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JPH10327486

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH10327486
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker in which a voice coil is directly attached to a diaphragm to achieve thinning by omitting
a bobbin, and more particularly to a speaker equipped with measures against leakage flux. is
there.
[0002]
2. Description of the Related Art In recent years, with the commercialization of thin monitors
such as PDPs (plasma display panels), there has been an increasing demand for thinner speakers.
The applicant omits the bobbin and attaches the outer periphery of the voice coil directly to the
diaphragm to reduce the thickness, and provides a plurality of repelling magnetic circuit
arrangement holes in a row on one diaphragm. A thin speaker having a repulsion magnetic
circuit disposed in each repulsion magnetic circuit arrangement hole, that is, a multipoint drive
type to secure a predetermined diaphragm area, has previously been filed for application (at the
time of this application, unopened) ).
[0003]
On the other hand, in the case where the speaker is disposed close to the electric device affected
by the magnetic flux, it is necessary to take measures for the leakage flux from the speaker. In
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the conventional speaker, the voice coil is attached to the bobbin, and the cone-shaped
diaphragm spreads forward from the front end of the bobbin, and the outer peripheral side of the
bobbin is vacant. It was easy to take measures against the leakage flux from the speaker easily.
[0004]
SUMMARY OF THE INVENTION In the above-described thin speaker, the repulsion magnetic
circuit is placed at the center and the diaphragm is in the same position as the center plate of the
repulsion magnetic circuit in the front-rear direction, for thinning. It is difficult to arrange the
magnetic shielding magnetic body just outside the voice coil. The magnet on the front side is
located forward of the diaphragm, and it is possible to arrange the magnetic shielding magnetic
body at the position of the magnet on the front side in the axial direction of the repulsive
magnetic circuit and in the radial direction of the repulsive magnetic circuit In that case, the
magnetic shielding magnetic material becomes a horn, which affects the diffusion of the emitted
sound.
[0005]
An object of the present invention is to provide a speaker in which an appropriate measure
against leakage flux is taken while achieving thinning.
[0006]
The speaker (10) of the present invention has the following (a) to (d).
(A) A repulsion magnetic circuit is provided on the outer peripheral side of the diaphragm (32)
(b) which has a repulsion magnetic circuit arrangement hole and is supported by the diaphragm
support (18) at the peripheral edge through the edge (40) A voice coil (36) (c) attached to the
installation hole, and a plate (26) disposed on the inner peripheral side of the voice coil (36) with
a gap (38) between the voice coil (36) and the voice coil (36) Repulsion magnetic circuit (24) (d)
at least in the axial direction of the repulsion magnetic circuit (24) comprising a pair of magnets
(28, 30) fixed to both sides of the plate (26) with the same poles facing each other Magnetic
shielding magnetic body (48) disposed outside the diaphragm support (18) in an overlapping
range with the plate (26)
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[0007]
The magnetic shielding magnetic body (48) may not be disposed over the entire circumferential
direction of the diaphragm support (18), but may be disposed only in the direction in which the
leakage magnetic flux is to be avoided. When the magnetic flux extending radially outward from
the plate (26) reaches the magnetic shielding magnetic body (48), it bends and passes through
the inside of the magnetic shielding magnetic body (48) to form the magnetic shielding magnetic
body (48). It is suppressed from leaking out).
[0008]
According to another speaker (10) of the present invention, the rear end of the magnetic
shielding magnetic body (48) is further rearward than the rear end of the repulsive magnetic
circuit (24) in the axial direction of the repulsive magnetic circuit (24). Has reached.
[0009]
The magnetic flux that has entered the magnetic shielding magnetic body (48) passes through
the inside of the magnetic shielding magnetic body (48) to the axial direction of the repulsive
magnetic circuit (24) in the axial direction of the repulsive magnetic circuit (24) behind the rear
end of the repulsive magnetic circuit (24) And return to the back magnet (30) of the repulsive
magnetic circuit (24).
As a result, in particular, the magnetic flux relating to the rear side magnet (30) can be reliably
suppressed from coming out of the magnetic shielding magnetic body (48).
[0010]
According to another speaker (10) of the present invention, the diaphragm (32) is provided with
a plurality of repelling magnetic circuit disposition holes in a row. A voice coil (36) and a
repulsive magnetic circuit (24) are provided corresponding to each repelling magnetic circuit
arrangement hole. The magnetic shielding magnetic body (48) extends in the arranging direction
of the repelling magnetic circuit arrangement holes.
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[0011]
The speaker (10) is long in the arrangement direction of the plurality of repulsive magnetic
circuits (24) and is shortened in the direction perpendicular to the arrangement direction. As a
result, among the leakage flux from the speaker (10), the leakage flux in the short side direction
tends to increase, but the magnetic shielding magnetic body (48) is at least one of the two long
sides of the speaker (10) Are disposed along the long sides of the speaker, and stand against the
magnetic flux which leaks out beyond the magnetic shielding magnetic body (48) in the direction
of the short side of the speaker (10) to suppress the magnetic flux .
[0012]
According to another speaker (10) of the present invention, the diaphragm support (18) and the
magnetic shielding magnetic body (48) are an integral part (60) of the same material.
[0013]
The diaphragm support (18) and the magnetic shielding magnetic body (48) are integrated with
the same material (60) to form the diaphragm support (18) and the magnetic shielding magnetic
body (48). It is possible to omit the trouble of assembling the
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
FIG. 1 is a front view of the speaker 10, and FIG. 2 is a cross-sectional view of the speaker 10 as
viewed from the right side.
The cabinet 12 is a housing box for the components of the speaker 10. The dimensions of each
part of the external shape of the cabinet 12 are, for example, about 50 mm in width, about 230
mm in height, and 15 mm in depth (depth). It is slender. The slope portion 13 is provided on the
front surface of the cabinet 12 and has a track shape in a front view in the form of a track of the
stadium, and is sloped inward from the outside to the inside. The frame 14 has a bottom portion
16, a circumferential wall portion 18 projecting forward from the circumferential portion of the
bottom portion 16 and a front surface being an edge sticking margin portion 20, and three poles
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arranged at equal intervals on the left and right symmetrical lines of the frame 14 It has a section
22. The upper and lower ends of the frame 14 are provided with raised portions 21 that
protrude forward from the edge covering portion 20. The repulsive magnetic circuit 24 is
inserted in each pole portion 22 and has a front plate 28 and a rear plate 30 fixed to the front
and back of the center plate 26 with the same pole facing the center plate 26 made of soft
magnetic material such as iron. And. The diaphragm 32 made of paper has a circumferential
contour equal to the track shape of the slope portion 13 and comprises a total of three vibrating
portions 34. The central portion of each vibrating portion 34 is the center plate 26 of each
repulsive magnetic circuit 24. It is a circular hole larger by a predetermined dimension than the
outer diameter of. In each vibrating portion 34, the front (= front) side is aligned on the same
plane, and the back (= back) side is changed in position in the front-rear direction, and is thicker
at the central portion and thinner toward the radial direction. . The ribs 39 are provided at thin
portions between the adjacent vibrating portions 34. The edge 40 of the fabric has the same
contour as the track shape of the slope portion 13 and is fixed to the peripheral portion of the
diaphragm 32 and the edge affixing portion 20 on the inner and outer circumferences, and has a
curved shape convex on the surface side (FIG. 3) ), And functions as a damper. The pressing plate
42 extends along the left and right center lines of the diaphragm 32, and is fixed to the raised
portions 21 of the frame 14 by screws 44 at the upper and lower ends, and the tops of the pole
portions 22 by screws 46 in each repulsive magnetic circuit 24. It is fixed to A rectangular iron
plate 48 (in FIG. 2, the iron plate 48 is shown by a hatched area). ) Is fixed to the left and right
side wall inner surfaces of the cabinet 12 and extends over the range of both screws 44 in the
vertical direction, from the front end of the center plate 26 to the back and forth direction from
the front end of the repulsive magnetic circuit 24 to the inner surface of the back wall of the
cabinet 12 It is over.
[0015]
FIG. 3 is a schematic cross-sectional view in the width direction of the speaker 10, and FIG. 4 is a
magnetic flux diagram in FIG. The front magnet 28 and the back magnet 30 have N poles facing
each other. An iron plate 48 as a magnetic shielding magnetic body reaches the front end of the
center plate 26 at the front end (upper end in FIG. 3) in the axial direction of the repulsive
magnetic circuit 24. The magnetic flux emitted from the front side magnet 28 and the rear side
magnet 30 travels in the surface direction of the center plate 26 at the center plate 26 and exits
from the circumferential surface portion of the center plate 26 radially outward. When the
magnetic flux that has almost come out along the surface direction of the center plate 26 reaches
the iron plate 48, it is refracted so as to pass through the iron plate 48 and is prevented from
going out beyond the iron plate 48. The magnetic flux relating to the rear side magnet 30 passes
through the inside of the iron plate 48, reaches the rear end of the rear side magnet 30
sufficiently backward, and returns to the rear side magnet 30. The magnetic flux relating to the
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front side magnet 28 is a magnetic flux coming out from the center plate 26 along the almost
surface direction of the center plate 26, that is, the magnetic flux which may reach the farthest in
the radial direction of the repulsive magnetic circuit 24 reaches the iron plate By passing
through the front end of the iron plate 48, the direction is properly changed from the radially
outer side to the inner side. Thus, the magnetic flux directed to the iron plate 48 is restrained
from going beyond the iron plate 48 to the outside.
[0016]
FIG. 5 is a cross-sectional view of a structure in which the structure of FIG. 4 is partially changed.
The iron plate 48 and the frame 62 are integrated as a part of an iron integrally formed article
60 as a magnetic body. The frame 62 includes the bottom portion 16 of the frame 14 of FIG. 2,
the peripheral wall portion 18 and the edge sticking portion 20, and the pole 64 is separate from
the frame 62 and the bottom portion is fixed to the frame 62. The integration of the iron plate 48
and the frame 62 by the integrally formed iron product 60 eliminates the trouble of assembly.
[0017]
Brief description of the drawings
[0018]
1 is a cross-sectional view seen from the right side of the speaker.
[0019]
2 is a cross-sectional view seen from the right side of the speaker.
[0020]
3 is a schematic cross-sectional view in the width direction of the speaker.
[0021]
4 is a magnetic flux diagram in FIG.
[0022]
5 is a cross-sectional view of a structure in which the structure of FIG. 4 is partially changed.
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[0023]
Explanation of sign
[0024]
DESCRIPTION OF REFERENCE NUMERALS 10 speaker 18 peripheral wall portion (diaphragm
support) 24 repulsive magnetic circuit 26 center plate (plate) 28 front side magnet (magnet) 30
back side magnet (magnet) 32 diaphragm 36 voice coil 38 annular gap (gap) 40 edge 48 Iron
plate (magnetic material for magnetic shielding) 60 Iron integrally molded product (one-piece
product)
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