JP2009159009A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker for improving acoustic characteristics by suppressing divided vibration of a diaphragm. <P>SOLUTION: The speaker has a magnetic circuit section, a vibration section, and a frame. The vibration section has a diaphragm 21 vibrated by the magnetic circuit section and an edge 20 with an inner edge section mounted on the diaphragm 21 and an outer edge section mounted on the frame. In the diaphragm 21, a plurality of ribs 22 for improving stiffness at a junction section are provided with gaps along the circumferential direction of the diaphragm 21 at a junction section to the edge 20, and are formed with inclination of a prescribed angle with respect to the radial direction of each diaphragm 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a speaker that generates sound by vibrating a diaphragm when supplied with, for example, an audio current.

  For example, various speakers (for example, refer to Patent Document 1) are conventionally mounted on an automobile as a moving body. The speaker disclosed in Patent Document 1 includes a bottomed cylindrical frame, a vibration unit housed in the frame, and a magnetic circuit unit to which the frame is attached and generates a driving force in the vibration unit. I have.

  The vibration unit includes a voice coil to which an audio current is supplied, a diaphragm that vibrates by a driving force of the voice coil, and an edge that connects the frame and the diaphragm. The driving force refers to an electromagnetic force (also referred to as Lorentz force) generated when a voice current is passed through the voice coil.

  The edge is made of a flexible material and is formed in an annular shape. The edge has an inner edge portion attached to the outer edge portion of the diaphragm, and an outer edge portion attached to the frame to support the diaphragm so that the diaphragm can be displaced.

  The magnetic circuit unit includes a permanent magnet, and a voice coil is disposed in the magnetic gap.

In the speaker having the above-described configuration, when a voice current is supplied to the voice coil and an electromagnetic force (Lorentz force) acts on the voice coil, the diaphragm is vibrated to generate a sound corresponding to the voice current. Generate in the direction of acoustic radiation.
JP 2002-271887 A

  In the speaker having the configuration described above, an adhesive is applied between the outer edge portion of the diaphragm and the inner edge portion of the edge, the outer edge portion of the diaphragm and the inner edge portion of the edge are overlapped, and the diaphragm and the edge are mutually connected. It was fixed. In such a configuration, the rigidity of the portion where the edge is not overlapped is lower than that of the portion where the edge of the diaphragm is overlapped, so that the rigidity of the diaphragm changes abruptly at the boundary. Since the boundary where the rigidity of the diaphragm changes abruptly extends over the entire circumference of the diaphragm, split vibrations that move upside down are likely to occur on both sides of the boundary. There was a problem of deteriorating acoustic characteristics.

  This invention makes it an example of a subject to cope with such a problem. An object of the present invention is to provide a loudspeaker capable of improving acoustic characteristics by suppressing, for example, vibrations of a diaphragm.

  In order to solve the problems and achieve the object, the speaker according to the first aspect of the present invention is a vibration that is vibrated by a frame, a magnetic circuit unit supported by the frame, and a voice coil to which an audio current is supplied. And a vibration part having an edge with an inner edge attached to the diaphragm and an outer edge attached to the frame. A plurality of ribs for increasing rigidity are provided at intervals along the circumferential direction of the diaphragm, and the plurality of ribs are inclined at a predetermined angle with respect to the radial direction of the diaphragm. It is characterized by being formed.

  Hereinafter, a speaker according to an embodiment of the present invention will be described. In a speaker according to an embodiment of the present invention, a rib for increasing the rigidity of the joint is formed at a joint with the edge of the diaphragm at a predetermined angle with respect to the radial direction of the diaphragm, and By providing a plurality of the diaphragms at intervals along the circumferential direction of the diaphragm, by changing the rigidity of the diaphragm between a place where the rib of the diaphragm is formed and a place where the rib is not formed, the diaphragm It is possible to disperse the boundary where the rigidity of the abruptly changes. Therefore, when the diaphragm vibrates, the divided vibration generated at the boundary where the rigidity of the diaphragm suddenly changes can be suppressed, and the entire diaphragm has a sharp peak or valley (peak dip) in its sound pressure frequency characteristics. It is possible to suppress the occurrence of abnormal sounds such as that seen as).

  In addition, among the plurality of ribs, at least two ribs different in at least one of length, height, and thickness may be provided. In this case, since the rigidity is not uniform in the circumferential direction, it is possible to further suppress the divided vibration that occurs at the boundary where the rigidity of the diaphragm suddenly changes when the diaphragm vibrates.

  Furthermore, a plurality of ribs may be arranged so that a plurality of locations having lower rigidity than other portions are formed at intervals in the circumferential direction of the diaphragm at the junction with the edge of the diaphragm. In this case, since the rigidity becomes more uneven with respect to the circumferential direction, it is possible to further suppress the divided vibration generated at the boundary where the rigidity of the diaphragm suddenly changes when the diaphragm vibrates.

  Moreover, you may arrange | position a some rib so that the planar shape formed by connecting the some location with low rigidity may become an odd-numbered square. In this case, since the rigidity is further non-uniform in the circumferential direction, it is possible to further suppress the divided vibration generated at the boundary where the rigidity of the diaphragm suddenly changes when the diaphragm vibrates.

  An embodiment of the present invention will be described with reference to FIGS. A speaker 1 according to an embodiment of the present invention is mounted on an automobile or the like as a moving body, and provides audio information to passengers of the automobile.

  As shown in FIG. 1, the speaker 1 includes a frame 4, a magnetic circuit unit 2, and a vibrating unit 3 that generates a sound when vibrated by the magnetic circuit unit 2.

  The frame 4 is made of a thick sheet metal. The frame 4 includes an annular bottom portion 6, a main body portion 7 that is continuous so as to rise from the outer peripheral edge of the bottom portion 6, and has a truncated cone-shaped appearance, and the main body portion 7 from the outer edge of the main body portion 7. And a flange portion 8 extending outward.

  The main body 7 is formed in a cylindrical shape. The main body 7 has a flat terminal portion 9 attached so as to protrude outward from the main body 7. The terminal unit 9 is connected to an external device such as an amplifier. The terminal unit 9 is supplied with audio current from an external device such as an amplifier. The flange portion 8 is formed in an annular shape and is provided over the entire periphery of the main body portion 7 along the outer edge of the main body portion 7.

  As shown in FIG. 1, the magnetic circuit unit 2 includes a yoke 10 made of a magnetic material (so-called paramagnetic material or ferromagnetic material), a magnet 11, and a magnetic material (so-called paramagnetic material or ferromagnetic material). ). The yoke plate 12 is provided. The yoke 10 is an outer magnet type magnetic circuit integrally including an annular bottom plate 13 and a cylindrical center pole 14 erected from the center inner edge of the bottom plate 13.

  In this embodiment, an external magnetic type magnetic circuit is disclosed. However, the present invention is an internal magnetic type magnetic circuit or a magnetic circuit using both an internal magnetic type and an external magnetic type (a magnet is arranged inside and outside the voice coil bobbin). Magnetic circuit) may be applied. In this embodiment, the center pole has an opening that leads to the outside of the speaker device. However, in the present invention, the opening may not be formed.

  The magnet 11 is formed in an annular shape. The inner diameter of the magnet 11 is larger than the outer diameter of the center pole 14. The magnet 11 is superimposed on the bottom plate 13 through the center pole 14 on the inside. The magnet 11 described above may be excited by a permanent magnet or a DC power source.

  The yoke plate 12 is formed in an annular shape. The inner diameter of the yoke plate 12 is larger than the outer diameter of the center pole 14. The yoke plate 12 is superposed on the magnet 11 in a state where a center pole 14 of the yoke 10 and a voice coil bobbin 16 described later are passed inside. Further, the yoke plate 12 is fixed to the frame 4 with an adhesive or the like with the bottom 6 of the frame 4 overlapped. Of course, the yoke plate 12 is arranged coaxially with the frame 4.

  The yoke 10, the magnet 11, and the yoke plate 12 described above are arranged coaxially with each other. For this reason, the inner peripheral surfaces of the magnet 11 and the yoke plate 12 are spaced from the outer peripheral surface of the center pole 14 of the yoke 10.

  With the configuration described above, the magnetic circuit unit 2 drives the diaphragm 21 between the outer peripheral surface of the center pole 14 of the yoke 10 and the inner peripheral surface of the yoke plate 12 in cooperation with the voice coil 15 described later ( A magnetic gap G that generates a magnetic force for vibration) is formed. That is, the magnetic circuit unit 2 vibrates the diaphragm 21 in cooperation with the voice coil 15.

  The vibration part 3 is accommodated (supported) in the main body part 7 of the frame 4. The vibration unit 3 includes a voice coil 15, a voice coil bobbin 16, a damper 17, a center cap 18, an edge 20, a diaphragm 21, and the like.

  The voice coil 15 is disposed in the above-described magnetic gap G of the magnetic circuit unit 2. A tinsel wire 19 is connected to the voice coil 15. One end of the tinsel wire 19 is connected to the voice coil 15 by soldering or the like on the outer peripheral surface of the voice coil bobbin 16 and the other end is connected to the terminal portion 9 described above. A voice current is supplied to the voice coil 15 via the tinsel wire 19 or the like.

  The voice coil bobbin 16 is formed in a cylindrical shape. The voice coil bobbin 16 has an inner diameter that is larger than the outer diameter of the center pole 14 of the yoke 10 and an outer diameter that is smaller than the inner diameter of the yoke plate 12. The voice coil bobbin 16 is arranged coaxially with the yoke 10, the yoke plate 12, the voice coil 15, and the like.

  The voice coil bobbin 16 has one end 16a in the axial direction inserted into the magnetic gap G, and the voice coil 15 is attached (wound) around the outer periphery of the one end 16a. The voice coil bobbin 16 is supported by the yoke 10 so as to be movable along the axis P of the yoke 10 (indicated by a one-dot chain line in FIG. 2). The shaft core P is the shaft core of the speaker 1, and is the vibration direction of the vibration plate 21, that is, the vibration unit 3.

  The damper 17 is made of an insulating material, and is formed in an annular shape and a thin plate shape. The damper 17 has an inner edge attached to the other end 16 b of the voice coil bobbin 16 and an outer edge attached to the inner peripheral surface of the main body 7 of the frame 4. The damper 17 allows the voice coil bobbin 16, that is, the diaphragm 21 to vibrate along the axis P described above, and gradually attenuates the vibration of the voice coil bobbin 16, that is, the diaphragm 21.

  The center cap 18 is made of a thin plate resin. The center cap 18 is formed in a circular arc shape whose planar shape is circular and whose cross-sectional shape is convex toward the acoustic radiation direction. The center cap 18 looks like the voice coil bobbin 16 is closed, and the outer edge portion is attached to the diaphragm 21 and the voice coil bobbin 16.

  The edge 20 is made of an elastic material such as rubber or resin. The edge 20 is formed in a circular arc shape whose planar shape is annular and whose cross-sectional shape is convex toward the acoustic radiation direction. The edge 20 is attached (joined) to the flange portion 8 of the frame 4 by an adhesive or the like at the outer edge portion. The edge 20 is overlapped with an outer surface 21a on the acoustic emission side of an outer edge portion described later of the diaphragm 21, and is joined to the diaphragm 21 with an adhesive or the like. That is, the edge 20 is disposed so as to surround the diaphragm 21.

  The aforementioned edge 21 has an outer edge portion attached to the flange portion 8 of the frame 4 and an inner edge portion attached to the outer edge portion of the diaphragm 21, and the voice coil bobbin 16, that is, the diaphragm 21 extends along the axis P described above. The vibration of the voice coil bobbin 16, that is, the diaphragm 21 is gradually attenuated.

  The diaphragm 21 is made of a synthetic resin, and as shown in FIG. 1, the outer appearance is formed in an annular shape having a truncated cone shape (conical frustum shape). The diaphragm 21 is arranged coaxially with the center cap 18, that is, the yoke 10 and the like. The inner edge of the diaphragm 21 is fixed to the other end 16b of the voice coil bobbin 16 with an adhesive or the like.

  The diaphragm 21 is joined to the edge 20 by an adhesive or the like with the inner edge portion of the edge 20 overlapped on the outer surface 21a of the outer edge portion on the acoustic radiation side. In other words, the diaphragm 21 is attached to the flange portion 8, that is, the frame 4 through the edge 20 at the outer edge portion. The diaphragm 21 is attached to the frame 4 so as to be displaceable along the central axis direction of the speaker 1 by elastically deforming the edge 20. In addition, a rib 22 formed integrally with the diaphragm 21 is provided at a joint portion 21 c with the edge 20 of the outer edge portion of the diaphragm 21.

  The rib 22 is formed in a convex shape from the back surface 21b (surface on the back side of the outer surface 21a) opposite to the acoustic radiation side of the diaphragm 21. As shown in FIG. 2, the rib 22 extends linearly from the outer peripheral edge of the diaphragm 21 toward the inside. The ribs 22 are formed in a trapezoidal shape when viewed from the side. A plurality of ribs 22 are provided at intervals along the circumferential direction of the diaphragm 21. Each of the plurality of ribs 22 is formed to be inclined at a predetermined angle with respect to the radial direction of the diaphragm 21. And the location in which the some rib 22 of the junction location 21c with the edge 20 of the diaphragm 21 was formed has high rigidity.

  In addition, the plurality of ribs 22 are provided with a plurality (three in the illustrated example) of the minimum ribs 22 a having the smallest length among the plurality of ribs 22. The plurality of minimum ribs 22a are spaced apart from each other along the circumferential direction of the diaphragm 21, and the planar shape formed by connecting the plurality of minimum ribs 22a is an odd-numbered square (in the illustrated example, a triangle). Is arranged. In the present embodiment, three minimum ribs 22a each having the smallest length are provided. However, the present invention is not limited to this, and may be an odd number.

  Further, the plurality of ribs 22 are formed such that the lengths of the other ribs 22b disposed between the plurality of minimum ribs 22a are gradually increased toward the center between the plurality of minimum ribs 22a. ing.

  The diaphragm 21 having the above-described configuration is provided with a plurality (three) of the minimum ribs 22 a having the smallest length among the plurality of ribs 22, so that the diaphragm 20 is connected to the edge 20 of the outer edge portion of the diaphragm 21. The locations where the rigidity is lowered in the joint portion 21c are arranged so that the planar shape formed by connecting the mutual portions in the circumferential direction of the diaphragm 21 is a triangle.

  In the speaker 1 configured as described above, a voice current is supplied to the voice coil 15, and the voice coil 15 disposed in the magnetic gap G vibrates along the axis P described above in accordance with the voice current. The voice coil bobbin 16 around which the voice coil 15 is wound vibrates along the axis P together with the vibration plate 21 and the like, and the vibration plate 15 vibrates to generate a sound corresponding to the sound current. As described above, the magnetic circuit unit 2 vibrates the vibration plate 21, that is, the vibration unit 3 to generate sound.

  According to the present embodiment, the rib 22 for increasing the rigidity of the joint portion 21c is formed at the joint portion 21c with the edge 20 of the diaphragm 21 at a predetermined angle with respect to the radial direction of the diaphragm 21. In addition, by providing a plurality of the diaphragms 21 at intervals along the circumferential direction of the diaphragm 21, the rigidity of the diaphragm 21 is increased between the portions where the ribs 22 are formed and the portions where the ribs 22 are not formed. By changing, the boundary where the rigidity of the diaphragm 21 changes rapidly can be dispersed. Therefore, when the diaphragm 21 vibrates, the divided vibration generated at the boundary where the rigidity of the diaphragm 21 changes abruptly can be suppressed, and the entire diaphragm 21 has a sharp peak or valley ( It is possible to suppress the occurrence of abnormal sounds, such as those seen as peak dip).

  In addition, according to the present embodiment, among the plurality of ribs 22, a plurality of the smallest ribs 22 a having the smallest length are provided at intervals in the circumferential direction of the diaphragm, and between the plurality of the smallest ribs 22 a. By forming the lengths of the other ribs 22b so as to gradually increase toward the center between the plurality of minimum ribs 22a, the rigidity of the diaphragm 21 in the circumferential direction is not uniform. Therefore, when the diaphragm 21 vibrates, the divided vibration generated at the boundary where the rigidity of the diaphragm 21 changes abruptly can be further suppressed.

  Furthermore, according to the present embodiment, a plurality of the smallest ribs 22a formed with the smallest length are arranged at intervals in the circumferential direction of the diaphragm 21, so that the joint portion 21c with the edge 20 of the diaphragm 21 is provided. Are formed at intervals in the circumferential direction of the diaphragm 21, the rigidity becomes more uneven with respect to the circumferential direction of the diaphragm 21. In this case, it is possible to further suppress the divided vibration that occurs at the boundary where the rigidity of the diaphragm 21 changes rapidly.

  In addition, according to the present embodiment, the edges of the diaphragm 21 are arranged by arranging the plurality of minimum ribs 22a having the smallest length so that the planar shape formed by connecting each other is an odd-numbered square. By making the planar shape formed by connecting a plurality of low rigidity portions of the joint portion 21c with the odd number 20 into an odd angle, the rigidity becomes even more uneven in the circumferential direction of the diaphragm 21. Therefore, when the diaphragm 21 vibrates, the divided vibration generated at the boundary where the rigidity of the diaphragm 21 changes abruptly can be further suppressed.

  In the above-described embodiment, the vibration unit 3 has the diaphragm 21 having an outer appearance having a truncated cone shape and an annular shape. However, in the present invention, the vibration unit 3 may be configured such that the vibration plate is formed in a flat plate shape, and the appearance attached to the vibration plate is a truncated cone shape and has an annular drive cone. In this embodiment, the diaphragm 21 is made of synthetic resin or the like. However, in the present invention, the diaphragm 21 may be made of a known material such as paper.

  In the embodiment described above, among the plurality of ribs 22, a plurality of the minimum ribs 22a having the smallest length are provided, and the other ribs 22b disposed between the plurality of the minimum ribs 22a are provided. The length is formed so as to increase gradually toward the center between the plurality of minimum ribs 22a. However, in the present invention, the heights or thicknesses of the plurality of ribs 22 may be different from each other, and the lengths, heights, and thicknesses of the plurality of ribs 22 may be different from each other. good.

  According to the embodiment described above, the following speaker 1 is obtained.

(Supplementary note) Frame 4;
A magnetic circuit unit 2 supported by the frame 4;
A vibration part 3 having a vibration plate 21 that vibrates by a driving force acting on a voice coil 15 to which a sound current is supplied, and an edge 20 that is provided so as to surround the vibration plate 21 and has an outer edge attached to the frame 4. In a speaker 1 comprising:
A plurality of ribs 22 for increasing the rigidity of the joint portion 21c are provided at a joint portion 21c with the edge 20 of the diaphragm 21 along the circumferential direction of the diaphragm 21, and spaced apart from each other.
The speaker 1, wherein the plurality of ribs 22 are inclined at a predetermined angle with respect to a radial direction of the diaphragm 21.

  According to the remarks, the rib 22 for increasing the rigidity of the joint portion 21c is formed at the joint portion 21c with the edge 20 of the diaphragm 21 at a predetermined angle with respect to the radial direction of the diaphragm 21, and Since a plurality of the diaphragms 21 are provided at intervals along the circumferential direction of the diaphragm 21, the rigidity of the diaphragm 21 is changed depending on where the ribs 22 are formed and where the ribs 22 are not formed. Thus, the boundary where the rigidity of the diaphragm 21 changes suddenly can be dispersed, so that when the diaphragm 21 vibrates, the divided vibration generated at the boundary where the rigidity of the diaphragm 21 changes suddenly is suppressed. be able to. Therefore, in the entire diaphragm 21, it is possible to suppress the occurrence of abnormal sounds such as those seen as sharp peaks and valleys (referred to as peak dip) in the sound pressure frequency characteristics.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

It is sectional drawing which shows the speaker concerning one Example of this invention. It is a perspective view which shows the diaphragm seen from the opposite side of the acoustic radiation direction of the speaker shown by FIG. FIG. 2 is a plan view of the diaphragm shown in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Speaker 2 Magnetic circuit part 3 Vibration part 4 Frame 15 Voice coil 20 Edge 21 Diaphragm 21c Joint location 22 Rib 22a Minimum rib 22b Other rib G Magnetic gap P Axis center

Claims (4)

Frame,
A magnetic circuit portion supported by the frame;
A diaphragm having a diaphragm that is vibrated by a voice coil to which a sound current is supplied, and an edge having an inner edge attached to the diaphragm and an outer edge attached to the frame;
In a speaker with
A plurality of ribs for increasing the rigidity of the joint portion are provided at intervals in the joint portion with the edge of the diaphragm along the circumferential direction of the diaphragm.
The speaker is characterized in that the plurality of ribs are formed at a predetermined angle with respect to the radial direction of the diaphragm.   The speaker according to claim 1, wherein at least two ribs having at least one of a length, a height, and a thickness among the plurality of ribs are provided.   The plurality of ribs are arranged so that a plurality of locations having lower rigidity than other portions are formed at intervals in the circumferential direction of the diaphragm at the joint locations. The speaker according to 1.   The speaker according to claim 3, wherein the plurality of ribs are arranged so that a planar shape formed by connecting the plurality of low-rigidity portions is an odd-numbered square.

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