EP3605522B1 - Poids de clavier, unité de touche et procédé de fabrication d'unité de touche - Google Patents

Poids de clavier, unité de touche et procédé de fabrication d'unité de touche Download PDF

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Publication number
EP3605522B1
EP3605522B1 EP17901665.4A EP17901665A EP3605522B1 EP 3605522 B1 EP3605522 B1 EP 3605522B1 EP 17901665 A EP17901665 A EP 17901665A EP 3605522 B1 EP3605522 B1 EP 3605522B1
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EP
European Patent Office
Prior art keywords
key
weight
crimping
weight body
keyboard
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Active
Application number
EP17901665.4A
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German (de)
English (en)
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EP3605522A4 (fr
EP3605522A1 (fr
Inventor
Tadaharu Kato
Yoriko Ninomiya
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Yamaha Corp
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Yamaha Corp
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Publication of EP3605522A4 publication Critical patent/EP3605522A4/fr
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    • 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
    • G10C3/12—Keyboards; Keys
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10B—ORGANS, HARMONIUMS OR SIMILAR WIND MUSICAL INSTRUMENTS WITH ASSOCIATED BLOWING APPARATUS
    • G10B3/00—Details or accessories
    • G10B3/12—Keys or keyboards; Manuals
    • 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
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/32—Constructional details
    • G10H1/34—Switch arrangements, e.g. keyboards or mechanical switches specially adapted for electrophonic musical instruments
    • G10H1/344—Structural association with individual keys
    • G10H1/346—Keys with an arrangement for simulating the feeling of a piano key, e.g. using counterweights, springs, cams

Definitions

  • the present invention relates to a keyboard weight and a key unit used in a keyboard instrument, and a method for manufacturing the key unit.
  • a metal weight (hereinafter also referred to as a keyboard weight) used for weight adjustment of key touch during performance is attached to each key of a keyboard in a keyboard instrument such as a piano. Specifically, the keyboard weight is inserted and fixed in a through hole horizontally penetrating the key.
  • the keyboard weight is attached to each key so that the keys on the bass side of the keyboard become heavy and the keys on the treble side become light, thereby enhancing the sense of touch during performance.
  • the keyboard weight one made of lead formed in a cylindrical shape is widely used.
  • a metal material other than lead has been studied. It is conceivable to form the keyboard weight with a metal which is harder than lead, such as iron or the like.
  • FIG. 1(a), (b) of Patent Document 1 disclose a configuration in which a cylindrical caulking portion protruding in the axial direction of the keyboard weight is formed on the peripheral edge of both end faces of the keyboard weight in the axial direction.
  • a rod-like fixing tool is used from the left and right sides of the key to cause the cylindrical caulking parts at both axial ends in the axial direction to expand and bite into the inner wall of the through hole of the key, and thereby be fixed to the key.
  • the keyboard weight of Patent Document 1 has a configuration in which a notched groove into which the caulking part falls into is formed on a facing surface opposed to the inner surface of the through hole of the key.
  • Patent Document 1 Japanese Unexamined Patent Application, First Publication No. 2003-177740
  • the present invention has as its object to provide a technique for improving the attachment of a keyboard weight to a key.
  • a keyboard weight in embodiments of the invention includes a weight body formed in a cylindrical shape.
  • a groove is formed in a peripheral edge portion of an end face of the weight body, the groove extending along a peripheral edge of the end face, the end face being perpendicular to an axial direction of the weight body, and an outward inner surface of the groove among inner surfaces of the groove slopes toward outside of the weight body from a bottom portion of the groove toward an opening in the axial direction, the outward inner surface facing toward inside of the weight body in the radial direction, and an inclination angle of the outward inner surface is 30° or greater relative to the axial direction.
  • a key unit in one embodiment of the invention includes: a key including an insertion hole that opens to a side surface; and a keyboard weight that is inserted in the insertion hole and is caulked-fixed to the key.
  • the keyboard weight includes a cylindrical weight body that is inserted in the insertion hole, and the weight body includes a caulking portion that is formed on a peripheral edge portion of an end portion in an axial direction and that bites into an inner surface of the insertion hole of the key, and the caulking portion is formed in a region within ⁇ 45° with respect to a lengthwise direction of the key.
  • a key unit in one embodiment of the invention includes: a key including an insertion hole that opens to a side surface; and a cylindrical keyboard weight that is inserted in the insertion hole and is caulked-fixed to the key.
  • the keyboard weight includes a cylindrical weight body that is inserted in the insertion hole, and the weight body includes a caulking portion that is formed on a peripheral edge portion of an end portion in an axial direction and that bites into an inner surface of the insertion hole of the key, the caulking portion is formed in a region within ⁇ 45° with respect to a lengthwise direction of the key, and a diameter D of the weight body is equal to or greater than 60% of a thickness of the key.
  • an annular caulking portion is formed on a peripheral edge portion of an end portion of a weight body in an axial direction of the weight body, the weight body being formed in a cylindrical shape, a plurality of slits are formed in the caulking portion, the plurality of slits dividing the caulking portion into four or more caulking divided portions, and lengths of the caulking divided portions in a circumferential direction of the caulking portion are equal to each other.
  • an annular caulking portion is formed on an end portion of a weight body in an axial direction of the weight body, the weight body being formed in a cylindrical shape, a plurality of slits are formed in the caulking portion, the plurality of slits dividing the caulking portion into a plurality of caulking divided portions, and a width dimension of the slits in a circumferential direction of the caulking portion is 1 mm or more and 3 mm or less.
  • a method for manufacturing a key unit in one embodiment of the invention comprising, by inserting a keyboard weight into an insertion hole of a key and inserting a caulking projection of a caulking tool into a groove of a weight body, bending the caulking portion to an outer side in a radial direction of the keyboard weight and causing the caulking portion to bite into an inner surface of the insertion hole of the key, to thereby fixing the keyboard weight to the key, the keyboard weight having a groove that is formed in a peripheral edge portion of an end face of the weight body, the groove extending along a peripheral edge of the end face, the end face being perpendicular to an axial direction of the weight body, the weight body being formed in a cylindrical shape, the insertion hole opening to a side surface of the key, the caulking portion being positioned on an outer side of the groove in the radial direction of the keyboard weight.
  • a keyboard weight 10 of the embodiment shown in FIGS. 1 and 2 includes a weight body 11 formed in a pillar-like shape (cylindrical shape in FIGS. 1 and 2 ).
  • the keyboard weight 10 is formed entirely of a metal such as iron, for example.
  • the material for forming the keyboard weight 10 is not limited to iron, and for example, copper or the like can also be employed.
  • the keyboard weight 10 is used by being inserted into and fixed in an insertion hole 21 formed in a key 20 of a keyboard of a keyboard instrument.
  • a key unit 20A together with the key 20 are constituted by the keyboard weight 10 being fixed to the key 20.
  • an end face 12 (hereinafter also referred to as a weight body end face 12) perpendicular to the axial direction of the weight body 11 is formed at both axial ends of the weight body 11 in the axial direction.
  • a groove 13 extending along a peripheral edge of the weight body end face 12 is formed in the peripheral edge portion of the end face 12 of the weight body 11.
  • the groove 13 is formed in an annular shape along the peripheral edge of the weight body end face 12.
  • an outward inner surface 13a that faces toward the inside of the weight body 11 in the radial direction slopes toward the outside of the weight body 11 in the radial direction as the outward inner surface 13a extends from the bottom portion of the groove 13 toward an opening in the axial direction of the weight body 11.
  • An inclination angle ⁇ of the outward inner surface 13a of the groove 13 relative to the axial direction of the weight body 11 is 30° or greater relative to the axial direction of the weight body 11.
  • the inclination angle ⁇ of the outward inner surface 13a of the groove 13 is preferably 30° to 60°.
  • an inward inner surface 13b facing the outward inner surface 13a in the width direction of the groove 13 is formed perpendicular to the radial direction of the weight body 11.
  • the inclination angle of the inward inner surface 13b relative to the axial direction of the weight body 11 is 0°.
  • a portion 14 located outside the groove 13 in the radial direction of the weight body 11 of the keyboard weight 10 shown in FIGS. 1 and 2 is made to bite into an inner surface of the insertion hole 21 of the key 20 to function as a caulking portion for fixing the keyboard weight 10 to the key 20.
  • the portion 14 positioned on the outer side of the groove 13 in the radial direction of the weight body 11 of the keyboard weight 10 is hereinafter referred to as the caulking portion 14.
  • the caulking portion 14 is annularly formed in a peripheral edge portion at end portions of the weight body 11 in the axial direction.
  • the caulking portion 14 is formed with a plurality of slits 14b that divide the caulking portion 14 into three or more caulking divided portions 14a.
  • the lengths of the caulking divided portions 14a in the circumferential direction of the caulking portion 14 are equal to each other.
  • the length of each of the caulking divided portions 14a in the circumferential direction of the caulking portion 14 may also differ from each other and for example be non-uniform.
  • the caulking portion 14 shown in FIG. 1 and FIG. 6 is divided into four equally divided caulking divided portions 14a in the circumferential direction by the slits 14b formed at four positions in the circumferential direction of the caulking portion 14 (circumferential direction of the weight body 11).
  • the width dimension of the slit 14b of the caulking portion 14 (the dimension in the circumferential direction of the caulking portion 14) be 1 mm or more and 3 mm or less.
  • an insertion hole 21 in the key 20 is formed so as to extend from a side surface of the key 20 in a lateral direction (the vertical direction in FIG. 3 , the direction orthogonal to the paper surface in FIG. 6 ) of the key.
  • the insertion hole 21 should be open to at least one of the side surfaces of both sides in the left-right direction of the key 20.
  • the insertion hole 21 of the key 20 shown in FIG. 3 is formed so as to penetrate the key 20 in the left-right direction thereof and thereby opens to the side faces on both sides of the key 20 in the left-right direction.
  • the keyboard weight 10 that is used is one in which the outer diameter of the cylindrical weight body 11 matches the inner diameter of the insertion hole 21 of the key 20 or one in which the outer diameter of the cylindrical weight body 11 is slightly smaller than the inner diameter of the insertion hole 21.
  • the keyboard weight 10 is inserted into the insertion hole 21 so that the axial direction of the weight body 11 matches the depth direction of the insertion hole 21 of the key 20 (the axial direction of the insertion hole 21).
  • the insertion hole 21 of the key 20 shown in FIG. 6 is formed at a plurality of positions in the lengthwise direction of the key 20 (the left-right direction in FIG. 6 ).
  • the keyboard weight 10 is inserted into one of the insertion holes 21 selected from the plurality of insertion holes 21 of the key 20 and fixed to the key 20.
  • the keyboard weight 10 inserted into the insertion hole 21 of the key 20 is fixed to the key 20 by using a caulking tool 30 to bend the caulking divided portions 14a of the caulking portion 14 on both sides of the weight body 11 in the axial direction to the outer side in the radial direction of the weight body 11 so as to bite into the inner surface of the insertion hole 21 of the key 20.
  • the caulking tool 30 is constituted with a caulking projection 32 projecting out at a distal outer periphery of a rod-like tool body 31.
  • the caulking projection 32 is for bending the caulking divided portions 14a of the keyboard weight 10 toward the outer side in the radial direction of the weight body 11.
  • the caulking divided portion 14a pressed by the caulking projection 32 is bent to the outer side of the weight body 11 in the radial direction.
  • the key unit 20A can be manufactured by the following method for manufacturing a key unit using the caulking tool 30 mentioned above.
  • the keyboard weight 10 is inserted into the insertion hole 21 of the key 20.
  • the caulking projections 32 of the caulking tool 30 are pushed into the groove 13 of the keyboard weight 10, and the caulking portions 14 on both sides in the axial direction of the weight body 11 of the keyboard weight 10 (specifically the caulking divided portions 14a) are bent outward in the radial direction of the weight body 11 to bite into the inner surface of the insertion hole 21 of the key 20, thereby fixing the keyboard weight 10 to the key 20.
  • the key unit 20A can be manufactured.
  • the bending of the caulking divided portions 14a to the outer side in the radial direction of the weight body 11 by the caulking projections 32 of the caulking tool 30 is not necessarily uniform over the of the caulking divided portions 14a in the circumferential direction of the caulking portion 14, with the existence of variations being possible.
  • the deformation of the caulking divided portions 14a when bending the caulking divided portions 14a outward in the radial direction of the weight body 11 by the caulking tool 30 does not necessarily proceed uniformly and simultaneously over the entirety of the caulking divided portions 14a in the circumferential direction of the caulking portion 14.
  • the width dimension of the slit 14b in the caulking portion 14 is 1 mm or more, when using the caulking tool 30 to bend the caulking division portion 14a outward in the radial direction of the weight body 11, it is possible to reliably avoid abutting of caulking divided portions 14a that are adjacent via the slit 14b and thereby bending of caulking divided portions 14a not to be bent (co-bending).
  • the width dimension of the slit 14b of the caulking portion 14 is preferably 3 mm or less from the viewpoint of minimizing the amount of processing by machining and ease of formation.
  • the caulking divided portions 14a formed in a region within ⁇ 45° with respect to the lengthwise direction of the key 20 are made to bite into the inner surface of the insertion hole 21 of the key 20 to be fixed to the key 20.
  • the caulking divided portions 14a that bite into the inner surface of the insertion hole 21 of the key 20 are those positioned in regions in which the entirety in the circumferential direction of the caulking portions 14 is within ⁇ 45° with respect to the lengthwise direction of the key 20.
  • the caulking divided portion 14a in which the entirety in the circumferential direction of the caulking portion 14 is positioned in a region within ⁇ 45° with respect to the lengthwise direction of the key 20 is hereinafter also referred to as a key lengthwise direction caulking divided portion.
  • the key lengthwise direction caulking divided portion is positioned on both sides via the center axis of the weight body 11.
  • a constitution in which only two caulking divided portions 14a arranged in regions within ⁇ 45° with respect to the lengthwise direction of the key 20 are made to bite into the inner surface of the insertion hole 21 of the key 20 to fix (caulking-fix) the keyboard weight 10 to the key 20 is advantageous in that it prevents minute deformation of the key 20 due to caulking-fixing from affecting the upper surface 22 of the key 20 (hereinafter also referred to as the key upper surface 22).
  • the keyboard weight 10 in which the diameter D of the weight body 11 (weight body outer diameter) is equal to or greater than 60% of the thickness of the key 20 (vertical dimension in FIG. 6 ).
  • the outward inner surface 13a of the groove 13 formed in the peripheral edge portion of the end face 12 of the weight body 11 slopes to the outside of the weight body 11 in the radial direction heading from the bottom portion of the groove 13 toward an opening in the axial direction of the weight body 11, the inclination angle of the outward inner surface 13a being 30° or greater relative to the axial direction of the weight body 11.
  • the keyboard weight 10 of the present embodiment is one that enables a reduction in the cutting amount when for example being formed from a metal member by machining compared with the keyboard weight of FIGS. 1 (a) and 1 (b) of Patent Document 1. For this reason, in the keyboard weight 10 of the present embodiment, it is possible to reduce the amount of material discarded when forming by machining, and to shorten the forming time.
  • the key unit 20A of the present embodiment in the caulking portion 14 of the keyboard weight 10, only the portions formed in a region within ⁇ 45° with respect to the lengthwise direction of the key 20 are made to bite into the inner surface of the insertion hole 21 of the key 20. For this reason, it is possible to easily avoid the caulking-fixing having an effect on the key upper surface 22.
  • the keyboard weight 10 in the caulking portion 14 of the keyboard weight 10, only the portions formed in a region within ⁇ 45° with respect to the lengthwise direction of the key 20 are made to bite into the inner surface of the insertion hole 21 of the key 20, and the keyboard weight 10 is adopted in which the diameter of the weight body 11 is equal to or greater than 60% of the thickness of the key 20. For this reason, it is possible to expand the adjustment range of key touch weight adjustment with the keyboard weight 10.
  • the plurality of slits 14b that divide the caulking portion 14 into three or more caulking divided portions 14a are formed in the annular caulking portion 14 at end portions of the weight body 11 in the axial direction, with the length of each of the caulking divided portions 14a in the circumferential direction of the caulking portion 14 being equal to one another among the plurality of caulking divided portions 14a.
  • the force for bending the caulking portion outward in the radial direction of the weight body 11 to bite into the inner surface of the insertion hole 21 of the key 20 is smaller, and so the work of bending the caulking portion outward in the radial direction of the weight body 11 to caulk-fix the weight body 11 to the key 20 can be performed easily.
  • the width dimension of the slit 14b in the circumferential direction of the annular caulking portion 14 is 1 mm or more and 3 mm or less.
  • the caulking portion 14 of the weight body 11 of the keyboard weight 10 can be bent outward in the radial direction of the weight body 11 to be made to bite into the inner surface of the insertion hole 21 of the key 20. Therefore, the fixing of the keyboard weight 10 to the key 20 can be performed easily and efficiently.
  • all of the plurality of caulking divided portions 14a of each caulking portion 14 at both end portions of the weight body 11 in the axial direction may be bent outward in the radial direction of the weight body 11 to bite into the inner surface of the insertion hole 21 of the key 20 and thereby be fixed to the key 20.
  • the reference numeral of the key unit is 20B.
  • the groove may not be formed, and the caulking portion may be formed to project from the end faces of the weight body.
  • the caulking divided portion is not limited to an arc when viewed from the axial direction, and may be formed into any shape such as a circle, a triangle, or a fan shape.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Insertion Pins And Rivets (AREA)
  • Percussive Tools And Related Accessories (AREA)

Claims (6)

  1. Unité de touche (20A) comprenant:
    une touche (20) qui s'étend dans une direction longitudinale, la touche (20) comprenant un trou d'insertion (21) qui s'ouvre sur une surface latérale et s'étend dans une direction orthogonale à la direction longitudinale ; et
    un poids de clavier (10) qui est inséré dans le trou d'insertion (21) et est serti et fixé à la touche (20),
    dans laquelle le poids de clavier (10) comprend un corps de poids (11) cylindrique qui est inséré dans le trou d'insertion (21), et le corps de poids (11) comprend une portion de sertissage (14) qui est formée sur une portion bord périphérique d'une portion d'extrémité dans une direction axiale et qui mord dans une surface intérieure du trou d'insertion (21) de la touche (20), et
    la portion de sertissage (14) comprend quatre portions divisées de sertissage (14a) qui comprennent : deux portions divisées de sertissage (14a) qui sont positionnées sur les deux côtés du corps de poids (11) dans la direction axiale et sont formées dans des régions dans les ±45° par rapport à la direction longitudinale de la touche (20) ; et deux portions divisées de sertissage (14a) qui sont agencées à l'extérieur des régions dans les ±45° par rapport à la direction longitudinale de la touche (20),
    caractérisée en ce que :
    parmi les quatre portions divisées de sertissage (14a), seules les deux portions divisées de sertissage (14a) qui sont formées dans les régions dans les ±45° mordent dans la surface intérieure du trou d'insertion (21) de la touche (20).
  2. Unité de touche (20A) selon la revendication 1,
    dans laquelle une rainure (13) est formée dans une portion bord périphérique d'une face d'extrémité (12) du corps de poids (11), la rainure (13) s'étendant le long d'un bord périphérique de la face d'extrémité (12), la face d'extrémité (12) étant perpendiculaire à la direction axiale du corps de poids (11), et
    une surface intérieure vers l'extérieur (13a) de la rainure (13) parmi des surfaces intérieures de la rainure (13) penche vers l'extérieur du corps de poids (11) à partir d'une portion inférieure de la rainure (13) vers une ouverture dans la direction axiale, la surface intérieure vers l'extérieur (13a) faisant face vers l'intérieur du corps de poids (11) dans la direction radiale, et un angle d'inclinaison de la surface intérieure vers l'extérieur (13a) est de 30° ou supérieur relativement à la direction axiale.
  3. Unité de touche (20A) selon la revendication 1, dans laquelle:
    un diamètre (D) du corps de poids (11) est égal à ou supérieur à 60 % d'une épaisseur de la touche (20).
  4. Unité de touche (20A) selon la revendication 1, dans laquelle
    la portion de sertissage (14) présente une forme annulaire,
    une pluralité de fentes (14b) sont formées dans la portion de sertissage (14), la pluralité de fentes (14b) divisant la portion de sertissage (14) en quatre portions divisées de sertissage (14a), et
    les longueurs des quatre portions divisées de sertissage (14a) dans une direction circonférentielle de la portion de sertissage (14) sont égales les unes aux autres.
  5. Unité de touche (20A) selon la revendication 1, dans laquelle
    la portion de sertissage (14) présente une forme annulaire,
    une pluralité de fentes (14b) sont formées dans la portion de sertissage (14), la pluralité de fentes (14b) divisant la portion de sertissage (14) en quatre portions divisées de sertissage (14a), et
    une dimension de largeur des fentes (14b) dans une direction circonférentielle de la portion de sertissage (14) est de 1 mm ou plus et 3 mm ou moins.
  6. Procédé de fabrication d'une unité de touche (20A), comprenant, en insérant un poids de clavier (10) dans un trou d'insertion (21) d'une touche (20) et en insérant une saillie de sertissage (32) d'un outil de sertissage (30) dans une rainure (13) d'un corps de poids (10), une courbure de la portion de sertissage (14) vers un côté extérieur dans une direction radiale du poids de clavier (10) et le fait d'amener la portion de sertissage (14) à mordre dans une surface intérieure du trou d'insertion (21) de la touche (20), pour fixer ainsi le poids de clavier (10) à la touche (20), le poids de clavier (10) présentant une rainure (13) qui est formée dans une portion bord périphérique d'une face d'extrémité (12) du corps de poids (10), la touche (20) s'étendant dans une direction longitudinale, la rainure (13) s'étendant le long d'un bord périphérique de la face d'extrémité (12), la face d'extrémité (12) étant perpendiculaire à une direction axiale du corps de poids (10), le corps de poids (10) ayant une forme cylindrique, le trou d'insertion (21) s'ouvrant sur une surface latérale de la touche (20) et s'étendant dans une direction orthogonale à la direction longitudinale, la portion de sertissage (14) étant positionnée sur un côté extérieur de la rainure (13) dans la direction radiale du poids de clavier (10),
    dans lequel la portion de sertissage (14) comprend quatre portions divisées de sertissage (14a) qui comprennent : deux portions divisées de sertissage (14a) qui sont positionnées sur les deux côtés du corps de poids (11) dans la direction axiale et sont formées dans des régions dans les ±45° par rapport à la direction longitudinale de la touche (20) ; et deux portions divisées de sertissage (14a) qui sont agencées à l'extérieur des régions dans les ±45° par rapport à la direction longitudinale de la touche (20),
    caractérisé en ce que :
    parmi les quatre portions divisées de sertissage (14a), seules les deux portions divisées de sertissage (14a) qui sont formées dans les régions dans les ±45° mordent dans la surface intérieure du trou d'insertion (21) de la touche (20).
EP17901665.4A 2017-03-23 2017-03-23 Poids de clavier, unité de touche et procédé de fabrication d'unité de touche Active EP3605522B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/011841 WO2018173219A1 (fr) 2017-03-23 2017-03-23 Poids de clavier, unité de touche et procédé de fabrication d'unité de touche

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EP3605522A1 EP3605522A1 (fr) 2020-02-05
EP3605522A4 EP3605522A4 (fr) 2020-11-25
EP3605522B1 true EP3605522B1 (fr) 2022-02-09

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JP (1) JP6760482B2 (fr)
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JP7347022B2 (ja) * 2019-08-30 2023-09-20 ヤマハ株式会社 楽器用錘、鍵盤

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JP2003122344A (ja) * 2001-10-09 2003-04-25 Kawai Musical Instr Mfg Co Ltd 鍵 盤
JP2003177740A (ja) 2001-12-12 2003-06-27 Kawai Musical Instr Mfg Co Ltd 鍵盤錘
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JP4651350B2 (ja) * 2004-10-05 2011-03-16 ヤマハ株式会社 鍵用重り
JP2006106368A (ja) * 2004-10-05 2006-04-20 Yamaha Corp 鍵用重り
CN203210475U (zh) * 2013-04-23 2013-09-25 浙江林碳木业科技有限公司 一种大幅面速生材指接板

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CN110447064A (zh) 2019-11-12
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