EP0248528A2 - Abnehmer für Saiteninstrumente - Google Patents

Abnehmer für Saiteninstrumente Download PDF

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Publication number
EP0248528A2
EP0248528A2 EP87303858A EP87303858A EP0248528A2 EP 0248528 A2 EP0248528 A2 EP 0248528A2 EP 87303858 A EP87303858 A EP 87303858A EP 87303858 A EP87303858 A EP 87303858A EP 0248528 A2 EP0248528 A2 EP 0248528A2
Authority
EP
European Patent Office
Prior art keywords
sheet
cable
pick
electrode
screen layer
Prior art date
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.)
Withdrawn
Application number
EP87303858A
Other languages
English (en)
French (fr)
Other versions
EP0248528A3 (de
Inventor
John Scott Strachan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pennwalt Piezo Film Ltd
Original Assignee
Pennwalt Piezo Film Ltd
Syrinx Innovations Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pennwalt Piezo Film Ltd, Syrinx Innovations Ltd filed Critical Pennwalt Piezo Film Ltd
Publication of EP0248528A2 publication Critical patent/EP0248528A2/de
Publication of EP0248528A3 publication Critical patent/EP0248528A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • G10H3/146—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 membrane, e.g. a drum; Pick-up means for vibrating surfaces, e.g. housing of an instrument
    • 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
    • G10H2220/00—Input/output interfacing specifically adapted for electrophonic musical tools or instruments
    • G10H2220/461—Transducers, 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
    • G10H2220/525—Piezoelectric transducers for vibration sensing or vibration excitation in the audio range; Piezoelectric strain sensing, e.g. as key velocity sensor; Piezoelectric actuators, e.g. key actuation in response to a control voltage

Definitions

  • This invention relates to pick-ups for generating electrical signals from stringed instruments with bodies acting as resonant sounding boards, such as guitars, mandolins and violins.
  • a principal object of the present invention is to provide a pick-up which is well screened from electromagnetic interference while providing a good level of output signal.
  • the invention also seeks to provide an improved connecting cable arrangement.
  • the invention accordingly provides a pick-up device for an instrument of the kind stated above, comprising an elongate sheet of a polymeric piezoelectric material, a metallised electrode formed on one face of said sheet and extending along not more than one-half the length thereof, and a metallised screen layer formed on the other face of said sheet and extending for substantially the whole length thereof, the sheet being folded over with the screen layer to the outside.
  • the pick-up comprises an assembly 10 the face of which visible in Fig. 1 is secured to the front panel of an acoustic guitar or other suitable instrument, suitably by double-sided self adhesive tape.
  • the assembly 10 is connected by a cable 12 to a kach socket 14 forming part-of a connector assembly 16.
  • the connector assembly 16 comprises an integral-moulding of a resilient material, such as synthetic rubber, forming spaced blocks 18, 20 and a connecting web 22.
  • the connecting web 22 is apertured at 24 in a manner suitable to allow the assembly 16 to be mounted on the bottom strap button of the guitar.
  • the block 18 has a bore through which the cable 12 is threaded, the cable 12 being secured therein by epoxy adhesive. The cable 12 then passes in a loop to the jack socket 14 which is glued in a suitable cavity in the block 20.
  • This arrangement allows a lightweight cable of short length to be used between the pick-up transducer and the bottom of the guitar.
  • Such cable may have relatively poor screening ability, but since only a short length is used this is not critical.
  • a relatively heavy, well-screened cable (not shown) may then be used between the socket 14 and the amplifier, but with the arrangement described this does not impose a mechanical load on the pick-up, nor does it contact the guitar body.
  • the assembly 10 comprises a piezoelectric polymeric ribbon, generally designated at 26, within a cover 28, and an end cap 30.
  • the ribbon 26 comprises a sheet 32 of polyvinylidene fluoride (PVDF) on one side of which an electrode 34 with connecting tab 34a is formed by printing with silver ink.
  • PVDF polyvinylidene fluoride
  • a screen layer 36 with connecting tab 36a is likewise formed by printing with silver ink.
  • the electrode 34 extends to a position short of the mid-length M-M of the sheet 32, and that the screen 36 is wider than the electrode 34.
  • the sheet 32 is folded about the mid-line M-M to the condition shown in Fig. 3 with the electrode 34 to the inside.
  • the electrode 34 is thus entirely enclosed within the screen 36.
  • the central conductor 38 of the cable 12 is then soldered to the electrode tab 34a, and the screen conductor 40 to the screen tab 36a.
  • the area of the tabs is then covered with copper-coated self-adhesive tape 44, of a type which is readily available commercially, which is preferably electrically connected to the screen 36 as indicated at 46.
  • this assembly is positioned within the cover 28, and the end cap is formed around these parts.
  • the end cap 30 may be formed in situ as an injection moulding, or may comprise two injection moulded parts which clip together around the assembly.
  • PVDF sheet 30 A suitable form of material for the PVDF sheet 30 is KYNAR- (trade mark) film from Pennwalt Corporation, preferably of 28p thickness.
  • a preferred material is prepared as follows.
  • a base film is prepared from vinylidene fluoride homopolymer, film grade resin (KYNAR 9816-30) by melt extrusion.
  • the base film is uniaxially stretch oriented at a stretch ratio ranging between about 4 and 5 to 1to produce a film having a thickness of about 28p.
  • the film is then electrically polarized (poled) in known manner by subjecting the film to a pressure of about 300 psi, a temperature of about 65°C, and voltage of 15 - 18 kV.
  • the temperature is held at 65°C for 10 minutes and the film is then permitted to cool at a rate of about 2°C/min over a period of 18 to 20 minutes.
  • the voltage is decreased to zero and the film is removed and stabilised under a pressure of about 350-400 psi and temperature of 40-60°C.
  • metallised layers 34, 36 are well understood in the art. Although silver ink printing is preferred for reasons of cost and convenience, other methods of metallisation well known in the art may be utilised.
  • the length of the electrode 34 is chosen to be approximately one-half the length of the PVDF ribbon 32 so that after folding there is a single layer of electrode in the centre of the assembly. If the electrode were to extend along the whole length of the ribbon, the capacitance of the device would be greatly increased without any increase in signal strength; the device would also be much more sensitive to the stiffness of the instrument part to which it is attached, since bending movement of that part would produce equal and opposite voltages in the parts of the electrode on opposite sides of the fold line.
  • the end cap 30 is provided with projecting fingers 42. These provide a finger grip for removing the assembly 10 from the instrument.
  • the cover 28, as shown in Fig. 3, is preferably formed by a sheet 48 of polyester film for securement to the instrument and a backing of woven fabric tape 50, these two being heat-sealed together around three edges to form a pocket.
  • the tape 50 is woven with transverse ribs, which obviates crinkling of the PVDF during handling; woven acetate transformer tape is suitable for this'purpose.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Stringed Musical Instruments (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
EP87303858A 1986-05-03 1987-04-30 Abnehmer für Saiteninstrumente Withdrawn EP0248528A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8610927 1986-05-03
GB868610927A GB8610927D0 (en) 1986-05-03 1986-05-03 Pick-up for string instrument

Publications (2)

Publication Number Publication Date
EP0248528A2 true EP0248528A2 (de) 1987-12-09
EP0248528A3 EP0248528A3 (de) 1989-03-15

Family

ID=10597357

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87303858A Withdrawn EP0248528A3 (de) 1986-05-03 1987-04-30 Abnehmer für Saiteninstrumente

Country Status (2)

Country Link
EP (1) EP0248528A3 (de)
GB (1) GB8610927D0 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0542706A1 (de) * 1991-11-15 1993-05-19 Clavia Digital Musical Instruments Ab Tonabnehmer für eine akustische Trommel und dazu gehörender Halter
US5449964A (en) * 1994-05-23 1995-09-12 Snyder; Michael J. Triggering transducer apparatus for acoustic device
WO1999039543A1 (en) * 1998-01-29 1999-08-05 Emf Acoustics Oy Ltd. Vibration transducer unit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2282627A1 (fr) * 1974-08-19 1976-03-19 Matsushita Electric Industrial Co Ltd Dispositif detecteur de vibrations mecaniques et procede d'adaptation, notamment dans le domaine musical
GB2072458B (en) * 1980-03-03 1984-01-04 C Tape Developments Ltd Improvements in electroacoustic tranducers

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0542706A1 (de) * 1991-11-15 1993-05-19 Clavia Digital Musical Instruments Ab Tonabnehmer für eine akustische Trommel und dazu gehörender Halter
US5345037A (en) * 1991-11-15 1994-09-06 Clavia Digital Musical Instruments Ab Acoustic drum transmitter and a holder therefor
US5449964A (en) * 1994-05-23 1995-09-12 Snyder; Michael J. Triggering transducer apparatus for acoustic device
WO1999039543A1 (en) * 1998-01-29 1999-08-05 Emf Acoustics Oy Ltd. Vibration transducer unit
US6336367B1 (en) 1998-01-29 2002-01-08 B-Band Oy Vibration transducer unit

Also Published As

Publication number Publication date
GB8610927D0 (en) 1986-06-11
EP0248528A3 (de) 1989-03-15

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Effective date: 19891031

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Inventor name: STRACHAN, JOHN SCOTT