JP2016072914A - Electrodynamic loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrodynamic loudspeaker the acoustic characteristic deterioration of which is suppressed and in which erroneous wiring is hard to occur.SOLUTION: A loudspeaker 10 includes a conical diaphragm 12, a voice coil, an edge 24, a damper and a frame 14. The voice coil includes a bobbin which is connected to an inner peripheral end of the diaphragm 12, and three or more coils which are wound around an outer circumference of the bobbin. Two extension lines of each of the coils are connected from paired relay points which are formed through the diaphragm 12, to a terminal via a lead wire. Among the paired relay points provided in the diaphragm 12, pairs 40 and 44 of relay points corresponding to one coil are disposed to be located on one circumference 13a that is drawn around an axial center CL on the diaphragm 12, and pairs 42 and 46 of relay points corresponding to the other coil are disposed so as to be located on a different coaxial circumference 13b. All the lead wires connecting the terminal and the relay points are formed in the same shape.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electrodynamic speaker, and more particularly, to an electrodynamic speaker including a voice coil including a plurality of coils.

  2. Description of the Related Art Conventionally, for example, Patent Document 1 discloses a voice coil that processes an audio signal in front of a diaphragm in a boil coil speaker that includes a bobbin having a multi-layer voice coil formed on a speaker body and a diaphragm connected to the bobbin. A signal processing circuit board is arranged, and a plurality of output terminals for outputting to a multi-layer voice coil are arranged at the peripheral edge of the audio signal processing circuit board.

  Patent Document 2 discloses a configuration in which a voice coil lead wire and a lead wire connected to a speaker terminal are connected to a speaker via a relay point provided on a diaphragm. This Patent Document 2 describes a structure in which a small metal fitting called an eyelet is fixed to a relay point of a diaphragm, and a lead wire and a lead wire of a voice coil are soldered and connected to the small metal fitting.

JP 2011-223289 A Japanese Utility Model Publication 4-13911

  By the way, an electrodynamic type digital speaker provided with a voice coil including a plurality of coils is known. For example, in the case of a four-input type digital speaker as shown in FIG. 5, relay points 52 a to 52 h for connecting eight lead lines extending from four coils constituting the voice coil to the speaker terminal are provided on the diaphragm 54. In order to maintain the mass balance of the vibration system in the speaker, it is preferable to arrange them as evenly as possible along the same circumference. Here, of the eight relay points, the relay points 52a and 52b correspond to the two lead lines extending from one coil, and similarly, the two relay points 52c and 52d, 52e and 52f which are adjacent in the circumferential direction. , And 52g and 52h respectively correspond to pairs of leader lines extending from the other three coils.

  However, when a large number of relay points 52a to 52h are arranged on the same circumference on the diaphragm 54, a through hole is formed at the relay point or the diaphragm is crushed by a tool when fastening the eyelet. As a result, the strength of the diaphragm 54 becomes weak at the same distance from the axis CL. Then, when the diaphragm 54 vibrates and generates a sound wave, it becomes a vibration node, and vibration of an unnecessary mode is generated. As a result, the acoustic characteristics may be deteriorated.

  In addition, since the distance between pairs of relay points adjacent in the circumferential direction is close, when connecting the relay point to the terminal with the lead wire on the convex surface side of the diaphragm, the lead wire is connected by displacing the relay point to be paired Incorrect wiring is likely to occur, and the speaker may not be designed as intended.

  An object of the present invention is to provide an electrodynamic speaker in which deterioration of acoustic characteristics is suppressed and miswiring is unlikely to occur.

  An electrodynamic speaker according to the present invention includes a cone-shaped diaphragm, a voice coil connected to the inner peripheral end of the diaphragm, an edge that supports the outer peripheral end of the diaphragm, and an inner peripheral end side of the diaphragm. An electrodynamic speaker comprising: a damper to be supported; and an edge and each outer peripheral end of the damper; and a frame that supports a magnet that forms a magnetic gap in which the voice coil is housed. A bobbin connected to the inner peripheral end and at least three or more coils wound around the outer periphery of the bobbin, and each two lead wire pairs drawn out from each coil are formed through the diaphragm. A pair of relay points corresponding to at least one coil among the pair of relay points provided to the terminals provided on the convex surface side of the diaphragm from the relay points forming a pair are connected via lead wires. Is A relay point pair corresponding to another coil is arranged on a circle-shaped diaphragm so as to be on one circumference drawn around its axis, and is a coaxial circle different from one circumference. The lead wire that is arranged on the circumference and connects the terminal and the relay point is formed in the same shape regardless of whether it is connected to the relay point corresponding to one coil or the relay point corresponding to another coil. It is what has been.

  In the electrodynamic loudspeaker according to the present invention, the voice coil includes an even number of coils, and a pair of relay points provided at positions facing each other in the radial direction of the diaphragm among the relay points corresponding to each coil are: Another relay point pair that is arranged on the same circumference and that is adjacent to the diaphragm in the circumferential direction may be arranged on a different circumference.

  In addition, in the electrodynamic speaker according to the present invention, the attachment position of the terminal with respect to the frame may be set so that the lead wires connected to each relay point and the terminal have the same shape.

  According to the electrodynamic loudspeaker of the present invention, among the relay point pairs provided on the diaphragm, the relay point pair corresponding to at least one coil is drawn on the cone-shaped diaphragm with its axis as the center. The relay point pairs corresponding to the other coils are arranged on a coaxial circumference different from the one circumference. That is, it is configured so that the radial distances of the portions where the strength of the diaphragm is reduced due to the formation of the relay points are not uniform. As a result, it is difficult to generate an unnecessary mode vibration in which the position where the relay point is formed becomes a node during vibration of the diaphragm, and deterioration of acoustic characteristics in the electrodynamic speaker can be suppressed.

  According to the electrodynamic speaker of the present invention, the lead wire connecting the terminal and the relay point is connected to either the relay point corresponding to one coil or the relay point corresponding to another coil. Since the thing is also formed in the same shape, the load which acts on a diaphragm with a lead wire at the time of a vibration can be made constant. Therefore, this can also contribute to the improvement of the acoustic characteristics of the speaker. In addition, since the lead wires can be formed in the same shape in advance, the lead wires having different shapes are not mistakenly connected during the wiring operation, and the wiring operation can be performed reliably and easily. There are also advantages.

  Further, in the electrodynamic speaker according to the present invention, the voice coil includes an even number of coils, and the relay point provided at a position facing the radial direction of the diaphragm among the relay points corresponding to each coil. If the configuration is such that the pair of relays are arranged on the same circumference and the pair of other relay points adjacent to the diaphragm in the circumferential direction are arranged on different circumferences, for example, 4 inputs or 6 In an even-numbered speaker such as an input or 8-input speaker, it is possible to suppress the deterioration of acoustic characteristics as described above and facilitate wiring work.

  Furthermore, in the electrodynamic speaker according to the present invention, if the attachment position of the terminal with respect to the frame is set so that the lead wire connected to each relay point and the terminal has the same shape, the lead wire formed in advance The relay point and the terminal can be connected without changing the same shape.

It is a top view which shows the electrodynamic type speaker which is one Embodiment of this invention. It is a perspective view of the speaker of FIG. (A) is a side view and a partially enlarged view of the speaker of FIG. 1, and (b) is a side view of the speaker at a position shifted by 90 degrees from (a). It is the same front view as FIG. 1 which shows another example of an electrodynamic type speaker. It is a front view which shows an example of the conventional electrodynamic type speaker.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. In this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating the understanding of the present invention, and can be appropriately changed according to the application, purpose, specification, and the like. In addition, when a plurality of embodiments and modifications are included in the following, it is assumed from the beginning that these characteristic portions are used in appropriate combinations.

  FIG. 1 is a plan view showing an electrodynamic speaker (hereinafter referred to as “speaker” as appropriate) 10, and FIG. 2 is a perspective view of the speaker 10 of FIG. 1. 1 and 2, the vibration direction of the diaphragm 12 is a Z-axis direction, a plane perpendicular to the Z-axis direction is shown as an XY plane, and the axis of the center hole of the diaphragm is shown as CL.

  The speaker 10 is a substantially disk-shaped electroacoustic transducer having a cone-shaped diaphragm 12. The speaker 10 includes a frame 14 that forms an outer shape. In addition, the speaker 10 includes a voice coil 18 including a bobbin connected to the inner peripheral end of the center hole 16 of the diaphragm 12 and a coil wound around the inner periphery of the frame 14, a magnetic circuit 20, a voice It includes a magnetic gap 22 in which the coil of the coil is disposed. Further, an edge 24 provided at the cone-shaped outer peripheral end of the diaphragm 12 and a damper 26 provided between the bobbin of the voice coil 18 and the frame 14 are provided. First, components other than the diaphragm 12 will be described first.

  The frame 14 is a speaker housing that supports the outer peripheral end of the diaphragm 12 via an edge 24 and supports a connection portion with a bobbin at the inner peripheral end of the diaphragm 12 via a damper 26. As the frame 14, 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. Instead of this, a metal plate formed into a predetermined shape may be used. When using a metal plate, it is preferable to use a non-magnetic plate such as an aluminum plate, but a steel plate such as SPCC may be used. The size of the frame 14 defines the size of the speaker 10. For example, the diameter of the edge support portion is about 100 mm in a plane size. This is an example and can be changed as appropriate according to the specifications of the speaker 10.

  The voice coil 18 includes a bobbin formed in an annular shape and a plurality of coils wound on the annular outer peripheral surface of the bobbin. The bobbin is a thin insulating cylindrical member formed in an annular shape. As the thin insulator, a metal foil or a resin film having appropriate strength and heat resistance can be used. Aluminum foil can be used as the metal foil. As the resin film, a polyimide (PI) film, polyetherimide with glass (TIL), or the like can be used. Each coil is formed by winding a conductive wire with insulation coating along the annular outer peripheral surface of the bobbin with a predetermined number of 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 annular perimeter of the voice coil 18 and the number of turns of the coil define the sound pressure of the speaker 10 and are appropriately changed according to the specifications of the speaker 10.

The magnetic circuit 20 includes an annular magnet 28. The magnetic circuit 20 is fixed to the base portion 14 a of the frame 14. A magnetic gap 22 is formed on the inner peripheral side of the magnet 28, and the voice coil 18 is disposed in the magnetic gap 22. As the magnet material, an Alnico magnet that is an alloy of aluminum nickel cobalt and a rare earth magnet containing neodymium can be used.
The magnetic gap 22 is an annular gap space formed between the magnet 28 in the magnetic circuit 20 and the voice coil 18 formed of a bobbin around which the coil is wound. In the present embodiment, an external magnetic type magnetic circuit in which the magnet 28 is disposed outside the voice coil 18 is illustrated. However, the present invention is not limited to this, and the magnet is disposed inside the bobbin of the voice coil 18. An internal magnet type magnetic circuit may be used.

The edge 24 is disposed along the outer peripheral end of the diaphragm 12 and has a vibration allowing portion curved in an arc shape and a flange portion provided continuously to the outer peripheral edge thereof. The inner peripheral end of the vibration allowing portion of the edge 24 is fixed to the outer peripheral end of the diaphragm 12 by a fixing means such as adhesion. The diaphragm 12 is supported by the vibration allowing portion of the edge 24 so as to freely vibrate. On the other hand, the flange portion of the edge 24 is fixed to the annular portion 14b of the frame 14 by fixing means such as adhesion and screwing.
As the edge 24, a thermoplastic elastomer resin that is molded into a predetermined shape having flexibility can be used. As the thermoplastic elastomer resin, polyurethane, polyolefin, polyamide, polyethylene, or polystyrene can be used. Further, as the material of the edge 24, rubber, foamed rubber, coated cloth or the like may be used.
Note that the diaphragm 12 and the edge 24 can be used by individually connecting them with an adhesive, but instead, the diaphragm 12 can be formed by a two-color molding method in which different resins are integrally molded. And the edge 24 may be integrated.

  The damper 26 has an annular shape and is used for disposing the voice coil 18 at a predetermined position of the magnetic gap 22. The annular inner peripheral end is fixed to the inner peripheral end of the diaphragm 12 or the vicinity thereof. The outer peripheral end is fixedly supported by the frame 14. As the damper 26, a material obtained by molding a flexible material into 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.

  As described above, in the frame 14, the magnetic circuit 20 is disposed on the base portion 14a, and the edge 24 is supported on the annular portion 14b on the upper portion. The frame 14 is provided with a plurality of connecting portions 14c that connect the base portion 14a and the annular portion 14b. In the present embodiment, four connecting portions 14 c are provided at a 90-degree pitch in the circumferential direction around the axis CL of the diaphragm 12. And the window part 30 is formed between each connection part 14c.

  The connecting portion 14c of the frame 14 is provided with a terminal mounting portion 15 that is bent so as to be horizontal to the XY plane. A terminal plate (terminal) 32 having two terminals to which an audio signal from an audio signal processing circuit (not shown) is input is attached to the terminal attachment portion 15. That is, the terminal plate 32 is provided on the convex surface side of the diaphragm 12. And the lead wire 34 connected to the lead wire for inputting an audio | voice signal to each coil of the voice coil 18 mentioned later is connected to the terminal board 32. FIG. Two lead wires 34 are connected to each terminal board 32. In the present embodiment, for example, a tinsel wire is preferably used as the lead wire 34. However, the present invention is not limited to this, and a copper wire, a metal foil, or the like may be used as the lead wire 34.

  In addition, the attachment position of the terminal board 32 in the connection part 14c of the flame | frame 14 is two connection parts 14c located facing the radial direction, and another two connection parts located facing the radial direction orthogonal to this. 14c. Details thereof will be described later with reference to FIG.

As shown in FIG. 1, the diaphragm 12 is formed in a cone shape having a center hole 16. The center hole 16 of the diaphragm 12 is covered with a dome-shaped dust cap (not shown), thereby preventing dust and the like from entering the magnetic circuit 20.
Such a diaphragm 12 can be obtained by using a product obtained by forming a paper made from a pulp material into a cone shape, or using a thermoplastic resin formed 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. Molding can be used as a molding method for papermaking. As a molding method for the thermoplastic resin, vacuum molding or press molding from a sheet-like shape can be used. Also, injection molding using a predetermined mold can be used.

  Two lead lines (not shown) connected to each coil of the voice coil 18 are drawn out from the inner peripheral end of the diaphragm 12. Each of the two lead lines corresponding to each coil is formed to extend radially outward from the inner peripheral end of the diaphragm 12. Each lead line extends to the concave surface or inside of the diaphragm 12 and is connected to a relay point described later.

  The diaphragm 12 is provided with four relay point pairs 40, 42, 44, 46 as shown in FIG. Each relay point pair 40, 42, 44, 46 includes two relay points 40a, 40b, 42a, 42b, 44a, 44b, and 44a, 44b, respectively. In this embodiment, a four-input speaker is illustrated, and the voice coil 18 includes four coils. Accordingly, each relay point pair 40, 42, 44, 46 corresponds to four coils included in the voice coil 18. That is, the relay point pair 40 is connected to two lead lines drawn from one coil. Similarly, the other relay point pairs 42, 44, 46 are respectively connected to the two lead lines drawn from the other three coils.

  At each relay point 40a-46b, the lead wire of the coil of the voice coil 18 and the other end of the lead wire 34 having one end connected to the terminal plate 32 are connected and fixed by, for example, soldering. Each relay point 40a-46b is formed with a through hole in the diaphragm 12, and a small metal fitting called an eyelet inserted and fixed in the through hole is fixed, and then the other end of the lead wire 34 is inserted into the eyelet. In this state, solder and fix. The eyelet fixed to the diaphragm 12 in this way is electrically connected to the lead line drawn from each coil on or inside the concave surface of the diaphragm 12.

  In the present embodiment, an example in which each relay point 40a-46b includes an eyelet has been described. However, the present invention is not limited to this. For example, the lead wire 34 is inserted into a through-hole formed in the diaphragm 12. The other end may be directly connected to form a relay point, or when the diaphragm 12 is made of a conductive material, the relay point is formed using a connecting member made of an insulating resin, for example. May be.

  In the present embodiment, among the four relay point pairs 40, 42, 44, 46, the relay points 40a, 40b and 44a, 44b constituting the relay point pairs 40, 44 that face each other in the radial direction along the X direction are provided. The diaphragm 12 is arranged on a circumference 13a drawn around the axis CL of the diaphragm 12. On the other hand, each of the relay points 42 and 44 constituting the relay point pair 42 and 44 facing in the radial direction along the Y direction is a circumference drawn around the axis CL of the diaphragm 12, and the circle It arrange | positions so that it may exist on the circumference 13b from which diameter is different from the circumference 13a.

  More specifically, in the speaker 10 of the present embodiment, each two relay points constituting the relay point pairs adjacent in the circumferential direction are arranged on the diaphragm 12 along the circumferences having different diameters. By arranging the relay points 40a-46b in this manner, the radial distances of the portions where the strength of the diaphragm 12 is reduced are not aligned. As a result, it is difficult for vibration in an unnecessary mode in which the formation position of the relay point becomes a node when the diaphragm 12 vibrates, and deterioration of acoustic characteristics in the electrodynamic speaker can be suppressed.

  Next, with reference to FIG. 3, the shape of the lead wire 34 connected to each relay point 40a-46b and the attachment position of the terminal board 32 are demonstrated. 3A is a side view and a partially enlarged view of the speaker 10 of FIG. 1 as viewed from the X direction, and FIG. 3B is a side view of the speaker 10 as viewed from the Y direction 90 degrees away from FIG. is there.

  Referring to FIGS. 3A and 3B, all of the lead wires 34 connected to each relay point 40a-46b and the terminal plate 32 included in each relay point pair 40-46 are formed in the same shape. Specifically, the lead wire 34 is formed in a substantially L shape, and extends in a radial direction substantially orthogonal to the axis CL of the diaphragm 12 as shown in a partially enlarged view of FIG. It includes a radial portion 34a and an axial portion 34b extending in a direction substantially along the axis CL. Such a substantially L-shaped lead wire 34 is formed by bending a conducting wire cut into a predetermined length using, for example, a round bar-shaped forming die. One end of the lead wire 34 is connected and fixed to the terminal plate 32 by, for example, screwing, and the other end is connected and fixed to each relay point 40a-46b by, for example, soldering.

  In order to make the shape of the lead wire 34 connected to each relay point 40a-46b the same as described above, the position of the terminal mounting portion 15 of the connecting portion 14c in the frame 14 of the speaker 10 is set to the relay point pair 42, 46. The relay point pairs 40 and 44 are different. Specifically, the relay points 42a, 42b, 46a, 46b constituting the relay point pairs 42, 46 are different from the relay points 40a, 40b, 44a, 44b constituting the other relay point pairs 40, 44 in FIG. As shown in FIG. 4, the position is located on the outer side in the radial direction with respect to the axis CL, and the concave surface of the diaphragm 12 is inclined, so that it is shifted to the front side (that is, the outer peripheral end side of the diaphragm 12) in the Z direction. In order to absorb such misalignment in the XY plane and misalignment in the Z direction and enable wiring with the lead wire 34 having the same shape, as shown in FIG. The position of the terminal mounting portion 15a of the connecting portion 14c to which the terminal plate 32 corresponding to is attached is radially outer than the terminal mounting portion 15b of the connecting portion 14c shown in FIG. The position is set to be shifted to the end side. Accordingly, the relay points 40a-46b of the relay points 40-46 and the terminal plate 32 can be connected without changing the shape of the lead wire 34 formed in the same shape in advance.

  As described above, in this embodiment, all the lead wires 34 that connect each relay point 40a-46 of the diaphragm 12 and the terminal plate 32 are formed in the same shape. Therefore, the load acting on the diaphragm 12 by the lead wire 34 during vibration can be made constant. As a result, this can also contribute to the improvement of the acoustic characteristics of the electrodynamic speaker. In addition, since the lead wires 34 can be formed in the same shape in advance, the lead wires 34 having different shapes are not mistakenly connected during the wiring operation, and the wiring operation can be performed reliably and easily. There is also an advantage that can be made.

  FIG. 4 is a front view similar to FIG. 1, showing another example of the electrodynamic speaker. This speaker 11 is a 6-input speaker and includes six relay point pairs 40, 42, 44, 46, 48 and 50, and each relay point pair 40-50 is constituted by two relay points 40a-50b. Yes. In this speaker 11, the relay points 40a, 40b, 46a, 46b constituting the relay point pairs 40, 46 opposed in the radial direction are arranged so as to be on the circumference 13a located on the innermost diameter side. The relay points 42a, 42b, 48a, 48b constituting the relay point pairs 42, 48 facing in the radial direction at positions adjacent to each other in the circumferential direction are on another circumference 13b having a larger diameter than the circumference 13a. Further, the relay points 44a, 44b, 50a, 50b constituting the relay point pairs 44, 50 that are radially opposed to each other at positions adjacent to each other in the circumferential direction are arranged on the circumference 13c having the largest diameter. Has been. Such a speaker 11 can provide the same operational effects as the speaker 10 described above.

In addition, this invention is not limited to embodiment mentioned above and its modification, A various improvement and change are possible within the matter described in the claim of this application, and its equivalent range.
For example, although the speakers 10 and 11 have been described with respect to speakers having an even number of inputs of 4 inputs and 6 inputs, the present invention is not limited to this and may be applied to speakers having an odd number of inputs of 3 or more.

  10, 11 Speaker, 12 Diaphragm, 13a, 13b, 13c Circumference, 14 Frame, 14a Base, 14b Annular part, 14c Connection part, 15, 15a, 15b Terminal mounting part, 16 Center hole, 18 Voice coil, 20 Magnetic Circuit, 22 Magnetic gap, 24 Edge, 26 Damper, 28 Magnet, 30 Window part, 32 Terminal plate, 34 Lead wire, 34a Radial part, 34b Axial part, 40, 42, 44, 46, 48, 50, 52 Relay point pair, 40a, 40b, 44a, 44b, 46a, 46b, 48a, 48b, 50a, 50b, 52a, 52b Relay point, CL axis.

Claims (3)

A cone-shaped diaphragm and a voice coil connected to the inner periphery of the diaphragm;
An edge supporting the outer peripheral edge of the diaphragm;
A damper that supports the inner peripheral end of the diaphragm;
An electrodynamic speaker comprising: the edge and each outer peripheral end of the damper; and a frame that supports a magnet that forms a magnetic gap in which the voice coil is housed,
The voice coil includes a bobbin connected to an inner peripheral end of the diaphragm, and at least three or more coils wound around the outer periphery of the bobbin;
Each of the two lead wire pairs drawn out from each coil is connected via a lead wire to a terminal provided on the convex surface side of the diaphragm from a relay point forming a pair formed through the diaphragm. And
Of the pairs of relay points provided on the diaphragm, the pair of relay points corresponding to at least one coil is on one circumference drawn around the axis on the cone-shaped diaphragm. A pair of relay points corresponding to different coils are arranged on a coaxial circumference different from the one circumference;
The lead wire connecting the terminal and the relay point is formed in the same shape as the lead wire connected to either the relay point corresponding to the one coil and the relay point corresponding to the other coil. Electric speaker.   The voice coil includes an even number of coils, and the pairs of relay points provided at positions facing the radial direction of the diaphragm among the relay points corresponding to the coils are on the same circumference. The electrodynamic loudspeaker according to claim 1, wherein the pair of relay points adjacent to the diaphragm in the circumferential direction are arranged on different circumferences.   The electrodynamic speaker according to claim 1 or 2, wherein a mounting position of the terminal with respect to the frame is set so that the lead wires connected to the relay points and the terminal have the same shape.