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JP2006080938

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2006080938
PROBLEM TO BE SOLVED: To provide an electric-sound converter such as a speaker which can
be made thinner and / or miniaturized and which can be easily manufactured as compared with a
conventional speaker in which a drive coil is wound by a winding machine. A speaker 2 includes
a thin film coil 8 formed on a diaphragm 9 by a vapor deposition method, a magnet 12 opposed
to the thin film coil 8, and the diaphragm 9. A thin film coil 8 deposited on a coil pattern using a
vapor deposition mask 27 is provided on the diaphragm 9 so as to face the magnet 12 on the
side of the frame 1 with a gap, and in particular, the winding end point 21 of the thin film coil 8
vibrates. It is taken out by the conductive layer 25A through the resist 24 on the plate 9.
[Selected figure] Figure 1
Electric-voice converter
[0001]
The present invention relates to an electric-to-speech converter such as a speaker, and more
particularly to an electric-to-speech converter suitable as a speaker of a portable telephone or a
thin television receiver using liquid crystal or plasma.
[0002]
Conventionally, as a speaker, a drive coil (generally called a voice coil) using an electrodynamic
transducer.
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An electrokinetic speaker is known which consists of a conical diaphragm and a conical
diaphragm for acoustic radiation.
[0003]
Such an electrodynamic speaker withstands large amplitude in the low frequency, has good
sensitivity frequency characteristics, has an electrical impedance close to pure resistance,
advances in diaphragm manufacturing technology, and development of magnet steel produces
large magnetic energy Are widely used, for example, because
[0004]
In the structure of this electrodynamic speaker, generally, a cylindrical magnetic field is formed
by a central magnetic pole having a permanent magnet and a yoke, and a drive coil (winding is
wound on a cylindrical portion at a cone center position inserted between the central magnetic
pole and the yoke). ) Is wound.
[0005]
Then, the magnetic field generated from the drive coil magnetically interacts with the magnetic
field generated by the central magnetic pole according to the signal current, and the cone
diaphragm having the drive coil is vibrated by attraction or repulsion by magnetic force. Audio
can be played back.
[0006]
In addition, there is also a speaker having a structure in which a cylindrical protrusion is
provided at the center position of the flat diaphragm and the drive coil is wound around the
protrusion.
[0007]
However, in the above-described conventional example, since it is necessary to wind the drive
coil around the cylindrical portion provided at the center position of the diaphragm of the
speaker, the speaker itself becomes bulky by the drive coil, and a dedicated winding machine The
cost of producing the speaker can not be reduced so much.
[0008]
The present invention has been made in view of the above circumstances, and an object thereof
is to provide an electric-voice converter such as a speaker which can be thinned and / or
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miniaturized and which is easy to manufacture. is there.
[0009]
That is, the present invention is characterized in that in the electro-acoustic transducer
comprising a coil, a magnet opposed to the coil, and a vibrating body, the vibrating body is
provided with a thin film coil as the coil. , And an electric-to-speech converter.
[0010]
According to the present invention, since the thin film coil as the coil is provided on the vibrating
body itself, the coil portion can be thinner than the structure in which the coil is wound around
the cylindrical portion of the vibrating body. As well as being able to reduce the size and making
the electric-speech converter thinner and / or smaller and to form the thin film coil by vapor
deposition using a vapor deposition mask, a dedicated winding machine Also, the cylindrical
portion for securing the winding is not required, and the production of the electro-acoustic
transducer can be relatively easily performed.
[0011]
In the present invention, the diaphragm as the vibrator is disposed opposite to the permanent
magnet as the magnet with a gap, the thin film coil is provided on the permanent magnet side of
the diaphragm, and the thin film coil is particularly preferable. It is desirable to form by vapor
deposition.
[0012]
Next, preferred embodiments of the present invention will be specifically described with
reference to the drawings.
[0013]
First Embodiment FIGS. 1 to 5 show a first embodiment of the present invention.
[0014]
The speaker 2 according to the present embodiment is suitable for use in a mobile phone, and
has a substantially circular frame 1 as shown in FIGS. 1 and 2 and a cylindrical portion is formed
in the recess 14 in the central portion of the frame 1. A thin magnet (permanent magnet) 12 of
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the shape shown is fitted and fixed, and a disc-shaped diaphragm 9 made of, for example,
polyimide is disposed opposite to the magnet 12 with a gap.
A thin film (drive) coil 8 is provided on the diaphragm 9 at an inner position of the ring-shaped
protrusion 10 (diaphragm edge) in the peripheral portion in a state of facing the magnet 12.
Further, the coil terminal portion of the diaphragm 9 is sandwiched between the cover 3 having
the hole 4 for deriving the reproduced sound and the conductive rubber contact 11.
[0015]
The peripheral portion of the cover 3 is inserted into the recess 15 of the frame 1 and the
terminal housing hole 13 of the frame 1 together with the conductive rubber contact (for
example, conductive rubber) 11 receives an impact generated by the vibration of the diaphragm
9. A conductive coil spring 6 (for example, a gold-plated coil) which is insert-molded to the
conductive rubber contact 11 for absorption is mounted as an external terminal 39.
Therefore, when the speaker 2 is mounted on a mounting substrate (not shown: the same applies
hereinafter), the coil 8 and the mounting substrate are connected via the terminal 39 formed of
the conductive coil spring 6 and the conductive rubber contact 11. Electrically connected.
At the bottom of the frame 1, a protrusion 7 is integrally provided as a guide pin for mounting
the speaker on the mounting substrate.
[0016]
Here, it should be noted that the drive coil 8 is formed in a thin film coil pattern on the magnet
12 side by a vapor deposition method or the like in the diaphragm 9 oppositely disposed with a
gap to the magnet 12.
[0017]
That is, since the coil 8 is provided as a thin film on the diaphragm 9 itself, the speaker 2 can be
thinned and miniaturized.
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[0018]
Further, as described later, since the thin film coil 8 can be formed into a thin film pattern by
vapor deposition using a vapor deposition mask, the coil 8 can be accurately formed to a desired
pattern and film thickness without using a special winding machine or the like. It can be formed
well and easily.
[0019]
In addition, since the diaphragm 9 provided with the thin film coil 8 is sandwiched between the
cover 3 and the contact 11, if the cover 3 is removed when replacing the coil 8 due to
deterioration or the like of the coil 8, a normal coil can be obtained. The diaphragm 9 with 8 can
be easily mounted, and replacement of the coil 8 can be easily performed.
The central portion of the diaphragm 9 is provided with an air passage hole 17 for uniforming
the internal pressure and smoothly performing the vibration, but this need not necessarily be
provided.
[0020]
The dimensions of each component of the speaker 2 are, for example, 5 mm in outer diameter of
the frame 1, 2.2 mm in thickness (height), 4 mm in outer diameter of the diaphragm 9, and 2
outer diameters of the magnet 12 The distance between the diaphragm 9 and the magnet 12
may be 0.6 mm.
The thin film coil 8 will be described later.
[0021]
Next, the steps of manufacturing the diaphragm 9 will be described with reference to FIGS. 3 to 4
(however, the cross-sectional view of the diaphragm 9 including the coil 8 is somewhat
exaggerated in more detail than that shown in the plan view of the same figure). Are shown
below: the same applies.
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[0022]
First, as shown in FIG. 3 (a), a ring-shaped projection 10 (diaphragm edge portion) having a
substantially semicircular cross section for performing the vibration smoothly on the peripheral
portion of the disk-shaped diaphragm (substrate) 9 And press processing).
Further, two notches 18 serving as positioning guides when the diaphragm 9 is disposed on the
frame 1 are provided on the outer periphery of the diaphragm 9 at two places.
[0023]
Next, as shown in FIG. 3B, the thin film coil 8 is formed in a predetermined winding pattern on
the diaphragm 9 on the side opposite to the projection 10 by the vapor deposition method.
At this time, the coil winding start point 19 is formed in the vicinity of the outer periphery of the
diaphragm 9 and the coil winding end point 21 is formed in the vicinity of the center of the
diaphragm 9 as a coil terminal.
[0024]
In this case, for example, the outer diameter of the diaphragm 9 may be 4 mmφ, the coil line
width may be 30 μm, the gap between coil wires may be 20 μm, the coil 8 may be formed in 14
turns, and the coil 8 may be 20 μm thick copper It may be formed of a layer.
[0025]
As a method of manufacturing the coil 8, as shown in FIG. 5, a vapor deposition mask 27 having
openings 26 of a pattern corresponding to the coil 8 is disposed in advance under the diaphragm
9, and By depositing, for example, copper) on the diaphragm 9, the coil 8 having a thickness of,
for example, 20 μm (or 10 μm) can be formed in a thin film pattern.
[0026]
Next, as shown in FIG. 3C, the electrically insulating resist 24 is placed on the diaphragm 9 so as
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to have an opening 22 near the center of the diaphragm 9 and an opening 23 near the outer
periphery of the diaphragm 9. To form.
Here, the opening 22 is formed such that the coil winding end point 21 is exposed, and the
opening 23 is formed such that the coil winding start point 19 is exposed.
Such a pattern of the resist 24 is formed by printing of a resist material, but can also be formed
by exposure and development after application of the resist.
[0027]
Next, as shown in FIG. 4 (d), for example, Ag / Pd is printed on the resist 24 from the resist
opening 22 to the outer periphery of the diaphragm 9, and then baked to bake the coil winding
end point 21 to the outside. A conductive layer 25A for taking out is formed, and a conductive
layer 25B for taking out the coil winding start point 19 is formed on the resist 24 over the resist
24 to complete the fabrication of the diaphragm 9.
Incidentally, the diaphragm 9 with the coil 8 is collectively performed on the diaphragm
(substrate) of a large area at the beginning of the process up to the deposition of the abovedescribed coil, and thereafter cut individually into the diaphragm shape. The steps described
above can be performed.
Alternatively, the cutting may be performed after the process of FIG. 3 (c) or FIG. 4 (d).
[0028]
Second Embodiment FIG. 6 shows a second embodiment of the present invention.
[0029]
In the present embodiment, although the protrusion 10 (diaphragm edge portion) is not formed
in the above-described diaphragm, a width extending outward in the radial direction from the
diaphragm 9 made of, for example, polyimide slightly larger in diameter than the coil region
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Narrow extension parts 9a are provided, for example, symmetrically at four places.
These extended portions impart vibration characteristics equivalent to those of the diaphragm
edge portion.
The first thin film coil 8a similar to that described above is formed on one surface of the
diaphragm 9, and the second thin film coil 8b similar to that described above is formed on the
other surface of the diaphragm 9, The thin film coils 8a and 8b are connected to each other
(through unillustrated through hole plating) through the through holes 50 penetrating at the
winding end points 21a and 21b.
[0030]
Accordingly, from the coil winding end point 19a of the first thin film coil 8a to the coil winding
start point 19b of the second thin film coil 8b, the thin film coils 8a and 8b are connected in
series, and the number of turns is doubled as a whole. There is.
However, in this series connection, it is necessary to determine the coil winding direction so that
current flows in the same direction in plan view of each thin film coil.
[0031]
Through holes 51 are formed at the respective starting points 19a and 19b of thin film coils 8a
and 8b at positions B and C in the figure, and external terminals are connected thereto by
through hole plating and solder (not shown). The terminal portions 28a and 28b to be formed
are formed, and the conductor patterns 28b 'and 28a' of the same shape are also formed on the
surface on the opposite side to stably connect with the outside.
Conductor patterns 28a ′ ′ and 28b ′ ′ similar to the terminal portions are also provided at
positions A and D in the drawing, but this is necessary for overall strength balance, but it is not
necessary to be necessarily provided.
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[0032]
As described above, according to the present embodiment, since the thin film coils 8a and 8b are
formed on the front and back surfaces of the diaphragm 9, respectively, the same function and
effect as described in the first embodiment can be obtained. In addition, since the thin film coils
8a and 8b are connected in series, the number of turns can be doubled as a whole, and the
electromagnetic conversion characteristics can be improved.
In addition, the diaphragm 9 can be further miniaturized, the flatness can be maintained by the
presence of the extended portion 9a, and the diaphragm can be stably fixed to the frame at four
places in the periphery (however, The number is not limited to four, and may be, for example,
two places with each terminal portion).
Further, in the terminal lead-out structure of each thin film coil 8a, 8b, the interlayer insulating
film such as the resist described above becomes unnecessary, so that the terminal can be easily
taken out through through hole 50, and the thickness of the coil region is further increased. It
can be thin and flat.
[0033]
Third Embodiment FIGS. 7 to 8 show a second embodiment of the present invention.
[0034]
The speaker 29 according to the present embodiment has, for example, a square frame 34 with
an outer diameter of 60 cm on the back side as a so-called woofer speaker suitable for a liquid
crystal or plasma type thin television receiver, for example A magnet (permanent magnet) 31
having an outer diameter of 15 cm and an inner diameter of 11 cm is accommodated in a ringshaped recess 38 formed around the hole 28.
Then, a large number of small spaces are formed on the back side of the speaker by the support
plate 30 consisting of concentric plate portions 30b connected by the ribs 30a extending radially
from the hole portion 28, thereby improving the reproduction characteristics by the vibration
sound .
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[0035]
A vibrating film 33 is disposed opposite to the magnet 31 of the frame 34 with a gap, and a thin
film coil 35 is provided on the vibrating film 33 so as to face the magnet 31. The thin film coil 35
is formed in the same manner as the thin film coil 8 described above, but the vibrating film 33
having the coil 35 is adhered to the inner surface of the relatively hard annular diaphragm 32. .
[0036]
With regard to the material and dimensions, for example, the diaphragm 32 may be made of
polyvinyl chloride (PVC) and have a thickness of 0.2 mm, and the diaphragm 33 may be made of
polyimide and have a thickness of 50 μm and an outer diameter of 30 cm. These may be
integrated by adhesion.
[0037]
In particular, FIG. 8D is an enlarged view of a portion A in FIG. 7B, but the thin film coil 35
provided on the vibrating film 33 has a coil winding start point 19 and a coil winding end point
21. Then, except for the coil winding end point 21 and the lead terminal 41 of the lead 36b on
the lead portion 40 (in the same manner as the openings 22 and 23 described above), it is
covered with an electrically insulating resist 24.
[0038]
The coil winding end point 21 and the conductor terminal 41 not covered with the resist 24 are
electrically connected by the wiring portion 37 such as Ag / Pd described above, and the coil
winding end point 21 is derived to the outside.
On the other hand, the coil winding starting point 19 and the conducting wire 36a on the
conducting wire portion 40 are integrally formed, and the coil winding starting point 19 is led to
the outside.
The conducting wires 36a and 36b are connected to the external circuit of the mounting
substrate via the diaphragm 32 and the frame 34, but this connecting structure is not shown.
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[0039]
The coil line width of the thin film coil 35 may be 50 μm, the gap between the coil wires may be
40 μm, and winding may be performed for 220 turns. The outer diameter of the coil region may
be 150 mmφ and the inner diameter may be 110 mmφ. Further, the distance between the
vibrating film 33 and the magnet 31 may be 8 mm. In addition, a cover as described above may
be attached to the front surface of the diaphragm 33 and the diaphragm 32.
[0040]
Also in this embodiment, since the thin film coil 35 formed by the vapor deposition method or
the like is provided in the vibrating film 33, the same operation and effect as obtained by the first
embodiment described above can be obtained.
[0041]
The embodiments described above can be variously modified based on the technical idea of the
present invention.
[0042]
For example, the thin film coil described above may be formed by patterning a deposited film
formed over the entire area of the vibrating plate by a photoetching method, instead of using the
deposition mask.
In addition to the vapor deposition method, physical film deposition methods such as sputtering,
screen printing, stamping methods for transferring a coil pattern, and the like can also be used.
[0043]
The conductive layer (wiring portion) for taking out the coil winding end point is made to cross
over with the coil via the resist on the diaphragm, but the resist can be provided only in this
crossover region.
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In addition, a through hole can be provided in the diaphragm, and the coil winding end point can
be taken out to the surface on the opposite side of the diaphragm through this through hole.
[0044]
In addition, in the state of facing the above-described magnet, a thin film coil may be provided on
the diaphragm surface on the side where the diaphragm edge portion (damper) is provided.
Although the above-mentioned resist also has the function of protecting the thin film coil, an
effective protective film may be coated separately. In addition, the structure, shape, material, and
the like of each part of the above-described speaker may be variously changed.
[0045]
The present invention can be applied not only to the above-described speaker but also to other
electric-sound conversion devices, such as a microphone. In this case, the diaphragm can be
vibrated by an external sound by an operation reverse to that of the speaker, and the current
flowing through the coil can be modulated and converted into an electric signal.
[0046]
The present invention can provide, for example, an electric-speech converter such as a thin and /
or small speaker suitable for use in an audio device such as a mobile phone or a thin television
receiver.
[0047]
They are a front view (A), a side view (B), an A-A 'line sectional view (C), and a rear view (D) of a
speaker according to a first embodiment of the present invention.
It is a front view (A) and the A-A 'line sectional view (B) of the frame of a speaker equally. It is the
front view and A-A 'line sectional view which show the preparation processes (a)-(c) of the
diaphragm of a speaker equally in the same. It is the front view and the A-A 'line cross section
which show the preparation processes (d) of the diaphragm of a speaker equally. It is an
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expanded sectional view for demonstrating the manufacturing process (b) of the diaphragm of a
speaker in detail in the same. They are a top view (A), a X-X 'line sectional view (B), and a back
view (C) of a speaker by a 2nd embodiment of the present invention. It is a rear view (A) and a
front view (B) of the speaker by a 3rd embodiment of the present invention. It is an A-A 'line
sectional view (C) and the A section enlarged view (D) similarly.
Explanation of sign
[0048]
DESCRIPTION OF SYMBOLS 1, 34 ... Frame 2, 2, 29 ... Speaker, 3 ... Cover, 6 ... Conductive coil
spring 8, 8a, 8b, 35 ... Thin film coil, 9, 32 ... Diaphragm, 9a ... Extension part, 11 ... Conductivity
Rubber contacts 12, 31, ... Magnets 19, 19, 19a, 19b ... Coil winding start points 21, 21, 21a, 21b
... Coil winding end points, 24 ... Resists, 25 ... Conductive layers, 27 ... Deposition masks, 28a,
28b ... Terminal portions, DESCRIPTION OF SYMBOLS 30 ... Support plate, 30a ... Rib, 30b ... Plate
part, 33 ... Vibrating film, 36a, 36b ... Conducted wire, 37 ... Wiring part, 39 ... Terminal, 40 ...
Conducted wire part, 41 ... Conducted wire terminal, 50, 51 ... Through hole
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