JP6115697B2 - White key of keyboard instrument and method of manufacturing white key of keyboard instrument - Google Patents

Description

The present invention relates to a white key for a keyboard instrument and a method for manufacturing a white key for a keyboard instrument that is integrally formed of resin using a mold .

  Conventionally, it is well known to integrally mold a white key 10 of a keyboard instrument such as an electronic piano or an electronic organ with a resin using a mold (for example, see Patent Documents 1 to 3 below). As shown in the perspective view of FIG. 9, the white key 10 includes a flat plate-like upper plate portion 11, a flat plate-like front plate portion 12 that extends substantially vertically downward from the front end of the upper plate portion 11, and an upper plate. The plate 11 includes a pair of flat side plate portions 13 and 13 extending vertically downward from the left and right ends of the portion 11, and each plate portion 11, 12, 13, 13 is formed to a predetermined thickness, It has a rectangular space inside. Further, since the white key 10 needs to be disposed between the black key 10 and the instrument when it is assembled to the musical instrument, the front part of the upper plate 11 is formed wide and the rear part is formed narrow. The side plate portions 13 and 13 have corner portions 14 and 14 at the boundary between the wide portion and the narrow portion, respectively. In the present specification, when viewed from a player who plays a keyboard instrument, the front side is referred to as the front, the opposite side is referred to as the rear, and the left and right sides are referred to as the left-right direction.

Japanese Unexamined Patent Publication No. 62-187888 JP 2001-222277 A JP 2009-139467 A

In order to mold this type of white key 10, a mold 20 as shown in FIG. 10 is usually used. FIG. 10 is a cross-sectional view of the mold 20 viewed along a direction corresponding to the direction 10-10 in FIG. The mold 20 has a product upper surface side mold (product exterior side mold) 21 having a rectangular recess 21 a corresponding to the outer surface shape of the white key 10, and a square shape corresponding to the inner surface shape of the white key 10. A product lower surface side mold (product non-appearance side mold) 22 having a convex portion 22a is provided.

  In the mold 20 as described above, since the outer surface of the white key 10 is smooth, the white key 10 is likely to stick to the inner surface side of the concave portion 21a of the product upper surface side mold 21, and the corner portion 14 of the white key 10 is provided. When the white key 10 after molding is taken out by opening the mold 20, the white key 10 is easily pulled by the product upper surface side mold 21. For this reason, when the white key 10 after molding is taken out by opening the mold 20, the white key 10 is deformed, or in some cases, the white key 10 is damaged, resulting in molding problems. There is also a possibility. Further, the inner surface of the concave portion 21a of the product upper surface side mold 21 in contact with the upper plate portion 11 and the side plate portion 13 of the white key 10 is usually subjected to mirror finishing, but a large area of the recessed portion is polished. Therefore, the finishing process of the product upper surface side mold 21 is difficult.

  On the other hand, when the white key 10 is molded only with resin as described above, the outer surface of the upper plate portion 11 and the side plate portion 13 of the white key 10 are processed in the same manner, and the side surface is similar to the white key of an acoustic piano. Since there is no wood portion, it has been considered that the side plate portion 13 of the white key 10 is made of a material different from that of the upper plate portion 11 as shown in FIG. However, the number of parts has increased and the processing has become complicated, making it difficult to adopt it for keyboard products at popular prices.

The present invention has been made to address the above-described problems, and the object thereof is to use a white key of a keyboard instrument that can be manufactured easily and with good quality , and a mold that can easily manufacture a good quality white key. The object is to provide a method for producing a white key for a keyboard instrument . Another object of the present invention is to provide a white key for a keyboard instrument having a wood texture and a method for manufacturing the same. 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 limited to the configuration of the corresponding parts indicated by the reference numerals of this embodiment.

In order to achieve the above object, the structural feature of the present invention is that a white key of a keyboard instrument made of a rectangular resin having an upper plate portion (11), a front plate portion (12) and a side plate portion (13) ( 10)
At least a portion of the outer surface of the side plate portion of the wide portion on the front side of the key, the surface roughness of the part is made rougher than the surface roughness of the upper plate portion, and the position is separated from the upper plate portion by a predetermined distance. The uneven portion (13 A, 13 C, 13 D) is provided.

The white key as described above is usually integrally molded with resin using a mold composed of a product upper surface side mold and a product lower surface side mold. In this case, when removing the molded white key by opening the mold, the concave and convex portions provided on the side plate part act to pull the white key toward the product lower surface side mold side. Even if the white key is provided, it becomes easy to take out the white key from the product upper surface side mold, and the situation where the white key is deformed or damaged can be avoided. In addition, since the lower surface mold of the product molds the lower portion of the white key, the area of the concave portion forming the upper portion of the white key of the upper surface mold of the product is reduced, and the concave portion becomes shallower. Mirror surface processing is facilitated, and the white key molding operation is simplified. In addition, the concave and convex portions provided on the side plate portions can realize an atmosphere in which there is a wood portion on the side surface of the white key while suppressing the manufacturing cost.

Further, in the white key as described above, since the uneven portion is provided at a position away from the upper plate portion by a predetermined distance, it is difficult to see the uneven portion from the player side , which is preferable in appearance. In particular, even when an arc-shaped corner exists at the boundary between the upper plate portion and the side plate portion, the uneven portion becomes difficult to see, which is preferable in terms of appearance.

  Another feature of the present invention resides in that overhang portions (15, 16) projecting left and right are provided on the upper plate portion and the front plate portion in the vicinity of the uneven portion. According to this feature, the projecting portion makes it difficult to see the uneven portion from the player side, which is preferable in terms of appearance.

In addition, another feature of the present invention is that the concavo-convex portion is formed by a texture pattern. According to this feature, a uniform and accurate rough surface can be formed relatively easily as the uneven portion.

Another feature of the present invention is that in the white key (10) of a keyboard instrument made of a rectangular resin having an upper plate portion (11), a front plate portion (12) and a side plate portion (13), the front side of the key. A stepped step portion (13B) is provided on at least a part of the outer surface of the side plate portion of the wide portion so that the plate thickness of the side plate portion decreases as it goes downward from a position away from the upper plate portion by a predetermined distance. It lies in the fact was. In the case of this other feature of the present invention, the step portion acts so as to pull the white key toward the product lower surface side mold side, so that the white key can be easily taken out from the product upper surface side mold, and the white key is deformed. Can be avoided. Also in this case, since the lower surface mold of the product molds the lower part of the white key, the area of the concave portion forming the upper part of the white key of the upper surface mold of the product is reduced, and the concave portion becomes shallow, and the upper surface of the product The side mold can be easily mirror-finished, and the white key molding operation is simplified. Furthermore, since the step portion has an effect of making it look like a grain, in this case as well, it is possible to realize an atmosphere in which the wood portion is on the side surface of the white key while suppressing the manufacturing cost.

Another feature of the present invention is that it is formed in a square shape having an upper plate portion (11), a front plate portion (12), and a side plate portion (13), and a product upper surface side mold (31 , 51 , 61). In the method of manufacturing a white key of a keyboard instrument that is integrally molded with resin using a mold (30 , 50 , 60) comprising a mold and a product lower surface side mold (32 , 52 , 62), the wide portion on the front side of the key The surface roughness of the part of the outer surface of the side plate portion formed by the lower surface mold of the product is made rougher than the surface roughness of the upper plate portion, and is separated from the upper plate portion by a predetermined distance. The uneven portions (13A, 13C, 13D) are formed at the positions. This also makes it possible to avoid the situation where the white key is deformed or broken due to the reason described in the invention of the white key of the keyboard instrument, and simplifies the white key molding operation. Also, an atmosphere in which the manufactured white key has a xylem on the side surface can be realized.

(A) is a schematic side view of the white key which concerns on 1st Embodiment of this invention, (B) is a cross section of the white key which concerns on the said 2nd Embodiment seen along the BB line of (A). FIG. It is sectional drawing of the metal mold | die for manufacturing the white key which concerns on the said 1st Embodiment seen along the direction corresponding to the BB line direction of FIG. (A) is a schematic side view of the white key which concerns on 2nd Embodiment of this invention, (B) is a cross section of the white key which concerns on the said 2nd Embodiment seen along the BB line of (A). FIG. It is sectional drawing of the metal mold | die for manufacturing the white key which concerns on the said 2nd Embodiment seen along the direction corresponding to the BB line direction of FIG. (A) is a schematic side view of the white key which concerns on 3rd Embodiment of this invention, (B) is a cross section of the white key which concerns on the said 3rd Embodiment seen along the BB line of (A). FIG. It is sectional drawing of the metal mold | die for manufacturing the white key which concerns on the said 3rd Embodiment seen along the direction corresponding to the BB line direction of FIG. (A) is a schematic side view of the white key which concerns on 4th Embodiment of this invention, (B) is a cross section of the white key which concerns on the said 4th Embodiment seen along the BB line of (A). It is a figure and (C) is sectional drawing of the white key which concerns on the said 4th Embodiment seen along CC line of (A). It is sectional drawing of the metal mold | die for manufacturing the white key which concerns on the said 4th Embodiment seen along the direction corresponding to the BB line direction of FIG. It is a schematic perspective view of the white key of the keyboard musical instrument which concerns on each conventional and each embodiment of the present invention. It is sectional drawing of the conventional metal mold | die for manufacturing the white key seen along the direction corresponding to the 10-10 line direction of FIG. It is a schematic side view of the white key which shows the other example of the past.

a. First Embodiment Hereinafter, a white key 10 according to a first embodiment of the present invention will be described with reference to the drawings. 1A is a schematic side view of the white key 10 according to the first embodiment, and FIG. 1B is a cross-sectional view of the white key 10 taken along line BB in FIG. 1A. It is. The white key 10 is a white key having a shape including the upper plate portion 11, the front plate portion 12, the side plate portions 13 and 13 and the corner portions 14 and 14 described in the background art section with reference to FIG. Although omitted in the background art section above, the white key 10 is provided at the rear end of the white key 10 and is provided at the rear end of the white key 10. A connecting portion for connecting a plurality of white keys 10, an actuator for driving a key switch provided at the lower end portion of the white key 10, and a swinging operation of the white key 10 provided at the lower end portion of the white key 10. Although a regulation part etc. may be required, since these parts are not directly related to the present invention, illustration is omitted.

  In the side plate portion 13 of the white key 10, the portion corresponding to the wide portion of the front portion of the upper plate portion 11, from a position spaced downward by a predetermined distance from the upper plate portion 11 to the lower end of the side plate portion 13. As shown by the illustrated dot pattern, the uneven portion 13A is provided on the surface of this portion. 13 A of this uneven | corrugated | grooved part is a part whose surface roughness is rough compared with another part, and a simple fine uneven | corrugated pattern may be sufficient, but it is preferable that it is a grain-like pattern.

  Next, the mold 30 for forming the white key 10 according to the first embodiment will be described. FIG. 2 is a cross-sectional view of a mold 30 for molding the white key 10 according to the first embodiment, viewed along a direction corresponding to the BB line direction of FIG. The mold 30 also includes a product upper surface side mold (product exterior side mold) 31 and a product lower surface side mold (product non-appearance side mold) 32. The product upper surface side mold 31 is provided with a recess 31a that forms a rectangular space upward from the lower surface. Due to the space formed between the inner surface of the concave portion 31a and the outer surface of the convex portion 32a provided in the product lower surface side mold 32 and projecting upward in a square shape from the upper surface, the upper portion of the white key 10 ( That is, the upper plate portion 11 of the white key 10 and the upper portions of the front plate portion 12 and the side plate portion 13 of the white key 10 are formed. Further, the outer peripheral surface of the convex portion 32a of the product lower surface side mold 32 is provided with a rectangular concave portion 32b extending downward from the upper surface in a groove shape, and this concave portion 32b allows the lower part of the white key 10 ( That is, the front plate portion 12 and the lower portion of the side plate portion 13 of the white key 10 are formed.

  In the concave portion 32b, the portion corresponding to the concave and convex portion 13A of the side plate portion 13 of the white key 10 is processed so that a texture pattern (concave and convex pattern) is drawn. Thereby, when the white key 10 is resin-molded using the mold 30, the unevenness 13 </ b> A of the side plate portion 13 is formed with unevenness due to the embossing process. The concavo-convex pattern may be a simple concavo-convex pattern, but is preferably a grainy pattern. Further, the upper boundary line of the uneven portion 13A of the side plate portion 13 corresponds to the upper surface of the product lower surface side mold 32, and when the molded white key 10 is taken out from the mold 30, the product upper surface side It matches the parting line of the mold 30 including the mold 31 and the product lower surface side mold 32. Furthermore, when the white key 10 is resin-molded using the mold 30, the inner surface of the mold 30 corresponding to the upper outer surface of the white key 10 and the outer surface of the front plate portion 12, particularly the product upper surface side metal. The inner surface of the recess 31a of the mold 31 is subjected to a mirror finishing process every time the white key 10 is molded in order to improve the appearance of the white key 10 after molding.

  In the white key 10 configured as described above, when the white key 10 formed by opening the mold 30 is taken out, the uneven portion 13A provided on the side plate portion 13 (on the concave portion 32b of the product lower surface side mold 32). The textured pattern provided) acts to pull the white key 10 toward the product lower surface side mold 32 side. Therefore, even if the white key 10 is provided with the corner portion 14, the white key 10 is attached to the product upper surface side metal. It becomes easy to take out from the mold 31, and the situation where the white key 10 is deformed or broken can be avoided. In addition, by providing the product lower surface side mold 32 with the concave portion 32b, the area required for the mirror processing of the concave portion 31a of the product upper surface side mold 31 is reduced, and the depth of the concave portion 31a is also reduced, so that the mirror surface processing can be performed. This makes it easier to form the white key 10.

  Furthermore, in terms of appearance, since the uneven portion 13A is provided on the side plate portion 13 of the white key 10, it is possible to realize an atmosphere in which there is a wood portion on the side surface of the white key 10 while suppressing the manufacturing cost. In particular, the wood texture can be sufficiently achieved by making the pattern of the concavo-convex portion 13A into a wood grain. And since this uneven | corrugated | grooved part 13A is implement | achieved by the embossing process, the uniform and accurate rough surface can be formed comparatively easily in the lower part of the side plate part 13 in the wide part of the white key 10. FIG. Moreover, since the upper end which is a part of the concavo-convex portion 13A is made to correspond to the parting line of the mold 30, portions having different finished surfaces are used as both molds of the product upper surface side mold 31 and the product lower surface side mold 32. In the case where they exist at the same time, the problem that it is difficult to finish the boundary surface is solved, and the labor for manufacturing and processing the mold 30 and the maintenance of the mold 30 can be simplified.

  In the first embodiment, the uneven portion 13A on the surface is provided only at the lower portion of the side plate portion 13 in the wide portion of the white key 10, but the lower portion of the side plate portion 13 in the narrow portion of the white key 10 is provided. Alternatively, an uneven portion (rough surface portion) may be provided. The uneven portion in this case is also formed by embossing, and the upper end of the uneven portion is preferably aligned with the parting line of the mold.

  Further, there is no portion where the width is narrowed at the rear portion of the white key 10, and there is no portion where the width is narrowed on one side wall as between the pitches B-C and the pitch E-C. Even if it does not exist, the same effect is expected in that the molded white key 10 is pulled toward the product lower surface side mold 32 side. Therefore, the uneven portion 13A is also provided on the side plate portion 13 of the white key 10 of that type. Good.

b. Second Embodiment Next, a white key 10 according to a second embodiment of the present invention will be described with reference to the drawings. 3A is a schematic side view of the white key 10 according to the second embodiment, and FIG. 3B is a cross-sectional view of the white key 10 taken along line BB of FIG. 3A. It is. The white key 10 is also a white key having a shape having an upper plate portion 11, a front plate portion 12, side plate portions 13 and 13, and corner portions 14 and 14. Since the white key 10 according to the second embodiment is configured in the same manner as in the first embodiment except for the following features, the same parts are denoted by the same reference numerals as in the first embodiment. A detailed description will be omitted.

  The feature of the white key 10 according to the second embodiment is the side plate portion 13 corresponding to the wide portion of the front portion of the upper plate portion 11, and the side plate from a position separated downward from the upper plate portion 11 by a predetermined distance. A plurality of stepped portions 13B are provided on the surface of the portion up to the lower end of the portion 13. The step portion 13B is formed in a staircase shape so that the plate thickness decreases as it goes below the side plate portion 13, and is extended with a uniform plate thickness for each step in the lateral direction. In FIG. 1B, the step portion 13B is exaggerated, and the height of the step is actually very small (for example, about 0.1 mm). The step portion 13B constitutes the unevenness of the surface of the side plate portion 13, and corresponds to the uneven portion of the present invention.

  Next, the mold 40 for forming the white key 10 according to the second embodiment will be described. FIG. 4 is a cross-sectional view of a mold 40 for molding the white key 10 according to the second embodiment, viewed along a direction corresponding to the BB line direction of FIG. The mold 40 also includes a product upper surface side mold (product exterior side mold) 41 and a product lower surface side mold (product non-appearance side mold) 42. The product upper surface side mold 41 is provided with a recess 41a that forms a rectangular space upward from the lower surface. Due to the space formed between the inner surface of the recess 41a and the upper surface of the product lower surface side mold 42, the upper part of the white key 10 (that is, the upper plate portion 11 of the white key 10 and the front plate of the white key 10). The upper part of the part 12 and the side plate part 13) is molded.

  The product lower surface side mold 42 is provided with a rectangular concave portion 42a extending downwardly from the upper surface in a groove shape, and this concave portion 42a allows the lower portion of the white key 10 (that is, the front plate portion of the white key 10). 12 and the lower part of the side plate part 13). In the concave portion 42a, a step is provided in a vertical direction corresponding to the step portion 13B at a portion corresponding to the step portion 13B of the side plate portion 13 of the white key 10. Further, the upper boundary line of the stepped portion 13B of the side plate portion 13 corresponds to the upper surface of the product lower surface side mold 42, and when the molded white key 10 is taken out from the mold 40, the product upper surface side It matches the parting line of the mold 40 composed of the mold 41 and the product lower surface side mold 42. Also in this case, when the white key 10 is resin-molded using the mold 40, the inner surface of the mold 30 corresponding to the upper outer surface of the white key 10 and the outer surface of the front plate portion 12, particularly The inner surface of the concave portion 41a of the product upper surface side mold 41 is subjected to a mirror finishing process every time the white key 10 is molded in order to improve the appearance of the white key 10 after molding.

  Even in the white key 10 configured as described above, when the white key 10 formed by opening the mold 30 is taken out, the step portion 13B provided on the side plate portion 13 causes the white key 10 to be placed on the product lower surface side mold. Since it acts so as to be pulled toward the 42 side, even if the corner portion 14 is provided on the white key 10, the white key 10 can be easily removed from the product upper surface side mold 41, and the white key 10 is deformed or damaged. You can avoid the situation. Further, by providing the product lower surface side mold 42 with the concave portion 42a, the area required for the mirror processing of the concave portion 41a of the product upper surface side mold 41 is reduced, and the depth of the concave portion 41a is also shallow, so that the mirror surface processing can be performed. This makes it easier to form the white key 10.

  Further, in terms of appearance, a step portion 13B is provided on the side plate portion 13 of the white key 10, and this step portion 13B also has an effect of making it look like a grain of wood. An atmosphere with xylem can also be realized. In addition, since the upper end, which is a part of the stepped portion 13B, is made to correspond to the parting line of the mold 30, parts having different finished surfaces are used as both molds of the product upper surface side mold 41 and the product lower surface side mold 42. In the case where they exist at the same time, it is possible to solve the problem that it is difficult to finish the boundary surface, and it is possible to simplify the manufacturing and processing of the mold 40 and the maintenance of the mold 40.

  In the second embodiment, the step of the step portion 13B is linearly extended in the horizontal direction. However, the step of the step portion 13B is curved and extended in the horizontal direction. May be. According to this, the graininess on the appearance of the side plate portion 13 is further enhanced. Further, in the second embodiment, the convex portion such as the convex portion 32a of the first embodiment is not provided on the upper surface of the product lower surface side mold 42. However, in the second embodiment, the product is not provided. The depth of the concave portion 41 a of the upper surface side mold 41 may be slightly increased, and the convex portion may be provided on the upper surface of the product lower surface side mold 42. According to this, the portion without the step portion 13B in the upper part of the side plate portion 13 is increased, and the step portion 13B is shortened in the vertical direction, but an effect substantially the same as the above effect is expected.

  Furthermore, also in this second embodiment, there is no portion where the width is narrowed at the rear portion of the white key 10, and the portion where the width is narrowed on one side wall as between the pitches B and C and between the pitches E and C. Even if the corner portion 14 is not present, the same effect is expected in that the molded white key 10 is pulled toward the product lower surface side mold 42 side. 13 may be provided with a stepped portion 13B.

c. Third Embodiment Next, a white key 10 according to a third embodiment of the present invention will be described with reference to the drawings. 5A is a schematic side view of the white key 10 according to the third embodiment, and FIG. 5B is a cross-sectional view of the white key 10 taken along line BB in FIG. 5A. It is. The white key 10 is also a white key having a shape having an upper plate portion 11, a front plate portion 12, side plate portions 13 and 13, and corner portions 14 and 14. Since the white key 10 according to the third embodiment is also configured in the same manner as in the first embodiment except for the following features, the same parts are denoted by the same reference numerals as in the first embodiment. A detailed description will be omitted.

  A feature of the white key 10 according to the third embodiment is a side plate portion 13 corresponding to the wide portion of the front portion of the upper plate portion 11, and the side plate from a position separated downward from the upper plate portion 11 by a predetermined distance. The uneven portion 13C is provided on the surface of the portion from the position separated from the front plate portion 12 by a predetermined distance to the lower end of the portion 13 to the corner portion 14 of the side plate portion 13. The concavo-convex portion 13 </ b> C is a simple concavo-convex pattern or grain pattern by embossing as in the first embodiment. In the third embodiment, a corner 15 formed in an arc shape is formed at the boundary between the upper plate 11 and the side plate 13. The corner 15 is a processed shape that is often performed in the white key 10.

  Next, a mold 50 for forming the white key 10 according to the third embodiment will be described. FIG. 6 is a cross-sectional view of a mold 50 for molding the white key 10 according to the third embodiment, viewed along a direction corresponding to the BB line direction of FIG. The mold 50 also includes a product upper surface side mold (product exterior side mold) 51 and a product lower surface side mold (product non-appearance side mold) 52. The product upper surface side mold 51 is provided with a recess 51a that forms a rectangular space upward from the lower surface. Due to the space formed between the inner surface of the recess 51a and the upper surface of the product lower surface side mold 52, the upper portion of the white key 10 (that is, the upper plate portion 11 of the white key 10 and the front plate of the white key 10). The upper part of the part 12 and the side plate part 13) is molded.

  The product lower surface side mold 52 is provided with a rectangular recess 52a extending downward from the upper surface thereof in a groove shape, and the recess 52a allows the lower part of the white key 10 (that is, the front plate portion of the white key 10). 12 and the lower part of the side plate part 13). In the concave portion 42a, the portion corresponding to the concave and convex portion 13C of the side plate portion 13 of the white key 10 is processed so that a texture pattern (concave / convex pattern) is drawn. Further, the upper boundary line of the uneven portion 13 </ b> C of the side plate portion 13 corresponds to the upper surface of the product lower surface side mold 52, and when the white key 10 after molding is taken out from the mold 50, the upper surface side of the product It matches the parting line of the mold 50 including the mold 51 and the product lower surface side mold 52. Also in this case, when the white key 10 is resin-molded using the mold 50, the inner surface of the mold 50 corresponding to the upper outer surface of the white key 10 and the outer surface of the front plate portion 12, particularly The inner surface of the recess 51a of the product upper surface side mold 41 is subjected to a mirror finishing process every time the white key 10 is molded in order to improve the appearance of the white key 10 after molding.

  Also in the white key 10 configured as described above, when the white key 10 formed by opening the mold 50 is taken out, the uneven portion 13C provided on the side plate portion 13 causes the white key 10 to be placed on the product lower surface side mold. 52 acts so that the white key 10 can be easily removed from the product upper surface side mold 51 even if the corner portion 14 is provided on the white key 10, and the white key 10 is deformed or damaged. You can avoid the situation. Also, by providing the product lower surface side mold 52 with the concave portion 52a, the area required for the mirror surface processing of the concave portion 51a of the product upper surface side mold 51 is reduced, and the depth of the concave portion 51a is also reduced, so that the mirror surface processing can be performed. This makes it easier to form the white key 10.

  Furthermore, in terms of appearance, the uneven portion 13C is provided on the side plate portion 13 of the white key 10, and the step portion 13C has an effect of making it look like a grain of wood. An atmosphere with xylem can also be realized. In the third embodiment, the uneven portion 13C is provided on the side plate portion 13 at a predetermined distance from the upper plate portion 11 and the front plate portion 12, so that the uneven portion 13C is difficult to see from the player side. It is preferable in appearance. In particular, even if there is an arcuate corner 15 at the boundary between the upper plate 11 and the side plate 13, the uneven portion 13C is difficult to see, which is preferable in appearance. Also in this case, since the upper end, which is a part of the concavo-convex portion 13C, is made to correspond to the parting line of the mold 50, the parts with different finished surfaces are the product upper surface side mold 51 and the product lower surface side mold 52. When both molds are present at the same time, the problem that it is difficult to finish the boundary surface can be solved, and the labor for manufacturing and processing the mold 50 and the maintenance of the mold 50 can be simplified.

  In the third embodiment, the convex portion such as the convex portion 32a of the first embodiment is not provided on the upper surface of the product lower surface side mold 52. However, in the third embodiment, the product is not provided. The depth of the concave portion 51 a of the upper surface side mold 51 may be slightly increased, and the convex portion may be provided on the upper surface of the product lower surface side mold 52. According to this, the part without the uneven part 13C in the upper part of the side plate part 13 is increased, and the uneven part 13C is shortened in the vertical direction, but an effect similar to the above effect is expected.

  Moreover, in the said 3rd Embodiment, the uneven | corrugated | grooved part 13C shape | molded by the embossing was provided in the side-plate part 13. As shown in FIG. However, instead of this, a stepped portion similar to the stepped portion 13B of the second embodiment may be provided at the position of the uneven portion 13C. Also by this, the same effect as that of the second embodiment is expected, and as described above, the stepped portion becomes difficult to see from the player side, which is preferable in appearance.

  Further, in the third embodiment, there is no portion where the width is narrowed at the rear portion of the white key 10, and the portion where the width is narrowed on one side wall as between the pitches B-C and between the pitches E-C. Even if the corner portion 14 is not present, the same effect is expected in that the molded white key 10 is pulled toward the product lower surface side mold 52 side. 13 may be provided with an uneven portion 13C.

d. Fourth Embodiment Next, a white key 10 according to a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 7A is a schematic side view of the white key 10 according to the fourth embodiment, and FIG. 7B is a cross-sectional view of the white key 10 taken along line BB in FIG. 7A. FIG. 7C is a cross-sectional view of the white key 10 viewed along the line CC in FIG. 7A. Since the white key 10 is obtained by changing the white key 10 according to the third embodiment as follows, the same portions are denoted by the same reference numerals as in the third embodiment, and detailed description will be given. Is omitted.

  In the white key 10 according to the fourth embodiment, the white key 10 according to the third embodiment is located in the left-right direction with respect to the upper plate portion 11 at both the left and right ends of the upper plate portion 11 at a position above the uneven portion 13D. Overhanging portions 16 and 16 are provided. Further, at the front position of the uneven portion 13D, overhang portions 17 and 17 are provided on the front plate portion 12 so as to protrude from the side plate portion 13 in the left and right directions at both left and right ends. The uneven portion 13D is the same as the uneven portion 13C of the second embodiment.

  Next, the metal mold | die 60 for shape | molding the white key 10 which concerns on the said 4th Embodiment is demonstrated. FIG. 8 is a cross-sectional view of a mold 60 for molding the white key 10 according to the fourth embodiment, viewed along a direction corresponding to the direction of the line B-B in FIG. The mold 60 also includes a product upper surface side mold (product appearance side mold) 61 having a recess 61a and a product lower surface side mold (product non-appearance side mold) 62 having a recess 62a. The product upper surface side mold 61 and the product lower surface side mold 62 are shaped to form the overhang portions 16 and 17 of the white key 10 and the mold 50 for molding the white key 10 of the third embodiment. It is only different.

  In the white key 10 configured as described above, the same effect as that of the white key 10 according to the third embodiment can be expected. Further, according to the white key 10 according to the fourth embodiment, since the overhang portions 16 and 17 are provided above and in front of the uneven portion 13D, compared to the case of the third embodiment, the player side Therefore, the uneven portion 13D becomes more difficult to see, which is more preferable in appearance.

  In the fourth embodiment, as in the case of the third embodiment, the depth of the concave portion 51a of the product upper surface side mold 51 is slightly increased, and the convexity is formed on the upper surface of the product lower surface side mold 52. A portion may be provided so that a portion without the uneven portion 13C in the upper portion of the side plate portion 13 may be increased. Further, the side plate of the white key 10 which does not have a portion with a narrow width at the rear portion or has a portion with a narrow width on one side wall as between the pitches B and C and the pitch E and C. The uneven portion 13D may be provided on the portion 13.

  Further, also in the fourth embodiment, the side plate portion 13 is provided with the uneven portion 13 </ b> D formed into a texture. However, instead of this, a stepped portion similar to the stepped portion 13B of the second embodiment may be provided at the position of the uneven portion 13D. Also by this, the same effect as that of the second embodiment is expected, and as described above, the stepped portion becomes difficult to see from the player side, which is preferable in appearance.

  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.

DESCRIPTION OF SYMBOLS 10 ... White key, 11 ... Upper board part, 12 ... Front board part, 13 ... Side board part, 13A, 13C, 13D ... Uneven part, 13B ... Step part, 14 ... Corner part, 16, 17 ... Overhang part, 20, 30, 40, 50, 60 ... mold, 21, 31, 41, 51, 61 ... product upper surface side mold, 22, 32, 42, 52, 62 ... product lower surface side mold

Claims (5)

In the white key of a keyboard instrument made of a square-shaped resin having an upper plate portion, a front plate portion and a side plate portion,
At least a part of the outer surface of the side plate portion of the wide portion on the front side of the key, the partial surface roughness is made rougher than the surface roughness of the upper plate portion, and is separated from the upper plate portion by a predetermined distance. A white key for a keyboard instrument, characterized by an uneven portion at the position . 2. The white key for a keyboard instrument according to claim 1 , wherein overhanging portions are provided on the upper plate portion and the front plate portion so as to protrude from side to side at a position near the uneven portion. The white key of the keyboard instrument according to claim 1, wherein the concavo-convex portion is formed by a texture pattern. In the white key of a keyboard instrument made of a square-shaped resin having an upper plate portion, a front plate portion and a side plate portion,
A stepped stepped portion on at least a part of the outer surface of the wide side plate on the front side of the key so that the thickness of the side plate decreases as it goes downward from a position away from the upper plate by a predetermined distance. A white key for keyboard instruments. In a method of manufacturing a white key for a keyboard instrument, which is formed into a square shape having an upper plate portion, a front plate portion, and a side plate portion, and is integrally molded with a resin using a die made of a product upper surface side die and a product lower surface side die. ,
At least part of the outer surface of the side plate part formed by the product lower surface side mold of the wide part on the front side of the key, the surface roughness of the part is made rougher than the surface roughness of the upper plate part, A method of manufacturing a white key for a keyboard instrument, wherein the uneven portion is formed at a position separated from the upper plate portion by a predetermined distance .

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