Exterior member and electronic musical instrument

Abstract

To provide an exterior member which can easily set a sound emission direction, a forming method of the exterior member and an electronic musical instrument.SOLUTION: A back panel 15 which is an exterior member includes: a frame part 110 having a plurality of sound emission holes 150 including first sound emission holes 160-1 and second sound emission holes 160-2; a first inclined part 160b in which a first inclined face 161a inclined from a thickness direction (Y-axis direction) of the frame part 110 is arranged in the frame part 110 toward a first direction 161c in an area of the first sound emission hole 160-1; and a second inclined part 162b in which a second inclined face 162a inclined from the thickness direction (Y-axis direction) of the frame part 110 is arranged in the frame part 110 toward a second direction 162c different from the first direction 161c in an area of the second sound emission hole 160-2.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an exterior member, a molding method for an exterior member, and an electronic musical instrument. [Background technology]

[0002] Conventionally, exterior members having a plurality of sound emission holes, such as speaker nets, have been used in acoustic devices such as electronic musical instruments and radios. For example, Patent Document 1 discloses a speaker net in which a plurality of circular sound emission holes are arranged in a staggered pattern. The speaker net is attached to a cabinet having sound holes so as to cover the sound holes. A speaker is arranged inside the sound holes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 6-62693 Summary of the Invention [Problem to be solved by the invention]

[0004] The sound emission direction of the sound emitted from the speaker is parallel to the axial direction of the sound hole (i.e., the axial direction of the sound emission hole of the speaker net). For example, in an acoustic device equipped with multiple speakers, it may be desired to set the sound emission direction from each speaker for each speaker, so that the sound emitted from the acoustic device has a wider range. However, when there is not enough space inside the acoustic device, it may be difficult to change and set the orientation of the speaker, sound hole, and speaker net for each speaker.

[0005] An object of the present invention is to provide an exterior member that allows easy setting of the sound emission direction, a method for molding the exterior member, and an electronic musical instrument. [Means for solving the problem]

[0006] The exterior member of the present invention has a frame portion having a plurality of sound emission holes including a first sound emission hole and a second sound emission hole, a first inclined portion arranged on the frame portion within a region of the first sound emission hole, with an inclined surface arranged at an angle from the thickness direction of the frame portion facing a first direction, and a second inclined portion arranged on the frame portion within a region of the second sound emission hole, with an inclined surface arranged at an angle from the thickness direction of the frame portion facing a second direction different from the first direction, wherein the first sound emission hole and the second sound emission hole are arranged in a hexagonal shape, the sound emission holes of the frame portion include rectangular sound emission holes, and within the region of the rectangular sound emission hole, an inclined portion is provided with an inclined surface arranged at an angle from the thickness direction of the frame portion facing a direction different from the first direction and the second direction.

[0007] An electronic musical instrument according to the present invention includes the exterior member described above.

[0008] The method for molding an exterior member according to the present invention includes the steps of: clamping a mold having a cavity mold comprising one side of a hexagonal prism, the hexagonal prism having a pair of inclined surfaces on opposing sides that incline in the same direction, divided between opposing tops, and a core mold comprising the other side; and injecting molten resin into the mold to mold a frame portion formed by the hexagonal prism, the frame portion having a sound emission hole with an inclined surface within the area of ​​the hole. Effect of the Invention

[0009] According to the present invention, it is possible to provide an exterior member that allows easy setting of the sound emission direction, a method for molding an exterior member, and an electronic musical instrument. [Brief description of the drawings]

[0010] [Figure 1] 1 is a perspective view of an electronic keyboard instrument equipped with an exterior member (rear panel) according to an embodiment of the present invention. [Diagram 2] 1 is a rear view of an electronic keyboard instrument equipped with an exterior member (rear panel) according to an embodiment of the present invention. [Diagram 3]1 is an enlarged rear view of an electronic keyboard instrument, illustrating a first sound emitting portion and a second sound emitting portion in an exterior member (rear panel) according to an embodiment of the present invention. [Figure 4] 4 is a cross-sectional view of the exterior member (rear panel) according to the embodiment of the present invention taken along line IV-IV in FIG. 3. [Diagram 5] 5 is a cross-sectional view of the exterior member (rear panel) according to the embodiment of the present invention in FIG. 3 . FIG. [Figure 6] 6 is a cross-sectional view of the exterior member (rear panel) according to the embodiment of the present invention taken along line VI-VI in FIG. 3. [Figure 7] 7A and 7B are enlarged views of a portion of the second sound emitting portion of the exterior member (rear panel) according to the embodiment of the present invention, in which (a) is an enlarged rear view of portion P in FIG. 3, and (b) is a cross-sectional view taken along line VIIb-VIIb in (a). [Figure 8] 8 is a cross-sectional view of the exterior member (rear panel) according to the embodiment of the present invention taken along line VIII-VIII in FIG. 3. [Figure 9] 4 is a perspective view of a second sound emitting portion of the exterior member (rear panel) according to the embodiment of the present invention, as viewed from the inside. FIG. [Figure 10] FIG. 1 is a perspective view showing a first sound emitting section of an exterior member (rear panel) according to an embodiment of the present invention, as viewed from the front side (outside), in which the surface molded by the core mold is shown in white and the surface molded by the cavity mold is shown in shaded form. [Figure 11] FIG. 1 is a perspective view showing a first sound emitting section of an exterior member (rear panel) according to an embodiment of the present invention, as viewed from the front side (outside), in which the surface molded by the core mold is shown in white and the surface molded by the cavity mold is shown in shaded form. [Figure 12] 1A and 1B are diagrams illustrating a mold for molding an exterior member (rear panel) according to an embodiment of the present invention, in which (a) is an enlarged rear view of the front side (outside) of the second sound emission hole of the rear panel, which is the product, and (b) is a cross-sectional view of the mold corresponding to the XIIb-XIIb section of (a). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. An electronic keyboard instrument 10 (electronic instrument) which is an acoustic device shown in Fig. 1 includes a 61-key keyboard 30 and an instrument case 19. An operation unit 31 including an adjustment knob 13 is provided on a top surface 11 of the electronic keyboard instrument 10. As shown in Fig. 2, the instrument case 19 includes a rear panel 15 as an exterior member and a rear cover 12 disposed on the outside of the rear panel 15. A connector panel 18 including an AC adapter connection port, a connection port for another acoustic device, and a USB connection port is provided at the bottom center of the rear panel 15 of the electronic keyboard instrument 10.

[0012] In the following description, the up-down direction of the electronic keyboard instrument 10 is the Z-axis (the bottom side is the positive side of the Z-axis), the left-right direction in which the keys are arranged is the X-axis (the side with higher pitches is the positive side of the X-axis), and the front-to-back direction of the keys is the Y-axis (the front side of the keys is the positive side of the Y-axis).

[0013] The rear panel 15 of the electronic keyboard instrument 10 is provided with two first sound emitting sections 100 and two second sound emitting sections 200 each having a frame section 110, 210 with a plurality of sound emitting holes 150, 250. The first sound emitting sections 100 are arranged in series in a direction (X-axis direction in FIG. 2) perpendicular to the axial direction of the sound emitting holes 150, 250 (Y-axis direction in FIG. 2, i.e., thickness direction of the frame section 110, 210). The two first sound emitting sections 100 are arranged on the outer side of the electronic keyboard instrument 10 in the X-axis direction (opposite the connector panel 18), and the two second sound emitting sections 200 are arranged on the inner side of the electronic keyboard instrument 10 in the X-axis direction (the connector panel 18 side). A pair of the first sound emitting sections 100 and the second sound emitting sections 200 arranged on the left and right of FIG. 2 are arranged symmetrically.

[0014] As shown in FIG. 4, sound emitting devices 20 corresponding to the first sound emitting section 100 and the second sound emitting section 200 are provided on the inner side (positive side in the Y-axis direction) of the rear panel 15. In this embodiment, the sound emitting devices 20 are speakers. The rear panel 15 (first sound emitting section 100, second sound emitting section 200) is disposed adjacent to the sound emitting devices 20. A rear cover 12 is provided on the outer side of the rear panel 15. The rear cover 12 has openings in the portions corresponding to the first sound emitting section 100 and the second sound emitting section 200. Although not shown, a saran net can be provided on the outer surface of the rear cover 12.

[0015] As shown in FIG. 3, the frame portion 110, 210 is provided with an outer edge having a substantially elliptical outer shape with the X-axis direction as the major axis. The frame portion 110, 210 includes a plurality of frames 115, 215. Here, the frame 115, 215 is, for example, one side constituting the hexagonal sound emission hole 150, 250, and the frame portion 110, 210 is made up of a plurality of frames 115, 215. The sound emission hole 150, 250 is provided by an area surrounded by the plurality of frames 115, 215. As shown in FIG. 4, the outer surface (outer surface 110a, 210a) of the frame portion 110, 210 on the negative side in the Y-axis direction is provided flush with the surface.

[0016] The first sound emitting section 100 will be described. As shown in FIG. 3, the sound emitting holes 150 provided in the frame section 110 of the first sound emitting section 100 include a first sound emitting hole 160-1 to a sixth sound emitting hole 160-6, each of which is provided in plurality, and a plurality of identical sound emitting holes 170. The first sound emitting section 100 is provided with a plurality of identical sound emitting holes 170 on the inner side (connector panel 18 side) in a direction (X-axis direction) perpendicular to the thickness direction (Y-axis direction) of the frame section 110. In addition, the frame section 110 of the first sound emitting section 100 is provided with linear frames 120-1 to 120-6 that are long and linear. The linear frames 120-1 to 120-4 are provided parallel to the Z-axis direction and connected to the outer edge of the frame section 110. The linear frames 120-1, 120-2 are arranged at approximately the center of the frame section 110 in the X-axis direction with a predetermined distance between them, with the linear frame 120-1 on the inside and the linear frame 120-2 on the outside.

[0017] The linear frame 120-3 is disposed inside the linear frame 120-1 in the X-axis direction, and the linear frame 120-4 is disposed outside the linear frame 120-2 in the X-axis direction. The linear frames 120-3 and 120-4 are also formed as inclined portions (second inclined portions 162b) at the portions where they overlap with the sides of the hexagonal shape of the second sound emission hole 160-2. The linear frames 120-5 and 120-6 are provided in parallel with the X-axis direction and connected to the outer edge of the frame unit 110. The linear frames 120-5 and 120-6 are provided near the outer edge of the frame unit 110 in the Z-axis direction, with the linear frame 120-5 on the lower side and the linear frame 120-6 on the upper side.

[0018] A plurality of identical sound emission holes 170 having a substantially hexagonal polygonal shape are provided in a substantially honeycomb shape in the frame part 110 between the upper and lower linear frames 120-5 and 120-6 on the inner side in the X-axis direction with respect to the linear frame 120-1 at the center of the frame part 110. As shown in FIG. 4, the identical sound emission holes 170 are provided so that the inner and outer shapes in the axial direction (Y-axis direction) of the sound emission hole 150 are substantially the same. Here, the identical sound emission holes such as the identical sound emission holes 170, 171, and 270 refer to holes having substantially the same inner and outer shapes in the axial direction (Y-axis direction, i.e., thickness direction of the frame part 110) of the sound emission hole 150. The identical sound emission holes 170 connected to the outer edge of the frame part 110 or the linear frames 120-5 and 120-6 are provided by deforming or halving the substantially hexagonal shape.

[0019] On the other hand, on the outer side of the linear frame 120-2 in the X-axis direction and in the frame portion 110 between the linear frames 120-5 and 120-6, a plurality of first sound emission holes 160-1 to third sound emission holes 160-3, each of which is a polygonal, substantially hexagonal hole, are provided in a substantially honeycomb shape. The plurality of first sound emission holes 160-1 to third sound emission holes 160-3 are arranged in three rows, each of which is aligned in the X-axis direction. In FIG. 3, a plurality of first sound emission holes 160-1 are provided in the upper row, a plurality of second sound emission holes 160-2 are arranged in the middle row, and a plurality of third sound emission holes 160-3 are arranged in the lower row. In FIG. 3, the inclined surfaces of the first sound emission holes 160-1 to seventh sound emission holes 160-7 are shown shaded.

[0020] 5 of the first sound emission holes 160-1, the first sound emission holes 160-1 have a first inclined portion 161b having a first inclined surface 161a arranged inclined from the thickness direction of the frame portion 110 in the axial direction of the first sound emission hole 161 (Y-axis direction, i.e., thickness direction of the frame portion 110) in the region of the first sound emission hole 161 (within the region inside the approximately hexagon in plan view in FIG. 3). A first direction 161c, which is the inclination direction of the first inclined surface 161a (a direction perpendicular to the edge line 161a1 of the first inclined surface 161a on the inside of the hole, and a direction from the inside to the outside of the first sound emission hole 161, i.e., the sound emission direction), is a direction that is approximately half an angle between the negative side of the X axis and the negative side of the Z axis.

[0021] 4 as an example, the second sound emission hole 162 has, within the region of the second sound emission hole 162, a second inclined portion 162b having a second inclined surface 162a arranged at an angle from the thickness direction of the frame portion 110 in the axial direction (Y-axis direction) of the second sound emission hole 162. A second direction 162c which is the inclination direction of the second inclined surface 162a is set to the negative side of the X-axis.

[0022] Similarly, the third sound emission hole 160-3 (the third sound emission hole 163) has a third inclined portion 163b having a third inclined surface 163a, and a third direction 163c which is the direction of the third inclined surface 163a is a direction which is approximately a half angle between the negative side of the X-axis and the positive side of the Z-axis. The first direction 161c, the second direction 162c, and the third direction 163c are all different directions.

[0023] On the other hand, on the outer sides of the upper and lower linear frames 120-5 and 120-6, a plurality of rectangular fourth sound emission holes 160-4 and a plurality of rectangular fifth sound emission holes 160-5 are arranged in a line in the X-axis direction. The fourth sound emission hole 160-4 (fourth sound emission hole 164) has a fourth direction 164c on the positive side of the Z axis that faces the fourth inclined surface 164a of the fourth inclined portion 164b. The fifth sound emission hole 160-5 (fifth sound emission hole 165) has a fifth direction 165c on the negative side of the Z axis that faces the fifth inclined surface 165a of the fifth inclined portion 165b. The fourth inclined portion 164b and the fifth inclined portion 165b each have an inclined surface (fourth inclined surface 164a, fifth inclined surface 165a) that is inclined from the thickness direction of the frame portion 110.

[0024] Meanwhile, between the central linear frames 120-1, 120-2 and approximately at the center of the frame part 110 in the Z-axis direction and the X-axis direction, a uniform sound emission hole 172 is provided. On the upper side (negative side) and lower side (positive side) in the Z-axis direction of this uniform sound emission hole 172, a sixth sound emission hole 160-6 and a seventh sound emission hole 160-7 having a substantially elongated rectangular shape that is long in the Z-axis direction are provided.

[0025] As shown in FIG. 6, the sixth inclined surface 166a of the sixth inclined portion 166b of the sixth sound emission hole 160-6 is arranged to be inclined from the thickness direction of the frame portion 110. In other words, the sixth inclined surface 166a is provided so as to expand from the inside to the outside of the frame portion 110. The sixth inclined portion 166b is provided with a bent portion that is bent in the expanding direction. Similarly, the seventh inclined surface 167a of the seventh inclined portion 167b of the seventh sound emission hole 160-7 is provided with the same bent portion as above and arranged to be inclined from the thickness direction of the frame portion 110. The inclination direction of the sixth inclined surface 166a of the sixth sound emission hole 160-6 is the same as the fourth direction 164c. The inclination direction of the seventh inclined surface 167a of the seventh sound emission hole 160-7 is the same as the fifth direction 165c. The inclined portions (sixth inclined portion 166b and seventh inclined portion 167b) having inclined surfaces (sixth inclined surface 166a and seventh inclined surface 167a) are respectively provided between the second hole frames 112 described below. The inclined portions (sixth inclined portion 166b and seventh inclined portion 167b) are provided in a pair such that the inclined surfaces (sixth inclined surface 166a and seventh inclined surface 167a) face each other.

[0026] 3, the sound emission direction from the first sound emission section 100 is set to the upper right direction (first direction 161c) by the first sound emission hole 160-1, to the right direction (second direction 162c) by the second sound emission hole 160-2, to the lower right direction (third direction 163c) by the third sound emission hole 160-3, to the upper direction (fourth direction 164c) by the fourth sound emission hole 160-4 and the sixth sound emission hole 160-6, and to the lower direction (fifth direction 165c) by the fifth sound emission hole 160-5 and the seventh sound emission hole 160-7. Therefore, the first sound emission section 100 can give a spread to the sound it emits.

[0027] Here, attention is paid to the height (length in the thickness direction (Y-axis direction) of the frame part 110) of the plurality of frames 115 constituting the frame part 110 of the first sound emitting part 100. The same-shaped sound emitting holes 171 and 172 shown in FIG. 7(a) and FIG. 7(b) will be described as an example. The plurality of frames 115 constituting the frame part 110 of the first sound emitting part 100 have a first hole frame 111 having a surface on which the sound emitting hole 150 is formed, and a second hole frame 112. As shown in FIG. 7(a), which is an enlarged view of a P part in FIG. 3, the same-shaped sound emitting hole 171 is made up of a hole forming surface 111a provided on each of the six first hole frames 111 (reference symbols a to f). Similarly, the same-shaped sound emitting hole 172 is made up of a hole forming surface 112a provided on each of the six second hole frames 112 (reference symbols g to l). The hole formation surfaces 111a and 112a are side surfaces of the holes along the thickness direction (Y-axis direction) of the frame part 110. Therefore, the length of the formation surface is focused on the thickness direction of the frame part 110 even if the formation surface has a wide shape.

[0028] As shown in FIG. 7(b), the second hole frame 112 has a length T2 of the formation surface 112a of the same-shaped sound emission hole 172 in the Y-axis direction (thickness direction of the frame part 110) longer than the length T1 of the formation surface 111a of the same-shaped sound emission hole 171 in the thickness direction of the frame part 110 in the first hole frame 111. Since the outer surface 110a of the frame part 110 is flush, the inner surface 110b of the center part of the frame part 110 is provided in a convex shape at the part of the second hole frame 112. As shown in FIG. 4, the second hole frame 112 can be provided corresponding to the central recess of the speaker cone 21 of the sound emission device 20. The second hole frame 112 has a portion located inside the speaker cone 21. The first hole frame 111 is not located inside the speaker cone 21.

[0029] Next, the second sound emitting section 200 will be described. As shown in Figs. 3 and 4, the sound emitting holes 250 provided in the frame section 210 of the second sound emitting section 200 are composed of a plurality of identical sound emitting holes 270. In other words, the second sound emitting section 200 includes a frame section 210 having sound emitting holes 250 composed of identical sound emitting holes 270 instead of the plurality of sound emitting holes 150 including the first sound emitting hole 160-1 to the seventh sound emitting hole 160-7 of the first sound emitting section 100. The plurality of identical sound emitting holes 270 are formed into a substantially hexagonal shape, which is a polygonal shape, and are provided in a substantially honeycomb shape. Similarly to the first sound emitting section 100, the frame section 210 of the second sound emitting section 200 is provided with linear frames 220-1 to 220-6.

[0030] Next, as shown in Fig. 9, the frame 215 of the second sound emitting section 200 has a first hole frame 211 and a second hole frame 212 having formation surfaces 211a, 212a of the sound emitting holes 250. As shown in Fig. 8, the length T4 of the formation surface 212a of the sound emitting holes 250 in the axial direction (Y-axis direction, thickness direction of the frame section 210) in the second hole frame 212 is longer than the length T3 of the formation surface 211a in the thickness direction (Y-axis direction) of the frame section 210 in the first hole frame 211. Also, the length T4 is shorter than the length T2.

[0031] The second hole frame 112 is convex in side view like the sixth sound emission hole 160-6 and the seventh sound emission hole 160-7 in order to spread the sound, so the inclined surface is long, and therefore the length T2 is relatively long. On the other hand, the frame 215 of the second sound emission part 200 does not need to spread the sound in terms of acoustic characteristics, so the length T4 is shorter than the length T2. The arrangement of the frame parts 110 and 210 is not limited to this embodiment, and the arrangement can be changed, including the lengths T2 and T4, according to the desired acoustic characteristics.

[0032] In the second sound emitting section 200, a predetermined region Q in the approximate center of the frame section 210 is formed of a second hole frame 212, thereby increasing the strength of the frame section 210. In addition, as shown in Fig. 4, the second hole frame 212 can be provided in correspondence with a central recess of the speaker cone 21 of the sound emitting device 20.

[0033] Here, the rear panel 15 is formed by injection molding of resin. At this time, the forming surfaces of the sound emission holes 150, 250 are provided with draft tapers that expand from the outside toward the inside of the rear panel 15. For example, as shown in Fig. 7(b) and Fig. 8, the forming surfaces 111a, 112a, 211a, 212a are provided with draft tapers by expanding slightly from the outside toward the inside of the rear panel 15.

[0034] The mold 50 for molding the rear panel 15 has a cavity mold 51 and a core mold 52. In Figs. 10 and 11 showing the first sound emitting section 100, the shaded portion (front side of the rear panel 15) is the surface molded by the cavity mold 51, and the white portion is the surface molded by the core mold 52. Four bosses 15a for attaching the rear cover 12 are provided on the outer periphery of the front side (outside) of the first sound emitting section 100 shown in Fig. 10. Bosses 15b for connecting to the instrument case 19 of the electronic keyboard instrument 10 are provided around the back side (inside) of the first sound emitting section 100 shown in Fig. 11.

[0035] In molding the hexagonal holes of the identical sound emitting holes 170, 270, they can be molded by providing hexagonal columnar protrusions on the core mold 52. In molding the first sound emitting hole 160-1 to the third sound emitting hole 160-3, in order to form the inclined portions (the first inclined portion 161b to the third inclined portion 163b), the cavity mold 51 and the core mold 52 are configured as follows.

[0036] In the mold 50, a hexagonal column 53 having a pair of inclined surfaces 51a, 52a on opposing sides that incline in the same direction is divided between opposing tops M1, M2, and a pin 51b, which is one side of the divided hexagonal column 53, is provided in a cavity mold 51, and a pin 52b, which is the other side, is provided in a core mold 52.

[0037] A molding method for rear panel 15, which is an exterior member, using this mold 50 includes a step of clamping mold 50 and a step of injecting molten resin into clamped mold 50. This results in frame portion 110 being molded by hexagonal column 53, in which first sound emission hole 160-1 to third sound emission hole 160-3 are provided with inclined surfaces (first inclined surface 161a, etc.) within the hole areas.

[0038] In this manner, in the cavity mold 51 and the core mold 52 for the first sound emission hole 160-1 to the third sound emission hole 160-3, the line connecting the opposing apexes M1, M2 of the hexagon is defined as the parting line PL.

[0039] Furthermore, the molding method of the first hole frame 111, 211 and the second hole frame 112, 212 will be described with reference to FIG. 7(a) and FIG. 7(b) showing the periphery of the identical sound emission holes 171, 172 of the first sound emission part 100. As shown in FIG. 7(b), the core mold 52 of the mold 50 has a first pin 52c corresponding to the forming surface 111a of the first hole frame 111 and a second pin 52d corresponding to the forming surface 112a of the second hole frame 112. The molding method of the rear panel 15 using the mold 50 includes a mold clamping step of clamping the mold 50 and a step of injecting molten resin, as described above. Then, the frame part 110 having a plurality of sound emission holes 150 including the first hole frame 111 and the second hole frame 112 is molded.

[0040] Although the first sound radiating section 100 has been described with reference to FIGS. 7(a) and 7(b), the same is true for the first hole frame 211 and the second hole frame 212 of the second sound radiating section 200.

[0041] As described above, in the embodiment of the present invention, the rear panel 15, which is an exterior member, has a frame portion 110 having a plurality of sound emission holes 150 including a first sound emission hole 160-1 and a second sound emission hole 160-2, a first inclined portion 161b arranged on the frame portion 110 in the region of the first sound emission hole 160-1 with a first inclined surface 161a arranged inclined from the thickness direction (Y-axis direction) of the frame portion 110 facing a first direction 161c, and a second inclined portion 162b arranged in the region of the second sound emission hole 160-2 with a second inclined surface 162a facing a second direction 162c different from the first direction 161c. The frame portion 110 has the first sound emission hole 160-1 to the fourth sound emission hole 160-4 whose sound emission directions (first direction 161c to fourth direction 164c) are different from each other.

[0042] As a result, the sound emission direction (first direction 161c to fourth direction 164c) can be freely set by arranging the inclined surfaces (first inclined surface 161a to fourth inclined surface 164a) of the inclined portions (first inclined portion 161b to fourth inclined portion 164b) in sound emission hole 150 (first sound emission hole 160-1 to fourth sound emission hole 160-4). Therefore, even if it is difficult to adjust the direction of the speaker due to the internal space, the user can hear a wide sound.

[0043] Furthermore, by making the first sound emission hole 160-1 and the second sound emission hole 160-2 polygonal, the sides can be provided with inclined portions (first inclined portion 161b, second inclined portion 162b) connecting them, making it even easier to set the sound emission direction.

[0044] Moreover, by forming the first sound emission hole 160-1 and the second sound emission hole 160-2 in a hexagonal shape, the sound emission direction can be easily set to any hexagon.

[0045] Further, the sound emission holes 150 of the frame part 110 include a fourth sound emission hole 160-4 and a fifth sound emission hole 160-5 which are rectangular sound emission holes 150, and in the area of ​​the fourth sound emission hole 160-4 and the fifth sound emission hole 160-5, inclined parts (fourth inclined part 164b, fifth inclined part 165b) having inclined surfaces (fourth inclined surface 164a, fifth inclined surface 165a) arranged inclined from the thickness direction (Y-axis direction) of the frame part 110 are provided in a direction different from the first direction 161c and the second direction 162c. This makes it possible to provide the back panel 15 which is an exterior member having a further expansion in the sound emission direction.

[0046] Furthermore, the plurality of sound emitting holes 150 including the first sound emitting hole 160-1 and the second sound emitting hole 160-2, particularly the plurality of first sound emitting holes 160-1 to third sound emitting holes 160-3 and the uniform sound emitting holes 170, are arranged in a honeycomb pattern, whereby the frame portion 110 having high strength can be configured.

[0047] Further, the rear panel 15, which is an exterior member, has a first sound emission section 100 including a frame section 110 consisting of sound emission holes 150 including a plurality of identical sound emission holes 170 in addition to a plurality of first sound emission holes 160-1 and second sound emission holes 160-2, and a second sound emission section 200 including a frame section 210 consisting of identical sound emission holes 270 instead of the plurality of sound emission holes 150 including the first sound emission holes 160-1 and second sound emission holes 160-2. This makes it possible to provide the first sound emission section 100 that can give a spread to the emitted sound, and the rear panel 15 that includes the sound emission hole 250 consisting of the identical sound emission hole 270 that emits sound without blocking the sound emission hole 250 to emit a powerful sound.

[0048] The two first sound emitting sections 100 are arranged on the outside in a direction (X-axis direction) perpendicular to the thickness direction (Y-axis direction) of the frame sections 110 and 210, and the two second sound emitting sections 200 are arranged on the inside. This allows the first sound emitting sections 100, which have a wide range of sound to emit sound, to emit sound efficiently.

[0049] Moreover, the first sound emitting section 100 has the same shaped sound emitting holes provided in the inner half in the direction perpendicular to the thickness direction of the frame section 110. This allows the first sound emitting hole 160-1, the second sound emitting hole 160-2, etc. to be provided on the outer side, thereby reducing interference between the sound spreading outward and the sound emitted linearly in the Y-axis direction.

[0050] The outer edge of the frame parts 110 and 210 has an elliptical outer shape. This makes it possible to provide a rear panel 15 with a wide sound spread even if the housing is made small by using an elliptical sound emitting device 20 such as a speaker.

[0051] Furthermore, the outer edge of the frame parts 110 and 210 is formed in an elliptical shape, which makes it possible to provide an exterior member that spreads sound even when an elliptical speaker is used and the speaker is attached to a small device.

[0052] The rear panel 15 is provided on the electronic keyboard instrument 10, which serves as an electronic musical instrument. This allows the electronic keyboard instrument 10, which has a rectangular, flat shape, to have a wide range of sound.

[0053] The molding method of the rear panel 15 includes a step of clamping a mold 50 having a cavity mold 51 with a pin 51b on one side of a hexagonal column obtained by dividing a pair of inclined surfaces 51a, 52a inclined in the same direction on opposing side surfaces between opposing apexes M1, M2, and a core mold 52 with a pin 52b on the other side, and a step of injecting molten resin into the mold 50 to mold a frame part 110 provided with sound emission holes 150 (first sound emission holes 160-1, etc.) with inclined surfaces (first inclined surface 161a, etc.) within the area of ​​the holes (first sound emission holes 160-1, etc.). This allows the parting line to be formed between the apexes of the hexagonal sound emission holes 150 (first sound emission holes 160-1, etc.), so that the cavity mold 51 and the core mold 52 can be provided without complicating the structure of the mold 50.

[0054] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0055] 10: Electronic keyboard instrument 11: Top surface 12: Rear cover 13: Adjustment knob 15: Rear panel 18: Connector panel 19: Instrument case 20: Sound emission device 21: Speaker cone 30: Keyboard 31: Operation unit 50: Mold 51: Cavity mold 51a: Inclined surface 52: Core mold 52a: Inclined surface 53: Hexagonal column 100: First sound emission section 110: Frame section 110a: Outer surface 110b: Inner surface 111: First hole frame 111a: Forming surface 112: Second hole frame 112a: Forming surface 115: Frame 150: Sound emission hole 160-1: First sound emission hole 160-2: Second sound emission hole 160-3: Third sound emission hole 160-4: Fourth sound emission hole 160-5: 5th sound emission hole 160-6: 6th sound emission hole 160-7: 7th sound emission hole 161: 1st sound emission hole 161a: 1st slope 161b: 1st slope 161c: 1st direction 162: 2nd sound emission hole 162a: 2nd slope 162b: 2nd slope 162c: 2nd direction 163: Third sound emission hole 163a: Slope 163b: Third slope 163c: Third direction 164: Fourth sound emission hole 164a: Fourth slope 164b: Fourth slope 164c: Fourth direction 165: Fifth sound emission hole 165a: Fifth slope 165b: Fifth slope 165c: Fifth direction 166a: 6th slope 166b: 6th inclined part 167a: 7th inclined surface 167b: 7th inclined part 170: Same-shaped sound emission hole 200: 2nd sound emission part 210: Frame part 210a: Outer surface 211: 1st hole frame 212: 2nd hole frame 215: Frame 250: Sound emission hole 270: Same-shaped sound emission hole

Claims

1. a frame portion having a plurality of sound emitting holes including a first sound emitting hole and a second sound emitting hole; a first inclined portion disposed on the frame portion within a region of the first sound emission hole, the first inclined surface being inclined from a thickness direction of the frame portion and facing a first direction; a second inclined portion disposed on the frame portion within a region of the second sound emission hole, the second inclined portion having an inclined surface inclined from a thickness direction of the frame portion facing a second direction different from the first direction; having The first sound emission hole and the second sound emission hole are provided in a hexagonal shape, The sound emission hole of the frame portion includes a rectangular sound emission hole, An exterior member in which an inclined portion is provided within the area of ​​the rectangular sound emission hole, the inclined portion having an inclined surface that is inclined from the thickness direction of the frame portion toward a direction different from the first direction and the second direction.

2. The exterior member according to claim 1 , wherein the plurality of sound emission holes including the first sound emission hole and the second sound emission hole are arranged in a honeycomb pattern.

3. a frame portion including a plurality of sound emission holes including a sound emission hole having the same shape on the inside and outside in a thickness direction of the frame portion in addition to the first sound emission hole and the second sound emission hole as a first sound emission portion, a frame portion including the sound emission holes of the same shape as the sound emission holes, instead of the plurality of sound emission holes including the first sound emission hole and the second sound emission hole, as a second sound emission portion; The exterior member according to claim 1 or 2.

4. The two first sound emitting units and the two second sound emitting units are arranged in series in a direction perpendicular to a thickness direction of the frame unit, The two first sound emitting sections are disposed on the outer sides in a direction perpendicular to the thickness direction of the frame section, The two second sound emitting sections are disposed on the inner side in a direction perpendicular to the thickness direction of the frame section. The exterior member according to claim 3 .

5. 5 . The exterior member according to claim 3 , wherein the first sound emitting portion has the same-shaped sound emitting holes provided in a substantially inner half in a direction perpendicular to a thickness direction of the frame portion.

6. The frame portion has an outer edge having an elliptical outer shape. The exterior member according to any one of claims 1 to 5.

7. A sound emitting device is provided on the inner side of the frame portion in the thickness direction of the frame portion. The exterior member according to any one of claims 1 to 6.

8. An electronic musical instrument comprising the exterior member according to any one of claims 1 to 7.

9. a frame portion having a plurality of sound emitting holes including a first sound emitting hole and a second sound emitting hole; a first inclined portion disposed on the frame portion within a region of the first sound emission hole, the first inclined surface being inclined from a thickness direction of the frame portion and facing a first direction; a second inclined portion disposed on the frame portion within a region of the second sound emission hole, the second inclined portion having an inclined surface inclined from a thickness direction of the frame portion facing a second direction different from the first direction; having a frame portion including a plurality of sound emission holes including a sound emission hole having the same shape on the inside and outside in a thickness direction of the frame portion in addition to the first sound emission hole and the second sound emission hole as a first sound emission portion, an exterior member including the frame portion having the same-shaped sound emission holes as the second sound emission portion, instead of the plurality of sound emission holes including the first sound emission hole and the second sound emission hole;

10. The exterior member according to claim 9 , wherein the first sound emission hole and the second sound emission hole are provided in a polygonal shape.

11. The exterior member according to claim 10 , wherein the first sound emission hole and the second sound emission hole are provided in a hexagonal shape.

12. 12. The exterior member according to claim 9, wherein the plurality of sound emission holes including the first sound emission hole and the second sound emission hole are arranged in a honeycomb pattern.

13. The two first sound emitting units and the two second sound emitting units are arranged in series in a direction perpendicular to a thickness direction of the frame unit, The two first sound emitting sections are disposed on the outer sides in a direction perpendicular to the thickness direction of the frame section, The two second sound emitting sections are disposed on the inner side in a direction perpendicular to the thickness direction of the frame section. The exterior member according to any one of claims 9 to 12.

14. 14. The exterior member according to claim 9, wherein the first sound emitting portion has the same-shaped sound emitting holes provided in a substantially inner half in a direction perpendicular to a thickness direction of the frame portion.

15. The frame portion has an outer edge having an elliptical outer shape. The exterior member according to any one of claims 9 to 14.

16. A sound emitting device is provided on the inner side of the frame portion in the thickness direction of the frame portion. The exterior member according to any one of claims 9 to 15.

17. An electronic musical instrument comprising the exterior member according to any one of claims 9 to 16.

18. A step of clamping a mold having a cavity mold including one side of a hexagonal prism having a pair of inclined surfaces inclined in the same direction on opposing side surfaces and a core mold including the other side of the hexagonal prism, the cavity mold including one side of the hexagonal prism being divided between opposing tops of the hexagonal prism; a step of injecting molten resin into the mold to form a frame portion having a sound emission hole with an inclined surface within the hole area by the hexagonal column; A method for molding an exterior member having the above structure.

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