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JP2000333290

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DESCRIPTION JP2000333290
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer which functions as a microphone or a speaker.
[0002]
2. Description of the Related Art An electroacoustic transducer, in particular an electroacoustic
transducer for a cellular phone, basically comprises a case comprising an upper case and a lower
case, a vibration carrying at least two yokes and a coil divided into two. It is comprised by the
magnet provided with the board and.
[0003]
The diaphragm comprises at least one annular peripheral edge and a spherical or dome-like
central portion, the diaphragm being clamped or glued at its outer edge between the upper and
lower cases.
[0004]
A coil is fixed at the boundary between the peripheral portion and the central portion.
The coil can be fixed to the diaphragm directly or indirectly via a coil carrier (which can be
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omitted by specially configuring the diaphragm).
The coil projects into an annular gap formed between the divided yokes. With this configuration,
the electroacoustic transducer functions as a microphone or a speaker.
[0005]
According to German Patent Publication No. 3935786, a technique for bonding an elastically
deformable elastic body to the lower surface of a concavely curved diaphragm in a speaker to
avoid so-called resonance peaks in a high frequency band Is disclosed.
[0006]
According to U.S. Pat. No. 4,399,334, in the speaker, in order to prevent the coil from completely
coming out of the slit area, the cover of the speaker is provided with a stopper directed to the
diaphragm so that the diaphragm gets out of the slit at maximum height Techniques have been
disclosed.
[0007]
However, in such an electroacoustic transducer, the mechanical stability of the diaphragm may
become a problem when a large pressure acts on the diaphragm.
That is, when pressure is applied to the diaphragm, the diaphragm elastically deforms, but when
an excessive pressure acts on the diaphragm, the diaphragm deforms beyond the elastic limit and
the diaphragm is in its original shape even if the pressure drops thereafter I can not go back to
[0008]
Furthermore, although the water resistance performance required for the electronic device to
which such an electroacoustic transducer is applied is high, a protective cover as seen in mobile
phones, microphones and the like to satisfy the required water resistance performance. Or it is
necessary to take measures such as a special configuration, which causes the use value of the
product in a normal use condition to be reduced.
[0009]
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The present invention has been made in view of the above technical problems, and it is an object
of the present invention to provide an electroacoustic transducer which can maintain mechanical
stability even when a large pressure acts and is excellent in water resistance. To aim.
[0010]
According to a first aspect of the present invention, there is provided a diaphragm having a
central portion and a peripheral portion, and a coil fixed directly or indirectly to the transition
region between the central portion and the peripheral portion. In the electro-acoustic transducer,
wherein the coil protrudes into an annular gap formed between the first yoke and the second
yoke, the support member vibrates between the central portion and the second yoke. It is
characterized in that it is disposed at a distance from the plate.
[0011]
According to a second invention, in the first invention, the area of the support member is 25% or
more of the area of the second yoke.
[0012]
According to a third invention, in the second invention, the area of the support member is 50% or
more of the area of the second yoke.
[0013]
According to a fourth aspect of the present invention, in the first to third aspects, the distance
between the central portion and the support surface of the support member is smaller than the
maximum value of the elastically deformable displacement of the diaphragm. It is said that.
[0014]
A fifth invention is characterized in that, in the first to fourth inventions, the distance between
the central portion and the support surface of the support member is larger than the maximum
displacement of the diaphragm when the diaphragm vibrates. It is
[0015]
According to a sixth aspect, in the first to fifth aspects, the distance between the central portion
and the support surface of the support member is greater than five times the maximum
displacement of the diaphragm when the diaphragm vibrates. It is characterized by
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[0016]
A seventh invention is according to any one of the first to sixth inventions, wherein the distance
between the central portion and the support surface of the support member is greater than 10
times the maximum displacement of the diaphragm when the diaphragm vibrates. It is
characterized by
[0017]
The eighth invention is characterized in that, in the first to seventh inventions, the diaphragm is
made of a water-resistant material such as, for example, a plastic such as lithium carbonate,
polyether ester urethane, PETP foil, Mylar or the like. It is said that.
[0018]
A ninth invention is characterized in that in the first to eighth inventions, a supporting member is
provided also for the peripheral portion.
[0019]
A tenth invention is characterized in that in the ninth invention, the support member provided to
the peripheral portion is constituted by a projecting portion which protrudes in the radial
direction from the case.
[0020]
According to an eleventh aspect of the present invention, in the tenth or eleventh aspect, the
support surface of the support member provided to the peripheral portion extends substantially
in parallel to the peripheral portion. .
[0021]
According to the present invention, the support member is provided at a distance from the
diaphragm between the central portion of the diaphragm and the second yoke below it.
In this way, the deformation of the diaphragm is suppressed below the elastic limit by the
support member, even under the action of a large pressure, for example several meters deep,
until it is flat against the second yoke below it. It is prevented from deforming and returning to
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the original shape.
[0022]
Here, the distance between the diaphragm and the support member in a state in which the same
pressure acts on both sides of the diaphragm needs to be larger than the maximum displacement
(minimum allowable spacing) of the diaphragm when the diaphragm vibrates.
The maximum displacement of the diaphragm can be easily calculated based on the
configuration of the diaphragm used and the response (in the case of a microphone) or the
maximum current (in the case of a loudspeaker or hearing aid) of the diaphragm to the generated
sound waves.
[0023]
Also, the above-mentioned distance needs to be smaller than the distance (maximum allowable
distance) at which the diaphragm starts to cause unrecoverable deformation.
This distance can also be easily obtained by calculation or a simple experiment.
There is no problem even if the support member is at a relatively low position with respect to the
diaphragm because the distance between the two allowable intervals is relatively large.
The distance between the diaphragm and the support member is twice, preferably three times,
particularly preferably ten times the minimum allowable distance.
[0024]
The support member does not have to cover the entire lower surface of the central part of the
diaphragm, but may cover an advantageously circular area of the central part, the diameter of
which is that of the yoke below the central part of the diaphragm. The diameter is at least 20%,
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preferably 40% or more, more preferably 80% or more.
The area of the support surface of the support member achieved thereby is 4%, 16% or more,
64% or more of the area of the yoke.
[0025]
The support member can be formed according to the desired acoustical properties of the
transducer.
Thus, the contact surfaces (herein referring to the lower surface of the diaphragm in contact with
each other and the support surface of the support portion) can be formed to be "dense" or
"transmissive".
[0026]
Here, "dense" refers to a contact surface that is substantially impermeable to air, and "permeable"
refers to any contact surface that is permeable to air.
For example, a lattice-like or comb-like structure, a skeleton-like support (like a bone of an
umbrella), etc. can be considered as the permeable contact surface, and a plate made of plastic or
metal can be considered as the dense contact surface.
[0027]
As can be understood from the above description, the above "dense" and "permeability" are
considered in consideration of the possibility of providing various holes or holes of different sizes
until it becomes a solid net shape, or the possibility of not providing holes. There is also a contact
surface in the middle state of
[0028]
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The geometry and transparency of the support members determine the acoustic friction that
affects the characteristics of the transducer.
Thus, by appropriately configuring the support member, the desired properties can be improved
over conventional or generally the first.
[0029]
In addition, if a water-resistant material such as a known polycarbonate, polyether ester
urethane, PETP foil, Mylar, etc. plastic is used as the material of the diaphragm, the entry of
water into the interior is prevented, and an electroacoustic transducer is obtained. Water
resistance is improved.
[0030]
Furthermore, suitable support members can be provided on the annular peripheral edge of the
diaphragm.
In this case, the support member has a donut shape having an undeformed edge, and the contact
surface has a shape corresponding to the peripheral edge.
What has been said in this specification with respect to the central part of the diaphragm is also
applicable to the periphery of the diaphragm, mutatis mutandis.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the attached drawings.
[0032]
FIG. 1 shows a cross section of an electroacoustic transducer according to the invention.
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The electroacoustic transducer has a case composed of an upper case 1 and a lower case 2.
A magnet 3 is supported on the lower case 2 by a lower yoke 4 (first yoke), and the magnet 3
carries an upper yoke (second yoke).
The lower yoke 4 is in the shape of a bowl whose upper edge is drawn inward.
An annular gap 11 is formed between the lower yoke 4 and the upper yoke 5.
[0033]
The diaphragm 6 is clamped and / or adhered between the upper case 1 and the lower case 2.
The diaphragm 6 has a peripheral portion 7 and a central portion 8, and a coil 9 is fixed, for
example, adhered to a transition area between the peripheral portion 7 and the central portion 8.
The coil 9 projects into an annular gap 11 between the yokes 4, 5. The coil 9 may be fixed to the
diaphragm 6 indirectly via the coil carrier.
[0034]
According to the present invention, the support member 10 is provided in the space below the
central portion 8 of the diaphragm 6. In this embodiment, the support member 10 is mushroomshaped and comprises a leg 10a at its center. The support member 10 is fixed, for example,
adhered to the upper yoke 5 by the leg 10a.
[0035]
The support member 10 may have other structures, for example, a cushion-like structure having
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the upper yoke 5 and a large contact surface. The upper yoke 5 and the lower yoke 4 have a
circular shape in order to form an annular gap 11 from which the coil 9 protrudes.
[0036]
For the same reason, the size of the surface of the upper yoke 5 completely corresponds to the
size of the surface of the central portion 8 of the diaphragm 6, so there should be no difference
in the size of both surfaces.
[0037]
The distance between the diaphragm 6 and the support member 10 in a state in which the same
pressure acts on both sides of the diaphragm is larger than the maximum displacement
(minimum allowable spacing) of the diaphragm when the diaphragm 6 vibrates, and the vibration
is It is set smaller than the distance (maximum allowable spacing) at which the plate 6 causes
unrecoverable deformation.
Specifically, the distance between the diaphragm 6 and the support member 10 is set to twice,
preferably three times, more preferably ten times the minimum allowable distance.
[0038]
Moreover, in this embodiment, the diameter of the support member 10 formed in a circular
shape is approximately 100% of the diameter of the upper yoke 5, but as described above, this is
not necessarily required.
[0039]
Moreover, although the part which contacts the diaphragm 6 of the supporting member 10 is
shown as a continuous line in FIG. 1, this does not show the transmittance | permeability of a
contact surface.
This degree of transmission can be selected arbitrarily over a wide range as described above, or
can be selected depending on the desired acoustic properties.
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[0040]
In this embodiment, the support member is not provided to the peripheral portion 7 of the
diaphragm 6, but the support member may be disposed in this area as well. In this case, if the
lower case 2 is formed of plastic and the support member is integrally molded with the case 2 in
the form of radially extending ribs, it can be manufactured without cost.
[0041]
The manner of fixing the diaphragm 6 and, in particular, the coil 9 to the diaphragm is the same
as that of the known one, and therefore the detailed description is omitted here. Although many
modifications and improvements exist in the prior art, they do not affect the present invention.
[0042]
It is to be noted that what is important to the present invention is to suppress deformation of the
diaphragm within the elastic range even if excessive pressure is applied, so that the shape of the
case may be formed into another shape within a range not affecting the present invention. Is also
possible.
[0043]
In addition, although the electroacoustic transducer shown here is not used in water, the
diaphragm 6 is made of a water resistant material such as polycarbonate, polyether ester
urethane, PETP foil, plastic such as Mylar, etc. Therefore, even if this type of device, for example,
a handy device (mobile phone) is immersed in water, water does not infiltrate the inside of the
diaphragm 6, and after it is out of the water, it is between the upper case 1 and the diaphragm 6
You can use it again if you shake off the water that has entered.
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