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JP4545222

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DESCRIPTION JP4545222
Abstract: An electromagnetic transducer having excellent performance is obtained by causing a
diaphragm to vibrate in a piston with a dual support structure with a small number of parts. An
electromagnetic converter includes a permanent magnet, a lower frame for fixing one magnetic
pole surface of the permanent magnet, an upper frame having an opening formed on the other
magnetic pole side, and the other magnetic pole surface. And a diaphragm 15 in which a voice
coil pattern 15g is disposed on the side surfaces 15b and 15c in the longitudinal direction and
the top surface 15a. The periphery of the top surface 15 a of the diaphragm 15 is joined to the
periphery of the opening 11 a of the upper frame 11 via the upper gasket 16. Further, the flange
portion 15 f at the periphery of the four side surfaces of the diaphragm 15 is joined to the inner
peripheral surface of the upper frame 11, that is, the inside of the magnetic circuit via the lower
gasket 18. [Selected figure] Figure 1
Electromagnetic converter
[0001]
The present invention relates to an electromagnetic transducer that performs sound
reproduction from an audio signal by combining a permanent magnet and a diaphragm.
[0002]
As a conventional speaker of the structure which integrated the diaphragm and the voice coil
pattern, there exist a speaker of the planar sound conversion apparatus of patent document 1, for
example, and patent document 2. FIG.
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1
In the flat acoustic transducer of Patent Document 1, a spiral voice coil pattern is formed on a
sheet made of polyimide of a thermosetting resin or polyethylene terephthalate (PET) of a
thermoplastic resin or a liquid crystal polymer, and both ends are bent. The diaphragm has a Ushaped cross section. The top surface of the diaphragm and the frame are joined by elastic edges
so that the voice coil patterns on both ends of the diaphragm are held so as to come to the
magnetic flux generating portion of the magnetic circuit. For this reason, even if the amplitude of
the diaphragm increases, the vertical displacement width of the voice coil pattern can be
contained in the magnetic flux generation portion.
[0003]
However, this diaphragm has a problem that rigidity is low because both ends in the longitudinal
direction are not bent only by bending both ends in the longitudinal direction, and noise is likely
to be generated due to unnecessary resonance accompanying vibration. The Furthermore, since a
support system such as an edge for fixing the diaphragm to the frame can be joined only to the
top surface of the diaphragm, there is also a problem that piston vibration is disturbed at large
amplitude and magnetic gap defects easily occur due to rolling.
[0004]
On the other hand, in the speaker of Patent Document 2, a voice coil pattern is formed in
advance on a thermosetting resin sheet such as a prepreg of a polyimide sheet or a laminated
sheet made of a glass resin and an epoxy resin, and heat-molded to form a cross section U It has
a letter-shaped dome shaped diaphragm. The entire periphery of the diaphragm and the frame
are joined by edges, and a support plate is fixed to the inside of the diaphragm, and the support
plate is joined to the damper on the frame side. Therefore, by making the diaphragm into a dome
shape, the rigidity can be improved, and the support structure of the diaphragm can be partially
but doubled.
[0005]
JP, 2008-113368, A JP, 2000-02094, A
[0006]
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2
Since the conventional electromagnetic converter is configured as described above, in the case of
the configuration of Patent Document 1, as described above, the generation of abnormal noise
due to low rigidity of the diaphragm and the generation of magnetic gap failure due to
disturbance of piston vibration There was a problem called.
On the other hand, in the case of the configuration of Patent Document 2, although the problem
of insufficient rigidity of the diaphragm can be solved, the problem that the vibration of the
piston is disturbed can be solved because the damper can be provided only partially. It was not.
[0007]
Furthermore, in the case of the configuration of Patent Document 2, the magnetic circuit has to
be divided in order to fix the damper to the frame, and there is a problem that the number of
parts increases. Further, when the magnetic circuit is divided and disposed, it causes unevenness
in the magnetic flux density and causes the magnetic flux density to decrease.
[0008]
Moreover, in order to obtain the diaphragm of the three-dimensional structure of the shape of
patent document 2 using a thermosetting resin sheet, after hardening the thermosetting resin
sheet in which the voice coil pattern was formed in three-dimensional structure, it hardens by
heat processing. In order to obtain a diaphragm having a three-dimensional structure using a
thermoplastic resin sheet, it is necessary to stretch a thermoplastic resin sheet on which a voice
coil pattern is formed by drawing using a heat press to obtain a three-dimensional shape. At this
time, since the elongation of the thermoplastic resin sheet and the elongation of the voice coil
pattern formed on the sheet are different, there is a problem that the coil and the sheet are
broken when drawn and formed. Furthermore, the thermosetting resin has a problem that the
cost is higher than that of the thermoplastic resin.
[0009]
The present invention has been made to solve the problems as described above, and it is an
object of the present invention to obtain an electromagnetic transducer with excellent
performance by causing a diaphragm to vibrate in a piston with a dual support structure with a
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small number of parts. I assume.
[0010]
An electromagnetic converter according to the present invention comprises a permanent magnet,
a magnetic circuit comprising a frame in which one magnetic pole surface of the permanent
magnet is fixed and the other magnetic pole side is open, and a plate fixed to the other magnetic
pole surface; A diaphragm having a top surface at a covering position and four side surfaces
formed from the top surface toward the permanent magnet and located between the plate and
the frame opening, and having a voice coil pattern formed on one side or both sides; The
diaphragm is joined to the top surface peripheral edge of the plate and the rim of the frame
opening, and is joined to the first support portion that holds the diaphragm displaceably, the side
edge side peripheral edge of the diaphragm and the frame inner circumferential surface And the
diaphragm has four side surfaces formed by heat-pressing both ends in the longitudinal direction
and both ends in the lateral direction of the thermoplastic resin sheet, Voice coil pattern in both
longitudinal direction Those which are arranged on the surface and the top surface.
[0011]
According to the present invention, since the top surface peripheral edge of the diaphragm is
joined to the frame opening peripheral edge and the side end side peripheral edge is joined to the
inner peripheral surface of the frame, the diaphragm is constructed with a dual support structure
with a small component configuration. The piston can be oscillated, and an electromagnetic
transducer with excellent performance can be obtained.
[0012]
It is a disassembled perspective view which shows the structure of the electromagnetic converter
which concerns on Embodiment 1 of this invention.
FIG. 1 is a cross-sectional view of an electromagnetic converter according to a first embodiment.
FIG. 7 is a cross-sectional view for illustrating the method of assembling the electromagnetic
converter according to the first embodiment.
FIG. 6 is a perspective view showing the configuration of a reinforcing structure provided on the
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diaphragm of the electromagnetic converter according to the first embodiment.
[0013]
Embodiment 1 FIG. 1 is an exploded perspective view showing a configuration of an
electromagnetic converter 10 according to Embodiment 1 of the present invention, and a crosssectional view thereof is shown in FIG. The electromagnetic converter 10 shown in the figure has
a magnetic circuit comprising an upper frame 11, a lower frame 12, a permanent magnet 13 and
a plate 14, a diaphragm 15, and an upper gasket for holding the diaphragm 15 on the magnetic
circuit upper side. It comprises a first support consisting of 16 and an edge 17 and a second
support consisting of a lower gasket 18 and a damper 19 for holding the diaphragm 15 inside
the magnetic circuit. In the first embodiment, the upper and lower portions are distinguished for
the purpose of explanation, but in actuality, any surface may be upper.
[0014]
The lower frame 12 fixes one magnetic pole surface of the permanent magnet 13 and the upper
frame 11 covers the lower frame 12 together with the permanent magnet 13 and is opened at
substantially the same height position as the other magnetic pole surface of the permanent
magnet 13 11a. A plate 14 is adhered on the other magnetic pole surface of the permanent
magnet 13. Thus, the plate 14 and the opening 11a are at substantially the same height position,
and the magnetic flux density between the plate 14 and the opening 11a is high.
[0015]
For the diaphragm 15, a thermoplastic resin sheet such as PEI (polyether imide), PEN
(polyethylene naphthalate), PET, PEEK (polyether ether ketone) is used. Conductor foil is edged
to form voice coil pattern 15g on one side or both sides of the thermoplastic resin sheet before
three-dimensional molding, at positions corresponding to the top surface 15a and the side
surfaces 15b and 15c in the longitudinal direction. Make it three dimensional. The rigidity of the
diaphragm 15 can be improved by forming the four sides of the diaphragm 15 into four side
surfaces 15b to 15e depending from the top surface 15a by heat press molding. In the illustrated
example, the side surfaces 15b and 15c in the longitudinal direction are formed to hang
vertically from the top surface 15a, and the side surfaces 15d and 15e in the short direction are
formed to hang obliquely from the top surface 15a. The side surfaces 15b and 15c in the
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longitudinal direction on which the voice coil pattern 15g is formed can be molded without
stretching the thermoplastic resin sheet at the time of heat press molding, so there is no fear of
breakage due to the difference in elongation rate. Further, a flange portion 15f is formed on the
tip side of the side surfaces 15b to 15e. The flange portion 15 f serves as a fixing margin when
the diaphragm 15 is bonded to the damper 19.
[0016]
The peripheral edge of the opening 17 a of the edge 17 is joined to the peripheral edge of the
top surface 15 a of the diaphragm 15, and the outer peripheral edge of the edge 17 is joined to
the peripheral edge of the opening 16 a of the upper gasket 16. Upper gasket 16 is secured to
the upper surface of upper frame 11. The upper gasket 16 and the edge 17 serve as a first
support portion to support the diaphragm 15 so as to be vertically displaceable. The outer
peripheral edge of the edge 17 may be directly joined to the upper frame 11 without using the
upper gasket 16. In that case, it is necessary to secure a predetermined distance between the top
surface 15a and the plate 14 so as not to collide with the plate 14 when the diaphragm 15 is
vertically displaced, for example, a part of the upper surface of the upper frame 11 May be
protruded upward for height alignment, or the outer peripheral edge of the edge 17 may be
extended to the upper surface of the upper frame 11.
[0017]
The periphery of the opening 19 a of the damper 19 is joined to the flange portion 15 f of the
peripheral edge of the side surface of the diaphragm 15, and the outer periphery of the damper
19 is joined to the periphery of the opening 18 a of the lower gasket 18. The lower gasket 18 is
fixed to the upper back surface of the upper frame 11, that is, the inside of the magnetic circuit.
The lower gasket 18 and the damper 19 serve as a second support portion to support the
diaphragm 15 so as to be vertically displaceable. The outer peripheral edge of the damper 19
may be directly joined to the inside of the upper frame 11 without using the lower gasket 18.
[0018]
Next, the operation principle of the electromagnetic converter 10 will be described. When
current (audio signal) is supplied from the outside to the voice coil pattern 15g, the current
flowing through the voice coil pattern 15g and the magnetic flux generated between the opening
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11a of the upper frame 11 and the plate 14 are electromagnetically coupled Driving force is
generated according to Fleming's law. The vibrating plate 15 vibrates in the vertical direction by
the generated driving force, and a sound wave is generated. The whole circumference of the top
surface 15a of the diaphragm 15 and the whole circumference of the flange portion 15f are
supported so as to be vertically displaced by the first and second support portions, respectively.
Absent. Therefore, no magnetic gap failure occurs due to rolling. In addition, the diaphragm 15
does not collide with the permanent magnet 13 and the plate 14, and no collision noise is
generated.
[0019]
Next, a method of assembling the electromagnetic converter 10 will be described. FIG. 3 is a
cross-sectional view for explaining the method of assembling the electromagnetic converter 10
according to the first embodiment. As shown in FIG. 3A, the diaphragm 15, the lower gasket 18,
and the damper 19 are first joined to assemble the diaphragm ASSY. Subsequently, the adhesive
20 is applied to the upper back surface of the upper frame 11, and the outer periphery of the
lower gasket 18 is used as a guide to bond the diaphragm ASSY and the upper frame 11. The
diaphragm ASSY to which the upper frame 11 is adhered is attached to the jig 21 to fix its
position as shown in FIG. 3 (b). Subsequently, as shown in FIG. 3 (b), the upper gasket 16 and the
edge 17 are joined to assemble the edge ASSY. The adhesive 22 is applied around the opening of
the edge 17 and the adhesive 23 is applied to the upper surface of the upper frame 11 to bond
the edge ASSY and the diaphragm ASSY. Subsequently, as shown in FIG. 3C, the lower frame 12,
the permanent magnet 13 and the plate 14 are adhered to assemble the magnet ASSY, and the
upper frame 11 and the lower frame 12 are screwed or glued or the like. By joining, the
assembly of the electromagnetic converter 10 is completed.
[0020]
As described above, according to the first embodiment, the electromagnetic converter 10
includes the permanent magnet 13, the lower frame 12 for fixing one magnetic pole surface of
the permanent magnet 13, and the upper frame having the opening 11a on the other magnetic
pole side. 11 and a magnetic circuit comprising a plate 14 fixed to the other magnetic pole
surface, a top surface 15a at a position covering the plate 14, and the top surface 15a from the
top surface 15a in the direction of the permanent magnet 13 Diaphragm 15 having four side
surfaces 15b-15e located between openings 11a and having voice coil pattern 15g formed
thereon, upper gasket 16 adhered to the periphery of opening 11a of upper frame 11, and top
surface of diaphragm 15 An edge 17 joined to the rim of the upper gasket 16 and the rim of the
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opening 16a of the upper gasket 16 to displaceably hold the diaphragm 15, and the inner
peripheral surface of the upper frame 11 A lower gasket 18 which adheres, joined to the opening
18a peripheral edge of the flange portion 15f and the lower gasket 18 of the diaphragm 15, and
configured to include a damper 19 for holding the vibrating plate 15 to be freely displaceable.
For this reason, the diaphragm 15 can be supported by the dual support structure with a small
number of parts and the piston can be vibrated, and generation of abnormal noise can be
prevented. Further, it is not necessary to divide the magnetic circuit as in the prior art, and the
number of parts is not increased and the cost is not increased. Furthermore, since it is not
necessary to divide and arrange the magnetic circuit, neither unevenness in magnetic flux density
nor magnetic flux density is reduced.
[0021]
Further, according to the first embodiment, the diaphragm 15 has the four side surfaces 15b to
15e formed by heat-press forming both ends in the longitudinal direction and both ends in the
width direction of the thermoplastic resin sheet. The coil pattern 15g is disposed on the side
surfaces 15b and 15c and the top surface 15a in the longitudinal direction. Therefore, it is
possible to use a low cost thermoplastic resin instead of a high cost thermosetting resin, and as a
result, an inexpensive electromagnetic converter 10 can be obtained.
[0022]
A reinforcing structure 15 h may be formed on the top surface 15 a of the diaphragm 15 to
increase the rigidity of the diaphragm 15. FIG. 4 is a perspective view showing the configuration
of a reinforcing structure 15h provided on the diaphragm 15 according to the first embodiment.
The reinforcing structure 15 h may be realized by a rib structure or a concavo-convex structure,
and the formation direction of the rib or the concavo-convex may be the longitudinal direction or
the transverse direction of the diaphragm 15 as shown in FIG. 4. By providing the reinforcing
structure 15h on the top surface 15a, the rigidity of the diaphragm 15 can be further improved,
and the performance of the electromagnetic converter 10 can be improved.
[0023]
In the first embodiment, the method of forming the voice coil pattern 15g by edging before hotpressing the diaphragm 15 has been described, but the present invention is not limited to this.
The voice coil pattern 15g may be printed and formed, or a voice coil pattern 15g may be formed
by attaching a coil to the diaphragm 15 after three-dimensional formation.
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[0024]
DESCRIPTION OF SYMBOLS 10 electromagnetic converter, 11 upper frame (frame), 11a, 16a,
17a, 18a, 19a opening, 12 lower frame (frame), 13 permanent magnet, 14 plate, 15 diaphragm,
15a top surface, 15b, 15c, 15d, 15e side surface, 15f flange portion, 15g voice coil pattern, 15h
reinforcing structure, 16 upper gasket (first support portion), 17 edge (first support portion), 18
lower gasket (second support portion) , 19 Damper (second support portion), 20, 22, 23
Adhesive, 21 Jig.
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