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JP2006020135

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DESCRIPTION JP2006020135
PROBLEM TO BE SOLVED: To provide a diaphragm drive unit capable of reducing the thickness
of a diaphragm drive unit. SOLUTION: A plurality of permanent magnets 22 having a rectangular
cross section in a direction perpendicular to the direction of magnetization are arranged on a
yoke plate 21 so that the directions of magnetic poles are alternated, and permanent magnets are
arranged at opposing positions of the yoke plate 21. The coupler member 24 is disposed at a
predetermined distance from the top surface of the coupler 22, and the coupler member 24 is
elastically supported by a plate spring 23 fixed around the yoke plate 21. The coils 27 wound in
a plane are respectively provided at the positions corresponding to 1 and connected in series,
and the coils 27 flow from the start of the first coil edge to the end of the last coil edge. At the
same time, current flows in the same direction through the sides of adjacent coils. If the
diaphragm 2 is attached to the coupler member, it becomes a thin speaker. [Selected figure]
Figure 2
Diaphragm drive unit and thin speaker using this unit
[0001]
The present invention relates to a diaphragm drive unit and a thin speaker using the unit, and in
particular, a thin diaphragm drive unit capable of causing the diaphragm to function as a
diaphragm of a speaker by being attached to the diaphragm, and the unit It relates to the thin
speaker used.
[0002]
A speaker is a device that converts voice and music signals converted into electrical signals into
acoustic vibrations and radiates sound waves into space, a voice coil to which electrical signals
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1
are input, and a permanent that generates a magnetic field around the voice coil. A magnetic
circuit comprising a magnet and a yoke, and a diaphragm that vibrates due to the movement of a
voice coil.
[0003]
A conventional speaker generally has a metal frame shaped like a truncated cone, and a magnetic
circuit consisting of a permanent magnet and a yoke is attached to the back side (upper bottom),
and a cone-shaped vibration is made on the front side (lower bottom) of the metal frame. The
large diameter side of the plate was supported by the edge, and a voice coil was wound around
the position of the magnetic circuit on a bobbin attached to the center of the diaphragm.
In addition to being housed and installed in a box for listening to music outdoors or at home, a
speaker of such a structure is installed in the vehicle interior of a vehicle, for example, a
passenger car, and output from a radio or car stereo device. Used to perform sound reproduction
of music and voice.
[0004]
However, when a speaker is installed in a passenger compartment of a passenger car, a speaker
having such a diaphragm is required to have a predetermined distance from the yoke to the edge.
The thickness was necessary.
For example, if the speaker is installed in the door or ceiling, the thickness of the door or ceiling
may increase, or if the thickness of the door or ceiling is left unchanged, the compartment of the
speaker installation portion There has been a problem that an inwardly protruding bulge occurs.
[0005]
In order to solve this problem, Patent Document 1 describes a thin loudspeaker in which the
thickness of the loudspeaker is reduced by changing the shape of the diaphragm from a cone to a
disc. However, even with this thin speaker, the diaphragm is attached to a metal frame and used,
which is insufficient for thinning the speaker.
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2
[0006]
Therefore, as a speaker to be installed in a passenger compartment of a passenger car, a thin
speaker using a diaphragm drive unit has been proposed which has a structure in which a coneshaped diaphragm is omitted and an interior material of the passenger compartment is used as a
diaphragm.
[0007]
FIG. 1 shows the structure of a conventional diaphragm drive unit 10, in which (a) shows the side
of the drive unit 10 attached to the interior plate 1 of a car, half of which is a longitudinal cross
section from the center FIG. 6 (b) shows the diaphragm drive unit 10 of FIG.
[0008]
As shown in FIG. 1A, the diaphragm drive unit 10 has a round, dish-shaped outer yoke 11 having
a recess in which a side wall portion and a bottom portion are continuously formed, and a bottom
portion of the outer yoke 11. It has a magnetic circuit portion comprising a disk-shaped
permanent magnet 12 mounted 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 .
[0009]
A gap is provided between the inner surface of the side wall portion of the outer yoke 11 of the
magnetic circuit portion and the outer peripheral surface of the inner yoke 13, 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 16 a protruding toward the magnetic circuit portion is provided on the outer
peripheral portion of the coupler member 16.
The number of leg portions 16a is three in this example as shown in FIG. 1B, and provided at
equal intervals on the outer peripheral portion of the coupler member 16.
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The leg portion 16 a is connected to the outer peripheral portion of the outer yoke 11 via a plate
spring 17.
[0010]
The leaf spring 17 includes an annular base portion 17b and an arm portion 16a concentrically
extended from the base portion 16b to the base portion 16b as shown in FIG. 1 (b). The distal
end of the arm 16 a is attached to the leg 16 a by a screw 18. In this example, the lengths of the
three arm portions 16a are all the same.
[0011]
When the 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 plate 1 via the coupler member 16. Since the interior plate 1 is formed
of a material such as urethane or foamed resin (for example, foamed polypropylene), the interior
plate 1 itself plays a role of a diaphragm, and the vibration of the interior plate 1 emits a sound
to the vehicle interior side Ru.
[0012]
As described above, by using the interior plate 1 as the diaphragm, it becomes possible to form a
good sound field in the vehicle compartment, and the thickness of the drive unit 10 can be
reduced by the absence of the diaphragm. Can be realized. The diaphragm drive unit 10 is not
limited to the interior plate 1 of an automobile, and can be configured as a panel-type speaker
device if attached directly to a lightweight diaphragm.
[0013]
Japanese Patent Application Laid-Open No. 9-130892 (FIG. 1)
[0014]
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4
However, in the conventional diaphragm drive unit 10 configured as described above, a magnetic
circuit including the outer yoke 11 and the inner yoke 13 sandwiching the permanent magnet 12
and a bobbin 14 for winding the voice coil 15 are included. The arrangement of the wires of the
voice coil 15 on the bobbin 14 is 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, which reduces the
dimension of the diaphragm drive unit 10 in the thickness direction. Was not enough.
[0015]
Therefore, in the present invention, the overall thickness can be reduced by changing the
arrangement of the yokes and permanent magnets constituting the magnetic circuit and the
arrangement of the wires constituting the voice coil to reduce the thickness and eliminating the
bobbin. It is an object of the present invention to provide a diaphragm drive unit which can be
further reduced.
[0016]
The diaphragm drive unit of the present invention which achieves the above object can take the
following first to sixteenth modes.
[0017]
The diaphragm drive unit according to the first aspect includes a yoke plate, a plurality of
permanent magnets arranged on the yoke plate such that adjacent permanent magnets are
opposite in polarity 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 is provided around
the yoke plate and a coupler member to which the diaphragm can be attached on the surface
opposite to the yoke plate, and elastically supports the coupler member An elastic body and a
coil provided in a position corresponding to each permanent magnet of the coupler member, and
having a side wound in a direction perpendicular to the magnetic field lines between the
permanent magnets, and having a coil wound in one plane 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.
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[0018]
The diaphragm drive unit according to the second aspect is the diaphragm drive unit according
to the first aspect, wherein the surface of the coupler member facing the permanent magnet, the
surface facing the portion around the permanent magnet bulges by the same height. The coil is
disposed at this bulging portion.
[0019]
The diaphragm drive unit of the third aspect is the diaphragm drive unit of 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 disposed at a portion around the through hole.
[0020]
The diaphragm drive unit according to the fourth aspect comprises 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. A magnetic circuit
having a bulging portion bulging to the same level as the permanent magnet and a top surface of
the permanent magnet are disposed at a predetermined distance away from the top surface of
the permanent magnet, The coupler member to which the diaphragm can be attached on the
opposite side to the surface, the elastic body provided around the yoke plate to elastically
support the coupler member, and the coupler member provided at positions corresponding to the
respective permanent magnets And coils wound in one plane so as to have sides in a direction
perpendicular to the magnetic field lines between the permanent magnets, each coil having an
inner winding start point being an outer winding end point of the other coil Connected to Are
connected in series so that when current flows from the start of the first coil edge to the end of
the last coil edge, currents of different directions flow in the adjacent coil sides. It is
characterized in that it is connected.
[0021]
The diaphragm drive unit according to the fifth aspect of the present invention comprises a
plurality of yoke plates and a plurality of yoke plates arranged on opposite surfaces of the two
yoke plates such that adjacent permanent magnets have opposite polarities. A permanent magnet
and an intermediate position of the two yoke plates are disposed at a predetermined distance
from the top surface of the permanent magnet, and a diaphragm is attached to the outside of one
of the two yoke plates via a mounting member And an elastic member provided around each of
the two yoke plates and elastically supporting the coupler member at an intermediate portion of
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6
the two yoke plates, and a permanent magnet on one side of the coupler member The coil is
provided at a position corresponding to each piece, and has coils wound in one plane so as to
have sides in a direction perpendicular to the magnetic lines of force between the permanent
magnets, and each coil has an inner ridge start point other than the other Of the coil The coils
are connected in series so as to be connected to the winding end point of the side, and when
current flows from the winding start point of the first coil to the winding end point of the last
coil, the adjacent coil sides It is characterized in that it is connected so that the current of the
same direction flows.
[0022]
The diaphragm drive unit of the sixth aspect is characterized in that, in the diaphragm drive unit
of the fifth aspect, the coil is provided also on the other surface of the coupler member.
[0023]
The diaphragm drive unit according to a seventh aspect is the diaphragm drive unit according to
any one of the first to the sixth aspects, wherein a base on which an elastic body elastically
supporting the coupler member is fixed to the yoke plate, and the base to the yoke plate The
coupler member is characterized in that the coupler member is elastically supported at the tip of
the arm portion.
[0024]
The diaphragm drive unit of the eighth aspect is characterized in that, in the diaphragm drive
unit of the seventh aspect, the number and shape of the arm portions are determined by the
shape and size of the diaphragm.
[0025]
The diaphragm drive unit according to a ninth aspect is the diaphragm drive unit according to
the seventh or eighth aspect, wherein the elastic coefficient of the arm portion is provided with
irregularities in the arm portion, a hole is made, a weight is attached to the arm portion It is
characterized by changing by at least one method of
[0026]
The 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
a mounting member and a screw.
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7
[0027]
The diaphragm drive unit according to an eleventh aspect is the diaphragm drive unit according
to the tenth aspect, wherein the link member is bridged between the adjacent attachment
members, and the link member and the elastic body are at predetermined positions. The elastic
coefficient of the arm portion is changed by coupling with a clamp member.
[0028]
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 a base on which an elastic body elastically
supporting the coupler member is fixed to the yoke plate, and the yoke from the base The arm
comprises an arm extending along the periphery of the plate, and the coupler member is coupled
to the arm at its tip and is also coupled and resiliently supported at a predetermined distance
from the tip. It is characterized by
[0029]
The 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, corner portions of the
wound coil are bent in an arc shape. .
[0030]
The diaphragm drive unit according to a fourteenth aspect is characterized in that, in the
diaphragm drive unit according to any of the first to thirteenth aspects, the permanent magnet
has a rectangular cross section in a direction perpendicular to the direction of the magnetization.
It is a thing.
[0031]
A diaphragm drive unit according to a fifteenth aspect is the diaphragm drive unit according to
any one of the first to fourteenth aspects, wherein the coupler member has a heat dissipation
structure for dissipating heat generated in the coil. is there.
[0032]
The diaphragm drive unit according to a sixteenth aspect is characterized in that, in the
diaphragm drive unit according to the fifteenth aspect, the heat dissipation structure is a heat
dissipation sheet laminated on the surface opposite to the installation surface of the coil of the
coupler member. It is said that.
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8
[0033]
The diaphragm drive unit of a seventeenth aspect is the diaphragm drive unit of the fifteenth
aspect, wherein the heat dissipation structure is a heat dissipation sheet laminated between the
coil installation surface of the coupler member and the coil. It is a feature.
[0034]
The diaphragm drive unit according to an eighteenth aspect is characterized in that, in the
diaphragm drive unit according to the fifteenth aspect, the heat dissipation structure is a heat
sink attached to the surface of the coupler member opposite to the installation surface of the coil.
Diaphragm drive unit.
[0035]
The diaphragm drive unit of a nineteenth form is the diaphragm drive unit of the seventeenth
form, further comprising a heat sink attached to the surface of the yoke plate opposite to the
attachment surface of the permanent magnet, The heat sink is connected by a heat conducting
member.
[0036]
The diaphragm drive unit according to a twentieth aspect is the diaphragm drive unit according
to any 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 movement of the diaphragm drive unit It
is characterized in that the weight ratio to the total weight of the drive part excluding parts is
between 0.3 and 3.0.
[0037]
Further, in the thin loudspeaker using the diaphragm drive unit according to the present
invention, in any of the first to twentieth diaphragm drive units, the diaphragm is attached to the
coupler member directly or through the vibration transmission member. It is characterized by
[0038]
Furthermore, in the thin speaker using the diaphragm drive unit of the present invention, in the
diaphragm drive unit of the first embodiment, the coupler member is replaced by the diaphragm
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9
and the diaphragm is directly driven by the diaphragm drive unit. It is a feature.
It is a thin speaker using the said diaphragm drive unit.
In this case, the coil may be embedded in the diaphragm.
[0039]
According to the diaphragm drive unit of the first aspect, the thickness of the diaphragm drive
unit can be reduced.
[0040]
According to the diaphragm drive unit of the second aspect, since the magnetic flux density can
be effectively used, the driving force can be increased.
[0041]
According to the diaphragm drive unit of the third aspect, the weight of the diaphragm can be
reduced, and the sound pressure is increased.
Further, the thickness can be further reduced as compared with the diaphragm drive unit of the
first embodiment.
[0042]
According to the diaphragm drive unit of the fourth aspect, the driving force can be increased by
the effective use of the magnetic flux density.
[0043]
According to the diaphragm drive units of the fifth and sixth aspects, the number of magnetic
circuits is increased, so that efficient use of magnetic flux can be achieved, and the driving force
can be increased.
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10
[0044]
According to the diaphragm drive unit of the seventh aspect, the coupler member can be
elastically supported stably.
[0045]
According to the diaphragm drive unit of the eighth and ninth modes, it is possible to control the
frequency characteristics and the lowest limit frequency of the diaphragm.
[0046]
According to the diaphragm drive unit of the tenth aspect, the coupler member and the arm
portion can be firmly coupled.
[0047]
According to the diaphragm drive unit of the eleventh and twelfth aspects, the frequency
characteristics and the lowest limit frequency of the diaphragm can be controlled.
[0048]
According to the diaphragm drive unit of the thirteenth and fourteenth aspects, the magnetic flux
can be efficiently utilized, and the driving force can be increased.
[0049]
According to the diaphragm drive unit of the fifteenth to nineteenth aspects, Joule heat
generated in the coil can be efficiently dissipated by the heat dissipation structure of the coupler
member, so that the input resistance can be improved.
[0050]
According to the diaphragm drive unit of the twentieth aspect, the sound pressure can be
increased by the optimal weight ratio between the drive unit and the movable unit.
[0051]
Moreover, the thin speaker using the diaphragm drive unit of this invention can attain thickness
reduction of a speaker.
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11
[0052]
Next, an embodiment of a diaphragm drive unit according to the present invention and an
embodiment of a thin speaker using the diaphragm drive unit will be described with reference to
specific examples shown in the attached drawings.
[0053]
FIGS. 2 (a) and 2 (b) show a diaphragm drive unit 41 according to a first embodiment of the
present invention, and FIG. 3 is an assembly drawing showing the structure of the diaphragm
drive unit 41 disassembled. is there.
The diaphragm drive unit 41 according to the first embodiment is provided around a flat platelike yoke plate 21, a plurality of permanent magnets 22 disposed on the yoke plate 21, and the
yoke plate 21 as shown in FIG. 3. It is comprised from the leaf spring 23 which is an elastic body,
and the flat coupler member 24 elastically supported by this leaf spring 23.
[0054]
The yoke plate 21 is made of a magnetic material and rectangular (in this embodiment, a square),
on which a plurality of permanent magnets 22 are separated by a predetermined same distance
and opposite in polarity to the adjacent permanent magnets 22. It is arranged to become.
That is, one permanent magnet 22 in 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 in the direction perpendicular to the
magnetization direction, which is square in this embodiment, and the side surfaces of the
adjacent permanent magnets 22 are parallel.
For this reason, since the magnetic lines of force from the N pole of the permanent magnet are
directed to the S pole of the adjacent permanent magnet 22, a parallel magnetic field is
generated between the two permanent magnets 22.
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12
Although three permanent magnets 22 in this embodiment are regularly arranged in the
longitudinal direction and three in the lateral direction, the number of permanent magnets 22 is
not particularly limited, and may be increased or decreased as necessary. it can.
[0055]
A plate spring 23 attached at a position indicated by a two-dot chain line around the yoke plate
21 has a frame-like base 23 b fixed to the yoke plate 21 and an arm extended along the
periphery of the yoke plate 21 from the base 23 b. And a unit 23a.
In this embodiment, the arm portions 23a extend from the four corners of the base 23b in the
direction of the four corners adjacent to the base 23b substantially in parallel.
And the attachment hole 23c is provided in the front-end | tip part of the arm part 23a.
[0056]
On the other hand, the flat coupler member 24 is formed of a resin plate.
Further, mounting holes 24c are provided at four corners of the coupler member 24
corresponding to the mounting holes 23c of the arm portion 23a.
Therefore, the coupler member 24 is attached to the plate spring 23 through the screw 25
inserted from the yoke plate 21 side into the attachment hole 23c of the arm 23a and the hollow
sleeve 26 inserting the screw 25.
When the coupler member 24 is mounted on the yoke plate 21 through the plate spring 23, the
state shown in FIG. 2A is obtained.
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13
Further, in this state, as shown in FIG. 2B, a predetermined distance is provided between the
coupler member 24 and the top surface of the permanent magnet 22.
[0057]
The diaphragm 2 is attached to the front surface of the coupler member 24 as shown in FIG.
As this diaphragm 2, a lightweight and highly rigid one such as a honeycomb plate is used.
Moreover, the diaphragm 2 can also be used as the interior plate of a vehicle.
On the other hand, the coil 27 is disposed on the rear surface of the coupler member 24 to which
the diaphragm 2 is not attached.
When the permanent magnet 22 is disposed on the yoke plate 21 as described in FIG. 3, as
shown in FIG. 2 (b), the magnet 22 on the top face side to the magnet 22 on the top face side
with respect to the magnet 22 on the top face side. A magnetic field is generated in the lateral
direction.
The coil 27 is disposed in the transverse magnetic field in a direction perpendicular to the
magnetic field.
[0058]
The coil 27 is provided at a position corresponding to each of the permanent magnets 22 of the
coupler member 24 and wound in one plane so as to have sides in a direction perpendicular to
the magnetic lines of force between the permanent magnets 22. .
Therefore, the coil 27 provided on the facing surface of one permanent magnet 22 has a
rectangular spiral shape.
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And as shown in FIG.2 (b), the electric current of the same direction flows through the adjacent
edge | side of an adjacent coil.
[0059]
Therefore, 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 ridge start point of the first coil 27 a is connected to the + terminal of the terminal plate 28,
and the ridge end point of the last coil 27 e is connected to the − terminal of the terminal plate
28.
In this way, when the current flows from the start point of the first coil 27s to the end point of
the last coil 27e, currents in the same direction flow in 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 a tinsel wire.
[0060]
FIG. 5 shows the structure of the diaphragm drive unit 42 according to the second embodiment
of the present invention. FIG. 5 (a) shows the coupler member 24 and the sleeve 26 of the
diaphragm drive unit 42 as viewed from the back side. FIG. 7B is a partial cross-sectional view of
the drive unit 42 of the second embodiment.
The diaphragm drive unit 42 of the second embodiment differs from the diaphragm drive unit 41
of the first embodiment only in the structure of the coupler member 24.
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15
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 are given the same reference
numerals.
[0061]
In the diaphragm drive unit 42 of the second embodiment, as shown in FIGS. 5A and 5B, a
portion of the surface of the coupler member 24 facing the permanent magnet 22 that faces the
portion around the permanent magnet 22. However, it bulges by the same height to the
permanent magnet 22 side, and the bulging part 24a is formed.
The bulging portion 24 a has a grid 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.
The coil 27 is disposed on the top surface 24b of the bulging portion 24a, as in the first
embodiment.
The arrangement pattern of the coil 27 may be the same as the pattern shown in FIG.
[0062]
Thus, the coil 27 can be disposed in a portion where the strength of the magnetic field between
the two permanent magnets 22 is strong by providing the bulging portion 24 a in the coupler
member 24 and arranging the coil 27 on the top surface 24 b thereof. it can.
As a result, since the diaphragm drive unit 42 of the second embodiment can effectively utilize
the magnetic flux density generated by the permanent magnet 22, compared with the diaphragm
drive unit 41 of the first embodiment, The driving force can be increased.
[0063]
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16
FIG. 6 shows the structure of the diaphragm drive unit 43 according to the third embodiment of
the present invention. FIG. 6 (a) shows the coupler member 24 and the sleeve 26 of the
diaphragm drive unit 43 as viewed from the front surface side. FIG. 6B is a partial cross-sectional
view of the drive unit 43 of the third embodiment.
The diaphragm drive unit 43 of the third embodiment differs from the diaphragm drive 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 are given the same reference
numerals.
[0064]
In the diaphragm drive unit 43 of the third embodiment, as shown in FIGS. 6A and 6B, a through
hole 29 is formed in a portion of the surface of the coupler member 24 facing the permanent
magnet 22 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 at a portion around the through hole 29.
The arrangement pattern of the coil 27 may be the same as the pattern shown in FIG.
[0065]
Thus, by providing the through hole 29 in the coupler member 24 and arranging the coil 27
around it, the permanent magnet 22 on the yoke plate 21 penetrates the coupler member 24
even if the coupler member 24 vibrates. It does not abut against the coupler member 24 into or
out of the hole 29. Therefore, in the third embodiment, the overall length of the sleeve 26 can be
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17
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 drive unit 42 of the third
embodiment can be thinner than the diaphragm drive unit 41 of the first embodiment.
Furthermore, by providing the through hole 29 in the coupler member 24, the weight reduction
of the coupler member 29 can be achieved, and the sound pressure can be increased.
[0066]
In addition to this, 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 drive unit 43 of the third embodiment can
effectively utilize the magnetic flux density generated by the permanent magnet 22, compared
with the diaphragm drive unit 41 of the first embodiment, The driving force can be increased.
[0067]
FIG. 7 shows the structure of the diaphragm drive unit 44 according to the fourth embodiment of
the present invention, and FIG. 7 (a) 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 a 4th example. The
diaphragm drive unit 44 of the fourth embodiment differs from the diaphragm drive unit 41 of
the first embodiment only in the structure of the yoke plate 21. Therefore, in the diaphragm
drive unit 44 of the fourth embodiment, the same components as those of the diaphragm drive
unit 41 of the first embodiment are given the same reference numerals.
[0068]
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, in this embodiment, all
of the permanent magnets 22 are in the same direction. The south pole is disposed in the
direction of the yoke plate. Then, a portion around the permanent magnet 22 is bulged toward
the permanent magnet 22 by a height substantially the same as that of the permanent magnet 22
to form a bulge portion 21 a. The bulging portion 21 a is in the form of a lattice, and each
permanent magnet 22 is surrounded by the bulging portion 21 a.
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[0069]
In the diaphragm drive unit 44 according to the fourth embodiment, the magnetic lines of force
do not flow from the permanent magnet 22 to the permanent magnet 22 but, as shown in FIG.
7B, from the permanent magnet 22 to the bulging portion 21a of the yoke plate 21. It flows
toward. The coil 27 is disposed in the transverse magnetic field in a direction perpendicular to
the magnetic field. Also in the fourth embodiment, the coils 27 are respectively provided at
positions corresponding to each of the permanent magnets 22 of the coupler member 24 and
have sides in a direction perpendicular to the lines of magnetic force between the permanent
magnets 22 in one plane. It is wound. Therefore, the coil 27 provided on the facing 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 through the adjacent edge | side of an adjacent coil.
[0070]
Therefore, as shown in FIG. 8, 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 in the same winding
direction. The ridge start point of the first coil 27a is connected to the + terminal of the terminal
plate 28, and the ridge end point of the last coil 27e is connected to the + terminal of the
terminal plate 28. In this way, when current flows from the start point of the first coil 27s to the
end point of the last coil 27e, currents of different directions flow in 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.
[0071]
As described above, the diaphragm drive unit 44 of the fourth embodiment can be obtained by
providing the bulging portion 21a surrounding the permanent magnet 22 on the yoke plate 21
and forming the top surface 21b to the same extent as the height of the permanent magnet 22.
Since the magnetic flux density generated by the permanent magnet 22 can be effectively used,
the driving force of the coupler member 24 can be increased as compared with the diaphragm
driving unit 41 of the first embodiment.
[0072]
FIG. 9 (a) shows the structure of the diaphragm drive unit 45 according to the fifth embodiment
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of the present invention, and FIG. 9 (b) shows the structure of a modification thereof.
FIGS. 9A and 9B show only a partial cross-sectional view of the diaphragm drive unit 45 of the
fifth embodiment. The diaphragm drive unit 45 of the fifth embodiment differs from the
diaphragm drive 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. Then, in the embodiment shown in FIG. 9 (a),
the coil 27 is provided on the surface of the diaphragm 2, and in the embodiment shown in FIG.
9 (b), the coil 27 is embedded in the diaphragm 27.
[0073]
The configurations of the yoke plate 21, the permanent magnet 22, the plate spring 23, and the
sleeve 26 in the diaphragm drive unit 45 of the fifth embodiment are the same as those of the
diaphragm drive unit 41 of the first embodiment. Are given the same reference numerals and the
description thereof is omitted. The arrangement pattern of the coil 27 may be the same as the
pattern shown in FIG.
[0074]
Thus, by omitting the coupler member 24, the diaphragm drive unit 45 of the fifth embodiment
can reduce the number of parts and increase the sound pressure by reducing the weight.
[0075]
FIG. 10 (a) shows a speaker configured by attaching the diaphragm 2 to the diaphragm drive unit
46 according to the sixth embodiment of the present invention, and FIG. 10 (b) shows the
speaker shown in FIG. 10 (a). The speaker which attached and comprised the diaphragm 2 to the
diaphragm drive unit 46a of the modification of 6th Example of invention is shown.
[0076]
The diaphragm drive unit 46 of the sixth embodiment of FIG. 10 (a) is a yoke plate having the
same configuration as that of the diaphragm member 24 of the diaphragm drive unit 41 of the
second embodiment of the present invention described in FIG. 21 and permanent magnet 22 are
vertically inverted and attached using a plate spring 23, a sleeve 26, and a screw 25.
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The arrangement pattern of the coil 27 may be the same as the pattern shown in FIG.
Further, since the diaphragm 2 can not be attached to the coupler member 24 in this state, the
coupler member 24 is provided with an extension 24e, and the diaphragm 20 is attached to the
extension 24 using the sleeve 20 and the screw 19 ing.
[0077]
Thus, on the coupler member 24 of the diaphragm drive unit 41 according to the second
embodiment of the present invention, the yoke plate 21 and the permanent magnet 22 having
exactly the same configuration are turned upside down, and the plate spring 23, sleeve 26 and
screw 25 In the diaphragm drive unit 46 of the fifth embodiment attached using the above, the
same poles of the permanent magnets 22 face each other. As a result, since the vertical magnetic
field from the permanent magnet 22 becomes a repulsive magnetic field, the magnetic field is
deflected in the lateral direction, and the lateral magnetic field becomes strong. Therefore, the
magnetic flux passing through the coil 27 is increased, and the magnetic flux can be efficiently
utilized to increase the driving force.
[0078]
The diaphragm drive unit 46a of the modification of the sixth embodiment of FIG. 10 (b) is a
coupler provided with the coil 27 as compared with the diaphragm drive unit 46 of the sixth
embodiment shown in FIG. 10 (a). The opposite side of the surface of the member 24 is the same
except that the coil 27 is disposed. The arrangement pattern of the coils 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, since the number of coils 27 is increased, the magnetic flux can be utilized more
efficiently than the diaphragm drive unit 46 of the sixth embodiment, and the driving force is
further increased.
[0079]
In the first to sixth embodiments of the present invention described above, nine permanent
magnets 22 are disposed on the yoke plate 21 and the same number is provided on the coupler
member 24 or 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
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21
driving force required to drive the diaphragm 2.
[0080]
Furthermore, in the first to sixth embodiments, the plate spring 23 that elastically supports the
coupler member 24 is provided with four arms, but the number of arms of the plate spring 23
and the shape of the arms are made It may be determined appropriately according to the shape
of the speaker to be used.
For example, if the shape of the diaphragm of the speaker is disk-shaped, a leaf spring 17 of
three arms used in the conventional device shown in FIG. 1 may be used as the leaf spring.
However, regardless of the number of arms of the plate spring 23 and the shape of the arms, it is
desirable to make all the stroke amounts under constant load applied to each arm the same.
When the arm lengths are different, the width and thickness of the arms You can change it and
adjust it.
[0081]
FIG. 11 shows an example in which the elastic coefficient of the plate spring 23 is changed. FIG.
11 (a) shows an embodiment in which a hole 23d is opened in the arm 23a of the plate spring
23, FIG. 11 (b) Is an embodiment in which the weight 3 is attached to the arm 23 a of the plate
spring 23. Besides, spacers of various shapes and areas may be interposed between the arm
portion 23 a of the plate spring 23 and the coupler member 23. As described above, if the elastic
coefficient of the plate spring 23 is changed, control of the frequency characteristic of the
diaphragm drive unit and the minimum limit frequency f0 can be performed.
[0082]
Furthermore, 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 23a of the plate spring 23,
and the screwing hole 30 of the coupler member 24 is accommodated. The stroke of the arm
portion 23a of the plate spring 23 can also be changed by providing the screwing holes 31 also
at the positions where the two screwing holes 30, 31 are connected by the screw 25 and the
sleeve 26. . As described above, if the stroke of the plate spring 23 is changed, control of the
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frequency characteristics of the diaphragm drive unit 47 and the minimum limit frequency f0
can be performed.
[0083]
As still another embodiment for changing the stroke of the leaf spring 23, as in the diaphragm
drive unit 48 of the eighth embodiment shown in FIG. 13A, the sleeve 26 provided adjacently is
combined with the first sleeve 26a. The second sleeve 26b is divided into two, and a link plate 32
as shown in FIG. 13 (b) is inserted therebetween, 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 being pinched by the U-shaped clamper 33. In the diaphragm drive unit 48 according to the
eighth embodiment, the lowest limit frequency f0 can be controlled by changing the position of
the clamper 33 for holding.
[0084]
Furthermore, the pattern of the coil 27 used in the embodiment described above is wound in one
plane so as to have sides in a direction perpendicular to the magnetic lines of force between the
permanent magnets. However, it is difficult for magnetic flux to flow in the corners of the coil
pattern. So, in this invention, as shown in FIG. 14, the corner | angular part is formed in circular
arc shape (R part is formed in a corner), and this corner is inserted in a magnetic field. As
described above, by forming R at the corner portion of the winding pattern of the coil 27, the
magnetic flux can be efficiently utilized, and the driving force is increased.
[0085]
By the way, it is known that Joule heat is generated from the coil by the current flowing through
the coil when a drive signal such as an acoustic signal is supplied to the diaphragm drive unit or
the speaker of the first to eighth embodiments described above. There is. At the time of large
input where the current flowing through the coil is large, the physical properties of the resinmade diaphragm may be changed by heat, which may affect the sound quality. Therefore, it is
necessary to diffuse the Joule heat generated from the coil efficiently to suppress the heat
generation from the diaphragm drive unit.
11-05-2019
23
[0086]
FIGS. 15 (a) and 15 (b) show the structure of a diaphragm drive unit 49 according to a ninth
embodiment of the present invention, and the first of the present invention described in FIGS. 2
(a) and 2 (b). The heat dissipating sheet 4 is attached as a heat dissipating member to the surface
of the coupler member 24 of the diaphragm drive unit 41 of the second embodiment opposite to
the surface on which the coil 27 is installed. Therefore, the same code | symbol is attached |
subjected to the same structural member and the description is abbreviate | omitted. For 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 drive unit 49, the heat
dissipating sheet 4 is sandwiched between the diaphragm 2 and the coupler member 24.
[0087]
FIGS. 16 (a) and 16 (b) show the structure of a diaphragm drive unit 50 according to a tenth
embodiment of the present invention, and the first of the present invention described with
reference to FIGS. 2 (a) and 2 (b). A heat dissipating sheet 4 is attached as a heat dissipating
member to the surface of the coupler member 24 of the diaphragm drive unit 41 of the second
embodiment on which the coil 27 is installed, and the coil 27 is disposed on the heat dissipating
sheet 4 It is. Therefore, the same code | symbol is attached | subjected to the same structural
member, and the description is abbreviate | omitted. A copper sheet, an aluminum sheet, a filler
mixed conductive sheet or the like can also be used for the heat dissipating sheet 4.
[0088]
FIGS. 17 (a) to 17 (d) show the structure of a diaphragm drive unit 51 according to an eleventh
embodiment of the present invention, and the first of the present invention described in FIGS. 2
(a) and 2 (b). The heat sink 5 having a large number of fins 5a as a heat dissipating 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 code |
symbol is attached | subjected to the same structural member, and the description is abbreviate |
omitted. Between the heat sink 5 and the coupler member 24, a silicone grease is applied to
increase the thermal conductivity.
[0089]
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24
The heat sink 5 can be formed of a lightweight metal such as aluminum. In the diaphragm 2
attached to the diaphragm drive unit 51 of the eleventh embodiment, the slits 2a are formed in
accordance with the shape of the fins 5a. FIG. 17 (b) shows a state in which the diaphragm 2 is
attached to the diaphragm drive unit 51, and FIG. 17 (c) shows the shape of the fins 5 a of the
heat sink 5. Further, FIG. 17D shows a modified example of the heat sink 5, and is an example in
which a large number of square-pillar-shaped heat dissipation protrusions 5b are provided.
[0090]
18 (a) and 18 (b) show the structure of a diaphragm drive unit 52 according to a twelfth
embodiment of the present invention. The diaphragm drive unit 52 of the twelfth embodiment
has 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. 16 (a) and 16 (b). A heat
sink 5 provided with a large number of fins 5a as a heat dissipating member is attached to the
surface opposite to the surface. Therefore, the same code | symbol is attached | subjected to the
same structural member, and the description is abbreviate | omitted. A silicone grease is applied
between the heat sink 5 and the yoke plate 21 to increase the thermal conductivity.
[0091]
Then, both ends of the heat dissipating sheet 4 stacked between the coil 27 and the coupler
member 24 are extended, and the free end of the extension 4 a is connected to the side surface
of the heat sink 5 attached to the yoke plate 21. As a result, the heat generated by the coil 27 is
conducted to the heat sink 5 through the heat dissipation sheet 4 and the extension 4 a, and is
dissipated from the heat sink 5. In this embodiment, the extended portions 4a of the heat
dissipation sheet 4 are provided on two opposing sides of the heat dissipation sheet 4, but the
extended portions 4a may be provided on any side of the heat dissipation sheet 4 and provided
on at least one side and four sides be able to. In this embodiment, although the heat dissipation
sheet 4 is provided with the extension 4a and connected to the heat sink 5, a heat dissipation
member separate from the heat dissipation sheet 4 may be attached between the heat dissipation
sheet 4 and the heat sink 5 . As this heat dissipation member, there is a copper braided wire or
the like.
[0092]
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25
In the above, the diaphragm drive unit of the present invention and the speaker using this
diaphragm drive unit have been described based on several embodiments. The diaphragm drive
unit according to the present invention comprises a drive unit which is a magnetic circuit
comprising a yoke plate and a magnet, and a movable unit having a coupler member supported
by a plate spring on the drive unit and a coil. The sound pressure generated varies with the ratio
of the weight of the part to the weight of the drive part. 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 is reduced. On the other hand, when the weight ratio of the
movable part to 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 between the movable part
and the drive part is kept between 0.3 and 3, it is possible to prevent the reduction of the sound
pressure. As a result of the experiment, the optimum weight ratio between the movable portion
and the drive portion, in which the sound pressure is high, is in the range of 0.8 to 1.4 where the
working and reaction coins work effectively. The heat sink may be attached to the coupler
member side or the yoke plate side in consideration of the weight balance.
[0093]
The structure of the conventional diaphragm drive unit is shown, (a) is a side view including a
partial cross section of the drive unit attached to the diaphragm, (b) is a diagram of the
diaphragm drive unit of (a) from the back surface side It is a bottom view seen. The 1st Example
of the diaphragm drive unit of this invention is shown, (a) is a perspective view of a drive unit, (b)
is a fragmentary sectional view of the drive unit of 1st Example. It is an assembly drawing which
shows the assembling 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. The 2nd Example of the diaphragm drive unit of this
invention is shown, (a) is the perspective view which looked at the coupler member and sleeve of
a drive unit from the back surface side, (b) is a drive unit of 2nd Example. FIG. The 3rd Example
of the diaphragm drive unit of this invention is shown, (a) is the perspective view which looked at
the coupler member and sleeve of a drive unit from the surface side, (b) is a drive unit of 3rd
Example. FIG. The 4th Example of the diaphragm drive unit of this invention is shown, (a) is the
perspective view which looked at the yoke plate of the drive unit from the front side, (b) is a
partial cross section of the drive unit of 4th Example 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 cross-sectional view of a loudspeaker using
the fifth embodiment of the diaphragm drive unit of the present invention, (b) is a loudspeaker
part using a modification of the fifth embodiment of the diaphragm drive unit of the present
11-05-2019
26
invention FIG. (A) is a partial cross-sectional view of a speaker using the sixth embodiment of the
diaphragm drive unit of the present invention, (b) is a speaker part using a modification of the
sixth embodiment of the diaphragm drive unit of the present invention FIG. 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 the leaf spring, (b) pastes a plate to the arm of a leaf spring. It
shows a modified example. 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 a plane of the link plate
used for 8th Example of a diaphragm drive unit. FIG. 7 shows another embodiment of the
winding shape of a coil used in the diaphragm drive unit of the present invention. 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 a diaphragm drive unit of (a), and the heat dissipation attached to this
It is a perspective view showing a sheet.
The structure of 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 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 to the diaphragm drive unit
of (a). (C) is a perspective view showing an example of a heat sink, (d) is a perspective view
showing another example of the 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 sign
[0094]
Reference Signs List 2 diaphragm 4 heat dissipation sheet 5 heat sink 21 yoke plate 22
permanent magnet 23 plate spring 24 coupler member 25 screw 26 sleeve 27 coil 32 link plate
33 clamper 41 to 52 diaphragm drive unit or speaker according to the embodiment of the
present invention
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