JP2008118166A - Speaker enclosure, speaker system having the same and multichannel stereo system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker enclosure, a speaker system and a multi-channel stereo system capable of maintaining an excellent phase frequency characteristic and not causing turbulence on a wavefront of an acoustic wave emitted from a speaker unit. <P>SOLUTION: The speaker enclosure includes a unit arrangement plane 27 having an arc-shaped cross section similar to a virtual circle R having a center at a standard listening position P on the front surface of a baffle plate 21 or a unit arrangement plane 27 having a partially spherical shape similar to a virtual globe (globe R) having a center at the standard listening position P on the front surface of the baffle plate 21. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a speaker enclosure having a baffle plate on the front surface, a speaker system including the same, and a multi-channel stereo system.

2. Description of the Related Art Conventionally, a speaker system in which a plurality of speaker units are incorporated in a speaker enclosure so that the distance between a listening position and each speaker unit is equal is known (for example, see Patent Document 1). In this speaker enclosure, the upper unit mounting plate for mounting the high-frequency speaker unit, the middle unit mounting plate for mounting the mid-frequency speaker unit, and the lower unit mounting plate for mounting the low-frequency speaker unit are faced to each other. A baffle plate that is bonded and warped upward is formed. Thus, there is no difference in the arrival time of the reproduced sound from each speaker unit at the listening position, and the speaker system is configured with excellent phase frequency characteristics.
Japanese Utility Model Publication No. 56-46389

  As described above, in the conventional speaker system (speaker enclosure), since the abutting portion of each unit mounting plate has a corner shape, a part of the wave front of the acoustic wave radiated in a hemispherical shape using each speaker unit as a sound source There is a problem that the reproduced sound is disturbed by diffraction at the butt portion (see FIG. 5B). In addition, due to the abutting portion of each unit mounting plate, there is a problem that the rigidity of the baffle plate itself is lowered and the reproduced sound due to resonance is disturbed.

  The present invention provides a speaker enclosure that maintains excellent phase frequency characteristics and does not cause disturbance in the wavefront of the acoustic wave radiated from the speaker unit, a speaker system including the speaker enclosure, and a multi-channel stereo system. That is the issue.

  The speaker enclosure of the present invention is characterized in that a unit arrangement surface having an arcuate cross section following a virtual circle centered on the standard listening position is provided on the front surface of the baffle plate.

  Similarly, another speaker enclosure according to the present invention is characterized in that a front surface of a baffle plate is provided with a part-spherical unit arrangement surface that follows a virtual sphere centered on a standard listening position.

  According to this configuration, the unit arrangement surface of the baffle plate is formed in a shape that follows the virtual circle or the spherical surface of the virtual sphere centered on the standard listening position, and thus becomes a two-dimensional curved surface or a three-dimensional curved surface. No step or angle change occurs on the unit mounting surface, and when a speaker unit is incorporated in the unit mounting surface, it is possible to effectively prevent acoustic waves from being diffracted by the baffle plate. Therefore, the wavefront of the acoustic wave radiated from the speaker unit is not disturbed, and high-quality reproduction can be achieved. Further, when a plurality of speaker units are provided on the unit arrangement surface, there is no difference in the arrival time of the reproduced sound from each speaker unit at the standard listening position, and the phase frequency characteristics can be improved. Note that the listening position is the position of the user's ear to listen to, the distance from the sound source position of the speaker unit is 2.5 to 3.0 m, and the height from the floor is about 1.0 m (standard). Listening position). The unit arrangement surface in the former invention is preferably formed in a circular arc shape in the vertical section in the so-called vertical speaker enclosure and in a circular cross section shape in the horizontal speaker enclosure. Further, the unit disposition surface may be the entire front surface of the baffle plate or may be a partial region.

  In these cases, it is preferable that they are vertically placed and have a vertically long round baffle shape.

  According to this configuration, the unit arrangement surface of the baffle plate is viewed from the front (front surface) by combining the curved surface that is convex when viewed from above in the round baffle and the curved surface that is concave following the spherical surface of the virtual circle or virtual sphere. It becomes almost elliptical. When a general 2-way or 3-way speaker unit is attached to this, the high-frequency speaker unit is disposed in a narrow portion that is an elliptical long end. For this reason, in the high-frequency speaker unit, the sound spread becomes good, and a good directional sensitivity characteristic (directional frequency characteristic) can be obtained as a whole system. Needless to say, in a vertically long form with a floor height of about 1 m, the baffle plate is somewhat upward in relation to the standard listening position.

  In these cases, it is preferable that at least the front portion of the baffle plate is formed of either a single plate without a joint or a plywood.

  If there are joints on the baffle plate, the rigidity of the baffle plate is lowered and problems such as resonance occur. However, by using a plate material without a joint, sound disturbance due to resonance or the like can be effectively prevented.

  In these cases, the unit disposition surface is preferably formed by grinding the front surface of the baffle plate.

  The unit arrangement surface that becomes a two-dimensional curved surface can be formed relatively simply by simply bending the baffle plate (three-dimensional curved surface is difficult), but when bent, the back surface of the baffle plate also follows this to become a two-dimensional curved surface. In other words, it is not preferable to construct a phase-inverted speaker enclosure or the like. The back plate of the speaker enclosure is preferably formed in parallel with the baffle plate (the back surface thereof).

  A speaker system according to the present invention includes the above-described speaker enclosure and one or more speaker units attached to a speaker attachment surface.

  According to this configuration, the diffraction phenomenon of the acoustic wave can be effectively prevented, so that the wave front of the acoustic wave radiated from the speaker unit is not disturbed, and high-quality reproduction can be achieved.

  In this case, it is preferable to include a plurality of speaker units having different bands.

  According to this configuration, further high-quality reproduction can be achieved by the cooperation of the plurality of speaker units and the speaker enclosure.

  Further, the unit disposition surface is formed by grinding the front surface of the baffle plate, and it is preferable that either the duct opening or the passive radiator is further provided on the unit disposition surface.

  According to this configuration, high-quality reproduction in the low sound range can be realized, and the duct and the passive radiator have a narrow portion that is the long end of the elliptical unit mounting surface, in other words, a thick portion of the baffle plate. It will be arranged. For this reason, especially in the case of the duct, the portion other than the baffle plate of the duct can be shortened while maintaining the actual duct length.

  Furthermore, a plurality of speaker units are provided, and the speaker enclosure can be constituted by a plurality of divided enclosures independent for each speaker unit.

  According to this configuration, the speaker enclosure can be divided while maintaining high-quality reproduction, thereby improving the transportability and the degree of freedom of installation.

  The multi-channel stereo system of the present invention is characterized in that a plurality of the above-described speaker systems are respectively arranged so that the unit arrangement surface coincides with a virtual circle or a virtual spherical surface and surrounds the standard listening position. .

  According to this configuration, at the standard listening position, the distance from each speaker unit surrounding the same is the same. For this reason, there is no difference in the arrival time of the reproduced sound from the plurality of speaker units, and the phase frequency characteristics can be improved as a system.

  A speaker system and a multi-channel stereo system to which a speaker enclosure (hereinafter referred to as “enclosure”) according to an embodiment of the present invention is applied will be described below with reference to the accompanying drawings. FIG. 1 is a schematic diagram of a speaker system according to an embodiment, and FIG. 2 is an external perspective view of the speaker system. As shown in both figures, this speaker system 1A includes a round baffle-type enclosure 2 that is formed vertically, a low stand 3 that supports the enclosure 2, a high-frequency speaker unit 4 incorporated in the enclosure 2, and a mid-range The speaker unit 5 and the low-frequency speaker unit 6 are configured. The low stand 3 includes a stand base 11 on which the enclosure 2 is seated and four leg portions 12 extending from the stand base 11 in four directions, and an adjustment bolt 13 is incorporated in each leg portion 12. In the present embodiment, “front” or “front” refers to a surface or direction directly opposite the listening position (standard listening position), and “rear” refers to the opposite.

  The enclosure 2 includes a baffle plate 21, side plates 22 and 22, a top plate 23, a bottom plate 24 and a back plate 25, each of which is mainly made of MDF (Medium Density Fiberboard), and has a cross-section that is vertically long and emphasizes a curved surface. It is formed in a substantially spindle shape (strictly speaking, a cross-sectional shape parallel to the top plate 23 and the bottom plate 24 is a substantially spindle shape). The baffle plate 21 is disposed somewhat obliquely upward so that the baffle plate 21 faces the listening position (standard listening position) P, that is, the top plate 23 is located rearward with respect to the bottom plate 24, and the back plate 25 is provided with a baffle plate. It is inclined at an angle so as to be parallel to the plate 21. On the other hand, in order to constitute the floor-mounted enclosure 2, the bottom plate 24 is disposed horizontally, and the top plate 23 is disposed in parallel to the floor plate 24. As will be described in detail later, the distance between the speaker units 4, 5, 6 and the listening position P is made equal, and the center of gravity position of the entire system is moved rearward so that it is at a substantially front-rear intermediate position. (See FIG. 1). Note that the enclosure 2 of the present embodiment is designed to have a height of 1200 mm.

  As shown in FIGS. 2 to 4, the top plate 23 is formed in a substantially spindle shape following the cross-sectional shape of the enclosure 2. From the upper side, a projecting plate 31 as a finishing material, a top plate body 32 having the same shape as this, and the enclosure 2 and a top plate reinforcing frame 33 which is complementary to the inner peripheral surface of the inner peripheral surface. Similarly, the bottom plate 24 is formed in a substantially spindle shape, and a bottom plate main body 35 having a bottom surface as a decorative finish (projection plate) and a bottom plate reinforcing frame 36 that is complementary to the inner peripheral surface of the enclosure 2 are laminated from below. Configured. Each side plate 22 has a decorative finish (projection plate) on the outer surface, is curved inward in the short side direction following the spindle shape, and is formed in a substantially rectangular shape (parallelogram). The back plate 25 is composed of a back plate body 38 having an arcuate cross section and a decorative finish on the outer surface (lacquered on the veneer), and a back plate reinforcement plate 39 laminated inside the back plate body 38. . In this case, the rear ends of the side plates 22 and 22 are abutted against the back plate main body 38, and a back plate reinforcing plate 39 is disposed between the rear ends of the side plates 22 and 22. Further, a terminal mounting portion 40 is formed in the lower portion of the back plate 25 (see FIG. 3C).

  The baffle plate 21 includes a lacquered main baffle plate 42 to which the speaker units 4, 5, and 6 are attached, and a sub baffle plate 43 laminated on the back surface of the main baffle 42. As will be described in detail later, a unit arrangement surface 27 is formed on the front surface of the baffle plate (main baffle plate 42) 21 so as to be recessed in an arc shape. A first unit opening 45 to which the high frequency speaker unit 4 is attached, a second unit opening 46 to which the mid frequency speaker unit 5 is attached, a third unit opening 47 to which the low frequency speaker unit 6 is attached, and a duct 28 are configured. Duct openings 48 are respectively formed (see FIGS. 3B and 3C).

  On the other hand, inside the enclosure 2, an upper space 51 connected to the first unit opening 45 has a forward-facing “V” -shaped median plate 52 that hangs down from the top plate 23, and the first unit opening 45 and the second unit opening. A diaphragm plate 53 extending rearward from a boundary portion with 46 is disposed, and thereby a chamber (air chamber) 54 for the high-frequency speaker unit 4 is configured. A first reinforcing frame 56 formed in a complementary shape with respect to the inner peripheral surface of the enclosure 2 is provided below the diaphragm 53. A second reinforcing frame 57 formed in a complementary shape with respect to the inner peripheral surface of the enclosure 2 is provided at a boundary portion between the second unit opening 46 and the third unit opening 47. Similarly, a third reinforcing frame 58 formed in a complementary shape to the inner peripheral surface of the enclosure 2 is provided at a boundary portion between the third unit opening 47 and the duct opening 48. In addition, a pair of inner plates are attached between the first reinforcing frame 56 and the second reinforcing frame 57 and between the second reinforcing frame 57 and the third reinforcing frame 58 so as to be attached to the rear portions of the side plates 22 and 22. Inner adhesive reinforcements 59 and 59 are provided, respectively.

  On the other hand, a cylindrical duct material 62 connected to the duct opening 48 is provided in the lower space 61 of the enclosure 2. The duct material 62 is directly fixed to the back surface of the main baffle plate 42 and constitutes the duct (acoustic port) 28 together with the duct opening 48. Although details will be described later, a portion where the duct opening 48 is formed in the main baffle plate 42 is formed to be thick, and the duct material 62 is shortened accordingly. For this reason, coupled with the direct fixing of the duct material 62 to the main baffle plate 42, the duct 28 can be formed more firmly than the duct length.

  Next, the baffle plate 21 and the unit arrangement surface 27 formed thereon will be described in detail. As shown in FIG. 1, a unit arrangement surface 27 having an arc-shaped vertical section following a virtual circle R centered on the listening position P is formed on the front surface of the main baffle plate (baffle plate 21) 42. . The unit arrangement surface 27 is formed by grinding so as to dig into the front surface of the main baffle plate 42, and is formed by combining a curved surface that is convex when viewed from above in the round baffle and a curved surface that is concave following the virtual circle R. , When viewed from the front (front), it is formed in a substantially elliptical shape.

  The unit arrangement surface 27 has a size that reaches the entire front surface of the main baffle plate 42 so as to include the first unit opening 45, the second unit opening 46, the third unit opening 47, and the duct opening 48. Have. As a result, the first unit opening 45 and the duct opening 48 in which the high frequency speaker unit 4 is incorporated are respectively disposed at the vertically long ends of the ellipse. The high-frequency speaker unit 4 is disposed in the narrow portion that is the long end of the ellipse, so that the sound spread in the high-frequency speaker unit 4 is promoted, and the directional sensitivity characteristics that are favorable as the entire system Can be obtained. Further, since the duct opening 48 is disposed in the thick part of the main baffle plate 42, the rigidity of the duct 28 can be increased as described above. Instead of the duct 28, a passive radiator or the like may be provided to configure the phase inversion type enclosure 2.

  As described above, in the present embodiment, the unit disposition surface 27 of the enclosure 2 is formed in an arc of a longitudinal section that follows the virtual circle R with the listening position P as the center. Further, no step or angle change occurs on the unit arrangement surface 27, and the diffraction of acoustic waves by the baffle plate 21 can be effectively prevented. Therefore, the wave front of the acoustic wave radiated from each speaker unit 4, 5, 6 is not disturbed, and high-quality reproduction can be achieved. Further, since the distances between the speaker units 4, 5, 6 and the listening position P are equal, there is no difference in the arrival time of the reproduced sound from the speaker units 4, 5, 6, and the phase frequency characteristics are improved. Can be made. The listening position P of the present embodiment is the position of the ear of the user who listens, and the distance from the sound source position of each speaker unit 4, 5, 6 is 3.0 m and the height from the floor is 1. It is set to 0m.

  Note that the unit arrangement surface 27 of the present embodiment is centered on a virtual circle R (the listening position P drawn in a plane passing through the listening position P and the left and right center of the unit arrangement surface 27 centered on the listening position P). Is formed in a partially spherical shape following a virtual sphere (sphere R) centered on the listening position P (see FIG. 1). . In addition, the enclosure 2 of the present embodiment is made of a wood material mainly composed of MDF, but it is originally made of a ground board, a veneer core plywood, a particle board, a lumbar core plywood, a laminated material, or a combination thereof. Alternatively, it may be made of a resin material (molded product). The same applies to other embodiments described below.

  Next, with reference to FIG. 6, a speaker system 1B according to a second embodiment of the present invention will be described. In this speaker system 1B, a vertically placed enclosure 2B is divided in units of speaker units. That is, the high frequency speaker unit 4 is incorporated in the upper enclosure 71, the mid frequency speaker unit 5 is incorporated in the intermediate enclosure 72, and the low frequency speaker unit 6 is incorporated in the lower enclosure 73. The upper enclosure 71 includes a baffle plate 21a, both side plates 22a, a top plate 23a, a bottom plate 24a, and a back plate 25a. The baffle plate 21a has an arcuate vertical cross section following a virtual circle R centered on the listening position P. The unit arrangement surface 27a is formed. Similarly, the intermediate enclosure 72 also includes a baffle plate 21b, both side plates 22b, a top plate 23b, a bottom plate 24b, and a back plate 25b. The baffle plate 21b is formed with a unit arrangement surface 27b having a circular arc cross section. ing. Similarly, the lower enclosure 73 also includes a baffle plate 21c, both side plates 22c, a top plate 23c, a bottom plate 24c, and a back plate 25c. The baffle plate 21c is formed with a unit arrangement surface 27c having an arcuate cross section. Yes. However, the top plates 23a, 23b, and 23c and the bottom plates 24a, 24b, and 24c of the enclosures 71, 72, and 73 are disposed horizontally, and the back plates 24a, 24b, and 24c are disposed vertically.

  In a state where the upper enclosure 71, the intermediate enclosure 72, and the lower enclosure 73 are stacked so as to be stacked, the unit arrangement surfaces 27a, 27b, and 27c of the enclosures (divided enclosures) 71, 72, and 73 are surfaces. A two-dimensional curved surface is formed as a unit, and the back plates 24a, 24b, and 24c are also configured to be flush with each other. That is, the enclosure 2B (71, 72, 73) of the second embodiment has a basic form in which the enclosure 2 of the first embodiment is divided into speaker units 4, 5, and 6 units. The enclosures 71, 72, 73 may be formed to have the same width, or may be formed so as to become wider from top to bottom.

  In such a configuration, since the speaker system 1B is configured by three divided systems (divided enclosures), even if the entire size is increased, it can be transported individually, so that handling is easy. In addition, when properly installed (stacked), the unit arrangement surfaces 27a, 27b, and 27c in each divided system constitute an integral two-dimensional curved surface (three-dimensional curved surface) having no step or the like. In addition, high-quality reproduction can be achieved by eliminating acoustic diffraction and the like.

  Next, a speaker system 1C according to a third embodiment of the present invention will be described with reference to FIG. In this speaker system 1C, the horizontally placed enclosure 2C is divided into units of speaker units. That is, the left speaker unit 81 is incorporated in the left enclosure 91, the center speaker unit 82 is incorporated in the intermediate enclosure 92, and the right speaker unit 83 is incorporated in the right enclosure 93. The left enclosure 91 and the right enclosure 93 each have a baffle plate 21d, side plates 22d, a top plate 23d, a bottom plate 24d, and a back plate 25d. Each baffle plate 21d has a virtual circle centered on the listening position P. A unit disposition surface 27d having a circular arc cross section following R is formed. Similarly, the intermediate enclosure 92 also includes a baffle plate 21e, both side plates 22e, a top plate 23e, a bottom plate 24e, and a back plate 25e. The baffle plate 21e is formed with a unit disposition surface 27e having a circular arc cross section. ing.

  In the state where the left enclosure 91, the middle enclosure 92, and the right enclosure 93 are arranged side by side, the unit arrangement surfaces 27d, 27e, 27d of the enclosures (divided enclosures) 91, 92, 93 are flush with each other. Thus, a two-dimensional curved surface is formed, and the back plates 25d, 25e, and 25d are also configured to be flush with each other. Since the unit disposition surfaces 27d, 27e, and 27d of the enclosures 91, 92, and 93 are two-dimensional curved surfaces, the left enclosure 91 and the right enclosure 93 are horizontally reversed.

  In such a configuration, since the speaker system 1C is constituted by three divided systems (divided enclosures) arranged side by side, even if the entire size is increased, it can be transported individually, so that handling is easy. In addition, when properly installed (side by side), the unit arrangement surfaces 27d, 27e, and 27d in each divided system form an integral two-dimensional curved surface (three-dimensional curved surface) without a step or the like. High quality regeneration can be achieved by eliminating diffraction and the like. In addition, as long as the unit arrangement surfaces 27d, 27e, and 27d are arranged following the virtual circle (virtual sphere), the enclosures (split systems) 91, 92, and 93 are separated from each other sideways. It is also possible to install.

  Next, a multi-channel stereo system 100 to which the speaker system of the above embodiment is applied and a home theater will be described with reference to FIG. In the multi-channel stereo system 100, for example, the speaker system 1A of the first embodiment is disposed at the front left, the front right, the rear left, and the rear right at the listening position P, and the speaker of the third embodiment is disposed in front of the front. The system 1C is arranged and configured. In this case, the unit arrangement surfaces 27 of all the enclosures 2 (2c) in each speaker system follow a common phantom sphere (sphere R) with the listening position P as the center, and have a circular or partial spherical shape in vertical and horizontal cross sections. And arranged so as to be equidistant from the listening position P. Further, the speaker system of the third embodiment is designed for a low frequency range (only the center system may be used) in consideration of the expansion of the low frequency range. That is, a stereo system of 5 (4.1) channels is constructed as a whole. With such a configuration, it is possible to obtain a reproduced sound with a rich sense of presence at the listening position P.

  Furthermore, as shown in the figure, it is preferable to dispose a large-screen display (high-vision) D such as a television or a projector above the speaker system 1C of the third embodiment. With such a configuration, it is possible to configure a realism comparable to a movie theater or a theater, that is, a next-generation home theater.

  Although the round baffle type enclosure has been described in the present embodiment, the present invention can also be applied to various non-sealed, sealed, bass reflex type enclosures provided with a baffle plate.

It is a mimetic diagram of a speaker system concerning an embodiment. 1 is an external perspective view of a speaker system according to an embodiment. It is the top view (a), front view (b), and longitudinal cross-sectional view (c) in the enclosure of a speaker system. They are AA sectional view (a), BB sectional drawing (b), CC sectional drawing (c), DD sectional drawing (d) in FIG.3 (c). It is sectional drawing (a) which shows the state of the acoustic wave in the front surface of an enclosure compared with a prior art (a). It is a schematic diagram of the speaker system which concerns on 2nd Embodiment. It is a schematic diagram of the speaker system which concerns on 3rd Embodiment. 1 is a plan view of a multi-channel stereo system according to an embodiment.

Explanation of symbols

1A Speaker System 1B Speaker System 1C Speaker System 2 Enclosure 4 High Frequency Speaker Unit 5 Mid Frequency Speaker Unit 6 Low Frequency Speaker Unit 21 Baffle Plate 22 Side Plate 23 Top Plate 24 Bottom Plate 25 Back Plate 27 Unit Arrangement Surface 28 Duct 62 Duct material 71 Upper enclosure 72 Middle enclosure 73 Lower enclosure 81 Left speaker unit 82 Center speaker unit 83 Right speaker unit 91 Left enclosure 92 Middle enclosure 93 Right enclosure 100 Multi-channel stereo system P Listening position R Virtual sphere R Virtual ball

Claims (10)

  A speaker enclosure comprising a unit arrangement surface having an arc-shaped cross section following a virtual circle centered on a standard listening position on a front surface of a baffle plate.   A speaker enclosure, comprising: a front surface of a baffle plate having a partially spherical unit arrangement surface imitating a virtual sphere centered on a standard listening position.   The speaker enclosure according to claim 1, wherein the speaker enclosure is a vertically long round baffle type.   3. The speaker enclosure according to claim 1, wherein at least a front portion of the baffle plate is formed of any one of a single plate and a plywood without a joint.   The speaker enclosure according to claim 1 or 2, wherein the unit disposition surface is formed by grinding a front surface of the baffle plate. The speaker enclosure according to claim 1 or 2,
One or more speaker units attached to the unit disposition surface.   The speaker system according to claim 6, comprising a plurality of speaker units having different bands. The unit disposition surface is formed by grinding the front surface of the baffle plate,
The speaker system according to claim 6, wherein either one of an opening of a duct and a passive radiator is further provided on the unit arrangement surface. With multiple speaker units,
The speaker system according to claim 6, wherein the speaker enclosure is configured by a plurality of independent enclosures for each of the speaker units.   A plurality of speaker systems according to claim 6, wherein a plurality of speaker systems are arranged so that the unit arrangement surface coincides with the virtual circle or the virtual spherical surface and surrounds the standard listening position. Channel stereo system.

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