JP4318307B2 - Electromagnetic transducer for sound - Google Patents

Description

  The present invention not only aims to reduce the manufacturing cost by easily insulating and locking the lead wire as the end of the coil, but also accurately positioning the coil with respect to the yoke or the like to improve the performance of the acoustic electromagnetic The conversion device is particularly suitable for an acoustic electromagnetic conversion device using a magnetostrictive element.

  Conventionally known is an acoustic electromagnetic transducer that generates sound by vibrating a diaphragm by expansion and contraction of a magnetostrictive element. Conventional acoustic electromagnetic transducers, for example, have a magnetostrictive element inserted into a bobbin around which a wire is wound. In addition, a yoke made of a magnetic material is disposed adjacent to the bobbin, and a bias magnet is disposed around the magnetostrictive element.

  In addition, when a current is applied to the coil of the acoustic electromagnetic transducer, a magnetic field is generated in the coil corresponding to the current, and the magnetostriction amount of the magnetostrictive element changes accordingly, and the magnetostrictive element expands and contracts. Become. As a result, the expansion and contraction of the magnetostrictive element is transmitted to the external diaphragm so that the external diaphragm vibrates.

  In the conventional acoustic electromagnetic transducer, as shown in FIG. 6, a protective material 116 such as an insulating tube or tape is used to insulate or lock the lead wires 114A and 114B of the coil 114 wound around the bobbin 112. An insulating tube or the like has been used so as to be attached around the lead wires 114A and 114B.

On the other hand, the following patent document is known as a related document. However, Patent Document 1 and the like have a structure in which a notch is provided in a flange portion of a bobbin, and a lead wire as an end portion of a coil is wired in the notch. It was only disclosed. Furthermore, Patent Document 4 merely discloses a structure in which the yoke is extended to form the substrate mounting portion.
JP 2002-80172 A Utility Kaihei 7-36409 JP 2003-297626 A Japanese Patent Publication No. 6-87442

  However, the amount of expansion and contraction of the magnetostrictive element varies significantly depending on the positional relationship among the coil, the bias magnet and the yoke, the shape of the yoke, and the like. For this reason, it is preferable that the shape of the coil, bias magnet, and yoke be axisymmetric, and by arranging these members coaxially, the expansion / contraction amount of the magnetostrictive element is stabilized and the performance is improved. However, it is difficult to accurately position and coaxially arrange the conventional acoustic electromagnetic transducer.

On the other hand, in order to solve the problems caused by the coil lead wires coming into contact with metal members such as yokes, insulation tubes and tapes are used to insulate and lock the lead wires. Therefore, it was difficult to reduce the manufacturing cost.
In consideration of the above facts, the present invention not only aims at reducing the manufacturing cost by simply insulating and locking the lead wire which is the end of the coil, but also by accurately positioning the coil with respect to the yoke or the like. An object of the present invention is to provide an acoustic electromagnetic transducer that can be enhanced.

An acoustic electromagnetic transducer according to claim 1 is provided in contact with one end side of a bobbin, a coil for generating a magnetic field, a bobbin on which a wire forming the coil is wound, a magnetostrictive element disposed at the center of the bobbin, and An acoustic electromagnetic transducer having a yoke, a case main body and a case lid part that contain and hold these members, and a terminal plate that is fitted to the case lid part and has a terminal electrode,
A guide part longer than the dimension obtained by adding the thickness of the yoke and the case lid part is provided on the collar part forming one end side of the bobbin,
The yoke and the case lid part are inserted through the guide part while being fitted, and the lead wire of the coil is guided by the guide part and drawn out from the case lid part and guided to the terminal plate.

The operation of the acoustic electromagnetic transducer according to claim 1 will be described below.
According to the acoustic electromagnetic transducer of this claim, the wire forming the coil for generating the magnetic field is wound around the bobbin, the magnetostrictive element is arranged at the center of the bobbin, and is in contact with one end of the bobbin. The yoke is arranged. The case body and the case lid are built in and held, and a terminal plate having terminal electrodes is fitted into the case lid.

  In addition, a guide part longer than the combined dimension of the yoke and the case cover part is provided on the flange part forming one end side of the bobbin, and the yoke and the case cover part are penetrated while the guide part is fitted. Along with this structure, the lead wire of the coil is guided by this guide part, drawn out of the case cover part, and led to the terminal board.

  That is, a guide part is formed on one end side of the bobbin that faces the yoke, and a lead wire of the coil is arranged along the guide part, so that the conductive metal material such as the yoke and the case cover part and this lead The wire can be isolated and insulated easily and reliably, and the lead wire can be locked, so that it is not necessary to use the conventionally used insulating tube or tape.

  In addition, since the guide portion formed on the bobbin and the yoke or the case lid portion are fitted as described above, accurate positioning of the coil in which the wire is wound around the bobbin with respect to the yoke and the case lid portion. Became possible. As a result, the coil can be installed so that the center of the coil is accurately positioned at the center of the opposing surface of the yoke, and when a current is applied to the coil, the magnetic field generated by the coil is uniformly and stably applied to the magnetostrictive element. The amount of expansion and contraction of the magnetostrictive element is stabilized.

  As described above, according to the electromagnetic conversion device for sound according to the present invention, the structure is simplified and the assemblability is improved and the manufacturing cost is improved as the lead wire as the end of the coil is easily insulated and locked. As a result, the coil can be accurately positioned with respect to the yoke and the like to improve performance.

The operation of the acoustic electromagnetic transducer according to claim 2 will be described below.
According to the present invention, in addition to the same structure as that of the first aspect, the bobbin and the guide part are integrally formed of a synthetic resin material. Therefore, according to the present claim, the guide part is integrally formed of the synthetic resin material on the bobbin, so that not only the same effect as in the first aspect is achieved, but also the manufacturing cost when the guide part is manufactured. In addition to being reduced, the guide portion can be arranged more accurately with respect to the bobbin.

The operation of the acoustic electromagnetic transducer according to claim 3 will be described below.
According to the present invention, in addition to the same configuration as that of the first and second aspects, there are two guide portions, and the cross-sectional shapes of the two guide portions are different from each other.

  Therefore, according to this claim, the cross-sectional shapes of the two guide portions are made different from each other, the winding start side leader line is arranged in one guide portion, and the winding end side leader line is arranged in the other guide portion. Thus, it is possible to always arrange the lead line on the winding start side and the lead line on the winding end side in a constant guide part. As a result, not only the operation similar to that of the first aspect is achieved, but also the problem of erroneous insertion of the coil lead wire during assembly has been solved.

The operation of the acoustic electromagnetic transducer according to claim 4 will be described below.
According to the present invention, in addition to the same configuration as in the first and second aspects, there are two guide portions, the cross section of one guide portion is formed in a circular shape, and the cross section of the other guide portion is formed. It has a configuration in which the shape is formed in a semicircular shape.

  Therefore, according to this claim, not only the cross-sectional shapes of the two guide portions are different from each other, but also one of the cross-sectional shapes is circular and the other of the cross-sectional shapes is semicircular. Thus, as in the third aspect, the lead wire on the winding start side and the lead wire on the winding end side can be always arranged in a fixed guide portion, and the problem of incorrect polarity insertion of the coil lead wire during assembly is solved. It became so.

The operation of the acoustic electromagnetic transducer according to claim 5 will be described below.
According to the present invention, in addition to the configuration similar to that of the third aspect, the terminal plate having the electrode terminals is fixed to the case lid, and the two relief portions having different shapes correspond to the two guide portions, respectively. It is configured to be formed on the lever terminal board.

  Therefore, according to this claim, for example, one relief portion of the terminal plate is formed in a shape that matches the shape of one guide portion, and the other relief portion of the terminal plate has a shape that matches the shape of the other guide portion. By forming the portion, it is possible to prevent erroneous insertion of the terminal plate into the case lid during assembly, and the arrangement of the lead wire on the coil winding start side and the arrangement of the lead wire on the winding end side in the terminal plate , Always constant.

The operation of the acoustic electromagnetic transducer according to claim 6 will be described below.
According to the present invention, in addition to the configuration similar to that of the fifth aspect, the cross-sectional shape of one relief portion is formed in a circle, and the cross-sectional shape of the other relief portion is formed in a semicircle. ing.

  Therefore, according to the present claim, for example, the lead-out line on the winding start side is arranged with the cross-sectional shape of one guide part being circular, and the lead-out line on the winding end side is arranged with the cross-sectional shape of the other guide part being semicircular. In accordance with this, the cross-sectional shape of one relief part is formed in a circle, and the cross-sectional shape of the other relief part is formed in a semicircle, so that the terminal board is erroneously inserted into the case lid during assembly. Prevention has been achieved more reliably.

The operation of the acoustic electromagnetic transducer according to claim 7 will be described below.
According to the present invention, in addition to the same configuration as that of the first to sixth aspects, the first engagement portion is formed on the case lid portion and the second engagement portion is formed on the terminal plate. The terminal plate is positioned with respect to the case lid portion by the engagement between the engaging portion and the second engaging portion.

  Therefore, according to this claim, the terminal plate is reliably positioned with respect to the case lid portion by the engagement between the first engagement portion and the second engagement portion, and workability at the time of assembly is improved. It was to improve.

The operation of the acoustic electromagnetic transducer according to claim 8 will be described below.
According to the present invention, in addition to the same configuration as in the third and fourth aspects, two through portions are formed in the flange portion of the bobbin corresponding to the two guide portions, and the shapes of these two through portions are It has a configuration of being different from each other.

  Therefore, according to the present invention, the two through portions having different shapes are formed in the flange portion of the bobbin so as to correspond to the two guide portions, so that the lead wires of the coils have different shapes at the time of assembly. It is no longer erroneously inserted by the two penetrating parts, and is reliably guided to the guide part.

The operation of the acoustic electromagnetic transducer according to claim 9 will be described below.
According to the present invention, in addition to the configuration similar to that of the eighth aspect, the through portion corresponding to the guide portion in which the cross-sectional shape of the two through portions is formed in a semicircular shape is formed from the outer periphery of the bobbin collar portion. The guide portion is formed in a slit shape.

  Therefore, according to the present invention, the through portion corresponding to the guide portion having a semicircular cross-sectional shape is formed in a slit shape, so that the coil lead wire can be more easily attached to the guide portion during assembly. I was able to guide.

  According to the present invention, not only can the lead wire which is the end of the coil be easily insulated and locked to reduce the manufacturing cost, but also the sound can be accurately positioned with respect to the yoke or the like to improve the performance. An electromagnetic conversion device for use will be obtained.

1 to 5 show an embodiment of an acoustic electromagnetic transducer according to the present invention, and this embodiment will be described based on these drawings.
As shown in FIG. 1, a case body 12 having a cylindrical shape and a housing member made of a nonmagnetic material serving as an outer space of an acoustic electromagnetic transducer 10 to which the present embodiment is applied, and the case body 12 The case lid 14 is screwed with a bolt 16 so as to close the left end, and has a structure having a space inside the housing member constituted by the case body 12 and the case lid 14. Yes.

  The case main body 12 has a cylindrical space inside and has a through hole 12A at the left end which is the bottom, and the telescopic transmission rod 18 protrudes from the through hole 12A of the case main body 12 in the form of a distal end. The case body 12 is disposed on the left end side. A male screw is formed on the distal end side of the expansion / contraction transmission rod 18, and a diaphragm (not shown) is screwed and connected.

  On the other hand, a flange portion 18A is formed on the proximal end side of the telescopic transmission rod 18, and an elastic body 22 formed of a rubber material or the like is provided between the flange portion 18A and the bottom portion of the case body 12. It has a structure in which the elastic body 22 is always pressed to the right side in FIG.

  An upper yoke 24 is fitted to the right end side of the telescopic transmission rod 18 in FIG. 1, and a bobbin 30 having a flange 30A on both end sides and wound with a wire is provided on the further right side of the upper yoke 24. The cylindrical bias magnet 34 is arranged on the outer peripheral side of the coil 26. A rod-shaped magnetostrictive element 28 is incorporated in the central portion of the bobbin 30 so as to expand and contract, and the left end side of the magnetostrictive element 28 in FIG. 1 is in contact with the upper yoke 24. Further, on the right side of the bobbin 30 in FIG. 1, a yoke 36 formed in a disk shape with a magnetic material such as iron is disposed, and the right end side of the magnetostrictive element 28 is in contact with the yoke 36. .

  As described above, in the present embodiment, the elastic body 22, the magnetostrictive element 28, the bias magnet 34, the bobbin 30, and the elastic body 22 are positioned adjacent to the right end in FIG. 1 that is one end of the bobbin 30. The yoke 36 and the like are arranged in the housing member.

  As shown in FIG. 1, the flange portion 30A constituting one end of the bobbin 30 has two guide portions 31 each having a dimension L2 that is longer than the dimension L1 obtained by adding the thicknesses of the yoke 36 and the case lid 14 together. , 32 are formed integrally with the bobbin 30 from a synthetic resin material.

  Accordingly, the two guide portions 31 and 32 extend along the direction in which the magnetostrictive element 28 extends, and the two guide portions 31 and 32 are provided with holes 36A and 14A provided in the yoke 36 and the case lid portion 14, respectively. The yoke 36 and the case lid 14 are penetrated while being fitted. Accordingly, the lead wire 26A on the winding start side and the lead wire 26B on the winding end side of the coil 26 are guided by the guide portions 31 and 32, respectively, and are drawn out of the case lid portion 14. .

  However, as shown in FIGS. 4 and 5, one of the two guide portions 31 and 32 has a circular cross-sectional shape as it is formed in a circular tube shape, As the other guide portion 32 is formed into a semicircular tube, the cross-sectional shape is formed in a semicircular shape, and the cross-sectional shapes of the two guide portions 31 and 32 are different from each other.

  A terminal plate 40 having two electrode terminals 42 is fastened to the case lid 14 by bolts 44 on the right side of the yoke 36 and the case lid 14 in FIG. Leaders 26A and 26B penetrating the plate 40 are respectively tangled to these electrode terminals 42.

  At this time, as shown in FIGS. 2 and 3, the case lid portion 14 is formed with a convex portion 46 as a first engaging portion, and the terminal plate 40 has a concave portion 48 as a second engaging portion. The terminal plate 40 is positioned with respect to the case lid 14 in the rotational direction by the engagement between the convex portion 46 and the concave portion 48.

  The terminal plate 40 is formed with two recessed relief portions 40A and 40B corresponding to the two guide portions 31 and 32 protruding through the case lid portion 14, respectively. 2 and 3, the cross-sectional shape of one escape portion 40A is formed in a circle according to the shape of these two guide portions 31, 32, and the cross-sectional shape of the other escape portion 40B is a semi-circle. In the formed shape, the shapes of these two relief portions 40A and 40B are different from each other.

Next, the operation of the acoustic electromagnetic transducer 10 according to the present embodiment will be described.
According to the acoustic electromagnetic transducer 10 of the present embodiment, the wire forming the coil 26 for generating a magnetic field is wound around the bobbin 30, and the magnetostrictive element 28 is disposed at the center of the bobbin 30. A yoke 36 is disposed in contact with one end side of the bobbin 30. The case body 12 and the case lid 14 are built and held, and the terminal plate 40 having the terminal electrodes 42 is fitted to the case lid 14.

  Further, two guide portions 31 and 32 each having a dimension L2 longer than the dimension L1 obtained by adding the thicknesses of the yoke 36 and the case lid portion 14 are integrally formed with the flange portion 30A on one end side of the bobbin 30 by a synthetic resin material. The lead wires 26A and 26B of the coil 26 are formed in the guide portions 31 as the guides 31 and 32 are inserted through the yoke 36 and the case lid portion 14 while being fitted. , 32 and drawn out of the case lid 14 and led to the terminal board 40.

  That is, two guide portions 31 and 32 are formed on one end side of the bobbin 30 to be opposed to the yoke 36, and the lead lines 26 </ b> A and 26 </ b> B of the coil 26 are disposed along these guide portions 31 and 32. In addition, the conductive metal material such as the yoke 36 and the case lid 14 and the lead wires 26A and 26B can be isolated and insulated easily and securely, and the lead wires 26A and 26B can be locked, which is conventionally used. There is no need to use insulating tubes or tape.

  Further, the guide portions 31 and 32 formed on the bobbin 30 and the yoke 36 and the case lid portion 14 are fitted as described above, so that the yoke 36 and the case lid portion 14 are wound around the bobbin 30. Thus, accurate positioning of the coil 26 was made possible. As a result, the coil 26 can be installed so that the center of the coil 26 is accurately positioned at the center of the opposing surface of the yoke 36. When a current is applied to the coil 26, the magnetic field generated by the coil 26 is uniform and stable. In addition to the magnetostrictive element 28, the expansion / contraction amount of the magnetostrictive element 28 is stabilized.

  As described above, according to the acoustic electromagnetic conversion device 10 of the present embodiment, the structure is simplified and the assembly is facilitated as the lead wires 26A and 26B serving as the ends of the coil 26 are easily insulated and locked. As a result, the manufacturing cost can be reduced and the size can be reduced, and the coil 26 can be accurately positioned with respect to the yoke 36 and the like to improve the performance.

  Further, according to the present embodiment, the bobbin 30 and the two guide portions 31 and 32 are integrally formed of a synthetic resin material, so that the manufacturing cost when manufacturing the guide portions 31 and 32 is also reduced. In addition, the guide portions 31 and 32 can be arranged more accurately with respect to the bobbin 30.

  On the other hand, in the present embodiment, there are two guide portions, and not only the cross-sectional shapes of the two guide portions 31 and 32 are different from each other, but also the terminal plate 40 provided with the electrode terminals 42, Two relief portions 40A and 40B having different shapes are formed corresponding to the two guide portions 31 and 32, respectively.

  Therefore, according to the present embodiment, the lead-out line 26A on the winding start side is arranged on one guide portion 31 having a circular cross-sectional shape by making the cross-sectional shapes of the two guide portions 31, 32 different from each other. Then, by arranging the winding end side lead wire 26B on the other guide portion 32 having a semicircular cross-sectional shape, the winding start side lead wire 26A and the winding end side lead wire 26B are always fixed guide portions. 31 and 32 can be arranged respectively. As a result, the problem of erroneous insertion of the lead lines 26A and 26B of the coil 26 during assembly has been solved.

  At this time, as shown in FIG. 5, two through portions 30 </ b> B and 30 </ b> C are formed in the flange portion 30 </ b> A of the bobbin 30 corresponding to the two guide portions 31 and 32, respectively. However, although the shapes of these two through portions 30B and 30C are different from each other and the through portion 30B corresponding to the guide portion 31 formed in a circular cross section is circular, the cross sectional shape is semicircular. The through portion 30 </ b> C corresponding to the guide portion 32 is formed in a slit shape extending from the outer periphery of the flange portion 30 </ b> A of the bobbin 30 to the guide portion 32.

  Therefore, according to the present embodiment, the two through portions 30B and 30C having different shapes are formed in the flange portion 30A of the bobbin 30 corresponding to the two guide portions 31 and 32. The lead wires 26A and 26B of the coil 26 are not erroneously inserted by the two through portions 30B and 30C having different shapes, and are reliably guided to the guide portions 31 and 32.

  Further, the through portion 30C corresponding to the guide portion 32 having a semicircular cross-sectional shape is formed in a slit shape so that the lead wire 26B of the coil 26 can be more easily guided to the guide portion 32 at the time of assembly. It also became.

  Further, the cross-sectional shape of one relief portion 40A of the terminal plate 40 is formed in a circle according to the shape of one guide portion 31, and the other relief portion of the terminal plate 40 according to the shape of the other guide portion 32. By forming the cross-sectional shape of 40B into a semicircular shape, erroneous insertion of the terminal plate 40 into the case lid portion 14 during assembly is prevented, and the lead wire 26A on the winding start side of the coil 26 in the terminal plate 40 can be prevented. The arrangement and the arrangement of the leader line 26B on the winding end side are always constant.

  On the other hand, in the present embodiment, the convex portion 46 that is the first engaging portion is formed in the case lid portion 14, and the concave portion 48 that is the second engaging portion is formed in the terminal plate 40. The terminal plate 40 is positioned with respect to the case lid portion 14 by the engagement with 48. Therefore, according to the present embodiment, the terminal plate 40 is reliably positioned with respect to the case lid portion 14 by the engagement between the convex portion 46 and the concave portion 48, and workability at the time of assembly is improved. Decided to do.

  In the above-described embodiment, one of the two guide portions 31 and 32 of the bobbin 30 has a circular cross-sectional shape, and the other guide portion 32 has a semi-circular cross-sectional shape. At the same time, the cross-sectional shape of one escape portion 40A of the terminal board 40 is circular, and the cross-sectional shape of the other escape portion 40B is semicircular. Although the cross-sectional shapes between the two relief portions 40A and 40B are different from each other, these shapes may be other shapes, for example, a polygonal cross-sectional shape such as a triangle or a quadrangle.

  Further, the bobbin 30 and the guide portions 31 and 32 are formed of a polymer material such as a synthetic resin. Specifically, for example, it is conceivable to use a liquid crystal polymer, a PPS (polyphenylene sulfide) resin, or the like. On the other hand, in the above embodiment, the first engaging portion of the case lid portion 14 is a convex portion and the second engaging portion of the terminal plate 40 is a concave portion. However, even if the convex portion and the concave portion are formed in reverse. good.

It is sectional drawing of the electromagnetic transducer for acoustics which concerns on one embodiment of this invention. FIG. 2 is a view taken along line 2-2 in FIG. 1 (leader lines are omitted). It is a principal part disassembled perspective view of the electromagnetic transducer for acoustics which concerns on one embodiment of this invention. 1 is a perspective view of a bobbin applied to an acoustic electromagnetic transducer according to an embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 4. It is a perspective view of the bobbin applied to the electromagnetic transducer for sound which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Acoustic electromagnetic transducer 12 Case main body 14 Case cover part 26 Coil 28 Magnetostrictive element 30 Bobbin 30A collar part 30B Through part 30C Through part 31 Guide part 32 Guide part 36 Yoke 40 Terminal board 40A Escape part 40B Escape part 42 Electrode terminal 46 Convex part (first engaging part)
48 Recessed part (second engaging part)

Claims (9)

A coil for generating a magnetic field, a bobbin in which a wire forming the coil is wound, a magnetostrictive element disposed at the center of the bobbin, a yoke disposed in contact with one end of the bobbin, and these members are incorporated. An acoustic electromagnetic transducer having a case main body and a case lid for holding, and a terminal plate fitted to the case lid and having a terminal electrode,
A guide part longer than the dimension obtained by adding the thickness of the yoke and the case lid part is provided on the collar part forming one end side of the bobbin,
The guide passes through the yoke and the case cover, and the lead wire of the coil is guided by the guide and drawn out from the case cover to the terminal plate. Electromagnetic conversion device.   The acoustic electromagnetic transducer according to claim 1, wherein the bobbin and the guide portion are integrally formed of a synthetic resin material.   The acoustic electromagnetic transducer according to claim 1, wherein there are two guide portions, and the cross-sectional shapes of the two guide portions are different from each other.   3. The guide portion according to claim 1, wherein two guide portions exist, the cross-sectional shape of one guide portion is formed in a circular shape, and the cross-sectional shape of the other guide portion is formed in a semicircular shape. Electromagnetic transducer for sound. A terminal plate with electrode terminals is fixed to the case lid,
4. The acoustic electromagnetic transducer according to claim 3, wherein two relief portions having different shapes are formed on the terminal plate corresponding to the two guide portions, respectively.   6. The acoustic electromagnetic transducer according to claim 5, wherein a cross-sectional shape of one relief portion is formed in a circular shape, and a cross-sectional shape of the other relief portion is formed in a semicircular shape.   A first engagement portion is formed on the case lid portion and a second engagement portion is formed on the terminal plate, and a terminal for the case lid portion is formed by the engagement between the first engagement portion and the second engagement portion. The acoustic electromagnetic transducer according to any one of claims 1 to 6, wherein the plate is positioned. Two penetrating parts are formed in the collar part of the bobbin corresponding to the two guide parts,
The acoustic electromagnetic transducer according to claim 3 or 4, wherein the shapes of the two through portions are different from each other.   The penetrating part corresponding to the guide part in which the cross-sectional shape of the two penetrating parts is formed in a semicircular shape is formed in a slit shape from the outer periphery of the collar part of the bobbin to the guide part. The electromagnetic transducer for sound according to 8.

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