EP1182642A2 - Resonanzplatte in Faserverbund-Bauweise - Google Patents
Resonanzplatte in Faserverbund-Bauweise Download PDFInfo
- Publication number
- EP1182642A2 EP1182642A2 EP01119532A EP01119532A EP1182642A2 EP 1182642 A2 EP1182642 A2 EP 1182642A2 EP 01119532 A EP01119532 A EP 01119532A EP 01119532 A EP01119532 A EP 01119532A EP 1182642 A2 EP1182642 A2 EP 1182642A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- fiber
- core plate
- fiber coating
- resonance
- fibers
- 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.)
- Granted
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Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10C—PIANOS, HARPSICHORDS, SPINETS OR SIMILAR STRINGED MUSICAL INSTRUMENTS WITH ONE OR MORE KEYBOARDS
- G10C3/00—Details or accessories
- G10C3/06—Resonating means, e.g. soundboards or resonant strings; Fastenings thereof
-
- 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
- G10D3/02—Resonating means, horns or diaphragms
-
- 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 invention relates to a resonance board in fiber composite construction, containing at least one of long fibers and carrier material existing fiber coating, for use for an acoustic Music instrument, especially a string instrument.
- the invention is also for others with a resonance body or soundboard provided acoustic musical instruments (such as Guitars and pianos) can be used to advantage.
- acoustic musical instruments such as Guitars and pianos
- structures in fiber composite construction mostly consist of long fibers, which are preferred are oriented in certain directions, and a carrier or matrix material, which is generally a thermosetting or is thermoplastic.
- the invention is an epoxy resin system.
- the invention is therefore based on the object of a resonance plate to create in fiber composite construction, which compared to award-winning, solid wood soundboard made in traditional construction a significantly improved acoustic quality has.
- the resonance plate according to the invention is intended in particular under Maintaining the familiar and desired timbre of a person Solid wood soundboard has a significantly higher sound power exhibit.
- Fiber coating 2 is one layer and at the same time multidirectional.
- the invention is based on the following considerations and To attempt:
- the cause of the sound radiation from the instrument is its natural vibrations.
- the frequencies and forms of vibration of the natural vibrations largely determine the timbre of the instrument.
- the formation of the natural vibrations is dependent on certain material properties, among which the anisotropy of the wood is of outstanding importance.
- Anisotropy is the directional dependence of the physical properties of a material.
- the anisotropy of the speed of sound of the longitudinal waves ie the ratio of the speed of sound in the longitudinal direction to the speed of sound in the transverse direction of the grain, is about 4: 1 for spruce wood and is therefore very pronounced.
- the approximately four times as high the speed of sound in the direction of the fibers compared to the speed of sound across the fibers is due to the higher longitudinal bending stiffness of the spruce wood.
- the high stiffness in the longitudinal direction of the fibers also makes sense due to the large forces occurring in this direction (due to the string tension).
- the conventional string instrument shows a very good correspondence between the anisotropy of the speed of sound and the outline proportions (length to width) due to the playing technique, which are also of the order of 4: 1.
- the anisotropy of the Fiber composite material produced resonance plate of anisotropy the conventional soundboard made of solid wood equivalent. Otherwise the requirement, natural frequencies and Natural vibration forms (and thus the desired and required Timbre), not met.
- the decisive factors for the sound radiation of the instrument are Vibration level of the natural vibrations. You are dependent on the vibrating mass of the resonance plate, its acoustic meaning results from the following connection:
- the vibration resistance (so-called. Impedance), which the resonance plate by the Opposing string vibrations generated, exciting alternating force, is the larger, the higher the vibrating mass of the resonance plate is.
- the invention therefore proceeds on the basis of these considerations a fundamentally different way to measure the anisotropy of the Fiber composite construction produced resonance plate in the to implement the required manner.
- the core plate with one more or less large number of cross-overlapping Fibre layers are completely coated solution according to the invention the multidirectional fiber alignment realized by means of single-layer fiber coating, or only Provide partial areas of the core plate with a fiber coating. ever according to the fiber layer pattern, the individual plate areas are preserved Degree and frequency of fiber direction changes different Stiffness ratios between longitudinal and transverse stiffness.
- the condition formulated in the feature of claim 1 of a single-layer and at the same time multidirectional fiber coating defines a fiber fabric that changes its fiber direction in a single layer.
- the fibers of individual fiber groups have - according to claim 4 - a similar direction, so they are "combed” oriented. It is therefore not a tangled fiber layer in which the fibers are also arranged in a multidirectional manner; However, while in the random fiber coating the individual fibers are “mixed together”, that is to say arranged randomly, in the fiber coating according to the invention the individual fibers form common, linear fiber patterns as fiber groups due to the “combed” arrangement. This is shown by way of example in FIGS. 1 to 3.
- the term “single-layer” does not exclude that individual fibers can overlap to a certain extent due to their small cross-section within the matrix system in which they are embedded. Such fiber overlays of a single-layer fiber coating are usually unavoidable in terms of production - even when using prepregs - because the fibers always have a certain freedom of movement during the liquefaction phase of the matrix system until it has finally hardened. Rather, the term “single-layer” excludes that a multi-layer structure is provided, as is provided in the conventional, cross-layer and / or layer-by-layer structure by a plurality of fiber coatings or fiber fabric lying one above the other.
- the resonance plate according to the invention thus allows instruments to build that in terms of listening habits (Tone color sensation) the conventional, made of solid wood Correspond to instruments, however with regard to their acoustic Efficiency significantly superior to traditional instruments are.
- the fiber coating according to claims 1 to 8 can in principle be produced by various methods.
- One possibility is given by hand laminating the core plate. Although this method requires little investment, it is time-consuming and less reproducible than other methods.
- Claim 9 therefore describes an alternative method, namely the production of a so-called prepreg ( pre- preg nated fibers).
- a prepreg is a semi-finished product pre-impregnated with a thermoplastic or thermosetting carrier material (matrix). It offers the advantage that the very complex impregnation process of the fibers with the matrix resin is carried out separately from the actual coating of the core plate. This process, which is very important for the quality and the property profile of the later fiber composite material, is carried out on a prepreg system under controlled and reproducible conditions [see.
- a thin solid wood layer (preferably made of spruce or maple wood), which occupies the entire surface of the resonance plate, is preferably applied to both sides of the core plate in order to additionally increase the overall flexural strength of the plate in the plate regions not provided with fiber composite. Since the fiber coating has a very high density, in particular when carbon fibers are preferably used, the feature of the partial coating according to claims 5 and 10 saves vibrating mass to a considerable extent and thus significantly increases the sound radiation of the resonance plate according to the invention.
- the changes in direction 6 of the fibers 2 of the multidirectional Fiber course are shown in Figs. 1 to 3.
- This Changes in direction can be abrupt. This is the case when the fiber coating according to claim 5 the shape of individual strips 3 or separate from each other Zones 4 has.
- the fiber coating is in partial areas 5 recessed by - according to claim 5 - only on at least one Part of the core plate 1, the fiber coating 2 is provided.
- Fiber properties, such as yarn count or yarn thickness, are according to Claim 6 over the total area of the fiber coating different (cf. in Fig. 1a those designated 7 different fibers of two zones).
- Fig. 1a represents a surface segment of the fiber coating according to the invention, which consists of many individual separated from each other, "patchwork-like" on the core plate applied (in the example shown unidirectional) zones 4 consists.
- the individual zones have one in themselves unidirectional fiber orientation.
- the longitudinal axis of the zones 4 takes the reference axis different angles. As a result, the whole Fiber coating a multi-directional, single layer Fiber coating realized.
- Fig. 1b shows - using the example of one Embodiment variant of the invention for use for String instruments - the realization of the single-layer, multidirectional fiber coating by single (im illustrated embodiment unidirectional) different oriented strips 3, depending on the position with L1 to L6 are designated and occupy larger areas of the total area.
- L1, L3 and L5 solid lines
- L2, L4 and L6 dashed lines
- the fiber course gives way to Top side from the grain of the bottom.
- a Stiffening in the transverse direction is achieved in the middle section and not because of the conventional, crosswise layer structure multiple laminates, but by the difference between the Fiber routing on the top and that on the bottom of the Core plate 1.
- the top and bottom of the core plate are in all Areas only with a single-layer fiber coating.
- At the border edges of the differently oriented strips 3 or Zones 4 allow manufacturing overlaps and intended.
- partial areas 5 of the resonance plate are not covered with fiber.
- the preferred embodiment does not have an abrupt one, but as in FIG 2 and 3, continuous changes in direction 6. Both in this case and in the case of the one shown in FIG. 1 abrupt changes in fiber direction, the fiber areas are "combed” oriented, the individual fibers form common fiber patterns.
- the Fiber coating different fiber proportions per unit area as shown in Figure 3 by areas 8 of increased fiber density (Fiber content per unit area) and areas 9 reduced Fiber density is illustrated. This can cause mass coating (mass per unit area) and strength properties Load directions and natural vibrations of the resonance plate be better adapted than with a constant fiber density.
- the multiple change of direction of the fibers creates a "blocking" effect in such a way that a stiffening portion of the fiber coating is also achieved transversely to the longitudinal direction of the resonance plate.
- This "blocking effect” which is illustrated in FIG. 3 at one point by way of example by the fiber course (direction of line 10) deviating from the longitudinal direction (direction of line 11) of the resonance plate, is provided in the preferred embodiment of the resonance plate. This increases the transverse rigidity of the resonance plate in a targeted manner.
- - as formulated in claim 7 the fiber course on the top deviates from the fiber course on the bottom of the core plate.
- a "warm” sounding wood to produce the corresponding damping range of the natural vibrations, has a preferred embodiment of the invention, according to claim 8, in at least a portion of the total area of the Resonance plate at least a thin damping layer.
- a thin outer layer made of solid wood applied by Preparation or priming and painting essential contributes to the required damping values of the resonance plate manufacture.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Manufacturing & Machinery (AREA)
- Stringed Musical Instruments (AREA)
- Laminated Bodies (AREA)
- Multicomponent Fibers (AREA)
Abstract
Description
Darüber hinaus zeigt sich beim herkömmlichen Streichinstrument eine sehr gute Übereinstimmung der Anisotropie der Schallgeschwindigkeit mit den spieltechnisch bedingten Umrißproportionen (Länge zu Breite), die ebenfalls in der Größenordnung von 4:1 liegen.
Dies wird - exemplarisch für eine Geige - durch folgendes Zahlenbeispiel anschaulich: Die durchschnittliche Gesamtmasse einer herkömmlichen, aus Fichtenholz gefertigen Geigendecke liegt zwischen 60 und 75 Gramm. Geometriegleiche Resonanzplatten aus Faserverbund-Werkstoff liefern in Abhängigkeit von der Anzahl der aufgebrachten Faserbeschichtungen (bei Faserbeschichtungen mit einem Flächengewicht von 100 g/m2) folgende Gesamtmassen:
- Bei je einer Faserbeschichtung auf Ober- und Unterseite der Kernplatte: 46 Gramm Gesamtmasse der Resonanzplatte.
- Bei je zwei Faserbeschichtungen auf Ober- und Unterseite der Kernplatte: 68 Gramm Gesamtmasse der Resonanzplatte.
- Bei je drei Faserbeschichtungen auf Ober- und Unterseite der Kernplatte: 91 Gramm Gesamtmasse der Resonanzplatte.
Der Begriff "einlagig" schließt nicht aus, daß sich einzelne Fasern aufgrund ihres geringen Querschnitts innerhalb des Matrixsystems, in das sie eingebettet sind, zu einem gewissen Anteil überlagern können. Solche Faserüberlagerungen einer einlagigen Faserbeschichtung sind i.d.R. fertigungstechnisch - selbst bei Verwendung von Prepregs - nicht zu vermeiden, denn die Fasern haben während der Verflüssigungsphase des Matrixsystems bis zu dessen endgültigem Aushärten stets eine gewisse Bewegungsfreiheit. Vielmehr grenzt der Begriff "einlagig" aus, daß ein mehrlagiger Aufbau vorgesehen ist, wie er beim herkömmlichen, kreuz- und/oder schichtweisen Aufbau durch mehrere übereinander liegende Faserbeschichtungen oder Fasergewebe gegeben ist.
In den nicht mit Faserverbund beschichteten Teilbereichen werden die Festigkeitseigenschaften der Resonanzplatte, insbesondere bei der vorzugsweisen Verwendung von Balsaholz als Kernplattenmaterial, von der Kernplatte selbst aufgebracht. Darüber hinaus wird vorzugsweise auf beide Seiten der Kernplatte je eine die Gesamtfläche der Resonanzplatte einnehmende, dünne Vollholzschicht (vorzugsweise aus Fichten- oder Ahornholz) aufgebracht, um die Gesamtbiegefestigkeit der Platte in den nicht mit Faserverbund versehenen Plattenbereichen zusätzlich zu erhöhen. Da die Faserbeschichtung, insbesondere bei der vorzugsweisen Verwendung von Kohlefasern, eine sehr hohe Dichte aufweist, wird durch das Merkmal der Teilbeschichtung gemäß der Ansprüche 5 und 10 schwingende Masse in erheblichem Umfang eingespart und damit die Schallabstrahlung der erfindunggemäßen Resonanzplatte wesentlich erhöht.
Auch bei den Ausführungsbeispielen mit kontinuierlicher Richtungsänderung 6 (Fig. 2 und 3) kann es zweckmäßig sein, dass - wie in Anspruch 7 formuliert - der Faserverlauf auf der Oberseite vom Faserverlauf auf der Unterseite der Kernplatte abweicht.
Claims (10)
- Resonanzplatte in Faserverbund-Bauweise für akustische Musikinstrumente, insbesondere zur Verwendung als zumindest eine der beiden Resonanzplatten des Resonanzkörpers von Streichinstrumenten, bestehend aus einer Kernplatte (1) und einer im Bereich wenigstens einer der beiden Außenseiten der Kernplatte vorgesehenen Faserbeschichtung (2) aus Langfasern, die in ein Trägermaterial eingebettet sind, dadurch gekennzeichnet, daß die Faserbeschichtung (2) einlagig und zugleich multidirektional ist.
- Resonanzplatte nach Anspruch 1, dadurch gekennzeichnet, daß in zumindest einer Faserbeschichtung der Faseranteil pro Flächeneinheit über die Gesamtfläche unterschiedlich verteilt ist.
- Resonanzplatte nach Anspruch 1, dadurch gekennzeichnet, daß wenigstens ein Teil der Fasern Richtungsänderungen (6) aufweisen.
- Resonanzplatte nach Anspruch 1, dadurch gekennzeichnet, daß die Fasern von einzelnen Fasergruppen eine gleichartige Richtung aufweisen.
- Resonanzplatte nach Anspruch 1, dadurch gekennzeichnet, daß die Faserbeschichtung (2) nur auf wenigstens einem Teilbereich wenigstens einer Außenseite der Kernplatte vorgesehen ist, wobei die Faserbeschichtung (2) dabei vorzugsweise die Form einzelner Streifen (3) oder einzelner voneinander getrennter Zonen (4) aufweist.
- Resonanzplatte nach Anspruch 1, dadurch gekennzeichnet, daß die Fasereigenschaften, wie Garnfeinheit oder Garndicke, über die Gesamtfläche der Faserbeschichtung unterschiedlich sind (7).
- Resonanzplatte nach Anspruch 1, dadurch gekennzeichnet, daß der Verlauf der Fasern der Faserbeschichtung (2) auf der Oberseite der Kernplatte (1) vom Verlauf der Fasern auf der Unterseite der Kernplatte (1) abweicht.
- Resonanzplatte nach Anspruch 1 dadurch gekennzeichnet, daß zusätzlich zur Faserbeschichtung in wenigstens einem Teilbereich der Gesamtfläche der Resonanzplatte eine dünne Dämpfungsschicht (12) vorgesehen ist.
- Halbzeug (Prepreg), in Form einer Faserschicht aus Langfasern, die in ein Trägermaterial (Matrix) eingebettet sind, dadurch gekennzeichnet, daß die Faserschicht einlagig und zugleich multidirektional ist.
- Resonanzplatte in Faserverbund-Bauweise für akustische Musikinstrumente, insbesondere zur Verwendung als zumindest eine der beiden Resonanzplatten des Resonanzkörpers von Streichinstrumenten, bestehend aus einer Kernplatte (1) und einer im Bereich wenigstens einer der beiden Außenseiten der Kernplatte vorgesehenen Faserbeschichtung (2) aus Langfasern, die in ein Trägermaterial eingebettet sind, dadurch gekennzeichnet, daß die Faserbeschichtung multidirektional und zugleich nur auf wenigstens einem Teilbereich wenigstens einer Außenseite der Kernplatte (1) vorgesehen ist, wobei die Faserbeschichtung (2) dabei vorzugsweise die Form einzelner Streifen (3) oder einzelner voneinander getrennter Zonen (4) aufweist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10041357 | 2000-08-23 | ||
DE10041357 | 2000-08-23 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1182642A2 true EP1182642A2 (de) | 2002-02-27 |
EP1182642A3 EP1182642A3 (de) | 2003-11-26 |
EP1182642B1 EP1182642B1 (de) | 2005-11-09 |
Family
ID=7653500
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01119532A Expired - Lifetime EP1182642B1 (de) | 2000-08-23 | 2001-08-14 | Resonanzplatte in Faserverbund-Bauweise |
EP01119531A Expired - Lifetime EP1182641B1 (de) | 2000-08-23 | 2001-08-14 | Resonanzplatte in Faserverbund-Bauweise |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01119531A Expired - Lifetime EP1182641B1 (de) | 2000-08-23 | 2001-08-14 | Resonanzplatte in Faserverbund-Bauweise |
Country Status (4)
Country | Link |
---|---|
US (3) | US6610915B2 (de) |
EP (2) | EP1182642B1 (de) |
AT (2) | ATE309596T1 (de) |
DE (3) | DE50107960D1 (de) |
Cited By (2)
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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 |
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US7151210B2 (en) * | 2002-09-26 | 2006-12-19 | Fender Musical Instruments Corporation | Solid body acoustic guitar |
US6777601B1 (en) * | 2003-04-28 | 2004-08-17 | Gregory L. Kerfoot | Stringed musical instrument soundboard system |
US7276868B2 (en) * | 2004-03-29 | 2007-10-02 | Allred Iii Jimmie B | Carbon-fiber laminate musical instrument sound board |
WO2006024210A1 (fr) * | 2004-09-01 | 2006-03-09 | Guobao Wang | Violon a integrite structurale |
DE102005027424A1 (de) * | 2005-06-14 | 2006-12-28 | Martin Schleske | Verfahren zur Verbesserung der akustischen Eigenschaften von Klangholz für Musikinstrumente |
US7342161B1 (en) * | 2005-08-05 | 2008-03-11 | Charles Edward Fox | Tonally improved hollow body stringed instrument |
US20070084335A1 (en) * | 2005-10-14 | 2007-04-19 | Silzel John W | Musical instrument with bone conduction monitor |
DE102006058849A1 (de) * | 2006-12-13 | 2008-06-19 | Martin Schleske | Verfahren zur Verbesserung der akustischen Eigenschaften von Fichtenklangholz für Musikinstrumente |
US7795513B2 (en) * | 2007-01-03 | 2010-09-14 | Luttwak Joseph E | Stringed musical instruments, and methods of making the same |
US7763784B2 (en) * | 2007-01-03 | 2010-07-27 | Luttwak Joseph E | Stringed musical instruments and methods of making thereof |
US20080202309A1 (en) * | 2007-02-22 | 2008-08-28 | Wiswell John R | Musical instrument and method of construction therefor |
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JP6156053B2 (ja) * | 2013-10-22 | 2017-07-05 | ヤマハ株式会社 | 弦楽器用板材の製造方法 |
JP6146258B2 (ja) * | 2013-10-22 | 2017-06-14 | ヤマハ株式会社 | 弦楽器用板材の製造方法 |
JP6743016B2 (ja) * | 2014-12-09 | 2020-08-19 | エアロ3 ギターズAero3 Guitars | エレキギター |
US10210846B1 (en) | 2016-02-25 | 2019-02-19 | II Robert Linn Bailey | Acoustic plate for a stringed instrument having a soundboard |
US10657931B2 (en) | 2018-03-16 | 2020-05-19 | Fender Musical Instruments Corporation | Lightweight body construction for stringed musical instruments |
JP7124368B2 (ja) * | 2018-03-20 | 2022-08-24 | ヤマハ株式会社 | 弦楽器のボディ及び弦楽器 |
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2001
- 2001-08-14 AT AT01119531T patent/ATE309596T1/de not_active IP Right Cessation
- 2001-08-14 EP EP01119532A patent/EP1182642B1/de not_active Expired - Lifetime
- 2001-08-14 EP EP01119531A patent/EP1182641B1/de not_active Expired - Lifetime
- 2001-08-14 DE DE50107960T patent/DE50107960D1/de not_active Expired - Lifetime
- 2001-08-14 AT AT01119532T patent/ATE309597T1/de not_active IP Right Cessation
- 2001-08-14 DE DE50107961T patent/DE50107961D1/de not_active Expired - Lifetime
- 2001-08-14 DE DE20113495U patent/DE20113495U1/de not_active Expired - Lifetime
- 2001-08-23 US US09/935,972 patent/US6610915B2/en not_active Expired - Fee Related
- 2001-08-23 US US09/935,973 patent/US6737568B2/en not_active Expired - Fee Related
- 2001-08-23 US US09/935,975 patent/US6770804B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US4353862A (en) * | 1980-05-12 | 1982-10-12 | Kaman Aerospace Corporation | Method for making sound board |
US4348933A (en) * | 1980-10-09 | 1982-09-14 | Currier Piano Company, Inc. | Soundboard assembly for pianos or the like |
US4429608A (en) * | 1981-07-20 | 1984-02-07 | Kaman Charles H | Stringed musical instrument top |
EP0433430A1 (de) * | 1989-07-05 | 1991-06-26 | Centre Nat Rech Scient | Bogeninstrument aus kunststoff. |
GB2289366A (en) * | 1994-05-13 | 1995-11-15 | Joseph Harold Stephens | A composite piano soundboard |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
US7208665B2 (en) | 2004-08-24 | 2007-04-24 | Martin Schleske | Soundboard of composite fibre material construction for acoustic stringed instruments |
US7235728B2 (en) | 2004-08-24 | 2007-06-26 | Martin Schleske | Soundboard of composite fibre material construction for acoustic musical instruments |
Also Published As
Publication number | Publication date |
---|---|
ATE309596T1 (de) | 2005-11-15 |
EP1182642A3 (de) | 2003-11-26 |
DE50107960D1 (de) | 2005-12-15 |
US6770804B2 (en) | 2004-08-03 |
US20020069743A1 (en) | 2002-06-13 |
EP1182642B1 (de) | 2005-11-09 |
DE20113495U1 (de) | 2001-10-31 |
EP1182641A3 (de) | 2003-09-10 |
US20020066353A1 (en) | 2002-06-06 |
EP1182641A2 (de) | 2002-02-27 |
US6737568B2 (en) | 2004-05-18 |
EP1182641B1 (de) | 2005-11-09 |
ATE309597T1 (de) | 2005-11-15 |
US6610915B2 (en) | 2003-08-26 |
US20020066354A1 (en) | 2002-06-06 |
DE50107961D1 (de) | 2005-12-15 |
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