JP2009260577A - Loudspeaker using voice coil assembly, and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a high-efficiency loudspeaker which can obtain a flat frequency characteristic with fewer divided vibrations and which is hard to generate operation defects, and a manufacturing method thereof. <P>SOLUTION: In a process of manufacturing the loudspeaker by arranging an internal-winding rectangle coil of a voice coil assembly at a magnetic space of a magnetic circuit, and exposing outer wall surfaces of both end portions of the voice coil assembly at an opening of the magnetic circuit, an assembly jig adequately arranging the voice coil assembly at the magnetic space of the magnetic circuit is brought into contact with the outer wall surfaces of the voice coil assembly to hold the voice coil assembly for manufacturing the loudspeaker. <P>COPYRIGHT: (C)2010,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). However, when assembling a speaker in which a coil is wound around the inner diameter side of the bobbin, an assembly jig such as a conventional voice coil holder inserted between the inner diameter side of the bobbin and a pole that defines a magnetic gap is Since the coil wound on the inner diameter side interferes, there is a problem that it cannot be used.

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. It is to realize a speaker that hardly occurs and a manufacturing method thereof.

  A speaker of the present invention includes an internal winding voice including 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 coils are provided, and 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, and fixed to the inner wall surfaces of two adjacent rectangular spaces The two inner-winding voice coils are arranged in the same direction on one side of the one inner-wound rectangular coil and the other side of the other inner-wrapping rectangular coil arranged with the two rectangular bobbins in close contact with each other. One end is connected and fixed to the voice coil assembly, which is connected so that the audio signal current is conducted, and the input end and the output end where the plurality of inner winding voice coils of the voice coil assembly are connected to each other. Nishiki A wire, a speaker diaphragm fixed to the voice coil assembly, an edge that supports the outer periphery of the speaker diaphragm so as to vibrate, and a rectangular flat plate, and their magnetic poles are adjacent to each other. A magnetic circuit having a plurality of magnets that are magnetized differently and a yoke that is fixed to the plurality of magnets and defines open holes at both ends thereof, and the other end of the tinsel wire is connected and fixed. And a frame connected to the magnetic circuit to fix the outer periphery of the terminal and the edge, wherein the magnetic circuit is formed between the adjacent plates and between the plate and the yoke. The inner winding rectangular coil of the voice coil assembly is disposed in the magnetic gap, and the outer wall surfaces of both ends of the voice coil assembly are exposed in the open holes of the magnetic circuit.

  Further, the speaker of the present invention has a lattice bobbin having a cross section formed in a lattice shape and having a plurality of rectangular spaces therein, and a plurality of inner windings fixed to an inner wall surface defining the rectangular space of the lattice bobbins. A rectangular coil, and two inner wound voice coils fixed to the inner wall surfaces of two adjacent rectangular spaces, one side of the inner wound rectangular coil disposed across the inner wall surface, and the other inner coil On one side of the wound rectangular coil, the voice coil assembly is connected so that the audio signal current is conducted in the same direction, and an input end where a plurality of inner winding voice coils of the voice coil assembly are connected to each other; The tinsel wire connected and fixed to the output end, the speaker diaphragm fixed to the voice coil assembly, the edge that supports the outer periphery of the speaker diaphragm so as to vibrate, and the rectangular flat plate A magnetic circuit having a plurality of magnets that are crowned and magnetized so that their magnetic polarities are different from each other, and a yoke that is fixed to the plurality of magnets and defines open holes at both ends thereof And a terminal that is connected and fixed to the other end of the tinsel wire, and a frame that is connected to the magnetic circuit and fixes the outer periphery of the terminal and the edge. And the inner winding rectangular coil of the voice coil assembly is disposed in the magnetic gap formed between the plate and the yoke, and the outer wall surfaces of both ends of the voice coil assembly are disposed in the opening holes of the magnetic circuit. Is exposed.

  In the speaker of the present invention, the frame has a frame hole communicating with the open hole of the magnetic circuit, and the outer wall surfaces at both ends of the voice coil assembly are exposed from the open hole and the frame hole of the magnetic circuit.

  More preferably, the speaker of the present invention further includes a dustproof member that closes the opening hole of the magnetic circuit and the frame hole of the frame.

  The speaker manufacturing method of the present invention is the above-described speaker manufacturing method, in which rectangular flat plates are crowned and magnetized so that their magnetic polarities are different from each other. A step of forming a magnetic circuit having a plurality of magnets and a yoke fixed to the plurality of magnets and defining open holes at both ends thereof, a step of connecting a frame for fixing the terminal to the magnetic circuit, and a magnetic circuit Inserting an assembly jig for holding the voice coil assembly in contact with the outer wall surface of the voice coil assembly, and disposing the voice coil assembly in the magnetic gap, A step of connecting and fixing one end of a tinsel wire to an input end and an output end of a plurality of inner winding voice coils of the assembly connected to each other, and a tinsel wire derived from the voice coil assembly Connecting and fixing the other end to the terminal, bonding the speaker diaphragm to the voice coil assembly, bonding an edge supporting the outer periphery of the speaker diaphragm so as to vibrate to the frame, bonding And removing the assembly jig after the agent is solidified to form a vibrated speaker vibration system.

  More preferably, in the speaker manufacturing method of the present invention, the assembly jig includes two linear holding portions inserted between the outer wall surface of the voice coil assembly and the yoke defining the magnetic gap of the magnetic circuit; In the process of forming a speaker vibration system, an end surface holding portion that contacts the outer wall surfaces exposed at both ends of the voice coil assembly, two linear holding portions, and a connecting portion that connects the end surface holding portions are formed. The method further includes the step of fitting the tool to solidify the adhesive.

  The speaker manufacturing method of the present invention further includes a step of adhering and fixing the opening of the magnetic circuit and the dustproof member that closes the frame hole of the frame.

  The operation of the present invention will be described below.

  The voice coil assembly of the speaker of 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 formed in close contact with each other, and a plurality of inner winding voice coils on a lattice bobbin having a lattice shape. There is a case where the inner-wound rectangular coil is closely fixed. 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 is crowned with a rectangular flat plate, and the magnets are arranged so that their magnetic poles are different from each other, and the magnets are fixed to the magnets and open to both ends. Since the yoke defining the hole is provided, 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. The speaker of the present invention may further include a dustproof member that closes the opening hole of the magnetic circuit and the frame hole of the frame.

  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.

  In addition, since the magnetic circuit has open holes defined by the yoke at both ends thereof, the outer wall surfaces of both ends of the voice coil assembly are exposed in these open holes. When the frame has a frame hole communicating with the open hole of the magnetic circuit, the outer wall surfaces at both ends of the voice coil assembly are exposed from the open hole and the frame hole of the magnetic circuit. That is, in the voice coil assembly of the speaker of the present invention, the inner winding rectangular coil is fixed to the inner wall surface defining the rectangular space of the bobbin, and the coil does not exist on the outer wall surface of the voice coil assembly. In the manufacturing process, a speaker is manufactured by holding an assembly jig for appropriately arranging the voice coil assembly in the magnetic gap of the magnetic circuit against the outer wall surface of the voice coil assembly and holding the voice coil assembly. As a result, it is possible to realize a speaker that is less prone to malfunction such as the voice coil assembly contacting the magnetic circuit and generating abnormal noise. When the assembly jig includes two linear holding parts, an end face holding part, and a connecting part that connects them, the assembly jig is fitted in the process of forming the speaker vibration system. The adhesive can be solidified as it is, and the assembly jig can be removed after the adhesive has solidified to form a vibrated speaker vibration system.

  The speaker using 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 speaker using the voice coil assembly of the present invention has the purpose of realizing a flat and thin speaker that has high efficiency, is less likely to cause divided vibration, has a flat frequency characteristic, and is less likely to cause malfunction. In the process of manufacturing the speaker, the inner coil of the voice coil assembly is disposed in the magnetic gap of the magnetic circuit, and the outer wall surfaces of both ends of the voice coil assembly are exposed in the open hole of the magnetic circuit. By making an assembly jig for properly arranging the voice coil assembly in the magnetic gap of the magnetic circuit abutting on the outer wall surface of the voice coil assembly, the voice coil assembly is held to manufacture the speaker. ,It was realized.

  Hereinafter, a speaker using a voice coil assembly according to preferred embodiments of the present invention and a manufacturing method thereof 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. 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 Ga 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 air gap Gb formed in a place where the magnetic polarities are different from each other, the magnetic flux flies from the north pole to the south pole. Therefore, in each magnetic air gap Ga and Gb provided in the magnetic circuit 2, the arrangement of the main magnets 22 is arranged. The magnetic flux flies in the direction according 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, magnetic gaps formed between the rectangular plates 23 adjacent to the magnetic circuit 2 (Gb) and between the rectangular plate 23 and the side wall 21b of the yoke 21 (Ga), that is, provided in a lattice shape. In the magnetic gap, a high magnetic flux density distribution can be 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 internally wound rectangular coil 9, after winding a wire around a temporary rectangular core, an adhesive or varnish is applied to the wire, and after this is cured, the core is removed and the bobbin-less inner core is removed. 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.

  FIG. 5 is a diagram illustrating a magnetic circuit 2 used in a speaker 1 according to another preferred embodiment of the present invention. FIG. 5A is a perspective view for explaining the magnetic circuit module 2 m constituting the magnetic circuit 2, and FIG. 5B is a perspective view for explaining the magnetic circuit 2. The magnetic circuit 2 illustrated in FIG. 5 is configured by connecting six magnetic circuit modules 2m. That is, in the magnetic circuit 2 of FIG. 5, the magnetization directions of the three magnetic circuit modules 2a and the magnetic circuit module 2a are reversed so that the magnetic poles of the magnets of the magnetic circuit modules are different from each other. The magnetic circuit modules 2b are connected so as to appear alternately in a line.

  Each magnetic circuit module 2m includes a substantially rectangular flat plate 23, a main magnet 22 fixed to the bottom surface of the plate 23, a yoke 21 fixed to the bottom surface of the main magnet 22, and a repulsive magnet fixed to the top surface of the plate 23. 24. The plate 23 and the yoke 21 are made of a magnetic material such as soft iron or permalloy. The main magnet 22 and the repulsive magnet 24 are made of a magnet material containing a rare earth such as neodymium. The plate 23, the main magnet 22, the yoke 21, and the repulsion magnet 24 are fixed with an adhesive. Further, the yoke 21 includes a side wall portion 21b that forms a substantially linear magnetic gap Ga between a plate portion 21a to which the main magnet 22 is connected and a substantially rectangular side of the plate 23. In some cases, magnetic gap Ga is formed on two substantially rectangular sides corresponding to two parallel side wall portions 21b. Since the main magnet 22 and the repulsive magnet 24 are arranged so that the surfaces of the magnets having the same magnetic polarity sandwich the plate 23, a repulsive magnetic field having a high magnetic flux density is formed in the magnetic gap Ga.

  Further, the yoke 21 of the magnetic circuit module 2 has a substantially concave cross-sectional shape, and both end surfaces showing the substantially concave shape are connected to the yokes of other magnetic circuit modules arranged adjacent to each other. The part 21c is formed, and an open hole of the magnetic circuit formed by being connected is defined. That is, the connecting portion 21c is a portion where the yoke 21 of the magnetic circuit module 2 is in close contact with the yoke 21 of the other magnetic circuit module 2, functions as a portion through which the magnetic lines of force of the magnetic circuit 2 pass, and is bonded. The magnetic circuit modules are mechanically connected to each other by being fixed with an agent.

  Further, the connecting portions 21c of the magnetic circuit module 2 are fixed to each other, so that the plates 23 of the magnetic circuit modules 2a and 2b communicate with the magnetic gap Ga and are substantially linearly orthogonal to the magnetic gap Ga. The magnetic gap Gb is formed. Since the magnetic circuit modules 2a and 2b have their magnetization directions reversed to each other, a magnetic field having a high magnetic flux density is also formed in the magnetic gap Gb defined therebetween. In FIG. 5, since six magnetic circuit modules 2 are connected in a line, the magnetic gap Ga of the magnetic circuit module 2a and the magnetic gap Ga of the magnetic circuit module 2b are arranged in a straight line. When the magnetic circuit 2 is viewed as a whole, a lattice-shaped (or ladder-shaped) magnetic air gap composed of the magnetic air gap Ga and the magnetic air gap Gb is formed. Further, since the yoke 21 has a substantially concave cross-sectional shape, the magnetic circuit 2 connecting these yokes defines open holes 2x at both ends thereof.

  FIG. 6 is a diagram for explaining a method of manufacturing the speaker magnetic circuit 2 of this embodiment. FIG. 6A is a perspective view illustrating a manufacturing process of the magnetic circuit module 2m, and FIG. 6B is a perspective view illustrating a manufacturing process of the magnetic circuit 2. FIG. Each of the plurality of magnetic circuit modules 2m is manufactured using an assembly jig Ja that defines a magnetic gap Ga, and the magnetic circuit 2 composed of these magnetic circuit modules 2m uses an assembly jig Jb. Manufactured.

  As shown in FIG. 6A, the assembly jig Ja is fitted between the plate 23 and the side wall 21b of the yoke 21 to define the magnetic gap Ga. The assembly jig Ja is a cylindrical body having a substantially rectangular cross-sectional shape that covers the periphery of the plate 23, and includes a space for accommodating the plate 23 and the main magnet 22 therein. Further, since the assembly jig Ja has a protrusion that engages with the connecting portion 21c of the yoke 21, the assembly jig Ja is applied after applying an adhesive to the plate 23 and the non-magnetized main magnet 22. Is inserted into the yoke 21, the relative positional relationship between the yoke 21 and the plate 23 that defines the magnetic gap Ga and the magnetic gap Gb is uniquely fixed. Therefore, when the assembly jig Ja is removed after the adhesive is fixed, the magnetic circuit module 2m having the magnetic gap Ga and not magnetized is formed.

  Next, the magnetic circuit module 2m that is not magnetized is magnetized to form a magnetic circuit module 2a that exhibits one magnetic polarity and a magnetic circuit module 2b that exhibits the other magnetic polarity on the plate 23 side. To do. As described above, the magnetic circuit modules 2a and 2b are merely reversed in the magnetization direction in the magnetization process, and can be easily distinguished by applying some marking. Thereafter, a repulsion magnet 24 magnetized in advance is fixed to the top surface of the plate 23 of each of the magnetic circuit modules 2a and 2b. As described above, the repulsion magnets 24 are fixed after their orientations are confirmed so as to form a repulsion magnetic field.

  As shown in FIG. 6B, the magnetic circuit 2 is manufactured by connecting the magnetic circuit modules 2a and 2b using an assembly jig Jb. The assembly jig Jb is a lattice-shaped jig having such a dimension that the connecting portions 21c of the yokes 21 of the six magnetic circuit modules 2a and 2b inserted into close contact with each other. The grid-like wall portions that separate from each other define the magnetic gap Gb formed by the plates 23. When the magnetic circuit modules 2a and 2b that have been previously magnetized in different directions and have different magnetic polarities are inserted into the assembly jig Jb so that different magnetic polarities appear alternately, an adhesive is applied to the connecting portion 21c. If the connecting parts 21c of the yokes 21 having different magnetic polarities are fixed to each other and the assembly jig Jb is removed after the adhesive is fixed, the magnetic circuit 2 is formed.

  Note that the magnetic circuit 2 shown in FIG. 6B further includes holding frames 3 that fit into the respective yokes 21. The holding frame 3 is a member having a substantially concave cross section formed so as to cover all the magnetic circuit modules 2 from the back side of the magnetic circuit 2, and is fixed to the yoke 21 with an adhesive. The holding frame 3 may be a magnetic material such as iron as illustrated, or a nonmagnetic material such as aluminum or resin. Since the holding frame 3 is fitted to all of the yokes 21, the magnetic circuit modules 2a and 2b are firmly connected by reinforcing the adhesion and fixing of the connecting portions 21c, so that the magnetic circuit for speaker is less likely to cause malfunction. 2 can be realized. The assembly jig Jb may be removed before the holding frame 3 is fixed, but preferably after the holding frame 3 is fixed as shown in FIG. 6B. The holding frame 3 may be formed integrally with the above-described frame 4 and has a substantially concave cross section, and therefore has a frame hole 3 x communicating with the opening hole 2 x of the magnetic circuit 2.

  The speaker magnetic circuit 2 of the present invention composed of a plurality of magnetic circuit modules 2 can form a repulsive magnetic field showing a high magnetic flux density in both the magnetic gap Ga and the magnetic gap Gb. In the conventional magnetic circuit, the connecting portions 21c of the yoke 21 are closely bonded and fixed by using the assembly jig Jb, compared to the case where a yoke composed of one non-divided member is provided. As long as it is present, the magnetic flux density is not significantly reduced by the magnetic gaps Ga and Gb.

  On the other hand, the process of preparing magnetic circuit modules 2a and 2b with different magnetization directions in advance is basically the same as the process of magnetizing a magnetic circuit used for a normal speaker. There is an advantage that it can be used as it is. That is, even if it is the magnetic circuit 2 for speakers provided with a some magnet, the working efficiency in manufacture is good and manufacturing cost can be suppressed. Also, by preparing the magnetic circuit modules 2a and 2b as repulsive magnetic circuits, it is not necessary to handle only a small magnetized main magnet when assembling the magnetic circuit 2 for speakers. improves.

  For example, when a larger magnetic circuit is required, the number of magnetic circuit modules 2m constituting the magnetic circuit is further increased to 8, 10, and 14, depending on the number of magnetic circuit modules. It is sufficient to prepare an assembly jig Jb, and it is possible to meet various design change requests. Therefore, the speaker magnetic circuit 2 with high magnetic efficiency can be easily configured.

  7 and 8 are diagrams for explaining a process for manufacturing the speaker 1 of this embodiment. Specifically, FIG. 7A is a perspective view for explaining an assembly jig Jx for manufacturing a speaker by holding a voice coil assembly, and FIG. 7B is an assembly process in the assembly process. It is an expansion perspective view explaining the speaker 1 in the state where the tool Jx is inserted, and a part of the illustration of the speaker vibrating member 5 including the flat diaphragm 6 is omitted. FIG. 8A is an enlarged perspective view for explaining the speaker 1 with the assembly jig Jx inserted, and FIG. 8B shows the speaker 1 with the assembly jig Jx removed. It is an expansion perspective view to explain. 7B and 8, only one end side of the elongated speaker 1 is shown in an enlarged manner.

  As shown in FIG. 7 (a), the assembly jig Jx is a speaker vibration made of a resin such as POM (polyacetal) or PTFE (polytetrafluoroethylene), or a non-magnetic metal such as brass. This is an assembly jig for holding the both ends of the voice coil assembly 40 by inserting them from the open holes 2x provided at both ends of the magnetic circuit 2 in the process of manufacturing the speaker 1. The assembly jig Jx includes two linear holding portions Jx1 inserted between the outer wall surface 42 of the voice coil assembly 40 and the side wall portion 21b of the yoke 21 that defines the magnetic gap Ga of the magnetic circuit 2, and the voice coil. An end surface holding portion Jx2 that abuts on the outer wall surface 42 exposed at both ends of the assembly 40, and a connecting portion Jx3 that connects the two linear holding portions Jx1 and the end surface holding portion Jx2. The cross-sectional shapes of the two linear holding portions Jx1 are such that the portion inserted between the outer wall surface 42 of the voice coil assembly 40 and the side wall portion 21b of the yoke 21 is narrow, and the voice coil assembly 40. And a step where the stepped portion places the inner wound rectangular coil 9 of the voice coil assembly 40 in the magnetic gaps Ga and Gb. Part Jx4 is defined. Further, a flange portion Jx5 that contacts the open hole 2x of the magnetic circuit 2 is formed at the peripheral edge portion of the end surface holding portion Jx2, and the end surface holding portion Jx2 of the assembly jig Jx is located at both ends of the voice coil assembly 40. The position in contact with the outer wall surface 42 is restricted.

  As shown in FIG. 7B and FIG. 8A, the assembly jig Jx is inserted from the frame hole 3x of the holding frame 3 communicating with the open hole 2x of the magnetic circuit 2, and the linear holding portion is inserted. Jx1 and the end surface holding portion Jx2 are in contact with the outer wall surfaces 42 at both ends of the voice coil assembly 40. That is, by restricting the four corners of the voice coil assembly 40 having the elongated and substantially rectangular grid-like bobbins 41 with the assembly jigs Jx inserted from the open holes 2x at both ends of the magnetic circuit 2, the voice coil assembly 40 The internally wound rectangular coil 9 can be disposed in the magnetic gaps Ga and Gb. Therefore, in the speaker 1, when the assembly jig Jx is removed, the outer wall surfaces at both ends of the voice coil assembly 40 are exposed through the opening hole 2x and the frame hole 3x. When the outer wall surfaces at both ends of the voice coil assembly 40 are exposed, the outer wall surfaces at both ends of the voice coil assembly 40 can be seen through the open hole 2x and the frame hole 3x. It becomes possible to contact. The voice coil assembly 40 in the speaker 1 of the present embodiment is the same as the voice coil assembly in the previous embodiment except that the total number of the inner-wound rectangular coils 9 and the specific shape of the lattice bobbins 41 are different. It is a voice coil assembly equivalent to the solid 30.

  As shown in FIGS. 8A and 8B, in the step of forming the speaker vibration system including the speaker vibration member 5, the adhesive can be solidified while the assembly jig Jx is fitted. . The speaker vibrating member 5 includes a planar diaphragm 6, an edge 7 that supports the outer peripheral end of the planar diaphragm 6 so as to vibrate, and a voice coil assembly 40 that is fixed to the back side of the planar diaphragm 6 to be described later. Each of which is secured with an adhesive. Since one end of the tinsel wire (not shown) is connected and fixed to the input end and the output end of the voice coil assembly 40 where the plurality of inner winding voice coils 9 are connected to each other, the other end of the tinsel wire is The speaker diaphragm 6 is bonded to the voice coil assembly 40 and the edge 7 that supports the outer peripheral end of the speaker diaphragm 6 so as to vibrate is bonded to the frame 4. Therefore, the assembly jig Jx can be removed after the adhesive is solidified to form a speaker vibration system that can vibrate. A manufacturing process capable of reducing the number of steps and stabilizing the quality is realized, and in the speaker 1 of the present embodiment, the voice coil assembly 40 having the lattice bobbins 41 contacts the magnetic circuit 2 to generate noise. It is possible to suppress malfunctions such as.

  Further, in the speaker 1 of the present embodiment, after the assembly jig Jx is removed, an open hole 2x communicating with the magnetic gaps Ga and Gb and a dustproof member 50 that closes the frame hole 3x are further provided. You may make it prevent that foreign materials, such as iron powder, penetrate | invade inside. The dustproof member 50 may be formed of a woven or non-woven fabric having air permeability, and the periphery is adhered and fixed to the holding frame 3 so as to cover the open hole 2x and the frame hole 3x. The dustproof member 50 may be a material having air permeability such as a punching net, and suppresses an increase in compliance due to air inside the magnetic circuit 2 even if the opening hole 2x and the frame hole 3x are covered. Is preferred.

  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) It is a figure explaining the magnetic circuit of the speaker by other preferable embodiment of this invention. (Example 3) It is a figure explaining the manufacturing method of the magnetic circuit for speakers of a present Example. (Example 3) It is a figure explaining the process of manufacturing the speaker 1 of a present Example. (Example 3) It is a figure explaining the process of manufacturing the speaker 1 of a present Example. (Example 3)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Speaker 2 Magnetic circuit 2m, 2a, 2b Magnetic circuit module 21 Yoke 22 Main magnet 23 Rectangular plate 24 Repulsive magnet 3 Holding frame 4 Frame 5 Speaker vibration member 6 Plane diaphragm 7 Edge 9 Inner volume rectangular coil 10, 30, 40 Voice Coil assembly 11 Inner winding voice coil 12 Rectangular bobbin 12a Rectangular space 12b Inner wall surface 12c Outer wall surface 13 Band members 14, 15 Kinshi wire 31, 41 Lattice bobbin 31a Rectangular space 31b Inner wall surface 42 Outer wall surfaces 50 at both ends Dustproof member Ga , Gb Magnetic gap Ja, Jb, Jx Assembly jig

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 closely fixed to each other, and are attached to the inner wall surfaces of two adjacent rectangular spaces. The two inner-winding voice coils to be fixed are arranged so as to sandwich the two rectangular bobbins in close contact with each other, and one side of the other inner-winding rectangular coil, A voice coil assembly connected so that the audio signal current is conducted in the same direction;
A tinsel wire having one end connected to and fixed to an input end and an output end of the voice coil assembly connected to the plurality of inner winding voice coils;
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 plurality of magnets that are each crowned with a rectangular flat plate and are magnetized so that their magnetic polarities are different from each other, and are fixed to the magnets, and open holes are defined at both ends. A magnetic circuit having a yoke,
A terminal to which the other end of the tinsel wire is connected and fixed;
A frame connected to the magnetic circuit and fixing the outer periphery of the terminal and the edge;
A speaker comprising
The internal rectangular coil of the voice coil assembly is disposed in a magnetic gap formed between the adjacent plates and between the plates and the yoke, and the magnetic circuit The outer wall surfaces of both ends of the voice coil assembly are exposed in the open hole of the circuit.
speaker. 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. A voice coil assembly connected so that the audio signal current is conducted in the same direction on one side of the coil; and
A tinsel wire that is connected to and fixed to an input end and an output end of the voice coil assembly that are connected to each other,
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 plurality of magnets that are each crowned with a rectangular flat plate and are magnetized so that their magnetic polarities are different from each other, and fixed to the magnets, and open holes are defined at both ends thereof A magnetic circuit having a yoke,
A terminal to which the other end of the tinsel wire is connected and fixed;
A frame connected to the magnetic circuit and fixing the outer periphery of the terminal and the edge;
A speaker comprising
The inner winding rectangular coil of the voice coil assembly is disposed in a magnetic air gap formed between the adjacent plates and between the plates and the yoke, and the magnetic circuit The outer wall surfaces of both ends of the voice coil assembly are exposed in the open hole of the circuit.
speaker. The frame has a frame hole communicating with the open hole of the magnetic circuit;
The speaker according to claim 1 or 2, wherein outer wall surfaces of both ends of the voice coil assembly are exposed from the open hole and the frame hole of the magnetic circuit. A dustproof member for closing the opening hole of the magnetic circuit and the frame hole of the frame;
The speaker according to any one of claims 1 to 3. It is a manufacturing method of the speaker in any one of Claim 1 to 4,
A plurality of magnets that are each crowned with a rectangular flat plate and are magnetized so that their magnetic polarities are different from each other, and fixed to the magnets, and open holes are defined at both ends thereof Forming a magnetic circuit having a yoke,
Connecting the frame for fixing the terminal to the magnetic circuit;
An assembly jig for holding the voice coil assembly in contact with the outer wall surface of the voice coil assembly is inserted into the open holes at both ends of the magnetic circuit, and the voice coil assembly is inserted into the magnetic gap. A process of arranging in
Connecting and fixing one end of the tinsel wire to the input end and the output end of the voice coil assembly that are connected to each other;
Connecting and fixing the other end of the tinsel wire led out from the voice coil assembly to the terminal;
Bonding the speaker diaphragm to the voice coil assembly;
Adhering an edge supporting the outer peripheral end of the speaker diaphragm so as to vibrate to the frame;
Removing the assembly jig after the adhesive is solidified to form a vibrating speaker vibration system; and
A method for manufacturing a speaker, comprising: The assembly jig includes two linear holders inserted between an outer wall surface of the voice coil assembly and the yoke defining the magnetic gap of the magnetic circuit, and both ends of the voice coil assembly. An end surface holding portion that abuts the exposed outer wall surface, and a connecting portion that connects the two linear holding portions and the end surface holding portion,
The step of forming the speaker vibration system further includes the step of fitting the assembly jig and solidifying the adhesive.
The manufacturing method of the speaker of Claim 5. The method further includes the step of adhering and fixing the opening hole of the magnetic circuit and the dustproof member that closes the frame hole of the frame.
The speaker manufacturing method according to claim 5 or 6.