JP4587082B2 - Electrodynamic speaker and manufacturing method thereof - Google Patents

Description

  The present invention relates to an elongated electrodynamic speaker having a shorter minor axis direction than the major axis direction, excellent in sound reproduction capability, and suitable for being attached to a device such as a display, and a manufacturing method thereof About.

  In an audio device such as a display to which a speaker for reproducing sound is attached, it is desired to reduce the space required for attaching the speaker. In particular, slender (rectangular, oval (including elliptical, track-shaped)) electrodynamic speakers have a diaphragm area limited in the minor axis direction, and are affected by the division vibration that is typical of slender speaker diaphragms. It is difficult to obtain a large and flat reproduction sound pressure frequency characteristic, and if a magnetic circuit for a speaker with a high magnetic gap magnetic flux density is used, the magnetic circuit is wider than the speaker diaphragm and cannot be reduced in size. There are disadvantages in audio playback capability for various reasons. Therefore, conventionally, various speaker diaphragms, speaker magnetic circuits, and electrodynamic speakers using the same have been proposed in order to solve these problems.

  For example, conventionally, a magnetic circuit having a magnetic gap, a frame formed in one of an elliptical shape, a rectangular shape, and an oval shape coupled to the upper surface of the magnetic circuit, and a voice that fits into the magnetic gap. A diaphragm having a coil coupled to the center and a peripheral edge coupled to the outer periphery of the frame, and an elliptical or rectangular shape having an inner peripheral portion coupled to the intermediate portion of the voice coil and an outer peripheral portion in the major axis direction coupled to the frame There is a speaker composed of a damper formed into a shape or an oval shape (Patent Document 1). By adopting the above configuration, this speaker has a structure that can increase the area of the damper, increase the flexibility, and increase the amplitude, providing a high-quality speaker with a wide playback band and low distortion. The purpose is to do.

  Conventionally, a magnetic circuit having a magnetic gap, an elongated frame coupled to the upper surface of the magnetic circuit, a voice coil fitted into the magnetic gap, and an inner periphery coupled to the voice coil A damper coupled to the frame, a damper having an inner circumference coupled to the voice coil, an outer circumference coupled only in the major axis direction of the frame, and one of the major axis directions set to have a shorter distance from the center than the other. There is a speaker constituted by a tinted wire of a voice coil drawn out from a shorter side of the damper in the major axis direction (Patent Document 2). In this speaker, the side of the damper's tinsel wire drawn out is shortened to balance the weight balance of the vibration system and suppress rolling in the major axis direction during large input to the speaker, preventing contact with the voice coil plate. Thus, the generation of abnormal sounds is attempted (FIGS. 1 and 2).

  However, the loudspeaker described in Patent Document 2 uses a special damper in which one of the major axis direction is set to have a shorter distance from the center than the other. The problem is solved by pulling out the tinsel wire of the coil, and there is a problem that it is impossible to use a normal elongated damper.

  In addition, as described in Patent Document 1, in the slender electrodynamic speaker, the tinsel wire that bridges between the voice coil and the external connection terminal is drawn from the major axis direction of the damper, and as a result, In a speaker having a low minimum resonance frequency, when a large input is applied and the amplitude is increased, rolling in the long diameter direction may occur, and a problem may occur that abnormal sound is generated when the voice coil hits the plate. In addition, when the tinsel wire is pulled out from the major axis direction of the damper, the tinsel wire becomes long, and as a result, a jumping movement of the tinsel wire occurs, and the tinsel wire becomes a speaker diaphragm, a damper, or a frame. There may be a problem that abnormal noise occurs due to contact, resulting in malfunction. 7 and 8 of Patent Document 3 describe a speaker that fixes an intermediate portion of a tinsel wire to a pasting portion of a damper.

JP-A-8-51695 JP-A-11-27794 Japanese Utility Model Publication No. 2-896

  The present invention has been made in order to solve the above-described problems of the prior art, and an object of the present invention is an elongated electrodynamic speaker having a shorter minor axis direction than a major axis direction. Even if it is pulled out from the major axis direction of the damper, it is easy to manufacture, the quality is stable without rolling, etc., and the tinsel wire touches the speaker diaphragm etc. so that abnormal noise is generated It is to provide an electrodynamic speaker without any problems.

The electrodynamic speaker of the present invention is an elongated electrodynamic speaker having a major axis direction and a minor axis direction. The damper is arranged so that the voice coil can be oscillated in the magnetic gap of the magnetic circuit, and the magnetic circuit is fixed. a frame for a tinsel wire to conduct the voice coil, and a damper base for fixed against the frame fixed to the damper to the magnetic circuit, provided with, the elongated damper having a major axis and a minor axis direction, the major axis The damper base having a fixed part fixed to the damper base at the outer peripheral end in the direction and having an elongated frame body having a major axis direction and a minor axis direction, and a long diameter side frame part to which the damper fixing part is fixed A short-diameter side frame portion having an inner dimension larger than the length between the short-diameter side end portions on both sides of the damper, and the intermediate portion of the tinsel wire is fixed to the frame body of the damper base The

  Preferably, the electrodynamic speaker of the present invention is a jig in which a shaping jig for shaping a tinsel wire is inserted between a short-diameter side frame portion of a damper base and a short-diameter side end portion of an elongated damper. Define the insertion gap.

  Preferably, in the electrodynamic speaker according to the present invention, the tinsel wire is shaped by a shaping jig between one end fixed to the voice coil and an intermediate portion fixed to the frame of the damper base. And the top of the arc that defines the bending portion is shaped so as to be located on the outer side in the minor axis direction than the jig insertion gap.

  Preferably, in the electrodynamic speaker according to the present invention, the damper includes a plurality of elongated dampers spaced apart in the direction in which the voice coil vibrates, and the damper base fixes the plurality of elongated dampers, respectively. A plurality of damper bases, and the elongated frames of the plurality of damper bases are overlapped and connected.

The method of manufacturing an electrodynamic speaker of the present invention is a method of manufacturing an elongated electrodynamic speaker having a major axis direction and a minor axis direction, and is an elongated damper having a major axis direction and a minor axis direction. Forming a fixing portion at the outer peripheral end in the major axis direction, electrically connecting one end of the tinsel wire to the voice coil, and fixing one end of the tinsel wire to the bobbin of the voice coil, and the major axis direction A damper base having an elongated frame having a minor axis direction is formed, and the inner side is larger than the length between the major axis side frame part to which the fixed part of the damper is fixed and the minor axis side ends on both sides of the damper. A step of forming a short side frame portion having a size and a distance, a step of fixing the frame and the magnetic circuit, and a voice coil so as to be disposed in a magnetic gap of the magnetic circuit so as to vibrate. The bobbin of the coil and the inner periphery of the damper Wear, and a step to fix the fixing portion of the damper in the damper base, for fixing the damper base and affixing against the fixed frame in the magnetic circuit, the intermediate portion of the tinsel wire, to the frame of the damper base, including.

  Preferably, in the method of manufacturing the electrodynamic speaker of the present invention, in the step of fixing the intermediate portion of the tinsel wire to the frame of the damper base, the short-diameter side frame portion of the damper base and the short-diameter side of the damper It further includes a step of defining a jig insertion gap for inserting a shaping jig for shaping the tinsel wire between the ends, and a shaping jig is inserted into the jig insertion gap and fixed to the voice coil of the tinsel wire A step of forming a curved portion shaped by a shaping jig between the one end to be fixed to the frame of the damper base, and the apex of the arc defining the curved portion is inserted into the jig Further comprising a step of shaping the tinsel wire and removing the shaping jig so as to be positioned outside the gap in the minor axis direction.

  Preferably, in the method for manufacturing an electrodynamic speaker according to the present invention, the damper includes a plurality of elongated dampers spaced apart in a direction in which the voice coil vibrates, and the damper base fixes the plurality of dampers, respectively. In the case of including a plurality of damper bases, the plurality of damper bases includes a step of overlapping and connecting the respective elongated frames.

  The operation of the present invention will be described below.

The electrodynamic speaker of the present invention is an elongated electrodynamic speaker in which a magnetic circuit, a speaker diaphragm, or a frame has a major axis direction and a minor axis direction, and a voice coil wound around a bobbin is magnetized. A damper that is arranged so as to be able to vibrate in the magnetic gap of the circuit, a frame that fixes the magnetic circuit, a tinsel wire that conducts to the voice coil, and a damper base that fixes the damper to the frame fixed to the magnetic circuit. ing. The damper is an elongated frame having a major axis direction and a minor axis direction. The damper has a fixing portion fixed to a damper base at an outer peripheral end in the major axis direction, and has a major axis direction and a minor axis direction. It is fixed to a damper base having The damper base includes a long-diameter side frame portion to which a fixed portion of the damper is fixed, and a short-diameter side frame portion having an inner dimension larger than the length between the short-diameter side end portions on both sides of the damper and separated from each other. It is equipped with. The major axis direction is a direction in which a major axis defining a rectangle, an ellipse, an ellipse, or an elongated shape including a track shape extends, and the minor axis direction is a direction in which a minor axis orthogonal to the major axis extends. It is.

  Specifically, the damper may include a plurality of elongated dampers spaced apart in the direction in which the voice coil vibrates, and the damper base fixes a plurality of elongated dampers respectively. A damper base may be included and the elongated frames of each of the plurality of damper bases may be overlapped and connected. For example, the elongated damper is a two-stage (double) damper composed of a front damper and a rear damper in the front-rear direction in which the voice coil vibrates, and the damper base is a rectangular frame formed of resin. It is only necessary that the fixing portions of the front damper and the rear damper are fixed to the long-diameter side frame portion of the damper base to be fixed correspondingly. If the elongated frames constituting the plurality of damper bases are overlapped and connected, the fixing positions of the plurality of dampers with respect to the voice coil are determined, so that the manufacturing process can be facilitated.

  Here, in the electrodynamic speaker of the elongated direction of the short diameter direction compared to the long diameter direction of the present invention, the tinsel wire is drawn out from the major diameter direction of the damper, and the middle portion of the tinsel wire is the tinsel of the frame of the damper base Fixed to the wire fixing part. Compared to pulling out from the short diameter direction, the tinsel wire with one end fixed to the bobbin of the voice coil and the other end fixed to the terminal becomes longer when pulled out from the long diameter direction. By fixing the intermediate part to the frame, it is possible to prevent contact with a damper or other components that are also long in the major axis direction. Therefore, in the electrodynamic speaker of the present invention, the tinsel wire does not come into contact with the speaker diaphragm or the like to generate abnormal noise.

  In addition, the electrodynamic speaker of the present invention has an elongated shape in which the short-diameter side frame portion of the damper base is separated with an inner dimension larger than the length between the short-diameter side end portions on both sides of the damper. A jig insertion gap for inserting a shaping jig for shaping the tinsel wire is defined between the short-diameter side end portion of the damper, and as a result, in the manufacturing process using the shaping jig, other components can be easily The tinsel wire can be shaped so that it does not touch. That is, between the one end fixed to the voice coil of the tinsel wire and the intermediate part fixed to the frame of the damper base, the curved portion is shaped with a shaping jig, and the vertex of the arc defining the curved portion is Thus, it is possible to prevent the tinsel wire from coming into contact with the damper, the speaker diaphragm, and the like that are long in the major axis direction so as to be positioned outside the jig insertion gap in the minor axis direction.

  In the method of manufacturing the electrodynamic speaker of the present invention, the tinsel wire is shaped using a shaping jig, and the middle part is fixed to the frame of the damper base. Even if the speaker diaphragm and the damper are used, the quality is stabilized without rolling or the like in the vibration system. Therefore, even if the electrokinetic speaker in which the tinsel wire is drawn out from the major axis direction of the damper, the generation of abnormal noise can be suppressed and an electrodynamic speaker excellent in reproduction sound quality can be realized.

  Even if it is a slender electrodynamic speaker with a shorter minor axis direction than the major axis direction, and the tinsel wire is drawn from the major axis direction of the damper, it is easy to manufacture and does not cause rolling etc. It is possible to provide an electrodynamic speaker that has stable quality and does not cause abnormal noise due to contact of the tinsel wire with the speaker diaphragm or the like.

  Even if it is a slender electrodynamic speaker with a shorter minor axis direction than the major axis direction, and the tinsel wire is drawn from the major axis direction of the damper, it is easy to manufacture and does not cause rolling etc. The purpose of providing an electrodynamic speaker with stable quality and no abnormal noise caused by contact of the tinsel wire with the speaker diaphragm, etc. The damper has a fixed portion fixed to the damper base at the outer peripheral end in the major axis direction, and the damper base having an elongated frame having a major axis direction and a minor axis direction is fixed to the damper fixing part. A long-diameter side frame portion, and a short-diameter side frame portion having an inner dimension larger than the length between the short-diameter side end portions on both sides of the damper, and an intermediate portion of the tinsel wire is disposed on the damper base Realized by being fixed to the frame.

  Hereinafter, the electrodynamic speaker and the manufacturing method thereof according to preferred embodiments of the present invention will be described, but the present invention is not limited to these embodiments.

1 and 2 are diagrams illustrating an electrodynamic speaker 1 according to a preferred embodiment of the present invention. FIG. 1A is a perspective view of the electrodynamic speaker 1 viewed from the front side, and FIG. 1B is a perspective view of the electrodynamic speaker 1 viewed from the back side. 2A is an OA cross-sectional view of the electrodynamic speaker 1, and FIG. 2B is a BB ′ cross-sectional view of the electrodynamic speaker 1. As will be described later, a part of the structure of the electrodynamic speaker 1, the internal structure, and the like are omitted. Further, the direction in which the straight line (major axis) connecting the points OA extends is the major axis direction, and the point OB
The direction in which the straight line (minor axis) connecting the two extends is the minor axis direction.

  The electrodynamic speaker 1 of this embodiment is an elongated electrodynamic speaker having a track-shaped speaker diaphragm 2 having a major axis direction length L1 of about 262.5 mm and a minor axis direction length L2 of about 25.5 mm. The speaker has a diaphragm area equivalent to that of a circular diaphragm having an aperture of about 130 mm even though it is elongated. The outer peripheral end of the speaker diaphragm 2 is supported by an edge 3, and the outer peripheral end of the edge 3 is fixed to the frame 6. A voice coil 4 is connected to the back side of the speaker diaphragm 2, and is supported by a damper 5 (a front damper 5a and a rear damper 5b) so as to vibrate. In the case of this embodiment, the voice coil diameter of the voice coil 4 is about 20 mm. The frame 6 has an elongated shape corresponding to the track-shaped speaker diaphragm 2, and the magnetic circuit 10 fixed to the frame 6 also has an elongated shape having a narrow width not more than the length L2 in the minor axis direction. Therefore, the electrodynamic speaker 1 is a speaker suitable for a device with a small width for mounting the speaker, such as a side surface of a display unit included in a device such as a display.

  The speaker diaphragm 2 of the electrodynamic speaker 1 has an inner peripheral side of the edge 3 bonded to the outer peripheral end thereof, and a bobbin 4a (not shown) constituting the voice coil 4 is bonded to the center rear surface. The speaker diaphragm 2 is formed by forming a foamed thermoplastic resin in order to reduce the weight of the speaker diaphragm. In the case of the present example, the speaker diaphragm 2 having ribs is obtained by using a thermoplastic resin foam sheet (specifically, polypropylene) formed by extrusion using a vacuum forming method in combination with plug assist molding. ing. That is, the elongated speaker diaphragm 2 in which the major axis direction length L1 and the minor axis direction length L2 are significantly different from each other tends to be noticeable due to the divisional vibration in the major axis direction. The radial cross-sectional shape is substantially W-shaped, and the shape has rigidity in the long-diameter direction.

  In this embodiment, the edge 3 is formed by injecting flexible foam rubber into a mold and heating and foaming. On the long side of the track shape extending linearly in the major axis direction of the speaker diaphragm 2, a free edge is formed by a thin corrugation (or roll) so as to freely support the speaker diaphragm 2, and an arc shape is formed in the minor axis direction. On the short side of the track shape, a fixed edge that does not vibrate freely is formed so as to fix and support the speaker diaphragm 2. As a result, the elongated speaker diaphragm 2 is flexibly supported by the compliance of the free edge portion of the edge 3 in the minor axis direction, while the thermoplastic resin foam sheet that forms the speaker diaphragm 2 in the major axis direction. Flexibility enables bending vibration.

  The voice coil 4 is formed of a bobbin 4a formed in a cylindrical shape, and a coil 4b wound around one end thereof and supplied with a sound current (not shown). The other end of the bobbin 4a around which the coil 4b is not wound is connected to the center of the back surface of the speaker diaphragm 2 with an adhesive. The coil 4b is disposed in a circular magnetic gap 13 of the magnetic circuit 10 to be described later. In addition, as will be described later, the tinsel wire 8 solders the terminal 7 fixed to the frame 6 and the lead wire of the coil 4b from the terminal 7 so as to conduct the current, and supplies an audio current to the coil 4b.

  The damper 5 is a two-stage damper composed of a front damper 5a and a rear damper 5b, and is formed by cutting a circular corrugation damper formed by impregnating a phenolic resin with a flexible woven fabric as a base material and forming an elongated shape. (Track type). The inner peripheral ends of the front damper 5a and the rear damper 5b are connected to the cylindrical outer surface side of the bobbin 4a to support the rear center side of the speaker diaphragm 2. The outer peripheral end sides of the front damper 5a and the rear damper 5b are fixed to a fixing portion of the frame 6 via a damper base 9 including a front damper base 9a and a rear damper base 9b described later. The damper 5 may be a corrugation damper of another shape, or may not be formed of two stages, and may be formed of another material, and connects the inner ring and the outer ring. Even a butterfly damper made of metal or resin has an elongated shape having a major axis direction and a minor axis direction, and has a fixing portion fixed to the damper base at the outer peripheral end in the major axis direction. If you do.

  The frame 6 is an iron plate frame that is press-molded into an elongated basket shape corresponding to the shape of the speaker diaphragm 2. The frame 6 has a substantially rectangular fixing portion that fixes the edge 3, and a fixing portion that fixes the magnetic circuit 10. A connecting portion for connecting these fixing portions, a window defined between the plurality of connecting portions, and a mounting hole for attaching the terminal 7 are provided. A damper base 9 for fixing the dampers 5 a and 5 b is fixed to the frame 6. Therefore, the speaker vibration system including the speaker diaphragm 2, the edge 3, the voice coil 4, the damper 5, and the damper base 9 is supported so as to be able to vibrate with respect to the frame 6.

  The terminal 7 is provided in the major axis direction of the elongated shape of each of the speaker diaphragm 2, the damper 5, and the frame 6, and is attached to the attachment hole of the frame 6. The terminal 7 has a + terminal and a − terminal fixed to the insulating base, and tinsel wires 8a and 8b drawn from the major axis direction of the damper 5 are soldered to the + terminal and the − terminal, respectively. Is fixed. Further, as shown in the cross-sectional view of FIG. 2A, in the tinsel wires 8a and 8b, an intermediate portion between the voice coil 4 and the terminal 7 is fixed to the damper base 9a.

  The magnetic circuit 10 includes an elongated top plate 11 that is fixed to the frame 6, a center pole 12 that is cylindrical and is inserted into a circular hole formed in the center of the top plate 11, and an elongated under plate 14. And two main magnets 15a and 15b magnetized in the same direction. The top plate 11 and the center pole 12 form a circular magnetic gap 13 having an equal width. The main magnets 15a and 15b are sandwiched between the top plate 11 and the under plate 14, and are symmetrically arranged in the major axis direction with the center pole 12 in the middle. The two main magnets 15a and 15b have substantially elongated shapes corresponding to the shapes of the elongated top plate 11 and the under plate 14, and the center side close to the center pole 12 has a circular shape of the center pole 12. A concave portion including a corresponding cylindrical curved surface is formed. The center pole 12 may be formed integrally with the under plate 14, or another piece may be fixed with an adhesive.

  The two main magnets 15a and 15b of the present embodiment are ferrite magnets, and may be Nd—Fe—B rare earth magnets having a larger residual magnetization and coercive force, and having a small volume and a strong coercive force. The rare earth magnet is an Nd—Fe—B type neodymium magnet or an Sm—Co type samarium cobalt magnet, which has a large maximum energy product (BH) max. The magnetic circuit 10 is an outer magnet type magnetic circuit in which a magnet is disposed outside a region to be projected when the coil 4b of the voice coil 4 is viewed in plan, and main magnets 15a and 15b having a strong coercive force are arranged in the major axis direction. Therefore, it is suitable for an elongated speaker such as the electrodynamic speaker 1 of the present invention. This is because if the maximum width of the magnetic circuit 10 can be reduced, the magnetic circuit 10 can be accommodated in a region formed when the elongated speaker diaphragm 2 is viewed from the front. Therefore, including the use of the lightweight speaker diaphragm 2, the highly efficient electrodynamic speaker 1 is realized.

  When an audio current is supplied to the coil 4b of the voice coil 4, a driving force is applied to the voice coil 4 disposed in the magnetic gap 13, and the voice coil 4 vibrates in the vertical direction in FIG. The made speaker diaphragm 2 also vibrates in the vertical direction. The speaker diaphragm 2 is flexibly supported by the free edge portion of the edge 3 that supports the outer peripheral end thereof in the minor axis direction. On the other hand, in the major axis direction, bending vibration is possible due to the flexibility of the thermoplastic resin foam sheet forming the speaker diaphragm 2, and the voice coil 4 is greatly displaced at a frequency near or below the lowest resonance frequency f0. The speaker diaphragm 2 fixed at both ends in the major axis direction is bent and deformed in an arc shape in the major axis direction.

  While the two main magnets 15a and 15b are arranged in the major axis direction of the magnetic circuit 10 of the present embodiment, no magnet (magnet) that generates a magnetic force is arranged in the minor axis direction. 10 has an open window portion 16 whose overall shape is elongated and communicates with the magnetic gap in the minor axis direction. The two main magnets 15a and 15b are arranged symmetrically with the center pole 12 as a point-symmetrical middle point in the major axis direction, that is, with the center pole 12 in the middle, and the main magnet 15a, the center pole 12 and the other One main magnet 15b is arranged in the major axis direction. When the magnetic circuit 10 is viewed from the side of the short diameter direction, an open window portion 16 in which the magnets 15a and 15b are not disposed is formed, and a hole is formed so that the cylindrical side surface of the center pole 12 can be directly viewed. Specifically, the open window portion 16 is defined by the top plate 11, the two main magnets 15 a and 15 b, and the under plate 14. In addition, you may cover the open window part 16 with a breathable nonwoven fabric etc. so that foreign materials, such as iron powder, may penetrate | invade into the magnetic space | gap 13. FIG.

  Further, even if the circular magnetic air gap 13 has a uniform width in the radial direction, the magnetic circuit 10 has different magnetic flux density distributions in the major axis direction and the minor axis direction, and the substantially cylindrical main magnets 15a and 15b. An extremely strong magnetic flux density is generated in the major axis direction where the circular magnetic gap 13 is closest, and the magnetic flux density in the major axis direction is higher than the magnetic flux density in the minor axis direction. Since the magnetic flux density distribution in the circumferential direction in the circular magnetic gap 13 is different between the major axis direction and the minor axis direction, the driving force for driving the speaker diaphragm 2 can also be different between the major axis direction and the minor axis direction. The peak dip of the frequency characteristic can be reduced.

  FIG. 3 is a diagram illustrating an assembly part of the vibration system of the electrodynamic speaker 1. That is, FIG. 3A is a perspective view of a preliminary assembly part including the voice coil 4, the damper 5, the damper base 9, and the tinsel wire 8 constituting the vibration system of the electrodynamic speaker 1. 3 (b) is a plan view of the preliminary assembly part. In the manufacturing process of the electrodynamic speaker 1, a vibration system preliminary assembly part is assembled on a jig (not shown), and the vibration system preliminary assembly part is mounted on the frame 6 and the magnetic circuit 10 which are bonded and fixed in advance. If the damper base 9 is fixed, the coil 4b can be disposed in the magnetic gap 13 of the magnetic circuit 10. Further, as described above, the upper end of the bobbin 4 a is bonded to the central back surface of the speaker diaphragm 2.

  In the present embodiment, since the front damper 5a and the rear damper 5b use two common dampers, the description of the rear damper 5b common to the description of the front damper 5a is omitted. Of course, the front damper 5a and the rear damper 5b may be different in material and stiffness. Similarly, in this embodiment, since the front damper base 9a and the rear damper base 9b use two common damper bases, the description of the rear damper base 9b common to the description of the front damper base 9a is as follows. Omitted.

  The cylindrical outer curved surface of the bobbin 4a of the voice coil 4 is fitted and bonded to the inner diameter ends of the front damper 5a and the rear damper 5b. Further, the elongated front damper 5a and rear damper 5b having a major axis direction and a minor axis direction are respectively fixed to the front damper base 9a and the rear damper base 9b at the outer peripheral ends in the major axis direction. (Not shown) 5bx, each fixed with an adhesive. Then, the front damper base 9a and the rear damper base 9b are overlapped and connected to constitute a pre-assembly component for the vibration system of the electrodynamic speaker 1 composed of a double damper.

  Since the front damper 5a and the rear damper 5b are formed by cutting a circular corrugation damper having an outer diameter of about 60.0 mm into an elongated shape (track shape), the plan view shown in FIG. As shown in the perspective view of FIG. 5A, the corrugation irregularities of the damper appear at the short-diameter side end portions 5ay and 5by that define the straight line portion. Further, the front damper base 9a and the rear damper base 9b are, for example, elongated frames having a major axis direction and a minor axis direction formed from ABS resin, and the fixing portion 5ax of the front damper 5a is fixed thereto. The long-diameter side frame portion 9ax and the short-diameter side frame portion 9ay having an inner dimension larger than the length between the short-diameter side end portions 5ay on both sides of the front damper 5a are separated. For example, when the length between the short diameter side ends 5ay on both sides of the front damper 5a of this embodiment (that is, the width in the short diameter direction of the front damper 5a) is about 26.0 mm, the front damper base 9a The inner dimension of the short-diameter side frame portion 9ay that is separated on both sides is about 29.0 mm, which is larger than the short-diameter side end portion 5ay. Therefore, in this vibration system pre-assembly part, the gap 20 having a width of 1.5 mm is formed between the short diameter side frame portion 9ay of the front damper base 9a and the short diameter side end portion 5ay of the front damper 5a. It is formed on both sides of the front damper 5a along the side end 5ay. As will be described later, the gap 20 functions as a jig insertion gap 20 for inserting shaping jigs Jga and Jgb for shaping the tinsel wires 8a and 8b.

  In the vibration system pre-assembled part shown in FIG. 3, the tinsel wires 8a and 8b connected to the coil 4b of the voice coil 4 come into contact with other components when the electric speaker 1 is assembled and operated. The intermediate portion is shaped and fixed in advance so as not to generate sound. Specifically, the intermediate portions 8ax and 8bx of the tinsel wires 8a and 8b are fixed with an adhesive to a tinsel wire fixing portion which is a flat surface formed on the long-diameter side frame portion 9ax of the front damper base 9a, The wires 8a and 8b are drawn from the major axis direction of the damper 5. As shown in the figure, the tinsel wires 8a and 8b are soldered to the voice coil 4 and fixed with an adhesive, and an intermediate portion fixed to the long-diameter side frame 9ax of the front damper base 9a with an adhesive. It is shaped by a shaping jig so as to have a curved portion including the vertices 8ay and 8by of the arc between 8ax and 8bx. In other words, the tinsel wires 8a and 8b are shaped so that the vertices 8ay and 8by of the arcs that define the curved portions are positioned outside the jig insertion space 20 in the short-diameter direction. The ends of the tinsel wires 8a and 8b on the terminal side are not shown, and the tinsel wires 8a and 8b are soldered to the positive terminal and the negative terminal of the terminal 7, respectively, and fixed so as to be conductive. Has been.

  Therefore, by using this vibration system pre-assembled part, the manufacturing method of the electrodynamic speaker 1 is simplified, the number of man-hours is reduced, the cost can be reduced, and the tinsel wires 8a and 8b are connected to the damper 5 Even if it is pulled out from the major axis direction, the quality is stable without causing rolling or the like, and the tinsel wires 8a and 8b are not brought into contact with the speaker diaphragm 2, etc., thereby suppressing the generation of abnormal noise. be able to. The vibration system preliminary assembly parts support the voice coil 4 so as to vibrate on the inner peripheral sides of the front damper 5a and the rear damper 5b, and the outer peripheral sides of the front damper 5a and the rear damper 5b are connected to each other. Since the front damper base 9a and the rear damper base 9b are fixed to each other, the coil 4b in the magnetic gap 13 of the magnetic circuit 10 can stably vibrate, and the tinsel wires 8a and 8b are also other components. It is because it can vibrate so that it may not touch.

  FIG. 4 is a diagram for explaining a part of the method for manufacturing the vibration system of the electrodynamic speaker 1. FIG. 4A is a cross-sectional view taken along the line AA ′ for explaining a longitudinal section of the pre-assembly part of the vibration system of the electrodynamic speaker 1, and FIG. 4B is a plan view of the pre-assembly part. It is a figure containing shaping jigs Jga, Jgb, and Jgc used in the manufacturing process. That is, the manufacturing method of the elongated electrodynamic speaker 1 is such that the elongated speaker diaphragm 2 and the edge 3 having the major axis direction and the minor axis direction and one end of the tinsel wires 8a and 8b are electrically connected to the coil 4b. Manufactures components such as the voice coil 4 fixed to 4a, the elongated damper 5 having a fixing portion at the outer peripheral end in the major axis direction, or the elongated frame 6 and the damper base 9 having an elongated frame. In addition to the step of performing, a step of assembling a pre-assembled part of the vibration system described below is included.

  As shown in FIG. 4, the bobbin 4a of the voice coil 4 and the inner peripheral ends of the front damper 5a and the rear damper 5b are fixed with an adhesive, and fixed portions 5ax of the front damper 5a and the rear damper 5b (not shown) ) 5bx is fixed to the respective long diameter side frame portions 9ax and 9bx of the front damper base 9a and the rear damper base 9b with an adhesive. The front-side damper base 9a and the rear-side damper base 9b are connected by overlapping their elongated frames. Then, the tinsel wires 8a and 8b, which are fixed at one end to the bobbin 4a of the voice coil 4, use the shaping jigs Jga and Jgc that intersect and the shaping jigs Jgb and Jgc that intersect, respectively. After being shaped into a shape along the set of tools, the intermediate portions 8ax and 8bx are fixed to the long-diameter side frame portion 9ax of the front damper base 9a with an adhesive.

  The shaping jigs Jga and Jgb are thin round bars, and are inserted into jig insertion gaps 20 formed on both sides of the front damper 5a along the short diameter side end 5ay. That is, the shaping jigs Jga and Jgb have a diameter substantially equal to the width of the jig insertion gap 20, and are arranged on the outer sides in the short-diameter direction of the tinsel wires 8 a and 8 b than the jig insertion gap 20. A curved portion including the vertices 8ay and 8by of the located arc can be formed. On the other hand, the shaping jig Jgc is a rod-shaped member having a substantially rectangular parallelepiped section, and is placed on the upper surface side of the front damper 5a to separate the front damper 5a from the tinsel wires 8a and 8b. Accordingly, the tinsel wires 8a and 8b are drawn out in the major axis direction so as to wrap around the upper side of the intersecting shaping jig Jgc on the outer sides of the shaping jigs Jga and Jgb, so that the intermediate portions 8ax and 8bx are moved to the front side. A curved portion which is fixed to the long-diameter side frame portion 9ax of the damper base 9a with an adhesive, and as a result, has a bulge on the side of the speaker diaphragm 2 and bulges outward in the short-diameter direction from the jig insertion gap 20. And the vertices 8ay and 8by of the arc of the curved portion are shaped into a shape located outside the jig insertion gap 20 in the short-diameter direction.

  When fixing the middle portions 8ax and 8bx of the tinsel wires 8a and 8b to the long-diameter side frame portion 9ax of the front damper base 9a with an adhesive, a notch (not shown) for temporarily fixing the tinsel wires 8a and 8 is used. Also good. The notch may be provided in the long-diameter side frame portion 9ax of the front damper base 9a, and can be drawn out from the long-diameter direction of the damper 5 by hooking the tinsel wires 8a and 8b. The shaping jigs Jga, Jgb, and Jgc may be removed at the stage where the adhesive for fixing the intermediate portions 8ax and 8bx of the tinsel wires 8a and 8b is solidified. In the case of fixing, the shaping jig can be removed early when the adhesive is solidified.

  After the shaping jigs Jga, Jgb and Jgc are removed, the tinsel wires 8a and 8b are shaped so as not to come into contact with other components including the front damper 5a. Therefore, the pre-assembly part of the vibration system of the electrodynamic speaker 1 in which the intermediate portions 8ax and 8bx of the tinsel wires 8a and 8b are fixed to the long diameter side frame portion 9ax of the front damper base 9a with an adhesive is the rear damper base 9b. Is fixed to the magnetic circuit 10 to which the frame 6 is fixed, so that the coil 4 b of the voice coil 4 can be easily arranged in the magnetic gap 13.

  Of course, when the voice coil 4 is arranged in the magnetic gap 13, a voice coil holder which is a jig inserted into the magnetic gap 13 may be used in combination. The voice coil 4 including the tinsel wires 8a and 8b is used for the magnetic circuit 10 to which the frame 6 is fixed, using the voice coil holder, in addition to the case where the preliminary assembly parts are preliminarily assembled separately from the magnetic circuit 10. Alternatively, the rear damper base 9b and the rear damper 5b, the front damper base 9a and the front damper 5a may be assembled in order to shape the tinsel wires 8a and 8b.

  The shaping jigs Jga and Jgb are not limited to the members having the above-mentioned shapes, and the vertices 8ay and 8by of the arcs of the curved portions of the tinsel wires 8a and 8b are located outside the jig insertion gap 20 in the short-diameter direction. As long as it can be inserted into the jig insertion gap 20, it is sufficient. Moreover, the jig | tool insertion space | gap 20 formed in the both sides of the front side damper 5a is not restricted to the case where it is linear form with the shape of the front side damper 5a. You may have the fitting part which prescribes | regulates the insertion position of the shaping jigs Jga and Jgb in the short diameter side frame part 9ay of the front side damper stand 9a. The shaping jig Jgc does not need to be separated from the shaping jigs Jga and Jgb, and any shape can be used as long as the curved portions of the tinsel wires 8a and 8b can be shaped three-dimensionally and can be easily inserted or removed.

  The electrodynamic speaker 1 of this embodiment may have dampers with different dimensions corresponding to other voice coil diameters. The electrodynamic speaker 1 is not limited to a track-type speaker diaphragm, and may be an elongated electrodynamic speaker having a large ratio between a major axis and a minor axis such as an ellipse, an ellipse, a rectangle, and a rectangle. Good.

  The electrodynamic speaker of the present invention can be applied not only as a speaker built in video / audio equipment such as a display but also to a game machine having a cabinet with a built-in speaker for reproducing sound, a game machine such as a slot machine, etc. It is. In addition, the electrodynamic speaker of the present invention is particularly suitable for a vehicle speaker in which the installation space is limited because a speaker system that reproduces sound in a small and thin cabinet can be realized.

It is a figure explaining the electrodynamic speaker 1 by preferable embodiment of this invention. Example 1 It is a figure explaining the electrodynamic speaker 1 by preferable embodiment of this invention. Example 1 It is a figure explaining the assembly component of the vibration system of the electrodynamic speaker 1 by preferable embodiment of this invention. Example 1 It is a figure explaining a part of manufacturing method of the vibration system of the electrodynamic speaker 1 by preferable embodiment of this invention. Example 1

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrodynamic type speaker 2 Speaker diaphragm 3 Edge 4 Voice coil 5a Front side damper 5b Rear side damper 6 Frame 7 Terminal 8a, 8b Kinshi wire 9a Front side damper base 9b Rear side damper base 10 Magnetic circuit 11 Top plate 12 Center pole 13 Magnetic Gap 14 Under plate 15a, 15b Main magnet 16 Open window 20 Jig insertion gap Jga, Jgb, Jgc Shaping jig

Claims (7)

An elongated electrodynamic speaker having a major axis direction and a minor axis direction,
A damper that can vibrate disposed in a magnetic gap of the magnetic circuit voice coil, a frame for fixing the magnetic circuit, against a tinsel wire to conduct the voice coil, to the frame which is fixed to the damper magnetic circuit And a damper base that adheres,
The elongated damper having the major axis direction and the minor axis direction has a fixing portion fixed to the damper base at the outer peripheral end of the major axis direction,
The damper base having an elongated frame having the major axis direction and the minor axis direction includes a major axis side frame portion to which the fixing portion of the damper is fixed, and minor axis side end portions on both sides of the damper. A short-diameter side frame portion having an inner dimension larger than the length between them and spaced apart,
An intermediate portion of the tinsel wire is fixed to the frame of the damper base;
Electrodynamic type speaker. A jig insertion space for inserting a shaping jig for shaping the tinsel wire is defined between the short-diameter side frame portion of the damper base and the short-diameter side end portion of the elongated damper.
The electrodynamic speaker according to claim 1. The tinsel wire has a curved portion shaped by the shaping jig between one end fixed to the voice coil and the intermediate portion fixed to the frame body of the damper base, The top of the arc that defines the curved portion is shaped so as to be located on the outer side in the minor axis direction than the jig insertion gap,
The electrodynamic speaker according to claim 2. The damper includes a plurality of elongated dampers spaced apart in the direction in which the voice coil vibrates,
The damper base includes a plurality of damper bases that respectively fix the plurality of elongated dampers, and the elongated frame bodies of the plurality of damper bases are overlapped and connected;
The electrodynamic speaker according to any one of claims 1 to 3. A method of manufacturing an elongated electrodynamic speaker having a major axis direction and a minor axis direction,
Forming the elongated damper having the major axis direction and the minor axis direction, and forming a fixing portion at the outer peripheral end of the major axis direction;
Electrically connecting one end of the tinsel wire to the voice coil and fixing one end of the tinsel wire to the bobbin of the voice coil;
Forming a damper base having an elongated frame having the major axis direction and the minor axis direction; a major axis side frame portion to which the fixing portion of the damper is fixed; and minor axis side ends on both sides of the damper Forming a short-diameter side frame portion having an inner dimension larger than the length between the portions and being spaced apart; and
Fixing the frame and the magnetic circuit;
The voice coil to vibrate arranged so as to be able to magnetic gap of the magnetic circuit, is fixed to the inner peripheral end of the bobbin and said damper of said voice coil, and fixed to the fixed portion of the damper on the damper base a step of fixing the damper base for the said frame fixed to the magnetic circuit,
Fixing the intermediate portion of the tinsel wire to the frame of the damper base,
A method for manufacturing an electrodynamic speaker. In the step of fixing the intermediate portion of the tinsel wire to the frame body of the damper base, the tinsel is interposed between the short diameter side frame portion of the damper base and the short diameter side end portion of the damper. Further comprising the step of defining a jig insertion gap for inserting a shaping jig for shaping the line,
A shaping jig is inserted into the jig insertion gap, and the shaping is between the one end fixed to the voice coil of the tinsel wire and the intermediate portion fixed to the frame body of the damper base. Forming a curved portion shaped by a jig;
Shaping the tinsel wire and removing the shaping jig so that the apex of the arc defining the curved portion is located outside the jig insertion gap in the minor axis direction;
Further including
A method for manufacturing an electrodynamic speaker according to claim 5. When the damper includes a plurality of elongated dampers spaced apart in the direction in which the voice coil vibrates, and the damper base includes a plurality of damper bases that respectively fix the plurality of dampers,
Including a step of overlapping and connecting the plurality of damper bases with each of the elongated frames.
A method for manufacturing an electrodynamic speaker according to claim 5 or 6.