JP2009118021A - Voice coil assembly and loudspeaker using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a voice coil assembly capable of achieving a flat thin loudspeaker having a high efficiency, reduced divided vibrations, flat frequency characteristics, and reduced operation defects. <P>SOLUTION: The voice coil assembly includes a plurality of internal-winding voice coils, each including a rectangular bobbin having a rectangular cross section and a rectangular space therein and an internal rectangular coil fixed to an inner wall surface defining the rectangular space of the rectangular bobbin, wherein an outer wall surface of the rectangular bobbin of one internal winding voice coil is closely-attached and fixed to an outer wall surface of the rectangular bobbin of another internal winding voice coil. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a speaker including a magnetic circuit using a plurality of magnets, a speaker vibration member using a bobbin and a plurality of coils, and more particularly to a flat thin speaker having a thin overall height.

  In an electrodynamic speaker that converts an audio signal into audio, there is a speaker that employs a flat diaphragm as a speaker diaphragm in order to keep the total height including a magnetic circuit low. Although the overall height of the flat diaphragm is lower than that of the cone diaphragm, the rigidity tends to be insufficient to vibrate integrally without split vibration. Therefore, there is a speaker that has a plurality of voice coils in a bobbin that is fixed to a planar diaphragm, and drives the planar diaphragm with the plurality of voice coils to suppress divided vibration. Conventionally, a speaker including a flat diaphragm having a plurality of coils and a magnetic circuit using a plurality of magnets corresponding to each coil may be used as a flat thin speaker having a thin overall height.

  As a flat thin speaker having a thin overall height, there is a speaker in which a plurality of coils are arranged in a deep groove provided in a flat diaphragm having irregularities, and the coils are arranged in a magnetic gap formed between a plurality of magnets (Patent Document 1). Here, each coil is formed by separating a coil wound around a track type in a separation step, and this is loaded and bonded to a flat diaphragm. Further, there is a flat speaker that includes a bobbin formed by vacuum forming a plastic thin plate and inserts a coil into the slit of the bobbin (Patent Document 2). Since these arrange | position a coil in the place with the highest magnetic flux density called the magnetic space | gap of a magnetic circuit, the efficiency of a planar speaker can be improved. However, in a flat thin speaker with a thin overall height, when forming a bobbin in which a plurality of coils are arranged in a magnetic gap, it is necessary to make the bobbin lightweight and rigid for good sound reproduction. .

  In addition, the voice coil has a rectangular shape, and a plurality of the rectangular voice coils are joined together in the vertical and horizontal sides to form an aggregate, and the aggregate is attached to a flat plate diaphragm. There is a flat type speaker driven by (Patent Document 3). As shown in FIG. 3 of Patent Document 3, this speaker includes a plurality of magnetic circuits configured by sandwiching a magnet between the long side portions of a pair of band-shaped yokes, and the length of the other side of the band-shaped yokes of the magnetic circuit. A large number of voice coils are arranged so that one side of each voice coil is inserted between the sides. In Patent Document 3, a voice coil assembly is formed by winding a coil around a frame body so that the voice coil is formed into a square shape, and thereafter, a plurality of these are assembled by joining the vertical and horizontal sides thereof. It is described as being in the body.

  However, as long as it is shown in FIG. 2 of Patent Document 3, in this conventional voice coil assembly, each voice coil is wound around the outside of the frame corresponding to the bobbin. Even if the coils are joined to each other, adjacent bobbins constituting the voice coil assembly are separated by the thickness of the voice coil wound around the outside and cannot be brought into close contact with each other. When the bobbin has insufficient rigidity, there is a problem that the bobbin vibrates and divides, or the adjacent bobbins come into contact with each other to generate an abnormal noise. An additional weight such as an adhesive for connecting the two is required. As a result, there is a problem that the speaker diaphragm becomes heavy and the reproduction efficiency of the speaker is lowered.

  Conventionally, a voice coil in which a coil is wound on the inner diameter side of a bobbin is disclosed together with a method for reducing the number of winding steps when the coil is wound on the inner diameter side of a cylindrical bobbin (Patent Document). 4).

JP-A-60-18098 JP 63-299500 A Japanese Utility Model Publication No. 55-88590 JP-A-7-131892

  The present invention has been made in order to solve the above-described problems of the prior art. The purpose of the present invention is to provide a high frequency efficiency, a flat frequency characteristic that is difficult to generate divided vibrations, and a malfunction. An object of the present invention is to obtain a voice coil assembly capable of realizing a flat and thin speaker that does not easily occur.

  A voice coil assembly according to the present invention includes a rectangular bobbin having a rectangular cross section and a rectangular space inside, and an internally wound rectangular coil fixed to an inner wall surface defining the rectangular space of the rectangular bobbin. A plurality of inner winding voice coils are provided, and the outer wall surface of the rectangular bobbin of one inner winding voice coil and the outer wall surface of the rectangular bobbin of the other inner winding voice coil are firmly fixed by a band member and an adhesive.

  Preferably, in the voice coil assembly according to the present invention, two inner wound voice coils in which the outer wall surfaces of the rectangular bobbins are fixed in close contact with each other are arranged with two rectangular bobbins in close contact with each other. Are connected so that the audio signal current is conducted in the same direction on one side of the inner coil and the other side of the other inner coil.

  More preferably, in the voice coil assembly of the present invention, the rectangular bobbin is made of a kraft paper, a spiral paper paper material, a capton, a sill, a teal resin material, or a metal material containing aluminum or titanium. It is made of any material.

  The voice coil assembly of the present invention has a lattice bobbin whose cross-sectional shape is formed in a lattice shape and has a plurality of rectangular spaces inside, and a plurality of voice coil assemblies fixed to an inner wall surface defining the rectangular space of the lattice bobbins. An inner winding rectangular coil, and two inner winding voice coils fixed to the inner wall surfaces of two adjacent rectangular spaces, one side of one inner winding rectangular coil disposed across the inner wall surface, On one side of the other internally wound rectangular coil, the audio signal current is connected in the same direction.

  Preferably, in the voice coil assembly of the present invention, the lattice bobbin is either a papermaking material, a polyimide, a polyetherimide, a liquid crystal polymer resin material, or a metal material containing aluminum or titanium. Made of material.

  More preferably, the voice coil assembly of the present invention further includes a tinsel wire connected to the input end and the output end where the plurality of internal windings are connected to each other.

  Further, the speaker of the present invention includes the above voice coil assembly, a speaker diaphragm fixed to the voice coil assembly, an edge that supports the outer periphery of the speaker diaphragm so as to vibrate, an outer periphery of the edge, and a magnetic field. A plurality of magnets that are magnetized and arranged so that their magnetic poles are adjacent to each other and their magnetic poles are different from each other. And a plurality of magnets and a yoke to be fixed, and the inner rectangular coil of the voice coil assembly is disposed in a magnetic gap formed between adjacent plates and between the plates and the yoke. Yes.

  The operation of the present invention will be described below.

  The voice coil assembly according to the present invention includes a case where a plurality of inner winding voice coils including a rectangular bobbin and an inner winding rectangular coil are fixed in close contact with each other, and a plurality of inner coils on a lattice bobbin whose cross-sectional shape is a lattice. There are cases where the wound rectangular coil is formed in close contact. That is, in the former voice coil assembly, the inner wound rectangular coil is fixed to the inner wall surface defining the rectangular space of each rectangular bobbin, and the outer wall surface of the rectangular bobbin of one inner wound coil and the other inner coil The outer wall surface of the rectangular bobbin of the wound voice coil is fixed tightly with a band member and an adhesive. Further, in the latter voice coil assembly, the lattice bobbin has a plurality of rectangular spaces, and the internally wound rectangular coils are fixed to the inner wall surfaces defining the respective rectangular spaces.

  For example, each of the internally wound voice coils constituting the former voice coil assembly includes a rectangular bobbin having a rectangular cross section and a rectangular space inside, and the rectangular bobbin is made of kraft paper or spiral paper. It is made of any one of a paper material, a resin material of capton, siller, and till, or a metal material containing aluminum or titanium. The lattice bobbin constituting the latter voice coil assembly is made of any of paper-making materials, polyimide, polyetherimide, liquid crystal polymer resin materials, or metal materials containing aluminum or titanium. It is formed with. The voice coil assembly further includes a tinsel wire connected to an input end and an output end where a plurality of internal voice coils are connected to each other, so that an audio signal current can be conducted.

  Here, the internally wound rectangular coil is a coil in a bobbin-less state in which the wound coil has a rectangular appearance corresponding to the magnetic gap shape of the magnetic circuit and does not have a bobbin as a coil winding core. The voice coil is fixed to the inner wall surface that defines the rectangular space of the rectangular bobbin, or is fixed to the inner wall surface that defines the rectangular space of the lattice bobbin while being wound up. The outer dimension of the inner winding rectangular coil is substantially the same as the inner dimension of the rectangular space of the bobbin, and the inner winding rectangular coil and the rectangular space of the bobbin are fitted to each other and are closely fixed by an adhesive. . Further, in the voice coil assembly of the present invention, each of the inner winding voice coils of the two rectangular bobbins that are in close contact with each other, or two inner winding voice coils that are arranged with the inner wall surface interposed therebetween, is one inner winding. The one side of the rectangular coil and the other side of the other internally wound rectangular coil closest to the rectangular coil are connected so that the audio signal current is conducted in the same direction.

  The speaker of the present invention is realized using the voice coil assembly described above. That is, the speaker of the present invention is a speaker diaphragm fixed to the voice coil assembly, an edge that supports the outer periphery of the speaker diaphragm so as to vibrate, a frame to which the outer periphery of the edge and the magnetic circuit are connected, Is provided. The magnetic circuit includes a plurality of magnets each having a rectangular flat plate crowned and magnetized so that their magnetic polarities are different from each other, and a yoke fixed to the plurality of magnets. Therefore, the internally wound rectangular coil of the voice coil assembly is disposed in the magnetic gap formed between the adjacent plates and between the plate and the yoke. In other words, two internal voice coils sandwiching the inner wall surface of the bobbin are arranged in a magnetic gap formed between adjacent plates.

  As a result, it is possible to realize a flat and thin speaker in which a divided frequency is hardly generated and a flat frequency characteristic is obtained. In the voice coil assembly of the present invention, each of the internally wound rectangular coils is fixed to the inner wall surface that defines the rectangular space of the bobbin, so that adjacent bobbins constituting the voice coil assembly, that is, a plurality of internally wound voices The coil can be formed by tightly fixing it, and as a result, the rigidity of the bobbin can be increased, and malfunctions such as split vibrations of the bobbin or generation of abnormal noise due to contact between adjacent bobbins can be suppressed. . In addition, since the amount of adhesive for connecting adjacent bobbins can be reduced, the weight of the speaker vibration member is reduced, and the reproduction efficiency of the speaker is improved and stable sound reproduction can be obtained. In the case where the voice coil assembly is constituted by a grid-like bobbin, the bobbin rigidity can be similarly increased and the occurrence of divided vibrations of the bobbin can be suppressed.

  The speaker equipped with the voice coil assembly of the present invention can realize a flat and thin speaker that has high efficiency, hardly generates divided vibrations, and can obtain a flat frequency characteristic, and is less likely to cause malfunction. Stable sound reproduction can be obtained.

  The voice coil assembly of the present invention has a rectangular cross-sectional shape for the purpose of realizing a flat and thin speaker that has high efficiency, is less likely to generate divided vibrations, has a flat frequency characteristic, and is less likely to malfunction. One inner volume voice coil comprising a plurality of inner volume voice coils each having a rectangular bobbin formed in a shape and having a rectangular space inside, and an inner volume rectangular coil fixed to an inner wall surface defining the rectangular space of the rectangular bobbin. This is realized by ensuring that the outer wall surface of the rectangular bobbin of the coil and the outer wall surface of the rectangular bobbin of the other inner-wound voice coil are closely fixed.

  Hereinafter, a voice coil assembly according to preferred embodiments of the present invention and a speaker using the same will be described, but the present invention is not limited to these embodiments.

  FIG. 1 is a diagram illustrating a flat and thin speaker 1 according to a preferred embodiment of the present invention. FIG. 1A is a perspective view illustrating the speaker 1 with the flat diaphragm 6 facing upward, and FIG. 1B is a cross-sectional view taken along line AA ′ illustrating the internal structure of the flat thin speaker 1. FIG. Note that some internal structures that are not necessary for the description are omitted.

  The flat thin speaker 1 of this embodiment is a flat thin speaker including a speaker vibrating member 5 including a substantially rectangular flat diaphragm 6, and has a length L (about 140.8 mm) that forms the diaphragm area. Compared with the speaker, the width W (about 16.2 mm) of the flat diaphragm 6 and the overall height h (about 20.0 mm) as a speaker are suppressed to be small. Specifically, a speaker magnetic circuit 2, a holding frame 3 that is fixed to the bottom surface side of the magnetic circuit 2, and a resin (?) Frame 4 that supports the periphery of the flat diaphragm 6 are further provided. Yes. The speaker magnetic circuit 2 is a magnetic circuit including 14 main magnets 22 that are magnetized so that their magnetic polarities are different from each other and arranged in a row. The frame 4 has a frame fixing portion for fixing the flat and thin speaker 1 to a cabinet (not shown) or the like.

  The speaker vibrating member 5 includes a flat diaphragm 6, an edge 7 that supports the outer peripheral end of the flat diaphragm 6 so as to vibrate, and a voice coil assembly 10 that is fixed to the back side of the flat diaphragm 6 to be described later. Prepare. For example, the flat diaphragm 6 is a molded plate of foamed resin (material: PC (polycarbonate)), and its outer peripheral portion is supported by an edge 7 containing rubber (material: foamed rubber). Is fixed to the frame 4. The voice coil assembly 10 is fixed to the back side of the flat diaphragm 6, and a plurality of inner-wound rectangular coils 9 (14 in this embodiment) attached to the voice coil assembly 10 are connected to the voice signal current. Is supplied to the voice coil assembly 10 by the magnetic circuit 2, and as a result, when the flat diaphragm 6 vibrates, the flat thin speaker 1 reproduces sound.

  As shown in FIG. 1B, the magnetic circuit 2 includes a yoke 21 made of a magnetic metal, 14 main magnets 22, a rectangular plate 23 crowned on top of these magnets 22, and a rectangular plate. And repulsive magnets 24 respectively crowned on the upper part of 23. The yoke 21 has a planar plate portion 21 a and a side wall portion 21 b (not shown) that defines a magnetic gap between the rectangular plate 23. Specifically, the yoke 21 and the rectangular plate 23 are formed by pressing an iron plate.

  Fourteen main magnets 22 are arranged in a row on the plate portion 21a of the yoke 21 so that their magnetic polarities are different from each other. Each of the 14 main magnets 22 is magnetized by selecting two sets so that the rectangular plate 23 is fixed in advance and the rectangular plate 23 side has an N pole or an S pole. Then, the 14 magnetized main magnets 22 are aligned and fixed so that the magnetic poles are different from each other by using a jig on the plate portion 21a of the yoke 21. In the magnetic gaps formed in places where the magnetic polarities are different from each other, the magnetic flux flies from the N pole toward the S pole. Therefore, in each magnetic gap provided in the magnetic circuit 2, the direction according to the arrangement of the main magnets 22. Magnetic flux flies to In addition, the repulsive magnet 24 magnetized in advance is selected on the N or S pole so that the magnetic field lines due to the repulsive magnetic field fly from the side surface of the rectangular plate 23 and fixed to the upper surface side of the rectangular plate 23 with an adhesive. Is done. Therefore, the magnetic gap formed between the rectangular plates 23 adjacent to the magnetic circuit 2 and between the rectangular plate 23 and the side wall 21b of the yoke 21, that is, the magnetic gap provided in a lattice shape is high. Magnetic flux density distribution is obtained.

  FIG. 2 is a view for explaining the voice coil assembly 10 constituting the flat and thin speaker 1. FIG. 2A is a perspective view illustrating the internal winding voice coil 11 constituting the voice coil assembly 10, and FIG. 2B is an enlarged cross-sectional view of a part of the voice coil assembly 10. FIG. 2C is a perspective view showing the entire voice coil assembly 10. FIG. 3 is an enlarged cross-sectional view of a part of the voice coil assembly 10 fixed to the back side of the flat diaphragm 6 of the flat thin speaker 1. In FIG. 2, a part of the configuration is shown transparently for the sake of explanation.

  Each of the internally wound voice coils 11 constituting the voice coil assembly 10 includes a rectangular bobbin 12 having a rectangular cross section formed therein and a rectangular space 12a inside, and an inner wall surface 12b defining the rectangular space of the rectangular bobbin 12. An internally wound rectangular coil 9 secured to Specifically, the rectangular bobbin 12 is formed of a capton having a thickness t = 0.10 mm, and the inner dimension of the rectangle is about 8.5 mm × about 8.5 mm. Since the rectangular bobbin 12 is formed in a rectangular shape by the inner wall surface 12b, the rectangular bobbin 12 has a rectangular space 12a inside, and its outer wall surface 12c forms four planes. The rectangular bobbin 12 may be made of a paper material such as kraft paper or spiral paper other than resin materials such as capton, siller, and till, and may be formed of a metal material containing aluminum or titanium. .

  The inner-wound rectangular coil 9 is a coil in which a copper wire having a wire diameter of 0.12 mm is wound in a bobbinless state so that the outer dimension is a rectangular shape having an outer shape of about 9.1 mm × about 9.1 mm. The outer dimensions of the inner winding rectangular coil 9 substantially coincide with the inner dimensions of the rectangular space 12a of the rectangular bobbin 12. In manufacturing the inner-wound rectangular coil 9, after winding the wire around the temporary rectangular core, the adhesive or varnish is applied to the wire, and after it has hardened, the core is removed to remove the bobbin-less inner core. A wound rectangular coil 9 is formed. Therefore, the inner winding rectangular coil 9 of the inner winding voice coil 11 is fitted into the rectangular space 12a of the rectangular bobbin 12 and is then closely fixed to the inner wall surface 12b with an adhesive. Note that the rectangular bobbin 12 and the rectangular shape of the inner winding rectangular coil 9 include a case where the corners of the rectangle are curved so as to prevent the material from being bent. This curved surface should just be a curved surface prescribed | regulated by the radius of the magnitude | size which does not contact the rectangular plate 22 etc. which comprise the magnetic circuit 2.

  Next, the configuration of the voice coil assembly 10 will be described. Specifically, the voice coil assembly 10 of the present embodiment is formed as an assembly in which 14 internal voice coils 11 are fixed in a row, and in FIG. 2B and FIG. Only the four components are shown in an enlarged manner. If the outer wall surface 12c of the rectangular bobbin 12 of one inner-wound voice coil 11a and the outer wall surface 12c of the rectangular bobbin 12 of the other inner-wound voice coil 11b are closely fixed with an adhesive, the voice coil assembly 10 is configured. can do.

  In addition, in order to tightly fix the outer wall surfaces 12c of the rectangular bobbins 12 of the inner winding voice coil 11, in addition to the adhesive, a band member 13 that goes around the outer wall surfaces 12c of all the rectangular bobbins 12 is used in combination. May be fixed with an adhesive. The voice coil assembly 10 further includes tinsel wires 14 and 15 that are connected to the input end and the output end of the internal winding voice coil 11 connected to each other. In addition, in order to arrange the inner winding voice coils 11 in a row and adhere and fix them to each other, a jig for regulating the position of each inner winding voice coil 11 may be used.

  Further, in the voice coil assembly 10 of the present invention, the inner winding voice coil 9 of each of the two rectangular bobbins 12 that are in close contact with each other has one inner winding rectangular coil and the other inner winding that is closest to the inner winding. An audio signal current is connected to one side of the rectangular coil in the same direction. For example, in the voice coil assembly 10 shown in FIG. 2B, when a clockwise current Ia as shown in the figure flows through the inner winding rectangular coil 9a of the inner winding voice coil 11a of the inner winding voice coil 11a. The inner-wound rectangular coil 9a so that a counterclockwise current Ib as shown flows through the inner-wound rectangular coil 9b of the inner-wound voice coil 11b of the inner-wound voice coil 11b that is in close contact with the right side thereof. And 9b are connected. In other words, the inner winding rectangular coils 9a and 9b are configured such that the right side of the inner winding rectangular coil 9a located on the left side and the left side of the inner winding rectangular coil 9b located on the right side are in the same direction. It is connected so that the signal current is conducted.

  Here, since the voice coil assembly 10 is configured by closely fixing the outer wall surfaces 12c of the rectangular bobbins 12 with an adhesive, the inner wound rectangular coils 9a and 9b are formed by the two rectangular bobbins 12 that are in close contact with each other. The inner wall surface 12b and the outer wall surface 12c are opposed to each other and are connected so that the audio signal current is conducted in the same direction. Therefore, in the flat and thin speaker 1 using the voice coil assembly 10, as shown in FIG. 3, these internally wound rectangular coils 9 a and 9 b are two rectangular plates adjacent to the lattice-like magnetic gap of the magnetic circuit 2. 23, the two rectangular bobbins 12 are disposed so as to face each other with the inner wall surface 12b or the outer wall surface 12c interposed therebetween. Since the electromagnetic force acts on the inner winding rectangular coils 9a and 9b in either the upper surface direction or the lower surface direction, the voice coil assembly 10 in which other inner winding rectangular coils 9 arranged in the same manner are arranged in the magnetic gap is used. The driving force acts in the upper surface direction or the lower surface direction, and the planar diaphragm 6 can be displaced upward or downward. As a result, when the flat diaphragm 6 vibrates, the flat thin speaker 1 reproduces sound.

  In connecting the plurality of inner-wound rectangular coils 9 to each other, it does not matter whether they are connected in series or in parallel. In consideration of the impedance of each inner-wound rectangular coil 9 and the combined impedance of the whole, the connection may be made using both serial connection and parallel connection. Also, in order to make the rotation direction in which the audio signal current flows, the adjacent coils are in the reverse rotation direction, two types of coils in which the winding directions of the plurality of internally wound rectangular coils 9 are changed may be prepared. Alternatively, even if the winding directions of all the internally wound rectangular coils 9 are the same, the winding start side and the winding end side may be switched and connected to each other.

  In this voice coil assembly 10, each of the internally wound rectangular coils 9 is fixed to the inner wall surface 12 b that defines the rectangular space 12 a of the rectangular bobbin 12, so that the outside of the adjacent rectangular bobbin 12 that constitutes the voice coil assembly 10. The wall surfaces 12c can be bonded and fixed without leaving a gap. As a result, since the overall strength of the voice coil assembly 10 is improved, the plane vibration plate 6 and the speaker vibrating member 5 including the voice coil assembly 10 are flat surfaces in which a divided vibration is hardly generated and a flat frequency characteristic is obtained. A thin speaker 1 can be realized.

  Further, the voice coil assembly 10 can solve the problems found in the voice coil assembly in which a plurality of voice coils each having a coil wound around the outside of a conventional bobbin are adjacent to each other. That is, there is no malfunction such as generation of abnormal noise due to contact between adjacent rectangular bobbins 12, or the amount of adhesive for connecting adjacent rectangular bobbins 12 can be reduced. The weight is reduced and the reproduction efficiency of the speaker 1 is improved, thereby enabling stable audio reproduction.

  Further, the thin flat speaker 1 of the present embodiment is a case where each of the 14 main magnets 22 and the internally wound rectangular coil 9 is a common rectangular shape, but the number of magnets and coils may be two or more. Any rectangular shape may be used.

  FIG. 4 is a view for explaining a voice coil assembly 30 of another embodiment constituting the flat and thin speaker 1. 4A is a plan view of the voice coil assembly 30, and FIG. 4B is a perspective view showing the entire voice coil assembly 30. The voice coil assembly 30 has a lattice-shaped bobbin 31 having a cross-sectional shape formed in a lattice shape and having 14 rectangular spaces 31a therein, and 14 fixed to an inner wall surface 31b that defines the rectangular space 31a. An internally wound rectangular coil 9. Since the voice coil assembly 30 of this embodiment can constitute the flat thin speaker 1 in place of the voice coil assembly 10 of the previous embodiment, the common magnetic circuit 2 and the flat diaphragm 6 can be provided. The speaker vibration member 5 and the like including the same are denoted by common numbers, and description and illustration are omitted.

  The lattice bobbin 31 is formed of a resin material liquid crystal polymer by an injection mold and is formed in a lattice shape (ladder shape) having an average thickness of 0.2 mm, and 14 rectangular spaces 31a arranged in a row. Is stipulated. The inner wound rectangular coil 9 is fitted into the rectangular space 31a of the lattice bobbin 31, and is then tightly fixed to the inner wall surface 31b with an adhesive. In the case of the lattice bobbin 31 formed of resin as in the present embodiment, a step (not shown) is provided on the inner wall surface 31b that defines the rectangular space 31a. Also good.

  Also in the voice coil assembly 30 of the present embodiment, the plurality of internally wound rectangular coils 9 are connected in the same manner as the voice coil assembly 10 of the previous embodiment. That is, the two inner-wound rectangular coils 9a and 9b fixed to the inner wall surfaces 31b of the two adjacent rectangular spaces 31a have one side of the inner-wound rectangular coil 9a arranged with the inner wall surface 31b therebetween, The one side of the wound rectangular coil 9b is connected so that the audio signal current is conducted in the same direction. Accordingly, the 14 inner-wound rectangular coils 9 are connected to each other so that the directions of the driving forces acting on the voice coil assembly 30 coincide.

  Since the lattice bobbins 31 are structures integrally formed of a liquid crystal polymer resin excellent in rigidity and heat resistance, the rigidity can be further increased as compared with the case where the rectangular bobbins 12 are connected to each other in the previous embodiment. Therefore, the voice coil assembly 30 using the lattice-shaped bobbin 31 can suppress the split vibration of the voice coil assembly 30 and the speaker vibrating member 5 including the planar diaphragm 6. In addition, since the shape and size of the lattice bobbin 31 can be manufactured with high accuracy, the speaker 1 capable of stable sound reproduction is realized as a result.

  In addition to the liquid crystal polymer, the material constituting the lattice bobbin 31 may be a resin material such as polyimide or polyetherimide, and the molding method may be extrusion molding, and is not limited to the above injection molding. Absent. The lattice bobbin 31 may be a paper material formed by papermaking. Further, the lattice bobbins 31 may be obtained by impact molding of a metal material containing aluminum or titanium.

  In the flat and thin speaker 1 of the present embodiment, the case of the magnetic circuit 2 using the 14 main magnets 22 is illustrated, but the configuration of the magnetic circuit 2 is not limited to this. The number of magnets arranged in the magnetic circuit 2 may be less than or more than 14, and the arrangement is not limited to one line. It may be a matrix of 2 rows and 2 columns.

  The speaker vibration member and the manufacturing method thereof according to the present invention can be applied not only to a speaker having a planar diaphragm but also to a headphone diaphragm.

It is a figure explaining the flat thin speaker by preferable embodiment of this invention. Example 1 It is a figure explaining the voice coil assembly which comprises the flat thin speaker by preferable embodiment of this invention. Example 1 It is an enlarged view explaining the flat thin speaker by preferable embodiment of this invention. Example 1 It is a figure explaining the voice coil assembly which comprises the flat thin speaker by other preferable embodiment of this invention. (Example 2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Speaker 2 Magnetic circuit 21 Yoke 22 Main magnet 23 Rectangular plate 24 Repulsive magnet 3 Holding frame 4 Frame 5 Speaker vibration member 6 Planar diaphragm 7 Edge 9 Inner volume rectangular coil 10, 30 Voice coil assembly 11 Inner volume voice coil 12 Rectangular Bobbin 12a Rectangular space 12b Inner wall surface 12c Outer wall surface 13 Band members 14, 15 Kinshi wire 31 Lattice bobbin 31a Rectangular space 31b Inner wall surface

Claims (7)

A plurality of internally wound voice coils each including a rectangular bobbin having a rectangular cross section formed therein and a rectangular space inside, and an internally wound rectangular coil fixed to an inner wall surface defining the rectangular space of the rectangular bobbin. ,
The outer wall surface of the rectangular bobbin of one inner-wound voice coil and the outer wall surface of the rectangular bobbin of the other inner-wound voice coil are firmly fixed.
Voice coil assembly. One side of the one inner-wound rectangular coil in which the two inner-wound voice coils, in which the outer wall surfaces of the rectangular bobbin are closely fixed to each other, are disposed with the two rectangular bobbins in close contact with each other. And the other side of the inner wound rectangular coil are connected so that the audio signal current is conducted in the same direction.
The voice coil assembly according to claim 1. The rectangular bobbin is formed of any one of kraft paper, spiral paper, or a material of capton, sinter, til resin, or aluminum or titanium.
The voice coil assembly according to claim 1 or 2. A lattice-shaped bobbin having a cross-sectional shape formed in a lattice shape and having a plurality of rectangular spaces therein, and a plurality of internally wound rectangular coils respectively fixed to inner wall surfaces defining the rectangular space of the lattice-shaped bobbins,
Two inner-wound voice coils fixed to the inner wall surfaces of two adjacent rectangular spaces are arranged such that one side of the inner-wound rectangular coil is disposed across the inner wall surface and the other inner-wound rectangle. The one side of the coil is connected so that the audio signal current is conducted in the same direction.
Voice coil assembly. The lattice bobbin is formed of any one of a papermaking material, a polyimide, a polyetherimide, a liquid crystal polymer resin material, or a metal material containing aluminum or titanium.
The voice coil assembly according to claim 4. A tinsel wire connected to the input end and the output end connected to each other of the plurality of inner winding voice coils;
The voice coil assembly according to any one of claims 1 to 5. The voice coil assembly according to any one of claims 1 to 6, a speaker diaphragm fixed to the voice coil assembly, an edge that supports an outer peripheral end of the speaker diaphragm so as to vibrate, A speaker comprising an outer peripheral end and a frame to which a magnetic circuit is connected,
The magnetic circuit includes a plurality of magnets each having a rectangular flat plate and magnetized so that their magnetic polarities are different from each other, and a yoke fixed to the plurality of magnets. Prepared,
The inner winding rectangular coil of the voice coil assembly is arranged in a magnetic gap formed between the adjacent plates and between the plate and the yoke.
speaker.

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