EP0433430B1 - Streichinstrument aus kunststoff - Google Patents

Streichinstrument aus kunststoff Download PDF

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Publication number
EP0433430B1
EP0433430B1 EP90910767A EP90910767A EP0433430B1 EP 0433430 B1 EP0433430 B1 EP 0433430B1 EP 90910767 A EP90910767 A EP 90910767A EP 90910767 A EP90910767 A EP 90910767A EP 0433430 B1 EP0433430 B1 EP 0433430B1
Authority
EP
European Patent Office
Prior art keywords
wall
fibers
section
musical instrument
longitudinal
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.)
Expired - Lifetime
Application number
EP90910767A
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English (en)
French (fr)
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EP0433430A1 (de
Inventor
Charles Besnainou
Stéphane VAIEDELICH
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.)
Centre National de la Recherche Scientifique CNRS
Original Assignee
Centre National de la Recherche Scientifique CNRS
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Publication date
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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10D—STRINGED MUSICAL INSTRUMENTS; WIND MUSICAL INSTRUMENTS; ACCORDIONS OR CONCERTINAS; PERCUSSION MUSICAL INSTRUMENTS; AEOLIAN HARPS; SINGING-FLAME MUSICAL INSTRUMENTS; MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR
    • G10D3/00—Details of, or accessories for, stringed musical instruments, e.g. slide-bars
    • G10D3/22—Material for manufacturing stringed musical instruments; Treatment of the material

Definitions

  • the present invention relates to a musical instrument with a bow, that is to say belonging to the family of violins, violas, cellos and double basses.
  • a bowed musical instrument that is made using composite material is described, for example, in US-A-4,408,516.
  • the present invention intends to propose an instrument using as one of its components, a composite material which does not have the drawbacks of prior instruments.
  • a bowed musical instrument of which at least the soundboard consists of a thin wall of composite material comprising a superposition of at least two crossed plies of long oriented fibers, covered on at minus one of its faces of a filling material of density significantly lower than that of the fibers, in which the arrangement plies of fibers is such that the ratio: longitudinal elastic modulus / transverse elastic modulus of the wall is higher along the longitudinal axis of symmetry of the wall than in the vicinity of the lateral edges of the instrument .
  • the composite structure can be locally modified to reinforce such or such part of the wall, in particular at the level of the core.
  • the violin shown in Figures 1 and 2 conventionally comprises a soundboard 1, a bottom 2 and sides 3 closing laterally the sound box.
  • a handle 4 is coupled to the resonance box at the end of which strings 5 are fixed by pegs, these strings passing over an easel 6 located between the gills 7 of the soundboard, to lead to the tailpiece 8 of l 'instrument.
  • the soundboard 1 is a vaulted wall shaped by molding a composite material comprising a superposition of layers (A, B, C, D, ..) of carbon fibers prepreg in a polymerizable resin, these layers crossed at selected angles. On each side of this superposition, there is a cladding in wood veneer, Y and Z, which gives the table the characteristics from the vibratory point of view (damping, decrease in the overall density of the wall ).
  • Figure 4 is the drawing of an elementary fraction dS of the section of the table shown in Figure 3. This fraction, enlarged disproportionately for the purposes of the presentation, is crossed by fibers 10 to 14 (or bundles of fibers ), oriented in a direction determined according to the tablecloth to which they belong and / or their position in the tablecloth.
  • the fibers 10, 12 and 14, belonging to different layers are perpendicular to the fraction dS of section therefore parallel to the longitudinal axis 9 of symmetry of the instrument;
  • the fibers 11 and 13 belonging to plies interposed between the preceding plies are crossed with respect to the fibers 10,12,14. If we take for each of these fibers a unit length U and we project this unit length on the one hand on the plane of the section and on the other hand on a plane perpendicular to this section, the ratio of the linear sum of these projections in each of these two planes is significant of the ratio of the transverse and longitudinal elastic moduli.
  • the orientation of the fibers in each layer is modified in the direction of an accentuation of their "transversality" when one moves away from the axis of symmetry towards the edges, the sum of the longitudinal projections decreases and the sum of the transverse projections increases, therefore the abovementioned ratio of the moduli of elasticity decreases.
  • FIG. 5 shows a wall according to the invention in which one of the plies A of fibers is laterally truncated.
  • the wall thus constructed presents on these edges a lower modulus of elasticity ratio than in the center. It is of course possible to cut the sheet A according to a contour adapted to the final shape of the violin.
  • At least one of the plies A has fibers which are oriented at the edges much more transversely than at the center where they are almost parallel to the axis of symmetry of the wall. It is also achieved by this means, by combining one or more plies of this type by crossing them with layers of straight or longitudinal fibers, at the construction of a wall meeting the required characteristics.
  • the dashed lines mean that the soundboard 1 has among its tablecloths tablecloths of the kind of that A in Figure 6. It can also include tablecloths of the kind A of Figure 5.
  • the soundboard and the bottom may include local reinforcements by adding additional layers of limited surface.
  • additional layers of limited surface we know that there exists in violins a soul housed inside the sound box slightly forcibly between the table and the bottom, near one of the legs of the easel.
  • the contact zones of the table and the bottom with the core can be reinforced by adding, before plating, these additional partial plies which mechanically reinforce these zones where there is, due to the core, a concentration of stresses.
  • the ratio of the elastic moduli can be greater than that of an area in the vicinity of the axis of symmetry of the wall and therefore a fortiori of an area close to the edges of the instrument, but the surface concerned is limited.
  • the ratio of the elastic moduli is decreasing either continuously, or in stages from the center to the edges.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Stringed Musical Instruments (AREA)
  • Laminated Bodies (AREA)
  • Adornments (AREA)
  • Catching Or Destruction (AREA)
  • Details Of Garments (AREA)
  • Electrophonic Musical Instruments (AREA)

Claims (6)

  1. Streichinstrument, bei welchem zumindest die Klangdecke (1) durch eine dünne Wand aus Verbundmaterial gebildet ist, welches eine aus zumindest zwei sich kreuzenden Lagen (A,B,C,D...) von orientierten Langfasern bestehende Aufschichtung umfaßt, die zumindest an einer ihrer Flächen mit einem Beschichtungsmaterial (Y,Z) versehen ist, dessen Dichte deutlich kleiner ist als die der Fasern, gekennzeichnet durch eine Anordnung der Faserlagen derart, daß das Verhältnis des Längselastizitätsmoduls der Wand geteilt durch ihren Querelastizitätsmodul in einer der Längssymmetrieachse des Instruments benachbarten Wandzone höher ist als in einer den Rändern des Instruments benachbarten Wandzone.
  2. Streichinstrument nach Anspruch 1, dadurch gekennzeich net, daß, wenn man einen Elementarabschnitt (dS) eines Wandprofils und die Projektionen einer Längeneinheit (U) jeder diesen elementaren Profilabschnitt durchquerenden Faser einerseits auf die Profilebene und andererseits senkrecht zu dieser Ebene betrachtet, das Produkt der Anzahl von Längsprojektionen mit ihrer Länge bezogen auf das Produkt der Anzahl von Querprojektionen mit ihrer Länge bei einem der Profilmitte benachbarten Elementarabschnitt (dS) höher als bei einem dem Profilrand benachbarten Abschnitt ist.
  3. Streichinstrument nach Anspruch 2, dadurch gekennzeich net, daß die Orientierungen der einen Elementarabschnitt (dS) des Profils durchquerenden Fasern ungeachtet der Position dieses Abschnitts identisch sind, wobei die Änderung des vorgenannten Produkts erreicht wird, indem man die Anzahl der Lagen von im wesentlichen längsgerichteten Fasern in Richtung der Ränder verringert.
  4. Streichinstrument nach Anspruch 2, dadurch gekennzeich net, daß die Anzahl der jeden Elementarabschnitt (dS) des Profils durchquerenden Fasern unabhängig von der Position dieses Elementarabschnitts gleich ist, wobei die Änderung des vorgenannten Verhältnisses erreicht wird, indem man die Neigung der Fasern in jeder Faserlage ausgehend von ihrer Neigung gegenüber der Längssymmetrieachse der Wand ändert.
  5. Streichinstrument nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Wand zumindest eine Zone enthält, die durch zumindest eine zusätzliche Teillage von Fasern verstärkt ist.
  6. Instrument nach einem der vorhergehenden Ansprüche, da durch gekennzeichnet, daß die Bodenwand des Resonanzkastens in der gleichen Weise wie die Klangdecke gebildet ist.
EP90910767A 1989-07-05 1990-07-03 Streichinstrument aus kunststoff Expired - Lifetime EP0433430B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR8909048 1989-07-05
FR8909048A FR2649525B1 (fr) 1989-07-05 1989-07-05 Instrument de musique a archet en materiau composite
PCT/FR1990/000501 WO1991000589A1 (fr) 1989-07-05 1990-07-03 Instrument de musique a archet en composite

Publications (2)

Publication Number Publication Date
EP0433430A1 EP0433430A1 (de) 1991-06-26
EP0433430B1 true EP0433430B1 (de) 1995-11-02

Family

ID=9383503

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90910767A Expired - Lifetime EP0433430B1 (de) 1989-07-05 1990-07-03 Streichinstrument aus kunststoff

Country Status (8)

Country Link
US (1) US5171926A (de)
EP (1) EP0433430B1 (de)
JP (1) JPH0786749B2 (de)
AT (1) ATE129826T1 (de)
DE (1) DE69023318T2 (de)
ES (1) ES2081371T3 (de)
FR (1) FR2649525B1 (de)
WO (1) WO1991000589A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6737568B2 (en) 2000-08-23 2004-05-18 Martin Schleske Soundboard of composite fiber material construction
DE102004041010A1 (de) * 2004-08-24 2006-03-02 Martin Schleske Resonanzplatte in Faserverbund-Bauweise für akustische Saiteninstrumente
DE102004041011A1 (de) * 2004-08-24 2006-03-02 Martin Schleske Resonanzplatte in Faserverbund-Bauweise für akustische Musikinstrumente

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5333527A (en) * 1991-08-26 1994-08-02 Richard Janes Compression molded composite guitar soundboard
DE4313851C2 (de) * 1993-04-28 1997-01-16 Harry Hartmann Musikinstrument mit einem Resonanzkörper
US5895872A (en) * 1996-08-22 1999-04-20 Chase; Douglas S. Composite structure for a stringed instrument
US6284957B1 (en) 1997-06-12 2001-09-04 Luis G. Leguia Carbon fiber cello
US6060650A (en) 1998-01-09 2000-05-09 Mathew McPherson Arrangement of a sound hole and construction of a sound board in an acoustic guitar
US6372970B1 (en) 2000-05-19 2002-04-16 Kaman Music Corporation Stringed musical instrument body and neck assembly
US6294718B1 (en) 2000-05-19 2001-09-25 Kaman Music Corporation Stringed musical instrument top member
US6943283B2 (en) 2001-12-12 2005-09-13 Mcpherson Mathew Bracing system for stringed instrument
US6703545B2 (en) * 2002-05-22 2004-03-09 Mcferson Mathew A. Violin
CA2412687C (en) * 2002-11-26 2010-03-02 Mathew A. Mcpherson Neck connection for stringed musical instrument
US20070084335A1 (en) * 2005-10-14 2007-04-19 Silzel John W Musical instrument with bone conduction monitor
US20080202309A1 (en) * 2007-02-22 2008-08-28 Wiswell John R Musical instrument and method of construction therefor
ITFI20110028U1 (it) 2011-05-05 2012-11-06 Hiroshi Kugo Accessori per strumenti musicali ad arco

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3699836A (en) * 1970-09-09 1972-10-24 Leon Glasser Stringed musical instrument
US4364990A (en) * 1975-03-31 1982-12-21 The University Of South Carolina Construction material for stringed musical instruments
US4408516A (en) * 1981-08-24 1983-10-11 John Leonard K Graphite fibre violin
GB2202072B (en) * 1987-03-07 1991-04-03 Joseph Harold Stephens Improvements in or relating to violins

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6737568B2 (en) 2000-08-23 2004-05-18 Martin Schleske Soundboard of composite fiber material construction
US6770804B2 (en) 2000-08-23 2004-08-03 Martin Schleske Soundboard of composite fiber material construction
DE102004041010A1 (de) * 2004-08-24 2006-03-02 Martin Schleske Resonanzplatte in Faserverbund-Bauweise für akustische Saiteninstrumente
DE102004041011A1 (de) * 2004-08-24 2006-03-02 Martin Schleske Resonanzplatte in Faserverbund-Bauweise für akustische Musikinstrumente

Also Published As

Publication number Publication date
WO1991000589A1 (fr) 1991-01-10
JPH0786749B2 (ja) 1995-09-20
ATE129826T1 (de) 1995-11-15
DE69023318D1 (de) 1995-12-07
FR2649525B1 (fr) 1991-10-11
ES2081371T3 (es) 1996-03-01
EP0433430A1 (de) 1991-06-26
JPH03502502A (ja) 1991-06-06
DE69023318T2 (de) 1996-06-27
FR2649525A1 (fr) 1991-01-11
US5171926A (en) 1992-12-15

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