JP2010068171A - Speaker unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a configuration of a speaker unit dispensing with a speaker box, which prevents leakage of sound to the rear side of a speaker, with controlling of capability of reproducing low frequency sound being possible. <P>SOLUTION: At least one acoustic tube 12 is arranged in the internal space of a frame 11 in the speaker. A tip part of the acoustic tube 12 protrudes upward from the side surface of a frame 11. The frame 11 has such shape as a gap or a hole is eliminated, except for the inserting place of the acoustic tube. So, the internal space is almost closed one, on the rear side of a diaphragm 6, except for the portion of the acoustic tube 12. With this configuration, leaking of sound to the rear side of the speaker is prevented, and the capability of reproducing the sound of predetermined low frequency is adjusted by properly setting the length of the acoustic tube. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a speaker device used in a living space composed of a building material such as a house, a condominium, and an office building.

  A speaker device mounted on the ceiling or wall of a conventional house or office will be described with reference to FIGS. 6A is a perspective view from the upper surface of the speaker which is the speaker device main body, FIG. 6B is a top view thereof, FIG. 6C is a cross-sectional view taken along line AA ′ of FIG. 6D is a cross-sectional view taken along the line BB ′ of FIG. 6B, and FIG. 6E is an explanatory diagram of the speaker device to which the speaker is attached.

  According to the figure, reference numeral 1 denotes a frame having a plurality of holes made of steel or the like, and a magnetic circuit 2 in which a lower plate 2a, an annular magnet 2b, and an upper plate 2c are bonded and bonded to the frame 1 is joined. Yes.

  A magnetic air gap 2f is provided between the inner peripheral side surfaces of the lower plate 2a and the upper plate 2c of the magnetic circuit 2, and a cylindrical voice coil bobbin 3 around which a voice coil 4 is wound is inserted.

  Reference numeral 5 denotes a support, which has an inner periphery adhesively bonded to the voice coil bobbin 3 and an outer periphery adhesively bonded to the frame 1 to hold the voice coil bobbin 3 at the center of the magnetic gap 2f.

  Further, a diaphragm 6 is joined to the upper part of the voice coil bobbin 3, and a dust cap 8 for dust prevention is joined to the center part of the diaphragm 6 (upper part of the cylindrical voice coil bobbin 3). Yes.

  Furthermore, an edge portion 7 is joined to the outer periphery of the diaphragm 6, and the side of the edge portion 7 not joined to the diaphragm 6 is joined to the frame 1.

  Reference numeral 9 denotes a hollow port formed integrally with the frame 1.

  The speaker 10 configured as described above is attached to the speaker box A to form a speaker device.

  The speaker box A to which the speaker 10 is attached is entirely shielded except for the portion where the speaker 10 is attached, and by attaching the speaker 10, the inside and outside are shielded except for the port 9 to form a speaker device. .

As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
JP 58-33393 A

  However, in the above conventional speaker device, when used on the ceiling or wall of a house or office, the speaker box 11 can be used to prevent sound leakage to the adjacent room or the floor, but the cost of the speaker box 11 is high. The problem is that the size of the entire system also increases.

  When the speaker box A is not used, sound leakage cannot be prevented, and the sound in the back direction of the speaker 10 is in reverse phase. There is a problem that sound deterioration is caused by canceling out sound with opposite phase.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and provides a speaker that can prevent the reproduction sound from being deteriorated due to the reverse-phase sound without using the speaker box A and can adjust the reproduction ability of the low sound. It is the purpose.

  In order to solve the above problems, a speaker device according to the present invention has a bottomed frame having an open end, and the open end is joined by a diaphragm and the edge portion to seal the internal space of the frame. In the speaker device, an acoustic tube is disposed in the sealed space, a tip portion of the acoustic tube is protruded from the frame, and a sound emission direction thereof is set to be the same direction as a vibration direction of the diaphragm. The sound tube reverses the phase of the sound in the direction of the back of the diaphragm by 180 °, and the sound emission direction is the same as the sound emission direction of the speaker in order to increase sound pressure and prevent sound leakage to the other. Furthermore, by appropriately setting the length of the acoustic tube, it is possible to enhance a predetermined low sound range, and it can be provided as a small and inexpensive speaker device.

  The speaker device according to the present invention has an effect that the sound tube can be confined without using the speaker box by providing the acoustic tube inside the frame of the sealed structure, and the cost can be reduced and the size of the entire system can be suppressed. In addition, there is also an effect that the bass reproduction of the system can be easily adjusted by changing the inner volume of the frame and the cross-sectional area and length of the acoustic tube.

  A speaker device according to an embodiment of the present invention will be described below with reference to FIGS.

  In the description, the same parts as those in the prior art are denoted by the same reference numerals, and description thereof is omitted.

(Embodiment 1)
Hereinafter, the first aspect of the present invention will be described with reference to the first embodiment.

  FIG. 1 is a structural cross-sectional view of a speaker device according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view of an acoustic tube as the main part.

  According to the figure, reference numeral 11 denotes a bottomed frame provided with a hole for mounting the magnetic circuit 2 in the center with an opening at the top, and the frame 11 has a hole 11a through which an acoustic tube 12 described later is inserted. It is provided on the side. Except for the hole 11a and the hole at the center of the bottom surface, the frame 11 is not subjected to other holes or similar processing.

  Accordingly, the magnetic circuit 2 is adhesively bonded to the frame 11 so as to cover the opening of the frame 11, the inner periphery of the diaphragm 6 is adhesively bonded to the voice coil bobbin 3, and the outer periphery is connected via the edge 7. The diaphragm 6 is bonded to the opening end of the frame 11 and the outer periphery of the dust cap 8 and the diaphragm 6 are bonded to cover the upper opening of the cylinder of the voice coil bobbin 3. The space formed by the frame 11 is formed in a substantially sealed state except for the hole 11a.

  The acoustic tube 12 inserted through the hole 11 a of the frame 11 is bent in the movement direction (vertical direction) of the diaphragm 6, and the sound generation on the back side of the diaphragm 5 is generated on the outer periphery of the frame 11. Sound is emitted upward from the gap.

  The acoustic tube 12 is a rectangular tube made of metal or resin, and at least one or more acoustic tubes 12 are disposed in the internal space of the frame 11.

  In this embodiment, the acoustic tube 12 is securely fixed on the frame 11, and the vibration of the diaphragm 6 does not cause an abnormal operation such as vibration.

  According to such a configuration, the frame 11 is not provided with a gap, a seam, or a hole other than a hole for projecting the distal end portion of the acoustic tube 12, and therefore when the diaphragm 6 is driven (vertically vibrated). The sound emitted from the acoustic tube 12 is directed upward, and sound leakage to the back of the speaker can be prevented.

  In addition, it is possible to adjust the bass reproduction capability by appropriately selecting the cross-sectional area and length of the acoustic tube 12 and using the resonance sound in the acoustic tube 12 using the principle of Helmholtz resonance.

  The shape of the acoustic tube 12 is not necessarily the rectangular cylinder described above, and the same effect can be obtained even with other shapes such as a cylinder.

(Embodiment 2)
The second embodiment is another embodiment different from the first embodiment described above. In particular, the invention of the speaker device according to claim 2 will be described. FIG. FIG. 3B is a structural cross-sectional view taken along the line AA ′ of FIG. 3A, and FIG. 4 is a structural cross-sectional view of the same development example.

  According to the figure, the difference from the first embodiment is that the slit 17a of the edge portion and the slit 21a of the frame that match the shape of the distal end portion of the acoustic tube 12 are provided on the outer peripheral portion of the edge portion 17 and the outer peripheral portion of the frame 21. Each is provided, and the tip of the acoustic tube 12 is joined to the slits 17a and 21a.

  With this configuration, by supporting the acoustic tube 12 at a plurality of locations, a sense of stability of the acoustic tube 12 is increased, and the distal end of the acoustic tube 12 protrudes outward from the outer peripheral portion of the frame 21. The appearance from the front of the speaker is not uncomfortable.

  FIG. 4 shows a development example of the speaker device of the present embodiment, in which the diaphragm is a flat diaphragm 6a. By making the diaphragm 6a into a flat plate shape, the present embodiment in which the acoustic tube 12 is not protruded outward from the frame 21 becomes more uncomfortable.

  Furthermore, in the speaker device of the present embodiment and the development example, the tip of the acoustic tube 12 or the slit 17a or the slit 21a has air permeability that has the same color or pattern as the diaphragm 6 or 6a. By joining the cloth or the sheet member, the speaker device itself and the slit portion can be made inconspicuous, and the interior property of the living space can be maintained.

(Embodiment 3)
The third embodiment describes a speaker device according to another embodiment which is different from the first and second embodiments. In particular, the present invention described in claims 3 and 4 will be described. FIG. 5A is a structural sectional view of the speaker device according to the other embodiment of the present invention, and FIG. 5B is a structural sectional view of the speaker device of the same development example.

  The difference between the first and second embodiments will be described with reference to the same drawing. The present embodiment does not have the edge portion 7, and the outer peripheral portion of the frame 21b and the flat diaphragm 6b are directly connected. At the point of joining.

  With this configuration, the speaker can be made inconspicuous, and the appearance of the living space is not impaired when the speaker is installed on the ceiling or wall.

  In the present embodiment, an internal magnet type magnetic circuit 2d is used.

  Further, as in the speaker device of the development example shown in FIG. 5B, by attaching a molding 23 made of a breathable material such as cloth to the tip of the acoustic tube 12, an adjacent ceiling material or wall material 30 is attached. Can be concealed, and the speaker device can be made inconspicuous, and when the speaker device is installed on the ceiling or wall, the speaker device does not stand out as a part of the wall or ceiling. It is also possible to unify the external appearance.

  In the speaker device according to the present invention, the acoustic tube is disposed in the internal space of the frame having the sealed structure, so that the sound deterioration due to the reverse phase sound of the diaphragm can be achieved without using the speaker box, and the back of the speaker. It is possible to reduce the cost of the speaker box because it is possible to prevent sound leakage and adjust the bass reproduction capacity, and it is a residence made of building materials such as houses, condominiums, office buildings, etc. It is also useful as a speaker used in space or as an acoustic device mounted on an AV device such as a television.

Cross-sectional view of the structure of a speaker device according to an embodiment of the present invention The perspective view of the acoustic tube which is the principal part (A) A plan view of a speaker according to Embodiment 2 of the present invention, (b) a structural cross-sectional view taken along line A-A ′ of FIG. Cross-sectional view of another speaker structure in the same embodiment (A) Structural cross-sectional view of the speaker in Embodiment 3 of the present invention, (b) Structural cross-sectional view of another speaker in the same embodiment (A) A perspective view of a conventional speaker, (b) a top view thereof, (c) a sectional view taken along line AA ′ of FIG. 6 (b), and (d) BB ′ of FIG. 6 (b). (E) Perspective view of a conventional speaker device

Explanation of symbols

2 Magnetic circuit 3 Voice coil bobbin 4 Voice coil 5 Support part 6 Diaphragm 7, 17 Edge part 11, 21, 21b Frame 12 Acoustic tube 17a, 21a Slit

Claims (4)

A bottomed frame having an open end, a magnetic circuit fixed to the bottom of the frame, a voice coil bobbin disposed in a magnetic gap of the magnetic circuit, and a voice coil wound around the voice coil bobbin And a support part for holding the voice coil bobbin in the magnetic gap, a diaphragm joined to the voice coil bobbin that vibrates by a driving force generated from the magnetic circuit and the voice coil, and an outer peripheral part of the diaphragm And a speaker device comprising an edge portion joined at an opening end side of the frame, wherein at least one or more sound is provided in an inner space of the sealed frame formed by the diaphragm and the edge portion. A tube is arranged, and the tip of the acoustic tube protrudes from the frame, and the sound emission direction is the same as the vibration direction of the diaphragm. And the speaker device. The speaker device according to claim 1, wherein a slit having the same shape as the shape of the distal end portion of the acoustic tube is provided in a joint portion between the outer peripheral portion of the edge portion and the frame, and the distal end portion of the acoustic tube is joined to the slit. The speaker device according to claim 1 or 2, wherein the diaphragm is a flat diaphragm. The speaker device according to claim 3, wherein the tip of the acoustic tube is covered with a molding having air permeability.

Images