JP2012113145A

JP2012113145A - Key of electronic musical instrument

Info

Publication number: JP2012113145A
Application number: JP2010262404A
Authority: JP
Inventors: Shin Yamamoto; 信山本; Ichiro Osuga; 一郎大須賀; Shunsuke Ichiki; 俊介市来
Original assignee: Yamaha Corp
Current assignee: Yamaha Corp
Priority date: 2010-11-25
Filing date: 2010-11-25
Publication date: 2012-06-14
Anticipated expiration: 2030-11-25
Also published as: JP5771956B2

Abstract

PROBLEM TO BE SOLVED: To provide a key of an electronic musical instrument, the surface texture of which is close to solid wood and on which a natural woodgrain pattern approximating solid wood is formed by irregularities.SOLUTION: A plurality of convex linear portions 21 are extended on surfaces of a first top surface part 11a, a first left surface part 13a, a second left surface part 13b, and a right surface part 14 of a white key. A plurality of fine convex portions 22 and fine concave portions 23 are provided on surfaces of the first top surface part 11a, the first left surface part 13a, the second left surface part 13b, and the right surface part 14. The linear portions 21, the fine convex portions 22, and the fine concave portions 23 are formed integrally with an outer shape of the white key by injection molding. A particulate material is preliminarily added to a resin material for use in the injection molding, and the particulate material is made to partially project from the surface of the white key to form a plurality of micro convex portions. Intervals of the micro convex portions are set to 20% or less of intervals of adjacent fine convex portions 22, and projection heights of the micro convex portions are set to 20% or less of height difference between the fine convex portions 22 and the fine concave portions 23.

Description

本発明は、表面に模様が形成された電子楽器の鍵に関する。 The present invention relates to a key for an electronic musical instrument having a pattern formed on the surface.

従来から、例えば下記特許文献１に示されているように、木製の鍵を模擬した電子楽器の鍵は知られている。この鍵は、射出成形によって形成される。そして、この鍵の材料として、樹脂材料に木粉を添加した木粉含有樹脂を用いることにより、視覚的及び触覚的に木製の鍵を模擬している。また、この鍵においては、射出成形によって形成した鍵の表面を、不織布表面処理材、サンドペーパーなどを用いて研削することにより、木の導管などの模様を形成している。 Conventionally, as shown in, for example, Patent Document 1 below, a key of an electronic musical instrument that simulates a wooden key is known. This key is formed by injection molding. Then, as this key material, a wooden key is simulated visually and tactilely by using a wood flour-containing resin obtained by adding wood flour to a resin material. In this key, the surface of the key formed by injection molding is ground using a nonwoven fabric surface treatment material, sandpaper or the like, thereby forming a pattern such as a wooden conduit.

特開２００８−５２２６５号公報JP 2008-52265 A

しかし、不織布表面処理材、サンドペーパーなどを用いた研削により形成される不規則な断面Ｖ字状の溝によっては、視覚的及び触覚的に凹凸感に乏しく、無垢材に近い自然な木目調の凹凸模様を形成することは困難であった。 However, due to irregular V-shaped grooves formed by grinding using non-woven surface treatment material, sandpaper, etc., the texture of the texture is poor visually and tactilely, and the natural grain tone is close to that of solid wood. It was difficult to form an uneven pattern.

本発明は上記問題に対処するためになされたもので、その目的は、表面の質感を無垢材に近づけるとともに、凹凸によって無垢材に近い自然な木目調の模様を形成した電子楽器の鍵を提供することにある。なお、下記本発明の各構成要件の記載においては、本発明の理解を容易にするために、後述する実施形態の対応箇所の符号を括弧内に記載しているが、本発明の各構成要件は、実施形態の符号によって示された対応箇所の構成に限定解釈されるべきものではない。 The present invention has been made to address the above problems, and its purpose is to provide a key for an electronic musical instrument in which the texture of the surface is close to that of a solid material and a natural woodgrain pattern close to that of the solid material is formed by unevenness. There is to do. In the description of each constituent element of the present invention below, in order to facilitate understanding of the present invention, reference numerals of corresponding portions of the embodiments described later are shown in parentheses, but each constituent element of the present invention is described. Should not be construed as being limited to the configurations of the corresponding portions indicated by the reference numerals of the embodiments.

上記目的を達成するために、本発明の特徴は、表面（１１ａ、１３ａ、１３ｂ、１４）に凹凸によって装飾模様が形成された電子楽器の鍵（１０）において、装飾模様を、所定の間隔をおいて形成された連続的又は断続的な、凸状の尾根部又は凹状の谷溝部又は高さのずれた段状の段差部からなる複数の線状部（２１、２１Ａ、２１Ｂ）で形成し、装飾模様が形成された面に、線状部の高低差よりも小さな高低差を形成する複数の微小凸部（２２）又は微小凹部（２３）を設けるとともに、装飾模様が形成された面に、隣り合う微小凸部同士もしくは微小凹部同士の間隔又は隣り合う微小凸部と微小凹部の間隔のうちの最小の間隔の２０％以下の間隔で配置され、装飾模様が形成された面からの突出高さが、微小凸部及び微小凹部のうちの一方又は両方によって形成された高低差のうちの最小の高低差の２０％以下である複数の極小凸部を設けたことにある。これによれば、線状部によって、鍵の表面に陰影が形成され、装飾模様がくっきりと表れる。したがって、視覚的に木製の鍵を模擬できる。また、触覚的にも凹凸を認識でき、木製の鍵を模擬できる。さらに、微小凸部及び微小凹部のうちの一方又は両方によって、木の切断面の組織の大まかな形状を模擬し、極小凸部によって、前記組織の細部を模擬できる。特に、極小凸部を設けることによって、精細な木質調を醸し出せるとともに、自然木の仕上げ肌に忠実な感触を得ることができる。これによって高級感を出すこともできる。 In order to achieve the above object, the present invention is characterized in that in the electronic musical instrument key (10) in which a decorative pattern is formed by unevenness on the surface (11a, 13a, 13b, 14), the decorative pattern is arranged at a predetermined interval. Formed by a plurality of linear portions (21, 21A, 21B) composed of continuous or intermittent convex ridges or concave troughs or stepped steps with different heights. The surface on which the decorative pattern is formed is provided with a plurality of minute convex portions (22) or minute concave portions (23) that form a height difference smaller than the height difference of the linear portion, and on the surface on which the decorative pattern is formed. , Protruding from the surface on which the decorative pattern is formed, arranged at an interval of 20% or less of the interval between the adjacent minute convex portions or between the minute concave portions or between the adjacent minute convex portions and the minute concave portion. The height is one of the minute convex part and the minute concave part. Or in the provision of the minimum of the plurality of minimum protrusion is 20% or less of the height difference of the height difference formed by both. According to this, a shadow is formed on the surface of the key by the linear portion, and the decorative pattern appears clearly. Therefore, the wooden key can be visually simulated. Also, it can tactilely recognize the unevenness and simulate a wooden key. Furthermore, the rough shape of the tissue of the cut surface of the tree can be simulated by one or both of the minute convex portion and the minute concave portion, and the details of the tissue can be simulated by the minimal convex portion. In particular, by providing the minimal convex portion, it is possible to bring out a fine woody tone and to obtain a feeling faithful to the finished skin of natural wood. This can give a sense of quality.

また、本発明の他の特徴は、鍵は、射出成形によって一体的に形成され、極小凸部は、鍵を射出成形によって形成するための樹脂材料に添加された微粒子（２５）によって形成されていることにある。これによれば、線状部、微小凸部及び微小凹部は、射出成形によって一体的に形成されるので、上記従来の電子楽器の鍵のような、仕上げ工程が不要であり、簡単に木目調の模様及び木の切断面の組織の大まかな形状を形成できる。また、樹脂材料に微粒子を添加することにより、成形型による転写が不可能な極小凸部を形成するようにした。これにより、簡単に木の断面の組織の細部を模擬することができ、鍵の木質感を向上させることができる。 Another feature of the present invention is that the key is integrally formed by injection molding, and the minimal convex portion is formed by fine particles (25) added to a resin material for forming the key by injection molding. There is to be. According to this, since the linear portion, the minute convex portion, and the minute concave portion are integrally formed by injection molding, a finishing process is not required as in the case of the above-described conventional electronic musical instrument key. The rough shape of the pattern and the structure of the cut surface of the tree can be formed. Further, by adding fine particles to the resin material, a minimal convex portion that cannot be transferred by a molding die is formed. As a result, the details of the tissue of the cross section of the tree can be easily simulated, and the texture of the key tree can be improved.

また、本発明の他の特徴は、鍵は、射出成形によって一体的に形成され、極小凸部は、鍵を射出成形によって形成するための樹脂材料に添加された繊維片（２６）によって形成されていることにある。この場合、繊維片の配列方向と繊維片に近接する線状部の延設方向との間の角度が、±２０°以内であるようにするとよい。これによれば、微小凸部が繊維状になるので、鍵の木質感をさらに向上させることができる。また、繊維片の配列方向と線状部の延設方向を揃えることにより、さらに木質感を向上させることができる。 Another feature of the present invention is that the key is integrally formed by injection molding, and the minimal convex portion is formed by a fiber piece (26) added to a resin material for forming the key by injection molding. There is in being. In this case, it is preferable that the angle between the arrangement direction of the fiber pieces and the extending direction of the linear portion adjacent to the fiber pieces is within ± 20 °. According to this, since the minute convex portions are in the form of fibers, the wood texture of the key can be further improved. Moreover, the wood texture can be further improved by aligning the arrangement direction of the fiber pieces and the extending direction of the linear portions.

また、本発明の他の特徴は、線状部の延設方向は、鍵の長手方向であり、鍵を成形するための成形型のキャビティ内に前記樹脂材料を注入する注入口であるゲート（２８）を鍵の長手方向の一端側に配置したことにある。これによれば、キャビティ内において、繊維片が添加された樹脂材料の流動方向が線状部の延設方向（すなわち、鍵の長手方向）と一致するので、繊維片の配向制御をすることなく、繊維片の配列方向と線状部の延設方向を揃えることができる。 Another feature of the present invention is that the extending direction of the linear portion is the longitudinal direction of the key, and a gate that is an injection port for injecting the resin material into a cavity of a molding die for molding the key ( 28) is arranged on one end side in the longitudinal direction of the key. According to this, in the cavity, the flow direction of the resin material to which the fiber piece is added coincides with the extending direction of the linear portion (that is, the longitudinal direction of the key), so that the orientation of the fiber piece is not controlled. The arrangement direction of the fiber pieces and the extending direction of the linear portions can be aligned.

本発明の一実施形態に係る白鍵を斜め前方かつ上方から見た斜視図である。It is the perspective view which looked at the white key which concerns on one Embodiment of this invention from diagonally forward and upper direction. 図１Ａの白鍵を斜め後方かつ上方から見た斜視図である。It is the perspective view which looked at the white key of FIG. 1A from diagonally backward and upper direction. 図１Ａ及び図１Ｂの白鍵の線状部の延設方向に垂直な断面を示す断面図である。It is sectional drawing which shows a cross section perpendicular | vertical to the extending direction of the linear part of the white key of FIG. 1A and 1B. 図２のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 図２及び図３の微小凸部及び微小凹部を拡大した拡大図である。It is the enlarged view to which the micro convex part and micro recessed part of FIG.2 and FIG.3 were expanded. 微小凸部同士の間隔及び微小凸部と微小凹部との間の高低差と、極小凸部の間隔及び突出高さとの関係を示す説明図である。It is explanatory drawing which shows the relationship between the space | interval of minute convex parts, the height difference between a minute convex part, and a minute recessed part, and the space | interval and protrusion height of a minimal convex part. 本発明の変形例に係り、側面部の拡大図である。It is an enlarged view of a side part concerning a modification of the present invention. 本発明の変形例に係り、上面部の拡大図である。It is an enlarged view of an upper surface part concerning the modification of this invention. 本発明の他の変形例に係り、微小凸部及び微小凹部を拡大した拡大図である。It is the enlarged view which concerns on the other modification of this invention and expanded the micro convex part and the micro recessed part. 本発明の他の変形例に係り、線状部の延設方向と繊維状材料の配列方向との間の角度を示す説明図である。It is explanatory drawing which concerns on the other modification of this invention and shows the angle between the extending direction of a linear part, and the arrangement direction of a fibrous material. 本発明の変形例に係り、ゲートの位置を示す説明図である。It is explanatory drawing which concerns on the modification of this invention and shows the position of a gate.

以下、本発明の一実施形態に係る電子楽器の白鍵１０について説明する。図１Ａ及び図１Ｂに示す白鍵１０は、電子楽器の鍵盤装置を構成する部材であり、演奏者によって押鍵されて、演奏情報を入力するための部材である。以下の説明においては、白鍵１０が鍵盤装置のフレームに組み付けられたとき、演奏者側から見て低音部側を左側とし、高音部側を右側とする。また、演奏者の手前側を前側とし、奥側を後側とする。白鍵１０は、硬質の合成樹脂による一体成型により、下方に開放された箱状に形成される。ただし、白鍵１０は、下方に開放されていなくてもよい。すなわち、中実であってもよい。 Hereinafter, the white key 10 of the electronic musical instrument which concerns on one Embodiment of this invention is demonstrated. A white key 10 shown in FIGS. 1A and 1B is a member constituting a keyboard device of an electronic musical instrument, and is a member for inputting performance information when pressed by a performer. In the following description, when the white key 10 is assembled to the frame of the keyboard device, the bass part side is the left side and the treble part side is the right side when viewed from the performer side. Also, the front side of the performer is the front side, and the back side is the rear side. The white key 10 is formed in a box shape opened downward by integral molding with a hard synthetic resin. However, the white key 10 does not have to be opened downward. That is, it may be solid.

白鍵１０の後端部には、前部側よりも低くなった段部１０ａが形成されている。白鍵１０は、この段部１０ａにて、鍵盤装置のフレームに揺動可能に支持される。また、白鍵１０の左側後部側には、黒鍵を配置するための切り欠き部１０ｂが形成されている。なお、図１Ａ及び図１Ｂに示す例においては、切り欠き部１０ｂは、鍵の左側に設けられているが、白鍵１０は、音名（Ｃ，Ｄ，Ｅ，Ｆ，Ｇ，Ａ及びＢ）ごとに切り欠き部１０ｂが設けられる位置が異なる。すなわち、切り欠き部１０ｂが鍵の右側又は左右両側に設けられる鍵もある。鍵盤装置において黒鍵に隣接しない白鍵１０には、切り欠き部１０ｂが設けられていない。また、白鍵１０の前端部には、上端部の薄い部分が僅かに前方に突出した突出部１０ｃが形成されている。この突出部１０ｃは、外観を良好にするために設けられているものである。 A step portion 10 a that is lower than the front side is formed at the rear end portion of the white key 10. The white key 10 is swingably supported by the frame of the keyboard device at the step portion 10a. Further, a cutout portion 10b for arranging a black key is formed on the left rear side of the white key 10. In the example shown in FIGS. 1A and 1B, the notch portion 10b is provided on the left side of the key, but the white key 10 has the pitch names (C, D, E, F, G, A, and B). ), The position where the notch 10b is provided is different. That is, there is a key in which the notch 10b is provided on the right side or both the left and right sides of the key. The white key 10 that is not adjacent to the black key in the keyboard device is not provided with the notch 10b. Further, the front end portion of the white key 10 is formed with a protruding portion 10c in which a thin portion of the upper end portion protrudes slightly forward. This protrusion 10c is provided to improve the appearance.

白鍵１０の上面部１１は、第１上面部１１ａ及び第２上面部１１ｂから構成されている。第１上面部１１ａ及び第２上面部１１ｂは、それぞれ左右方向よりも前後方向の方が長い板状に形成されている。第１上面部１１ａの左側後部は、切り欠き部１０ｂを形成するために切り欠かれている。第２上面部１１ｂは、第１上面部１１ａの後側に位置し、第１上面部１１ａよりも低くなっている。すなわち、第２上面部１１ｂが、段部１０ａの上面部に相当する。また、白鍵１０の後面部１２は、第１後面部１２ａ、第２後面部１２ｂ及び第３後面部１２ｃから構成されている。第１上面部１１ａの後端と第２上面部１１ｂの前端は、左右方向かつ上下方向に延設された板状の第１後面部１２ａによって連結されている。 The upper surface portion 11 of the white key 10 includes a first upper surface portion 11a and a second upper surface portion 11b. The first upper surface portion 11a and the second upper surface portion 11b are each formed in a plate shape that is longer in the front-rear direction than in the left-right direction. The left rear portion of the first upper surface portion 11a is cut out to form a cutout portion 10b. The second upper surface portion 11b is located on the rear side of the first upper surface portion 11a and is lower than the first upper surface portion 11a. That is, the second upper surface portion 11b corresponds to the upper surface portion of the step portion 10a. Further, the rear surface portion 12 of the white key 10 includes a first rear surface portion 12a, a second rear surface portion 12b, and a third rear surface portion 12c. The rear end of the first upper surface portion 11a and the front end of the second upper surface portion 11b are connected by a plate-shaped first rear surface portion 12a extending in the left-right direction and the vertical direction.

また、白鍵１０の左側面部１３は、第１左側面部１３ａ及び第２左側面部１３ｂから構成されている。第１左側面部１３ａ及び第２左側面部１３ｂは、それぞれ上下方向よりも前後方向の方が長い板状に形成されている。第１左側面部１３ａは、切り欠き部１０ｂより前方の部分の側面部であり、第２左側面部１３ｂは、切り欠き部１０ｂの側面部である。第１左側面部１３ａの後端と第２左側面部１３ｂの前端は、上下方向かつ左右方向に延設された板状の第２後面部１２ｂによって連結されている。すなわち、第２後面部１２ｂが、切り欠き部１０ｂの前面部に相当する。 Further, the left side surface portion 13 of the white key 10 includes a first left side surface portion 13a and a second left side surface portion 13b. The first left side surface portion 13a and the second left side surface portion 13b are each formed in a plate shape that is longer in the front-rear direction than in the vertical direction. The first left side surface portion 13a is a side surface portion in front of the notch portion 10b, and the second left side surface portion 13b is a side surface portion of the notch portion 10b. The rear end of the first left side surface portion 13a and the front end of the second left side surface portion 13b are connected by a plate-like second rear surface portion 12b extending in the vertical direction and the horizontal direction. That is, the second rear surface portion 12b corresponds to the front surface portion of the notch portion 10b.

また、白鍵１０の右側面部１４は、上下方向よりも前後方向の方が長い板状に形成されている。第２左側面部１３ｂ及び右側面部１４の後部の上端部は、段部１０ａを形成するために切り欠かれている。そして、第２上面部１１ｂ、左側面部１３及び右側面部１４の後端は、左右方向かつ上下方向に延設された板状の第３後面部１２ｃによって連結されている。また、第１左側面部１３ａと右側面部１４の前端の上端部は僅かに前方に突出していて、突出部１０ｃの側面部を構成している。また、白鍵１０の前面部１５は、第１前面部１５ａ及び第２前面部１５ｂからなる。第１上面部１１ａの前端並びに第１左側面部１３ａ及び右側面部１４の前端の上端部（すなわち、僅かに前方に突出した部分）は、左右方向かつ上下方向に延設された板状の第１前面部１５ａによって連結されている。また、第１左側面部１３ａ及び右側面部１４の前端の下部（すなわち、前方に突出した部分以外の部分）は、左右方向かつ上下方向に延設された板状の第２前面部１５ｂによって連結されている。第１前面部１５ａの下端と第２前面部１５ｂの上端は、左右方向かつ水平方向に延設された板状の下面部１６によって連結されている。 Further, the right side surface portion 14 of the white key 10 is formed in a plate shape whose longitudinal direction is longer than the vertical direction. The upper ends of the rear portions of the second left side surface portion 13b and the right side surface portion 14 are notched to form a stepped portion 10a. The rear ends of the second upper surface portion 11b, the left side surface portion 13, and the right side surface portion 14 are connected by a plate-shaped third rear surface portion 12c extending in the left-right direction and the vertical direction. Moreover, the upper end part of the front end of the 1st left side surface part 13a and the right side surface part 14 protrudes slightly forward, and comprises the side part of the protrusion part 10c. Further, the front surface portion 15 of the white key 10 includes a first front surface portion 15a and a second front surface portion 15b. The front end of the first upper surface portion 11a and the upper end portions of the front ends of the first left side surface portion 13a and the right side surface portion 14 (that is, the portion slightly protruding forward) are plate-like first extending in the left-right direction and the up-down direction. It is connected by the front part 15a. Further, lower portions of the front ends of the first left side surface portion 13a and the right side surface portion 14 (that is, portions other than the portion protruding forward) are connected by a plate-like second front surface portion 15b extending in the left-right direction and the vertical direction. ing. The lower end of the first front surface portion 15a and the upper end of the second front surface portion 15b are connected by a plate-like lower surface portion 16 extending in the left-right direction and the horizontal direction.

第１上面部１１ａには、前後方向に延びる凸状の複数の線状部２１が左右方向に間隔を保って配置されている。第１左側面部１３ａ、第２左側面部１３ｂ及び右側面部１４の表面には、第１上面部１１ａと同様の線状部２１が上下方向に間隔を保って配置されている。線状部２１の延設方向に垂直な断面形状は、上端が曲線状になっている。ただし、線状部２１の断面形状は、これに限られず、例えば、矩形であってもよいし、先端が尖っていてもよい。これにより、第１上面部１１ａ、第１左側面部１３ａ、第２左側面部１３ｂ及び右側面部１４の表面に、凹凸のある柾目模様が形成されている。なお、図１Ａ及び図１Ｂ並びに後述する図９及び図１０においては、線状部２１の頂点（すなわち、尾根部）を実線で示している。また、第１後面部１２ａ、第２後面部１２ｂ、第３後面部１２ｃ、第１前面部１５ａ、第２前面部１５ｂ及び下面部１６の表面には、凹凸による模様は形成されていない。ただし、第１後面部１２ａ、第２後面部１２ｂ、第３後面部１２ｃ、第１前面部１５ａ、第２前面部１５ｂ及び下面部１６の表面にも、線状部２１を設けて、模様を形成してもよい。 On the first upper surface portion 11a, a plurality of convex linear portions 21 extending in the front-rear direction are arranged at intervals in the left-right direction. On the surfaces of the first left side surface portion 13a, the second left side surface portion 13b, and the right side surface portion 14, linear portions 21 similar to the first upper surface portion 11a are arranged at intervals in the vertical direction. The cross-sectional shape perpendicular to the extending direction of the linear portion 21 has a curved upper end. However, the cross-sectional shape of the linear portion 21 is not limited to this, and may be, for example, a rectangle or a sharp tip. As a result, an uneven grid pattern is formed on the surfaces of the first upper surface portion 11a, the first left side surface portion 13a, the second left side surface portion 13b, and the right side surface portion 14. In FIGS. 1A and 1B and FIGS. 9 and 10 to be described later, the vertex (that is, the ridge portion) of the linear portion 21 is indicated by a solid line. Moreover, the uneven | corrugated pattern is not formed in the surface of the 1st rear surface part 12a, the 2nd rear surface part 12b, the 3rd rear surface part 12c, the 1st front surface part 15a, the 2nd front surface part 15b, and the lower surface part 16. However, the linear portions 21 are also provided on the surfaces of the first rear surface portion 12a, the second rear surface portion 12b, the third rear surface portion 12c, the first front surface portion 15a, the second front surface portion 15b, and the lower surface portion 16 to form a pattern. It may be formed.

第１上面部１１ａに形成されていて、端部が第１上面部１１ａの右側の縁部に到達している１つの線状部２１は、右側面部１４に形成されていて、端部が右側面部１４の上側の縁部に到達している線状部２１のうちの１つの線状部２１に、第１上面部１１ａと右側面部１４とが交わる縁部にて繋がっている。また、第１上面部１１ａに形成されていて、端部が第１上面部１１ａの左側の縁部かつ第１左側面部１３ａの上側の縁部に到達している１つの線状部２１は、第１左側面部に形成されていて、端部が第１左側面部１３ａの上側の縁部に到達している線状部２１のうちの１つの線状部２１に、第１上面部１１ａと第１左側面部１３ａが交わる縁部にて繋がっている。また、第１上面部１１ａに形成されていて、端部が第１上面部１１ａの左側の縁部かつ第２左側面部１３ｂの上側の縁部に到達している１つの線状部２１は、第２左側面部１３ｂに形成されていて、端部が第２左側面部１３ｂの上側の縁部に到達している線状部２１のうちの１つの線状部２１に、第１上面部１１ａと第２左側面部１３ｂが交わる縁部にて繋がっている。 One linear portion 21 formed on the first upper surface portion 11a and having an end portion reaching the right edge portion of the first upper surface portion 11a is formed on the right side surface portion 14, and the end portion is on the right side. The first upper surface portion 11a and the right side surface portion 14 are connected to one linear portion 21 of the linear portions 21 reaching the upper edge portion of the surface portion 14 at the edge portion. Further, one linear portion 21 that is formed on the first upper surface portion 11a and whose end portion reaches the left edge portion of the first upper surface portion 11a and the upper edge portion of the first left side surface portion 13a, The first upper surface portion 11a and the first upper surface portion 11a are formed on one linear portion 21 of the linear portions 21 that are formed on the first left side surface portion and whose end portions reach the upper edge of the first left side surface portion 13a. 1 It is connected at the edge where the left side 13a intersects. Further, one linear portion 21 formed on the first upper surface portion 11a and having an end portion reaching the left edge portion of the first upper surface portion 11a and the upper edge portion of the second left side surface portion 13b, The first upper surface portion 11a is formed on one linear portion 21 of the linear portions 21 formed on the second left side surface portion 13b and having an end portion reaching the upper edge of the second left side surface portion 13b. The second left side 13b is connected at the edge where it intersects.

また、上面部１１ａ、第１左側面部１３ａ、第２左側面部１３ｂ及び右側面部１４には、複数の微小凸部２２及び微小凹部２３が形成されている。微小凸部２２及び微小凹部２３は、先端が曲面になった円錐状に形成されている。すなわち、図２及び図３に示すように、上面部１１ａ、第１左側面部１３ａ、第２左側面部１３ｂ及び右側面部１４の表面は、微小凸部２２及び微小凹部２３によって、波状のうねりが形成されている。なお、図２及び図３においては、説明をわかりやすくするため、線状部２１に対して、微小凸部２２及び微小凹部２３を拡大して記載している。線状部２１、微小凸部２２及び微小凹部２３の具体的な大きさについては後述する。線状部２１、微小凸部２２及び微小凹部２３は、射出成形によって、白鍵１０の外形と一体的に形成される。 A plurality of minute convex portions 22 and minute concave portions 23 are formed on the upper surface portion 11a, the first left side surface portion 13a, the second left side surface portion 13b, and the right side surface portion 14. The minute convex portion 22 and the minute concave portion 23 are formed in a conical shape having a curved tip. That is, as shown in FIGS. 2 and 3, the surface of the upper surface portion 11 a, the first left side surface portion 13 a, the second left side surface portion 13 b, and the right side surface portion 14 is formed with wavy undulations by the minute convex portions 22 and the minute concave portions 23. Has been. In FIGS. 2 and 3, the minute convex portions 22 and the minute concave portions 23 are illustrated in an enlarged manner with respect to the linear portion 21 for easy understanding. Specific sizes of the linear portion 21, the minute convex portion 22, and the minute concave portion 23 will be described later. The linear portion 21, the minute convex portion 22, and the minute concave portion 23 are integrally formed with the outer shape of the white key 10 by injection molding.

さらに、微小凸部２２及び微小凹部２３の表面には、複数の極小凸部２４が形成されている。白鍵１０の成形に用いる樹脂材料には、直径の小さな球形の粒子状材料２５（例えば、炭素、シリコン、炭酸カルシウムなど）が添加されている。図４に示すように、この粒子状材料２５の一部が微小凸部２２及び微小凹部２３の表面から突出することにより、微小凸部２２及び微小凹部２３の表面に複数の極小凸部２４が形成されている。なお、線状部２１、微小凸部２２及び微小凹部２３が形成されていない第１後面部１２ａ、第２後面部１２ｂ、第３後面部１２ｃ、第１前面部１５ａ、第２前面部１５ｂ及び下面部１６の表面にも、極小凸部２４が形成されている。 Furthermore, a plurality of minimal convex portions 24 are formed on the surfaces of the minute convex portions 22 and the minute concave portions 23. A spherical particulate material 25 (for example, carbon, silicon, calcium carbonate, etc.) having a small diameter is added to the resin material used for molding the white key 10. As shown in FIG. 4, a part of the particulate material 25 protrudes from the surfaces of the minute protrusions 22 and the minute recesses 23, so that a plurality of minimal protrusions 24 are formed on the surfaces of the minute protrusions 22 and the minute recesses 23. Is formed. The first rear surface portion 12a, the second rear surface portion 12b, the third rear surface portion 12c, the first front surface portion 15a, the second front surface portion 15b, in which the linear portion 21, the minute convex portion 22, and the minute concave portion 23 are not formed. Minimal convex portions 24 are also formed on the surface of the lower surface portion 16.

また、隣り合う線状部２１の間隔Ｗ１は、０．０３ｍｍ〜２２ｍｍ、望ましくは０．０５ｍｍ〜１２ｍｍ、さらに望ましくは０．０８ｍｍ〜８ｍｍに設定されている。線状部の突出高さＨ１は、０．０１ｍｍ〜１ｍｍ、望ましくは０．０２ｍｍ〜０．５ｍｍ、さらに望ましくは０．０５ｍｍ〜０．３ｍｍに設定されている。また、隣り合う微小凸部２２（又は隣り合う微小凹部２３）の間隔Ｗ２は、０．０３ｍｍ〜１１ｍｍ、望ましくは０．０５ｍｍ〜６ｍｍ、さらに望ましくは０．０８ｍｍ〜４ｍｍに設定されている。また、微小凸部２２と微小凹部２３の間の高低差は、０．０１ｍｍ〜０．５ｍｍ、望ましくは０．０２ｍｍ〜０．２５ｍｍに設定され、さらに望ましくは０．０５ｍｍ〜０．１５ｍｍに設定されている。また、粒子状材料２５の直径は、０．００１ｍｍ〜０．５ｍｍ、望ましくは０．００２ｍｍ〜０．３ｍｍ、さらに望ましくは０．００５ｍｍ〜０．１ｍｍに設定されている。樹脂材料と粒子状材料２５との混合比、成型条件などを調整して、粒子状材料２５の突出高さＨ３が、０．００２ｍｍ〜０．１ｍｍ、望ましくは０．００４ｍｍ〜０．０５ｍｍ、さらに望ましくは０．０１ｍｍ〜０．０３ｍｍになるようにしている。また、樹脂材料と粒子状材料２５との混合比、成型条件などを調整して、粒子状材料２５の間隔Ｗ３が、０．００６ｍｍ〜２．２ｍｍ、望ましくは０．０１ｍｍ〜１．２ｍｍ、さらに望ましくは０．０１６ｍｍ〜０．８ｍｍになるようにしている。すなわち、図５に示すように、粒子状材料２５の間隔Ｗ３は、隣り合う微小凸部２２（又は、隣り合う微小凹部２３）の間隔Ｗ２の２０％以下に設定され、粒子状材料２５の突出高さＨ３は、微小凸部２２と微小凹部２３の間の高低差Ｈ３の２０％以下に設定されている。この２０％以下の数値は、実験結果に基づくものであり、種々の実験を行った結果、粒子状材料２５の間隔Ｗ３を、隣り合う微小凸部２２（又は、隣り合う微小凹部２３）の間隔Ｗ２の２０％以下に設定し、粒子状材料２５の突出高さＨ３を、微小凸部２２と微小凹部２３の間の高低差Ｈ３の２０％以下に設定した場合に、より好適な鍵が得られた。なお、粒子状材料２５の間隔Ｗ３は、隣り合う微小凸部２２と微小凹部２３の間隔を基準として決定してもよい。粒子状材料２５の突出高さＨ３は、微小凸部２２及び微小凹部２３が設けられていない状態における各面部の表面（基準面）に対する微小凸部２２の突出高さ又は微小凹部２３の深さを基準として決定してもよい。 The interval W1 between the adjacent linear portions 21 is set to 0.03 mm to 22 mm, desirably 0.05 mm to 12 mm, and more desirably 0.08 mm to 8 mm. The protruding height H1 of the linear portion is set to 0.01 mm to 1 mm, desirably 0.02 mm to 0.5 mm, and more desirably 0.05 mm to 0.3 mm. The interval W2 between the adjacent minute convex portions 22 (or adjacent minute concave portions 23) is set to 0.03 mm to 11 mm, desirably 0.05 mm to 6 mm, and more desirably 0.08 mm to 4 mm. Further, the height difference between the minute convex portion 22 and the minute concave portion 23 is set to 0.01 mm to 0.5 mm, desirably 0.02 mm to 0.25 mm, and more desirably 0.05 mm to 0.15 mm. Has been. The diameter of the particulate material 25 is set to 0.001 mm to 0.5 mm, desirably 0.002 mm to 0.3 mm, and more desirably 0.005 mm to 0.1 mm. By adjusting the mixing ratio of the resin material and the particulate material 25, molding conditions, etc., the protruding height H3 of the particulate material 25 is 0.002 mm to 0.1 mm, desirably 0.004 mm to 0.05 mm, Desirably, the thickness is set to 0.01 mm to 0.03 mm. Further, the mixing ratio of the resin material and the particulate material 25, molding conditions, etc. are adjusted so that the interval W3 of the particulate material 25 is 0.006 mm to 2.2 mm, preferably 0.01 mm to 1.2 mm. Desirably, the thickness is 0.016 mm to 0.8 mm. That is, as shown in FIG. 5, the interval W3 between the particulate materials 25 is set to 20% or less of the interval W2 between the adjacent minute convex portions 22 (or adjacent minute concave portions 23), and the protrusion of the particulate material 25 The height H3 is set to 20% or less of the height difference H3 between the minute convex portion 22 and the minute concave portion 23. The numerical value of 20% or less is based on experimental results. As a result of various experiments, the interval W3 between the particulate materials 25 is set to the interval between adjacent minute convex portions 22 (or adjacent minute concave portions 23). A more suitable key is obtained when the projection height H3 of the particulate material 25 is set to 20% or less of the height difference H3 between the minute convex portion 22 and the minute concave portion 23. It was. The interval W3 between the particulate materials 25 may be determined based on the interval between the adjacent minute protrusions 22 and minute recesses 23. The protrusion height H3 of the particulate material 25 is the protrusion height of the minute protrusions 22 or the depth of the minute recesses 23 with respect to the surface (reference surface) of each surface part in a state where the minute protrusions 22 and the minute recesses 23 are not provided. May be determined based on the above.

つぎに、白鍵１０を一体成型する射出成形機について説明する。白鍵１０を一体成形する射出成形機には、固定型と可動型からなる金型が備わっている。上記のように、白鍵１０は下方に開放された箱状に形成される。そのため、白鍵１０の上下方向が金型の型開閉方向となるように、固定型と可動型が設計されている。すなわち、固定型には、白鍵１０の表面側を成形するための凹部がそれぞれ設けられていて、可動型には、白鍵１０の内面側を成形するための凸部がそれぞれ設けられている。この固定型の凹部であって、白鍵１０の第１上面部１１ａ、第１左側面部１３ａ、第２左側面部１３ｂ及び右側面部１４の表面を成形するための成形面には、線状部２１、微小凸部２２及び微小凹部２３を形成するための凹凸がそれぞれ設けられている。 Next, an injection molding machine that integrally molds the white key 10 will be described. An injection molding machine that integrally molds the white key 10 includes a mold including a fixed mold and a movable mold. As described above, the white key 10 is formed in a box shape opened downward. Therefore, the fixed mold and the movable mold are designed so that the vertical direction of the white key 10 is the mold opening / closing direction of the mold. That is, the fixed mold is provided with a recess for molding the front side of the white key 10, and the movable mold is provided with a projection for molding the inner side of the white key 10. . A linear portion 21 is formed on the molding surface for molding the surface of the first upper surface portion 11a, the first left side surface portion 13a, the second left side surface portion 13b and the right side surface portion 14 of the white key 10. Concavities and convexities for forming the minute convex portions 22 and the minute concave portions 23 are respectively provided.

上記のように構成した白鍵１０においては、第１上面部１１ａ、第１左側面部１３ａ、第２左側面部１３ｂ及び右側面部１４の表面に凸状の線状部２１を設け、それぞれの面が交わる縁部でそれらの線状部２１が繋がるようにしたので、線状部２１によって形成される陰影により視覚的に柾目模様を認識できるだけでなく、凹凸により触覚的にも柾目模様を認識できる。また、線状部２１を射出成形によって一体的に形成するようにしたので、上記従来の電子楽器の鍵のような、模様を形成するための仕上げ工程が不要となり、常に一定の模様を簡単に形成できる。また、射出成形により微小凸部２２及び微小凹部２３を一体的に設けたので、木の切断面の組織の大まかな形状を簡単に形成でき、木質感を向上させることができる。さらに、白鍵１０を成形するための樹脂材料に粒子状材料２５を添加して、白鍵１０の表面から粒子状材料２５の一部を突出させることにより、極小凸部２４を形成した。これにより、成形型による転写では不可能な、木の切断面における組織の微細な形状を模擬することができ、木質感をさらに向上させることができる。 In the white key 10 configured as described above, convex linear portions 21 are provided on the surfaces of the first upper surface portion 11a, the first left side surface portion 13a, the second left side surface portion 13b, and the right side surface portion 14, and the respective surfaces are provided. Since the linear portions 21 are connected to each other at the intersecting edge portions, not only can the grid pattern be visually recognized by the shadow formed by the linear portions 21, but also the grid pattern can be recognized tactilely by the unevenness. In addition, since the linear portion 21 is integrally formed by injection molding, a finishing process for forming a pattern, such as the key of the above-described conventional electronic musical instrument, is not required, and a constant pattern can be easily obtained at any time. Can be formed. Moreover, since the minute convex portions 22 and the minute concave portions 23 are integrally provided by injection molding, a rough shape of the tissue of the cut surface of the tree can be easily formed, and the wood texture can be improved. Furthermore, the particulate material 25 was added to the resin material for molding the white key 10, and a part of the particulate material 25 was protruded from the surface of the white key 10, thereby forming the minimal convex portion 24. As a result, it is possible to simulate the fine shape of the tissue on the cut surface of the tree, which is impossible with transfer using a mold, and the wood texture can be further improved.

さらに、本発明の実施にあたっては、上記実施形態に限定されるものではなく、本発明の目的を逸脱しない限りにおいて種々の変更が可能である。 Furthermore, in carrying out the present invention, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention.

上記実施形態においては、線状部２１は、連続的に設けられているが、断続的であってもよい。また、上記実施形態においては、線状部２１を凸状（尾根状）にしたが、凹状（谷溝状）であってもよい。また、上記実施形態においては、線状部２１を前後方向に延設して柾目模様を形成したが、模様は柾目模様に限られない。例えば、湾曲させた複数の線状部２１を前後方向に間隔をおいて設けることにより、板目模様を形成してもよい。また、例えば、線状部２１を環状にして木の節目模様を形成してもよい。 In the said embodiment, although the linear part 21 is provided continuously, you may be intermittent. Moreover, in the said embodiment, although the linear part 21 was made into convex shape (ridge shape), concave shape (valley shape) may be sufficient. Moreover, in the said embodiment, although the linear part 21 was extended in the front-back direction and the grid pattern was formed, a pattern is not restricted to a grid pattern. For example, the grain pattern may be formed by providing a plurality of curved linear portions 21 at intervals in the front-rear direction. Further, for example, the knot pattern of wood may be formed by making the linear portion 21 annular.

また、上記実施形態においては、凸状の線状部２１を設けて装飾模様を形成したが、連続的又は断続的な段差を設けて装飾模様を形成してもよい。例えば、図６に示すように、第１左側面部１３ａ、第２左側面部１３ｂ及び右側面部１４に、上部から下部に向かうに従って、白鍵１０の幅が段階的に広くなるように段差を設け、第１左側面部１３ａ、第２左側面部１３ｂ及び右側面部１４を断崖状に形成し、この段の違いによって表れる前後方向に延びる線を線状部２１Ａとしてもよい。また、上面部１１ａにおいても、図７に示すように、左右方向に階段状の段差を設けて、段の違いによって表れる前後方向に延びる線を線状部２１Ｂとしてもよい。なお、図６及び図７においては、微小凸部２２、微小凹部２３及び極小凸部２４の図示を省略している。また、凸状の線状部、凹状の線状部及び段差による線状部を適宜組み合わせて、装飾模様を形成してもよい。また、上面部１１ａ、第１左側面部１３ａ、第２左側面部１３ｂ及び右側面部１４において、凹凸によって２種類以上の装飾模様を設けてもよく、それらの模様の境界線として認識される線状部も凹凸による装飾模様に含まれる。 Moreover, in the said embodiment, although the convex linear part 21 was provided and the decorative pattern was formed, you may form a decorative pattern by providing a continuous or intermittent level | step difference. For example, as shown in FIG. 6, the first left side surface portion 13a, the second left side surface portion 13b, and the right side surface portion 14 are provided with steps so that the width of the white key 10 gradually increases from the top to the bottom. The first left side surface portion 13a, the second left side surface portion 13b, and the right side surface portion 14 may be formed in a cliff shape, and a line extending in the front-rear direction that appears due to the difference in the steps may be used as the linear portion 21A. Further, as shown in FIG. 7, the upper surface portion 11a may be provided with stepped steps in the left-right direction, and a line extending in the front-rear direction that appears due to the difference in steps may be used as the linear portion 21B. In FIGS. 6 and 7, the illustration of the minute convex portion 22, the minute concave portion 23, and the minimal convex portion 24 is omitted. Further, the decorative pattern may be formed by appropriately combining convex linear portions, concave linear portions, and linear portions due to steps. Moreover, in the upper surface part 11a, the 1st left side part 13a, the 2nd left side part 13b, and the right side part 14, you may provide two or more types of decorative patterns by unevenness, and the linear part recognized as the boundary line of those patterns Is also included in the decorative pattern with irregularities.

また、上記実施形態においては、微小凸部２２及び微小凹部２３は、先端が曲面状の円錐状とした。しかし、この微小凸部２２及び微小凹部２３の形状は、どのような形状であってもよく、例えば、先端が尖った円錐状又は角錐状にしてもよいし、円柱状又は角柱状にしてもよい。また、複数種類の形状の微小凸部２２及び微小凹部２３を混在させてもよい。また、上記実施形態においては、微小凸部２２及び微小凹部２３の両方を設けたがいずれか一方だけでも良い。 Moreover, in the said embodiment, the micro convex part 22 and the micro recessed part 23 were made into the cone shape whose front-end | tip is a curved surface shape. However, the shape of the minute convex portion 22 and the minute concave portion 23 may be any shape, for example, a conical shape or a pyramid shape with a sharp tip, or a cylindrical shape or a prism shape. Good. Moreover, you may mix the micro convex part 22 and the micro recessed part 23 of multiple types of shape. Moreover, in the said embodiment, although both the micro convex part 22 and the micro recessed part 23 were provided, either one may be sufficient.

また、上記実施形態においては、白鍵１０を成形するための樹脂材料に、粒子状材料２５を添加した。これに代えて、繊維状材料２６（例えば、木粉、炭素、セルロースなど）を添加してもよい。この場合も、図８に示すように、繊維状材料２６の一部が白鍵１０の表面から突出することにより、白鍵１０の表面に極小凸部２４が形成される。なお、繊維状材料２６の直径は、０．００１ｍｍ〜０．５ｍｍ、望ましくは０．００２ｍｍ〜０．３ｍｍ、さらに望ましくは０．００５ｍｍ〜０．１ｍｍに設定されている。繊維状材料２６の長さは０．０１ｍｍ〜２ｍｍ、望ましくは０．０２ｍｍ〜１ｍｍ、さらに望ましくは０．０４ｍｍ〜０．５ｍｍに設定されている。また、樹脂材料と繊維状材料２６との混合比、成型条件などを調整して、表面に形成される極小凸部２４の突出高さＨ３及び間隔Ｗ３が、上記実施形態と同等になるようにする。このように構成しても、上記実施形態と同様の効果が得られる。さらに、この場合、図９に示すように、繊維状材料２６の配列方向（又は繊維方向）と、線状部２１の延設方向との間の角度θが±２０°以内になるようにするとよい。この±２０％以内の数値は、実験結果に基づくものであり、角度を変えて種々の実験を行った結果、繊維状材料２６の配列方向（又は繊維方向）と、線状部２１の延設方向との間の角度θを±２０°以内に設定した場合に、より好適な鍵が得られた。なお、図９においては、微小凸部２２及び微小凹部２３の図示を省略している。これによれば、木の組織の配列を模擬することができ、木質感をより向上させることができる。ただし、線状部２１を湾曲させた場合、繊維状材料２６の配向制御が困難になるので、線状部２１を略直線状（例えば、前後方向に直線状）に延設するのが好ましい。そして、線状部２１を前後方向に直線状に延設した場合、図１０に示すように、白鍵１０を成形するための成形型において、繊維状材料２６を添加した樹脂材料をキャビティに注入する注入口であるゲート２８を白鍵１０の前面部側に設けるとよい。これによれば、射出成形における樹脂材料の流動方向が線状部２１の方向（すなわち、前後方向）と一致するので、特別な配向制御をしなくても、繊維状材料２６の配列方向（又は、繊維方向）と線状部２１の延設方向との間の角度θを上記の範囲内に収めることができる。なお、ゲート２８を後面部側に設けてもよい。 In the above embodiment, the particulate material 25 is added to the resin material for molding the white key 10. Instead of this, a fibrous material 26 (for example, wood powder, carbon, cellulose, etc.) may be added. Also in this case, as shown in FIG. 8, a part of the fibrous material 26 protrudes from the surface of the white key 10, thereby forming a minimal convex portion 24 on the surface of the white key 10. The diameter of the fibrous material 26 is set to 0.001 mm to 0.5 mm, desirably 0.002 mm to 0.3 mm, and more desirably 0.005 mm to 0.1 mm. The length of the fibrous material 26 is set to 0.01 mm to 2 mm, desirably 0.02 mm to 1 mm, and more desirably 0.04 mm to 0.5 mm. Further, by adjusting the mixing ratio of the resin material and the fibrous material 26, molding conditions, and the like, the protruding height H3 and the interval W3 of the minimal convex portion 24 formed on the surface are equivalent to those in the above embodiment. To do. Even if comprised in this way, the effect similar to the said embodiment is acquired. Furthermore, in this case, as shown in FIG. 9, the angle θ between the arrangement direction (or fiber direction) of the fibrous material 26 and the extending direction of the linear portion 21 is within ± 20 °. Good. The numerical values within ± 20% are based on the experimental results. As a result of various experiments performed at different angles, the arrangement direction (or fiber direction) of the fibrous material 26 and the extension of the linear portion 21 are obtained. A more suitable key was obtained when the angle θ between the direction and the direction was set within ± 20 °. In addition, in FIG. 9, illustration of the micro convex part 22 and the micro recessed part 23 is abbreviate | omitted. According to this, the arrangement | sequence of the structure | tissue of a tree can be simulated and a wood texture can be improved more. However, since the orientation control of the fibrous material 26 becomes difficult when the linear portion 21 is curved, it is preferable to extend the linear portion 21 in a substantially linear shape (for example, a linear shape in the front-rear direction). When the linear portion 21 is linearly extended in the front-rear direction, as shown in FIG. 10, in the mold for molding the white key 10, the resin material added with the fibrous material 26 is injected into the cavity. It is preferable to provide a gate 28 as an inlet for the white key 10 on the front side. According to this, since the flow direction of the resin material in the injection molding coincides with the direction of the linear portion 21 (that is, the front-rear direction), the arrangement direction of the fibrous material 26 (or even without special orientation control) , The fiber direction) and the extending direction of the linear portion 21 can be within the above range. The gate 28 may be provided on the rear surface side.

また、上記実施形態及びその変形例においては、白鍵１０について説明しているが、黒鍵についても同様に構成することができ、簡単に装飾模様を形成するとともに木質感を向上させることができる。 Moreover, in the said embodiment and its modification, although the white key 10 is demonstrated, it can comprise similarly about a black key, can form a decorative pattern easily and can improve a wood texture. .

また、上記実施形態及びその変形例の白鍵１０の後端部には、段部１０ａが設けられているが、この段部１０ａを設けずに、白鍵１０の上面は、前端から後端にかけて連続した平面状に形成されていてもよい。また、白鍵１０の前端部には、突出部１０ｃが設けられているが、この突出部１０ｃを設けなくてもよい。また、本発明においては、連続した線状になっていなくとも、各面部に形成された模様の模様パターンが急に変化する境界部分も線模様に含まれるものとする。 Further, a step portion 10a is provided at the rear end portion of the white key 10 of the above-described embodiment and its modified example. Without the step portion 10a, the upper surface of the white key 10 extends from the front end to the rear end. It may be formed in a continuous planar shape. Moreover, although the protrusion part 10c is provided in the front-end part of the white key 10, this protrusion part 10c does not need to be provided. Further, in the present invention, even if the line pattern is not continuous, the boundary part where the pattern pattern of the pattern formed on each surface part changes suddenly is also included in the line pattern.

１０…白鍵、１１ａ・・・第１上面部、１１ｂ・・・第２上面部、１２ａ・・・第１後面部、１２ｂ・・・第２後面部、１２ｃ・・・第３後面部、１３ａ・・・第１左側面部、１３ｂ・・・第２左側面部、１４…右側面部、１５ａ・・・第１前面部、１５ｂ・・・第２前面部、２１・・・線状部、２２・・・微小凸部、２３・・・微小凹部、２４・・・極小凸部、２５・・・粒子状材料、２６・・・繊維状材料 DESCRIPTION OF SYMBOLS 10 ... White key, 11a ... 1st upper surface part, 11b ... 2nd upper surface part, 12a ... 1st rear surface part, 12b ... 2nd rear surface part, 12c ... 3rd rear surface part, 13a ... 1st left side surface part, 13b ... 2nd left side surface part, 14 ... Right side surface part, 15a ... 1st front surface part, 15b ... 2nd front surface part, 21 ... Linear part, 22 ... Minute convex part, 23 ... Small concave part, 24 ... Minimal convex part, 25 ... Particulate material, 26 ... Fibrous material

Claims

In the keys of electronic musical instruments with decorative patterns formed by unevenness on the surface,
The decorative pattern is a plurality of linear portions formed of a convex ridge portion or a concave valley groove portion or a stepped step portion whose height is shifted, formed continuously or intermittently at a predetermined interval. Forming,
On the surface on which the decorative pattern is formed, a plurality of minute convex portions or minute concave portions that form a height difference smaller than the height difference of the linear portion are provided,
On the surface on which the decorative pattern is formed, at an interval of 20% or less of the interval between the adjacent minute convex portions or the intervals between the minute concave portions or the minimum interval among the intervals between the adjacent minute convex portions and the minute concave portions. The protruding height from the surface on which the decorative pattern is disposed is 20% or less of the minimum height difference of the height differences formed by one or both of the minute convex portion and the minute concave portion. A key of an electronic musical instrument characterized by providing a plurality of minimal convex portions.

The key of the electronic musical instrument according to claim 1,
The key is integrally formed by injection molding,
The key of an electronic musical instrument, wherein the minimal convex portion is formed of fine particles added to a resin material for forming the key by injection molding.

The key of the electronic musical instrument according to claim 1,
The key is integrally formed by injection molding,
The key of an electronic musical instrument, wherein the minimal convex portion is formed of a fiber piece added to a resin material for forming the key by injection molding.

The key of the electronic musical instrument according to claim 3,
A key for an electronic musical instrument, wherein an angle between an arrangement direction of the fiber pieces and an extending direction of the linear portion adjacent to the fiber pieces is within ± 20 °.

The key of the electronic musical instrument according to claim 4,
The linear portion extends in the longitudinal direction of the key, and a gate serving as an injection port for injecting the resin material into a cavity of a molding die for molding the key is disposed on one end side in the longitudinal direction of the key. Electronic musical instrument key characterized by that.