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JP2013128376

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DESCRIPTION JP2013128376
Abstract: To provide a linear actuator with high utilization efficiency of magnetic flux. The two
bond magnets 21 and 22 are formed long and have N and S poles appearing along the
longitudinal direction L, and the two bond magnets 21 and 22 have respective N poles and The
magnet structure 2 is disposed so as to be separated from the other poles of the other bonded
magnets 22 and 21 so as to face the S pole and the two bonded magnets 21 and 22 of the
magnet structure 2. And a wiring board 3 disposed parallel to the longitudinal direction L and
having a conductive wiring pattern 32, and one of the magnet structure 2 and the wiring board 3
is a mover, and the other is The stator serves as a stator, and when the wiring pattern 32 of the
wiring board 3 is energized, the mover is driven to vibrate. [Selected figure] Figure 1
Linear actuator and speaker
[0001]
The present invention relates to a linear actuator and a speaker provided with the linear actuator,
and more particularly to a linear actuator and a speaker in which a wiring board is disposed
perpendicularly to a magnetic flux between two bonded magnets.
[0002]
A conventional linear actuator comprises: strip-like permanent magnets arranged alternately with
different polarities; and a diaphragm in which a voice coil having a serpentine pattern having
straight portions parallel to the longitudinal direction of the permanent magnets is formed on the
surface (See, for example, Patent Document 1).
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[0003]
In the linear actuator thus configured, the voice coil is generated by the Lorentz force that the
magnetic flux between adjacent permanent magnets acts between the magnetic flux of the
portion (neutral zone) parallel to the diaphragm and the current flowing through the voice coil. Is
driven in a direction perpendicular to the diaphragm.
[0004]
JP, 2010-103629, A
[0005]
However, in the conventional linear actuator, since the magnetic flux density of the magnetic flux
in the neutral zone is smaller than the surface magnetic flux density of the permanent magnet,
there is a problem that the utilization efficiency of the magnetic flux is low.
[0006]
Then, the present invention solves the above-mentioned problem and provides a linear actuator
with high utilization efficiency of magnetic flux.
[0007]
The linear actuator according to the present invention is formed in a long shape, and includes
two bonded magnets in which an N pole and an S pole appear along the longitudinal direction,
and the two bonded magnets include the N pole and the S pole respectively. A wire that is
disposed parallel to the longitudinal direction between the two bond magnets of the magnet
structure and a magnet structure that is spaced apart to face the other pole of the other bond
magnet and that can be energized And a wiring board having a pattern, wherein one of the
magnet structure and the wiring board is a mover, the other is a stator, and the wiring pattern of
the wiring board is energized. Thus, the mover is driven to vibrate.
[0008]
Also, a speaker according to the present invention comprises the linear actuator according to the
present invention.
[0009]
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According to the linear actuator of the present invention, two bonded magnets are spaced apart
so that the N pole and the S pole of the two bonded magnets face each other, and the two bonded
magnets are interposed between the two bonded magnets. By arranging a wiring board having a
conductive wiring pattern, it is possible to suppress a decrease in the magnetic flux density of the
magnetic flux passing through the wiring pattern.
Therefore, the utilization efficiency of magnetic flux can be improved.
Moreover, according to the speaker by this invention, the utilization efficiency of magnetic flux
can be improved by providing the linear actuator by this invention.
[0010]
FIG. 1 is a partially broken schematic perspective view showing a first embodiment of a linear
actuator according to the present invention.
It is the AA line plane sectional view of the said 1st Embodiment.
It is a schematic perspective view which shows the magnet structure of the said 1st Embodiment,
and a wiring board.
It is a BB line front sectional view of the said 1st Embodiment.
It is a top view which shows the wiring pattern of the wiring board of the said 1st Embodiment.
It is a top view which shows only the wiring pattern of the surface of the wiring board of FIG.
FIG. 6 is a plan view showing only the wiring pattern on the back surface of the wiring board of
FIG. 5; It is a top view which shows other embodiment of the said wiring board. It is front
sectional drawing which shows 2nd Embodiment of the linear actuator by this invention. It is a
plane sectional view showing the second embodiment. It is an expanded view which shows the
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flexible member of cross-sectional square C-shaped shape of said 2nd Embodiment. It is an
expanded view which shows the other example of the said flexible member. It is an expanded
view which shows the further another example of the said flexible member. It is front sectional
drawing which shows 3rd Embodiment of the linear actuator by this invention. It is a top view
which shows the said 3rd Embodiment. It is front sectional drawing which shows 4th
Embodiment of the linear actuator by this invention. It is a plane sectional view showing the 4th
embodiment.
[0011]
Hereinafter, embodiments of the present invention will be described in detail based on the
attached drawings. In FIG. 1, the linear actuator includes a mover and a stator, and linearly drives
the mover by Lorentz force acting between the magnetic flux and the current. The linear actuator
is configured to include a housing 1, a magnet structure 2, a wiring board 3, and a diaphragm 4.
In the present embodiment, the magnet structure 2 is a stator, and the wiring board 3 is a mover.
[0012]
As shown in FIG. 1, the housing 1 has a substantially rectangular parallelepiped shape with an
open top, and includes a bottom wall 11 and a side wall 12. On the upper surface of the bottom
wall 11, as shown in FIG. 2, a plurality of magnet structures 2 are arranged in parallel along the
wiring board 3 at intervals. The magnet structure 2 is used as a stator of a linear actuator in the
present embodiment, and includes a first bond magnet 21 and a second bond magnet 22 as
shown in FIG.
[0013]
The bond magnets 21 and 22 are long as shown in FIG. 3 and both have N poles and S poles
appearing along the longitudinal direction L, and the magnetic lines of force inside are S It is
oriented in an arc shape from the pole to the N pole. These bond magnets 21 and 22 are
disposed apart from each other so that the N pole and the S pole of the bond magnets 22 and 21
face each other, respectively. The S pole of the 2 bond magnet 22 faces, and the S pole of the 1st
bond magnet 21 and the N pole of the 2nd bond magnet 22 face. As a result, between the first
bond magnet 21 and the second bond magnet 22, the lines of magnetic force are in a direction
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perpendicular to the longitudinal direction L, and the magnetic flux density of this portion is
approximately equal to the surface magnetic flux density of the bond magnets 21, 22. Become.
[0014]
The shape of each bonded magnet 21 and 22 can be formed into any shape according to the
application, but it is preferable that the shape is such that the permeance coefficient Pc is large
(the demagnetizing factor N is small), for example, It is preferable to form a thin flat plate having
a pitch P of 8 mm or more and a width W of 2.5 mm or more between the N pole and the S pole.
The lower ends of the bond magnets 21 and 22 are fixed to the upper surface of the bottom wall
11 of the housing 1 by an adhesive or the like so that the longitudinal direction L is
perpendicular to the bottom wall 11 as shown in FIG. It is done.
[0015]
The wiring board 3 is disposed between the first bonded magnet 21 and the second bonded
magnet 22 of the magnet structure 2. The wiring board 3 is a substantially rectangular plate-like
member used as a mover of a linear actuator in the present embodiment, and its upper end is
formed parallel to the bottom wall 11 of the housing 1. The wiring board 3 is disposed between
the bond magnets 21 and 22 in parallel with the longitudinal direction L and perpendicular to
the magnetic lines of force between the respective magnet structures 2, and provided two in
parallel on the left and right sides of the linear actuator There is.
[0016]
As shown in FIG. 5, on the front surface 31f and the back surface 31r of the wiring board 3,
wiring patterns 32 which can be energized are formed. The linear actuator in this embodiment
drives and vibrates the wiring board 3 which is a mover by energizing the wiring pattern 32.
When a current flows in the wiring pattern 32, a Lorentz force is generated between the flowing
current and the magnetic flux between the magnetic poles of the magnet structure 2, and the
wiring board 3 is driven linearly along the longitudinal direction L. The direction in which the
wiring board 3 is driven is determined according to the direction of the current and the direction
of the magnetic flux between the magnet structures 2 in accordance with Fleming's left-hand
rule. By alternately changing the direction of the current flowing through the wiring pattern 32,
the driving direction of the wiring board 3 is alternately changed, and the wiring board 3 vibrates
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in the longitudinal direction L.
[0017]
As shown in FIG. 5, the wiring pattern 32 formed on the front surface 31 f and the back surface
31 r of the wiring board 3 has a first spiral portion 33, a first linear portion 34, a second spiral
portion 35, and a second spiral portion 35. And 2 straight portions 36. The first spiral portion 33
is formed in a spiral shape so as to surround the central portion of the wiring board 3 along the
outer shape of the wiring board 3. The outer end 33 a of the first spiral portion 33 is linearly
connected to the central portion of the wiring board 3 by the first straight portion 34, and the
first straight portion 34 of the first spiral portion 33 is formed. A part including the intersection
point is wired to the back surface 31 r of the wiring board 3 and the remaining part is wired to
the front surface 31 f.
[0018]
As shown in FIG. 6, an open portion 38 in which the first spiral portion 33 is wired to the back
surface 31 r is formed on the front surface 31 f of the wiring board 3. On the surface 31 f of the
wiring board 3, a first spiral portion 33 formed in a spiral shape in which a part (the inner side of
the open portion 38) is broken, a first linear portion 34, and a second linear portion 36 , Are
wired. The portion wired on the front surface 31 f of the first spiral portion 33 and the portion
wired on the back surface 31 r are electrically connected through the through holes 37.
[0019]
As shown in FIG. 5, the inner end 33b of the first spiral portion 33 is electrically connected to the
inner end 35b of the second spiral portion wired on the back surface 31r of the wiring board 3
and the through hole 37b. It is connected to the. As shown in FIG. 7, the second spiral portion 35
is formed in a spiral in the same direction as the first spiral portion 33 along the outer shape of
the wiring board 3. Therefore, when current flows in the wiring pattern 32, Lorentz force in the
same direction is generated between the first linear portion 33 and the second linear portion 35.
[0020]
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The second spiral portion 35 and the inner portion of the open portion 38 of the first spiral
portion 33 are wired on the back surface 31 r of the wiring board 3. The outer end 35 a of the
second spiral portion 35 is electrically connected to the second linear portion 36 wired on the
surface 31 f of the wiring board 3 via the through hole 37 a. The second linear portion 36 is
connected to the central portion of the surface 31 f of the wiring board 3 through the open
portion 38 formed on the surface 31 f of the wiring board 3.
[0021]
A first terminal 39a and a second terminal 39b which are terminals of the wiring pattern 32 are
provided at the central portion of the surface 31f, and the outer end 33a of the first spiral
portion 33 and the first terminal 39a are the first The outer end 35 a of the second spiral portion
35 and the second terminal 39 b are connected linearly by the second linear portion 36.
[0022]
As shown in FIG. 4, the diaphragm 4 is fixed to the upper end portion of the wiring board 3.
The diaphragm 4 is a flat plate-like member that vibrates in the driving direction of the wiring
board 3 by driving the wiring board 3 which is a mover. The diaphragm 4 is connected to the
inner peripheral edge of the upper end portion of the housing 1 via the edge 5 as shown in FIGS.
The edge 5 is made of urethane, rubber, silicon or the like, and holds the diaphragm 4 at a
predetermined position.
[0023]
The linear actuator in this embodiment is used to drive the mover because the magnetic flux
density between the first bond magnet 21 and the second bond magnet 22 is substantially equal
to the surface magnetic flux density of the bond magnets 21 and 22. The reduction of the
magnetic flux density of the magnetic flux can be suppressed, and the utilization efficiency of the
magnetic flux can be improved.
[0024]
The bonded magnets 21 and 22 in this embodiment can be formed, for example, by injection
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molding a mixture of a base material such as rubber, vinyl chloride or plastic, and a magnetic
material such as samarium iron nitrogen magnet. .
Therefore, the bond magnets 21 and 22 are lighter in weight than sintered magnets such as
neodymium used in conventional linear actuators, and the weight of the linear actuators can be
reduced.
[0025]
Further, the linear actuator in the present embodiment can reduce the weight because a yoke
made of a metal such as iron becomes unnecessary by the improvement of the above-mentioned
orientation of magnetic lines of force of the bond magnets 21 and 22 and utilization efficiency of
magnetic flux.
[0026]
Moreover, since the linear actuator in the present embodiment can widen the range R having the
magnetic flux density that can be used to drive the mover in the longitudinal direction L as
compared with the neutral zone of the conventional linear actuator, The stroke of the mover can
be lengthened.
[0027]
In addition, since the wiring board 3 in the present embodiment can be formed by injection
molding a resin such as plastic, it can be lightweight and easily manufactured.
Further, the wiring board 3 is driven by the Lorentz force between the plurality of magnet
structures 2.
Therefore, the magnetic flux density per one of the magnet structures 2 and the current flowing
through the wiring pattern 32 of the wiring board 3 required for driving the wiring board 3 can
be reduced.
[0028]
Further, in the linear actuator according to the present embodiment, since the terminals 39a and
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39b are disposed at the central portion of the wiring board 3, the deviation of the center of
gravity of the wiring board 3 can be prevented, and the wiring board 3 is driven stably. be able
to.
[0029]
Although the open portion 38 is formed on the left side of the wiring board 3 in the present
embodiment, the open portion 38 can be provided at any place on the surface 31 f by adjusting
the position of the through hole 37.
The open portion 38 is preferably provided in a portion which does not contribute to the drive of
the wiring board 3, that is, a portion which does not contribute to the generation of the Lorentz
force, and is preferably provided on either the left side or the right side of the wiring board 3.
[0030]
Furthermore, the through hole 37 b connecting the inner end 33 b of the first helical portion 33
and the inner end 35 b of the second helical portion 35 can be formed at any position outside the
open portion 38, A through hole 38 a connecting the outer end 35 a of the second spiral portion
35 and the second straight portion 36 may be formed inside the open portion 38.
[0031]
FIG. 8 is a plan view showing another embodiment of the wiring board 3.
As shown in FIG. 8, in the present embodiment, convex portions are formed on the left and right
ends of the lower end portion of the wiring board 3. A first terminal 39a and a second terminal
39b are provided side by side on one of the convex portions. The first terminal 39a is connected
to the outer end 33a of the first spiral portion 33, and the second terminal 39b is connected to
the outer end 35a of the second spiral portion 35 through the through hole 37a. Although the
first terminal 39a and the second terminal 39b are both provided on the left side convex part,
they may be provided on the right side convex part, and may be separately provided on the left
and right convex parts.
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[0032]
Next, a second embodiment of the linear actuator according to the present invention will be
described with reference to FIGS. The linear actuator includes a housing 1, a magnet structure 2,
wiring boards 3 a and 3 b, and a diaphragm 4. In the present embodiment, the wiring board 3 is
a mover, and the magnet structure 2 is a stator.
[0033]
The wiring boards 3 a and 3 b are configured to include the flexible member 6. The flexible
member 6 is formed in a U-shaped cross section opened downward in the longitudinal direction
L, and has a pair of facing surfaces 61 parallel to the longitudinal direction L forming the wiring
boards 3a and 3b, and the pair And a connecting surface 62 perpendicular to the longitudinal
direction L connecting the surfaces 61 of the two. That is, the two wiring boards 3 a and 3 b
arranged in parallel are integrally formed by the flexible member 6.
[0034]
As shown in FIG. 10, the two wiring boards 3a and 3b integrally formed by the flexible member 6
are arranged in parallel in two sets, and the magnet structure 2 is spaced apart for each wiring
board 3 It is arranged in parallel. The diaphragm 4 is fixed on the connection surface 62 of the
flexible member 6, as shown in FIG.
[0035]
As shown in FIG. 11, the two wiring boards 3a and 3b integrally formed by the flexible member 6
each include a first terminal 39a, a second terminal 39b, and a wiring pattern 32. The wiring
patterns 32 respectively wired to the wiring boards 3a and 3b are not electrically connected.
[0036]
As shown in FIG. 13, on the connection surface 62 of the flexible member 6, a pattern region 63
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formed in a triangular shape in a plan view by copper foil is provided. Thereby, the mechanical
strength of the connection surface 62 can be improved. In addition, this pattern area | region 63
is not restricted to copper foil, You may form with another metal. Moreover, the planar view
shape of the pattern area | region 63 is not restricted to triangle shape, It can be set as arbitrary
shapes, such as a quadrangle and a circle.
[0037]
FIG. 12 is a developed view showing another embodiment of the flexible member 6. As shown in
FIG. 12, in the wiring boards 3a and 3b, one wiring board 3a includes the first terminal 39a and
the wiring pattern 32, and the other wiring board 3b includes the second terminal 39b and the
wiring pattern 32. The wiring pattern 32 a of the wiring board 3 a and the wiring pattern 32 b of
the wiring board 3 b are electrically connected via the connection surface 62 of the flexible
member 6.
[0038]
With such a configuration, the flexible member 6 in the present embodiment can have one
terminal each of the wiring boards 3a and 3b, so the number of parts can be reduced. Therefore,
the linear actuator can be reduced in weight and manufactured inexpensively.
[0039]
FIG. 13 is a developed view showing still another embodiment of the flexible member 6. As
shown in FIG. 13, in the wiring boards 3a and 3b, one wiring board 3a includes the first terminal
39a, the second terminal 39b, and the wiring pattern 32, and the other wiring board 3b includes
only the wiring pattern 32b. . The wiring pattern 32 a of the wiring board 3 a and the wiring
pattern 32 b of the wiring board 3 b are electrically connected via the connection surface 61 of
the flexible member 6.
[0040]
A third embodiment of a linear actuator according to the present invention will be described with
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reference to FIGS. The linear actuator includes a housing 1, magnet structures 2a and 2b, and
wiring boards 3a and 3b. As shown in FIG. 15, in the housing 1 of the present embodiment, a
part of the side wall 12 is configured by the first bond magnet 21 a of the magnet structure 2 a
and the second bond magnet 22 b of the magnet structure 2 b.
[0041]
As shown in FIG. 14, the magnet structures 2a and 2b are provided on the left and right sides of
the linear actuator, and the first bond magnet 21a of the left magnet structure 2a and the second
bond magnet 22b of the right magnet structure 2b Is a part of the side wall 12, and is longer in
the longitudinal direction L than the second bond magnet 22a of the magnet structure 2a and the
first bond magnet 21b of the magnet structure 2b.
[0042]
Similar to the wiring boards 3a and 3b of the second embodiment, the wiring boards 3a and 3b
include the flexible material 6 having a U-shaped cross section, and the connecting surface 62 of
the flexible material 6 is a diaphragm. Play a role as four.
Therefore, the diaphragm 4 as a separate member is not provided on the connection surface 62.
The outer peripheral edge of the connection surface 62 is connected to the side wall 12 of the
housing 1 by the edge 5.
[0043]
Since the linear actuator in the present embodiment does not require the diaphragm 4 as a
separate member, the number of parts of the linear actuator can be reduced, the weight of the
linear actuator can be reduced, and it can be manufactured inexpensively.
[0044]
A fourth embodiment of the linear actuator according to the present invention will be described
with reference to FIGS.
The linear actuator includes a housing 1, a magnet structure 2, a wiring board 3, and a
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diaphragm 4. The magnet structure 2 is a mover, and the wiring board 3 is a stator.
[0045]
As shown in FIG. 16, on the bottom wall 11 of the housing 1, a substrate 7 having a conductive
pattern is provided. As shown in FIG. 17, four wiring boards 3 are arranged in parallel on the
upper surface of the substrate 7. A connector 8 is provided at a connection portion between the
wiring board 3 and the substrate 7, and the wiring pattern of the four wiring boards 3 and the
substrate pattern of the substrate 7 are electrically connected by the connector 8, and the whole
is completed. Form one circuit.
[0046]
As shown in FIG. 17, a plurality of magnet structures 2 are provided in parallel at intervals to the
four wiring boards 3 respectively, and the upper end portions of these magnet structures 2 are
shown in FIG. As shown at 16, it is fixed to the lower surface of the diaphragm 4. The outer
peripheral edge of the diaphragm 4 is connected to the inner peripheral edge of the upper end of
the side wall 12 of the housing 1 by the edge 5.
[0047]
In the linear actuator according to the present invention described above, the housing 1 is not
limited to the rectangular parallelepiped shape, and can be formed into another shape such as a
cylindrical shape, for example. The housing 1 can be made of plastic, wood, metal or the like, and
preferably the bottom wall 11 and the side wall 12 of the housing 1 are made of the same
material, but may be made of different materials.
[0048]
The magnet structures 2 according to the present invention are preferably arranged at equal
intervals along the wiring board 3. The orientation of the lines of magnetic force in each of the
bond magnets 21 and 22 of the magnet structure 2 is not limited to the arc shape, and the lines
of magnetic force between the bond magnets 21 and 22 may be oriented in a direction
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perpendicular to the longitudinal direction L. . In the bond magnets 21 and 22, one set of N pole
and S pole appears along the longitudinal direction L, but a plurality of sets may appear
alternately along the longitudinal direction L.
[0049]
The wiring board 3 according to the present invention is not limited to a substantially
rectangular shape, and can have an arbitrary shape corresponding to the shape of the housing 1
or the like. The number of the wiring boards 3 to be arranged can also be set arbitrarily. The
number of times the spiral portions 33 and 35 of the wiring pattern 32 formed on the wiring
board 3 are wound along the outer shape of the wiring board 3 can be determined according to
the size of the wiring board 3 and the width of the wiring pattern 32 It is preferable that it be
repeated.
[0050]
The diaphragm 4 according to the present invention can be formed of pulp, plastic, ceramic,
metal or the like. The diaphragm 4 is not limited to a flat plate shape, and may be a dome shape,
a cone shape, or the like.
[0051]
The linear actuator according to the present invention described above can be used, for example,
as a speaker such as a dynamic speaker or a plane wave speaker by selecting the shape of the
diaphragm 4. When the linear actuator according to the present invention is used for a speaker,
the linear actuator drives the mover according to the electrical signal inputted to the wiring
pattern of the wiring board 3, and the connecting surface 61 of the diaphragm 4 or the flexible
member 6. Vibrate to generate sound waves. In the speaker according to the present invention,
since there is no stator in front of the moving direction of the mover (the side to send the sound
wave), the sound wave can be well transported. By using the linear actuator according to the
present invention, a lightweight and inexpensive speaker can be manufactured. The linear
actuator according to the invention may be used in a sensor such as a pressure sensor.
[0052]
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DESCRIPTION OF SYMBOLS 1 ... Casing 11 ... Bottom wall 12 ... Side wall 2, 2a, 2b ... Magnet
structure 21, 21a, 21b ... 1st bonded magnet 22, 22a, 22b ... 2nd bonded magnet 3, 3a, 3b ...
Wiring board 31f ... Wiring board surface 31r ... Wiring board back surface 32, 32a, 32b ...
Wiring pattern 33 ... First helical portion 33a ... Outer end of first helical portion 33b ... Inner end
of first helical portion 34 ... The fourth 1 linear portion 35 second helical portion 35a outer end
of second helical portion 35b inner end of second helical portion 36 second linear portion 37,
37a, 37b through hole 38 Open part 39a-first terminal 39b-second terminal 4-diaphragm 5-edge
6-flexible member 61-pair of faces 62-connection surface 63-pattern area 7-substrate 8connector P-pitch W-width Pc ... Permians N ... anti-magnetic field coefficient
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