connecting lead at connection point of wires, where two sections are of same size
US7514626B1 (en) 2007-12-14 2009-04-07 John Jerome Snyder Method and apparatus for electrostatic pickup for stringed musical instruments
US20090255397A1 (en) * 2008-04-10 2009-10-15 Collin Mulvany Passive electromagnetic string isolating pickup
US7612282B1 (en) 2007-04-16 2009-11-03 Andrew Scott Lawing Musical instrument pickup
US20100122623A1 (en) * 2008-10-17 2010-05-20 Salo Jarno Johannes Electromagnetic pickup for stringed musical instrument, and an electric guitar
US20100269671A1 (en) * 2009-04-22 2010-10-28 Randazzo Teddy C Triangular Mode Guitar Pickup
US7989690B1 (en) 2007-04-16 2011-08-02 Andrew Scott Lawing Musical instrument pickup systems
US20110188680A1 (en) * 2010-01-29 2011-08-04 Kabushiki Kaisha Audio-Technica Ribbon microphone
US20110311069A1 (en) * 2008-07-23 2011-12-22 Sonion Nederland Bv Receiver assembly for an inflatable ear device
US8415551B1 (en) 2009-11-05 2013-04-09 George J. Dixon Composite pole piece musical instrument pickup
US8664507B1 (en) 2010-09-01 2014-03-04 Andrew Scott Lawing Musical instrument pickup and methods
US8853517B1 (en) 2010-11-05 2014-10-07 George J. Dixon Musical instrument pickup incorporating engineered ferromagnetic materials
US8907199B1 (en) 2010-11-05 2014-12-09 George J. Dixon Musical instrument pickup with hard ferromagnetic backplate
US8969701B1 (en) 2013-03-14 2015-03-03 George J. Dixon Musical instrument pickup with field modifier
CN104424938A (en) * 2013-08-26 2015-03-18 张学民 Double-row single-coil double-pickup unit
US8993868B2 (en) 2013-03-11 2015-03-31 Anastasios Nikolas Angelopoulos Universal pickup
US20150379978A1 (en) * 2014-06-26 2015-12-31 Changsoo Jang Electromagnetic Pickup for Stringed Instruments
US9589553B2 (en) 2013-04-11 2017-03-07 David John ULBRICK Noise reduction device
US9601100B1 (en) * 2015-03-09 2017-03-21 George J. Dixon Magnetic pickup with external tone shaper
US9837063B1 (en) 2016-01-21 2017-12-05 Michael David Feese Pickup coil sensors and methods for adjusting frequency response characteristics of pickup coil sensors
USD817385S1 (en) 2016-10-12 2018-05-08 Fender Musical Instruments Corporation Humbucking pickup
US10020781B2 (en) 2016-01-20 2018-07-10 Steven M. Fryette Noise cancellation in amplifier systems
US10115383B2 (en) 2016-10-12 2018-10-30 Fender Musical Instruments Corporation Humbucking pickup and method of providing permanent magnet extending through opposing coils parallel to string orientation
US10163431B2 (en) * 2017-05-03 2018-12-25 Christopher Mills Non-linear pickup for string instruments
US10217450B2 (en) 2017-06-07 2019-02-26 Donald L Baker Humbucking switching arrangements and methods for stringed instrument pickups
US10380986B2 (en) 2014-07-23 2019-08-13 Donald L Baker Means and methods for switching odd and even numbers of matched pickups to produce all humbucking tones
US11017940B2 (en) 2018-05-30 2021-05-25 Commissariat A L'energie Atomique Et Aux Energies Alternatives Integrated circuit comprising a variable inductor
US11087731B2 (en) 2014-07-23 2021-08-10 Donald L Baker Humbucking pair building block circuit for vibrational sensors

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DE817992C (en) * 1949-09-27 1951-10-22 Conrad Reitzig Method for the optional amplification or weakening of the volume reproduction of strings in musical instruments which are played in connection with electromagnetic pickups
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US2262335A (en) * 1939-07-21 1941-11-11 Clarence W Russell Musical instrument
US2581653A (en) * 1947-11-10 1952-01-08 Grimshaw Emile Electrical pickup for string instruments
US2542271A (en) * 1948-07-24 1951-02-20 Maria De Reitzes Marienwert Device for creating oscillations
DE817992C (en) * 1949-09-27 1951-10-22 Conrad Reitzig Method for the optional amplification or weakening of the volume reproduction of strings in musical instruments which are played in connection with electromagnetic pickups
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Cited By (84)

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US3147332A (en) * 1961-08-21 1964-09-01 Clarence L Fender Electric guitar incorporating pickup means adapted to minimize beating effects
US3177283A (en) * 1961-08-21 1965-04-06 Clarence L Fender Electric guitar incorporating separate pickups for the wound and unwound strings
US3236930A (en) * 1962-05-11 1966-02-22 Columbia Records Distrib Corp Electromagnetic pickup for electrical musical instruments
US3237502A (en) * 1964-05-11 1966-03-01 Semie A Moseley Stringed musical instrument
US3657461A (en) * 1970-12-21 1972-04-18 Quilla H Freeman Single pickup frequency control for stringed instrument
US3742113A (en) * 1971-04-28 1973-06-26 M Cohen Stringed musical instrument with electrical feedback
US3902394A (en) * 1974-08-05 1975-09-02 Norlin Music Inc Electrical pickup for a stringed musical instrument
US3983777A (en) * 1975-02-28 1976-10-05 William Bartolini Single face, high asymmetry variable reluctance pickup for steel string musical instruments
US3962946A (en) * 1975-03-10 1976-06-15 Ovation Instruments, Inc. Magnetic induction stringed instrument pickup
US4026178A (en) * 1975-04-11 1977-05-31 Norlin Music, Inc. Magnetic pickup for stringed musical instrument
US4143575A (en) * 1976-10-01 1979-03-13 Oliver Richard C Electronic sound generating system for a stringed musical instrument
US4188849A (en) * 1977-01-19 1980-02-19 Ovation Instruments, Inc. Pickup for stringed musical instrument
US4222301A (en) * 1978-01-17 1980-09-16 Valdez Arthur F Magnetic pickup arrangement for stringed musical instrument
US4220069A (en) * 1979-06-20 1980-09-02 Fender C Leo Electromagnetic pickup for stringed musical instruments
US4261240A (en) * 1979-11-08 1981-04-14 Aaroe Kenneth T Oscillating electromagnetic transducer for generating tremolo
FR2506109A1 (en) * 1981-05-18 1982-11-19 Berton Vincent Microphone for electric guitar - has reduced winding on axis parallel to strings under which magnetic flux guides extend
WO1982004156A1 (en) * 1981-05-18 1982-11-25 Vincent Berton Microphones for electric guitares
US4501185A (en) * 1983-07-29 1985-02-26 Dimarzio Musical Instrument Pickups Transducer for stringer musical instrument
WO1990010287A1 (en) * 1987-07-14 1990-09-07 Lace Donald A A pickup device for stringed instruments
US4809578A (en) * 1987-07-14 1989-03-07 Lace Jr Donald A Magnetic field shaping in an acoustic pick-up assembly
US4941388A (en) * 1989-05-12 1990-07-17 Hoover Alan A String vibration sustaining device
US5391831A (en) * 1990-10-10 1995-02-21 Thomas E. Dorn Electromagnetic musical pickup having U-shaped ferromagnetic core
US5408043A (en) * 1990-10-10 1995-04-18 Thomas E. Dorn Electromagnetic musical pickups with central permanent magnets
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
US5399802A (en) * 1991-03-28 1995-03-21 Dimarzio Musical Instrument Pickups, Inc. Electromagnetic pickup for stringed musical instruments
US5290968A (en) * 1992-04-17 1994-03-01 Frank Mirigliano Magnetic pickup for musical instruments
US5430246A (en) * 1993-01-04 1995-07-04 Actodyne General, Inc. Dual coil pick-up assembly for a springed musical instrument
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
US5376754A (en) * 1993-01-12 1994-12-27 Gibson Guitar Corp. Pickup apparatus, having a winding with an adjacent closed circuit, for stringed musical instruments
US5438157A (en) * 1993-01-14 1995-08-01 Actodyne General, Inc. Acoustic pick-up assembly for a stringed musical instrument
US5401900A (en) * 1993-01-14 1995-03-28 Actodyne General, Inc. Mounting assembly for an acoustic pick-up
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
US5932827A (en) * 1995-01-09 1999-08-03 Osborne; Gary T. Sustainer for a musical instrument
US5641932A (en) * 1995-01-19 1997-06-24 Actodyne General, Inc. Sensor assembly for stringed musical instruments
US5530199A (en) * 1995-08-22 1996-06-25 Dimarzio Inc. Electromagnetic pickup for stringed musical instruments
US5908998A (en) * 1997-02-27 1999-06-01 Dimarzio, Inc. High inductance electromagnetic pickup for stringed musical instruments
US5811710A (en) * 1997-03-14 1998-09-22 Dimarzio, Inc. Electromagnetic pickup for stringed musical instruments
US7189916B2 (en) 1999-01-19 2007-03-13 Christopher Ian Kinman Noise sensing bobbin-coil assembly for amplified stringed musical instrument pickups
US20060112816A1 (en) * 1999-01-19 2006-06-01 Kinman Christopher I Noise sensing bobbin-coil assembly for amplified stringed musical instrument pickups
US7022909B2 (en) 1999-01-19 2006-04-04 Christopher Ian Kinman Noise sensing bobbin-coil assembly for amplified stringed musical instrument pickups
US20040003709A1 (en) * 1999-01-19 2004-01-08 Kinman Christopher Ian Noise sensing bobbin-coil assembly for amplified stringed musical instrument pickups
US20030051596A1 (en) * 1999-12-14 2003-03-20 Peter Gustafsson Electromagnetic microphone for string instruments
WO2001045463A1 (en) * 1999-12-14 2001-06-21 Peter Gustafsson Electromagnetic microphone for string instruments
US6476309B2 (en) 2000-12-14 2002-11-05 Giovanni Gaglio Magnetic pick-up device for stringed musical instrument
US6525258B1 (en) 2002-03-08 2003-02-25 Peavey Electronics Corporation Electromechanical musical instrument pickup
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
US7288713B2 (en) 2004-01-14 2007-10-30 Paul Reed Smith Guitars, Limited Partnership Bobbin and pickup 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
DE102006013001A1 (en) * 2006-03-22 2007-10-04 Peter Bell Electromagnetic pick-up for e.g. electric guitar, has winding divided into multiple winding sections and wound with two wires to provide connecting lead at connection point of wires, where two sections are of same size
US7612282B1 (en) 2007-04-16 2009-11-03 Andrew Scott Lawing Musical instrument pickup
US7989690B1 (en) 2007-04-16 2011-08-02 Andrew Scott Lawing Musical instrument pickup systems
US7514626B1 (en) 2007-12-14 2009-04-07 John Jerome Snyder Method and apparatus for electrostatic pickup for stringed musical instruments
US20090255397A1 (en) * 2008-04-10 2009-10-15 Collin Mulvany Passive electromagnetic string isolating pickup
US7982123B2 (en) * 2008-04-10 2011-07-19 Collin Mulvany Passive electromagnetic string isolating pickup
US20110311069A1 (en) * 2008-07-23 2011-12-22 Sonion Nederland Bv Receiver assembly for an inflatable ear device
US8526652B2 (en) * 2008-07-23 2013-09-03 Sonion Nederland Bv Receiver assembly for an inflatable ear device
US20100122623A1 (en) * 2008-10-17 2010-05-20 Salo Jarno Johannes Electromagnetic pickup for stringed musical instrument, and an electric guitar
US7994413B2 (en) 2008-10-17 2011-08-09 Salo Jarno Johannes Electromagnetic pickup for stringed musical instrument, and an electric guitar
US8088988B2 (en) * 2009-04-22 2012-01-03 Randazzo Teddy C Triangular mode guitar pickup
US20100269671A1 (en) * 2009-04-22 2010-10-28 Randazzo Teddy C Triangular Mode Guitar Pickup
US8415551B1 (en) 2009-11-05 2013-04-09 George J. Dixon Composite pole piece musical instrument pickup
US20110188680A1 (en) * 2010-01-29 2011-08-04 Kabushiki Kaisha Audio-Technica Ribbon microphone
US8442243B2 (en) * 2010-01-29 2013-05-14 Kabushiki Kaisha Audio-Technica Ribbon microphone
US8664507B1 (en) 2010-09-01 2014-03-04 Andrew Scott Lawing Musical instrument pickup and methods
US8853517B1 (en) 2010-11-05 2014-10-07 George J. Dixon Musical instrument pickup incorporating engineered ferromagnetic materials
US8907199B1 (en) 2010-11-05 2014-12-09 George J. Dixon Musical instrument pickup with hard ferromagnetic backplate
US8993868B2 (en) 2013-03-11 2015-03-31 Anastasios Nikolas Angelopoulos Universal pickup
US8969701B1 (en) 2013-03-14 2015-03-03 George J. Dixon Musical instrument pickup with field modifier
US9589553B2 (en) 2013-04-11 2017-03-07 David John ULBRICK Noise reduction device
CN104424938A (en) * 2013-08-26 2015-03-18 张学民 Double-row single-coil double-pickup unit
US20150379978A1 (en) * 2014-06-26 2015-12-31 Changsoo Jang Electromagnetic Pickup for Stringed Instruments
US9552802B2 (en) * 2014-06-26 2017-01-24 Changsoo Jang Electromagnetic pickup for stringed instruments
US10380986B2 (en) 2014-07-23 2019-08-13 Donald L Baker Means and methods for switching odd and even numbers of matched pickups to produce all humbucking tones
US11087731B2 (en) 2014-07-23 2021-08-10 Donald L Baker Humbucking pair building block circuit for vibrational sensors
US9601100B1 (en) * 2015-03-09 2017-03-21 George J. Dixon Magnetic pickup with external tone shaper
US10020781B2 (en) 2016-01-20 2018-07-10 Steven M. Fryette Noise cancellation in amplifier systems
US9837063B1 (en) 2016-01-21 2017-12-05 Michael David Feese Pickup coil sensors and methods for adjusting frequency response characteristics of pickup coil sensors
USD817385S1 (en) 2016-10-12 2018-05-08 Fender Musical Instruments Corporation Humbucking pickup
US10115383B2 (en) 2016-10-12 2018-10-30 Fender Musical Instruments Corporation Humbucking pickup and method of providing permanent magnet extending through opposing coils parallel to string orientation
US10163431B2 (en) * 2017-05-03 2018-12-25 Christopher Mills Non-linear pickup for string instruments
US10217450B2 (en) 2017-06-07 2019-02-26 Donald L Baker Humbucking switching arrangements and methods for stringed instrument pickups
US11017940B2 (en) 2018-05-30 2021-05-25 Commissariat A L'energie Atomique Et Aux Energies Alternatives Integrated circuit comprising a variable inductor

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