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JP2006067114

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DESCRIPTION JP2006067114
The present invention relates to an electro-acoustic transducer used for audio equipment, video
equipment, and information communication equipment, and it is an object of the present
invention to provide a thin electro-acoustic transducer. SOLUTION: The conductor 20 forming
the diaphragm 16 is made into a foil shape, and the insulating portions 18a and 18b are
provided, and the diaphragm can be formed only by the conductor having the insulation portion.
Since the conductor itself can be made to function as a diaphragm, a base for holding a coil as in
the prior art is not required, and thickness reduction can be achieved. [Selected figure] Figure 1
Electro-acoustic transducer
[0001]
The present invention relates to an electroacoustic transducer used for various audio devices,
video devices, and information communication devices.
[0002]
The electro-acoustic transducer is often used as a set on which the electro-acoustic transducer is
mounted, such as mobile phones, stereo sets, electronic devices such as televisions, and mobile
devices such as automobiles.
[0003]
As these electronic devices have recently become smaller and thinner as market trends,
especially in the information communication field such as mobile phones, along with the
advancement of functions such as camera function loading, the ever smaller size and thinner It
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has come to be requested.
[0004]
With the background of such market trends, thinning of the electroacoustic transducers used in
these electronic devices and devices is strongly demanded.
[0005]
The vibration system of the conventional electro-acoustic transducer is constituted by a voice coil
for inputting an electric signal, and a diaphragm which is coupled to the voice coil, receives
transmission of vibration of the voice coil, and acoustically converts the vibration. .
[0006]
For this reason, the diaphragm and the voice coil are indispensable components in constructing
the electroacoustic transducer.
In order to reduce the thickness of the electroacoustic transducer, a structure of a flat speaker as
shown in FIG. 3 which is a kind of electroacoustic transducer has been proposed.
[0007]
FIG. 3 shows the configuration of a conventional flat speaker, and FIG. 3 (a) is a cross-sectional
view taken along the line CC 'in (b) and (c), and FIG. 3 (b) is in the plane ZZ' in (a) FIG. 7C is a
plan view of the diaphragm.
[0008]
In FIG. 3, reference numeral 101 denotes a box-shaped yoke made of iron or the like and open at
one end.
The yoke 101 is surrounded by a frame 102 made of a resin material such as nonmagnetic
polycarbonate.
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[0009]
A permanent magnet 103 is installed on one side of the yoke 101 so that its magnetic axis is
vertical, and a plate 104 made of iron or the like is placed on the upper side of the permanent
magnet 103 for the purpose of stabilizing the leakage flux. There is.
A magnetic circuit 105 is composed of the yoke 101, the permanent magnet 103 and the plate
104.
[0010]
Reference numeral 106 denotes a diaphragm disposed at a predetermined distance from the
plate 104, which is supported by a support member 107 made of flexible urethane or the like so
that the diaphragm 106 can be smoothly oscillated up and down. It is done.
[0011]
Further, the diaphragm 106 is configured by adhering and fixing a spiral voice coil 109 formed
by winding an aluminum wire or the like on one surface of a film base 108 of insulating
polyimide or the like.
[0012]
With such a configuration, when current flows in the direction shown in the spiral voice coil 109,
the spiral voice coil 109 is affected by the leakage magnetic field formed by the magnetic circuit
105, that is, the magnetic flux in the H direction in the figure. On the other hand, in accordance
with Fleming's left-hand rule, the diaphragm 106 is vibrated up and down by the current flowing
through the spiral voice coil 109 to generate a sound because it receives an electromagnetic
force in the direction of F.
[0013]
Further, as a conventional speaker provided with a thinned diaphragm, a ribbon speaker having a
ribbon diaphragm having the functions of the above-described diaphragm and a voice coil has
been proposed, and the configuration thereof is shown in FIG.
[0014]
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FIG. 4 shows the configuration of a conventional ribbon speaker, where (a) is a cross-sectional
view and (b) is a plan view.
[0015]
In FIG. 4, 201 is a yoke made of iron or the like, 202 is a permanent magnet magnetized in the
horizontal direction with respect to the diaphragm, 203 is a plate made of iron or the like, and
the yoke 201, permanent magnet 202, and plate 203 The magnetic circuit 204 is configured
such that the magnetic gap 207 is formed.
A ribbon diaphragm 205 is a thin foil of a conductor such as aluminum. The ribbon diaphragm
205 is disposed in the magnetic gap 207 and supported by the holding portion 206.
[0016]
The ribbon diaphragm 205 receives an electromagnetic force in the f direction according to
Fleming's left hand law with respect to the magnetic field in the h direction generated by the
magnetic circuit 204 when current flows in the arrow direction in the drawing.
With such a configuration, the current flowing through the ribbon diaphragm 205 vibrates up
and down to generate a sound.
[0017]
In addition, as prior art document information regarding these inventions, patent document 1, 2
is known, for example.
JP 2001-333493 A JP JP 2000-308195 A
[0018]
However, in order to thin the diaphragm in the conventional flat speaker, if it is necessary to
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form a coil on the base material such as a film, the base material will be thick. And it was difficult
to reduce the thickness of the diaphragm.
[0019]
Also, even with the conventional ribbon speaker, securing the size of the diaphragm necessary to
improve the sound pressure level requires a larger magnetic circuit, making it difficult to
miniaturize and thin the entire speaker. It was a thing.
[0020]
In order to achieve the above object, the present invention is particularly characterized in that a
thin foil-like conductor provided with an insulating portion is configured as a diaphragm.
[0021]
According to the present invention, the diaphragm can be formed of only the conductor having
the insulating portion by the above-mentioned characteristic configuration, and the conductor
itself can be functioned as a diaphragm. Therefore, a base for holding a coil as in the prior art
The present invention provides an electroacoustic transducer that can be made thinner by
eliminating the need for materials.
[0022]
Hereinafter, the speaker which is a kind of the electroacoustic transducer of this invention is
demonstrated using drawing.
[0023]
Embodiment 1 FIG. 1 shows the configuration of a speaker according to Embodiment 1 of the
present invention, and FIG. 1 (a) is a cross-sectional view taken along the line AA 'of (b) and (c),
(A) is a cross-sectional view in the XX 'plane in (a), (c) is a plan view of the diaphragm, (d) is a
part of the cross-sectional view of the diaphragm.
[0024]
In FIG. 1A, reference numeral 11 denotes a yoke made of iron or the like, and two plates project
upward from the bottom plate.
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The yoke 11 is surrounded by a frame 12 made of nonmagnetic polycarbonate or the like.
[0025]
A permanent magnet 13 is installed on one side of the yoke 11 so that its magnetic axis is
vertical, and a plate 14 made of iron or the like is placed on the top of the permanent magnet 13
for the purpose of stabilizing the leakage flux. There is.
A magnetic circuit 15 is composed of the yoke 11, the permanent magnet 13 and the plate 14.
[0026]
The central axis in the longitudinal direction of the plate 14 is offset to the right in the figure
with respect to the magnetic axis of the permanent magnet 13.
By this configuration, the direction of the leakage flux in the magnetic circuit 15 is generated in
one direction to the right in the figure.
[0027]
A diaphragm 16 is disposed at a predetermined distance from the plate 14 and is supported by a
support member 17 made of flexible urethane or the like so that the diaphragm 16 can be
smoothly oscillated up and down. It is configured.
[0028]
Further, in FIGS. 1 (c) and 1 (d), the diaphragm 16 slits the thin foil-like conductor 20 made of
aluminum or the like to form a strip, and the conductor 20 is formed of a liquid of resin material
such as polyimide. And the insulating portion 18 a and the insulating portion 18 b are provided
around the strip-like conductor 20.
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By setting the total length of the insulating portion 18a to be shorter than the length of the
diaphragm 16, electrical continuity is maintained in the lateral direction shown in FIG. 1 at both
end portions 19a and 19b of the diaphragm 16. There is.
[0029]
By fixing both end portions 19a and 19b of the diaphragm 16 on the frame 12, it can be used as
a terminal (not shown) for inputting an audio electrical signal.
At this time, it is preferable to use a highly flexible conductor (not shown) such as a gold wire for
connection between each of the end portions 19a and 19b of the diaphragm 16 and the terminal.
Thus, the vertical amplitude of the diaphragm 16 can be easily secured between the diaphragm
16 and the terminal provided on the frame 12.
[0030]
The speaker of this embodiment configured as described above operates as follows.
That is, a magnetic field in the H direction in the figure is generated by the magnetic circuit 15
composed of the yoke 11, the permanent magnet 13 and the plate 14.
In this magnetic field, the diaphragm 16 is vibrated up and down by the current flowing in the
conductor 20 to generate a sound, since it receives an electromagnetic force in the F direction
according to Fleming's left hand law with respect to the current in the illustrated direction.
Become.
[0031]
In an example such as a conventional flat speaker, the film base 108 for holding the spiral voice
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coil 109 serving as a voice coil is required, but according to the present embodiment, thin foil
conductive By slitting the body 20 and forming the insulating portions 18a and 18b, it is possible
to obtain a self-inductance necessary as a voice coil.
As a result, the diaphragm 16 can be formed only by the conductor 20, and the conductor 20
itself serving as a voice coil in a conventional speaker can be made to function as the diaphragm
16. The film base 108 for holding the spiral voice coil 109, such as a speaker, becomes
unnecessary, and thickness reduction can be achieved.
[0032]
Furthermore, in the configuration of the conventional flat speaker, in principle, vibration
transmission loss occurs in bonding between the film base 108 which is the diaphragm 106 and
the spiral voice coil 109 which is the conductor, and Bonding failure or peeling may occur due to
a decrease in adhesive strength due to weight increase and joule heat generation in the spiral
voice coil 109, but according to the present embodiment, the film base 108 is not required. As a
result, no bonding displacement or peeling occurs.
[0033]
Also, in the conventional flat speaker, the spiral voice coil 109 is formed on the film base 108 in
accordance with the generation area of the magnetic field by the magnetic circuit 105 in order to
reduce the weight of the diaphragm 106. However, according to the present embodiment, since
the conductor 20 is present over the entire diaphragm 16, the vibration mode as the diaphragm
16 can be stabilized. It can be configured.
As a result, unnecessary resonance in the diaphragm 16 can be eliminated, and sound pressure
frequency characteristics and distortion can be improved.
[0034]
Further, according to the present embodiment, as compared with the configuration of the
conventional flat speaker, the conductor 20 can be uniformly disposed without a gap, so that the
space factor of the conductor 20 in the magnetic field is high. It is possible to arrange uniformly,
to improve the conversion efficiency, and to obtain stable upper and lower amplitudes in which
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rolling does not occur.
Therefore, it is possible to improve the sound pressure level and to lower the distortion.
[0035]
In the present embodiment, although foil-like aluminum is used for the conductor 20 forming the
diaphragm 16, the weight reduction of the diaphragm 16 can be achieved by this, and for higher
frequency band reproduction. It can be a suitable speaker.
On the other hand, if foil-like copper is used for the conductor 20, corrosion resistance will
improve and it can be set as the speaker which can aim at stability of quality.
[0036]
By using a foil-like alloy of aluminum and copper for the conductor 20, both of the above
features can be obtained, and a speaker suitable for a wider frequency band can be obtained.
[0037]
In the present embodiment, the conductor 20 forming the diaphragm 16 is one layer in FIG. 1A,
but the sound pressure level can be improved by laminating two or more layers. .
[0038]
In the present embodiment, when aluminum or an alloy of aluminum and copper is used for
conductor 20, the insulating portions 18a and 18b are immersed in a resin solution to form
insulating portions 18a and 18b. May use an alumite treatment.
By using the alumite treatment, the antirust effect can be improved.
[0039]
Second Embodiment FIG. 2 shows a configuration of a speaker when the insulating portion 18 a
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is formed in a spiral shape in the diaphragm 16 according to a first embodiment of the present
invention.
[0040]
2 (a) is a cross-sectional view taken along the line BB 'in (b) and (c), (b) is a cross-sectional view
taken along the line YY' in (a), and (c) is a plane of the diaphragm. The figure (d) is a part of
sectional drawing of a diaphragm.
[0041]
In FIG. 2A, reference numeral 21 denotes a box-shaped yoke made of iron or the like and having
one open.
The yoke 21 is surrounded by a frame 22 made of a resin material such as nonmagnetic
polycarbonate.
[0042]
A permanent magnet 23 is installed on one side of the yoke 21 so that its magnetic axis is
vertical, and a plate 24 made of iron or the like is placed on the top of the permanent magnet 23
for the purpose of stabilizing the leakage flux. There is.
A magnetic circuit 25 is composed of the yoke 21, the permanent magnet 23 and the plate 24.
[0043]
By aligning the center of the plate 24 with the magnetic axis of the permanent magnet 23 and
configuring the magnetic circuit 25 as shown, magnetic flux is generated radially from the
center.
[0044]
Further, in FIGS. 2C and 2D, the diaphragm 26 has a slit formed in a thin foil-like conductor 30
made of aluminum or the like in a spiral shape, and the conductor 30 is immersed in a liquid of
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resin material such as polyimide. In the same manner as in the first embodiment, the insulating
portion 28a and the insulating portion 28b are provided.
[0045]
The diaphragm 26 is disposed at a predetermined distance from the plate 24 and is supported by
a support member 27 made of flexible urethane or the like, whereby the diaphragm 26 is
configured to be able to smoothly swing vertically. ing.
[0046]
The conductor 30 is extended from the spiral center of the diaphragm 26 with a jumper (dotted
line portion in the figure) or the like to form both end portions 29a and 29b and fixed on the
frame 22 to input an audio electric signal (figure Use as not shown).
At this time, it is preferable to use a highly flexible conductor (not shown) such as a gold wire for
connection between each of the end portions 29a and 29b and the terminal.
[0047]
Thus, the vertical amplitude of the diaphragm 26 can be easily secured between the diaphragm
26 and the terminal provided on the frame 22.
[0048]
The speaker of this embodiment configured as described above operates as follows.
That is, a magnetic field in the H direction in the figure is generated by the magnetic circuit 25
formed by the yoke 21, the permanent magnet 23 and the plate 24.
In this magnetic field, the diaphragm 26 is vibrated up and down by the current flowing through
the conductor 30 to generate a sound, since it receives an electromagnetic force in the F
direction according to Fleming's left hand law with respect to the current in the illustrated
direction. Become.
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[0049]
As described above, according to the present embodiment, the same effect as that of the first
embodiment can be obtained only by replacing the conventional diaphragm 106 with the
diaphragm 26 as shown in FIG. 2C.
[0050]
As in the above embodiment, by making the foil-like conductor itself function as a diaphragm and
forming the magnetic circuits 15, 25 according to the shapes of the insulating portions 18a, 18b,
28a, 28b, the electroacoustic transducer Thinning is possible.
[0051]
In addition, although the above-mentioned description was implemented about the speaker, it is
not limited to a speaker and can be widely developed about an electroacoustic transducer, such
as a receiver and a microphone.
[0052]
As described above, since the electro-acoustic transducer according to the present invention can
be made thin, it can be applied to electronic devices such as video and audio equipment and
information communication equipment which need to be made thin, and devices such as
automobiles.
[0053]
(a) A cross-sectional view of the speaker according to the first embodiment of the present
invention, (b) a cross-sectional view of the speaker according to the first embodiment of the
present invention, (c) a plan view of a diaphragm of the speaker according to the first
embodiment of the present invention (D) Cross-sectional view of diaphragm of loudspeaker
according to Embodiment 1 of the present invention (a) Cross-sectional view of loudspeaker
according to the second embodiment of the present invention (b) Cross-sectional view of
loudspeaker according to the second embodiment of the present invention , (C) a plan view of the
diaphragm of the speaker according to the second embodiment of the present invention, (d) a
sectional view of the diaphragm of the speaker according to the second embodiment of the
present invention (a) a sectional view of a conventional flat speaker, b) Cross-sectional view of a
conventional flat speaker, (c) Top view of diaphragm of conventional flat speaker (a) Crosssectional view of conventional ribbon speaker, (b) Top view of conventional ribbon speaker
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Explanation of sign
[0054]
11, 21, 101, 201 yoke 12, 22, 102 frame 13, 23, 103, 202 permanent magnet 14, 24, 104, 203
plate 15, 25, 105, 204 magnetic circuit 16, 26, 106 diaphragm 17, 27 , 107 Support members
18a, 18b, 28a, 28b Insulated portions 19a, 19b, 29a, 29b Both end portions 20, 30 Conductor
108 Film base 109 Spiral voice coil 205 Ribbon diaphragm 206 Holding portion 207 Magnetic
gap
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