Speaker housing

Abstract

A speaker housing capable of suppressing distortion degradation is provided. The speaker housing of the present invention is a speaker housing (3) that accommodates a speaker unit (2). By arranging a first rib (30e) or / and a second rib (31d) whose distance from the speaker unit (2) continuously changes inside the speaker housing (3), the distance between the speaker unit (2) and the first rib (30e) or / and the second rib (31d) becomes non-fixed, so that resonance is dispersed and no significant resonance occurs, thereby suppressing distortion degradation.

Description

Technical Field

[0001] The present invention relates to a speaker housing accommodating a speaker unit. Background Art

[0002] In a speaker system, the vibration of the unit generates sound, which is transmitted to the speaker box and generates unnecessary sound. In the speaker housing, ribs are sometimes provided to reduce distortion without increasing thickness and weight. In this case, if concentric ribs are provided with the center of the speaker unit as in the reinforcing rib 26F provided on the frame of Patent Document 1, the distance from the unit to the rib becomes fixed, and the resonance is concentrated on a certain fixed frequency, resulting in a problem of distortion degradation.

[0003] Patent Document 1: Re-Table 2013 / 190824 Summary of the invention

[0004] An object of the present invention is to provide a speaker housing capable of suppressing distortion degradation.

[0005] In order to achieve the above object, a speaker housing of the present invention is a speaker housing that accommodates a speaker unit, and a rib whose distance from the speaker unit continuously changes is provided inside the speaker housing.

[0006] Preferably, in the speaker housing of the present invention, the speaker housing includes a housing body and a bottom plate, the speaker unit is provided between the housing body and the bottom plate, and the rib is provided on either or both of the housing body and the bottom plate.

[0007] Furthermore, preferably, in the speaker housing of the present invention, the rib is provided in a spiral shape with the speaker unit as the center.

[0008] According to the speaker housing of the present invention, the speaker housing of the present invention is a speaker housing that accommodates a speaker unit. By providing ribs whose distance relative to the speaker unit continuously changes inside the speaker housing, the distance from the speaker unit to the ribs becomes non-fixed, so that the resonance is dispersed and no significant resonance occurs, thereby being able to suppress distortion degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a perspective view showing a speaker system according to one embodiment of the present invention.

[0010] Figure 2 yes Figure 1 Cross-sectional view along line AA.

[0011] Figure 3 It is a bottom view of the shell body.

[0012] Figure 4 This is a top view of the base plate.

[0013] Figure 5 It is a frequency characteristic diagram.

[0014] Description of reference numerals:

[0015] 2: Speaker unit

[0016] 3: Speaker housing

[0017] 30e: First rib

[0018] 31d: Second rib DETAILED DESCRIPTION

[0019] Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Figure 1 is a perspective view of a speaker system having a speaker housing according to an embodiment of the present invention, Figure 2 yes Figure 1 The cross-sectional view of line AA, Figure 3 is a bottom view of the shell body. Figure 4 This is the front view of the base plate.

[0020] like Figure 1 and Figure 2 As shown, the speaker system 1 includes a speaker unit 2 for converting electricity into sound, and a speaker housing 3 for accommodating the speaker unit 2 .

[0021] The speaker unit 2 is an electrodynamic speaker unit, and includes a magnetic circuit 20, a voice coil 21, a vibration plate 22, and a frame 23, which supports and combines the drive system (magnetic circuit 20) and the vibration system (voice coil 21 and vibration plate 22). By supplying a drive current to the voice coil 22, the vibration system vibrates in the up-and-down direction, and the speaker unit 2 produces sound.

[0022] The speaker unit 2 is circular, and the magnetic circuit 20 , the voice coil 21 , the diaphragm 22 , and the frame 23 are each formed in a circular shape and assembled in a state where the centers of the respective components are aligned.

[0023] like Figures 1 to 4 As shown, the speaker housing 3 includes a housing body 30 and a bottom plate 31, each of which is formed by molding a synthetic resin.

[0024] The shell body 30 includes a low cylindrical main body portion 30a and a dome-shaped baffle portion 30b covering the upper opening of the main body portion 30a. A circular opening 30c is concentrically arranged in the central portion of the baffle portion 30b, and a plurality of protrusions 30d protruding downward are evenly spaced on the lower surface of the baffle portion 30b located around the opening 30c.

[0025] The bottom plate 31 includes a circular plate portion 31a, which covers the lower opening of the main body portion 30a of the shell body 30, and a cylindrical platform 31b protruding upward is concentrically arranged in the central part of the upper surface of the circular plate portion 31a, and a plurality of protrusions 31c protruding upward are evenly spaced on the upper surface of the circular plate portion 31a located around the platform 31b.

[0026] In the above structure, the speaker unit 2 is sandwiched between the shell body 30 and the bottom plate 31. When the centers of the speaker unit 2, the shell body 30 and the bottom plate 31 are aligned, more specifically, when the centers of the vibration system of the speaker unit 2, the baffle portion 30b of the shell body 30 and the circular plate portion 31a of the bottom plate 31 are aligned, the shell body 30 and the bottom plate 31 are fastened by a plurality of screws 32, and the disc-shaped speaker shell 3 is assembled while accommodating and holding the speaker unit 2 inside, thereby forming a speaker system 1.

[0027] At this time, the speaker unit 2 is placed on the platform 31b of the bottom plate 31, and the shell body 30 is covered on the circular plate portion 31a of the bottom plate 31, the opening 30c of the baffle portion 30b of the shell body 30 faces the vibration plate 22 of the speaker unit 2, and the inner peripheral edge portion (edge ​​portion of the opening 30c) of the baffle portion 30b of the shell body 30 faces the upper end portion of the frame 23 of the speaker unit 2, so that a circular ring 33 made of elastic material such as rubber is sandwiched between the inner peripheral edge portion of the baffle portion 30b of the shell body 30 and the upper end portion of the frame 23 of the speaker unit 2.

[0028] In addition, the lower end of the main body 30a of the shell body 30 faces the outer peripheral edge of the circular plate portion 31a of the bottom plate 31, so that an annular gasket 34 made of elastic material such as rubber is sandwiched between the outer peripheral edge of the circular plate portion 31a of the bottom plate 31 and the lower end of the main body 30a of the shell body 30.

[0029] In addition, the lower end portions of each protrusion 30d of the baffle portion 30b of the shell body 30 face the upper end portions of each protrusion 31c of the circular plate portion 31a of the bottom plate 31, so that a cylindrical elastic body 35 made of elastic material such as rubber is sandwiched between the upper end portions of the protrusion 31c of the circular plate portion 31a of the bottom plate 31 and the lower end portions of the protrusion 30d of the baffle portion 30b of the shell body 30.

[0030] The screws 32 are inserted from the lower surface side of the bottom plate 31 into the respective protrusions 31 c of the circular plate portion 31 a of the bottom plate 31 , penetrate the elastic body 35 , and are screwed and fastened into the protrusions 30 d of the baffle portion 30 b of the housing body 30 .

[0031] Furthermore, a cylindrical elastic body 36 made of an elastic material such as rubber and also serving as a seal is sandwiched between the head of each screw 32 and the bottom plate 31 .

[0032] Then, if Figure 2 , Figure 3 As shown in the figure, in order to reduce distortion without increasing the thickness and weight of the speaker housing 3, a rib which is the key structure of the present invention is provided on the lower surface of the baffle portion 30b located around the opening 30c of the housing body 30, and the rib is a first rib 30e having a plate-like cross-sectional shape and protruding downward, which is a spiral shape centered on the center of the speaker unit 2, more specifically, the center of the vibration system of the speaker unit 2. That is, a rib whose distance from the speaker unit 2 continuously changes is provided inside the speaker housing 3.

[0033] In addition, if Figure 2 , Figure 4 As shown in the figure, in order to reduce distortion without increasing the thickness and weight of the speaker housing 3, a rib which is the key structure of the present invention is provided on the upper surface of the circular plate portion 31a around the platform 31b located on the bottom plate 31, and the rib is a second rib 31d having a plate-like cross-sectional shape and protruding upward, which is set in a spiral shape centered on the center of the speaker unit 2, more specifically, the center of the vibration system of the speaker unit 2. That is, a rib whose distance from the speaker unit 2 continuously changes is provided inside the speaker housing 3.

[0034] Figure 5 1 and 2 show the frequency characteristics of the speaker system 1 of the present embodiment and a conventional speaker system (not shown). Figure 5 , A1 is the sound pressure frequency characteristic of the speaker system 1 of the present embodiment, A2 is the sound pressure frequency characteristic of the conventional speaker system, B1 is the distortion rate frequency characteristic of the speaker system 1 of the present embodiment, and B2 is the distortion rate frequency characteristic of the conventional speaker system.

[0035] The difference between the existing speaker system and the speaker system 1 of the present embodiment is that the third rib and the fourth rib are provided instead of the first rib 30e and the second rib 31d in the speaker system 1 of the present embodiment, and the other structures are the same. The third rib is a rib having a plate-like cross-sectional shape and protruding downward on the lower surface of the baffle portion 30b located around the opening 30c of the housing body 30 in the existing speaker system, and the rib is provided in a concentric circle with the center of the speaker unit 2, more specifically, the center of the vibration system of the speaker unit 2. The fourth rib is a rib having a plate-like cross-sectional shape and protruding upward on the upper surface of the circular plate portion 31a located around the platform 31b of the bottom plate 31 in the existing speaker system, and the rib is provided in a concentric circle with the center of the speaker unit 2, more specifically, the center of the vibration system of the speaker unit 2.

[0036] In the sound pressure frequency characteristic A2 of the existing speaker system, there is a sharp drop in the range of 2kHz to 3kHz. This is because the speaker housing 3 of the existing speaker system is provided with the third and fourth ribs in a concentric circle centered on the center of the vibration system of the speaker unit 2, so the distance from the speaker unit 2 to each rib becomes fixed, so that the resonance is concentrated on a certain fixed frequency. Similarly, in the distortion frequency characteristic B2 of the existing speaker system, there is a peak of the distortion rate at the same frequency. In addition, it can be seen that there are also peaks of the distortion rate at other frequencies.

[0037] On the other hand, the sound pressure frequency characteristic A1 of the speaker system 1 of the present embodiment has a gentle curve, without extreme peaks and troughs, and without strong resonance. In addition, it can be seen that the distortion rate frequency characteristic B1 of the speaker system 1 of the present embodiment also has no extreme peaks and troughs, and no strong resonance. This is because the speaker housing 3 of the speaker system 1 of the present embodiment is provided with the first rib 30e and the second rib 31d whose distance relative to the speaker unit 2 continuously changes. More specifically, the first rib 30e and the second rib 31d are arranged in a spiral shape with the speaker unit 2 as the center, so the distance from the speaker unit 2 to each rib 30e, 31d is not fixed, so that the resonance is dispersed.

[0038] As described above, the speaker housing 3 of the speaker system 1 of the present embodiment is a speaker housing 3 that accommodates the speaker unit 2. By providing the first rib 30e and the second rib 31d whose distances relative to the speaker unit 2 continuously change inside the speaker housing 3, the distances from the speaker unit 2 to the first rib 30e and the second rib 31d are not fixed, so that the resonance is dispersed and no significant resonance occurs, thereby suppressing distortion degradation.

[0039] Furthermore, in the present embodiment, although ribs whose distance from the speaker unit 2 continuously changes are respectively provided on both the shell body 30 and the bottom plate 31 constituting the outer contour of the speaker shell 3, the ribs whose distance from the speaker unit 2 continuously changes may be provided only on either the shell body 30 or the bottom plate 31.

Claims

1. A speaker housing, accommodating a speaker unit, characterized in that: The speaker housing comprises a housing body and a bottom plate, wherein the speaker unit is arranged between the housing body and the bottom plate. A first rib is provided on the shell body, A second rib is provided on the bottom plate, The first rib and the second rib are arranged in the speaker housing in a spiral shape with the speaker unit as the center so that the distance from the speaker unit changes continuously.

2. The speaker housing according to claim 1, characterized in that The housing body includes: a cylindrical main body portion with a low height; a dome-shaped baffle portion covering an upper opening of the main body portion; and a circular opening concentrically provided in a central portion of the baffle portion; The first rib has a plate-like cross-sectional shape and protrudes downward from a lower surface of the baffle portion located around the opening.

3. The speaker housing according to claim 2, characterized in that The bottom plate includes: a circular plate portion, the circular plate portion covers the lower opening of the main body portion of the housing body; and a cylindrical platform, which is concentrically provided at the center of the upper surface of the circular plate portion and protrudes upward; The second rib has a plate-like cross-sectional shape and protrudes upward from the upper surface of the circular plate portion located around the stage of the bottom plate.

4. A speaker system, characterized in that: include: The speaker housing according to any one of claims 1 to 3, and The speaker unit is provided between the housing body and the bottom plate of the speaker housing.

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