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JP2016040901

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2016040901
Abstract: The present invention provides an energy conversion device that can be easily attached
to various structures and can improve the energy conversion efficiency. A permanent magnet
fixed in a predetermined area, a coil formed of a conductive wire pattern, a diaphragm disposed
on the permanent magnet, and a slit formed in the diaphragm . [Selected figure] Figure 8
Energy conversion device and speaker structure
[0001]
The present invention relates to an energy conversion device that mutually converts electrical
energy and mechanical energy.
[0002]
Speakers and microphones are energy conversion devices that mutually convert electrical energy
and mechanical energy.
In the speaker, by vibrating a coil disposed close to the permanent magnet by an electromagnetic
force, a diaphragm fixed to the coil vibrates air to generate a sound wave. On the other hand, in
the microphone, by vibrating the diaphragm with sound waves, current flows to the coil linked to
the diaphragm by the action of electromagnetic induction.
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[0003]
Conventionally, in the speakers, those adopting a cone-type diaphragm have been the
mainstream, but in recent years, thin-type speakers (so-called flat speakers) adopting a flat-plateshaped diaphragm have attracted attention (for example, See Patent Document 1 etc.).
[0004]
The flat loudspeakers described above are valuable depending on the application, but they are
limited in the place where they are attached, and there are also aspects that are not sufficient in
the energy conversion efficiency.
[0005]
The present invention has been proposed in view of the above-mentioned conventional problems,
and its object is to provide an energy conversion device which can be easily attached to various
structures and can enhance the energy conversion efficiency. To provide.
[0006]
In order to solve the above-mentioned problems, according to the present invention, a permanent
magnet fixed in a predetermined area, and a coil formed of a conductor pattern are formed, and a
diaphragm is disposed on the permanent magnet. And a slit is formed in the diaphragm.
[0007]
In the present invention, it is possible to provide an energy conversion device which can be easily
attached to various structures and can increase the energy conversion efficiency.
[0008]
It is a figure which shows the example of the structure to which a speaker structure is attached.
It is a figure which shows the example of a diaphragm and a permanent magnet.
It is a figure which shows the example of the procedure which produces a speaker structure.
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It is sectional drawing of a speaker structure.
It is sectional drawing of the speaker structure which added the improvement.
It is a figure which shows the example of the structure of a bobbin type. It is a figure which
shows the example of the diaphragm made to respond | correspond to the structure of a bobbin
type. It is a figure which shows the example of a speaker structure. It is a figure which shows the
example of the change of the sound pressure with respect to slit length. It is a figure which
shows the example of a slot antenna. It is a figure which shows the example of distributions, such
as a voltage of a half wavelength antenna. It is a figure which shows the example of the sound
pressure change with respect to the frequency by the width change of a diaphragm. It is a figure
(the 1) showing an example of a speaker structure. It is a figure (the 2) showing an example of a
speaker structure. It is a figure (the 3) showing the example of the speaker structure. It is a figure
which shows the example of the sound pressure change with respect to the frequency by slit
width change of a diaphragm. It is a figure which shows the example of the measuring method of
directivity characteristic. It is a figure which shows the example of the measurement result of a
directional characteristic. It is a figure which shows the example which has arrange | positioned
the slit in the longitudinal direction and the orthogonal direction to this. It is a figure which
shows the example of the measurement result of a sound pressure characteristic. It is a figure
which shows the example of the cross section of a diaphragm, a sheet | seat, a rubber magnet,
and a base. It is a figure which shows a mode when heat is added to a sheet | seat and a rubber
magnet. It is a figure which shows the example of the measurement result of the frequency
characteristic of a speaker structure.
[0009]
Hereinafter, preferred embodiments of the present invention will be described. Although the
embodiment of the speaker structure is described as the energy conversion device, the present
invention is also applicable to other energy conversion devices such as a microphone and a fan,
and is not limited to the illustrated embodiment. Further, in the drawings referred to below, the
same reference numerals are used for the common elements, and the redundant description will
be omitted as appropriate. In addition, the scale of the members described in each drawing
should be referred to as being deformed as necessary.
[0010]
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<Basic Configuration Example> FIG. 1 is a view showing an example of a structure 50 to which a
speaker structure (100) is attached, and shows a cylindrical example. In this case, the curved
surface (peripheral surface) of the cylindrical structure 50 is an area to which the speaker
structure is attached. As a specific example in which the cylindrical structure 50 is used as the
attachment area, a socket portion of a straight tube fluorescent lamp, and the like can be given.
The structure 50 to which the speaker structure is attached is not limited to the illustrated
cylindrical shape, and may be, for example, a curved surface obtained by bending a rectangle.
Furthermore, it may be spherical, and a structure having a curved surface can be targeted.
[0011]
Next, a procedure for additionally attaching the speaker structure to the structure 50 will be
described.
[0012]
First, the diaphragm 10 shown in FIG. 2B and the permanent magnet 20 shown in FIG. 2A are
prepared.
[0013]
The diaphragm 10 can be configured by a flexible substrate 12 having a thickness of about 10 to
30 μm.
The flexible substrate 12 preferably has a flexural modulus of about 2000 to 3000 MPa, and, for
example, ethylene terephthalate (PET), polyimide, polyethylene naphthalate (PEN) or the like can
be adopted.
[0014]
The flexible substrate 12 is an oblong rectangular in shape, and its width is preferably set to an
appropriate length equal to or less than the length of the structure 50 (FIG. 1), and the length is
It is preferable to set it to a suitable length approximately equal to the circumference of the body
50.
[0015]
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The coil 14 is formed on one surface (the back surface in the illustrated example) on the flexible
substrate 12.
The coil 14 is a conductor pattern formed in a meandering or pulse shape, and conductors
extending in the width direction of the flexible substrate 12 are formed at a constant pitch P.
For example, the conductor pattern can be formed by wet etching the flexible substrate 12 with
copper foil or printing copper paste on the flexible substrate 12 by screen printing. Furthermore,
the coil 14 is provided with a plus terminal 14 a and a minus terminal 14 b for connection to a
drive signal source.
[0016]
In addition, the flexible substrate 12 is provided with square slits 16 of a predetermined size and
number. The slits 16 improve the level of sound pressure output as a speaker and reduce the
directivity. Specific examples of the size and number of the slits 16 will be described later. The
slits 16 may be formed by punching or may be formed by drilling.
[0017]
The permanent magnet 20 is in the shape of a vertically long rectangle, and the width and length
thereof are set to appropriate lengths in accordance with the width and length of the conductor
pattern of the coil 14 of the diaphragm 10, respectively. The permanent magnet 20 is preferably
made of a sheet-like bond magnet (rubber magnet) so that the shape can be freely deformed
according to the shape of the curved surface of the structure 50 (FIG. 1). In addition, as the
permanent magnet 20, a ferrite magnet, a neodymium magnet, an alnico magnet, a samarium
cobalt magnet etc. can be used, It is more preferable to use a strong neodymium magnet.
[0018]
In addition, a parallel stripe-shaped magnetized pattern is formed on the permanent magnet 20
so that strip-like N and S poles extending in the width direction appear alternately. The pitch P of
this magnetized pattern is formed on the diaphragm 10 It is comprised so that it may become
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equal to the pitch P of the coil 14 to be carried out.
[0019]
After the diaphragm 10 and the permanent magnet 20 described above are prepared, the
permanent magnet 20 is fixed so as to be wound along the outer peripheral surface of the
structure 50, as shown in FIG. 3 (a).
A recess corresponding to the thickness of the permanent magnet 20 may be formed on the
outer peripheral surface of the structure 50, and the permanent magnet 20 may be embedded in
the structure 50.
[0020]
Thereafter, as shown in FIG. 3B, the buffer film 30 is disposed so as to cover the entire surface of
the permanent magnet 20. The arrangement of the buffer film 30 avoids the fixation of the
diaphragm 10 and the permanent magnet 20 and the divided vibration of the diaphragm 10, and
secures a movable range necessary for the diaphragm 10 to vibrate with a sufficient amplitude.
[0021]
The buffer film 30 is made of a flexible nonmagnetic material, and is interposed between the
permanent magnet 20 and the diaphragm 10 to keep the distance between the two constant. The
buffer film 30 preferably has a thickness of several μm to several hundreds of μm, and can be
made of, for example, cellulose fibers such as Japanese paper, clean paper, clean wipe, etc., and
be made of an elastic material such as rubber. You can also.
[0022]
Finally, as shown in FIG. 3C, after the diaphragm 10 is rounded (curved) in the longitudinal
direction and placed on the buffer film 30 so as to cover the permanent magnet 20, the
diaphragm 10 can be appropriately fixed. The members 15 are used to secure both ends of the
diaphragm 10 to the surface of the structure 50.
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[0023]
At this time, the diaphragm 10 is set so that the conductor pattern extending in the width
direction of the coil 14 of the diaphragm 10 coincides with the boundary between the
magnetized patterns of the N pole and the S pole of the permanent magnet 20 located below the
diaphragm 10. It is desirable to position and fix on the surface of the structure 50.
[0024]
FIG. 4A shows a cross-sectional view taken along the line AA 'of the speaker structure 100 shown
in FIG. 3C completed through the above-described procedure, and FIG. 4B shows the cross
section in FIG. The enlarged view of the part enclosed with a broken line is shown.
[0025]
In FIG. 4B, among the magnetic field components of magnetic lines of force passing in a circular
arc shape from the N pole to the S pole on the surface of the permanent magnet 20, it greatly
contributes to the electromagnetic force to the coil 14 formed on the diaphragm 10. Is a
component parallel to the surface of the permanent magnet 20, this parallel component becomes
maximum near the boundary of the magnetized patterns of the N pole and the S pole.
[0026]
In the present embodiment, when an alternating current is supplied to the coil 14 to generate a
magnetic field, a repulsive force is generated in the coil 14 according to the law of Fleming's left
hand, and the diaphragm 10 has a normal to the surface of the structure 50. Swing in the
direction.
As described above, when the conductor pattern extending in the width direction of the coil 14 is
positioned to coincide with the boundary between the N pole and the S pole of the permanent
magnet 20, the diaphragm 10 vibrates with maximum efficiency, and the speaker application As
necessary to generate sufficient sound pressure.
[0027]
The magnetized pattern of the permanent magnet 20 and the conductor pattern formed on the
coil 14 are not limited to the above-described embodiment, and in such an embodiment, when
the coil 14 is energized, a repulsive force by the electromagnetic force is generated. Good.
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[0028]
FIG. 5 is a cross-sectional view of the improved speaker structure 100, showing a partial crosssectional view at the same position as FIG. 4 (b).
FIG. 5A shows an embodiment in which conductor patterns of the coil 14 are formed on both
sides of the flexible substrate 12 in the diaphragm 10.
According to this embodiment, as a result of the magnetic field generated by energization
becoming larger, the amplitude increases and a larger sound pressure is generated.
[0029]
FIG. 5 (b) shows an embodiment in which a high permeability sheet 40 made of a high
permeability material is disposed between the permanent magnet 20 and the structure 50.
According to the present embodiment, the presence of the high magnetic permeability sheet 40
reduces the leakage magnetic field on the back side (the structure 50 side) of the permanent
magnet 20, and the leakage magnetic field on the coil 14 side of the diaphragm 10 increases. The
sound pressure is increased and a larger sound pressure is generated.
[0030]
<Practical Configuration Example> FIG. 6 is a view showing an example of a bobbin type
structure 50, FIG. 6 (a) is an external perspective view, and FIG. 6 (b) is from the B direction of
FIG. It is a front view seen.
Although the example of a dimension assumes the case where it uses for the socket part of a
straight tube fluorescent lamp, etc., it is not restricted to this dimension.
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[0031]
The bobbin type structure 50 has, on the surface of the hollow cylindrical main body, the first
groove 51 in which the permanent magnet (20) is embedded, and the diaphragm (along with the
arc-shaped opposite end portions) A second groove 52 for forming a space is provided
immediately below the slit (16) of 10). Further, at the circumferential end of the convex portion
forming the first groove 51, a locking portion 53 for fixing the diaphragm 10 is provided.
[0032]
As a material of the structure 50, ABS (acrylonitrile butadiene styrene), PC (polycarbonate), PEEK
(polyether ether ketone), etc. can be used. ABS is inexpensive and has superior surface hardness
and impact resistance compared to PP (polypropylene) and PE (polyethylene). Since PC has wellbalanced mechanical properties, good dimensional accuracy, and low water absorption, it is
excellent in dimensional stability and has very high impact resistance and very good electrical
characteristics. PEEK has well-balanced mechanical properties, good dimensional accuracy, and
low water absorption, so it is excellent in dimensional stability. This time, ABS was used in
consideration of cost. As a processing method, any of cutting and forming can be used, but this
time, the whole and grooves were processed by cutting.
[0033]
FIG. 7 is a view showing an example of the diaphragm 10 corresponding to the bobbin type
structure 50, and the central coil portion is not shown. Further, the locking holes 17 are provided
at the end in the longitudinal direction, and a total of eight slits 16 are provided on each of the
two sides in the longitudinal direction. The permanent magnet (20) is the same as that shown in
FIG.
[0034]
FIG. 8 is a view showing an example of the speaker structure 100, and in the bobbin type
structure 50 shown in FIG. 6, the permanent magnet 20 shown in FIG. 2A and the diaphragm 10
shown in FIG. , One attached sequentially. The permanent magnet 20 was adhered to the first
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groove 51 of the structure 50 with an adhesive. For adhesion, an epoxy resin (one-component
heat-curable adhesive (IW2010)) was used, temporarily cured at 80 ° C. for 10 minutes, and left
at room temperature for 2 days to cure. The adhesive is not limited and may be any material that
can withstand a reliability test (heat cycle test etc.).
[0035]
As understood from FIG. 6 (b), a wall of ABS resin is formed between the first groove 51 and the
second groove 52, and the height of this wall (from the first groove 51) By setting the height)
higher than the thickness (for example, 1 mm) of the permanent magnet 20, a slight gap (for
example, 0.5 mm) is formed without the permanent magnet 20 and the diaphragm 10 coming in
contact with each other. 10 becomes easy to vibrate. Thereby, the buffer film 30 (FIG. 3) can be
omitted. The thickness of the permanent magnet 20 and the size of the distance between the
permanent magnet 20 and the diaphragm 10 are not limited to the illustrated ones.
[0036]
<Slit> FIG. 9 is a view showing an example of change in sound pressure with respect to the slit
length. FIG. 9 (a) shows a slit width of 1 mm, FIG. 9 (b) shows a slit width 2 mm, FIG. 9 (c) shows
a slit In the case of 3 mm in width. The curve plotted with black circles is the signal frequency of
10 kHz, the curve plotted with black triangles is the signal frequency of 17 kHz, and the curve
plotted with open squares is the signal frequency of 19 kHz.
[0037]
The half wave of the sound wave at 10 kHz is about 17 mm, the half wave at 17 kHz is about 10
mm, and the half wave at 19 kHz is about 9 mm, as understood from FIG. The sound pressure is
high from 2 to 1/4.
[0038]
In the field of radio waves, slit antennas are known.
The slot antenna shown in FIG. 10 (a) is equivalent to the magnetic current dipole shown in FIG.
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10 (b), and has a complementary pair with the plate-like dipole shown in FIG. 10 (c). A half-wave
antenna (half-wave dipole) has a distribution of voltage and current shown in FIG. 11 (a), and a
distribution of electric lines of force shown in FIG. 11 (b). Has a distribution of In the case of the
slit antenna, when the length of the slit is a half wavelength, the resonance is maximized by the
resonance.
[0039]
As described with reference to FIG. 9, the peak of the sound pressure near the half wavelength of
the sound wave may be due to the same principle as the slit antenna described above, but other
factors may be considered. That is, since the sound pressure is lowered by the interference of the
sound waves of antiphase from below the hole of the slit, the sound pressure of antiphase is also
low when the slit width and slit spacing are around a half wavelength. is expected. In this
experiment, it was confirmed that the peak of the sound pressure was not between the half
wavelength but the sound pressure peak between the half wavelength and the quarter
wavelength. From this, not only the principle of a simple slit antenna but also the interference of
sound waves through the slit is considered to be a factor, and the interference from the sound
wave of the antiphase is minimized, 1/1 of the used frequency It is preferable to set in the range
of 2 wavelengths to 1⁄4 wavelength. The same applies to the slit spacing in the case of providing
a plurality of slits. The shape of the slit is preferably a square in order to make the width to be
vibrated uniform.
[0040]
<Size of diaphragm> Even with the same diaphragm, the vibration, that is, the sound pressure
increases as the width is increased. FIG. 12 is a diagram showing an example of the sound
pressure change with respect to the frequency due to the width change of the diaphragm, and
the curve plotted with black circles is the sound pressure change with respect to the signal
frequency of the diaphragm without slit as a standard (STD). The plotted curve represents the
change in sound pressure relative to the signal frequency of the diaphragm with a width 1.3
times the standard, and the curve plotted with black squares has a width 1.3 times the standard,
and a slit (for example, slit length: Change in sound pressure with respect to signal frequency of
diaphragm provided with 8 mm, width: 2 mm), curve plotted with open squares shows change in
sound pressure with respect to signal frequency of diaphragm with width 1.6 times larger than
the standard There is. When the width of the diaphragm is 1.3 times, the area of the magnetic
field applied to the current flowing in the coil is 1.3 times, so the sound pressure is also about
1.3 times that of "Fleming force = current * magnetic field" (Equivalent to 3 dB). When the width
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of the diaphragm is 1.6 times, the sound pressure is about 1.6 times.
[0041]
It is true that the vibration and the sound pressure are increased by enlarging the diaphragm, but
it is inefficient to expand only the area of the diaphragm to raise the vibration and the sound
pressure, which is inconvenient in relation to the installation place There is a case. For example,
considering an example where sound is produced by winding it around a straight tube
fluorescent lamp or LED illumination, increasing the area of the diaphragm results in an increase
in the area that hides the light emitting part, which reduces the brightness. Problems occur.
Therefore, it is desirable that the sound pressure be as high as possible by reducing the vibration
area as much as possible. In the example of FIG. 12, when it is desired to improve the sound
pressure, the standard sound pressure can be improved by 5 dB to 6 dB by making the width and
area 1.3 times the standard (STD) and inserting a slit. Considered advantageous.
[0042]
<Example> The speaker structure using the bobbin type structure shown in FIGS. 6 to 8 is an
example in which the size of the diaphragm (FPC: Flexible Printed Circuits) and the position /
number / size of the slits are variously changed. 1 to 20 are shown in FIGS. In each example,
measurement results of sound pressure at representative frequencies are shown together.
[0043]
Examples 1 to 7 in FIG. 13 are cases where the arrangement and the number of slits are largely
changed. Examples 8 to 17 in FIG. 14 are cases in which the slit size is changed in detail.
Examples 18 to 20 in FIG. 15 are examples set for comparison after comprehensively judging the
results of Examples 1 to 17.
[0044]
In Examples 1 to 20, a polyimide resin film (film thickness of 20 μm) in which coils (copper
pattern of 9 μm in thickness and 3 mm in pitch) were formed on both surfaces was used as a
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diaphragm. Further, as a permanent magnet, a bonding Nd magnet (leakage magnetic field: ±
100 gauss, thickness 1 mm, pitch of band magnet: 3 mm) was externally attached to the
mounting groove area.
[0045]
Examples 18 to 20 shown in FIG. 15 have the following specifications. That is, the length of the
diaphragm was 118 mm and the width was 36 mm. Since the frequency to be used is 17 KHz to
19 KHz, the slit length adopted 8 mm which is equal to or less than a half wavelength at which
the sound pressure can be improved. In the case of the presence of the slits, the slit widths
adopted 1 mm and 2 mm, and the slits were arranged at equal intervals as a total of eight slits on
each side of the coil in the longitudinal direction.
[0046]
FIG. 16 is a diagram showing an example of the change in sound pressure with respect to
frequency due to slit width change of the diaphragm, and the curve plotted by black circles is a
practice without slits 18 and the curve plotted by black triangles is an example 19 with a slit
width of 1 mm The curves plotted with black squares correspond to Example 20 with a slit width
of 2 mm. From this result, Example 20 is preferable.
[0047]
<Evaluation of directivity characteristics> Sounds respectively outputted from the speaker
(speaker structure) of Example 20 and a speaker without a slit as a comparative example were
measured to verify the directivity characteristics. In this experiment, the distance from the
speaker to the microphone (Accord Inc., Type 4152: nondirectional) is 50 cm, and as shown in
FIG. 17A, four measurement positions (a speaker with respect to a reference line passing through
the center of the speaker) Relative angle of circumferential direction: 0 °, 30 °, 60 °, 90 °),
and four measurement positions shown in FIG. 17 (b) (relative angle of the longitudinal direction
of the speaker with respect to the reference line passing through the center of the speaker: The
sound output from the speaker was measured at 0 °, 30 °, 45 °, 60 °).
[0048]
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In this measurement, free software (WaveGene: ver 1.4) that outputs sound of a single frequency
is used as a sound source, and sound pressure measurement software for two types of sound (10
KHz and 20 KHz) output from a speaker It measured by (Spectra made by Accor Inc.).
[0049]
18 (a) shows an example of the measurement result according to FIG. 17 (a), and FIG. 18 (b)
shows an example of the measurement result according to FIG. 17 (b).
[0050]
From these measurement results, in the comparative example, the measured sound pressure (dB)
decreases as the relative angle to the reference line perpendicular to the diaphragm increases,
and the directivity is recognized, while the directivity is recognized. It was found that the
measured sound pressure (dB) did not change significantly even if the relative angle increased.
Therefore, it turned out that the speaker of a present Example has omnidirectionality.
[0051]
<Application of Straight Tube Fluorescent Lamp to Socket Unit> When considering adding a
conventional cone-type speaker to the straight tube fluorescent lamp socket unit, a speaker
(diaphragm) with a small size is adopted due to space. In that case, the spread of the sound can
not be expected.
[0052]
In this respect, the speaker structure of this embodiment can be attached using the cylindrical
curved surface of the socket portion of the straight tube fluorescent lamp, and in this case, the
acoustic wave generated by the diaphragm having the arc curved surface Propagates in a wide
range (normal direction of the curved surface of the diaphragm).
[0053]
In addition, the aspect using the socket part of the straight tube | pipe fluorescent lamp
mentioned above is an illustration to the last, and if it is a structure which has a curved surface,
using any thing as an area | region for attaching the speaker structure of this embodiment Can.
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[0054]
Also, in the above-described embodiment, only the speaker structure is additionally attached to
the area having the curved surface of the existing structure, but a dedicated structure is prepared
to construct the speaker structure. It goes without saying that it is acceptable.
[0055]
<An example in which the slits are arranged in the longitudinal direction and in the direction
perpendicular thereto> In the example shown in FIG. 7 etc., plural slits are arranged along the
end of the diaphragm in the longitudinal direction. It is also possible to arrange a plurality in the
direction perpendicular to the direction.
[0056]
FIG. 19 shows an example in which the slits are arranged in the longitudinal direction and in the
direction perpendicular thereto, and FIG. 19 (a) shows only the diaphragm, and FIG. 19 (b) forms
the magnet and diaphragm on the base. Shows the speaker structure.
The base was manufactured by a 3D printer, and an ABS resin (a generic name of copolymer
synthetic resins of acrylonitrile (Acrylonitrile), butadiene (Butadiene), and styrene (Styrene)) was
used as a material.
The magnet used the bond system magnet like the other Examples, and made the strong side of
the magnetic field the coil side.
[0057]
FIG. 20 is a diagram showing an example of measurement results of sound pressure
characteristics. When a black square curve has a slit in the lateral direction (horizontal slit), a
curve of the black triangle has a lateral slit (horizontal slit for comparison) It shows the case
where there is no).
As the measurement system, the sound pressure was measured by the same method as described
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in FIG.
[0058]
In FIG. 20, it can be seen that the sound pressure is improved in the frequency range of 17 KHz
to 20 KHz to be used as compared with the case without the horizontal slit.
[0059]
<Example of increased heat resistance> Since the diaphragm (FPC) is mainly composed of
polyimide material, it satisfies the flame retardant standard UL94V-0, but the magnet is mainly
composed of rubber etc., so it becomes high temperature In addition to melting at the same time,
there is a problem that the magnetic force drops due to the temperature characteristic (the
characteristic weak to heat) of the magnet.
[0060]
Therefore, a flexible and flame-retardant sheet was formed between the FPC and the magnet of
the diaphragm, in which metal or glass was woven in a fibrous form.
[0061]
FIG. 21 is a view showing an example of the cross section of the diaphragm, the sheet, the rubber
magnet, and the base. A sheet in which metal or glass is woven is disposed between the
diaphragm (FPC) and the rubber magnet.
[0062]
In the case of metal, although a simple stainless steel mesh may be used, it is desirable to use a
conductive cloth and a conductive non-woven fabric because there is a problem in flexibility.
[0063]
FIG. 22 is a view showing a state in which heat is applied to the sheet and the rubber magnet,
and shows a case in which a sheet in which a metal is woven is formed.
FIG. 22 (a) shows the state before applying heat, and FIG. 22 (b) shows the state after applying
heat at the tip of the soldering iron.
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When the sheet is not formed, the rubber magnet melts, but when metal is woven, it does not
burn as shown in FIG. 22 (b), and the rubber component of the rubber magnet only bites into the
metal mesh, The effect of not melting out was confirmed.
[0064]
The sheet used to weave the metal used this time into a fiber is the flame retardant type
(conforming to UL 94-0 standard) Cu / Ni woven sheet Sui-50-KL95 (Seiren Co., Ltd.), but is
limited to this It is not something to be done.
When using glass, glass cloth etc. are mentioned.
When using Teflon (registered trademark) impregnated glass cloth sheet fabric (0.1 mm thick
FGF-500-4-1000W, made by Chukosei Chemical Co., Ltd.), the solder iron may be because its
heat resistance is higher than when it is woven with metal. There was almost no change even if
the heat was applied at the end of the
[0065]
The conductive cloth / conductive non-woven cloth is conductive, but the surface of the vibrating
plate (FPC) is processed using white heat resistant solder resist ink (solar ink) to form an
insulating layer containing titanium oxide. It was formed on both sides of FPC in 30 um thickness
by printing (manual printing table-top type screen printing machine NJ-15PHP, version is 120
um mesh of Tokyo process service).
By using this insulating layer, the insulating property between the conductive cloth and the
conductive non-woven fabric is maintained, and as described below, it has flame retardancy and
also has thermal conductivity. With the conductive cloth and the conductive non-woven fabric,
the thermal characteristics of the magnet are obtained. It also has the effect of making it difficult
to change.
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Coating performance item: Insulation resistance Test method: AC impedance method Test result:
2 × 10 <9> MΩ item: Flame retardancy Test method: UL standard Test result: V-0 equivalent
item: thermal conductivity Test method: Laser flash Method Test result: 1.0W / mK
[0066]
The magnetic force was measured by placing the sheet on the rubber magnet surface and the
rubber magnet (apparatus: Gauss Meter (manufactured by Toyo Magnetic Industries, TGM-400)),
but the magnetic force is 200 mT for the S pole and the N pole, It had almost the same
characteristics.
[0067]
The frequency characteristics of the speaker structure when the ambient temperature is 40
degrees are shown in FIG. 23. However, even when there is a seat, the sound pressure at 17 KHz20 KHz used is good.
[0068]
<Summary> As described above, according to the present embodiment, it is possible to provide
an energy conversion device that can be easily attached to various structures and can improve
the energy conversion efficiency.
[0069]
The present invention has been described above by the preferred embodiments of the present
invention.
While the invention has been described with reference to particular embodiments, it is to be
understood that various modifications and changes may be made to these embodiments without
departing from the broad spirit and scope of the invention as defined in the appended claims. It
is clear that
That is, the present invention should not be construed as being limited by the details of the
specific examples and the attached drawings.
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[0070]
100 Speaker structure 10 diaphragm 12 flexible substrate 14 coil 14a plus terminal 14b minus
terminal 15 fixing member 16 slit 17 locking hole 20 permanent magnet 30 buffer film 40 high
permeability sheet 50 structure 51 first groove 52 first groove 2 groove 53 locking part
[0071]
Patent No. 5262599 gazette
11-05-2019
19
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