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JP2004260347

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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
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DESCRIPTION JP2004260347
The present invention provides an electro-acoustic transducer capable of reducing the number of
parts and the number of assembly steps by directly winding a coil on a diaphragm. A vibration
generating drive source 3 of an electric signal conversion device 1 according to a first
embodiment of the present invention comprises a coil 4 wound directly on a diaphragm 2 along
an outer peripheral end face 2a of the diaphragm 2; A cushion member 5 having elasticity to
support the outer peripheral end face 2a of the plate 2 and a magnet 6 disposed on the side
facing the coil 4 via the cushion member 5 on the side facing the diaphragm 2 The base 7 is
disposed with the cushion member 5 and the magnet 6 interposed therebetween, and when the
vibration generating drive source 3 is driven, the diaphragm 2 vibrates in the arrow B direction
orthogonal to the surface of the diaphragm 2 via the cushion member 5. It is supposed to
[Selected figure] Figure 1
Electro-acoustic transducer
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer, and more particularly to a thin electroacoustic transducer using a flat
diaphragm and an electronic device using the same. [0002] Conventionally, a thin electroacoustic transducer has been adopted as a speaker or a microphone used for various electronic
devices such as a laptop personal computer, a thin television, a portable telephone, etc. . [0003]
As shown in FIG. 4, such a conventional electroacoustic transducer has a flat diaphragm 51, and
on the back surface of this diaphragm 51, vibration generation capable of vibrating and driving
the diaphragm 51 is generated. A drive source 52 is provided. A magnet 53 of the vibration
generating drive source 52 is fixed to a base 55 via a first yoke 54. Further, in the first yoke 54, a
pair of arm portions 54b and 54b are formed to extend from the both end portions of the base
54a toward the diaphragm 51 with a predetermined length. The base 54a is fixed to the base 55,
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and the magnet 53 is fixed on the base 54a in a portion sandwiched between the pair of arms
54b and 54b. A second yoke 56 is fixed to the magnet 53 on the side facing the back surface of
the diaphragm 51, and a gap of a predetermined size is formed between the second yoke 56 and
the back surface of the diaphragm 51. . Further, on the back surface of the diaphragm 51, a coil
57 wound around a substantially rectangular shape and hollow inside (not shown) is fixed by an
adhesive or the like, and the outer peripheral end of the diaphragm 51 is a cushion member The
lower end of the cushion member 58 is attached to the base 55. When the conventional
electroacoustic transducer as described above is a speaker, when the coil 57 is supplied with an
alternating current using a sound signal as an electric signal, the coil 57 vibrates in the vertical
direction according to the law of framing. The vibration of the coil 57 causes the diaphragm 51
to vibrate in the direction of arrow A in the direction orthogonal to the surface of the diaphragm
51. A sound of a predetermined magnitude can be output by the vibration of the diaphragm 51.
However, in the conventional electric signal conversion device, since the coil 57 is separate from
the diaphragm 51, the coil 57 separate from the diaphragm 51 is vibrated at the time of
assembly. Since it had to be fixed to the back surface of the plate 51 with an adhesive or the like,
there was a problem that the number of assembling steps increased and the cost increased. The
present invention has been made in view of the problems as described above, and it is an object
of the present invention to provide an electroacoustic transducer capable of reducing the number
of parts and the number of assembling steps by directly winding a coil on a diaphragm. Do.
SUMMARY OF THE INVENTION As a first means for solving the above-mentioned problems, an
electric signal conversion device according to the present invention comprises: a flat diaphragm;
and vibration capable of driving the diaphragm. The vibration generating drive source includes: a
coil wound directly on the diaphragm along the outer peripheral end face of the diaphragm; and
a cushion member having elasticity to support the outer peripheral end face of the diaphragm
near the outer peripheral end face And a magnet disposed on the side facing the coil via the
cushion member, and on the side facing the diaphragm, a base is disposed sandwiching the
cushion member and the magnet, When the vibration generating drive source is driven, the
diaphragm vibrates in a direction orthogonal to the surface of the diaphragm via the cushion
member. Further, as a second solution means for solving the above-mentioned problems, the
base is located on the side facing the diaphragm and the bottom wall to which the magnet is
fixed, the diaphragm and the vibration. And a side wall surrounding the generation driving
source, wherein the diaphragm is characterized in that a gap is formed between the coil and the
side wall. Further, as a third solution for solving the above-mentioned problems, a flat diaphragm
and a vibration generating drive source capable of vibrating and driving this diaphragm are
provided, and the diaphragm is close to one end. The vibration generating drive source is
disposed on the back side of the support, and at least the one end and the two sides orthogonal
to the one end opposed to each other are supported by the elastic cushion member, The back
surface includes at least a pair of bobbins erected with a predetermined interval along the one
end portion, and the vibration generating drive source is a coil wound so as to bridge between
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the at least a pair of bobbins and And a magnet disposed on an inner peripheral portion of the
coil between the pair of bobbins, and driving the vibration generating drive source, the
diaphragm is perpendicular to the surface of the diaphragm via the cushion member. Vibrate to
It is characterized by having done so. Further, as a fourth means for solving the above-mentioned
problems, the diaphragm is characterized in that the other end side facing the one end portion is
supported by a rigid body. Further, as a fifth solution to solve the above-mentioned problems, a
plurality of the magnets are disposed on the inner peripheral portion of the coil. BEST MODE
FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of an electric signal
conversion apparatus according to the present invention will be described based on FIGS. 1 to 3.
FIG. 1 is a view for explaining a first embodiment according to the present invention, FIG. 2 is a
plan view for explaining a second embodiment according to the present invention, and FIG. 3 is
an enlarged sectional view of an essential part of FIG. It is. First, as shown in FIG. 1, the
electroacoustic transducer 1 according to the first embodiment of the present invention is made
of a transparent acrylic plate or the like and provided with a diaphragm 2 of a predetermined
thickness. A vibration generating drive source 3 capable of vibrating and driving the diaphragm
2 is disposed near the outer peripheral end face 2 a of the plate 2. In the vibration generating
drive source 3, the coil 3 is directly wound around the diaphragm 2 along the outer peripheral
end face 2 a of the diaphragm 2. Further, on the back surface of the diaphragm 2 at the portion
where the coil 3 is wound, the outer peripheral end face 2a and the vicinity thereof are
supported by the cushion member 5 made of polyurethane foam or the like and having elasticity.
Further, the cushion member 5 is fixed to and supported by the magnet 6 whose lower end
portion is a permanent magnet, and the magnet 6 is mounted on the bottom wall 7a of the base 7
made of a magnetic material such as an iron plate. It is fixed by In the base 7, an opening 7 b is
formed in the bottom wall 7 a and a side wall 7 c surrounding the diaphragm 2 and the vibration
generating drive source 3 is formed on the outer peripheral portion. The magnet 6 is placed on
the bottom wall 7a in a state where one magnetic pole side is in close contact with the side plate
7c. Further, in the bottom wall 7a of a portion where the magnet 6 and the bottom wall 7c are in
close contact with each other, a slit groove 7e having a width dimension capable of mounting the
magnet 6 is formed, and the side wall 7c acts as a yoke. There is. In the diaphragm 2, a gap of a
predetermined size is formed between the coil 4 and the side wall 7c. Further, the side wall 7c of
the base 7 can be supported by the casing 8 on the side of an electronic device such as a mobile
phone using the electroacoustic transducer 1 of the present invention at the upper side in the
drawing. The electro-acoustic transducer device 1 according to the first embodiment of the
present invention having the above-described configuration is configured such that when an
alternating current using a sound signal as an electrical signal is supplied to the coil 4 of the
vibration generating drive source 3 Accordingly, the magnetic field generated in the coil 4 and
the magnetic field of the magnet 6 act to vibrate the coil 4 in the vertical direction via the
cushion member 5 and the diaphragm 2 is in a direction perpendicular to the surface of the
diaphragm 2 It vibrates in the arrow B direction. When the electro-acoustic transducer 1 of the
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present invention is a speaker, the diaphragm 2 vibrates according to the sound signal to output
a sound of a predetermined frequency to the outside. When the electroacoustic transducer 1
according to the present invention is a microphone, when the diaphragm 2 vibrates due to the
sound from the outside, the coil vibrates three times in synchronization with the vibration of the
diaphragm, and an induced electromotive force is generated in the coil 3 Occurs.
The electric signal of the current generated by the induced electromotive force is input as a
sound signal. In the electro-acoustic transducer 1 of the first embodiment of the present
invention, since the coil 4 is directly wound around the outer peripheral end face 2 a of the
diaphragm 2, the number of parts can be reduced and the coil of the diaphragm 2 is used. It is
possible to reduce the number of assembling steps for attaching four. Further, as shown in FIGS.
2 and 3, the electroacoustic transducer 11 of the second embodiment of the present invention is
provided with a diaphragm 12 made of a transparent acrylic plate or the like, and this diaphragm
As shown in FIG. 2, an end 12a on the lower side, two sides 12b and 12b orthogonal to the one
end 12a and opposing each other, and the other end 12c on the side opposing the one end 12a
And the outer diameter is formed in a rectangular shape. Then, on the back surface of the
diaphragm 12 near the one end 12a, three bobbins 12d are formed standing in a rod shape with
a predetermined interval along the one end 12a. Further, on the back surface side of the
diaphragm 12 near the one end portion 12 a, a vibration generating drive source 13 capable of
vibrating and driving the diaphragm 12 is disposed. The vibration generating drive source 13 is
formed with a laterally elongated coil 14 wound so as to be bridged between the bobbins 12 d at
both left and right ends, and the coil 14 has a hollow inner peripheral portion 14 a formed in a
horizontally elongated shape There is. A laterally long magnet 15 made of a permanent magnet is
disposed on the inner circumferential portion 14 a of the coil 14, and the magnet 15 is disposed
with a predetermined gap with the inner circumferential surface of the coil 14. Further, the
magnets 15 are respectively disposed on the respective inner peripheral portions 14a between
the bobbins 12d and 12b formed with a predetermined interval along the one end 12a. That is, a
plurality of (two) magnets 15 are disposed on the inner peripheral portion of the coil 14. The
magnet 15 is fixed to a substantially central portion of a base portion 16 a of the first yoke 16
having a substantially U-shaped cross section with an adhesive or the like. Further, in the first
yoke 16, arms 16b and 16b are respectively formed on the outer side facing the outer peripheral
surface of the coil 14, and a gap of a predetermined size is formed between the outer peripheral
surface of the coil 14 and each arm 16b and 16b. Is formed. Further, a plate-shaped second yoke
17 is fixed to the magnet 15 on the side facing the back surface of the diaphragm 12, and the
second yoke 17 makes the magnetic field of the magnet 15 90 ° to the coil 14 side. It is
supposed to bend. In the diaphragm 12, one end 12a and two opposing sides 12b, 12b are
supported by a cushion member 18 made of polyurethane foam or the like having elasticity, and
the other end 12c is a synthetic resin, metal or the like. Supported by a rigid body 19.
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The cushion member 18 and the rigid body 19 are supported by a plate-like base 20, one of
which supports the diaphragm 12 and the other of which is disposed on the side facing the
diaphragm 12. The first yoke 16 attached is fixed. In the first yoke 16 to which the magnet 15 is
fixed, the base 16a is fixed to the base 20 with an adhesive or the like, and the space between the
upper end of the arm 16b and the back surface of the diaphragm 12 and the base 16a A gap of a
predetermined size is formed between the lower end portion of the coil 14 and the coil 14.
Therefore, when an alternating current is supplied to the coil 14, the coil 14 moves up and down
according to the law of framing, and the diaphragm 12 moves through the cushion member 18
with the rigid member 19 supporting the other end 12c as a fulcrum. It vibrates in the direction
orthogonal to the plane of. In the assembly of the electroacoustic transducer 11 according to the
second embodiment as described above, first, the coil 14 is bridged between the pair of bobbins
12 d from the left and right ends of the back surface of the diaphragm 12 and wound. By doing
this, the diaphragm 12 and the coil 14 are integrated. Next, the cushion member 18 is bonded to
the one end 12a of the back surface of the diaphragm 12 and the pair of side portions 12b and
12b facing each other. Further, the rigid body 19 is adhered to the other end 12 c side of the
back surface of the diaphragm 12. Next, using a positioning jig or the like at a predetermined
position of the base 20, two first yokes 16 in which the magnets 15 to which the second yokes
17 are integrated in advance are fixed with an adhesive or the like are Stick. Next, the base 20 to
which the first yoke 16 is fixed is fixed to the rigid body 19 and the cushion member 18 with an
adhesive or the like in a state where the base 20 is positioned on the rigid body 19. Then, gaps of
predetermined dimensions are respectively formed between the inner peripheral surface of the
coil 14 and the magnet 15 and between the outer peripheral surface of the coil 14 and the arm
portion 16 b of the first yoke 16. The electroacoustic transducer 11 of the form is assembled. In
the electro-acoustic transducer 11 of the second embodiment assembled in this manner, the coil
14 is directly wound around the diaphragm 12 through the bobbin 12 d formed on the
diaphragm 12, And the coil 14 are integrated, the number of parts can be reduced and the
number of assembling steps can be reduced. Further, in the second embodiment of the present
invention, although three bobbins 12d are formed, it is sufficient that at least one pair of bobbins
12d be formed. Moreover, although the magnet 15 was demonstrated by what was arrange |
positioned two pieces, 1 piece or 3 or more pieces may be sufficient.
In the second embodiment of the present invention, although the bobbin 12 d is integrally
formed on the diaphragm 12, the bobbin 12 d separately formed on the diaphragm 12 is formed
on the diaphragm 12. It may be inserted into the hole (not shown) or bonded to the diaphragm
12. In the second embodiment, the other end 12 d of the diaphragm 12 is supported by the rigid
body 19. However, the rigid member 19 may be supported by the cushion member 18 instead of
the rigid body 19. Although the vibration generating drive source 13 has been described as the
first yoke 16 having the magnet 15 attached thereto fixed to the base 20, although not shown,
the first yoke having the magnet attached is connected The vibration generating drive source
may be suspended from the base 20 by being suspended from the diaphragm 12 by a member.
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As described above, according to the present invention, the coil is directly wound around the
diaphragm along the outer peripheral end face of the diaphragm, and the support of the elastic
cushion member near the outer peripheral end of the diaphragm is supported. Since the magnet
is disposed on the side facing the coil via the cushion member, the coil can be integrated with the
diaphragm, the number of parts can be reduced and the number of assembling steps can be
reduced, and the cost can be reduced. It is possible to provide a possible electroacoustic
transducer. In addition, since a gap is formed between the coil wound around the diaphragm and
the side wall of the base, the diaphragm supported by the cushion member can be reliably
vibrated. Further, the vibration generating drive source is formed on the diaphragm since it
comprises a coil wound across at least a pair of bobbins and a magnet disposed on the inner
peripheral portion of the coil between the pair of bobbins. The coil can be integrated with the
diaphragm via the bobbin, and the number of parts can be reduced and the number of
assembling steps can be reduced. Further, since the diaphragm supports the other end side
opposite to the one end with a rigid body, the gap between the coil and the magnet can be
reliably formed at the time of assembly, and the assembly is easy. Electroacoustic transducer can
be provided. Further, since a plurality of magnets are disposed on the inner peripheral portion of
the coil, the magnetic force of the magnet acting on the coil can be strengthened to increase the
amplitude of the diaphragm. Therefore, in the case of a speaker, a large volume can be output.
<Brief Explanation of Drawings> <Figure 1> It is the principal part cross section diagram which
explains the form of 1st execution regarding this invention. FIG. 2 is a plan view of a second
embodiment of the present invention. FIG. 3 is a sectional view of an essential part of a second
embodiment according to the present invention.
FIG. 4 is a cross-sectional view of an essential part for explaining a conventional electroacoustic
transducer. Explanation of the code 1 electro-acoustic transducer device of 1st execution form 2
diaphragm 2a peripheral edge part 3 vibration generating drive source 4 coil 5 cushion member
6 magnet 7 base 7a bottom wall 7b opening 7c side wall 8 case 11 electro-acoustic transducer
12 of the second embodiment 12 diaphragm 13 vibration generating drive source 14 coil 15
magnet 16 first yoke 17 second yoke 18 cushion member 19 rigid body 20 base
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