CN1652634A

CN1652634A - Loudspeaker

Info

Publication number: CN1652634A
Application number: CN 200510000569
Authority: CN
Inventors: 前川孝治
Original assignee: Nippon Tokita Pioneer K K; Pioneer Corp
Current assignee: Nippon Tokita Pioneer K K; Pioneer Corp
Priority date: 2004-02-06
Filing date: 2005-01-07
Publication date: 2005-08-10
Also published as: JP2005223694A; JP4366203B2

Abstract

To provide a speaker in which a diaphragm can easily be formed and assembled. The speaker is provided with: the diaphragm 12; a magnet container part 12B formed on a diaphragm main body part 12A; a first frame 11 for supporting an outer circumferential part of the diaphragm 12 via an edge 13 in a vibration free way; a plate 15 concentrically inserted in the magnet container part 12B with the diaphragm 12; magnets 16A, 16B concentrically inserted into the plate 15 inserted in the magnet container part 12B with the diaphragm 12 and fixed to the plate 15; a second frame 14 for supporting the plate 15 and the magnets 16A, 16B; a first voice coil 17A wound in a ring form on the outer circumferential face in the inside of the magnet container part 12B and opposed to an inner circumferential face of the plate 15; and a second voice coil 17B wound in a ring form on the outer circumferential face in the inside of the magnet container part 12B and opposed to an outer circumferential face of the plate 15.

Description

Loud speaker

Technical field

The present invention relates to loud speaker and loud speaker and use the structure of vibrational system assembly with magnetic circuit, loud speaker.

Background technology

Fig. 1 shows the structure of the conventional thin loud speaker that for example uses in vehicle-mounted or mobile device etc.

The thin speaker of this Fig. 1 is that the magnet 2 with ring-type is installed on the 1A of outward flange portion of yoke 1, and then annular plate 3 is installed on this magnet 2, the outer peripheral face of the inner peripheral surface by making this flat board 3 and the center pole 1B of yoke 1 constitutes magnetic circuit across magnetic gap g and opposed.

And, roughly be the edge 5 that flat oscillating plate 4 is connected by the peripheral part with this oscillating plate 4 and supported by framework 6, the sound coil cylindraceous 7 of rear side that is installed on the connecting portion at oscillating plate 4 and edge 5 be embedded into dull and stereotyped 3 with the center pole 1B of yoke 1 between magnetic gap g interior (for example, with reference to patent documentation 1).

Above-mentioned thin speaker is owing to there is a following structure: will and the cylindric sound coil 7 that links into an integrated entity of oscillating plate 4 be inserted in dull and stereotyped 3 and the center pole 1B of yoke 1 between in the formed magnetic gap g, and make its in magnetic gap g axially (at Fig. 1, be above-below direction) vibration, so require that strict position relation is arranged between this sound coil 7 and the magnetic gap g.

Therefore, in above-mentioned existing loud speaker, produce following problem: the shaping difficulty of oscillating plate 4, when assembling, be difficult to sound coil 7 is inserted in the narrow magnetic gap g, be difficult to sound coil 7 is positioned in the magnetic gap g.

[patent documentation 1] spy opens the 2002-171596 communique

Summary of the invention

The problem that the present invention will solve in the above-mentioned conventional thin loud speaker solves one of problem as it.

In order to achieve the above object, the loud speaker of the 1st invention (the described invention of claim 1) is characterised in that, comprising: vibration component roughly in the form of annular discs; Being concentric annular with vibration component on the oscillating component of this vibration component extends and recessed portion of formation; Support the 1st framing component of the peripheral part of above-mentioned vibration component via edge member free vibration ground; Be configured as its internal diameter than the big required length of the diameter of the inboard inner peripheral surface of above-mentioned recessed portion and its external diameter than the ring-type of the little required length of the diameter of the outside inner peripheral surface of recessed portion, be inserted into recessed the planar plate members in the portion with vibration component with being concentric shape; Big and its external diameter is inserted in recessed the portion with vibration component with being concentric shape, and is fixed on the magnet member of planar plate members than the external diameter circlet shape of planar plate members than the internal diameter of this planar plate members to be configured as its internal diameter; The 2nd framing component of the assigned position in recessed portion with above-mentioned planar plate members and magnet member supports; On the inboard outer peripheral face of above-mentioned recessed portion, be rolled into ring-type, with the inner peripheral surface that is supported on recessed the planar plate members in the portion across the wall portion of recessed portion and opposed the 1st sound coil member; And on the outer peripheral face of the outside of above-mentioned recessed portion, be rolled into ring-type, with the outer peripheral face that is supported on recessed the planar plate members in the portion across the wall portion of recessed portion and opposed the 2nd sound coil member.

In order to achieve the above object, the loud speaker of the 2nd invention (the described invention of claim 14) is characterised in that with magnetic circuit: two ring-type neodium magnets are respectively with the magnetic pole and the contacted state of planar plate members of same side, are fixed on the both sides of annular plate member with planar plate members with being concentric shape.

In order to achieve the above object, the loud speaker of the 3rd invention (the described invention of claim 16) is characterised in that with the vibrational system assembly, comprising: the vibration component roughly in the form of annular discs that the edge is arranged at peripheral part; Recessed the portion that on the oscillating component of this vibration component, forms to extend with the concentric ring-type of vibration component; On the inboard outer peripheral face of above-mentioned recessed portion, be rolled into the 1st sound coil member of ring-type; And the 2nd sound coil member that on the outer peripheral face of the outside of above-mentioned recessed portion, is rolled into ring-type.

Description of drawings

Fig. 1 is the profile of the structure of the existing loud speaker of expression.

Fig. 2 is the profile of the 1st embodiment of expression embodiment of the present invention.

Fig. 3 is the stereogram of shape of the oscillating plate of this embodiment of expression.

Fig. 4 is the stereogram of expression with the state of sound coil to this oscillating plate.

Fig. 5 is illustrated among the 1st embodiment, the key diagram of the magnetic flux flow of the magnetic circuit when the 1st framework and the 2nd framework are shaped with nonmagnetic substance.

Fig. 6 is illustrated among the 1st embodiment, the key diagram of the magnetic flux flow of the magnetic circuit when the 1st framework and the 2nd framework are shaped with magnetic material.

Fig. 7 is the profile of the 2nd embodiment of expression embodiment of the present invention.

Fig. 8 is the profile of the 3rd embodiment of expression embodiment of the present invention.

Fig. 9 is illustrated among the 3rd embodiment, the key diagram of the magnetic flux flow of the magnetic circuit when the 1st framework and the 2nd framework are shaped with nonmagnetic substance.

Figure 10 is illustrated among the 3rd embodiment, the key diagram of the magnetic flux flow of the magnetic circuit when the 1st framework and the 2nd framework are shaped with magnetic material.

Figure 11 is the profile of the 4th embodiment of expression embodiment of the present invention.

Figure 12 is the key diagram that is illustrated in the magnetic flux flow of magnetic circuit among the 4th embodiment.

Figure 13 is the profile of the 5th embodiment of expression embodiment of the present invention.

Figure 14 is the key diagram that is illustrated in the magnetic flux flow of magnetic circuit among the 5th embodiment.

Symbol description

10,20,30,40,50: loud speaker; 11: the 1 frameworks (the 1st framing component); 11a: hole; 12: oscillating plate (vibration component); 12A: oscillating plate main part (oscillating component); 12B: magnet resettlement section (recessed portion); 13: edge (edge member) 14: the 2 frameworks (the 2nd framing component); 15: dull and stereotyped (planar plate members); 16A, 16B, 36,56: magnet (magnet member); 17A: the 1st sound coil (the 1st sound coil member); 17B: the 2nd sound coil (the 2nd sound coil member); 21: magnetic; 41: flux of magnetic induction dish (the 1st flux of magnetic induction member); 42: flux of magnetic induction framework (the 2nd flux of magnetic induction member); 43: flux of magnetic induction flange (the 3rd flux of magnetic induction member); G1, g2: magnetic gap.

Embodiment

In the present invention, use the vibrational system assembly by loud speaker, magnetic circuit, the loud speaker that the 1st framework and the 2nd framework constitute is as its preferred forms, wherein, loud speaker is as follows with the vibrational system assembly: on the oscillating plate main part of the oscillating plate roughly in the form of annular discs that has formed the edge on the peripheral part, form the magnet resettlement section of the recessed strip that forms to extend with the concentric ring-type of this oscillating plate main part, the 1st sound coil is rolled into ring-type on the inboard outer peripheral face of this magnet resettlement section, and the 2nd sound coil is rolled into ring-type on the outer peripheral face of the outside of magnet resettlement section; Magnetic circuit is as follows: the magnet that is shaped as ring-type with the dull and stereotyped contacted state that is shaped as ring-type under be fixed to concentric shape, and be inserted in the magnet resettlement section of oscillating plate with being concentric shape; The 1st framework supports the peripheral part of oscillating plate via edge free vibration ground; The 2nd framework will constitute the assigned position in the flat board of magnetic circuit and the magnet resettlement section that magnet is supported in oscillating plate, and the wall portion across the magnet resettlement section makes dull and stereotyped inner peripheral surface and the 1st sound coil opposed, makes the outer peripheral face and the 2nd sound coil of flat board opposed.

In the loud speaker of present embodiment, by being supported in by the magnetic circuit that dull and stereotyped and magnet constitute on oscillating plate in the formed magnet resettlement section, and the 1st sound coil and the 2nd sound coil are installed on the outer peripheral face in the inboard of magnet resettlement section and the outside, need not as existing, when the magnetic circuit of assembling thin speaker, sound coil is inserted in the narrow magnetic gap, thus, it is easier than existing that the shaping of oscillating plate becomes, and can easily carry out the assembling of magnetic circuit.

[embodiment 1]

Fig. 2 is the sectional side view of the 1st embodiment in the execution mode of expression loud speaker of the present invention.

In this Fig. 2, the 1st framework 11 of loud speaker 10 is to form countless hole 11a on the bottom surface sections of the 11A of chassis body portion of shallow sphere in the bottom, and the periphery of 11B of outward flange portion and the 11A of this chassis body portion is shaped as one.

And, peristome side at the 1st framework 11, oscillating plate 12 is configured to the almost parallel with the 11A of chassis body portion, is installed on the 11B of outward flange portion by the edge 13 that will be configured as one with the periphery of this oscillating plate 12, and its state with 11 free vibrations of relative the 1st framework is supported.

Fig. 3 is the stereogram of the shape at expression this oscillating plate 12 and edge 13, and oscillating plate 12 is by roughly being oscillating plate main part 12A cylindraceous and integrally formed continuously with the outer peripheral face of this oscillating plate main part 12A and magnet resettlement section 12B that form recessed portion of ring-type constitutes.

The central portion of the front end face of the oscillating plate main part 12A of this oscillating plate 12 (at Fig. 2, being the face of upside) has the forwards side-prominent shape that bloats slightly.

Have again,, will narrate in the back about the width and the degree of depth (that is, the height of oscillating plate main part 12A) of the magnet resettlement section 12B of oscillating plate 12.

The circular edge main part 13A at edge 13 has forwards side (at Fig. 2, be upper side) crooked shape, be configured as one by peripheral part with the 13B of outward flange portion and this edge main part 13A, and the 13B of outward flange portion is fixed on the 11B of outward flange portion of the 1st framework 11, relative the 1st framework 11 free vibrations ground supports oscillating plate 12.

Front side (being upper side in Fig. 2) at oscillating plate 12, dispose discoid the 2nd framework 14, the 14B of outward flange portion that forms as one with the peripheral part of the 14A of chassis body portion of the 2nd framework 14 is fixed on the 11B of outward flange portion of the 1st framework 11 with the state across the 13B of outward flange portion at edge 13.

On the 14A of chassis body portion of the 2nd framework 14, be formed with countless hole 14a.

And, be shaped as the flat board 15 of ring-type and be formed separately for ring-type and two blocks of magnet being configured in dull and stereotyped 15 both sides (in this example, being neodium magnet) 16A, 16B be fixed in the outer peripheral edges portion of rear side (being the face of downside in Fig. 2) of the 2nd framework 14, and be supported on the assigned position of the magnet resettlement section 12B that is positioned at oscillating plate 12.

This

magnet

16A and 16B contact with dull and stereotyped 15 with separately homopolarity side (in illustrated embodiment, being N utmost point side) and are interfixed across the state of this flat board 14.

The external diameter of this

magnet

16A and 16B and internal diameter equate mutually, in addition, slightly little and internal diameter is bigger slightly than dull and stereotyped 15 internal diameter than dull and stereotyped 15 external diameter to be shaped as separately external diameter, dull and stereotyped 15 interior perimembranous is outstanding slightly to the inside from the interior perimembranous of

magnet

16A and 16B, and peripheral part is outstanding slightly laterally from the peripheral part of

magnet

16A and 16B.

The width radially of the magnet resettlement section 12B of oscillating plate 12 is set to: its internal diameter than the length of dull and stereotyped 15 the little regulation of internal diameter and external diameter than the length of dull and stereotyped 15 the big regulation of external diameter, between the internal perisporium face in the inner peripheral surface of the flat board 15 in the 12B of magnet resettlement section and the inboard in outer peripheral face and the magnet resettlement section 12B and the outside, be formed with gap (magnetic gap g1 described later, g2) respectively.

In addition, the degree of depth of this magnet resettlement section 12B be set to than dull and stereotyped 15 with the width addition of the centerline direction of

magnet

16A, 16B after the length of the big regulation of length.

On the outer peripheral face of the inboard of the magnet resettlement section of this oscillating plate 12 12B, as shown in Figure 4, under the inactive state of oscillating plate 12 with on dull and stereotyped 15 the opposed position of inner peripheral surface the 1st sound coil 17A that is rolled into ring-type is being installed, and dull and stereotyped 15 inner peripheral surface between be formed with magnetic gap g1, on the outer peripheral face in the magnet resettlement section 12B outside, under the inactive state of oscillating plate 12 with on dull and stereotyped 15 the opposed position of outer peripheral face the 2nd sound coil 17B that is rolled into ring-type is being installed, and dull and stereotyped 15 outer peripheral face between be formed with magnetic gap g2.

In this loud speaker 10, as mentioned above, magnetic circuit is made of flat board 15 and

magnet

16A, 16B, by flowing through identical electric current respectively with the 2nd sound coil 17B at the 1st sound coil 17A that is positioned at the magnetic field that forms by

magnet

16A, 16B, with respect to the flat board 15 and magnet 16A, the 16B that are supported in by the 2nd framework 14 on the assigned position, magnet resettlement section 12B in the direction parallel with center line (in Fig. 2, be above-below direction) go up and vibrate, thus, the sound takes place in oscillating plate main part 12A vibration.

Then, this oscillating plate main part 12A from the 2nd framework 14 on formed hole 14a and the 1st framework 11 formed hole 11a be output.

The material that forms the 1st framework 11 of above-mentioned loud speaker 10 and the 2nd framework 14 is that any in nonmagnetic material and the magnetic all can.

Fig. 5 shows the magnetic flux flow from

magnet

16A, 16B when the 1st framework 11 and the shaping of the 2nd framework 14 usefulness nonmagnetic substances, and Fig. 6 shows the magnetic flux flow from

magnet

16A, 16B when the 1st framework 11 and the shaping of the 2nd framework 14 usefulness magnetic materials.

This Fig. 5 and Fig. 6 are compared as can be known, in Fig. 6 since the 1st framework 11 and the 2nd framework 14 usefulness magnetic materials be shaped, the magnetic flux that comes from

magnet

16A, 16B is used as the

1st framework

11 and 14 inductions of the 2nd framework of magnetic, and turn back to respectively among magnet 16A, the 16B, so with the 1st framework 11 and the 2nd framework 14 is that the situation of Fig. 5 of being shaped with nonmagnetic substance is compared, and can carry out the utilization of magnetic flux effectively.

According to above-mentioned loud speaker 10, because flat board 15 and

magnet

16A, 16B are positioned at the magnet resettlement section 12B of oscillating plate 12, the 1st sound coil 17A and the 2nd sound coil 17B are installed on the outer peripheral face in the inboard of magnet resettlement section 12B and the outside, so need not as existing, when the magnetic circuit of assembling thin speaker, sound coil is inserted in the narrow magnetic gap, thus, the shaping of oscillating plate 12 is easier than existing, and can easily carry out the assembling of magnetic circuit.

[embodiment 2]

Fig. 7 is the sectional side view of the 2nd embodiment in the execution mode of expression loud speaker of the present invention.

In this Fig. 7, in loud speaker 20, except that the structure of the loud speaker 10 of above-mentioned the 1st embodiment, a side opposite with dull and stereotyped 15 of a magnet among two

magnet

16A, 16B of the both sides that are fixed on flat board 15 is (in illustrated embodiment, the rear side at magnet 16B), the magnetic 21 of ring-type is installed.

About the structure of other parts, the same with the structure of the loud speaker 10 of Fig. 2, be marked with the symbol identical for identical structure division with Fig. 2.

In this loud speaker 20, by magnetic 21 is installed on the magnet 16B, focused on this magnetic 21, can be carried out the utilization of magnetic flux effectively from the magnetic flux of magnet 16B.

[embodiment 3]

Fig. 8 is the sectional side view of the 3rd embodiment in the execution mode of expression loud speaker of the present invention.

In the loud speaker 10 of above-mentioned the 1st embodiment, two

magnet

16A, 16B are installed in the both sides of flat board 15, and in this Fig. 8, in the loud speaker 30, a magnet 36 is installed in a side (in illustrated embodiment, in the front side of loud speaker 30) of flat board 15.

The structure of the structure of other parts and the loud speaker of Fig. 2 10 is much the same, is marked with the symbol identical with Fig. 2 for identical structure division.

Compare with the loud speaker 10 of above-mentioned the 1st embodiment, because magnet of this loud speaker 30 usefulness formation magnetic circuit, so the thickness of attenuate loud speaker correspondingly.

Have again, in this loud speaker 30, also the situation with the loud speaker 10 of Fig. 2 is the same, the material that forms the 1st framework 11 and the 2nd framework 14 is that any in nonmagnetic material and the magnetic all can, but, with showing the 1st framework 11 and the 2nd framework 14 is when being shaped with nonmagnetic substance to be that Figure 10 from the magnetic flux flow of magnet 36 when being shaped with magnetic material compares as can be known from Fig. 9 of the magnetic flux flow of magnet 36 with showing the 1st framework 11 and the 2nd framework 14, under the situation of Figure 10, the magnetic flux that comes from magnet 36 is used as the

1st framework

11 and 14 inductions of the 2nd framework of magnetic, can more effectively carry out its utilization.

[embodiment 4]

Figure 11 is the sectional side view of the 4th embodiment in the execution mode of expression loud speaker of the present invention.

In this Figure 11, in loud speaker 40, the 1st framework 11 and the 2nd framework 14 usefulness magnetic materials are shaped.

And, in the loud speaker 40, except that the structure of the loud speaker 10 of Fig. 2, to be configured as its external diameter discoid flux of magnetic induction dish 41 slightly littler with magnetic material than the internal diameter of the 1st sound coil 17A, approach the state of interior all sides of the 1st sound coil 17A with its peripheral part, be configured on the inner side of the 1st sound coil 17A of the inboard that is installed in magnet resettlement section 12B.

On this flux of magnetic induction dish 41, be formed with countless hole 41a.

And, between the 11A of chassis body portion of the middle body of flux of magnetic induction dish 41 and the 1st framework 11, be equipped with magnetic material and be configured as bar-shaped or tabular flux of magnetic induction framework 42, this flux of magnetic induction framework 42 connects the 11A of chassis body portion of flux of magnetic induction dishes 41 and the 1st framework 11, and support flux of magnetic induction dish 41 makes it relative the 1st sound coil 17A and is positioned on the position of regulation.

In addition, on the outer fix of the 2nd sound coil 17B in the outside that is installed on magnet resettlement section 12B, the flux of magnetic induction flange 43 that is configured as ring-type with magnetic material is by being connected with the interior circumferential portion of the 11B of outward flange portion of the 1st framework 11, and the state that approaches the outer circumferential side of the 2nd sound coil 17B with perimembranous in it is positioned.

In this loud speaker 40, from the magnetic flux of

magnet

16A and 16B as among Figure 12 with shown in the magnetic line of force a like that, by flux of magnetic induction dish 41 and flux of magnetic induction framework 42, flux of magnetic induction flange the 43, the

1st framework

11 and 14 inductions of the 2nd framework, and turn back to

magnet

16A, 16B, thus, compare with the loud speaker of the various embodiments described above, can more effectively carry out the utilization of magnetic flux.

[embodiment 5]

Figure 13 is the sectional side view of the 5th embodiment in the execution mode of expression loud speaker of the present invention.

In the loud speaker 40 of above-mentioned the 4th embodiment, two

magnet

16A, 16B are installed in the both sides of flat board 15, and in this Figure 13, in loud speaker 50, a magnet 56 is installed in a side (in illustrated embodiment, in the front side of loud speaker 50) of flat board 15.

The structure of the structure of other parts and the loud speaker of Figure 11 40 is much the same, is marked with the symbol identical with Figure 11 for identical structure division.

Compare with the loud speaker 40 of above-mentioned the 4th embodiment, because magnet of this loud speaker 50 usefulness formation magnetic circuit, so the thickness of attenuate loud speaker correspondingly.

Have again, in this loud speaker 50, also the situation with the loud speaker 40 of Figure 11 is the same, from the magnetic flux of magnet 56 as among Figure 14 with shown in the magnetic line of force b like that, by flux of magnetic induction dish 41 and flux of magnetic induction framework 42, flux of magnetic induction flange the 43, the

1st framework

11 and 14 inductions of the 2nd framework, and turn back in the magnet 56, thus, can more effectively carry out the utilization of magnetic flux.

Claims

1. a loud speaker is characterized in that, comprising:

Vibration component roughly in the form of annular discs;

Recessed the portion that on the oscillating component of this vibration component, forms to extend with the concentric ring-type of vibration component;

Support the 1st framing component of the peripheral part of above-mentioned vibration component via edge member free vibration ground;

Planar plate members, be configured as its internal diameter than the big required length of the diameter of the inboard inner peripheral surface of above-mentioned recessed portion and its external diameter than the ring-type of the little required length of the diameter of the outside inner peripheral surface of recessed portion, be inserted in recessed the portion with vibration component with being concentric shape;

The magnet member, big and its external diameter is inserted in recessed the portion with vibration component with being concentric shape, and is fixed on the planar plate members than the external diameter circlet shape of planar plate members than the internal diameter of this planar plate members to be configured as its internal diameter;

The 2nd framing component of the assigned position in recessed portion with above-mentioned planar plate members and magnet member supports;

The 1st sound coil member is rolled into ring-type on the inboard outer peripheral face of above-mentioned recessed portion, with the inner peripheral surface that is supported on recessed the planar plate members in the portion across the wall portion of recessed portion and opposed; And

The 2nd sound coil member is rolled into ring-type on the outer peripheral face of the outside of above-mentioned recessed portion, with the outer peripheral face that is supported on recessed the planar plate members in the portion across the wall portion of recessed portion and opposed.

2. loud speaker as claimed in claim 1, two magnet members are fixed on the both sides of above-mentioned planar plate members respectively with the magnetic pole and the contacted state of planar plate members of same side.

3. loud speaker as claimed in claim 1, the magnet member is fixed on the one-sided of above-mentioned planar plate members with a magnetic pole and the contacted state of planar plate members.

4. loud speaker as claimed in claim 1 is equipped with magnetic on above-mentioned magnet member and a face contacted opposite side of planar plate members.

5. loud speaker as claimed in claim 1, above-mentioned magnet member is a neodium magnet.

6. loud speaker as claimed in claim 1, above-mentioned the 1st framing component is shaped with magnetic material.

7. loud speaker as claimed in claim 1 is formed with the hole that connects in the 1st framing component table in above-mentioned the 1st framing component.

8. loud speaker as claimed in claim 1, above-mentioned the 2nd framing component is configured in a side opposite with the 1st framing component across vibration component, and be shaped with magnetic material.

9. loud speaker as claimed in claim 1 is being formed with the hole that connects in the 2nd framing component table on above-mentioned the 2nd framing component.

10. loud speaker as claimed in claim 1 in the inboard of above-mentioned the 1st sound coil member, disposes the 1st flux of magnetic induction member that forms with magnetic.

11. loud speaker as claimed in claim 10, above-mentioned the 1st framing component is shaped with magnetic material, utilizes the 2nd flux of magnetic induction member that is arranged between the 1st framing component and the 1st flux of magnetic induction member, connects the 1st framing component and the 1st flux of magnetic induction member.

12. loud speaker as claimed in claim 1, the 3rd flux of magnetic induction member are configured between above-mentioned the 2nd sound coil member and the 1st framing component.

13. loud speaker as claimed in claim 12, above-mentioned the 3rd flux of magnetic induction member is connected with the 1st framing component.

14. a loud speaker magnetic circuit, two ring-type neodium magnets be respectively with the magnetic pole and the contacted state of planar plate members of same side, is fixed on the both sides of annular plate member with planar plate members with being concentric shape.

15. loud speaker magnetic circuit as claimed in claim 14, its external diameter is littler than the external diameter of planar plate members than the internal diameter of planar plate members is big for the internal diameter of above-mentioned neodium magnet.

16. a loud speaker vibrational system assembly comprises:

The vibration component roughly in the form of annular discs that the edge is arranged at peripheral part;

Being concentric annular with vibration component on the oscillating component of this vibration component extends and recessed portion of formation;

On the inboard outer peripheral face of above-mentioned recessed portion, be rolled into the 1st sound coil member of ring-type; And

On the outer peripheral face of the outside of above-mentioned recessed portion, be rolled into the 2nd sound coil member of ring-type.

17. loud speaker as claimed in claim 16 vibrational system assembly, above-mentioned recessed portion and vibration component are configured as one.

18. loud speaker as claimed in claim 16 vibrational system assembly, above-mentioned edge and vibration component are configured as one.

19. loud speaker as claimed in claim 16 vibrational system assembly, the internal perisporium of above-mentioned recessed portion and periphery wall extend with respect to the direction of vibration almost parallel ground of vibration component.