JP2005005814A - Speaker system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker system capable of avoiding vibration caused in a speaker unit in the speaker apparatus itself from being delivered to a speaker box wherein it is not required to insert a stand up to the inside of the speaker box. <P>SOLUTION: A plurality of supports 12 extending radially from a main body part 11 of a weight 10 in the speaker box 3 separable into a first half and a latter half are fixed at a connection part 3a of the speaker box by using bolts 14. A drive unit 6 of the speaker unit 2 is coupled to the main body part 11 of the weight 10 and the main body part 11 of the weight 10 having a greater mass and acting like an imaginary ground can support the drive unit 6 of the speaker unit 2 in the inside of the speaker box 3 so as not to deliver the vibration to the drive unit 6. A pivotally support mechanism 18 pivotally supports the stand 9 and the speaker box 3 to attain oscillation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker device used for audio reproduction and the like.
[0002]
[Prior art]
Conventionally, in audio reproduction, a speaker device capable of high-quality sound reproduction in a wide frequency band has been demanded. In order to extend the frequency band to the low sound side, it is necessary to use a speaker device in which a large-diameter speaker is mounted in a large-volume speaker box. In the speaker, acoustic vibration is propagated to the surrounding air from a diaphragm that vibrates when driven by a drive unit such as an electrodynamic type equipped with a magnetic circuit and a voice coil. The reaction force from the surrounding air is transmitted to the diaphragm, and the drive unit also vibrates according to the acoustic vibration propagated to the air. This vibration is transmitted to the speaker box, the surface of the speaker box vibrates, and the sound output due to this vibration is also radiated to the surrounding air. Since this sound output is added with a phase shift or distortion as compared with the sound output radiated from the diaphragm, the sound quality of the sound output radiated from the speaker is impaired.
[0003]
The present applicant makes it possible to divide the speaker box into the first half and the second half, provide an opening in the first half, accommodate the speaker unit in the speaker box, and support the drive unit of the speaker unit in the space inside the speaker box. Discloses a speaker system in which an acoustic radiation portion of a speaker unit is connected to a first half opening of a speaker box via a cushioning material (see, for example, Patent Document 1). The speaker unit is directly supported by a stand whose tip is inserted into the speaker box from the connection portion between the first half and the second half of the speaker box, and vibration generated in the drive unit of the speaker unit is not easily transmitted to the speaker box. .
[0004]
[Patent Document 1]
JP 2001-285974 A (FIGS. 1 and 17)
[0005]
[Problems to be solved by the invention]
In the speaker system disclosed in Patent Document 1, the tip of a stand outside the speaker box is inserted into the speaker box to support the speaker unit. At the part where the stand is inserted into the speaker box, a shock absorber or the like is used to prevent the sound output inside the speaker box from leaking outside, so that the stand can be swung to the stand. Can not. When reproducing the high sound side, the directivity is strong in the sound output radiated from the speaker. When performing stereo reproduction by placing the speaker system at a spatially separated position such as left and right, it is preferable to point the speaker system toward the listener.
[0006]
An object of the present invention is to provide a speaker device that does not require the stand to be inserted into the speaker box and that prevents the speaker device itself from transmitting vibrations generated in the speaker unit to the speaker box.
[0007]
[Means for Solving the Problems]
In the present invention, the speaker unit is housed in a speaker box that can be divided into the first half and the second half, and an opening is provided in the first half, and the drive unit of the speaker unit is supported in the space inside the speaker box. In the speaker device formed by connecting the radiating portion to the opening of the first half of the speaker box via a buffer material, the speaker unit is connected to the back side of the driving unit of the speaker unit in the speaker box, and virtually serves as a ground for acoustic vibration. A main body having a mass capable of acting, and a weight including a plurality of support portions having a shape extending radially from the main body toward the connection portion between the first half and the second half of the speaker box;
A speaker device comprising: a connecting member of a speaker box; and a fixing member for fixing a weight supporting portion.
[0008]
According to the present invention, the speaker device supports the driving unit of the speaker unit in the speaker box that can be divided into the first half and the second half, and the sound radiating portion of the speaker unit is interposed in the opening of the first half of the speaker box via the buffer material. Connect. The vibration of the speaker unit itself caused by the reaction force that causes the speaker unit to propagate the sound output to the surrounding air is attenuated by the buffer material and is not easily transmitted to the speaker box. Inside the speaker box, the driving unit of the speaker unit is connected to the main body of the weight. Since the main body of the weight has a large mass that can virtually act as a ground for acoustic vibration, the acoustic radiation of the speaker unit is sufficiently high compared to the air that propagates the acoustic output, and the air Even if it receives a reaction force due to the radiation of the sound output to it, it hardly vibrates. A plurality of support portions having radially extending shapes extend from the main body portion of the weight toward the connection portion between the first half and the second half of the speaker box, and the fixing member is the connection portion of the speaker box, and the weight support portion is Since each is fixed, the weight can be supported inside the speaker box. A speaker unit drive unit is connected to the main body of the weight, and the speaker unit drive unit is supported inside the speaker box so that vibration is not transmitted by the main body unit of the weight that acts as a virtual ground. be able to. Even when using a stand or the like to separate the speaker box from the floor or wall of a room where sound is reproduced, it is not necessary to directly support the speaker unit by inserting the stand into the speaker box. It can also be swung with the box in a pivotal state.
[0009]
Further, in the present invention, the weight has the plurality of support portions in different shapes, and includes a display related to the difference in shape.
[0010]
According to the present invention, since the plurality of support portions of the weight have different shapes, it is possible to prevent the vibration frequency at which the support portion resonates from deviating and to prevent the vibration from increasing at a specific frequency. Since the display related to the difference in the shape of the support portion is provided, the fixing direction of the weight in the speaker box can be prevented from being mistaken even if the difference in shape is difficult to visually recognize. For example, when two-channel stereo reproduction is performed by arranging a pair of speaker devices on the left and right, the directions of the weights in the speaker device can be made different on the left and right.
[0011]
Further, in the present invention, the plurality of support portions of the weight are formed to extend from the outer periphery of the main body portion at equal intervals in the circumferential direction,
Each support portion is characterized in that the portion fixed by the fixing member at the connection portion of the speaker box has the same shape, and the shape of the portion extending from the main body portion is different.
[0012]
According to the present invention, the plurality of support portions are extended from the main body portion of the weight in the circumferential direction with substantially the same shape at equal intervals, and the shape of the portion extending from the main body portion is made different so that the resonance frequency is increased. Can be shifted. Since the portion fixed by the fixing member at the connecting portion between the front half portion and the rear half portion of the speaker box at the front end of the support portion can have the same shape, the fixing member having the same standard can be used.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a schematic side sectional configuration of a speaker device 1 according to an embodiment of the present invention. A speaker unit 2 that performs electroacoustic conversion in the speaker device 1 is housed in a generally egg-shaped speaker box 3. The speaker box 3 can be divided into a baffle 4 that is the first half and a box 5 that is the second half before and after the joint 3a. The baffle 4 is provided with an opening 4a. The drive unit 6 of the speaker unit 2 is supported in the space inside the speaker box 3, and the acoustic radiation unit 7 of the speaker unit is connected to the opening 4 a of the baffle 4 of the speaker box 3 via a cushioning material 8 such as felt or rubber. . A stand 9 is provided at the bottom of the speaker box 3, which is provided with a pivot mechanism and enables the speaker box to swing.
[0014]
In the speaker box 3, a weight 10 is connected to the back side of the drive unit 6 of the speaker unit 2. The weight 10 includes a main body portion 11 having a mass that can virtually act as a ground for acoustic vibration, and a plurality of support portions 12b. The mass of the main body 11 is approximately the same as that of the speaker unit 2 and functions as a ground anchor. The support portion 12 b has a shape that extends radially from the main body portion 11 toward the connection portion 3 a between the baffle 4 and the box 5 of the speaker box 3. In the connection portion 3a between the baffle 4 and the box 5 of the speaker box 3, the support portion 12 of the weight 10 is sandwiched between cushioning materials 13 such as felt and fixed with fixing members such as bolts 14, respectively.
[0015]
The speaker box 3 is formed by molding a synthetic resin material such as foamed polypropylene (PP). A hemispherical convex spherical surface 15 is integrally formed on one side of the speaker box 3, for example, the bottom of the baffle 4. A sliding contact member 16 having a concave spherical surface partially fitted on the surface of the convex spherical surface 15 and capable of being displaced by sliding contact with the convex spherical surface 15 is pressed against the convex spherical surface 15 by the outer shell member 17. The outer shell member 17 is formed with a groove 17a through which a connecting portion 16a extending radially outward from the surface of the sliding contact member 16 is passed. The distal end of the connecting portion 16a is connected to a stand 9 that can be placed on the floor or the like. If the bottom of the stand 9 is placed on the floor surface or the like, a swinging displacement between the convex spherical surface 15 covered by the outer shell member 17 and the sliding contact member 16 causes a swing to change the direction of the speaker box 3. The pivoting mechanism 18 is configured by the convex spherical surface 15, the sliding contact member 16 and the outer shell member 17.
[0016]
A net 19 can be attached to and detached from the opening 4a of the baffle 4 of the speaker box 3. If the net 19 is attached, the diaphragm of the sound radiating unit 7 of the speaker unit 2 can be protected from touching with a fingertip. can do. The net 19 is inserted and fixed together with the rubber ring 20 in an annular groove 4b provided around the opening 4a. The net 19 can also be removed by removing the rubber ring 20. On the back side of the speaker box 3, a hole 21 is provided, and a terminal 22 for electrically driving the speaker unit 2 is attached.
[0017]
A through hole 23 through which the bolt 14 is inserted is formed at the tip of the support portion 12 of the weight 10. The inner diameter of the through hole 23 is larger than the outer diameter of the threaded portion of the bolt 14, and the support portion 12 and the bolt 14 are not in direct contact. As will be described later, the plurality of support portions 12 are formed to have different shapes. The weight 10 is provided with a TOP display 24 indicating the mounting direction. Note that a bass reflex port 25 can be provided on the back side of the speaker box 3, and the speaker box 3 can be operated as a bass reflex cabinet. The periphery of the bass reflex port 25 is covered with a sound absorbing material 26. The speaker box 3 is not provided with the bass reflex port 25 and can be a sealed cabinet. A sound absorbing material or the like can also be placed inside the speaker box 3.
[0018]
2, 3, 4, and 5 show the speaker device 1 of FIG. 1 in a side view, a front view, a back view, and a plan view, respectively. 1 corresponds to a cross-sectional view taken along the section line II in FIG. A case is assumed in which the aperture of the sound emitting unit 7 of the speaker unit 2 accommodated in the speaker box 3 is, for example, about 70 mm. The height H from the top of the speaker box 3 to the bottom of the stand 9 is about 160 mm, the depth D of the speaker box 3 including the net 19 is also about 160 mm, and the width W of the speaker box 3 is about 120 mm. The bolt 14 for fixing the tip of the support portion 12 of the weight 10 is inserted into the back of the hole 21 formed from the box 5 of the speaker unit 3 to the vicinity of the connection portion with the baffle 4. Use as a conclusion. A terminal 22 for electrical connection to the speaker unit 2 is also provided on the back side of the box 5 of the speaker box 3.
[0019]
As described above, in the speaker device 1, the driving unit 6 of the speaker unit 2 is supported in the speaker box 3 that can be divided into the first half and the second half, and the acoustic radiating unit 7 of the speaker unit 2 is supported by the first half of the speaker box 3. It connects to the opening part 4a of a certain baffle 4 via the shock absorbing material 8. FIG. The vibration of the speaker unit 2 itself caused by the reaction force that causes the speaker unit 2 to propagate the sound output to the surrounding air is attenuated by the buffer material 8 and hardly transmitted to the speaker box 3. Inside the speaker box 3, the drive unit 6 of the speaker unit 2 is connected to the main body 11 of the weight 10. Since the main body 11 of the weight 10 has a large mass that can virtually act as a ground for acoustic vibration, the acoustic radiation portion 7 of the speaker unit 2 has a sufficient acoustic impedance compared to the air that propagates the acoustic output. It becomes high and hardly vibrates even when it receives a reaction force due to the radiation of acoustic output to the air.
[0020]
A plurality of support portions 12 having a radially extending shape extend from the main body portion 11 of the weight 10 toward the connection portion 3a between the baffle 4 of the speaker box 3 and the box 5 which is the latter half portion, and the bolt 14 is connected to the speaker box. Since the support portions 12 of the weight 10 are respectively fixed by the three connection portions 3a, the weight 10 can be supported inside the speaker box 3. The driving unit 6 of the speaker unit 2 is connected to the main body 11 of the weight 10 so that vibration is not transmitted to the driving unit 6 of the speaker unit 2 by the main body 11 of the weight 10 acting as a virtual ground. It can be supported inside the speaker box 3. Even when the stand 9 or the like is used to separate the speaker box 3 from the floor or wall of the room where sound is reproduced, it is necessary to insert the stand 9 into the speaker box 3 and directly support the speaker unit 2. Alternatively, the support 9 can be pivoted between the stand 9 and the speaker box 3 to swing the head 9 or the like.
[0021]
6, 7, and 8 show the weight 10 used in the speaker device 1 of FIG. 1 in a side sectional view, a side view, and a front view, respectively. The weight 10 is formed, for example, by die casting using zinc as a material, and has a main body portion 11 having a large mass and a plurality of, for example, three support portions 12a, 12b, 12c. The main body 11 has a substantially truncated cone shape, and has a boss 11a protruding along the axis at the center of the bottom surface. As shown in FIG. 1, the boss 11 a is connected to the drive unit 6 of the speaker unit 2. Three support portions 12a, 12b, and 12c protrude outwardly from the outer peripheral portion on the bottom surface side, and the center lines 10a, 10b, and 10c of the support portions 12a, 12b, and 12c are the bottom surfaces of the main body portion 11, respectively. Are arranged in three equal parts in the circumferential direction. The three support portions 12a, 12b, and 12c are formed so that the widths Wa, Wb, and Wc of the portions protruding in the radial direction from the bottom surface of the main body portion 11 are different from each other.
[0022]
As shown in FIG. 1, through holes 23 for inserting and fixing bolts 14 as fixing members are provided at the tips of the support portions 12 a, 12 b, and 12 c. As shown in FIG. 8, the shape of the through hole 23 and its periphery is common to the three support portions 12 a, 12 b, and 12 c, and each of the support portions 12 a, 12 b, 12 c protrudes from the bottom surface of the main body portion 11. Only the widths Wa, Wb and Wc are different. The center of the through hole 23 is located on a circumference having a radius of about 45 mm from the center of the main body 11. If the shapes of the plurality of support portions 12a, 12b, and 12c are the same, resonance occurs at the same frequency, which may impair the quality of reproduced sound as a speaker as extra resonance.
[0023]
In the weight 10 used for the speaker device 1, the shapes are made different in order to make the resonance frequencies of the plurality of support portions 12a, 12b, and 12c different. Since the plurality of support portions 12a, 12b, and 12c of the weight 10 have different shapes, the vibration frequency at which the support portions 12a, 12b, and 12c resonate is shifted so that vibration does not increase at a specific frequency. it can. As a display related to the difference in shape of the support portions 12a, 12b, and 12c, for example, the TOP display 24 is provided on the support portion 12a to be fixed near the top of the speaker box 3, so that the difference in shape is hardly visible. In addition, the fixing direction of the weight 10 in the speaker box 3 can be prevented from being mistaken when the speaker device 1 is assembled. For example, when two-channel stereo reproduction is performed by arranging a pair of speaker devices on the left and right, the directions of the weights in the speaker device can be made different on the left and right.
[0024]
As shown in FIG. 8, the plurality of support portions 12 a, 12 b, 12 c of the weight 10 are formed so as to extend from the outer periphery of the main body portion 11 at equal intervals in the circumferential direction. Each of the support portions 12a, 12b, and 12c has the same shape at the connection portion of the speaker box 3 fixed by the bolt 14, and the widths Wa, Wb, and Wc of the portions extending from the main body portion 11 are different. The width is different from a variation in molding size, for example, by 0.5 mm. The width Wa of the support portion 12a is 7.4 mm, the width Wb of the support portion 12b is 6.9 mm, and the width Wc of the support portion 12c is It can be 6.4 mm. The degree of difference is from several percent to several tens percent. The support portions 12a, 12b, and 12c need to be strong enough to support the heavy main body portion 11, and cannot be so thin that the strength is insufficient. Further, if the thickness is increased, the volume of the space in the speaker box 3 is reduced. The plurality of support portions 12a, 12b, and 12c are extended from the main body portion 11 of the weight 10 in the circumferential direction with substantially the same shape at equal intervals, and the shapes of the portions extending from the main body portion 11 are made different to resonate. The frequency can be shifted. The portions fixed by the bolts 14 at the connecting portions between the baffle 4 that is the front half of the speaker box 3 and the box 5 that is the rear half at the tips of the support portions 12a, 12b, and 12c can be the same shape. Bolts 14 of the same standard can be used.
[0025]
Of course, the shape of the portions other than the widths Wa, Wb, Wc may be changed in the support portions 12a, 12b, 12c. The dimensions of each part of the speaker device 1 including the weight 10 can also be changed according to the size of the speaker unit 2 or the speaker box 3 to be used. The number of support portions 12 a, 12 b, 12 c of the weight 10 can also be increased or decreased according to the mass of the main body portion 11.
[0026]
【The invention's effect】
As described above, according to the present invention, the weight main body connected to the driving unit of the speaker unit inside the speaker box virtually acts as a ground for acoustic vibration, so that the sound emitting unit of the speaker unit Even if it receives a reaction force due to the radiation of the acoustic output from the air to the air, it can be hardly vibrated. Since a plurality of support portions having a shape extending radially from the main body portion of the weight are fixed at the connection portion between the first half and the second half of the speaker box, the weight can be supported inside the speaker box, and a stand or the like is used. Even at times, it is not necessary to directly support the speaker unit by inserting the stand into the speaker box, and the head can be swung with the stand and the speaker box pivotally supported.
[0027]
Further, according to the present invention, the plurality of support portions of the weight can be formed in different shapes, and the resonance frequency can be shifted so that vibration does not increase at a specific frequency. Even if the difference in shape is difficult to visually recognize, it is possible to confirm on the display so that the fixing direction of the weight in the speaker box is not mistaken during assembly work. For example, when performing two-channel stereo reproduction, it is possible to prevent the weights in the speaker device from having different orientations on the left and right.
[0028]
Further, according to the present invention, the plurality of support portions are extended from the main body portion of the weight in the circumferential direction with substantially the same shape at equal intervals, and the shape of the portion extending from the main body portion is made different, so that the resonance frequency Can be shifted. Since the portion fixed by the fixing member at the connecting portion between the front half portion and the rear half portion of the speaker box at the front end of the support portion can have the same shape, the fixing member having the same standard can be used.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a schematic configuration of a speaker device 1 according to an embodiment of the present invention.
FIG. 2 is a side view of the speaker device 1 of FIG.
3 is a front view of the speaker device 1 of FIG. 1. FIG.
4 is a rear view of the speaker device 1 of FIG. 1. FIG.
5 is a plan view of the speaker device 1 of FIG. 1. FIG.
6 is a side cross-sectional view of the weight 10 in FIG. 1. FIG.
7 is a side view of the weight 10 in FIG. 6. FIG.
8 is a front view of the weight 10 in FIG. 6. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Speaker apparatus 2 Speaker unit 3 Speaker box 3a Connection part 4 Baffle 4a Opening part 5 Box 6 Drive part 7 Acoustic radiation | emission part 8,13 Buffer material 9 Stand 10 Weight 11 Main-body part 12,12a, 12b, 12c Support part 14 Bolt 18 Pivot mechanism 24 TOP display

Claims (3)

The speaker unit is accommodated in a speaker box that can be divided into a first half and a second half, and an opening is provided in the first half. In the speaker device formed by connecting to the opening of the first half of the box via a cushioning material,
In the speaker box, connected to the back side of the driving unit of the speaker unit and having a mass that can virtually act as a ground for acoustic vibration, and the main body toward the connecting portion between the first half and the second half of the speaker box A weight comprising a plurality of support portions having a shape extending radially from
A speaker device comprising: a fixing member for respectively fixing a weight support portion at a connection portion of the speaker box. The speaker device according to claim 1, wherein the weight has the plurality of support portions in different shapes and includes a display related to a difference in shape. The plurality of support portions of the weight are formed to extend from the outer periphery of the main body portion at equal intervals in the circumferential direction,
3. The support portion according to claim 1, wherein a portion fixed by the fixing member at a connection portion of the speaker box has the same shape, and a shape of a portion extending from the main body portion is different. Speaker device.

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