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JP2013223111

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DESCRIPTION JP2013223111
Abstract: PROBLEM TO BE SOLVED: To simplify a drive circuit in an electroacoustic transducer
that combines a receiver and a speaker. SOLUTION: A first voice coil 6 is provided around the
first permanent magnet 3, a yoke 2 is provided around the first permanent magnet 3, and a
second voice coil 8 is provided around the first permanent magnet 3. A second permanent
magnet 4 is provided on the housing. The upper portion of the first voice coil 6 is fixed to the
lower surface of the first vibrating membrane 5. The upper portion of the second voice coil 8 is
fixed to the lower surface of the second vibrating membrane 7. When used as a receiver, a
current is supplied to the first voice coil 6 to vibrate the first diaphragm 5, and when used as a
speaker, a current is supplied to the second voice coil 8, The vibrating membrane 7 is vibrated.
As described above, the drive circuit can be used as a receiver only by supplying a current to the
first voice coil 6 and can be used as a speaker only by flowing a current to the second voice coil
8. Can be simplified. [Selected figure] Figure 2
Electro-acoustic transducer
[0001]
The present invention relates to an electroacoustic transducer that combines a receiver and a
speaker.
[0002]
In the conventional electroacoustic transducer that combines a receiver and a speaker, a
piezoelectric diaphragm is provided at the center of the housing, a sound hole is provided in the
housing facing one surface of the piezoelectric diaphragm, and the other surface of the
piezoelectric diaphragm is provided. There is a case in which a braking hole and an adjustment
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hole are provided in the case facing each other, and an adjustment valve for opening and closing
the adjustment hole by an electric signal is provided in the case in the vicinity of the adjustment
hole.
[0003]
Japanese Patent Application Laid-Open No. 2006-304021
[0004]
In the above-mentioned conventional electroacoustic transducer, when used as a receiver, by
closing the adjustment hole with the adjustment valve, the damping action by the braking hole is
obtained, and when the piezoelectric diaphragm vibrates in this state, the sound hole A sound
with a relatively low sound pressure level is emitted from and used as a receiver.
On the other hand, when used as a speaker, by not closing the adjustment hole with the
adjustment valve, the damping action by the braking hole can not be obtained, and when the
piezoelectric diaphragm vibrates in this state, the sound pressure level from the sound hole Emits
a relatively high sound and is used as a speaker.
[0005]
However, in the above-described conventional electroacoustic transducer, there is a problem that
the drive circuit becomes complicated because it is necessary to electrically control the adjusting
valve.
[0006]
Then, this invention aims at providing the electroacoustic transducer which can simplify a drive
circuit.
[0007]
An electro-acoustic transducer according to the present invention comprises a first permanent
magnet, a yoke provided around the first permanent magnet, a second permanent magnet
provided around the yoke, and the yoke. A first voice coil provided between the first permanent
magnet, a first vibrating membrane provided above the first voice coil, the yoke, and the second
permanent magnet A second voice coil provided between the second voice coil and a second
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vibrating membrane provided above the second voice coil, and when used as a receiver, the first
vibrating membrane and the second One of the diaphragms of the above-mentioned diaphragms
is vibrated, and when it is used as a speaker, at least the other diaphragm is vibrated.
[0008]
According to the present invention, the drive circuit can be simplified.
[0009]
FIG. 1 is a plan view of an electroacoustic transducer as a first embodiment of the present
invention.
Sectional drawing which follows the II-II line of FIG.
The figure shown in order to demonstrate a frequency sound pressure characteristic.
Sectional drawing similar to FIG. 2 of the electroacoustic transducer as 2nd Embodiment of this
invention.
[0010]
First Embodiment FIG. 1 shows a plan view of an electro-acoustic transducer as a first
embodiment of the present invention, and FIG. 2 shows a cross-sectional view taken along the
line II-II of FIG.
This electroacoustic transducer is provided with a bottomed cylindrical frame 1 made of resin.
A bottomed cylindrical yoke 2 is fixed to the upper central portion of the bottom of the frame 1
with an adhesive (not shown).
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[0011]
A cylindrical first permanent magnet 3 is fixed to an upper central portion of the bottom of the
yoke 2 with an adhesive (not shown).
A cylindrical second permanent magnet 4 is fixed to the outer periphery of the bottom upper
surface of the frame 1 with an adhesive (not shown). Here, as an example, the height position of
the upper surface of the yoke 2 is the same as the height position of the upper surface of the
frame 1. The height position of the top surface of the first permanent magnet 3 is lower than the
height position of the top surface of the yoke 2. The height position of the top surface of the
second permanent magnet 4 is lower than the height position of the top surface of the frame 1.
[0012]
The outer peripheral portion of the lower surface of the first circular diaphragm 5 made of
polyethylene terephthalate or the like is fixed to the inner peripheral surface of the upper surface
of the yoke 2 with an adhesive (not shown). The upper part of the first voice coil 6 is fixed to a
predetermined place on the lower surface of the first vibrating membrane 5 via an adhesive (not
shown). The first voice coil 6 is vertically movably disposed between the yoke 2 and the first
permanent magnet 3.
[0013]
The inner peripheral portion of the lower surface of the second ring-shaped vibrating film 7
made of polyethylene terephthalate or the like is fixed to the outer peripheral portion of the
upper surface of the yoke 2 via an adhesive (not shown). The outer periphery of the lower
surface of the second vibrating membrane 7 is fixed to the upper surface of the frame 1 via an
adhesive (not shown). The upper part of the second voice coil 8 is fixed to a predetermined place
on the lower surface of the second vibrating membrane 7 via an adhesive (not shown). The
second voice coil 8 is vertically movably disposed between the yoke 2 and the second permanent
magnet 4.
[0014]
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Here, the first diaphragm 5 is designed to vibrate in a low frequency band of about 300 Hz in
order to be suitable for a receiver application. The second diaphragm 7 is designed to vibrate in a
frequency band of 1 kHz or more in order to be suitable for a speaker application.
[0015]
Therefore, when this electroacoustic transducer is used as a receiver, when current flows through
the first voice coil 6, the first diaphragm 5 vibrates and can be used as a receiver. On the other
hand, when the piezoelectric electroacoustic transducer is used as a speaker, when current flows
through the second voice coil 8, the second diaphragm 7 vibrates and can be used as a speaker.
[0016]
As described above, in this electro-acoustic transducer, it can be used as a receiver only by
supplying a current to the first voice coil 6, and can be used as a speaker only by supplying a
current to the second voice coil 8. Therefore, there is no need to electrically control such a
regulating valve, and the drive circuit can be simplified.
[0017]
Further, in this electroacoustic transducer, since it is constituted by two magnetic circuits of the
first magnetic circuit including the first permanent magnet 3 and the second magnetic circuit
including the second permanent magnet 4, the speaker Power consumption can be reduced
because the magnetic circuit to be used can be selected according to the usage of the receiver
and the required sound pressure level.
Further, it is possible to form the two permanent magnets 3 and 4 with different compositions,
for example, ferrite and neodymium, respectively, which is effective for the rare earth supply
problem and cost reduction.
[0018]
In addition, when using it as a speaker, a higher sound pressure level can be obtained by
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supplying a current not only to the second voice coil 8 but also to the first voice coil 6. For
example, referring to the frequency sound pressure characteristics shown in FIG. 3, when the
current is supplied only to the second voice coil 8, the frequency sound pressure characteristics
shown by the solid line can be obtained. Also, when current flows, higher sound pressure levels
are obtained as indicated by the solid line than indicated by the dotted line. Also in this case, the
drive circuit can be simplified because it is only necessary to supply current to the first voice coil
6 and the second voice coil 8.
[0019]
Here, conversely to the above, the first diaphragm 5 is designed to vibrate at a frequency band of
1 kHz or higher so as to be suitable for a speaker application, and the second diaphragm 7 is to
be suitable for a receiver application When designed to vibrate in a low frequency band with a
frequency of about 300 Hz, it is possible to use it as a speaker by supplying a current to the first
voice coil 6, as a matter of course. When current flows, it can be used as a receiver.
[0020]
By the way, since the height position of the upper surface of the second permanent magnet 4 is
lower than the height position of the upper surface of the frame 1, when the second vibrating
film 7 vibrates, the second permanent magnet 4 disturbs As compared with the case where the
lower surface of the second vibrating membrane 7 is fixed to the upper surface of the second
permanent magnet 4, the vibration area of the second vibrating membrane 7 can be increased.
[0021]
Second Embodiment FIG. 3 is a cross-sectional view similar to FIG. 2 of an electroacoustic
transducer as a second embodiment of the present invention.
This electro-acoustic transducer differs from the electro-acoustic transducer shown in FIG. 2 in
that the first diaphragm 5 and the second diaphragm 7 are formed by a single diaphragm 11.
In this case, the outer peripheral surface of the lower surface of one vibrating film 11 is fixed to
the upper surface of the frame 1 through an adhesive (not shown), and a predetermined ringshaped portion of the lower surface is an adhesive (see FIG. (Not shown).
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[0022]
In this case, as compared with the case shown in FIG. 2, only one vibrating membrane 11 is
sufficient, so that the number of parts can be reduced, and the cost can be reduced. The number
of adhesions via the adhesive to the yoke 2 is reduced from 4 to 2, and the assembly operation
can be facilitated accordingly.
[0023]
Hereinafter, aspects of the present invention will be collectively described as a supplementary
note.
[0024]
(Supplementary Note 1) The invention of Supplementary Note 1 includes a first permanent
magnet, a yoke provided around the first permanent magnet, a second permanent magnet
provided around the yoke, and the yoke. A first voice coil provided between the first permanent
magnet, a first vibrating membrane provided above the first voice coil, the yoke, and the second
permanent magnet A second voice coil provided between the second voice coil and a second
vibrating membrane provided above the second voice coil, and when used as a receiver, the first
vibrating membrane and the second The electro-acoustic transducer is characterized in that one
of the diaphragms is vibrated and, when it is used as a speaker, at least the other diaphragm is
vibrated.
[0025]
(Supplementary Note 2) In the invention according to Supplementary Note 1, the electro-acoustic
conversion is characterized in that, when used as a speaker, the first diaphragm and the second
diaphragm are vibrated together. It is an apparatus.
[0026]
(Supplementary Note 3) In the invention according to Supplementary Note 1 or 2, in the
invention described in Supplementary Note 1 or 2, a bottomed cylindrical frame, the bottomed
cylindrical yoke provided in the upper surface central portion of the bottom of the frame, and the
yoke Between the first permanent magnet provided at the central portion of the upper surface of
the cylinder, the second permanent magnet having a cylindrical shape provided at the outer
periphery of the upper surface of the bottom of the frame, the yoke and the first permanent
magnet And the second voice coil provided between the yoke and the second permanent magnet
so as to be able to move up and down. This is an electro-acoustic transducer.
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[0027]
(Supplementary Note 4) In the invention according to Supplementary Note 4, in the invention
described in Supplementary Note 3, the first vibrating membrane has a circular shape, and the
lower surface outer peripheral portion of the first vibrating membrane is fixed to the upper
surface of the yoke; The second diaphragm has a ring shape, the lower inner periphery of the
second diaphragm is fixed to the upper surface of the yoke, and the lower outer periphery of the
second diaphragm is fixed to the upper surface of the frame. An electro-acoustic transducer
characterized by
[0028]
(Supplementary Note 5) In the invention according to Supplementary Note 5, in the invention
described in Supplementary Note 3, the first vibrating membrane is formed by a central portion
of one circular vibrating membrane, and the second vibrating membrane is the one sheet. The
electroacoustic transducer is characterized in that it is formed by the outer peripheral portion of
the vibrating membrane, and the one vibrating membrane is fixed to the upper surface of the
yoke and the upper surface of the frame.
[0029]
(Supplementary Note 6) The invention of Supplementary Note 6 is characterized in that, in the
invention described in Supplementary Note 4 or 5, the height position of the upper surface of the
second permanent magnet is lower than the height position of the upper surface of the frame.
This is an electro-acoustic transducer.
[0030]
1 frame 2 yoke 3 first permanent magnet 4 second permanent magnet 5 first diaphragm 6 first
voice coil 7 second diaphragm 8 second voice coil
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