JP2009260763A - Flat speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excellent thin and flat speaker to be installed on a ceiling surface or a wall surface configuring a living space, and for preventing sound leak to an adjacent room or upstairs when the flat speaker is mounted on the wall or ceiling. <P>SOLUTION: This flat speaker is installed on a ceiling surface or a wall surface which does not give any influence to an adjacent room or upstairs by joining a flat diaphragm 203 to the opening edge surface of a frame 201, and setting the inside of the speaker to a closed state to such an extent that any sound can be prevented from leaking to the outside, and the flat diaphragm 203 is configured to move up and down at a horizontal flat part 202a of a cylindrical transmission member 202 joined to a voice coil 103. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a flat speaker, and more particularly to a structure of a flat speaker that is installed and used on a wall or ceiling of a living space composed of a building material such as a house, condominium, or office building.

  A conventional flat speaker will be described with reference to a side sectional view of FIG.

  According to the figure, reference numeral 101 denotes a frame made of steel or the like and having a plurality of holes, and a magnetic circuit 102 is bonded to the frame 101 by bonding a lower plate 102a, an annular magnet 102b, and an annular upper plate 102c. Is configured.

  The magnetic circuit 102 has a magnetic gap 102e between a center pole 102d which is a central projecting portion of the lower plate 102a and the upper plate.

  In addition, a cylindrical voice coil 103 arranged so that one end is positioned in the magnetic gap 102e of the magnetic circuit 102 is inserted.

  Reference numeral 104 denotes a support part in which an inner circumference is joined to the voice coil 103 and an outer circumference is joined to the frame 101 so as to hold the voice coil 103 at the center of the magnetic gap.

  Reference numeral 105 denotes an inverted conical coupling cone joined to the upper portion of the voice coil 103, and an end portion of the coupling cone 105 not joined to the voice coil 103 and the flat plate diaphragm 106 are joined. Yes. The outer periphery of the flat diaphragm 106 is joined to the inner periphery of the edge portion 107, and the outer periphery of the edge portion 107 is joined to the frame 101.

As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
JP-A 63-262000

  However, in the above-described conventional configuration, the edge portion 107 protrudes or is recessed from the flat plate diaphragm 106, or even if the speaker surface is covered with a cross in order to make the presence of the speaker inconspicuous. The wall material and ceiling to be used have a different texture, and the position of the speaker placed on the wall or ceiling can be easily recognized by the listener, and there has been a problem in providing an image of an acoustic wall or an acoustic ceiling.

  In addition, since the coupling cone 105 suppresses the influence of eccentricity at the time of joining with the flat plate diaphragm 106, the coupling cone 105 is avoided from being enlarged in order to locate the joint point outside the flat plate diaphragm. As a result, height is required, the thickness of the speaker increases, and when installed on a wall or ceiling, the speaker protrudes prominently in the wall or ceiling, so other wiring and piping work In order to facilitate the smoothing of the speaker, there has been a demand for a thinner speaker.

  The present invention solves the above-mentioned conventional problems, and when installed in a residential space composed of building materials such as a house, condominium, office building, etc., without making the residential space feel uncomfortable, and to the ceiling It is possible to provide a flat panel speaker that does not increase the distance from the upper floor when installing the projector, and the distance from the adjacent room when installed on the wall.

  In order to solve the above-described problems, a speaker according to the present invention includes at least a rectangular flat plate diaphragm, a frame that joins the periphery of the flat plate diaphragm and an opening end surface to form a substantially sealed space, and the substantially sealed case. A magnetic circuit mounted on the substantially inner center bottom of the frame forming a space, a voice coil having one end arranged in the magnetic gap of the magnetic circuit, and a lower end side joined to an upper end side of the voice coil, and an upper end The formed horizontal flat part is composed of a cylindrical transmission member joined to the flat diaphragm, and the conventional edge part is deleted so that the listener in the room does not visually recognize the presence of the speaker. There is no sense of discomfort in the room due to the presence, and the back side of the flat plate diaphragm is a sealed space that does not leak sound, so sound leakage from the back can be suppressed, and the floor and adjacent rooms Since the sound measure can be made relatively simple, and the flat plate diaphragm is vibrated on the surface by the cylindrical transmission member provided with the horizontal flat portion, the sound is emitted. Since the central portion of the diaphragm is vibrated up and down, the overall height of the cylindrical transmission member can be made lower than that of the coupling cone, and the speaker can be made thinner.

  The flat speaker of the present invention does not give an uncomfortable feeling that the speaker is apparently installed on the ceiling or the wall surface because the edge portion is not visually recognized on the surface. Without using a coupling cone, a flat plate diaphragm and a voice coil are joined by a cylindrical transmission member with a horizontal flat part to achieve a thinner profile. Eliminates the possibility of designing ceilings and walls, and flat speakers do not impose design constraints, increasing design freedom and reducing obstacles to wiring and piping work in home construction. is there.

  In addition, it is possible to suppress the emission of reverse phase sound from the back of the speaker to the surrounding space, and when installed on a wall, ceiling, etc., there is also an effect that sound leakage to an adjacent room, upper floor, etc. hardly occurs.

(Embodiment 1)
Hereinafter, a flat speaker according to an embodiment of the present invention will be described with reference to FIGS.

  1A is a plan view of a flat speaker according to Embodiment 1 of the present invention, FIG. 1B is a structural cross-sectional view taken along line AA ′ of FIG. 1A, and FIG. 2 is the same embodiment. It is structural sectional drawing which shows the example of the other flat speaker in.

  1 and 2, the same components as those in FIG. 9 are denoted by the same reference numerals, and description thereof is omitted.

  In the figure, reference numeral 201 denotes a frame made of a thin steel material or the like, and this frame 201 is not provided with a gap, a seam, or a hole that allows air to flow in and out. Reference numeral 203 denotes a lightweight rectangular flat diaphragm, which is made of a material such as foamed resin, wood, or metal. The outer peripheral end surface of the flat plate diaphragm 203 and the outer peripheral end surface of the frame 201 are joined by a bonding means such as an adhesive, and the space formed by the flat plate diaphragm 203 and the frame 201 is sealed so as not to leak sound. (It is desirable that the adhesive maintains elasticity even in a solid state).

  202 is a metallic cylindrical transmission made of a thin plate of aluminum or the like having a horizontal flat portion 202a joined to the inner wall of the voice coil 103 on the lower end side and a horizontal flat portion 202a joined to the center portion of the flat plate diaphragm 203 on the upper end side. This is a member that generates sound by vibrating the flat diaphragm 203 by the driving force generated from the voice coil 103 and the magnetic circuit 102.

  The horizontal flat portion 202a at the upper end of the cylindrical transmission member 202 has a circular or polygonal shape.

  According to such a configuration, the frame 201 and the plate diaphragm 203 are joined to each other together with other ceiling materials and wall materials on the ceiling and wall surface without using the edge portion 107 of the prior art. When the speaker of the form is installed, the presence of the speaker of the present embodiment can be visually recognized by using a ceiling material or wall material having the same texture and hue as the surface or surface cloth of the flat diaphragm 203. As a result, it is possible to improve the interior of the speaker as having no design restrictions.

  Further, by joining the flat diaphragm 203 and the voice coil 103 using the cylindrical transmission member 202, the flat diaphragm 203 can be compared with the case where the coupling cone 105 of the conventional speaker is used. Since the central portion is configured to move up and down by the horizontal flat portion 202a of the cylindrical transmission member 202, the thickness of the entire speaker can be reduced, and the living space composed of building materials such as a house, apartment, office building, etc. When installed inside, the space factor during installation is wider than that of conventional flat speakers, and it is possible to alleviate obstacles to wiring and piping work in housing construction in the space between the wall with the adjacent room and between the ceiling and the floor Is.

  Further, the space formed by the flat plate diaphragm 203 and the frame 201 is sealed so as not to leak sound, thereby suppressing the emission of reverse phase sound from the back of the speaker (the flat plate plate 203) to the surrounding space. When installed on walls, ceilings, etc., it suppresses sound leakage to adjacent rooms, upper floors, etc.

  In this embodiment, foamed resin, wood, and metal are used as the material of the flat diaphragm 203. However, materials such as paper and glass may be used, and new materials such as honeycomb panels and aluminum composite plates are used. However, the same effect can be obtained.

  In the present embodiment, the cylindrical transmission member 202 is made of a metal such as aluminum, but the same effect can be obtained by using a material such as resin.

  Furthermore, the outer peripheral end surface of the flat plate diaphragm 203 and the outer peripheral end surface of the frame 201 are joined by a double-sided adhesive material 301 having a cushioning thickness, so that the reflected wave at the outer peripheral end of the flat plate diaphragm 203 is obtained. It is possible to reduce the loss of the frequency, suppress the disturbance of the frequency characteristics, and absorb the assembly error.

  In this embodiment, since the frame 201 and the plate diaphragm 203 are joined, sound is reproduced using a plurality of divided resonances generated on the surface of the plate diaphragm 203. (Frequency peaks and dips occur in the frequency characteristics of loudspeakers using split resonance. However, it is possible to control the vibration mode by dispersing the resonance by reinforcing the inside of the plate diaphragm 203 or the like. .)

(Embodiment 2)
A flat speaker according to another embodiment of the present invention will be described with reference to FIGS.

  FIG. 3 is a structural cross-sectional view of a flat speaker according to Embodiment 2 of the present invention, and FIGS. 4 to 6 are structural cross-sectional views showing examples of another flat speaker according to the same embodiment. 3 to 6, the same components as those in FIGS. 1, 2, and 9 are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 3, the difference from the first embodiment is that a band-shaped elastic material 401 is placed along the outer periphery of the flat plate diaphragm 203 in a space formed by the flat plate diaphragm 203 and the frame 201. It is the point which arrange | positions and the said flat diaphragm 203 and the said frame 201 are joined via this strip | belt-shaped elastic material 401. FIG. In addition, as a material of the said strip | belt-shaped elastic material, rubber | gum, an elastomer, cloth, etc. are mentioned.

  With this configuration, it is possible for the flat diaphragm 203 to perform more piston movement in accordance with the movement of the voice coil 103 as compared with the flat speaker of the first embodiment, and to suppress disturbance of frequency characteristics. An effect is obtained.

  Further, as shown in FIG. 4, the outer peripheral portion of the belt-shaped elastic member 401 along the longitudinal direction and the flat plate diaphragm 203 are joined, and the inner periphery of the belt-shaped elastic member 401 along the longitudinal direction. By joining the frame and the frame 201, a space can be provided around the outer periphery of the frame 201, and attachment to the wall / ceiling is possible.

  Further, as shown in FIG. 5, by using an elastic material 501 in which the cross-sectional shape in the short direction of the band-shaped elastic material 401 has a wavy uneven cross section, linearity in the piston motion of the plate diaphragm 203 is obtained. Can be improved.

  In addition, as shown in FIG. 6, by using an elastic material 601 in which the cross-sectional shape of the belt-shaped elastic material 401 in the short direction is an arc shape, the linearity in the piston motion of the plate diaphragm 203 is improved. can get.

(Embodiment 3)
A flat speaker according to another embodiment of the present invention will be described with reference to FIG.

  FIG. 7 is a plan view of a cylindrical transmission member which is a main part of another embodiment of the flat speaker of the present invention. In FIG. 7, the same components as those in FIGS. 1 to 6 and FIG.

  In FIG. 7, the difference from Embodiments 1 and 2 is that the shape of the horizontal flat portion 701a at the upper end of the cylindrical transmission member 701 is a non-circular shape. FIG. 7A shows an elliptical shape, and FIG. 7B shows a starfish shape.

  With this configuration, the vibration mode generated on the surface of the flat plate diaphragm 203 joined to the upper horizontal flat portion 701a of the cylindrical transmission member 701 has an irregular shape in accordance with the shape of the horizontal flat portion 701a. Therefore, the disturbance of the frequency characteristics can be suppressed without performing special processing on the flat plate diaphragm 203. That is, in each of the above-described embodiments, the flat plate diaphragm 203 is also a square having a rectangular shape in addition to the square shape of the panel used for the ceiling and wall surface, but the horizontal flat portion 701a is implemented. The horizontal flat portion 701a is elliptically shaped so that the divided resonance frequency generated in the case of a circular shape as in the first embodiment becomes a specific frequency between the flat plate diaphragm 203 and the frequency sound pressure characteristic with a remarkable peak depth. As a non-circular shape such as a shape, the split resonance frequency is dispersed to suppress the occurrence of specific and significant peak depth, thereby contributing more to sound emission.

(Embodiment 4)
A flat speaker of another embodiment different from the above-described embodiments will be described with reference to FIG.

  FIG. 8 is a structural cross-sectional view of a flat speaker according to another embodiment. In FIG. 8, the same components as those in FIGS. 1 to 7 and FIG.

  In FIG. 8, the difference from Embodiments 1 to 3 is that the magnetic gap of the magnetic circuit 102 is filled with a magnetic fluid 801 that reacts to the magnetic field, and the magnetic field generated by the magnetic circuit 102 is used. Thus, the voice coil 103 is held at the center of the magnetic gap.

  With this configuration, a configuration in which the support portion 104 used in the related art and Embodiments 1 to 3 is eliminated is possible, and a further reduction in thickness can be realized.

  Since the flat speaker according to the present invention does not have anything that reveals the presence of the speaker on the surface of the flat diaphragm, it is possible to improve the degree of freedom of the arrangement position with respect to the wall and ceiling material and to suppress the thickness of the flat speaker. In addition, it is possible to prevent obstacles to wiring and piping work in the narrow gaps of walls and ceilings as a residence, and to suppress the emission of reverse phase sound from the back of the speaker to the surrounding space. It is useful as an acoustic device installed in a living space composed of building materials such as houses, condominiums, and office buildings.

(A) Plan view of the flat speaker according to Embodiment 1 of the present invention, (b) Structural sectional view taken along the line AA ′ of FIG. Structural sectional view showing an example of another flat speaker in the same embodiment Cross-sectional view of the structure of a flat speaker according to Embodiment 2 of the present invention Structural sectional view showing an example of another flat speaker in the same embodiment Structural sectional view showing an example of another flat speaker in the same embodiment Structural sectional view showing an example of another flat speaker in the same embodiment (A) Plan view of the cylindrical transmission member according to the first embodiment of the present invention, (b) Plan view of the cylindrical transmission member according to the third embodiment of the present invention. Cross-sectional view of the structure of a flat speaker according to Embodiment 4 of the present invention Structural sectional view showing an example of a conventional flat speaker

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Frame 102 Magnetic circuit 103 Voice coil 104 Support part 105 Coupling cone 106 Flat plate vibration plate 107 Edge part 201 Frame 202 Cylindrical transmission member 202a Horizontal flat part 203 Flat plate vibration plate 301 Double-sided adhesive material 401 Band-shaped elastic material 501 Elastic material 601 Elasticity Material 701 Cylindrical transmission member 801 Magnetic fluid

Claims (6)

Mounted on at least a rectangular plate diaphragm, a frame that forms a substantially sealed space inside by joining the periphery of the plate diaphragm and the opening end face, and a substantially inner bottom portion of the frame that forms the substantially sealed space. A magnetic circuit, a voice coil having one end disposed in the magnetic gap of the magnetic circuit, and a cylinder in which a lower end side is joined to the upper end side of the voice coil, and a horizontal flat portion formed at the upper end is joined to the flat diaphragm. Flat speaker composed of a transmission member. The flat speaker according to claim 1, wherein an elastic member is joined between the flat diaphragm and the frame. The flat speaker according to claim 2, wherein the elastic member is a double-sided adhesive material having cushioning properties. The flat speaker according to any one of claims 1 to 3, wherein a shape of the horizontal flat portion of the cylindrical transmission member is a non-circular shape. The flat speaker according to claim 1, wherein a magnetic fluid is filled in the magnetic gap. The flat speaker according to any one of claims 1 to 5, wherein at least a rectangular flat diaphragm has a surface texture similar to that of an adjacent wall material or ceiling material and has the same hue.

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