JP2015088825A - Voice coil, electrodynamic speaker, method of manufacturing voice coil, and method of manufacturing electrodynamic speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the effect of a tinsel wire connected to a coil in a voice coil used for an electrodynamic type speaker.SOLUTION: A voice coil 50 includes: a bobbin 52 formed in a slender annular shape having a long axis A-A' and a short axis B-B' as symmetric axes; a coil 54 which is wound around along the slender annular shape of the bobbin 52 and in which a winding start terminal 56 and a winding end terminal 58 are pulled out to positions of two symmetric intersection points where the long axis A-A' crosses the slender annular shape; and tinsel wires 70, 72 which are pulled out by being extended to both sides of the long axis A-A' from connection points 60, 62 by using symmetric points as the connection points 60, 62 in the respective winding start terminal 56 and winding end terminal 58 of the coil 54.

Description

  The present invention relates to a voice coil, an electrodynamic speaker, a method of manufacturing a voice coil, and a method of manufacturing an electrodynamic speaker, and in particular, a voice coil that uses a tinsel wire to draw a leader line, and an electrodynamic speaker using the same, The present invention relates to a manufacturing method thereof.

  In an electrodynamic speaker using a voice coil, the voice coil moves in the magnetic gap of the magnetic circuit, and therefore it is necessary to perform a balanced movement between the magnetic gaps. In other words, the voice coil of the electrodynamic loudspeaker preferably vibrates so as not to cause rolling, and vibrates in a well-balanced manner so as not to cause a defect that causes abnormal noise by contacting the magnetic circuit between the magnetic gaps. There is a need to.

  Patent Document 1 describes a voice coil for a speaker in which a first coil and a second coil are wound around the same bobbin and a tinsel wire is connected. Here, two leader lines out of four leader lines composed of the start and end of winding of the first coil and the start and end of winding of the second coil are symmetrical with respect to the other two leader lines. It is provided at the position so that the weight load biased to the bobbin is not applied.

  Patent Document 2 describes a configuration including an electrodynamic speaker including a diaphragm, a voice coil connected to the diaphragm, and a magnetic circuit having a magnetic gap into which the voice coil is inserted. Here, the voice coil is formed into a track type by winding the coil around a cylindrical bobbin, and the two tinsel wires connected to both ends of the coil are provided on the two side surfaces of the track type on the long side. Are drawn symmetrically along the track-shaped arc shape from the two connection points.

  In Patent Document 3, for an electrodynamic speaker using a voice coil, one end of each of two tinsel wires respectively connected to both ends of a voice coil wound around a bobbin and formed into a substantially track shape is It is described that it is connected to the coil and fixed to the bobbin at the lower end side of the substantially track-shaped arc portion.

Japanese Utility Model Publication No. 63-142997 JP 2013-145994 A JP 2009-260672 A

  In a voice coil that uses lead wire from an annular coil to draw out a lead wire, the movement in the magnetic gap is affected by the mass of the solder at the connection point of the lead wire, the pulling direction of the lead wire, etc. The shape may become unbalanced. When the movement of the voice coil in the magnetic gap becomes unbalanced, the vibration of the vibration system including the diaphragm driven by the voice coil becomes unbalanced, and rolling may occur. As a result, the sound quality as a speaker is deteriorated, and in some cases, the voice coil comes into contact with the magnetic circuit to generate abnormal noise, resulting in malfunction.

  The objective of this invention is providing the voice coil which can suppress the influence of the tinsel wire connected to a coil, and its manufacturing method. Another object is to provide an electrodynamic speaker that can suppress the influence of the tinsel wire on the vibration of a diaphragm driven by a voice coil, and a method of manufacturing the same.

  The voice coil according to the present invention has a bobbin formed in an elongated annular shape having a longitudinal axis and a short axis as symmetry axes, and is wound along the elongated annular shape of the bobbin so that the symmetry axis is an elongated annular shape. In each of the coil where the winding start terminal and the winding end terminal are drawn out at the position of two intersecting intersections, and the winding start terminal and the winding end terminal of the coil, extending from the connection point to both sides of the symmetry axis with the symmetry intersection as the connection point. And a tinsel wire drawn out.

  Further, in the voice coil according to the present invention, the tinsel wire is extended and bent from the connection point to both sides of the symmetry axis to form a predetermined flexible shape symmetrical to the symmetry axis, and both ends thereof are mechanically In addition, it is preferable that they are electrically connected and fixed and integrated.

  In the voice coil according to the present invention, the predetermined flexible shape is preferably formed in a plane parallel to a reference plane defined by the long axis and the short axis.

  In the voice coil according to the present invention, the two symmetrical intersections are preferably two points whose longitudinal axes intersect with the elongated annular shape.

  An electrodynamic speaker according to the present invention includes a voice coil according to any one of the above, a magnetic circuit having a magnetic gap corresponding to an elongated annular shape in which the coil of the voice coil is disposed so as to be able to vibrate, a magnetic circuit, and an edge And a diaphragm having an outer peripheral end connected to an edge and an inner peripheral end connected to a bobbin of a voice coil. It has a terminal including a terminal plate to which both ends of the tinsel wire are connected and fixed at the intersecting position.

  The method for manufacturing a voice coil according to the present invention includes a winding start terminal and a winding end terminal of a coil wound around a bobbin formed in an elongated annular shape having a longitudinal axis and a short axis as symmetry axes. In the coil forming process of drawing out the winding start terminal and the winding end terminal at the positions of two symmetrical intersections intersecting the elongated annular shape, and in each of the coil winding start terminal and winding end terminal, the symmetrical intersection point is used as a connection point to be symmetrical from the connection point. A process for connecting and fixing a tinsel wire so as to extend on both sides of the shaft, and a jig setting process for setting a bobbin on which a tinsel line extending on both sides around the connection point is connected and fixed to a predetermined jig And after temporarily hooking each of the both-side extended portions of the tinsel wire to the left and right positioning portions provided on the predetermined jig, the temporary fixing that is spaced apart from the center position of the left and right positioning portions in the direction opposite to the bobbin A flexible shape forming step of forming a tinsel wire in a predetermined flexible shape symmetric with respect to the symmetry axis between the connection point and the temporary fixing portion through the distal end side of the both sides extending portion, and the temporary fixing portion. And an external connection step of mechanically and electrically connecting and fixing the two ends of the tinsel wire so that the bobbin formed with the flexible shape of the tinsel wire is removed from a predetermined jig.

  The method for manufacturing an electrodynamic speaker according to the present invention includes a symmetrical arrangement of a winding start terminal and a winding end terminal of a coil wound around a bobbin formed in an elongated annular shape having a longitudinal axis and a short axis as symmetry axes. The coil forming process of the voice coil that pulls out the winding start terminal and the winding end terminal at the position of two symmetrical intersections where the shaft intersects the elongated annular shape, and the symmetrical intersection point at each of the coil winding start terminal and winding end terminal Set the bronze wire connecting process to connect and fix the tinsel wire so that it extends from the connection point to both sides of the symmetry axis, and the bobbin with the tink wire extending to both sides around the connection point to the predetermined jig The jig setting process and the left and right positioning parts provided on the predetermined jig are hooked on both sides of the extended portion of the tinsel wire, and then separated from the center position of the left and right positioning parts in the direction opposite to the bobbin. A flexible shape forming step of forming a tinsel wire in a predetermined flexible shape symmetric with respect to the symmetry axis between the connection point and the temporary fixing portion, through the tip side of the both-side extension portion to the temporary fixing portion disposed in a position; A terminal forming step for forming a terminal including a terminal plate to which both ends of the tinsel wire are connected and fixed at a position where the extended symmetry axis of the voice coil crosses the frame corresponding to the elongated annular shape, and the frame as an assembly jig The frame jig setting process to be set and the both ends of the tinsel wire gathered together by the temporary fixing part are mechanically and electrically connected and fixed to the terminal board of the frame terminal and integrated to make it possible to And an external connection step of detaching the frame from the predetermined jig and the voice coil formed with the flexible shape.

  In the voice coil according to the present invention, two symmetrical intersection points where the axis of symmetry of the elongated annular shape of the bobbin intersects the elongated annular shape are the connection points of the coil and the tinsel wire, and the tinsel wire extends from the connection point to both sides of the symmetry axis. Then pulled out. Accordingly, the mass of solder or the like at the connection point of the tinsel wire is symmetric with respect to the symmetry axis, and the direction in which the tinsel wire is drawn is also symmetric with respect to the symmetry axis. Thereby, in the voice coil, the imbalance due to the influence of the tinsel wire connected to the coil can be suppressed.

  Further, in the voice coil according to the present invention, the tinsel wire is extended and bent from the connection point to both sides of the symmetric axis to form a symmetric flexible shape with respect to the symmetric axis, and both ends thereof are mechanically and electrically connected. Are integrally connected and fixed. Thus, by forming a symmetrical flexible shape with respect to the symmetry axis, the unbalance property due to the influence of the tinsel wire connected to the coil is further suppressed.

  In the voice coil according to the present invention, the flexible shape of the tinsel wire is formed in a plane parallel to the reference plane defined by the long and short axes of the elongated annular shape, and is therefore perpendicular to the reference plane. The imbalance due to the influence of the tinsel wire connected to the coil is further suppressed with respect to the movement of the voice coil.

Further, in the voice coil according to the present invention, the two symmetrical intersections are two points whose longitudinal axis intersects the elongated annular shape, and therefore, for example, the resonance along the short axis generated based on the elongated annular shape is suppressed. In addition, rolling that occurs based on the elongated annular shape can be suppressed. Depending on the resonance phenomenon and the direction of rolling, the two symmetrical intersections may be two points where the short axis intersects the elongated annular shape.

  In the electrodynamic speaker according to the present invention, as a voice coil, two symmetrical intersections where the axis of symmetry of the elongated annular shape of the bobbin intersects with the elongated annular shape are the connection points of the coil and the tinsel wire, What has at least the structure extended | stretched and drawn out to the both sides of a symmetry axis is used. And the terminal corresponding to the elongated annular shape is provided with a terminal including a terminal plate to which both ends of the tinsel wire are connected and fixed at positions where the extended symmetrical axes intersect each other. Thereby, the unbalance property by the influence of the tinsel wire with respect to the vibration of the diaphragm driven by the voice coil can be suppressed.

  In the method of manufacturing a voice coil according to the present invention, two symmetrical intersections where the symmetry axis of the elongated annular shape of the bobbin intersects with the elongated annular shape are the connection points of the coil and the tinsel wire, and the tinsel wire is on both sides of the symmetry axis from this connection point. And drawn out. Then, using a predetermined jig having a temporary fixing portion that is arranged away from the center position of the left and right positioning portions and the left and right positioning portions in the direction opposite to the bobbin, with respect to the symmetry axis between the connection point and the temporary fixing portion. The tinsel wire is formed in a symmetrical flexible shape, and the both ends of the tinsel wire gathered by the temporary fixing portions are mechanically and electrically connected and fixed to be integrated. Thereby, the voice coil which suppressed the imbalance property by the influence of the tinsel wire connected to a coil can be obtained.

  In the method of manufacturing an electrodynamic speaker according to the present invention, two symmetrical intersections where the axis of symmetry of the elongated annular shape of the bobbin in the voice coil intersects with the elongated annular shape are the connection points of the coil and the tinsel wire, and the tinsel wire is the connection point. Are drawn to both sides of the symmetric axis and drawn out, and using a predetermined jig, the drawn kinned wire is formed into a flexible shape symmetrical to the symmetric axis. Then, the both ends of the tinsel wire gathered together by a predetermined jig are mechanically and electrically connected and fixed to the terminal plate of the terminal of the frame to be integrated. Thereby, the electrodynamic speaker which suppressed the imbalance property by the influence of the tinsel wire with respect to the vibration of the diaphragm driven by the voice coil can be obtained.

1 is a perspective view of an electrodynamic speaker according to an embodiment of the present invention. It is an expanded view of the electrodynamic type speaker of FIG. It is a figure which shows the voice coil of FIG.2 (c). It is a figure which shows the OA cross section of FIG. It is a figure which shows the manufacturing procedure of the voice coil in embodiment which concerns on this invention. It is a figure which shows the jig for the tinsel wire shaping used with the manufacturing method of the voice coil in embodiment which concerns on this invention. In FIG. 5, it is a figure which shows the process of shaping the tinsel line of a voice coil using the jig | tool of FIG. It is a figure which shows the effect of the electrodynamic speaker of embodiment which concerns on this invention. It is a figure which shows the voice coil of another form.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. The dimensions, shapes, materials, and the like described below are examples for explanation, and can be appropriately changed according to the specifications of the voice coil and the electrodynamic speaker. Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a perspective view showing an electrodynamic speaker 10. FIG. 2 is a development view of the electrodynamic speaker 10. The electrodynamic speaker 10 is an elongated speaker having a planar diaphragm 12 whose shorter direction is shorter than the longer direction. As the elongated shape, the planar shape includes a track shape, a rectangular shape, and an elliptical shape. The track-type shape is a shape including two parallel straight portions and arc portions connecting the two straight portions. The rectangular shape is a shape including two parallel long side portions and two short side portions parallel to a direction orthogonal thereto. The elliptical shape is an elliptical shape defined by geometry and does not have a straight line portion. Hereinafter, as shown in FIG. 1, a description will be given of a case where the planar shape of the diaphragm 12 is a track shape. In the following, a solid shape without a central portion is referred to as a track shape, and a solid shape is referred to as an elongated annular shape.

  As shown in FIGS. 1 and 2, the electrodynamic speaker 10 includes a diaphragm 12, a portion of an edge 14 connected to the diaphragm 12, a damper 30, a boil coil 50 with a tinsel wire, a frame 16, and a magnetic The circuit 20 is configured. Hereinafter, the boil coil 50 with a tinsel wire is simply referred to as a voice coil 50 unless otherwise specified. Since the diaphragm 12 has a track shape, the edge 14, the bobbin 52 of the voice coil 50, and the magnetic gap 28 of the frame 16 have an elongated annular shape corresponding to the track shape, although the dimensions are different. FIG. 1 shows a longitudinal axis A-A ′, a short axis BB, and a central axis O-O ′ as symmetry axes orthogonal to each other. The electrodynamic speaker 10 is not necessarily arranged with the plane defined by the long axis and the short axis as a horizontal plane. However, for the sake of convenience of explanation, in the following, the O side is the upper side along the OO ′ axis. And the O ′ side is called the bottom side.

  Since the voice coil 50 will be described in detail below with reference to FIG. 4, other elements will be described first.

  FIG. 2A shows a state in which the diaphragm 12 and the edge 14 are integrated. The diaphragm 12 is a resin thin plate provided with appropriate ribs in a track shape, and the outer peripheral side of the bottom surface is connected to the upper end portion of the bobbin 52 of the voice coil 50. The bottom surface in the thickness direction is a surface on the O ′ side of the O-O ′ axis in the diaphragm 12. By supplying an electrical signal corresponding to the sound to the voice coil 50, the diaphragm 12 is driven to move in the O-O 'axis direction by the bobbin 52, thereby vibrating and emitting sound waves to the outside.

  The plate thickness of the diaphragm 12 is set according to the dimensions of the track shape. For example, the major axis of the track shape can be about 30 mm to about 60 mm, the minor axis can be about 15 mm to about 30 mm, and the thickness can be about 0.1 mm to about 0.4 mm. Such a diaphragm 12 can be obtained by using a thermoplastic resin molded into a predetermined shape. As the thermoplastic resin, a polyolefin-based resin can be used. For example, polypropylene containing glass fiber, polypropylene containing carbon fiber, polypropylene containing mica, and foamed polypropylene can be used.

  The edge 14 is an elongated annular flexible thin plate disposed along the outer peripheral edge of the diaphragm 12, and supports the diaphragm 12 on the frame 16 so as to freely vibrate. The edge 14 is an outer peripheral part, which is a gasket part connected and fixed to the frame 16, an inner peripheral part of the gasket part, and a thin corrugated part attached to the outer peripheral edge of the diaphragm 12. The corrugated portion can move with respect to the frame 16, and thereby the diaphragm 12 can be supported in a freely oscillating manner. As the edge 14, a thermoplastic elastomer that is molded into a predetermined shape having flexibility can be used. As the thermoplastic elastomer, polyurethane, polyolefin, polyamide, and polyethylene can be used. For example, polystyrene can be used.

  As the connecting and fixing means between the gasket portion of the edge 14 and the frame 16, and the connecting means between the corrugated portion of the edge 14 and the diaphragm 12, an appropriate adhesive can be used. In this way, the diaphragm 12 and the edge 14 can be used by connecting individually manufactured ones with an adhesive, but instead, the diaphragm is formed by a two-color molding method in which different resins are integrally molded. What united 12 and the edge 14 may be used.

  As shown in FIG. 2 (d), the frame 16 is a housing having a through hole 17 at the center. In the through hole 17, the magnetic circuit 20, the voice coil 50, and the diaphragm 12 connected thereto are arranged. Further, the terminal 18 provided at the end of the longitudinal axis AA ′ in the frame 16 has a terminal plate 19 connected mechanically and electrically to each of the tinsel wires 70 and 72 of the voice coil 50. Have. The terminal 18 is connected to an external signal line of the electrodynamic speaker 10. As such a frame 16, a material obtained by molding a material having an appropriate strength into a predetermined shape can be used. For example, a resin molded product can be used, and instead of this, a steel plate formed into a predetermined shape may be used. When the frame 16 is formed of an insulating material, the terminal 18 can be configured by attaching the terminal plate 19 to a part of the frame 16.

  As shown in FIG. 2 (e), the magnetic circuit 20 includes a yoke 22 having a bottom plate portion and an elongated annular outer peripheral wall projecting from the bottom plate portion, and a track-type shape disposed on the top surface of the yoke 22. The magnet 24 has a track-shaped center pole 26 disposed on the upper surface of the magnet 24, and an elongated annular magnetic gap 28 is formed between the outer peripheral surface of the center pole and the inner peripheral surface of the outer peripheral wall of the yoke 22. It is an inner magnet type magnetic circuit to be formed. The yoke 22 and the center pole 26 are made of a magnetic material. In some cases, an external magnetic type magnetic circuit may be used.

  In the magnetic circuit 20, an appropriate adhesive can be used as a fixing means between the yoke 22 and the magnet 24 and between the magnet 24 and the center pole 26. The magnetic circuit 20 is connected and fixed to a magnetic circuit mounting portion (not shown) of the frame 16. An appropriate adhesive can be used as the means for coupling and fixing.

  Since the magnetic flux from the magnet 24 flows between the yoke 22 and the center pole 26 via the magnetic gap 28, the magnetic flux density in the magnetic gap 28 has a high value. An elongated annular voice coil 50 is inserted and disposed in the elongated annular magnetic gap 28. Therefore, by supplying an electrical signal corresponding to the sound to the coil 54 of the voice coil 50, the voice coil 50 moves in a direction perpendicular to the direction of flow of magnetic flux and in a direction perpendicular to the direction of current flowing in the coil 54. Driven and vibrates.

  The damper 30 is for arranging the voice coil 50 at a predetermined position of the magnetic gap 28. The center portion of the bottom surface is fixed to the upper surface of the center pole 26 of the magnetic circuit 20, and the end portion in the longitudinal axis direction of the peripheral portion is formed. The voice coil 50 is fixed to the inner wall surface of the bobbin 52. “Arranged at a predetermined position” means that the position of the coil 54 of the voice coil 50 along the central axis OO ′ is exactly the height dimension of the magnetic gap 28 when the electrodynamic speaker 10 is in the initial state. The neutral state is at the center. As a means for fixing the damper 30, an appropriate adhesive can be used. As this damper 30, what shape | molded the material which has a softness | flexibility in a predetermined shape can be used. For example, a material obtained by impregnating a woven fabric or a nonwoven fabric with a phenol resin can be used by molding it into a predetermined shape. The damper 30 can be omitted depending on the specifications of the electrodynamic speaker 10.

  FIG. 3 is a diagram in which the voice coil 50 of FIG. The voice coil 50 includes a bobbin 52 formed in an elongated annular shape, a coil 54 wound along the elongated annular shape of the bobbin 52, and a winding start terminal 56 and a winding end terminal 58 of the coil 54. 60 and 62 are configured to include two tinsel wires 70 and 72 that are drawn out on both sides of the connection points 60 and 62.

  The bobbin 52 is a thin insulating cylindrical member formed in an elongated annular shape having a longitudinal axis A-A 'and a short axis B-B' as symmetry axes. A center pole 26 of the magnetic circuit 20 is disposed in the central space of the bobbin 52, and a yoke 22 of the magnetic circuit 20 is disposed outside the elongated annular shape of the bobbin 52. That is, the bobbin 52 is inserted and disposed in the elongated annular magnetic gap 28 in the magnetic circuit 20. The thickness of the bobbin 52 is preferably as thin as it can support the coil 54 wound around the bobbin 52 and has a strength capable of maintaining an elongated annular shape. As an example, it is about 15% to 25% and about 0.03 mm to about 0.10 mm.

  The bobbin 52 may be formed by bending a thin plate into a predetermined elongated annular shape. As the thin plate, a metal foil or resin film having appropriate strength and heat resistance can be used. Aluminum foil can be used as the metal foil. A polyimide (PI) film can be used as the resin film.

  The coil 54 is formed by winding a conductive wire with insulation coating along the elongated annular outer peripheral surface of the bobbin 52 with a predetermined number of turns. Conductive wires with insulation coating may be laminated. The thickness of the coil 54 disposed on the bobbin 52 is (the outer diameter of the conductor wire with insulation coating × the number of laminated layers). As a means for fixing the winding on the bobbin 52, an appropriate adhesive can be used. As shown in FIG. 3, the winding start terminal 56 and the winding end terminal 58 of the coil 54 wound around the bobbin 52 with a predetermined number of turns are arranged such that the longitudinal axis AA ′, which is a symmetrical axis, is an elongated shape of the bobbin 52 or the coil 54. It is drawn to the position of two symmetrical intersections that intersect the annular shape.

  The predetermined number of turns of the coil 54 is set according to the specification of the electrodynamic speaker 10. An example is about 40 to about 100 turns. As a conducting wire with an insulation coating, a copper wire having a circular cross section can be used which is coated with an insulating varnish. The outer diameter of the conductive wire with insulation coating can be set from the operating range of the diaphragm 12 in the electrodynamic speaker 10. As an example, it may be about 0.05 mm to about 0.15 mm.

  The coil winding width dimension, which is the length along the central axis O-O ′ of the coil 54, is preferably slightly larger than the height dimension S of the magnetic air gap 28. By doing in this way, the movement drive along the central axis O-O ′ of the voice coil 50 can be performed stably in the range of the stroke of about 2S.

  The tinsel wires 70 and 72 are conductor wires that are thicker than the thin insulated wire that is the element wire of the coil 54. The positions of the winding start terminal 56 and the winding end terminal 58 of the coil 54 are connection points 60 and 62, respectively. Conductive wires with insulation coating connected to connection points 60 and 62, respectively. Each of the tinsel wires 70 and 72 connects the central portion of one straight tinsel wire to connection points 60 and 62, and as shown in FIG. It is drawn and drawn on both sides of A ′, and both ends are bent there. Both the stretching direction and the bending direction are parallel to the reference plane defined by the long axis A-A 'and the short axis B-B'.

  For example, the tinsel wire 70 connects the central portion of one straight tinsel wire to the connection point 60, and the longitudinal axis AA ′ and the short axis B− are connected to both sides of the longitudinal axis AA ′ from the connection point 60. It is drawn out in parallel with the reference plane defined by B ′, and both end portions thereof are bent in a direction toward the A ′ direction in parallel with the reference plane. Similarly, the center of one straight tinsel line is connected to the connection point 62 and the longitudinal axis AA ′ and the short axis B are connected to both sides of the longitudinal axis AA ′ from the connection point 62. It is drawn out in parallel with the reference plane defined by −B ′, and both ends thereof are bent in a direction toward the A direction in parallel with the reference plane.

  As the tinsel wires 70 and 72, a plurality of conductor strands twisted or knitted into a single conductor wire can be used. As the conductor wire of the tinsel wires 70 and 72, a copper wire, a copper tin alloy wire, a silver-plated gold copper tin alloy wire or the like can be used.

4 is a diagram showing an OA cross section in FIG. 1 when the electrodynamic speaker 10 is in an initial state, that is, when the diaphragm 12 is in a neutral state. Note that the OA ′ cross section is symmetrical to this, and thus illustration is omitted. Here, the arrangement relationship of the above-described elements, particularly, the gap dimension along the AA ′ axis direction, the height dimension S along the OO ′ axis direction, and the central axis of the coil 54 for the magnetic air gap 28. The coil winding width dimension along the OO ′ direction and the spacing distance which is a linear distance along the longitudinal axis AA ′ between the connection point 62 on the bobbin 52 and the terminal plate 19 of the terminal 18 of the frame 16. D ₀ is indicated.

As shown in FIG. 4, (the thickness of the bobbin 52 + the thickness of the coil 54) is set sufficiently smaller than the gap dimension d of the magnetic gap 28. The coil winding width dimension of the coil 54 is set slightly larger than the height dimension S of the magnetic gap 28. The maximum stroke value when the voice coil 50 is driven to move can be assumed to be approximately 2S. Therefore, it is necessary for the tinsel wire 72 to follow the movement of the stroke 2S under a state in which the connection point 62 and both sides of the terminal board 19 are fixed. Therefore, the tinsel wire 72 needs to be longer than the interval distance D ₀ that is the linear distance so that it can bend between the connection point 62 and the terminal plate 19, and includes a margin length. It has a length D.

  In order to reduce the influence of the movement of the voice coil 50 by the stroke 2S, such as the mass of solder at the connection point of the tinsel wire 72, the direction of the tinsel wire drawing, etc., the margin of the tinsel wire 72 can be reduced. The flexible shape utilizing the length may be symmetrical with respect to the longitudinal axis AA ′. One method is to form the flexible shape of the tinsel wire 72 within a vertical plane defined by the longitudinal axis A-A 'and the central axis O-O'. However, when the electrodynamic speaker 10 is thin and there is not much distance between the height position of the terminal plate 19 provided on the terminal 18 of the frame 16 and the upper surface position of the frame 16, it is difficult to take this method. It is. In such a case, the flexible shape of the tinsel wire 72 is preferably formed in a plane parallel to the reference plane defined by the long axis A-A 'and the short axis B-B'. The same applies to the tinsel wire 70.

  FIG. 5 is a diagram showing a procedure for attaching the tinsel wires 70 and 72 to the coil 54 to form a flexible shape. FIG. 6 is a view showing a jig 100 used for forming a flexible shape, and FIG. 7 is a view showing a state in which the flexible shape is formed using the jig 100.

  5 are cut along a plane parallel to a reference plane defined by the longitudinal axis AA ′ and the short axis BB ′ passing through the winding start terminal 56 and the winding end terminal 58 of the coil 54. FIG.

  FIG. 5A is a diagram showing a process of preparing two straight tinsel wires 64 and 66 and a bobbin 52 and a coil 54 before the tinsel wires 64 and 66 are connected. The winding start terminal 56 and the winding end terminal 58 of the coil 54 are drawn to the intersection where the longitudinal axis A-A ′ intersects the outer shape of the coil 54. The winding start terminal 56 and the winding end terminal 58 of the coil 54 need to have the insulation coating removed beforehand, and it is preferable to perform a pre-soldering process.

FIG. 5B shows the positions of the winding start terminal 56 and the winding end terminal 58 of the coil 54 as connection points 60 and 62, and the connection points 60 and 62 are respectively connected to the two straight tinsel wires 64 and 66. It is a figure which shows the process of connecting a center part by connection means, such as soldering. In the central part of the tinsel wires 64 and 66, it is preferable that the insulation coating is removed in advance and a preliminary soldering process is performed. The two tinsel wires 64 and 66 connected by soldering or the like extend to both sides symmetrically with respect to the longitudinal axis AA ′. For example, the tinsel wire 64 is connected to the coil winding start terminal 56 at the connection point 60, and the left side portion 64 _L extending from the connection point 60 in the B direction and the right side portion 64 _R extending from the connection point 60 in the B ′ direction. Consists of. Similarly, the tinsel wire 66 is connected to the coil winding end terminal 58 at the connection point 62, and the left side portion 66 _L extending from the connection point 62 in the B direction and the right side portion 66 _R extending from the connection point 62 in the B ′ direction. Consists of.

  FIG. 5 (c) shows that the left and right extension portions of the tinsel wires 64 and 66 extending symmetrically with respect to the longitudinal axis AA ′ from the connection points 60 and 62 are bent and shaped parallel to the longitudinal axis AA ′. It is a figure which shows the process to do. FIG. 5C corresponds to the cross-sectional view of FIG.

For example, the left side portion 64 _L of the tinsel wire 64 in FIG. 5B is bent along the elongated annular shape of the bobbin 52 from the connection point 60, and further in the A ′ direction before the position where the arc portion of the elongated annular shape ends. the left side portion 70 _L bent parallel to. Similarly, the right side portion 64 _R of the tinsel wire 64 in FIG. 5B is bent along the elongated annular shape of the bobbin 52 from the connection point 60, and further A ′ before the position where the arc portion of the elongated annular shape ends. the right side portion 70 _R is bent parallel to the direction. The left side portion 70 _L and the right side portion 70 _R constitute a tinsel wire 70 in which the left and right extension portions are shaped parallel to the longitudinal axis AA ′. The tinsel wire 66 in FIG. 5 (b) becomes the tinsel wire 72 in which the left and right extension portions are shaped parallel to the longitudinal axis AA ′ by the same shaping process.

  FIG. 5 (d) shows a symmetric flexibility with respect to the longitudinal axis AA ′ with respect to the tinsel wires 70 and 72 in which the left and right stretched portions are shaped parallel to the longitudinal axis AA ′ in FIG. 5 (c). It is a figure which shows the process of forming a shape and putting together the both ends.

For example, the tinsel wire 70 of FIG. 5C is shaped into flexible shapes 82 and 84 in which the left side 70 _L and the right side 70 _R are symmetrical with respect to the longitudinal axis AA ′, respectively. One end of each of the flexible shapes 82 and 84 is a connection point 60, and the other end is a temporary summary point 88. This is a summary line 86 in which both end portions are gathered together at the temporary summary point 88. The flexible shapes 82 and 84 and the summary line 86 form a tinsel wire 80 shaped into two flexible shapes.

  The total bending length between the connection point 60 of the flexible shape 82 and the temporary summary point 88 is the length D described above. Similarly, the total bending length between the connection point 60 of the flexible shape 84 and the temporary summing point 88 is the length D described above, and does not stretch when the voice coil 50 moves in the range of the stroke 2S. Thus, the margin length is set.

  Similarly, the tinsel wire 72 of FIG. 5C is shaped into flexible shapes 92 and 94, and becomes a summary line 86 in which both ends are gathered together at the temporary summary point 98. The flexible shapes 92 and 94 and the gathering line 96 constitute a tinsel wire 90 shaped into two flexible shapes. The total bending length D between the connection point 62 of the flexible shapes 92 and 94 and the temporary summing point 98 includes a margin length so that the voice coil 50 does not stretch even when moving in the range of the stroke 2S. Is set.

  FIG. 6 is a view showing the jig 100 used in the shaping process of FIG. The jig 100 is a specific jig having a specific shape capable of positioning and setting the elongated annular shape of the voice coil 50 in the state of FIG.

  The left and right positioning portions 102 and 104 provided on the A ′ side of the longitudinal axis AA ′ in the jig 100 are the shapes and positions of the most swollen portions of the flexible shapes 82 and 84 in the tinsel wire 80 in FIG. It is a positioning pin that decides. The temporary fixing portion 106 disposed away from the central position of the left and right positioning portions 102 and 104 in the direction opposite to the bobbin 52 has a positioning groove that defines a temporary gathering point 88 in the tinsel wire 80 of FIG.

  Similarly, the left and right positioning portions 103 and 105 provided on the A side of the longitudinal axis AA ′ in the jig 100 are the shapes of the most swollen portions of the flexible shapes 92 and 94 in the tinsel wire 90 in FIG. It is a pin that decides. The temporary fixing portion 107 disposed away from the center position of the left and right positioning portions 103 and 105 in the direction opposite to the bobbin 52 has a positioning groove that defines the temporary gathering point 98 in the tinsel wire 90 of FIG.

  FIG. 7 is a diagram showing a state in which the shaping process of FIG. 5D is performed using the jig 100 of FIG. Since the shaping process in the tinsel line 80 and the shaping process in the tinsel line 90 have the same contents, the shaping process in the tinsel line 80 will be described.

The one in which the damper 30 is disposed on the voice coil 50 in the state of FIG. 5C is positioned and set on the jig 100. Then, the left and right positioning portions 102 and 104 provided on the A ′ side of the jig 100 are respectively hooked with 70 _L and 70 _R that are both-side extended portions of the tinsel wire 70 described with reference to FIG. Next, the tip ends of 70 _L and 70 _R are collectively passed through the positioning groove of the temporary fixing portion 106. As a result, the tinsel wire 80 constituted by the flexible shapes 82 and 84 and the bundled line 86 and shaped into two flexible shapes is obtained.

  Similarly, the left and right positioning portions 103 and 105 and the temporary fixing portion 107 provided on the A side of the jig 100 are used to form flexible shapes 92 and 94 and a summary line 96, which are shaped into two flexible shapes. A tinned wire 90 is formed.

  When the voice coil 50 having the structure shown in FIG. 5D is obtained in this way, the ends of the bundled wires 86 and 96 of the tinsel wires 80 and 90 gathered by the temporary fixing portion 106 are mechanically and electrically connected. The voice coil 50 is removed from the jig 100 by connecting and fixing and integrating. For the process of mechanically and electrically connecting and fixing and integrating, soldering or the like can be used. Thus, the voice coil 50 to which the tinsel wire 80 having the predetermined flexible shapes 82 and 84 and the tinsel wire 90 having the predetermined flexible shapes 92 and 94 are attached is obtained. The obtained voice coil 50 is used when the electrodynamic speaker 10 is manufactured. At that time, a mechanically and electrically connected and fixed portion is integrated with the terminal plate 19 of the terminal 18 of the frame 16. Connect mechanically and electrically.

  After the voice coil 50 having the structure shown in FIG. 5D is obtained, the electrodynamic speaker 10 can be subsequently assembled and manufactured using the voice coil 50. In that case, the voice coil 50 having the structure shown in FIG. Then, the frame 16 with the magnetic circuit 20 is set using a predetermined assembly jig, and the voice coil 50 having the structure shown in FIG. Therefore, the front ends of the summary lines 86 and 96 are mechanically and electrically connected and integrated with the terminal plate 19 of the terminal 18 in the frame 16. Since the positions of the temporary summarization points 88 and 98 are almost the same as the position of the terminal board 19, it can be said that the temporary summarization points 88 and 98 are integrated by being mechanically and electrically connected.

  FIG. 8 is a diagram showing the result of confirming the vibration state of the diaphragm 12 by the laser Doppler method while comparing the operational effects of the above configuration with the prior art. FIG. 8A shows the result for the electrodynamic speaker 10 having the structure described with reference to FIGS. 1 to 7, and FIG. 8B shows the result for the electrodynamic speaker of the prior art. As a conventional technique, the connection points corresponding to the beginning and end of winding of the tinsel wire are provided at the intersection where the longitudinal axis AA ′ intersects the elongated annular voice coil as in (a). A voice coil having a structure that is extended only to one side of the short axis BB ′ from the intersection and does not form a symmetrical flexible shape on the AA ′ axis was used.

  FIG. 8 shows the velocity distribution of the diaphragm 12. FIG. 8A shows a good balance between the track-shaped diaphragm 12 oscillating at a uniform speed. On the other hand, the prior art (b) shows that the velocity distribution of the diaphragm is not uniform, and in particular, there is a resonance R1 along the short axis generated based on the elongated annular shape. It is shown that there is a rolling R2 that occurs based on the annular shape. In (a), it can be seen that such resonance and rolling are suppressed.

  In the above, the structure is such that the kinked wire having a symmetrical shape is attached to the longitudinal axis AA ′ side of the elongated annular voice coil, but this is attached to the short axis BB ′ side. It is good also as what attaches the tinsel wire which has a symmetrical flexible shape.

  FIG. 9 is a view showing a voice coil 51 having a structure in which a tinsel wire having a symmetric flexible shape is attached to the short axis B-B ′ side of an elongated annular voice coil. FIG. 9 is a diagram corresponding to FIG. 5D, and the coil winding start terminal 57, the winding end terminal 59, and the connection points 61, 63 are respectively connected to the coil winding start terminal 56, the winding of FIG. Although it corresponds to the end terminal 58 and the connection points 60 and 62, the short axis BB ′ is different from that of the elongated annular shape. The tinsel lines 81 and 91 correspond to the tinsel lines 80 and 90 in FIG. The flexible shapes 83 and 85 constituting the tinsel wire 81 and the summary line 87 correspond to the flexible shapes 82 and 84 and the summary line 86 of FIG. 95 and the summary line 97 correspond to the flexible shapes 92 and 94 and the summary line 96 of FIG.

  The electrodynamic speaker using the voice coil 51 having the structure shown in FIG. 9 also vibrates at a uniform speed over the entire diaphragm, as described with reference to FIG. Is good.

10 Electrodynamic Speaker, 12 Diaphragm, 14 Edge, 16 Frame, 17 Through Hole, 18 Terminal, 19 Terminal Board, 20 Magnetic Circuit, 22 Yoke, 24 Magnet, 26 Center Pole, 28 Magnetic Gap, 30 Damper, 50, 51 boil coil, 52 bobbin, 54 coil, 56, 57 winding start terminal, 58, 59 winding end terminal, 60, 61, 62, 63 connection point, 64, 66, 70, 72, 80, 81, 90, 91 Line, 64 _L , 66 _L , 70 _L left side, 64 _R , 66 _R , 70 _R right side, 88, 98 Temporary summary point, 82, 83, 84, 85, 92, 93, 94, 95 Flexible shape, 86, 87, 96, 97 Summary line, 100 Jig, 102, 103, 104, 105 Left-right positioning part, 106, 107 Temporary fixing part.

Claims (7)

A bobbin formed in an elongated annular shape having a longitudinal axis and a short axis as symmetry axes;
A coil that is wound along the elongated annular shape of the bobbin and from which a winding start terminal and a winding end terminal are drawn out at positions of two symmetrical intersections where the axis of symmetry intersects the elongated annular shape;
In each of the winding start terminal and the winding end terminal of the coil, a tinsel wire drawn out by extending from the connection point to both sides of the symmetry axis with the symmetry intersection as a connection point;
A voice coil comprising: The voice coil according to claim 1,
The silk thread line is
Extending and bending from the connection point to both sides of the symmetry axis to form a predetermined flexible shape that is symmetric with respect to the symmetry axis, and both ends thereof are mechanically and electrically connected and fixed to be integrated. The voice coil. The voice coil according to claim 2,
The predetermined flexible shape is a voice coil formed in a plane parallel to a reference plane defined by the long axis and the short axis. The voice coil according to claim 1,
The two symmetric intersections are two voice coils where the longitudinal axis intersects the elongated annular shape. The voice coil according to any one of claims 1 to 4,
A magnetic circuit having a magnetic air gap corresponding to the elongated annular shape in which the coil of the voice coil is disposed so as to vibrate;
A frame to which the magnetic circuit and the edge are connected;
A diaphragm having an outer peripheral end connected to the edge and an inner peripheral end connected to the bobbin of the voice coil;
Comprising at least
An electrodynamic speaker having a terminal including a terminal plate to which the both ends of the tinsel wire are connected and fixed to the frame corresponding to the elongated annular shape at positions where the extended symmetry axes respectively intersect. Two symmetrical intersections of the winding start terminal and the winding end terminal of a coil wound on a bobbin formed in an elongated annular shape having a longitudinal axis and a short axis as symmetry axes, the symmetry axis intersecting the elongated annular shape A coil forming step of pulling out the winding start terminal and the winding end terminal in the position of
In each of the winding start terminal and the winding end terminal of the coil, a tinsel wire connecting step of connecting and fixing a tinsel wire so as to extend from the connection point to both sides of the symmetry axis with the symmetry intersection as a connection point;
A jig setting step for setting the bobbin, which is connected and fixed to the tinsel wire extending on both sides around the connection point, to a predetermined jig;
After hooking each of the both-side extended portions of the tinsel wire to the left and right positioning portions provided on the predetermined jig, the temporary fixing portion disposed away from the center position of the left and right positioning portions in the direction opposite to the bobbin. A flexible shape forming step of forming the tinsel wire in a predetermined flexible shape symmetric with respect to the symmetry axis between the connection point and the temporary fixing portion through the distal end side of the both side extending portions;
The bobbin formed with the flexible shape of the tinsel wire is integrated by mechanically and electrically connecting and fixing the both ends of the tinsel wire gathered by the temporary fixing portion. External connection process to remove from the jig,
A method for manufacturing a voice coil, comprising: A winding start terminal and a winding end terminal of a coil wound around a bobbin formed in an elongated annular shape having a longitudinal axis and a short axis as a symmetry axis, and the symmetry axis is the elongated annular shape. A coil forming step of a voice coil for drawing out the winding start terminal and the winding end terminal at the positions of two intersecting intersections,
In each of the winding start terminal and the winding end terminal of the coil, a tinsel wire connecting step of connecting and fixing a tinsel wire so as to extend from the connection point to both sides of the symmetry axis with the symmetry intersection as a connection point;
A jig setting step of setting the bobbin, which is connected and fixed to the tinsel wire extending on both sides around the connection point, to a predetermined jig;
After hooking each of the both-side extended portions of the tinsel wire to the left and right positioning portions provided on the predetermined jig, the temporary fixing portion disposed away from the center position of the left and right positioning portions in the direction opposite to the bobbin. A flexible shape forming step of forming the tinsel wire in a predetermined flexible shape symmetric with respect to an axis of symmetry between the connection point and the temporary fixing portion through the distal end side of the both side extending portions;
A terminal forming step of forming a terminal including a terminal plate to which the both ends of the tinsel wire are connected and fixed to the frame corresponding to the elongated annular shape at a position where the extended symmetry axes of the voice coil intersect;
A frame jig setting step for setting the frame on an assembly jig;
The flexible shape of the tinsel wire is integrated by mechanically and electrically connecting and fixing the both ends of the tinsel wire gathered at the temporary fixing portion to the terminal plate of the terminal of the frame. An external connection step of removing the voice coil and the frame formed from a predetermined jig;
A method of manufacturing an electrodynamic speaker including the above.

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