JP7303621B2 - speaker system - Google Patents

Description

The present invention relates to a speaker device, and more particularly to a speaker device suitable for a sound masking system.

By using partition panels to divide the space into various shapes, it is possible to easily set up booths such as a reception space and a business meeting space. In a booth formed in this way, although the privacy of the people inside the booth partitioned by panels can be visually protected, the voices of conversations inside the booth leak outside and are heard by third parties. Therefore, it is required to audibly protect the privacy of those in the booth.

A speaker unit that masks the voice is known as a technique for preventing the conversation voice in the booth from leaking to the outside. Sound is output from the speaker unit by connecting to an input terminal (connector) provided in the speaker unit installed on the upper part and transmitting an electric signal from the amplifier. In addition, by installing multiple speaker units on the upper part of the panel, it is possible to protect the auditory privacy of each booth.

Japanese Patent Publication No. 7-81347 (page 2, FIG. 3)

However, in order to use a plurality of speaker units, the input terminals of the respective speaker units and the amplifier are electrically connected by means of connection cords. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a loudspeaker apparatus that facilitates expansion of the loudspeaker apparatus.

In order to solve the above problems, the speaker device of the present invention includes:
A speaker device attached to a panel member that partitions a space,
The box in which the speaker is housed has two connectors with two poles that can be electrically connected from the outside of the box,
the speaker and the two connectors are electrically connected in parallel for each pole inside the box;
The box is a substantially rectangular parallelepiped extending in the left-right direction, the connector is arranged on the lower surface thereof, and the connector is connected to the wiring cable from the outside of the box,
The speaker device is fixed on the panel cover so as to extend across two adjacent panel covers provided on the upper part of the panel member, and the two speaker devices are mounted on at least one of the two panel covers. A notch through which the wiring cable is inserted is formed in the connecting portion of the panel cover.
According to this feature, one connector can be used as an input terminal, and the other connector can be used as an output terminal when electrically connected to a connector of another speaker device, making it easy to increase the number of speaker devices.

The two connectors are arranged in two receptacles formed on the lower surface of the box in a laterally spaced manner, respectively, and have a structure for guiding the distribution cable in the left and right directions.
According to this feature, when installing an additional speaker device, the wiring cable can be extended without causing a large bend.

The box is characterized in that a concave groove extending in the left-right direction is formed on the bottom surface thereof.
According to this feature, a space for storing the distribution cables can be secured on the bottom surface of the box.

The speaker device includes a transformer inside the box, and the transformer is electrically connected between one of the connectors and the speaker.
According to this feature, the electric circuit related to the speaker device becomes a high-impedance connection, and the transmission loss in the wiring can be reduced, so long-distance transmission becomes possible.

The box has a front-rear width of 25 to 40 mm, a left-right width of 200 to 300 mm, and an internal volume of 100 to 120 cm ³ .
According to this feature, the front-rear width of the box is set to 25 to 40 mm, which is equal to or less than the thickness of the panel members, so that the speaker device does not protrude in the front-rear direction and has a good appearance.

1 is a perspective view showing a speaker device attached to a panel member in an embodiment of the present invention; FIG. 1 is an exploded perspective view showing a speaker device in an embodiment; FIG. FIG. 4 is a perspective view showing wiring between parts in a box; It is a bottom view of a speaker apparatus, (a) is a figure which shows the state before attaching a connector, (b) is a figure which shows the state which attached the connector. It is the perspective view which looked at the speaker apparatus from the downward direction. 1 is a front view of a speaker device; FIG. FIG. 3 is a perspective view showing how a plurality of speaker devices and amplifiers are connected by wiring cables; 2 is a simple electrical circuit diagram of the speaker device; FIG. FIG. 4 is a perspective view of a speaker device attached to the upper portion of the panel member; FIG. 4 is a front view of the speaker device when wiring cables are arranged below the speaker device;

A mode for carrying out a speaker device according to the present invention will be described below based on an embodiment.

A product display device according to a first embodiment will be described with reference to FIGS. 1 to 9. FIG. Hereinafter, the lower right side of the paper surface of FIG. 2 and the lower side of the paper surface of FIG. 4 are defined as the front side (front side) of the product display device, and the description will be made based on the vertical and horizontal directions when viewed from the front side.

As shown in FIG. 1, a plurality of panel members 10, 10, . The speaker device 1 is placed on the upper surface of the panel member 10 and fixed to the panel member 10 (see FIG. 9). By installing a plurality of speaker devices 1 on the panel members 10, 10, and outputting the masking sound, the conversation voice in each booth B, B, . there is

As shown in FIG. 2, the speaker device 1 includes a box 2 extending in the left-right direction and forming a substantially rectangular parallelepiped; is mainly composed of The box 2 includes a box body 4 whose top is open, and a baffle plate 5 which has a speaker 6 facing upward at substantially the center and closes the box body 4 from above. For convenience of explanation, only one of the members/parts having substantially the same left and right will be explained unless otherwise specified.

The upper surface plate 3 is a substantially plate-shaped member that extends left and right. Extension portions 32, 32 extending in the left and right direction and extending downward are formed at the front and rear ends of a flat plate. Openings 31 are formed from the front and back of both ends to the left and right outer sides (see FIGS. 5 and 6).

The baffle plate 5 includes a flat plate 50 extending to the left and right, and a recess formed substantially in the center is provided with a pedestal 55 on which the speaker 6 is placed. 51, the speaker 6 can be placed facing upward. Bass reflex ports 52 are provided at both left and right ends of the baffle plate 5 . The bass reflex port 52 is composed of an end portion 56 of the baffle plate 5 and a duct 52a extending downward from the end portion 56. The bass reflex port 52 is formed with a through hole 52b penetrating vertically.

The box 4 has a transformer 7, a substrate 8, and a connector 9 fixed to the substrate 8 attached thereto. The bottom plate portion of the box 4 is provided with two pedestals 42, 42 on which the substrate 8 is placed at positions substantially equal in distance from the center in the left-right direction. A through hole 41 communicating with the outside of the body 4 is formed.

As shown in FIG. 3, each board 8 is electrically connected to a connector 9 respectively. The two substrates 8, 8 are electrically connected by two conductors 18a, 18b. One substrate 8 is electrically connected to a speaker 6 via a transformer 7 . Specifically, conductors 17 a and 17 b are wired between one substrate 8 and the transformer 7 , and conductors 16 a and 16 b are wired between the transformer 7 and the speaker 6 . Each connector 9 has two poles that can be electrically connected from the outside of the box 2, and the connectors 9, 9, boards 8, 8, transformer 7, and speaker 6 are connected pole by pole, form a parallel connection.

As shown in FIG. 4(a), a bottom plate surface 46 of the box 4 is formed with a groove 47 extending left and right, and a through hole 41 is formed in a bottom surface 47a of the groove 47. As shown in FIG. The through hole 41 is provided with an inclined surface 48 forming an arcuate inclined plane of a substantially quadrant on the right and left inner sides of the through hole 41, so that the through hole 41 gradually widens downward and inward. Further, as shown in FIG. 4B, when the substrate 8 is arranged on the pedestal 42, the connector 9 faces downward and is inserted through the through hole 41. Since the two connectors 9, 9 are arranged at positions with substantially equal distances from the center in the left-right direction, the left-right balance of the sound output from the speaker device 1 is maintained. In addition, a paddle hole 45 is formed in the bottom plate surface 46 .

A method and structure for connecting the wiring cable 91 to the connector 9 will be described. The wiring cable 91 can be connected and fixed by elastically sandwiching the bare copper wire at the end of the cable 91 with the connector 9 . As shown in FIG. 5 , the wiring cable 91 connected to the connector 9 is laid along the inclined surface 48 with the tip side of the wiring cable 91 running along the slanted surface 48 and the groove 47 on the side away from the end of the wiring cable 91 . is extended along a substantially straight line on the bottom surface 47a. At this time, since the front-to-rear width of the groove 47 is wider than that of the two distribution cables 91 , the two distribution cables 91 and 91 can be arranged in the groove 47 so as to pass each other. Since the wiring cable 91 is housed in the concave groove 47, the wiring cable 91 is concealed and the appearance is excellent (see FIG. 6).

As shown in FIG. 7, an amplifier 11 for inputting electric signals is connected to a speaker device 1 by a wiring cable 91a, and the speaker device 1 is connected to another speaker device 1' by a wiring cable 91b. In this manner, the amplifier 11 and a plurality of adjacent speaker devices 1, 1', . . . can be connected by wiring cables 91a, 91b, . At this time, as shown in FIG. 8, the electric signal input from the amplifier 11 is transmitted to the speaker 6 via the transformer 7 in the speaker device 1, and is electrically connected to the wiring branched in the speaker device 1. Since the sound is transmitted from the wiring cable 91b to the speaker 6' via the transformer 7' in the other speaker device 1', the sound can be output from the speakers 6, 6' of the plurality of speaker devices 1, 1', . , electrically connected by a plurality of wiring cables 91a, 91b, . . . form a group of parallel circuits.

Attachment of the speaker device 1 to the upper portion of the panel member 10 will be described. As shown in FIG. 9, a groove 12 having a substantially U-shaped cross section is formed in the upper portion of the panel member 10 over the left and right, along which the distribution cable 91 extends in the left-right direction. Next, the panel cover 13 extending in the left-right direction has cutouts 14 formed at both left and right ends through which the wiring cables 91 are inserted. 91 can be hidden and the appearance is good. After that, the upper surface of the panel cover 13 is fixed with screws (not shown) or nailed, and the speaker device 1 is attached to the panel member by engaging the pharmacy hole 45 (see FIG. 4) of the bottom plate surface 46 of the speaker device 1 . 10 can be detachably fixed to the upper part. In addition, the wiring cable 91 crawls from the connector 9 along the inclined surface 48, extends substantially straight along the groove 47, extends obliquely downward in the central part of the left and right, and is inserted into the notch 14. Since the wiring cable 91 is not folded near the connector 9 or at the notch 14, the wiring cable 91 can be extended without being bent significantly.

Next, the relationship between the size of the speaker device 1 and the output sound will be described in detail. In the case of a general speaker device, the characteristics of the resonance frequency are determined by Equation 1, and the output balance from the low range to the high range is taken into consideration. A speaker device that has a resonance frequency at 125 Hz and can output 50 dB or more at 125 Hz so as to be suitable for sound masking, so that the sound in the low range can be output sufficiently while sacrificing the sound in the high range to some extent. investigated. In order to realize such a speaker device, it was found that it was necessary to satisfy the equation 2 derived experimentally. It was also found that the internal volume should be 100 to 120 cm ³ , the inner diameter of the bass reflex port 52 should be 3 to 5 mm, and the length should be 15 to 20 mm. For example, if the box 2 has a front-rear width of 40 mm, a vertical width of 25 mm, a horizontal width of 250 mm, an internal volume of 110 cm ³ , and an inner diameter of the bass reflex port 52 of 4 mm (radius of 2 mm), then the length L of the bass reflex port 52 is 19 mm. (However, the cross-sectional area S of the bass reflex port 52 is 3.14×0.2 ² =0.1256 cm ² and the internal volume is 0.11 L).

As described above, the box 2 housing the speaker 6 has two connectors 9 with two poles that can be electrically connected from the outside of the box 2. The speaker 6 and the two connectors 9 are connected to the box. 2, one connector 9 can be used as an input terminal, and the other connector 9 can be used as an output terminal when electrically connected to the connector 9 of another speaker device 1. It is easy to increase the number of speaker devices 1.

Further, the box 2 is a substantially rectangular parallelepiped extending in the left-right direction, and the connector 9 is arranged on the lower surface thereof. Since the distribution cable 91 crawls under the box 2, the distribution cable 91 can be hidden.

Further, since the box 2 has the recessed groove 47 extending in the left-right direction on the bottom surface thereof, a space for storing the distribution cable 91 can be secured on the bottom surface of the box 2 .

The two connectors 9 are respectively arranged in two insertion openings formed on the bottom surface of the box 2 so as to be separated from each other in the left and right direction. Therefore, when the speaker device 1 is added, the wiring cable 91 can be extended without causing a large bend.

Further, the speaker device 1 includes a transformer 7 inside the box 2, and since the transformer 7 is electrically connected between the connector 9 on one side and the speaker 6, the electrical circuit of the speaker device 1 is It becomes a high-impedance connection, and transmission loss in wiring can be reduced, enabling long-distance transmission.

Further, the speaker device 1 is fixed on a panel cover 13 so as to extend across two adjacent panel covers 13, 13 provided on the upper part of the panel member 10. A notch 14 through which the wiring cable 91 is inserted is formed in the connecting portion of the. Therefore, since there is an insertion hole formed by the notch 14 formed in the connecting portion of the two panel covers 13, 13, the wiring cable 91 can be passed through the lower surface of the speaker device 1 and under the panel cover 13. 91 is not exposed.

The box 2 has a front-rear width of 40 mm, a left-right width of 250 mm, an internal volume of 110 cm ³ , and the bass reflex port has an inner diameter of 4 mm and a length of 19 mm. While the speaker device 1 is installed on the member 10, the sound in the low frequency range necessary for the sound masking system can be sufficiently emitted. Further, by setting the front-to-rear width of the box 2 to 40 mm and making it equal to or less than the thickness of the panel member 10, the speaker device 1 does not protrude in the front-to-rear direction and has a good appearance.

In addition, since the box 2 is covered with the top plate 3 having substantially the same left-right and front-back dimensions of the box 2, it is difficult to be recognized as a speaker device from the outside, and the box 2 is excellent in appearance and can be installed on the panel member 10. Are suitable.

In addition, since the transformer 7, the substrate 8, the projecting portion 43, and the engaging portion 44 are arranged substantially in the front-rear center of the bottom plate portion of the box 4, there are left and right gaps between these parts and the front and rear walls of the box. Since the space extending to 2 is formed, the resonance in the box space portion V2 is improved.

In addition, the left and right bass reflex ports 52, 52 are arranged with a shift in the front and rear directions, and are substantially symmetrical about the center of the baffle plate 5. Therefore, even if the baffle plate 5 is rotated 180 degrees around the vertical axis, the functionality is impaired. It can be attached to the box body 4 without

Further, since a plurality of speaker devices 1, 1, . . . electrically connected by a plurality of wiring cables 91, 91, . does not interfere with the output of the speaker 6 of the other speaker device 1.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and any changes or additions within the scope of the present invention are included in the present invention. be

For example, although the speaker device 1 is installed on the panel member 10 and used so that the conversation voice in the booth B does not leak to the outside, it is not limited to this and may be installed on a place other than the panel member 10. It may be used for purposes other than prevention of leakage of conversation voice to the outside.

Also, although the speaker device 1 is described as being installed on the upper surface of the panel member 10, the present invention is not limited to this, and the speaker device 1 may be installed on another surface of the panel member.

Also, although the box 2 has been described as extending in the left-right direction and forming a substantially rectangular parallelepiped, it is not limited to this, and may form a square, an ellipse, or the like in a plan view, for example.

Further, although the openings 31 are formed continuously from the front and rear of the left and right ends of the top plate 3 to the left and right outer sides, the openings 31 are not limited to this, and are formed only in the front and rear of the left and right ends of the top plate 3 . may be

Further, regarding the fixing of the speaker device 1 to the panel member 10, it has been described that the pedestal hole 45 is engaged with a screw or a nail fixed to the panel cover 13. However, the present invention is not limited to this. It's okay.

Further, although it has been described that the wiring cable 91 can be electrically connected by elastically pinching the bare copper wire at the end of the cable 91 with the connector 9, the type of connector is not limited to this. may be inserted into an insertion hole formed in the

Moreover, although the position of the connector 9 has been described as being disposed below the box 4, it is not limited to this and may be, for example, on the rear side.

Further, although it has been described that the two connectors 9, 9 are arranged on the lower surface of the box 4 at substantially equal distances from the center in the left-right direction, the present invention is not limited to this. may be arranged adjacent to each other, or two connectors may be arranged adjacent to each other on one of the left and right sides.

Also, although it has been described that the speaker device 1 is provided with two connectors 9, 9, the present invention is not limited to this, and there may be three or more connectors.

Also, although the speaker 6 has been described as facing upward, it is not limited to this and may not be facing upward.

Moreover, although the structure in which the distribution cables 91, 91 extend to the left and right as shown in FIG. 4 has been described, the distribution cables 91, 91 may be extended so as to be collected in the lower center as shown in FIG. 10 .

1, 1' speaker device 2 box 3 top plate 4 box body (box)
5 baffle plate (box)
6, 6' Speaker 7, 7' Transformer 8 Substrate 9, 9' Connector 10 Panel member 11 Amplifier 13 Panel cover 14 Notch 31 Opening 47 Groove 48 Inclined surface 91 Wiring cable 91a-c Wiring cable

Claims (5)

A speaker device attached to a panel member that partitions a space,
The box in which the speaker is housed has two connectors with two poles that can be electrically connected from the outside of the box,
the speaker and the two connectors are electrically connected in parallel for each pole inside the box;
The box is a substantially rectangular parallelepiped extending in the left-right direction, the connector is arranged on the lower surface thereof, and the connector is connected to the wiring cable from the outside of the box,
The speaker device is fixed on the panel cover so as to extend across two adjacent panel covers provided on the upper part of the panel member, and the two speaker devices are mounted on at least one of the two panel covers. and a notch through which the wiring cable is inserted is formed in a connecting portion of two panel covers. The two connectors are arranged in two receptacles formed on the lower surface of the box in a laterally spaced manner, respectively, and have a structure for guiding the distribution cable inwards in the left and right directions. Item 1. The speaker device according to item 1. 3. The speaker device according to claim 1, wherein the box has a recessed groove extending in the left-right direction on the lower surface thereof. 4. The speaker device according to any one of claims 1 to 3, wherein said speaker device has a transformer inside said box, and said transformer is electrically connected between said connector on one side and said speaker. A speaker device as described. 5. The speaker device according to claim 1, wherein the box has a front-to-rear width of 25 to 40 mm, a left-to-right width of 200 to 300 mm, and an internal volume of 100 to 120 cm ^<3> .

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