Sound emitting devices and electronic musical instruments

Abstract

To suitably arrange a sound emission part.SOLUTION: A sound emission unit 4 includes: a chamfered surface 411 chamfered adjacent to three surfaces contacting a vertex P of a substantially rectangular parallelepiped sound emission case 41; and a speaker 42 arranged on the chamfered surface 411.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a sound emitting device and an electronic musical instrument. [Background technology]

[0002] Conventionally, electronic musical instruments such as electronic pianos and keyboards are provided with a sound output device that outputs sound. Generally, in this type of sound output device, a sound output unit (speaker) is disposed on the top or back surface of a housing that holds the keyboard (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-338972 [Patent Document 2] Japanese Patent Publication No. 2020-178336 Summary of the Invention [Problem to be solved by the invention]

[0004] However, simply placing the sound emitting section on the top or back surface of the housing poses problems in terms of the strength of the housing and the spread of sound. The present invention has been made in view of the above circumstances, and has as its object to provide a suitable arrangement of a sound emitting section. [Means for solving the problem]

[0005] In order to achieve the above object, the sound emitting device according to the present invention comprises: A rectangular parallelepiped that is long in the first direction formed into a shape a case member having a rib that divides an internal space in the first direction and having chamfered surfaces that are chamfered adjacent to three faces that contact the vertices of the rectangular parallelepiped; a cover member that closes the lower surface of the case member; a sound emitting portion disposed on the chamfered surface; a duct member extending in the first direction, the duct member having both sides in the first direction individually communicating with the two internal spaces of the case member partitioned by the rib; a hole is formed in the center of the cover member in the first direction; a central portion of the duct member in the first direction communicates with the outside through the hole; the case member has two chamfered surfaces on both sides in the first direction, and holds two of the sound emitting units arranged on the two chamfered surfaces, respectively; The common duct member and the hole form two bass reflex structures corresponding to the two sound emitting sections. [Effects of the Invention]

[0006] According to the present invention, the sound emitting section can be suitably arranged. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a perspective view of an electronic musical instrument according to an embodiment. [Figure 2] FIG. 2 is an enlarged view of the sound emitting unit and its surroundings in FIG. [Figure 3] 10A and 10B are diagrams illustrating modified examples of the chamfered surface of the sound emitting case according to the embodiment. [Figure 4] FIG. 2 is an exploded perspective view of the sound emission unit according to the embodiment. [Figure 5] FIG. 2 is a vertical cross-sectional view of the sound emission unit according to the embodiment. [Figure 6] 10A and 10B are diagrams for explaining the orientation of chamfered surfaces (speakers) according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] 1 to 6, an embodiment of a sound emitting device and an electronic musical instrument according to the present invention will be described. It should be noted that the embodiments described below are subject to various limitations that are technically preferable for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.

[0009] FIG. 1 is a perspective view of an electronic musical instrument 1 according to this embodiment. In the following description, the front, back, left, right, top and bottom directions refer to the directions shown in the drawings. 1, the electronic musical instrument 1 according to this embodiment is a keyboard in which a keyboard 2 having a plurality of keys 21 is held in a long instrument case 3. Sound-emitting units 4 are provided on both the left and right sides of the instrument case 3.

[0010] Fig. 2 is an enlarged view of the periphery of the sound emitting unit 4 in Fig. 1, and Fig. 3 is a diagram showing a modified example of a chamfered surface 411 on which the speaker 42 is disposed of the sound emitting case 41 of the sound emitting unit 4. Fig. 4 is an exploded perspective view of the sound emitting unit 4, and Fig. 5 is a vertical cross-sectional view of the sound emitting unit 4. Since the two sound-emitting units 4 provided on the left and right sides of the electronic musical instrument 1 are configured symmetrically with respect to each other, the following will only describe the one provided on the right side of the electronic musical instrument 1, and will omit a description of the one provided on the left side of the electronic musical instrument 1.

[0011] As shown in Figure 2, the sound emitting unit 4 is an example of a sound emitting device according to the present invention, and includes a sound emitting case 41, two speakers (sound emitting sections) 42, a duct member 43, and a case bottom plate 44 (see Figures 4 and 5).

[0012] The sound output case 41 is an enclosure for the sound output unit 4 that supports two speakers 42. The sound output case 41 is long from front to back, and is formed in the shape of a substantially rectangular parallelepiped box with an upper surface that slopes gently downward toward the front and an open bottom surface.

[0013] The sound emitting case 41 has two chamfered surfaces 411 (a front chamfered surface 411a and a rear chamfered surface 411b) on which the speakers 42 are respectively arranged. Each chamfered surface 411 has an opening 412 to which the speaker 42 is attached, and two through holes 413 formed therein. Of the two chamfered surfaces 411, the front chamfered surface 411a provided on the front side of the sound emitting case 41 is formed so as to cut away the front corners (vertices) of the sound emitting case 41, and is formed into a substantially rectangular shape having at least four sides that contact both the top and bottom and the left and right sides of the sound emitting case 41. This front chamfered surface 411a faces diagonally to the right front (outside the left and right) in a plan view, and faces diagonally to the front and slightly downward in a side view. On the other hand, the rear chamfered surface 411b provided on the rear side of the sound emitting case 41 is formed so as to cut away the corner (vertex) on the rear right side of the sound emitting case 41, and is formed in a substantially triangular shape having at least three sides that contact the top surface, right surface, and rear surface (back surface) of the sound emitting case 41. This rear chamfered surface 411b faces diagonally rearward and rightward (outward from the left and right) in a plan view, and faces diagonally rearward and upward in a side view.

[0014] The chamfered surfaces 411 are not limited to the above shape, and may be chamfered adjacent to the three surfaces that contact the vertices of the rectangular parallelepiped (sound emitting case 41). For example, as shown in FIG. 3(a), the chamfered surface 411 may be a triangle formed by cutting away the vertex P of the sound emitting case 41 (rectangular parallelepiped) and adjoining the three faces that are in contact with it, or may be a square shape as shown in FIG. 3(b). By providing such chamfered surfaces 411, ridges can be formed at the corners of sound emitting case 41, improving strength (rigidity) and reducing weight.

[0015] 4 and 5, the sound emitting case 41 has a rib 414 that divides the internal space S into front and rear. The rib 414 is erected in the approximate center between the front and rear of the internal space S of the sound emitting case 41 so as to divide the volume of the internal space S of the sound emitting case 41 into approximately equal front and rear halves. The rib 414 divides the internal space S of the sound emitting case 41 into a front space S1 that houses the speakers 42 arranged on the front chamfered surface 411a, and a rear space S2 that houses the speakers 42 arranged on the rear chamfered surface 411b.

[0016] The speaker 42 has a cone 422, a coil (not shown), etc. held by a frame 421, and outputs sound based on an audio output signal from a control unit (not shown) of the electronic musical instrument 1. The speaker 42 is disposed on each of the chamfered surfaces 411 from the inside of the sound emitting case 41 so that the cone 422 is exposed from the opening 412. Two fixing portions 421a each having a screw hole are protruded from the frame 421 of the speaker 42. The two fixing portions 421a correspond to two through holes 413 provided in each chamfered surface 411, and the speaker 42 is fixed to the sound emitting case 41 by fastening fixing screws (not shown) inserted through the two through holes 413 to the two fixing portions 421a.

[0017] The duct member 43 is for forming a duct (ventilation pipe T) of a predetermined length that communicates with the outside between itself and the case bottom plate 44. Specifically, the duct member 43 is formed long in the front-to-rear direction, has left and right side walls along its entire length, and is formed in a concave shape that opens downward. Both front and rear end surfaces of the duct member 43 are also open, forming a front opening 43a and a rear opening 43b. In addition, a partition plate 431 is erected at approximately the center of the front-to-rear direction on the underside of the duct member 43, at approximately the same height as the side walls. The duct member 43 is disposed at a lower portion within the internal space S of the sound emitting case 41 so that the upper surface thereof abuts against (or is close to) the rib 414 of the sound emitting case 41.

[0018] The case bottom plate 44 is a lid member that closes the bottom opening of the musical instrument case 3. A hole 441 is formed in approximately the center in the front-to-rear direction of the case bottom plate 44. The hole 441 is positioned so as to straddle the partition plate 431 of the duct member 43 from front to rear when the case bottom plate 44 is attached to the sound emitting case 41.

[0019] 5, in the sound output unit 4 having the above configuration, the internal space S of the sound output case 41 is divided into a front space S1 that houses the front speaker 42 arranged on the front chamfered surface 411a, and a rear space S2 that houses the rear speaker 42 arranged on the rear chamfered surface 411b. The front space S1 and the rear space S2 are divided by the rib 414 so that their volumes are approximately the same. Therefore, the speaker performance (e.g., bass reflex) related to the volume of the enclosure is approximately the same between the front speaker 42 and the rear speaker 42.

[0020] In the sound emission unit 4, the case bottom plate 44 closes the lower opening of the duct member 43, thereby forming two communication pipes T therebetween. Of the two communication pipes T, the front communication pipe T from the front opening 43a to the hole 441 connects the front space S1 to the outside, and the rear communication pipe T from the rear opening 43b to the hole 441 connects the rear space S2 to the outside. In this way, the two speakers 42 of the sound emission unit 4 each have a bass reflex structure including the communication pipe (duct) T and the hole (port) 441, while sharing some of the same configuration. This makes it possible to enhance the low-frequency range output from each speaker 42 with a simple configuration, and even a relatively small speaker 42 can output a wide range of sound.

[0021] As described above, according to this embodiment, the speaker 42 is disposed on the chamfered surfaces 411 that are chamfered adjacent to three surfaces that contact the vertex P of the sound emitting case 41 that is substantially a rectangular parallelepiped. This allows for ridge lines to be formed at the corners of sound emitting case 41, improving strength and reducing weight, while also allowing speaker 42 to be placed on chamfered surface 411 that includes the ridge lines. Therefore, speaker 42 can be placed more appropriately than in the past.

[0022] Furthermore, according to this embodiment, the duct member 43 has both front and rear sides individually connected to the front space S1 and rear space S2 of the sound emitting case 41, and the central part of the duct member 43 in the front and rear directions is connected to the outside through the hole 441 in the case bottom plate 44. This allows the bass reflex structure including the communication pipe (duct) T and the hole (port) 441 to be provided individually for the two speakers 42 of the sound emission unit 4 while sharing some of the configuration. Therefore, it is possible to enhance the bass range output from each speaker 42 while achieving a simple configuration that reduces the number of parts and simplifies assembly. However, the two bass reflex structures provided in correspondence with the two speakers 42 are not limited to the above configuration as long as they have at least a part of the configuration in common.

[0023] It goes without saying that the embodiments to which the present invention can be applied are not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present invention.

[0024] For example, in the above embodiment, the two fixing portions 421a of the speaker 42 are fixed to the two through holes 413 of the chamfered surface 411. However, as shown in Fig. 3(a), for example, a plurality of through holes 413 may be provided in the chamfered surface 411 corresponding to its multiple vertices (three in Fig. 3(a)), and the corresponding fixing portions 421a of the speaker 42 may be fixed to the plurality of through holes 413. This makes it possible to effectively use the narrow space near the vertices of the chamfered surface 411 while arranging (fixing) the speaker 42 on the chamfered surface 411.

[0025] Furthermore, the orientation of the chamfered surface 411 on which the speakers 42 are arranged is not particularly limited as long as at least the two sound-emitting units 4 face in different directions. By emitting sounds in different directions from the front and rear of the sound-emitting units 4, it is possible to expect the effect of spreading the sound into the surrounding space. However, as shown in Figure 6(a) (the orientation of the chamfered surfaces 411 (speakers 42) is indicated by thick arrows), it is more preferable that the four chamfered surfaces 411 on both the left and right sides of the electronic musical instrument 1 face in a generally radial direction in a plan view. This allows for 360-degree sound field reproduction, and enables sound to be output evenly to the surrounding audience. 6(b), the rear chamfered surface 411b of the sound-emitting unit 4 may be oriented higher than the front chamfered surface 411a. This allows for a greater sound dispersion effect, including sound reflections from the wall, when the electronic musical instrument 1 is placed with its back facing a wall, for example. Also, the front chamfered surface 411a may be oriented further forward (or further toward the center of the electronic musical instrument 1). This allows the speaker 42 on the front chamfered surface 411a to be positioned closer to the performer, allowing the performer to experience a more realistic sound.

[0026] Furthermore, the sound emitting case 41 of the sound emitting unit 4 may be integral with the musical instrument case 3 that holds the keyboard 2, or may be configured to be detachable. Furthermore, a main speaker may be provided on the top or rear surface of the musical instrument case 3, separate from the sound output unit 4. In this case, for example, the speakers 42 of the relatively small sound output unit 4 may output ambient sounds or backing band performances, while the main speaker may output the sounds of hand-played instruments. This can enhance the sense of immersion in the performance.

[0027] In the above embodiment, the sound emitting device according to the present invention has been described by taking the sound emitting unit 4 of the electronic musical instrument 1 as an example. However, the sound emitting device according to the present invention is not limited to being provided in an electronic musical instrument, and can be widely applied to various devices that output sound (for example, televisions, personal computers, stereos, etc.).

[0028] Although several embodiments of the present invention have been described above, the scope of the present invention is not limited to the above-described embodiments, but includes the scope of the invention described in the claims and its equivalents. The inventions described in the claims originally attached to this application are as follows. The claim numbers described in the appendix are the same as those of the claims originally attached to this application. [Note] <Claim 1> chamfered surfaces adjacent to three faces that contact the vertices of the rectangular parallelepiped; a sound emitting portion disposed on the chamfered surface; Equipped with A sound emitting device characterized by: <Claim 2> the chamfered surface has a plurality of attachment portions corresponding to a plurality of vertices, The sound emitting unit has a plurality of fixing portions corresponding to the plurality of mounting portions. 2. The sound emitting device according to claim 1 . <Claim 3> a case member formed in a rectangular parallelepiped shape that is elongated in a first direction, having two of the chamfered surfaces on both sides in the first direction, and holding two of the sound emitting units that are arranged on the two chamfered surfaces; The two chamfered surfaces face in different directions. 3. The sound emitting device according to claim 1 or 2. <Claim 4> the first direction is a front-to-rear direction of the sound emitting device, Of the two chamfered surfaces, the rear chamfered surface faces upward relative to the front chamfered surface. 4. The sound emitting device according to claim 3. <Claim 5> a case member formed in a rectangular parallelepiped shape that is elongated in a first direction, having two of the chamfered surfaces on both sides in the first direction, and holding two of the sound emitting units that are arranged on the two chamfered surfaces; The speaker has two bass reflex structures corresponding to the two sound emitting sections and having at least a part of the same configuration. 5. The sound emitting device according to claim 1, wherein the sound emitting device is a sound emitting device. <Claim 6> the case member has a rib that divides the internal space in the first direction, a duct member extending in the first direction, the duct member having both sides in the first direction individually communicating with two internal spaces of the case member partitioned by the rib; a hole portion that connects a central portion of the duct member in the first direction to the outside; Equipped with 6. The sound emitting device according to claim 5. <Claim 7> The keyboard and the sound emitting devices according to any one of claims 1 to 6, which are arranged at symmetrical positions with respect to the keyboard; Equipped with An electronic musical instrument characterized by: [Explanation of symbols]

[0029] 1. Electronic Instruments 2 keys 4. Sound emission unit (sound emission device) 41 Sound emitting case (case material) 42 Speaker (sound output section) 43 Duct parts 43a Front opening 43b Rear opening 44 Case bottom plate 411 Chamfered surface 411a Front chamfer 411b Rear chamfered surface 413 Through hole (mounting part) 414 Ribs 421a Fixed part 441 Hole P Vertex S interior space S1 front space S2 rear space T communication pipe

Claims

1. a case member formed in a rectangular parallelepiped shape that is elongated in a first direction, the case member having ribs that divide an internal space in the first direction, and having chamfered surfaces that are chamfered adjacent to three faces that contact vertices of the rectangular parallelepiped; a cover member that closes the lower surface of the case member; a sound emitting portion disposed on the chamfered surface; a duct member extending in the first direction, the duct member having both sides in the first direction individually communicating with the two internal spaces of the case member partitioned by the rib, a hole is formed in the center of the cover member in the first direction; a central portion of the duct member in the first direction communicates with the outside through the hole; the case member has two chamfered surfaces on both sides in the first direction, and holds two of the sound emitting units arranged on the two chamfered surfaces, respectively; The common duct member and the hole form two bass reflex structures corresponding to the two sound emitting sections. A sound emitting device characterized by:

2. the chamfered surface has a plurality of attachment portions corresponding to a plurality of vertices of the chamfered surface; The sound emitting unit has a plurality of fixing portions corresponding to the plurality of mounting portions.

2. The sound emitting device according to claim 1.

3. The two chamfered surfaces face in different directions.

3. The sound emitting device according to claim 1 or 2.

4. the first direction is a front-to-rear direction of the sound emitting device, Of the two chamfered surfaces, the rear chamfered surface faces upward relative to the front chamfered surface.

4. The sound emitting device according to claim 3.

5. The keyboard and The sound emitting devices according to any one of claims 1 to 4, which are arranged at symmetrical positions with respect to the keyboard; Equipped with An electronic musical instrument characterized by:

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