JP2006020135A - Diaphragm driving unit and thin speaker using the unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diaphragm driving unit whose thickness can be reduced. <P>SOLUTION: In this diaphragm driving unit, a plurality of permanent magnets 22 whose cross section perpendicular to a magnetization direction is rectangular are arranged on a yoke plate 21 so as to make the directions of magnetic poles to be alternate, a coupler member 24 is arranged at a position opposite from the yoke plate 21 with a predetermined distance left from the top face of the permanent magnets 22, the coupler member 24 is elastically supported by a plate spring 23 fixed to the circumference of the yoke plate 21, and coils 27 wound in one plane are respectively provided at a position of the coupler member 24, which corresponds to each of the permanent magnets 22 and are connected in serial. In the coils 27, current in the same direction is caused to flow around adjacent coils with each other when the current is caused to flow from a winding start point of the first coil to a winding end point of the last coil. Attaching the diaphragm 2 to the coupler member provides a thin speaker. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a diaphragm driving unit and a thin speaker using the unit, and in particular, a thin diaphragm driving unit capable of functioning as a diaphragm of a speaker by attaching the diaphragm to the diaphragm, and the unit. It relates to the thin speaker used.

  A speaker is a device that radiates sound waves into a space by converting sound or music signals converted into electrical signals into acoustic vibrations, and a permanent coil that generates a magnetic field around the voice coils to which electrical signals are input. A magnetic circuit including a magnet and a yoke, and a diaphragm that vibrates by movement of the voice coil are provided.

  Conventional speakers generally have a metal frame with a truncated cone shape, a magnetic circuit consisting of a permanent magnet and a yoke attached to the back side (upper bottom), and cone-shaped vibration on the front side (lower bottom) of the metal frame. The large diameter side of the plate was supported by an edge, and a voice coil was wound around the position of the magnetic circuit on the bobbin attached to the center of the diaphragm. The speaker having such a structure is installed in a box for listening to music outdoors or at home, and also installed in a vehicle, for example, a passenger compartment of a passenger car, and output from a radio or a car stereo device. It is used to play music and audio.

  However, when a speaker is installed in the passenger compartment of a passenger car, a speaker having such a diaphragm requires a predetermined distance from the yoke to the edge. Thickness was necessary. For example, if the speaker is installed in a door or ceiling, the door or ceiling will be thicker, or if the thickness of the door or ceiling is left as it is, There was a problem that a bulge protruding inward occurred.

  In order to solve this problem, Patent Document 1 discloses a thin speaker in which the shape of a diaphragm is changed from a cone shape to a disk shape to reduce the thickness of the speaker. However, even in this thin speaker, since the diaphragm is attached to a metal frame and used, it is insufficient for making the speaker thin.

  Therefore, as a speaker installed in the passenger compartment of a passenger car, a thin speaker using a diaphragm driving unit has been proposed, which has a structure in which a cone-shaped diaphragm is omitted and an interior material in the passenger compartment is used as a diaphragm.

  FIG. 1 shows the structure of a conventional diaphragm drive unit 10. FIG. 1 (a) shows a side view of the drive unit 10 attached to an interior plate 1 of an automobile, with a half from the center in a longitudinal section. FIG. 5B shows a state in which the diaphragm driving unit 10 in FIG.

  As shown in FIG. 1A, the diaphragm driving unit 10 includes a round dish-shaped outer yoke 11 having a concave portion in which a side wall portion and a bottom portion are continuously formed, and a bottom portion of the outer yoke 11. There is provided a magnetic circuit section comprising a disk-shaped permanent magnet 12 attached and a disk-shaped inner yoke 13 mounted on the permanent magnet 12 and having a diameter slightly larger than the diameter of the permanent magnet 12. .

  A gap is provided between the inner surface of the side wall portion of the outer yoke 11 and the outer peripheral surface of the inner yoke 13 of the magnetic circuit portion, and the voice coil 15 wound around the cylindrical bobbin 14 in the gap portion. Is located. The bobbin 14 is fixed to a coupler member 16 attached to the interior plate 1 of the automobile, and a leg portion 16a protruding toward the magnetic circuit portion side is provided on the outer peripheral portion of the coupler member 16. In this example, the number of the leg portions 16 a is three as shown in FIG. 1B, and the leg portions 16 a are provided at equal intervals on the outer peripheral portion of the coupler member 16. The leg portion 16 a is connected to the outer peripheral portion of the outer yoke 11 via the leaf spring 17.

  As shown in FIG. 1B, the leaf spring 17 includes an annular base portion 17b and an arm portion 16a extending concentrically from the base portion 16b to the base portion 16b. And the front-end | tip part of this arm part 16a is attached to the leg part 16a with the screw | thread 18. FIG. In this example, the lengths of the three arm portions 16a are all the same.

  When an AC drive signal is supplied to the voice coil 15 of the diaphragm drive unit 10 configured as described above, vibration is generated in the bobbin 14 in accordance with the frequency of the AC drive signal by the action of the magnetic circuit unit. This vibration is transmitted to the interior board 1 through the coupler member 16. Since the interior plate 1 is made of a material such as urethane or foamed resin (for example, foamed polypropylene), the interior plate 1 itself serves as a diaphragm, and sound is radiated to the vehicle interior side by the vibration of the interior plate 1. The

  Thus, by using the interior plate 1 as a diaphragm, it is possible to form a good sound field in the vehicle interior, and the thickness of the drive unit 10 can be reduced by the amount of the diaphragm. A thin speaker can be realized. In addition, if this diaphragm drive unit 10 is directly attached to a lightweight diaphragm not only the interior plate 1 of an automobile, a panel type speaker device can be configured.

Japanese Patent Laid-Open No. 9-130892 (FIG. 1)

  However, the conventional diaphragm driving unit 10 configured as described above includes a magnetic circuit composed of an outer yoke 11 and an inner yoke 13 sandwiching the permanent magnet 12, and a bobbin 14 for winding the voice coil 15. The wires of the voice coil 15 on the bobbin 14 are arranged in a direction perpendicular to the magnetic field generated between the inner surface of the side wall portion of the outer yoke 11 and the outer peripheral surface of the inner yoke 13. For this reason, the magnetic circuit has a predetermined height, and a space for securing the width of the voice coil and the amplitude of the bobbin 14 is required. For the reduction of the dimension in the thickness direction of the diaphragm driving unit 10 Was still not enough.

  Therefore, the present invention reduces the thickness by changing the arrangement of the yoke and permanent magnet constituting the magnetic circuit and the arrangement of the wires constituting the voice coil, and eliminating the bobbin, thereby reducing the overall thickness. It is another object of the present invention to provide a diaphragm driving unit that can be further reduced.

  The diaphragm drive unit of the present invention that achieves the above object can take the following first to sixteenth forms.

  The diaphragm drive unit according to the first aspect opposes the yoke plate, a plurality of permanent magnets arranged on the yoke plate so that the polarities of the adjacent permanent magnets are opposite to each other, and the yoke plate. The coupler member is disposed at a predetermined distance from the top surface of the permanent magnet and can be attached to the diaphragm on the surface opposite to the yoke plate. The coupler member is provided around the yoke plate and elastically supports the coupler member. An elastic body and a coil provided in a position corresponding to each of the permanent magnets of the coupler member, and a coil wound in one plane so as to have a side in a direction perpendicular to the magnetic force line between the permanent magnets. Each coil is connected in series so that the inner winding start point is connected to the outer winding end point of the other coil, and from the first coil winding start point to the last coil winding end point. When a current flows Te, the sides of adjacent coils is characterized in that it is connected to flow a current of the same orientation.

  The diaphragm driving unit according to the second aspect is the same as the diaphragm driving unit according to the first aspect, in which the surface of the coupler member facing the permanent magnet and the surface facing the portion around the permanent magnet expands by the same height. The coil is arranged at the bulging portion.

  The diaphragm drive unit according to the third aspect is the diaphragm drive unit according to the first aspect, wherein the permanent magnet can be inserted into the portion of the coupler member facing the permanent magnet when the coupler member moves to the yoke plate side. A through hole is provided, and the coil is arranged in a portion around the through hole.

  A diaphragm drive unit according to a fourth aspect includes a yoke plate, a plurality of permanent magnets arranged on the yoke plate with the same polarity, and a portion around the permanent magnet of the yoke plate so as to surround the permanent magnet. Further, the magnetic circuit having a bulging portion bulged to the same height as the permanent magnet and a top surface of the permanent magnet are arranged at a position facing the yoke plate and spaced apart from each other by a predetermined distance. A coupler member to which a diaphragm can be attached on the opposite surface, an elastic body provided around the yoke plate and elastically supporting the coupler member, and a position corresponding to each of the permanent magnets of the coupler member. Each coil is wound in one plane so as to have a side perpendicular to the magnetic field lines between the permanent magnets, and each coil has an inner winding start point outside the other coil. Connect to So that when the current flows from the winding start point of the first coil to the winding end point of the last coil, currents in different directions flow between the sides of the adjacent coils. It is characterized by being connected.

  The diaphragm drive unit according to the fifth aspect includes a plurality of yoke plates and a plurality of adjacent permanent magnets arranged on opposite surfaces of the yoke plates so that the polarities are opposite to each other. The permanent magnet and the top surface of the permanent magnet are arranged at a predetermined distance in the middle of the two yoke plates, and a diaphragm is attached to one outer side of the two yoke plates via a mounting member. A possible coupler member, an elastic body provided around each of the two yoke plates, and elastically supporting the coupler member on an intermediate portion of the two yoke plates, and a permanent magnet on one surface of the coupler member Each coil has a coil wound in one plane so as to have a side perpendicular to the magnetic field lines between the permanent magnets, and each coil has an inner winding start point. Coil of When the current flows from the winding start point of the first coil to the winding end point of the last coil, the adjacent coil sides are connected to each other. It is connected so that the electric current of the same direction may flow.

  A diaphragm driving unit according to a sixth aspect is the diaphragm driving unit according to the fifth aspect, wherein a coil is also provided on the other surface of the coupler member.

  A diaphragm drive unit according to a seventh aspect is the diaphragm drive unit according to any one of the first to sixth aspects, wherein an elastic body that elastically supports the coupler member is fixed to the yoke plate, and from the base to the yoke plate The coupler member is elastically supported at the distal end portion of the arm portion.

  The diaphragm drive unit according to the eighth aspect is the diaphragm drive unit according to the seventh aspect, wherein the number and shape of the arm portions are determined by the shape and size of the diaphragm.

  The diaphragm drive unit according to the ninth aspect is the diaphragm drive unit according to the seventh or eighth aspect, wherein the elastic modulus of the arm part is provided, the arm part is uneven, the hole is formed, and a heavy object is attached to the arm part. It is characterized by changing by at least one method.

  A diaphragm drive unit according to a tenth aspect is characterized in that, in any one of the seventh to ninth diaphragm drive units, the coupler member and the arm portion are coupled by an attachment member and a screw.

  In the diaphragm drive unit of the eleventh aspect, in the diaphragm drive unit of the tenth aspect, a link member is spanned between adjacent mounting members, and the link member and the elastic body are placed at a predetermined position. The elastic coefficient of the arm portion is changed by coupling with a clamp member.

  The diaphragm drive unit according to a twelfth aspect is the diaphragm drive unit according to any one of the first to sixth aspects, wherein an elastic body that elastically supports the coupler member is fixed to the yoke plate, and the base to the yoke It is composed of an arm portion that extends along the periphery of the plate, and the coupler member is coupled to the arm portion at the distal end portion, and is coupled and elastically supported even at a predetermined distance from the distal end portion. It is characterized by.

  A diaphragm drive unit according to a thirteenth aspect is characterized in that, in the diaphragm drive unit according to any one of the first to twelfth aspects, a corner portion of a wound coil is bent in an arc shape. .

  A diaphragm drive unit according to a fourteenth aspect is the diaphragm drive unit according to any one of the first to thirteenth aspects, wherein the permanent magnet has a rectangular cross section perpendicular to the magnetization direction. Is.

  A diaphragm drive unit according to a fifteenth aspect is characterized in that, in the diaphragm drive unit according to any one of the first to fourteenth aspects, a coupler member is provided with a heat dissipation structure for radiating heat generated in a coil. is there.

  A diaphragm drive unit according to a sixteenth aspect is the diaphragm drive unit according to the fifteenth aspect, wherein the heat dissipation structure is a heat dissipating sheet laminated on a surface opposite to the coil installation surface of the coupler member. It is what.

  The diaphragm drive unit according to the seventeenth aspect is the diaphragm drive unit according to the fifteenth aspect, wherein the heat dissipation structure is a heat radiating sheet laminated between the coil installation surface of the coupler member and the coil. It is a feature.

  The diaphragm drive unit according to an eighteenth aspect is the diaphragm drive unit according to the fifteenth aspect, wherein the heat dissipation structure is a heat sink attached to a surface opposite to the coil installation surface of the coupler member. Diaphragm drive unit.

  The diaphragm drive unit according to the nineteenth aspect is the diaphragm drive unit according to the seventeenth aspect, further comprising a heat sink attached to the surface of the yoke plate opposite to the attachment surface of the permanent magnet, This heat sink is connected with a heat conducting member.

  The diaphragm drive unit according to the twentieth aspect is the diaphragm drive unit according to any one of the first to nineteenth aspects, wherein the total weight of the movable part of the diaphragm drive unit including the elastic body and the movable of the diaphragm drive unit are The weight ratio with respect to the total weight of the drive part excluding the part is between 0.3 and 3.0.

  The thin speaker using the diaphragm driving unit according to the present invention has the diaphragm attached to the coupler member directly or via the vibration transmitting member in any of the first to twentieth diaphragm driving units. It is characterized by this.

  Further, in the thin speaker using the diaphragm driving unit of the present invention, the coupler member of the diaphragm driving unit of the first embodiment is replaced by the diaphragm, and the diaphragm is directly driven by the diaphragm driving unit. It is a feature. A thin speaker using the diaphragm driving unit. In this case, the coil may be embedded in the diaphragm.

  According to the diaphragm drive unit of the first embodiment, the thickness of the diaphragm drive unit can be reduced.

  According to the diaphragm drive unit of the second embodiment, since the magnetic flux density can be effectively used, the driving force can be increased.

  According to the diaphragm drive unit of the third embodiment, the diaphragm can be reduced in weight and the sound pressure increases. Further, the thickness can be further reduced as compared with the diaphragm driving unit of the first embodiment.

  According to the diaphragm drive unit of the fourth embodiment, it is possible to increase the driving force by effectively using the magnetic flux density.

  According to the diaphragm drive units of the fifth and sixth embodiments, since the number of magnetic circuits is increased, efficient use of magnetic flux can be achieved and driving force can be increased.

  According to the diaphragm drive unit of the seventh aspect, the coupler member can be elastically supported stably.

  According to the diaphragm drive units of the eighth and ninth embodiments, the frequency characteristics and minimum limit frequency of the diaphragm can be controlled.

  According to the diaphragm drive unit of the tenth aspect, the coupler member and the arm portion can be firmly coupled.

  According to the diaphragm drive units of the eleventh and twelfth aspects, the frequency characteristics and minimum limit frequency of the diaphragm can be controlled.

  According to the diaphragm drive units of the thirteenth and fourteenth embodiments, the magnetic flux can be used efficiently and the driving force can be increased.

  According to the diaphragm drive units of the fifteenth to nineteenth aspects, Joule heat generated in the coil can be efficiently radiated by the heat dissipation structure of the coupler member, and thus input resistance can be improved.

  According to the diaphragm drive unit of the twentieth aspect, the sound pressure can be increased by the optimum weight ratio between the drive unit and the movable unit.

  In addition, a thin speaker using the diaphragm drive unit of the present invention can be thinned.

  Next, an embodiment according to the diaphragm driving unit of the present invention and an embodiment of a thin speaker using the diaphragm driving unit will be described with reference to specific examples shown in the accompanying drawings.

  FIGS. 2A and 2B show a diaphragm driving unit 41 according to the first embodiment of the present invention. FIG. 3 is an exploded view showing the structure of the diaphragm driving unit 41 disassembled. is there. As shown in FIG. 3, the diaphragm drive unit 41 of the first embodiment is provided around a flat yoke plate 21, a plurality of permanent magnets 22 disposed on the yoke plate 21, and the yoke plate 21. The plate spring 23 is an elastic body and a plate-shaped coupler member 24 elastically supported by the plate spring 23.

  The yoke plate 21 is made of a magnetic material and has a rectangular shape (in this embodiment, a square), and a plurality of permanent magnets 22 on the yoke plate 21 are spaced apart from each other by a predetermined distance, and are opposite in polarity to the adjacent permanent magnets 22. It is arranged to become. That is, one permanent magnet 22 of this embodiment has an N pole on the top surface side and an S pole on the yoke plate side, and a permanent magnet adjacent thereto has an S pole on the top surface side and an N pole on the yoke plate side. The permanent magnet 22 has a rectangular cross section perpendicular to the magnetization direction, and in this embodiment, a square, and the side surfaces of the adjacent permanent magnets 22 are parallel to each other. For this reason, the magnetic field lines coming out of the N pole of the permanent magnet go to the S pole of the adjacent permanent magnet 22, so that a parallel magnetic field is generated between the two permanent magnets 22. The permanent magnets 22 of this embodiment are regularly arranged in the vertical direction and three in the horizontal direction, but the number of permanent magnets 22 is not particularly limited, and the number can be increased or decreased as necessary. it can.

  A leaf spring 23 attached to a position indicated by a two-dot chain line around the yoke plate 21 includes a frame-like base portion 23b fixed to the yoke plate 21 and an arm extending from the base portion 23b along the periphery of the yoke plate 21. Part 23a. In this embodiment, the arm portion 23a extends from the four corners of the base portion 23b in the direction of the four corners adjacent to the base portion 23b substantially in parallel. And the attachment hole 23c is provided in the front-end | tip part of the arm part 23a.

  On the other hand, the flat coupler member 24 is formed of a resin plate. And the attachment hole 24c is provided in the part of the four corners of the coupler member 24 corresponding to the attachment hole 23c of this arm part 23a. Therefore, the coupler member 24 is attached to the leaf spring 23 via the screw 25 inserted through the attachment hole 23c of the arm portion 23a from the yoke plate 21 side and the hollow sleeve 26 through which the screw 25 is inserted. When the coupler member 24 is mounted on the yoke plate 21 via the leaf spring 23, the state shown in FIG. In this state, a predetermined distance is provided between the coupler member 24 and the top surface of the permanent magnet 22 as shown in FIG.

  The diaphragm 2 is attached to the front surface of the coupler member 24 as shown in FIG. As the diaphragm 2, a lightweight and rigid material such as a honeycomb plate is used. Moreover, the diaphragm 2 can also be used as an interior plate of the vehicle. On the other hand, a coil 27 is disposed on the back surface of the coupler member 24 where the diaphragm 2 is not attached. As shown in FIG. 3, when the permanent magnet 22 is arranged on the yoke plate 21, as shown in FIG. 2 (b), the top surface side is from the N pole magnet 22 to the S pole magnet 22 from the top surface side. A magnetic field is generated in the lateral direction. The coil 27 is arranged in the direction perpendicular to the magnetic field in the lateral magnetic field.

  The coil 27 is provided in a position corresponding to each of the permanent magnets 22 of the coupler member 24 and is wound in one plane so as to have a side perpendicular to the magnetic force line between the permanent magnets 22. . Therefore, the coil 27 provided on the opposing surface of one permanent magnet 22 has a rectangular spiral shape. And as shown in FIG.2 (b), the electric current of the same direction flows into the adjacent edge | side of an adjacent coil.

  For this reason, as shown in FIG. 4, each coil 27 is connected in series so that the inner winding start point is connected to the outer winding end point of the other coil 27. The winding start point of the first coil 27 a is connected to the + terminal of the terminal plate 28, and the winding end point of the last coil 27 e is connected to the − terminal of the terminal plate 28. In this way, when current flows from the winding start point of the first coil 27s toward the winding end point of the last coil 27e, currents in the same direction flow between the sides of the adjacent coils 27. The connection of the coil 27 in FIG. 4 is an example, and the connection between the coils 27 is not limited to this example. The terminal plate 28 is generally provided on the bottom side of the yoke plate 21 and is connected to both ends of the coil 27 of the coupler member 24 using tinsel wires.

  FIG. 5 shows the structure of the diaphragm driving unit 42 according to the second embodiment of the present invention. FIG. 5A shows the coupler member 24 and the sleeve 26 of the diaphragm driving unit 42 as viewed from the back side. FIG. 5B is a partial sectional view of the drive unit 42 of the second embodiment. The diaphragm driving unit 42 of the second embodiment is different from the diaphragm driving unit 41 of the first embodiment only in the structure of the coupler member 24. Therefore, in the diaphragm drive unit 42 of the second embodiment, the same components as those of the diaphragm drive unit 41 of the first embodiment will be described with the same reference numerals.

  As shown in FIGS. 5A and 5B, the diaphragm drive unit 42 of the second embodiment is a portion facing the portion around the permanent magnet 22 on the surface of the coupler member 24 facing the permanent magnet 22. However, the bulging portion 24a is formed by bulging to the permanent magnet 22 side by the same height. The bulging portion 24 a has a lattice shape, and the outer shape of the recess 24 d surrounded by the bulging portion 24 a is larger than the outer shape of the permanent magnet 22. And the coil 27 is arrange | positioned similarly to the 1st Example on the top surface 24b of this bulging part 24a. The arrangement pattern of the coils 27 may be the same as the pattern shown in FIG.

  Thus, by providing the bulging portion 24a on the coupler member 24 and disposing the coil 27 on the top surface 24b, the coil 27 can be disposed in a portion where the strength of the magnetic field between the two permanent magnets 22 is strong. it can. As a result, since the diaphragm driving unit 42 of the second embodiment can effectively use the magnetic flux density generated by the permanent magnet 22, the coupler member 24 of the coupler member 24 can be compared with the diaphragm driving unit 41 of the first embodiment. The driving force can be increased.

  FIG. 6 shows the structure of the diaphragm drive unit 43 according to the third embodiment of the present invention. FIG. 6A shows the coupler member 24 and the sleeve 26 of the diaphragm drive unit 43 as viewed from the front side. FIG. 5B is a partial cross-sectional view of the drive unit 43 of the third embodiment. The diaphragm driving unit 43 of the third embodiment is different from the diaphragm driving unit 41 of the first embodiment only in the structure of the coupler member 24. Therefore, in the diaphragm drive unit 43 of the third embodiment, the same components as those of the diaphragm drive unit 41 of the first embodiment will be described with the same reference numerals.

  As shown in FIGS. 6A and 6B, the diaphragm drive unit 43 of the third embodiment has a through hole 29 in a portion of the coupler member 24 facing the permanent magnet 22 on the portion facing the permanent magnet 22. Is provided. The size of the through hole 29 is such that the permanent magnet 22 can be inserted when the coupler member 24 moves to the yoke plate 21 side. The coil 27 is disposed in a portion around the through hole 29. The arrangement pattern of the coils 27 may be the same as the pattern shown in FIG.

  As described above, by providing the through hole 29 in the coupler member 24 and arranging the coil 27 therearound, the permanent magnet 22 on the yoke plate 21 can penetrate the coupler member 24 even if the coupler member 24 vibrates. It enters and exits the hole 29 and does not contact the coupler member 24. Therefore, in the third embodiment, the entire length of the sleeve 26 can be shortened, and the coupler member 24 can be disposed closer to the yoke plate 21 than the coupler member 24 of the first embodiment. As a result, the diaphragm driving unit 42 of the third embodiment can be made thinner than the diaphragm driving unit 41 of the first embodiment. Furthermore, by providing the coupler member 24 with the through hole 29, the weight of the coupler member 29 can be reduced, and the sound pressure can be increased.

  In addition, in the third embodiment, as in the second embodiment, the coil 27 can be disposed in a portion where the strength of the magnetic field between the two permanent magnets 22 is strong. As a result, since the diaphragm driving unit 43 of the third embodiment can effectively use the magnetic flux density generated by the permanent magnet 22, the coupler member 24 of the coupler member 24 can be compared with the diaphragm driving unit 41 of the first embodiment. The driving force can be increased.

  FIG. 7 shows the structure of a diaphragm drive unit 44 according to a fourth embodiment of the present invention. FIG. 7A is a perspective view of the yoke plate 21 as viewed from the front side, and FIG. It is a fragmentary sectional view of drive unit 44 of the 4th example. The diaphragm driving unit 44 of the fourth embodiment is different from the diaphragm driving unit 41 of the first embodiment only in the structure of the yoke plate 21. Therefore, in the diaphragm driving unit 44 of the fourth embodiment, the same components as those of the diaphragm driving unit 41 of the first embodiment are denoted by the same reference numerals.

  In the diaphragm drive unit 44 of the fourth embodiment, as shown in FIGS. 7A and 7B, the permanent magnets 22 on the yoke plate 21 are all in the same direction, and in this embodiment, all the permanent magnets 22 are The south pole is disposed toward the yoke plate. A portion around the permanent magnet 22 bulges to the permanent magnet 22 side by substantially the same height as the permanent magnet 22 to form a bulging portion 21a. The bulging portion 21a has a lattice shape, and each permanent magnet 22 is surrounded by the bulging portion 21a.

  In the diaphragm drive unit 44 of the fourth embodiment, the lines of magnetic force do not flow from the permanent magnet 22 to the permanent magnet 22, but from the permanent magnet 22 to the bulging portion 21a of the yoke plate 21, as shown in FIG. It flows toward. The coil 27 is arranged in the direction perpendicular to the magnetic field in the lateral magnetic field. Also in the fourth embodiment, the coil 27 is provided in a position corresponding to each of the permanent magnets 22 of the coupler member 24, and has a side in a direction perpendicular to the magnetic force lines between the permanent magnets 22 in one plane. It is wound. Therefore, the coil 27 provided on the opposing surface of one permanent magnet 22 has a rectangular spiral shape. And as shown in FIG.7 (b), the electric current of a different direction flows into the adjacent edge | side of an adjacent coil.

  Therefore, as shown in FIG. 8, each coil 27 is connected in series with the inner winding start point being connected to the outer winding end point of the other coil 27 so that the winding direction is the same. The winding start point of the first coil 27 a is connected to the + terminal of the terminal plate 28, and the winding end point of the last coil 27 e is connected to the + terminal of the terminal plate 28. In this way, when current flows from the winding start point of the first coil 27s toward the winding end point of the last coil 27e, currents in different directions flow through the sides of the adjacent coils 27. The connection of the coil 27 in FIG. 8 is an example, and the connection between the coils 27 is not limited to this example.

  Thus, by providing the yoke plate 21 with the bulging portion 21a surrounding the permanent magnet 22 and forming the top surface 21b to the same height as the permanent magnet 22, the diaphragm drive unit 44 of the fourth embodiment can be obtained. Since the magnetic flux density generated by the permanent magnet 22 can be used effectively, the driving force of the coupler member 24 can be increased compared to the diaphragm driving unit 41 of the first embodiment.

  FIG. 9A shows the structure of the diaphragm drive unit 45 according to the fifth embodiment of the present invention, and FIG. 9B shows the structure of the modification. 9A and 9B show only a partial cross-sectional view of the diaphragm drive unit 45 of the fifth embodiment. The diaphragm driving unit 45 of the fifth embodiment is different from the diaphragm driving unit 41 of the first embodiment in that the coupler member 24 is omitted and the coil 27 is directly attached to the diaphragm 2. In the embodiment shown in FIG. 9A, the coil 27 is provided on the surface of the diaphragm 2, and in the embodiment shown in FIG. 9B, the coil 27 is embedded in the diaphragm 27.

  The configuration of the yoke plate 21, the permanent magnet 22, the leaf spring 23, and the sleeve 26 in the diaphragm drive unit 45 of the fifth embodiment is exactly the same as that of the diaphragm drive unit 41 of the first embodiment. Are given the same reference numerals and their description is omitted. The arrangement pattern of the coils 27 may be the same as the pattern shown in FIG.

  Thus, by omitting the coupler member 24, the diaphragm driving unit 45 of the fifth embodiment can reduce the number of components and increase the sound pressure by reducing the weight.

  FIG. 10A shows a speaker configured by attaching the diaphragm 2 to the diaphragm driving unit 46 of the sixth embodiment of the present invention, and FIG. 10B shows the book shown in FIG. The speaker which comprised the diaphragm 2 to the diaphragm drive unit 46a of the modification of 6th Example of invention is shown.

  The diaphragm driving unit 46 of the sixth embodiment shown in FIG. 10A is a yoke plate having exactly the same structure on the coupler member 24 of the diaphragm driving unit 41 of the second embodiment of the present invention described in FIG. 21 and the permanent magnet 22 are turned upside down and attached using a leaf spring 23, a sleeve 26 and a screw 25. The arrangement pattern of the coils 27 may be the same as the pattern shown in FIG. Further, since the diaphragm 2 cannot be attached to the coupler member 24 in this state, the coupler member 24 is provided with an extension 24e, and the diaphragm 2 is attached to the extension 24 using the sleeve 20 and the screw 19. ing.

  As described above, the yoke plate 21 and the permanent magnet 22 having exactly the same configuration are turned upside down on the coupler member 24 of the diaphragm drive unit 41 of the second embodiment of the present invention, and the leaf spring 23, the sleeve 26, and the screw 25 are turned upside down. In the diaphragm drive unit 46 of the fifth embodiment attached using the same, the same poles of the permanent magnet 22 face each other. As a result, the magnetic field in the vertical direction from the permanent magnet 22 becomes a repulsive magnetic field, so that the magnetic field is deflected in the lateral direction and the magnetic field in the lateral direction becomes stronger. Therefore, the magnetic flux passing through the coil 27 is increased, and the magnetic flux can be efficiently used and the driving force is increased.

  The vibration plate driving unit 46a of the modification of the sixth embodiment shown in FIG. 10B is a coupler provided with a coil 27, as compared with the vibration plate driving unit 46 of the sixth embodiment shown in FIG. The only difference is that the coil 27 is similarly disposed on the surface opposite to the surface of the member 24. The arrangement pattern of the coil 27 added to the coupler member 27 may be the same as the pattern shown in FIG. In the diaphragm drive unit 46a of this modification, the number of the coils 27 is increased, so that the magnetic flux can be used more efficiently than the diaphragm drive unit 46 of the sixth embodiment, and the driving force is further increased.

  In the first to sixth embodiments of the present invention described above, nine permanent magnets 22 are arranged on the yoke plate 21, and the same number is provided on the coupler member 24 or the diaphragm 2 side correspondingly. However, the number of permanent magnets 22 and the number of corresponding coils 27 may be appropriately determined according to the driving force required to drive the diaphragm 2.

  Further, in the first to sixth embodiments, the leaf spring 23 that elastically supports the coupler member 24 is provided with four arms. However, the number of arms of the leaf spring 23 and the shape of the arms are different. What is necessary is just to determine suitably according to the shape of the speaker to perform. For example, if the shape of the diaphragm of the speaker is a disc shape, a three-arm plate spring 17 used in the conventional apparatus shown in FIG. 1 may be used as the plate spring. However, regardless of the number of arms of the leaf spring 23 and the shape of the arms, it is desirable that the stroke amount under a constant load applied to each arm is the same, and when the arm length is different, the width and thickness of the arm are different. Change and adjust.

  FIG. 11 shows an example in which the elastic coefficient of the leaf spring 23 is changed. FIG. 11A shows an embodiment in which a hole 23d is formed in the arm portion 23a of the leaf spring 23, and FIG. Is an embodiment in which a weight 3 is attached to an arm portion 23 a of a leaf spring 23. In addition, spacers having various shapes and areas may be sandwiched between the arm portion 23 a of the leaf spring 23 and the coupler member 23. Thus, if the elastic coefficient of the leaf spring 23 is changed, the frequency characteristics and the minimum limit frequency f0 of the diaphragm drive unit can be controlled.

  Further, as shown in the diaphragm drive unit 47 of the seventh embodiment of the present invention shown in FIG. 12, a screwing hole 30 is provided in the arm portion 23a of the leaf spring 23, and the screwing hole 30 of the coupler member 24 corresponds to this screwing hole 30. The stroke of the arm portion 23a of the leaf spring 23 can also be changed by providing a screwing hole 31 at a position where the two screwing holes 30, 31 are connected by a screw 25 and a sleeve 26. . Thus, if the stroke of the leaf spring 23 is changed, the frequency characteristics of the diaphragm drive unit 47 and the minimum limit frequency f0 can be controlled.

  As still another embodiment for changing the stroke of the leaf spring 23, the sleeve 26 provided adjacent to the first sleeve 26a is replaced by a diaphragm drive unit 48 of the eighth embodiment shown in FIG. 13A. The second sleeve 26b is divided into two parts, and a link plate 32 as shown in FIG. 13 (b) is inserted between them, and the link plate 32 and the coupler member 24 are substantially as shown in FIG. 13 (a). The stroke of the arm portion 23a can be changed by sandwiching it with the U-shaped clamper 33. In the diaphragm drive unit 48 of the eighth embodiment, the minimum limit frequency f0 can be controlled by changing the clamping position of the clamper 33.

  Furthermore, the pattern of the coil 27 used in the embodiment described above is wound in one plane so as to have a side in a direction perpendicular to the magnetic field lines between the permanent magnets. However, it is difficult for magnetic flux to flow in the corners of the coil pattern. Therefore, in the present invention, as shown in FIG. 14, the corner is formed in an arc shape (the R portion is formed in the corner), and the corner is inserted into the magnetic field. Thus, by forming R at the corners of the winding pattern of the coil 27, the magnetic flux can be used efficiently and the driving force is increased.

  By the way, it is known that when a driving signal such as an acoustic signal is supplied to the diaphragm driving unit or the speaker of the first to eighth embodiments described above, Joule heat is generated from the coil by the current flowing through the coil. Yes. When a large input current flows through the coil, the physical properties of the resin diaphragm may change due to heat, which may affect the sound quality. Therefore, it is necessary to efficiently diffuse the Joule heat generated from the coil to suppress the heat generation from the diaphragm drive unit.

  FIGS. 15A and 15B show the structure of a diaphragm drive unit 49 according to the ninth embodiment of the present invention. The first embodiment of the present invention described in FIGS. The heat radiating sheet 4 is attached as a heat radiating member to the surface of the coupler member 24 of the diaphragm drive unit 41 of the embodiment opposite to the surface on which the coil 27 is installed. Therefore, the same components are denoted by the same reference numerals, and the description thereof is omitted. As the heat dissipating sheet 4, a copper sheet, an aluminum sheet, a filler mixed conductive sheet, or the like can be used. When the diaphragm 2 is attached to the diaphragm driving unit 49, the heat dissipation sheet 4 is sandwiched between the diaphragm 2 and the coupler member 24.

  FIGS. 16A and 16B show the structure of the diaphragm drive unit 50 according to the tenth embodiment of the present invention. The first embodiment of the present invention described with reference to FIGS. The heat dissipation sheet 4 is attached as a heat dissipation member to the surface of the coupler member 24 of the diaphragm drive unit 41 of the embodiment where the coil 27 is installed, and the coil 27 is disposed on the heat dissipation sheet 4. It is. Therefore, the same components are denoted by the same reference numerals, and the description thereof is omitted. A copper sheet, an aluminum sheet, a filler-mixed conductive sheet or the like can also be used for the heat radiating sheet 4.

  FIGS. 17A to 17D show the structure of the diaphragm drive unit 51 according to the eleventh embodiment of the present invention. The first embodiment of the present invention described with reference to FIGS. The heat sink 5 having a large number of fins 5a as a heat radiating member is attached to the surface of the coupler member 24 of the diaphragm drive unit 41 of the embodiment opposite to the surface on which the coil 27 is installed. Therefore, the same components are denoted by the same reference numerals, and the description thereof is omitted. Between the heat sink 5 and the coupler member 24, silicon grease for increasing thermal conductivity is applied.

  The heat sink 5 can be formed of a light metal such as aluminum. The diaphragm 2 attached to the diaphragm driving unit 51 of the eleventh embodiment is formed with slits 2a that match the shape of the fins 5a. FIG. 17B shows a state where the diaphragm 2 is attached to the diaphragm driving unit 51, and FIG. 17C shows the shape of the fin 5 a of the heat sink 5. FIG. 17D shows a modified example of the heat sink 5, which is an example in which a large number of square pillar-shaped heat radiation protrusions 5 b are provided.

  FIGS. 18A and 18B show the structure of a diaphragm driving unit 52 according to the twelfth embodiment of the present invention. The diaphragm drive unit 52 of the twelfth embodiment is provided with the permanent magnet 22 of the yoke plate 21 of the diaphragm drive unit 50 of the tenth embodiment of the present invention described with reference to FIGS. The heat sink 5 provided with many fins 5a as a heat radiating member is attached to the surface opposite to the surface. Therefore, the same components are denoted by the same reference numerals, and the description thereof is omitted. Between the heat sink 5 and the yoke plate 21, silicon grease is applied to increase thermal conductivity.

  Then, both end portions of the heat radiation sheet 4 laminated between the coil 27 and the coupler member 24 are extended, and the free ends of the extension portions 4 a are connected to the side surfaces of the heat sink 5 attached to the yoke plate 21. As a result, the heat generated in the coil 27 is transmitted to the heat sink 5 through the heat radiating sheet 4 and the extension 4 a, and is radiated from the heat sink 5. In this embodiment, the extended portions 4a of the heat radiating sheet 4 are provided on the two opposite sides of the heat radiating sheet 4, but the extended portions 4a may be provided on any side of the heat radiating sheet 4, and are provided on at least one side and the maximum four sides. be able to. In this embodiment, the heat radiating sheet 4 is provided with the extension 4 a and connected to the heat sink 5. However, a heat radiating member separate from the heat radiating sheet 4 may be attached between the heat radiating sheet 4 and the heat sink 5. . Examples of the heat radiating member include a copper braided wire.

  The diaphragm driving unit of the present invention and the speaker using the diaphragm driving unit have been described above based on some embodiments. The diaphragm drive unit of the present invention is composed of a drive unit that is a magnetic circuit composed of a yoke plate and a magnet, and a movable unit including a coupler member and a coil supported by a plate spring on the drive unit. The sound pressure generated by the ratio of the weight of the part and the weight of the drive part changes. For example, when the weight ratio between the movable part and the drive part is 0.3 or less, the weight of the drive part becomes excessive, and the sound pressure decreases. On the contrary, when the weight ratio of the movable part and the drive part is 3 or more, the weight of the movable part becomes excessive, and the sound pressure also decreases. Therefore, if the weight ratio of the movable part and the drive part is kept between 0.3 and 3, it is possible to prevent a decrease in sound pressure. As a result of the experiment, the optimum weight ratio between the movable part and the drive part at which the sound pressure becomes high is in the range of 0.8 to 1.4 in which the action and reaction coins work effectively. In consideration of this weight balance, it is only necessary to determine whether the heat sink is attached to the coupler member side or the yaw plate side.

1 shows a structure of a conventional diaphragm drive unit, (a) is a side view including a partial cross section of the drive unit attached to the diaphragm, and (b) is a diagram of the diaphragm drive unit of (a) from the back side. It is the bottom view seen. FIG. 2 shows a first embodiment of the diaphragm drive unit of the present invention, where (a) is a perspective view of the drive unit, and (b) is a partial sectional view of the drive unit of the first embodiment. It is an assembly drawing which shows the assembly method of the drive unit shown to Fig.1 (a). It is a figure which shows an example of arrangement | positioning of the coil laid in the coupler member used for the diaphragm drive unit of this invention. FIG. 2 shows a second embodiment of the diaphragm drive unit of the present invention, where (a) is a perspective view of the coupler member and the sleeve of the drive unit as seen from the back side, and (b) is the drive unit of the second embodiment. FIG. FIG. 7 shows a third embodiment of the diaphragm drive unit of the present invention, where (a) is a perspective view of the coupler member and the sleeve of the drive unit as seen from the front side, and (b) is the drive unit of the third embodiment. FIG. 4 shows a fourth embodiment of the diaphragm drive unit of the present invention, where (a) is a perspective view of the yoke plate of the drive unit as seen from the front side, and (b) is a partial cross section of the drive unit of the fourth embodiment. FIG. It is a figure which shows another example of arrangement | positioning of the coil laid in the coupler member used for the diaphragm drive unit of this invention. (A) is a partial sectional view of a speaker using the fifth embodiment of the diaphragm driving unit of the present invention, and (b) is a portion of the speaker using a modification of the fifth embodiment of the diaphragm driving unit of the present invention. It is sectional drawing. (A) is a partial sectional view of a speaker using the sixth embodiment of the diaphragm driving unit of the present invention, and (b) is a portion of the speaker using a modification of the sixth embodiment of the diaphragm driving unit of the present invention. It is sectional drawing. The modification of the leaf | plate spring used by this invention is shown, (a) is the modification which provided the some hole in the arm part of a leaf | plate spring, (b) attaches a plate to the arm part of a leaf | plate spring. The modification is shown. It is a perspective view which shows the structure of 7th Example of the diaphragm drive unit of this invention. The structure of 8th Example of the diaphragm drive unit of this invention is shown, (a) is a side view of a drive unit, (b) is the plane of the link plate used for 8th Example of a diaphragm drive unit. FIG. Another example of the winding shape of the coil used for the diaphragm driving unit of the present invention is shown. The structure of 9th Example of the diaphragm drive unit of this invention is shown, (a) is a side view of a diaphragm drive unit, (b) is the diaphragm drive unit of (a), and the heat dissipation attached to this. It is a perspective view which shows a sheet | seat. The structure of the 10th Example of the diaphragm drive unit of this invention is shown, (a) is a perspective view of a diaphragm drive unit, (b) is a side view of the diaphragm drive unit of (a). The structure of the 11th Example of the diaphragm drive unit of this invention is shown, (a) is a side view of a diaphragm drive unit and a diaphragm, (b) is a diaphragm in the diaphragm drive unit of (a). The side view which shows the state which attached A, (c) is a perspective view which shows an example of a heat sink, (d) is a perspective view which shows another example of a heat sink. The structure of 12th Example of the diaphragm drive unit of this invention is shown, (a) is a side view of a diaphragm drive unit, (b) is a perspective view of the diaphragm drive unit of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Diaphragm 4 Heat dissipation sheet 5 Heat sink 21 York plate 22 Permanent magnet 23 Leaf spring 24 Coupler member 25 Screw 26 Sleeve 27 Coil 32 Link plate 33 Clamper 41-52 The diaphragm drive unit or speaker of the Example of this invention

Claims (23)

The yoke plate,
On the yoke plate, a plurality of permanent magnets arranged so that the polarities of the adjacent permanent magnets are opposite to each other,
A coupler member that is disposed at a position facing the yoke plate at a predetermined distance from the top surface of the permanent magnet, and can be attached with a diaphragm on the surface opposite to the yoke plate;
An elastic body provided around the yoke plate and elastically supporting the coupler member; and
A coil of the coupler member provided at a position corresponding to each of the permanent magnets and wound in a plane so as to have a side perpendicular to a magnetic force line between the permanent magnets;
Each of the coils is connected in series so that the inner winding start point is connected to the outer winding end point of the other coil, and from the winding start point of the first coil to the last winding end point of the last coil. When the current flows, the diaphragm drive unit is connected so that currents in the same direction flow between the sides of the adjacent coils. The diaphragm drive unit according to claim 1,
The surface of the coupler member facing the permanent magnet, the surface facing the peripheral portion of the permanent magnet is bulged by the same height,
The diaphragm driving unit according to claim 1, wherein the coil is disposed in the bulging portion. The diaphragm drive unit according to claim 1,
A through hole into which the permanent magnet can be inserted when the coupler member moves to the yoke plate side is provided in a portion of the coupler member facing the permanent magnet,
The diaphragm drive unit according to claim 1, wherein the coil is disposed in a portion around the through hole. A yoke plate, a plurality of permanent magnets arranged with the same polarity on the yoke plate, and a portion of the yoke plate surrounding the permanent magnet so as to surround the permanent magnet, the same degree as the permanent magnet. A magnetic circuit having a bulging portion bulged to a height;
A coupler member that is disposed at a position facing the yoke plate at a predetermined distance from the top surface of the permanent magnet, and can be attached with a diaphragm on the surface opposite to the yoke plate;
An elastic body provided around the yoke plate and elastically supporting the coupler member; and
A coil of the coupler member provided at a position corresponding to each of the permanent magnets and wound in a plane so as to have a side perpendicular to a magnetic force line between the permanent magnets;
Each of the coils is connected in series so that the inner winding start point is connected to the outer winding end point of the other coil, and from the winding start point of the first coil to the last winding end point of the last coil. When the current flows, the diaphragm drive unit is connected so that currents in different directions flow between the sides of adjacent coils. Two yoke plates,
A plurality of permanent magnets arranged on opposite surfaces of the two yoke plates so as to be opposite in polarity to the adjacent permanent magnets;
A predetermined distance from the top surface of the permanent magnet is arranged at a middle position between the two yoke plates, and a diaphragm can be attached to one outer side of the two yoke plates via a mounting member. A coupler member,
An elastic body provided around each of the two yoke plates, and elastically supporting the coupler member on an intermediate portion of the two yoke plates; and
A coil that is provided in a position corresponding to each of the permanent magnets on one surface of the coupler member and wound in one plane so as to have a side in a direction perpendicular to the magnetic field lines between the permanent magnets; With
Each of the coils is connected in series so that the inner winding start point is connected to the outer winding end point of the other coil, and from the winding start point of the first coil to the last winding end point of the last coil. When the current flows, the diaphragm drive unit is connected so that currents in the same direction flow between the sides of the adjacent coils. The diaphragm drive unit according to claim 5,
The diaphragm driving unit, wherein the coil is also provided on the other surface of the coupler member. The diaphragm drive unit according to any one of claims 1 to 6,
An elastic body that elastically supports the coupler member includes a base portion fixed to the yoke plate, and an arm portion extending from the base portion along the periphery of the yoke plate,
The diaphragm driving unit, wherein the coupler member is elastically supported at the tip of the arm portion. The diaphragm drive unit according to claim 7,
The number and shape of the arm portions are determined by the shape and size of the diaphragm. The diaphragm drive unit according to claim 7 or 8,
The vibration plate driving unit is characterized in that the elastic coefficient of the arm part is changed by at least one of the method of attaching irregularities to the arm part, making a hole, and attaching a heavy object to the arm part. The diaphragm drive unit according to any one of claims 7 to 9,
The diaphragm driving unit, wherein the coupler member and the arm portion are coupled to each other by a mounting member and a screw. It is a diaphragm drive unit of Claim 10, Comprising:
A link member is stretched between adjacent mounting members, and the elastic coefficient of the arm portion is changed by connecting the link member and the elastic body with a clamp member at a predetermined position. Diaphragm drive unit. The diaphragm drive unit according to any one of claims 1 to 6,
An elastic body that elastically supports the coupler member includes a base portion fixed to the yoke plate, and an arm portion extending from the base portion along the periphery of the yoke plate,
The diaphragm driving unit is characterized in that the coupler member is coupled to the arm portion at a distal end portion, and is coupled and elastically supported at a position away from the distal end portion by a predetermined distance.   The diaphragm drive unit according to any one of claims 1 to 12, wherein a corner portion of the wound coil is bent into an arc shape. The diaphragm drive unit according to any one of claims 1 to 13,
The diaphragm drive unit according to claim 1, wherein the permanent magnet has a rectangular cross section in a direction perpendicular to the magnetization direction. The diaphragm drive unit according to any one of claims 1 to 14,
The diaphragm drive unit, wherein the coupler member includes a heat dissipation structure that dissipates heat generated in the coil. The diaphragm drive unit according to claim 15,
The diaphragm drive unit, wherein the heat dissipation structure is a heat dissipation sheet laminated on a surface of the coupler member opposite to the coil installation surface. The diaphragm drive unit according to claim 15,
The diaphragm driving unit, wherein the heat dissipation structure is a heat dissipation sheet laminated between the coil installation surface of the coupler member and the coil. The diaphragm drive unit according to claim 15,
The diaphragm drive unit, wherein the heat dissipation structure is a heat sink attached to a surface of the coupler member opposite to the coil installation surface. The diaphragm drive unit according to claim 17,
Further, a heat sink is attached to a surface of the yoke plate opposite to the attachment surface of the permanent magnet, and the heat radiating sheet and the heat sink are connected by a heat conducting member. Drive unit. The diaphragm drive unit according to any one of claims 1 to 19,
The weight ratio between the total weight of the movable part of the diaphragm driving unit including the elastic body and the total weight of the driving part excluding the movable part of the diaphragm driving unit is between 0.3 and 3.0. A diaphragm drive unit characterized by that.   21. The diaphragm driving unit according to claim 1, wherein a diaphragm is attached to the coupler member directly or via a vibration transmitting member. Thin speaker used.   2. A thin speaker using the diaphragm driving unit according to claim 1, wherein the coupler member is replaced by a diaphragm, and the diaphragm is directly driven by the diaphragm driving unit. . A thin speaker using the diaphragm drive unit according to claim 22,
A thin speaker using the diaphragm driving unit, wherein the coil is embedded in the diaphragm.

Images