Sounding device and electronic keyboard instrument

Abstract

The invention provides a sound generating device and an electronic keyboard instrument. The sound generating device is provided with: a box-shaped support frame having an upper opening; the sound production component is arranged on the supporting frame and is integrally formed, the sound production component and the supporting frame form a containing space for containing a loudspeaker, a sound box space connected with the containing space, and a pipeline connected with the containing space. The sound space is a space corresponding to a region including a plurality of downward protruding portions protruding upward, the plurality of downward protruding portions are arranged side by side in the left-right direction and fix the support frame and the sound generating member, and the support frame has a port opened at a position corresponding to the duct.

Description

Technical Field

[0001] This invention relates to a sound-generating device and an electronic keyboard musical instrument. Background Technology

[0002] From the perspective of ease of handling and storage, electronic keyboard instruments require miniaturization of the housing. However, due to the miniaturization of the housing, the sound emitted from the inside (back) of the speaker's diaphragm interferes with the sound emitted from the surface (front) of the speaker's diaphragm, potentially reducing the bass sound quality. Therefore, Japanese Utility Model Application Publication No. 6-26386 discloses a technology that does not reduce the bass sound quality even with miniaturization. Summary of the Invention

[0003] The problem that the invention aims to solve

[0004] The electronic keyboard musical instrument described in Japanese Utility Model Publication No. 6-26386 has a structure that makes it difficult for sound emitted from the back of the speaker to interfere with sound emitted from the front of the speaker. However, since bass frequencies have a higher diffraction characteristic than treble frequencies, the structure described in Japanese Utility Model Publication No. 6-26386... Figure 1 The sound emitted from the sound-emitting hole 9 is diffracted, resulting in interference between the sound emitted from the back of the speaker and the sound emitted from the front of the speaker, making it difficult to completely ensure bass. Therefore, the object of the present invention is to provide a sound-emitting device and an electronic keyboard instrument that improves bass playback capability.

[0005] Methods for solving problems

[0006] One aspect of the sound-generating device disclosed herein includes: a box-shaped support frame with an opening at the top; and a sound-generating component integrally formed and disposed on the support frame, wherein the sound-generating component and the support frame form a storage space for housing a speaker, an acoustic space connected to the storage space, and a conduit connected to the storage space, the acoustic space being a space corresponding to a region containing a plurality of downwardly protruding portions protruding upwards, the plurality of downwardly protruding portions being arranged in a left-right direction and fixing the support frame and the sound-generating component, the support frame having a port with an opening at a position corresponding to the conduit.

[0007] Invention Effects

[0008] According to the present invention, a sound-generating device and an electronic keyboard musical instrument with improved bass playback capability can be provided. Attached Figure Description

[0009] Figure 1 This is a perspective view of an electronic keyboard musical instrument according to an embodiment.

[0010] Figure 2This is a perspective view of the electronic keyboard musical instrument according to the embodiment, broken down into an upper shell and a lower shell.

[0011] Figure 3 yes Figure 2 The sectional view of section II-II shown.

[0012] Figure 4 It is located in Figure 3 The diagram shows the sound-generating device on the right side, broken down into the sound-generating component, the loudspeaker, and the support frame.

[0013] Figure 5 It is located in Figure 3 The sound-generating device on the right side is broken down into a three-dimensional view of the sound-generating component and the support frame.

[0014] Figure 6 Figure 6A From Figure 4 The diagram shows the sound-producing component with the speaker removed and viewed from above. Figure 6B This is a view from below.

[0015] Figure 7 This is a view from above of a portion of the lower housing after the sound-producing component has been removed from the sound-producing device located at the right rear of the electronic keyboard instrument according to the embodiment.

[0016] Figure 8 yes Figure 7 The sectional view of section VII-VII shown.

[0017] Figure 9 It is Figure 3 An enlarged view of a portion of the right side of the sectional view.

[0018] Figure 10 This is a diagram showing the electronic keyboard instrument as viewed from below according to the implementation method. Detailed Implementation

[0019] The following is for reference Figures 1-10 The construction of an electronic keyboard musical instrument 1 according to one embodiment of the present disclosure will be described. Figure 1 The electronic keyboard instrument 1 shown includes a housing 10 and a keyboard 12 having multiple keys arranged along the length of the housing 10. Sound-producing devices 28L and 28R are located inside the housing 10. Sound is produced from the sound-producing devices 28L and 28R according to the player's operation of the keyboard 12. Furthermore, in the following description, as... Figure 1 As shown, the key arrangement direction of keyboard 12 is defined as left and right (…). Figure 1 (The left side is taken as the left direction), and the extension direction of the keys on keyboard 12 is defined as the front and back direction (taking the left side as the left direction). Figure 1 The front side is taken as the forward direction. The left and right directions are orthogonal to the front and back directions. The directions orthogonal to the left and right and front and back directions are defined as the up and down directions (the front and back directions are defined as the left and right directions). Figure 1 (The upper side is considered the upper direction). Furthermore, the sound-producing device 28L located on the left side of the electronic keyboard instrument 1 corresponds to the low-frequency range, and the sound-producing device 28R located on the right side corresponds to the high-frequency range. Hereinafter, the sound-producing device 28L, which produces sound in the low-frequency range, will be described in detail; descriptions and illustrations of the sound-producing device 28R may be omitted at times. Additionally, the structures of the sound-producing devices 28L and 28R included in the electronic keyboard instrument 1 are approximately symmetrical about the center of the electronic keyboard instrument 1 in the left-right direction.

[0020] like Figure 1 As shown, the shell 10, when viewed from above, has a roughly rectangular shape with its length along the left-right direction. Figure 2 As shown, the housing 10 is divided into an upper housing 14 and a lower housing 16. The upper housing 14 and the lower housing 16 are both formed of resin material.

[0021] Viewed from above, the upper housing 14 has a generally elongated rectangular shape with a hollow portion 14a for the keyboard 12 to be inserted. The upper housing 14 has a left portion 14L, a right portion 14R, a front portion 14F, and a rear portion 14B. The left portion 14L and the right portion 14R extend in the front-rear direction and are generally cuboid with openings at the bottom. The rear portion 14B extends in the left-right direction and is also generally cuboid with openings at the bottom. The left side of the rear portion 14B is connected to the rear right side of the left portion 14L. The right side of the rear portion 14B is connected to the rear left side of the right portion 14R. The top of the rear portion 14B, the top of the left portion 14L, and the top of the right portion 14R are slightly inclined in a downward direction from the rear to the front. Various operation switches 18, such as power switches, are arranged in the left-right direction at the central front of the top of the rear portion 14B. A volume knob 20 is provided on the left side of the operation switch 18. Speaker grilles (not shown) corresponding to the speakers 62L and 62R described later are respectively provided on the upper left and right sides of the rear part 14B. The front part 14F has an upper main surface and a lower main surface, and is plate-shaped extending in the left-right direction. The left end of the front part 14F is connected to the front end of the right side of the left part 14L. The right end of the front part 14F is connected to the front end of the left side of the right part 14R. The lower surfaces of the left part 14L, the right part 14R, and the rear part 14B are on the same surface as the lower main surface of the front part 14F.

[0022] like Figure 2 As shown, on the left side of the rear portion 14B, there are upper protrusions 38La, 38Lb, and 38Lc for integrally fixing the upper housing 14, lower housing 16, and sound-generating device 28L. The upper protrusions 38La, 38Lb, and 38Lc protrude downwards from the inner side of the rear portion 14B, forming a roughly frustum-shaped cone that narrows downwards. The upper protrusions 38La, 38Lb, and 38Lc have hollow portions that engage with fixing screws 46. More specifically, as... Figure 8As shown, the outer edge of the lower end of the upper protrusion 38Lc is cut into a ring shape, and a protrusion 38Lc1 is formed at the lower end. The upper protrusions 38La and 38Lb have the same shape as the upper protrusion 38Lc. The upper protrusion 38Lc is located at a position corresponding to the housing fixing hole 48c of the storage part 54L (described later) and the lower protrusion 44c (described later). The upper protrusions 38La and 38Lb are located at positions corresponding to the housing fixing holes 48a and 48b of the sound part 56L (described later) and the lower protrusions 44a and 44b (described later), respectively. On the right side of the rear part 14B, upper protrusions 38Ra, 38Rb, and 38Rc are provided for integrally fixing the upper housing 14, the lower housing 16, and the sound-generating device 28R. The shape and position of the upper protrusions 38Ra, 38Rb, and 38Rc are the same as those of the upper protrusions 38La, 38Lb, and 38Lc, so their description is omitted.

[0023] like Figure 2 and Figure 3 As shown, the lower housing 16 has a bottom surface 16B that is generally elongated rectangular in shape and extends in the left-right direction when viewed from above, and a side surface 16S that extends upward from the outer edge of the bottom surface 16B. The boundary between the bottom surface 16B and the side surface 16S has a curved shape. The upper end of the side surface 16S fits into the lower end of the upper housing 14, and the upper housing 14 and the lower housing 16 are integrated.

[0024] like Figure 2 and Figure 3 As shown, a keyboard 12, control boards 26L and 26R, and sound-producing devices 28L and 28R are disposed inside the lower housing 16. The keyboard 12 is located at the front of the lower housing 16. The sound-producing devices 28L and 28R are located at the left and right rear corners of the lower housing 16, respectively. The sound-producing device 28L includes a sound-producing component 28L1 and a support frame 30L. The sound-producing device 28R includes a sound-producing component 28R1 and a support frame 30R. The sound-producing component 28R1 and the support frame 30R are joined without gaps. The control boards 26L and 26R are arranged side by side from left to right between the sound-producing devices 28L and 26R. A known key mechanism is disposed in the space between the keyboard 12 and the lower housing 16. This key mechanism is used to achieve key spacing and tone close to that of a real piano when the player presses the keys of the keyboard 12.

[0025] like Figure 4 As shown, the bottom surface 16B has an upper main surface 16B1 and a lower main surface 16B2. (As...) Figure 10As shown, a handle 22, rubber feet 24, and ports 50R and 50L (described later) are provided on the lower main surface 16B2. The handle 22 is located at the center of the rear end of the lower main surface 16B2. Viewed from below, the handle 22 is a roughly elongated rectangle with its length along the left-right direction and is recessed. The rubber feet 24 are flat, roughly cylindrical, and protrude downwards. Multiple rubber feet 24 are arranged at approximately equal intervals along the front and rear ends of the lower main surface 16B2. The rubber feet 24 contact the mounting surface (not shown) and support the housing 10. Therefore, a space is created between the lower main surface 16B2 and the mounting surface. Ports 50R and 50L are arranged symmetrically on either side of the handle 22.

[0026] like Figures 3-5 As shown, a support frame 30L is provided at the upper left corner of the upper main surface 16B1. The support frame 30L supports the sound-generating component 28L1 and is fixed in a way that does not create gaps. The support frame 30L is box-shaped with an opening at the top. Specifically, the support frame 30L is formed by a plate-like component erected from the upper main surface 16B1 and the upper main surface 16B1 surrounded by the plate-like component. Viewed from above, it is a roughly long rectangle with the left-right direction as its length direction. A plurality of U-shaped grooves 16B1d extending in the left-right direction are provided on the upper main surface 16B1. The U-shaped grooves 16B1d are formed by being recessed downward into a U-shape. More specifically, the U-shaped grooves 16B1d are concave in a shape with an arc-shaped cross section orthogonal to the left-right direction. Moreover, a slightly upward-protruding pipe rib 68 is provided on the upper main surface 16B1. The pipe rib 68 has a right rib 68R, a front rib 68F, and a rear rib 68B, and when viewed from above, it has a roughly U-shaped opening at the left end. The pipe rib 68 is located in a position corresponding to the enclosure wall 64 described later. The port 50L, described later, is located at the right end inside the pipe rib 68. (As...) Figure 5 as well as Figure 7 As shown, mounting holes 32LF, 32LB, 32RF, 32RB, 32CF, 32CB, 34LF, 34LB, 34RF, and 34RB are provided on the inner side of the support frame 30L for fixing the sound-generating component 28L1. The mounting holes 32LF, 32LB, 32RF, 32RB, 32CF, 32CB, 34LF, 34LB, 34RF, and 34RB are cylindrical, protruding upwards from the upper main surface 16B1, and have a hollow portion for screwing into the mounting screw 36. More specifically, as shown in Figure 6, the mounting holes 32LF, 32LB, 32RF, 32RB, 32CF, and 32CB are located at positions corresponding to the mounting holes 40LF, 40LB, 40RF, 40RB, 40CF, and 40CB of the port connection portion 52L, which will be described later. The mounting holes 34LF, 34LB, 34RF, and 34RB are located at positions corresponding to the mounting holes 42LF, 42LB, 42RF, and 42RB of the audio section 56L, which will be described later.

[0027] In addition, such as Figure 5 As shown, lower protrusions 44a, 44b, and 44c are provided on the inner side of the support frame 30L to integrally fix the upper housing 14, the lower housing 16, and the sound-generating device 28L. Specifically, the lower protrusions 44a, 44b, and 44c fix the support frame 30L and the sound-generating component 28L1. The lower protrusions 44a, 44b, and 44c protrude upward from the upper main surface 16B1, forming a roughly frustum-shaped cone that narrows upward, such as... Figure 8 As shown, it has a hollow portion through which a fixing screw 46 is inserted. The outer edges of the upper ends of the lower protrusions 44a, 44b, and 44c are cut into annular shapes.

[0028] The lower protrusion 44a is located at a position corresponding to the housing fixing hole 48a of the upper protrusion 38La and the housing fixing hole 48a of the storage part 54L (described later). The lower protrusions 44b and 44c are located at positions corresponding to the sound part 56L. More specifically, the lower protrusions 44b and 44c are located at positions corresponding to the housing fixing holes 48b and 48c of the upper protrusions 38Lb and 38Lc and the sound part 56L (described later). Through the lower protrusions 44b and 44c, the upper housing 14, the lower housing 16, and the sound-emitting device 28L can be more securely and integrally fixed to the sound part 56L, which expands in the left-right direction. In addition, as Figure 7 As shown, the lower protrusions 44a, 44b, and 44c are arranged sequentially from right to left along the left-right axis Ax. Therefore, during the process of integrating the upper housing 14, the sound-generating component 28L1, the support frame 30L, and the lower housing 16 using fixing screws 46, the operator can easily insert the fixing screws 46 through the lower protrusions 44a, 44b, and 44c, improving work efficiency.

[0029] like Figure 7 As shown, the lower protrusion 44a is positioned near the rear-end vertical hole 32RB, avoiding the central portion of the support frame 30L in the front-rear direction, in a manner that does not connect with the front-rear axis Ay1 of the vertical hole 32LF and the vertical hole 32LB. Therefore, the storage area 54LA (see below) Figure 9 The connection between the storage area 54LA and the pipe 58L is not easily obstructed. In other words, air vibrations can be smoothly transmitted from the storage area 54LA to the pipe 58L.

[0030] The lower protrusion 44b is positioned near the rear-end vertical hole 34RB, avoiding contact with the front-rear axis Ay2 connecting the vertical holes 34RF and 34RB, and also avoiding the center of the support frame 30L in the front-rear direction. This ensures that the communication between the sound area 56LA and the storage area 54LA (described later) is not easily obstructed. In other words, air vibrations can be smoothly transmitted between the sound area 56LA and the storage area 54LA.

[0031] like Figure 8As shown, a fixing screw 46, inserted from below into the hollow portion of the lower protrusion 44c, engages with the hollow portion of the upper protrusion 38Lc via a housing fixing hole 48c (described later). Therefore, with the sound-generating device 28L sandwiched between the upper housing 14 and the lower housing 16, the upper housing 14 and the lower housing 16 are integrally fixed. Specifically, the lower protrusion 44c fixes the support frame 30L and the speaker unit 56L. More specifically, with the protrusion 38Lc1 of the upper protrusion 38Lc inserted into the hollow portion of the lower protrusion 44c via the housing fixing hole 48c, the upper housing 14, the sound-generating device 28L, and the lower housing 16 are integrated by the fixing screw 46. Similarly, a fixing screw 46, inserted from below into the hollow portion of the lower protrusion 44a, engages with the hollow portion of the upper protrusion 38La via the housing fixing hole 48a. The fixing screw 46, which is inserted from below into the hollow part of the lower protrusion 44b, is screwed into the hollow part of the upper protrusion 38Lb via the housing fixing hole 48b.

[0032] A port 50L is provided on the right side of the inner side of the support frame 30L. The storage area 54LA is located between the port 50L and the audio area 56LA, which will be described later. Thus, the port 50L is located separately from the audio area 56LA. Multiple circular holes penetrating the bottom surface 16B in the vertical direction are arranged in a matrix on the port 50L.

[0033] like Figure 5 As shown in Figure 6, the sound-generating components 28L1 and 28R1, when viewed from above, are approximately rectangular in shape with their length along the left-right direction. Sound-generating component 28L1 is mounted on a support frame 30L erected at the upper left corner of the upper main surface 16B1. Sound-generating component 28L1 includes a port connection portion 52L, a storage portion 54L, and a sound source portion 56L. The port connection portion 52L, the storage portion 54L, and the sound source portion 56L are integrally formed, that is, they are formed seamlessly from the same component without being joined, and are arranged sequentially from right to left to form sound-generating component 28L1. Sound-generating component 28R1 is mounted on a support frame 30R erected at the upper right corner of the upper main surface 16B1. Sound-generating component 28R1 includes a port connection portion 52R, a storage portion 54R, and a sound source portion 56R. The port connection part 52R, the storage part 54R and the speaker part 56R are integrally formed and arranged from left to right to form the sound-emitting component 28R1.

[0034] As shown in Figure 6, viewed from above, the port connection portion 52L has a generally rectangular upper surface 52L1 extending in the left-right direction, a generally cuboid recess 52LP recessed downwards from the inside of the upper surface 52L1, and a surrounding wall 64. More specifically, the recess 52LP has: a bottom surface 52LB having a left short side, a right short side, a front long side, and a rear long side; and a left side surface, a right side surface, a front side surface, and a rear side surface, which extend upwards from the sides of the bottom surface 52LB and connect to the upper surface 52L1. Therefore, the cross-sectional shape of the port connection portion 52L perpendicular to the left-right direction is concave. Six mounting holes 40LF, 40LB, 40RF, 40RB, 40CF, and 40CB extending vertically through the upper surface 52L1 are provided. Mounting hole 40LF is located at the left front corner of the upper surface 52L1, mounting hole 40LB is located at the left rear corner, 40RF is located at the right front corner, and 40RB is located at the right rear corner. Mounting hole 40CF is located approximately in the center between mounting holes 40LF and 40RF, and mounting hole 40CB is located approximately in the center between mounting holes 40LB and 40RB. Figure 5 As shown, mounting screws 36, inserted from above into mounting holes 40LF, 40LB, 40RF, 40RB, 40CF, and 40CB, respectively engage with vertical mounting holes 32LF, 32LB, 32RF, 32RB, 32CF, and 32CB provided within the support frame 30L. Thus, the port connection portion 52L is mounted to the support frame 30L. More specifically, the lower outer edge of the upper portion 52L1 is mounted and fixed to the upper end of the support frame 30L. An elastic sealing material is adhered to the mating surface between the lower outer edge of the upper portion 52L1 and the upper end of the support frame 30L. Except for the surface communicating with the port 50L and the receiving area 54LA located on the left end (described later), the space formed by the port connection portion 52L and the support frame 30L is sealed. The recess 52LP is received within the support frame 30L. Furthermore, a control board 26L is mounted on the port connection portion 52L. The control board 26L outputs electrical signals to the speaker 62L based on the player's input of the operation of the keyboard 12.

[0035] The port connection part 52L has multiple cable clips 60. Each cable clip 60 is a plate-shaped component with a left main surface and a right main surface, protruding upwards. A cutout 60S is provided at the upper center of the cable clip 60 in the front-rear direction, pointing downwards. More specifically, as... Figure 5 and Figure 6AAs shown, viewed from above, the port connection portion 52L has five wiring clips 60 arranged at approximately equal intervals in the left-right direction and in the center in the front-back direction. Three of the wiring clips 60 are located on the bottom surface 52LB. Two of the wiring clips 60 are located on the left and right sides of the top surface 52L1, respectively. Wiring (not shown) connecting the speaker 62L (described later) to the control board 26L is inserted through the cutouts 60S. This suppresses wiring interference with the upper housing 14, keyboard 12, etc.

[0036] like Figure 6B As shown, the enclosure 64 protrudes downward from the outside of the bottom surface 52LB. More specifically, the enclosure 64 protrudes downward along the outer edge (right short side, front long side, and rear long side) of the bottom surface 52LB. Therefore, the enclosure 64 has a right wall portion 64RS, a front wall portion 64FS, and a rear wall portion 64BS, which, when viewed from below, has a roughly U-shaped opening at the left end. An elastic sealing material is adhered to the lower ends of the right wall portion 64RS, the front wall portion 64FS, and the rear wall portion 64BS. Furthermore, the enclosure 64 joins with the pipe rib 68 to form the pipe 58L. The pipe 58L is a flattened cylindrical shape extending in the left-right direction, with an opening at the left end. Specifically, the lower ends of the right wall portion 64RS, the front wall portion 64FS, and the rear wall portion 64BS join with the upper ends of the right rib 68R, the front rib 68F, and the rear rib 68B, respectively, to form the pipe 58L. Thus, the pipe 58L is composed of the enclosure 64 and the pipe rib 68. In other words, the conduit 58L is located further below the lower ends (below the opening) of the storage section 54L and the sound section 56L, which will be described later. A portion of the conduit 58L is formed by a part of the sound-emitting component 28L1. The port 50L is located at the right end inside the conduit 58L. In other words, the conduit 58L has a downward-opening port 50L on the opposite side from the side connected to the storage area 54LA, which will be described later. The conduit 58L, except for the port 50L and the opening at the left end, forms a closed space.

[0037] The storage section 54L is box-shaped with openings on the bottom and left side. More specifically, viewed from above, the storage section 54L has: a top surface 54L1, which is a generally elongated rectangle with a short right side, a long front side, and a long rear side; and a right side surface 54L2, a front side surface 54L3, and a rear side surface 54L4, which extend downwards from the sides of the top surface 54L1. The lower end of the right side surface 54L2 of the storage section 54L is connected to the left end of the top surface 52L1 of the port connection section 52L. The storage section 54L is mounted and fixed to the support frame 30L. More specifically, the lower ends of the front side surface 54L3 and the rear side surface 54L4 of the storage section 54L are joined to the upper ends of the support frame 30L. Thus, a storage area 54LA is formed, surrounded by the top surface 54L1, the right side surface 54L2, the front side surface 54L3, the rear side surface 54L4 of the storage section 54L, and the support frame 30L. A resilient sealing material is adhered to the mating surfaces of the lower ends of the front side 54L3 and the rear side 54L4 and the upper end of the support frame 30L. Thus, the storage area 54LA is sealed except for the surface communicating with the conduit 58L located at the right end and the surface communicating with the audio area 56LA located at the left end (described later). The opening of the conduit 58L is located near the lower right of the storage area 54LA. In other words, the left end of the conduit 58L connects to the storage area 54LA. Therefore, the conduit 58L connects the storage area 54LA to the port 50L. The storage area 54LA communicates with the outside of the lower housing 16 via the conduit 58L and the port 50L.

[0038] The housing 54L houses the speaker 62L within the housing area 54LA. Therefore, by placing the housing 54L on the support frame 30L, a housing space 54LS is formed that houses the speaker 62L corresponding to the housing area 54LA. The speaker 62L consists of a diaphragm 62L1, a magnet 62L2, and a voice coil (not shown). The diaphragm 62L1 is frustoconical in shape, having a top, bottom, inner, and outer surface, narrowing from top to bottom. The top of the diaphragm 62L1 is open, formed by the boundary between the inner and outer surfaces. When viewed from above, the top of the diaphragm 62L1 is approximately a long rectangle with its length along the left-right direction, and has outwardly bulging arcs on the left and right sides. The magnet 62L2 is a flattened cylinder with a top and bottom orthogonal to the vertical direction. The top of the magnet 62L2 contacts the bottom of the diaphragm 62L1. When viewed from above, the center of the diaphragm 62L1 overlaps with the center of the magnet 62L2. The voice coil is located in the upper center of the embedded magnet 62L2.

[0039] The inner surface of the diaphragm 62L1 is exposed from the top 54L1. Specifically, the opening of the diaphragm 62L1 is mounted on the top of the sound-emitting hole 54L1H that runs vertically through the top 54L1. The sound-emitting hole 54L1H has a shape that is approximately the same as the top of the diaphragm 62L1 described later. The lower, inner, and outer surfaces of the diaphragm 62L1, which are located below the top, are located within the housing area 54LA. The loudspeaker 62L receives electrical signals from the control board 26L and emits sound upward from the diaphragm 62L1.

[0040] like Figure 6A As shown, a housing fixing hole 48a is provided on the lower rear part of the right side 54L2 of the storage section 54L, extending vertically through the storage section 54L. In other words, viewed from above, the housing fixing hole 48a is located to the left front of the mounting hole 40LB.

[0041] like Figure 4 As shown in Figure 6, the speaker unit 56L is box-shaped with openings on the right and bottom. The rear left corner of the speaker unit 56L is chamfered at approximately 45 degrees. More specifically, viewed from above, the speaker unit 56L has: a top surface 56L1, which is a roughly rectangular shape with a short left side, a long front side, and a long rear side; a left side surface 56L2, which extends downward from the short left side; a front side surface 56L3, which extends downward from the long front side; and a rear side surface 56L4, which extends downward from the long rear side. An opening is formed on the right side of the top surface 56L1, the front side surface 56L3, and the rear side surface 56L4. This right side of the opening connects to the left side of the opening of the storage unit 54L. Therefore, the top surface 54L1 and the top surface 56L1, the front side surface 54L3 and the front side surface 56L3, and the rear side surface 54L4 and the rear side surface 56L4 are all on the same surface.

[0042] The speaker unit 56L is mounted and fixed to the support frame 30L. More specifically, the lower ends of the left side 56L2, the front side 56L3, and the rear side 56L4 are joined to the upper end of the support frame 30L. Therefore, as Figure 9As shown, an audio region 56LA extending in the left-right direction is formed by the upper surface 56L1, left side surface 56L2, front side surface 56L3, rear side surface 56L4 of the audio unit 56L, and the support frame 30L. Therefore, by placing the audio unit 56L on the support frame 30L, an audio space 56LS corresponding to the audio region 56LA is formed. More specifically, the audio region 56LA includes lower protrusions 44b and 44c. The audio region 56LA is located on the left side of the generally frustum-shaped outer surface of the lower protrusion 44b, which narrows upwards, and on the left side of the concave frustum-shaped outer surface that narrows downwards from the upper surface 56L1 in a manner that surrounds the housing fixing hole 48b. An elastic sealing material is adhered to the mating surfaces of the lower ends of the left side surface 56L2, the front side surface 56L3, and the rear side surface 56L4 with the upper end of the support frame 30L. Thus, the audio region 56LA is sealed except for the surface that communicates with the storage region 54LA located at the right end.

[0043] Thus, the speaker area 56LA and the conduit 58L are symmetrically arranged on the left and right sides of the storage area 54LA. The storage area 54LA and the speaker area 56LA are interconnected, forming a connected, integrated space. Therefore, the speaker area 56LA is connected to the outside of the lower housing 16 via the storage area 54LA, the conduit 58L, and the port 50L. In other words, the port 50L is connected to the speaker area 56LA via the conduit 58L and the storage area 54LA. Figure 9 As shown by the dashed arrow, the bass emitted from the outside of the diaphragm 62L1 is transmitted from the receiving area 54LA to the sound area 56LA, where it resonates. Furthermore, the bass resonating in the sound area 56LA is transmitted from the receiving area 54LA to the conduit 58L, and emitted downwards from the port 50L. Additionally, on the inner surface of the front side 56L3, rod-shaped ribs 66F1, 66F2, and 66F3 extending from the top to the bottom are evenly arranged along the vertical axis in the left-right direction. On the inner surface of the rear side 56L4, rod-shaped ribs 66B1, 66B2, and 66B3 extending from the top to the bottom are evenly arranged along the vertical axis in the left-right direction.

[0044] Four mounting holes 42LF, 42LB, 42RF, and 42RB, running vertically through the four corners of the speaker unit 56L, are provided. These mounting holes 42LF, 42LB, 42RF, and 42RB are located at the left front corner, left rear corner, right front corner, and right rear corner of the speaker unit 56L, respectively. Mounting screws 36, inserted from above into the mounting holes 42LF, 42LB, 42RF, and 42RB, engage with the vertical mounting holes 34LF, 34LB, 34RF, and 34RB located on the left side of the support frame 30L, as described later. Thus, the speaker unit 56L is mounted to the support frame 30L. More specifically, the lower end of the speaker unit 56L engages with the upper right side of the support frame 30L.

[0045] like Figure 4 As shown in Figure 6, a housing mounting hole 48b and 48c are provided on the hollow, frustoconical bottom section that narrows downwards from the inner side of the upper part 56L1. The housing mounting holes 48b and 48c are located on the right rear and left rear parts of the audio section 56L, respectively. More specifically, viewed from above, the housing mounting holes 48b and 48c are located near the left front of the mounting hole 42RB and near the left front of the mounting hole 42LB, respectively.

[0046] Next, the function and effect of the sound-producing device 28L will be explained. In the above structure, when the performer operates the keyboard 12, such as Figure 9 As indicated by the hollow arrow, sound is emitted upwards from the top of the opening of the diaphragm 62L1 of the speaker 62L. Simultaneously, as shown by the dashed arrow, bass frequencies are emitted from the outside of the diaphragm 62L1 of the speaker 62L. This bass frequency is transmitted to the acoustic region 56LA via the reception area 54LA. The bass frequency is then transmitted back to the reception area 54LA and emitted from the port 50L to the outside of the lower housing 16 via the conduit 58L. This results in enhanced bass. Furthermore, due to the space formed between the lower main surface 16B2 of the lower housing 16 and the mounting surface, air vibrations can be emitted without obstruction.

[0047] According to this embodiment, the acoustic region 56LA is provided adjacent to the outer side of the storage region 54LA of the speaker 62L in the left-right direction. Therefore, the storage region 54LA does not need to maintain a volume for bearing bass resonance. As a result, the vertical length of the storage region 54LA can be reduced to a length that can accommodate the speaker 62L. Furthermore, by making the vertical length of the acoustic region 56LA consistent with the horizontal expansion of the storage region 54LA, miniaturization of the electronic keyboard instrument 1 can be achieved. Specifically, the vertical length of the housing 10 can be reduced to achieve a thinner profile.

[0048] The resonance effect is achieved through the configuration of the acoustic region 56LA, the conduit 58L, and the port 50L. Specifically, when sound is emitted upwards from the speaker 62L according to the player's operation of the keyboard 12, the bass resonating in the acoustic region 56LA is simultaneously emitted downwards from the port 50 via the receiving region 54LA and the conduit 58L, enhancing the resonance effect. The bass emitted downwards from the port 50 is in phase with the bass emitted upwards from the speaker 62L. Therefore, interference caused by phase difference is suppressed, and bass is enhanced. The sound-emitting device 28L enables miniaturization (thinning) of the housing 10 and improves bass playback capability.

[0049] The speaker area 56LA has sufficient capacity by expanding in the left-right direction. Furthermore, the receiving area 54LA, located between the speaker area 56LA and the port 50L, extends the distance between them. This increases the flow resistance from the speaker area 56LA to the port 50L, and increases the elasticity of the air passing through the port 50L. This results in better resonance and improved bass response. Moreover, the increased distance between the speaker area 56LA and the port 50L allows for greater freedom in adjusting the position of the port 50L according to the performance of the speaker 62L, leading to better bass sound quality.

[0050] The lower protrusions 44a and 44b, located within the support frame 30L, are positioned away from the center of the support frame 30L in the front-rear direction, and are respectively positioned near the vertical mounting holes 32RB and 34LB at the rear end. This ensures that the connection between the speaker area 56LA and the storage area 54LA is not easily obstructed, allowing for smooth transmission of air vibrations between them. This, in turn, improves bass response.

[0051] Thus, based on the sound-generating device 28L, the electronic keyboard instrument 1 can be miniaturized (thinned), improving bass reproduction capability. Furthermore, the sound-generating device 28R has the same function and effect as the sound-generating device 28L. Moreover, the storage area 54LA does not bear the function of bass resonance, and therefore is not affected by its positional relationship with the port 50L. By increasing the flexibility of the layout of the storage area 54LA, the stored speaker 62L can be placed in an appropriate position. Therefore, regardless of bass levels, the sound reproduction capability is improved.

[0052] The port connection portion 52L, the storage portion 54L, and the speaker portion 56L are integrally molded to form the sound-generating component 28L1. The port connection portion 52L has a surrounding wall 64, and the lower end of the surrounding wall 64 is joined to the upper end of the pipe rib 68 by placing the port connection portion 52L on the support frame 30L to form the pipe 58L. That is, the surrounding wall 64, which is part of the sound-generating component 28L1, forms part of the pipe 58L. Moreover, the pipe 58L is constituted by the surrounding wall 64, which is part of the sound-generating component 28L1, and the pipe rib 68, which is part of the lower housing 16. As a result, compared to using a separate plate-shaped component to form the pipe 58L, the manufacturing cost can be reduced.

[0053] Furthermore, the lower protrusions 44a, 44b, and 44c, located within the support frame 30L, are arranged along the left-right axis Ax. This allows operators to easily insert the fixing screws 46 through the lower protrusions 44a, 44b, and 44c during the process of integrating the upper housing 14, the sound-generating component 28L1, and the lower housing 16 using the fixing screws 46, thus improving work efficiency. This, in turn, reduces manufacturing costs.

[0054] Furthermore, multiple U-shaped grooves 16B1d extending in the left-right direction are provided on the upper main surface 16B1 within the support frame 30L. This effectively transmits vibrations of the air within the duct 58L leading to the port 50L, thus improving bass response.

[0055] On the inner surfaces of the front side 56L3 and rear side 56L4 of the speaker section 56L, rod-shaped ribs 66F1, 66F2, 66F3, 66B1, 66B2, and 66B3 extending from the top to the bottom are evenly arranged along the vertical axis in the left-right direction. This increases the bending strength of the speaker section 56L relative to the vertical direction, even though it expands in the left-right direction, resulting in a stable resonance effect and improved bass response.

[0056] A control board 26L is mounted on the port connection portion 52L. As a result, the sound-generating device 28L and the control board 26L are integrated, improving the efficiency of the assembly process of the electronic keyboard musical instrument 1 and reducing manufacturing costs.

[0057] Because bass frequencies have a diffraction characteristic greater than treble frequencies, in conventional sound-generating devices, the sound generated from the sound hole is diffracted, resulting in interference between the sound emitted from the back of the speaker and the sound emitted from the front of the speaker, making it difficult to completely ensure bass frequencies. However, in this embodiment, interference caused by phase difference can be suppressed, thereby enhancing bass frequencies.

[0058] Furthermore, the port connection section 52L and the speaker section 56L can be interchanged in their left-right position relative to the storage section 54L. The port connection section 52R and the speaker section 56R can also be interchanged in their left-right position relative to the storage section 54R.

[0059] The resonance effect is achieved through the configuration of the acoustic region 56LA, the conduit 58L, and the port 50L. Specifically, when sound is emitted upwards from the speaker 62L according to the player's operation of the keyboard 12, the bass resonating in the acoustic region 56LA is simultaneously emitted downwards from the port 50 via the receiving region 54LA and the conduit 58L, enhancing the resonance effect. The bass emitted downwards from the port 50 is in phase with the bass emitted upwards from the speaker 62L. Therefore, interference caused by phase difference is suppressed, and bass is enhanced. The sound-emitting device 28L enables miniaturization (thinning) of the housing 10 and improves bass playback capability.

[0060] The embodiments described above are provided as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. The embodiments of the present invention and their variations are included within the scope and spirit of the present invention, and are included within the scope of the invention as described in the claims and its equivalents.

Claims

1. A sound-generating device, characterized in that, have: A box-shaped support frame with an opening at the top; and The sound-generating component is integrally formed and mounted on the support frame. The speaker is housed in a storage space formed by the sound-generating component and the support frame; an acoustic space connected to the storage space is also included; and a conduit is connected to the storage space. The acoustic space is a space corresponding to a region containing multiple upwardly projecting downward protrusions, which are arranged in a left-right direction and fix the support frame and the sound-producing component. The support frame has a port with an opening at a position corresponding to the pipe.

2. The sound-generating device according to claim 1, wherein, The support frame has multiple upward-protruding upright holes and multiple downward protrusions inside. The erection holes are located in pairs along the front and rear axes within the support frame at the front and rear ends, and are arranged at predetermined intervals in the left and right directions. The lower protrusion is positioned near the erection hole in a manner that does not contact the front and rear axes.

3. The sound-generating device according to claim 2, wherein, The lower protrusions are arranged at specified intervals along the same left-right axis.

4. The sound-generating device according to claim 1, wherein, A portion of the sound-generating component forms part of the conduit.

5. The sound-generating device according to claim 4, wherein, The sound-generating component has a downwardly protruding enclosure. The support frame has upwardly projecting pipe ribs. The pipe is formed within the support frame by the engagement of the lower end of the enclosure wall with the upper end of the pipe rib.

6. The sound-generating device according to claim 5, wherein, A U-shaped groove extending in the left-right direction is provided on the upper main surface inside the support frame.

7. The sound-generating device according to claim 6, wherein, A control board is provided for outputting signals to the loudspeaker and is integrated with the sound-generating component.

8. The sound-generating device according to claim 7, wherein, Multiple ribs extending from the top to the bottom are provided on the inner surfaces of the front and rear sides of the box-shaped speaker unit, which is placed on the support frame and constitutes the acoustic space.

9. An electronic keyboard musical instrument comprising the sound-generating device according to any one of claims 1 to 8.

10. The electronic keyboard musical instrument according to claim 9, wherein, The pipe is located further inside than the storage space, and the speaker space is located further outside than the storage space.

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