JP2005244380A - Electroacoustic transducer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electroacoustic transducer capable of eliminating the need for connection works of conductors configuring a coil and being used for a two-terminal electroacoustic transducer or a three-terminal electroacoustic transducer. <P>SOLUTION: Coil side terminal parts 34, 37, 38, 44 to which ends of conductors 32, 33 are fixed and signal input terminal parts 35, 39, 45 to which an external signal is given are provided on a base 22, and the coil side terminal parts 34, 37, 38, 44 and the signal input terminal parts 35, 39, 45 are respectively and electrically connected in the inside of the base 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a balanced armature type electroacoustic transducer for use in a hearing aid or the like.

  As this type of electroacoustic transducer, for example, one disclosed in Japanese Patent Application Laid-Open No. 58-99099 is known. The electroacoustic transducer disclosed in Japanese Patent Laid-Open No. 58-99099 has a case as a housing and a drive unit portion disposed in the case. The drive unit section includes a plate-shaped member, a coil, a pair of magnets, and a yoke. The plate-shaped member includes a substrate portion, side plate portions extending in parallel from both end portions of the substrate portion, and an armature extending between the side plate portions from the central portion of the substrate portion. The coil is bonded to the inner surface of the side plate portion of the plate-like member. Each of the pair of magnets is fixed to opposing surfaces inside the yoke, and both side surfaces of the yoke and the inner surface of the tip of the side plate portion of the plate-like member are fixed. In a state where the plate-like member and the yoke are fixed, the tip of the armature is inserted between the magnets so as not to contact the pair of magnets. The drive unit portion is fixed to the case by fixing the lower surface of the yoke to the bottom surface of the case.

  The end portion of the coil is connected to a terminal plate as a signal input terminal portion through a hole formed in the case. This terminal board is fixed to the side of the case. In this type of electroacoustic transducer, a very thin copper wire of about 25 μm is usually used as a conductor constituting the coil.

JP 58-99099 A

  However, in the electroacoustic transducer disclosed in Japanese Patent Application Laid-Open No. 58-99099, since the conducting wire constituting the coil is very thin, it is difficult to handle the end portion of the conducting wire. In addition, in the case where a conductor in which a plurality of conductors are wound can be used as a three-terminal electroacoustic transducer or used as a two-terminal electroacoustic transducer, the ends of the conductors are combined. And the connection work cannot be easily performed due to the thinness of the conducting wire. In addition, when selecting whether to manufacture as a two-terminal electroacoustic transducer or as a three-terminal electroacoustic transducer, there is a problem that the line and manufacturing method must be changed and the manufacturing cost is increased. there were.

  The present invention has been made in view of the above-described points, and eliminates the need to connect the conductive wires constituting the coil, and can be used as either a 2-terminal or 3-terminal electroacoustic transducer. An object is to provide an acoustic transducer.

  An electroacoustic transducer according to the present invention is an electroacoustic transducer in which a coil formed by winding a conducting wire, a pair of magnets, and an armature portion are disposed in a housing, and the conducting wire Is wound to form the coil, and the bobbin portion is fixed to the pair of magnets at a predetermined interval, and the bobbin portion has a plurality of ends to which the conductive wires are connected. A coil-side terminal portion is provided, and the conductive wire is constituted by a first conductive wire and a second conductive wire electrically connected to the first conductive wire, and the first conductive wire and the second conductive wire. Each end of the conducting wire is connected to the plurality of coil side terminal portions, respectively.

  An electroacoustic transducer in which a coil configured by winding a conducting wire, a pair of magnets, and an armature portion is disposed in a housing, and the coil is wound around the conducting wire. The bobbin portion is formed and fixed with a predetermined interval between the pair of magnets, and the bobbin portion is provided with a plurality of coil side terminal portions to which end portions of the conducting wires are connected. The conductive wire is constituted by a first conductive wire and a second conductive wire electrically connected to the first conductive wire, and the coil side terminal portion is connected to one end of the first conductive wire. A first terminal portion, a second terminal portion connected to one end of the second conducting wire and the other end of the first conducting wire, a third terminal portion connected to the other end of the second conducting wire, It is characterized by providing.

  Furthermore, the second terminal portion includes two conductors, a first binding portion connected to one end of the second conductor and a second binding portion connected to the other end of the first conductor. It is characterized by including a binding part.

  Further, the first conductive wire and the second conductive wire are wound around the bobbin portion.

  In the electroacoustic transducer according to the present invention, when a coil formed of a plurality of conducting wires such as the first conducting wire and the second conducting wire is connected to the terminal portion, each terminal portion corresponding to the end portion of the conducting wire is provided. What is necessary is just to connect, and a connection work can be performed easily.

  In the electroacoustic transducer according to the present invention, the first terminal connected to one end of the first conducting wire, the second terminal connected to one end of the second conducting wire and the other end of the first conducting wire. And a third terminal portion connected to the other end of the second conducting wire, so that a three-terminal electroacoustic transducer is utilized using the first terminal portion, the second terminal portion, and the third terminal portion. It can also be used, and since the first conductor and the second conductor are connected to the second terminal portion, two-terminal electroacoustic conversion is performed using the first terminal portion and the third terminal portion. It can also be used as a container. In this way, it can be used as an electroacoustic transducer of two types of terminals.

  Furthermore, in the electroacoustic transducer according to the present invention, the second terminal portion includes a first binding portion connected to one end of the second conducting wire and a second binding portion connected to the other end of the first conducting wire. Since the two wire linking portions with the portion are provided, connection of the wire to the wire linking portion is facilitated, and occurrence of disconnection of the wire can be suppressed.

  Moreover, in the electroacoustic transducer according to the present invention, since the first conductor and the second conductor are wound around the bobbin portion, it is possible to form a coil having the second terminal portion as an intermediate tap, This intermediate tap can be used to drive by a push-pull method, and can be used as a magnetic circuit that generates a stronger magnetic force even under low voltage conditions.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of an electroacoustic transducer according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the electroacoustic transducer.

  As shown in FIGS. 1 and 2, the electroacoustic transducer 1 includes a housing 2 and a shield plate 6. The housing 2 includes a top housing 4 and a bottom housing 5. The top housing 4 and the bottom housing 5 are fixed to each other by using laser welding, an adhesive, or the like with the shield plate 6 sandwiched therebetween. The bottom housing 5 has a box shape with an upper surface opened. The upper surface opening is covered with a shield plate 6, and a drive unit unit 10 is formed in a space defined by the bottom housing 5 and the shield plate 6. Is disposed. The drive unit 10 is fixed by laser welding or the like while being suspended from the shield plate 6. Further, the diaphragm unit 3 is fixed to the upper surface of the shield plate 6 by using laser welding, an adhesive, or the like.

  The diaphragm unit 3 on the shield plate 6 is covered with a top housing 4. The top housing 4 has a notch 7 formed in a part thereof, and a space defined by the diaphragm unit 3 and the top housing 4 and a space outside the housing 2 are formed via the notch 7. Communicate. Further, a nose 15 is attached to the front surface of the notch 7 to change the path of sound output from the notch 7. Further, as shown in FIG. 2, a notch 8 is formed on the side of the bottom housing 5.

  The shield plate 6 is a plate made of a metal plate that shields the drive unit 10 from noise. The shield plate 6 is formed with a positioning hole 61 for positioning and fixing the drive unit 10. Furthermore, an opening 62 is formed for communicating a drive pin 41, which will be described later, with a diaphragm unit portion 3 placed on the upper surface of the shield plate 6, and coil side terminal portions 34, 37, 38, 44, which will be described later, are formed. A terminal opening 63 to be included is formed.

  Next, the structure of the drive unit part 10 is demonstrated based on FIGS. 3 is a front view of the bobbin portion 21, FIG. 4 is a perspective view of the same, and FIG. 5 is a perspective view showing a state in which the conducting wires 32 and 33 are wound around FIG. The drive unit unit 10 includes an armature unit 11, a bobbin unit 21, a pair of magnets 31 and 31, and a drive pin 41.

  The armature portion 11 is a plate-like member obtained by bending a metal plate into a substantially E shape in plan view, and includes a substrate portion 12, a pair of side plate portions 13 and 13 extending from both ends of the substrate portion 12, and a substrate portion. 12 and an armature 14 extending between the side plate portions 13 and 13 from the center portion. The shape of the armature part 11 may be an armature part having a substantially U shape in a side view.

  The bobbin portion 21 includes a base portion 22, a coil winding portion 23 around which the conducting wires 32 and 33 are wound, and a magnet positioning portion 24 in which the pair of magnets 31 and 31 are positioned. The coil winding portion 23 and the magnet positioning portion 24 are integrally formed of a resin material, or are integrally fixed with an adhesive or the like. Further, the bobbin portion 21 is formed with a bobbin protrusion 16 and is fitted into a positioning hole 61 formed in the shield plate 6. Thereby, since the bobbin part 21 is positioned with respect to the shield plate 6, the drive unit part 10 is positioned with respect to the shield plate 6.

  The base portion 22 forms a surface that is substantially parallel to the substrate portion 12 of the armature portion 11 of the drive unit portion 10. A hole 25 through which the armature 14 passes is formed at the center of the base 22. Further, the base portion 22 has coil side terminal portions 34, 37, 38, 44 to which end portions of the conducting wires 32, 33 are fixed, and signal input terminal portions 35, 39, 45 to which signals are inputted from the outside. , Provided. The coil side terminal portions 34, 37, 38, 44 and the signal input terminal portions 35, 39, 45 are electrically connected to each other inside the base portion 22, and the base portion is formed when the bobbin portion 21 is integrally formed. The conductive metal plates P, Q, and R constituting the coil side terminal portions 34, 37, 38, and 44 and the signal input terminal portions 35, 39, and 45 are inserted into the portions that constitute the portion 22. Thus, as shown in FIG. 3, the metal plate Q is disposed at the center of the base portion 22, and the metal plates P and R are provided at end portions facing each other across the metal plate Q.

  More specifically, as shown in FIGS. 3 to 5, the signal input terminal portion 35 is electrically connected inside the coil side terminal portion 34 and the base portion 22, and is configured by a metal plate P. Yes. One end of a conducting wire 32 is fixed to the coil side terminal portion 34. Further, the signal input terminal portion 39 is electrically connected inside the coil side terminal portions 37 and 38 and the base portion 22, and is constituted by a metal plate Q. The other end of the conducting wire 32 is fixed to the coil side terminal portion 37, and one end of the conducting wire 33 is fixed to the coil side terminal portion 38. Thus, the coil side terminal portion 37 and the coil side terminal portion 38 are electrically connected inside the base portion 22. Further, the signal input terminal portion 45 is electrically connected inside the coil side terminal portion 44 and the base portion 22, and is configured by a metal plate R. The other end of the conducting wire 33 is fixed.

  As shown in FIGS. 3 and 4, the portion of the base 22 where the signal input terminal portions 35, 39, 45 are provided protrudes toward the ends of the signal input terminal portions 35, 39, 45. 26 is integrally formed. The notch 8 is formed at a position corresponding to the signal input terminals 35, 39, 45 and the protrusion 26 of the bottom housing 5, and when the drive unit 10 is assembled to the bottom housing 5, It fits into a notch 8 formed on the side of the housing 5. In a state where the drive unit portion 10 is fitted to the bottom housing 5, a part of the protrusion 26 and the signal input terminal portions 35, 39, 45 protrude outside the housing 2. An adhesive is applied between the protrusion 26 and the notch 8.

  As shown in FIG. 4, the coil winding portion 23 includes a pair of arm portions 23a and 23b provided at a predetermined distance so as to connect the base portion 22 and the wall portion 29, and the arm portion 23a. , 23b is wound with the conductive wires 32, 33, whereby the coil 36 is formed. In the present embodiment, copper wires having a wire diameter of about 40 μm are used as the conducting wires 32 and 33, and the conducting wires 32 and 33 are wound around the coil winding portion 23 by about 800 times. The ends of the conductive wires 32 and 33 are tangled to the coil side terminal portions 34, 37, 38, and 44, and then arc welded to be fixed and connected to the coil side terminal portions 34, 37, 38, and 44. ing.

  As shown in FIG. 4, the magnet positioning portion 24 is provided so as to extend from the wall portion 29, and the pair of magnets 31, 31 are positioned in the magnet positioning portion 24 with a predetermined interval. For this purpose, gap forming portions 27 and 27 are formed. When the magnets 31, 31 hold the gap forming portions 27, 27, a gap for inserting the tip of the armature 14 is formed between the magnets 31, 31. The magnets 31 and 31 are fixed to the magnet holding part 28 provided outside the magnet positioning part 24 by adhesion or the like. The magnet holding portion 28 is made of a magnetic material made of a material different from that of the magnet positioning portion 24 (bobbin portion 21), and is outside the portion constituting the magnet positioning portion 24 when the bobbin portion 21 is integrally molded or fixed with an adhesive. By being disposed in, the magnet positioning portion 24 (bobbin portion 21) is provided integrally.

  The drive pin 41 includes a diaphragm side plane portion 42 that is substantially parallel to a diaphragm 52, which will be described later, and an armature side plane portion 43 that extends in a direction substantially orthogonal to the diaphragm side plane portion 42 and is fixed to the end of the armature 14. have. The diaphragm side plane portion 42 and the armature side plane portion 43 are integrally formed by bending a metal plate into a substantially L shape.

  The armature portion 11 and the bobbin portion 21 are configured such that the armature 14 is inserted from the hole portion 25 of the base portion 22, passes through the gap formed in the coil 36 and between the magnets 31, 31, and the end portion of the armature 14 is The bobbin portion 21 (magnet positioning portion 24) is assembled in a state protruding from the end portion. The armature part 11 and the bobbin part 21 are assembled by fixing the side plate parts 13 and 13 of the armature part 11 to the magnet holding part 28 by laser welding or the like. In a state where the side plate parts 13 and 13 are fixed to the magnet holding part 28 and the armature part 11 and the bobbin part 21 are assembled, there is a gap between the base part 22 of the bobbin part 21 and the substrate part 12 of the armature part 11. A predetermined gap is formed.

  The armature side plane portion 43 of the drive pin 41 is fixed to the end portion of the armature 14 protruding from the end portion of the bobbin portion 21 (magnet positioning portion 24) by laser welding or the like. The drive pin 41 is integrally formed with a positioning portion (not shown) for fixing to the end portion of the armature 14. The positioning portion has an armature side plane portion 43 fixed to the end portion of the armature 14. After that, the drive pin 41 (armature side plane portion 43) is cut and separated.

  Next, the diaphragm unit section 3 includes a diaphragm frame 51 as a frame, a diaphragm 52 as a substantially flat diaphragm, and a thermoplastic resin film 53 as a diaphragm (diaphragm sheet). Note that this vibration film can be formed of silicone rubber or the like in addition to the resin film.

  The diaphragm 52 is disposed in the diaphragm frame 51. The resin film 53 is fixed to the upper surfaces of the diaphragm frame 51 and the diaphragm 52 and supports the diaphragm 52 with respect to the diaphragm frame 51 so as to vibrate. The resin film 53 is fixed to the diaphragm frame 51 and the diaphragm 52 by applying an adhesive on the upper surfaces of the diaphragm frame 51 and the diaphragm 52 and then heating and pressure bonding. A portion of the resin film 53 between the diaphragm frame 51 and the diaphragm 52 is formed in a substantially arc shape that is convex or concave toward the space defined by the bottom housing 5 and the diaphragm unit portion 3. The vibration width of 52 is secured so as not to inhibit the vibration.

  The diaphragm 52 has a substantially rectangular shape with a circular portion in part in a plan view, and has a convex portion 54 for ensuring rigidity. A hole portion 55 and a driving pin fixing hole portion 56 for fixing the driving pin are formed in a flat portion of the diaphragm 52 to which the resin film 53 is fixed. The drive pin fixing hole portion 56 is formed at a position corresponding to the diaphragm side plane portion 42 of the drive pin 41, and the hole portion 55 and the drive pin fixing hole portion 56 are predetermined in the long side direction of the diaphragm 52. They are formed at intervals.

  The hole portion 55 formed in the flat portion where the resin film 53 of the diaphragm 52 is fixed is covered with the resin film 53, and a vent hole 57 is formed in a portion corresponding to the hole portion 55 of the resin film 53. ing. The vent hole 57 communicates with a space outside the housing 2 and is defined by the diaphragm unit portion 3 and the top housing 4, and is defined by the bottom housing 5, the shield plate 6, and the diaphragm unit portion 3. For adjusting the pressure difference between the two chambers formed by sandwiching the diaphragm unit 3 (the diaphragm 52 and the resin film 53), and formed by irradiating a laser beam. Is done. In the present embodiment, the diameter of the vent hole 57 is set to about 30 μm.

  The drive pin fixing hole 56 is also covered with the resin film 53 in the state where the resin film 53 is fixed to the diaphragm 52, like the hole 55, but the drive pin fixing hole of the resin film 53 is also covered. The portion covering the portion 56 is removed larger than the outer diameter of the drive pin fixing hole portion 56 by irradiating the laser beam.

  When the bottom housing 5 and the shield plate 6 are covered with the shield plate 6 to which the diaphragm unit portion 3 is fixed in a state where the drive unit portion 10 is disposed in the upper surface opening of the bottom housing 5, laser welding and It is fixed using an adhesive or the like. Since the drive pin fixing hole 56 is formed at a position corresponding to the diaphragm side plane portion 42 of the diaphragm 52, the bottom housing 5, the shield plate 6, and the diaphragm unit portion 3 (diaphragm frame 51) are fixed. In the state, the diaphragm side flat surface portion 42 is positioned below the drive pin fixing hole portion 56. In the state where the diaphragm side flat surface portion 42 is positioned below the drive pin fixing hole portion 56, the diaphragm side flat surface portion 42 and the drive pin fixing portion are fixed by applying (injecting) an adhesive from the drive pin fixing hole portion 56. The hole 56 is fixed.

  Next, FIG. 6 is a circuit diagram showing a push-pull method for driving the electroacoustic transducer according to the embodiment of the present invention. The driving of the coil 36 by the push-pull method using the intermediate tap will be described with reference to FIG. When a circuit as shown in FIG. 6 is configured and a drive signal for the coil 36 is input to the metal plates P, Q, and R, a push-pull circuit using the metal plate Q (signal input terminal portion 39) as an intermediate tap is formed. be able to. Thus, the drive by a push pull system can be performed and it can be used as a magnetic circuit which generates a stronger magnetic force even under a low voltage condition.

  As described above, in the electroacoustic transducer 1 according to the present embodiment, when connecting the coil 36 formed by the plurality of conducting wires 32 and 33 to the coil side terminal portions 34, 37, 38 and 44, the conducting wire 32. , 33 can be connected to the coil side terminal portions 34, 37, 38, 44 corresponding to the ends of the wires 33 by being fixed by arc welding or the like and connected easily.

  Further, in the electroacoustic transducer 1 according to the present invention, the signal input terminal portion 35 that is the first terminal portion connected to one end of the conducting wire 32, the first end of the conducting wire 33, and the other end of the conducting wire 32 are connected. Since the terminal portion 39 for signal input which is a two-terminal portion and the terminal portion 45 for signal input which is a third terminal portion connected to the other end of the conducting wire 33 are provided, the terminal portions 35, 39, 45 can be used as a three-terminal electroacoustic transducer, and since the conducting wire 32 and the conducting wire 33 are connected to the signal input terminal portion 39, the signal input terminal portions 35 and 45 are connected. Can be used as a two-terminal electroacoustic transducer. In this way, it can be used as an electroacoustic transducer of two types of terminals.

  Furthermore, in the electroacoustic transducer 1 according to the present invention, the signal input terminal portion 39 that is the second terminal portion includes the coil side terminal portion 37 that is the first binding portion connected to one end of the conductive wire 33, and the conductive wire. Since it has two conducting wire binding parts with coil side terminal part 38 which is the 2nd binding part connected with the other end of 32, connection of conducting wires 32 and 33 to a conducting wire binding part becomes easy. Moreover, it is possible to suppress the disconnection of the conducting wires 32 and 33.

  Further, in the electroacoustic transducer 1 according to the present invention, since the conducting wires 32 and 33 are wound around the bobbin portion 21, it is possible to form the coil 36 having the signal input terminal portion 39 as an intermediate tap, This intermediate tap can be used to drive by a push-pull method, and can be used as a magnetic circuit that generates a stronger magnetic force even under low voltage conditions.

It is a perspective view which shows the external appearance of the whole electroacoustic transducer which concerns on embodiment of this invention. It is a disassembled perspective view which shows the structure of the electroacoustic transducer which concerns on embodiment of this invention. It is a front view which shows the structure of the bobbin part contained in the electroacoustic transducer which concerns on embodiment of this invention. It is a perspective view which shows the structure of the bobbin part contained in the electroacoustic transducer which concerns on embodiment of this invention. It is a perspective view which shows the structure of the state which wound the conducting wire around the bobbin part contained in the electroacoustic transducer which concerns on embodiment of this invention. It is a circuit diagram which shows the push pull system which drives the electroacoustic transducer which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electroacoustic transducer 2 Housing 3 Diaphragm unit part 4 Top housing 5 Bottom housing 6 Shield plate 8 Notch part 10 Drive unit part 11 Armature part 12 Substrate part 13 Side plate part 14 Armature 15 Nose 16 Bobbin protrusion 21 Bobbin part 22 Base part 23 Coil Winding portion 24 Magnet positioning portion 25 Hole portion 28 Magnet holding portion 31 Magnet 32, 33 Conductor wires 34, 44 Coil side terminal portion 35, 45 Signal input terminal portion 36 Coil 37, 38 Coil side terminal portion 39 Signal input terminal portion 41 Drive Pin 51 Diaphragm Frame 52 Diaphragm 53 Resin Film 61 Positioning Hole 62 Opening 63 Terminal Opening

Claims (4)

An electroacoustic transducer in which a coil configured by winding a conductive wire, a pair of magnets, and an armature portion are disposed in a housing,
The conductive wire is wound to form the coil, and the pair of magnets has a bobbin portion fixed at a predetermined interval,
The bobbin portion is provided with a plurality of coil side terminal portions to which end portions of the conducting wires are connected,
The conducting wire is constituted by a first conducting wire and a second conducting wire electrically connected to the first conducting wire,
The electroacoustic transducer characterized in that each end portion of the first conducting wire and the second conducting wire is connected to the plurality of coil side terminal portions, respectively.
An electroacoustic transducer in which a coil configured by winding a conductive wire, a pair of magnets, and an armature portion are disposed in a housing,
The conductive wire is wound to form the coil, and the pair of magnets has a bobbin portion fixed at a predetermined interval,
The bobbin portion is provided with a plurality of coil side terminal portions to which end portions of the conducting wires are connected,
The conducting wire is constituted by a first conducting wire and a second conducting wire electrically connected to the first conducting wire,
The coil side terminal portion includes a first terminal portion connected to one end of the first conductive wire, a second terminal portion connected to one end of the second conductive wire and the other end of the first conductive wire, An electroacoustic transducer comprising: a third terminal portion connected to the other end of the second conducting wire.
The second terminal portion includes a first binding portion connected to one end of the second conducting wire,
The electroacoustic transducer according to claim 2, further comprising two conductive wire binding portions, a second binding portion connected to the other end of the first conductive wire.
The electroacoustic transducer according to any one of claims 1 to 3, wherein the first conductive wire and the second conductive wire are wound around the bobbin portion.

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