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JP2012231289

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DESCRIPTION JP2012231289
The present invention provides an audio signal driver for an actuator speaker that reduces the
volume of the actuator speaker, reduces the weight, and reduces the power consumption. An
actuator speaker audio signal driver (202) comprising a perforated plate electrode (205) and a
diaphragm (210) and coupled to a flat panel type actuator speaker (201). A signal power
amplifier 204, and the signal power amplifier 204 that receives the power amplification voice
signal and converts it into two equal high voltage output signals and outputs the signal to the
porous plate electrode 205 and the diaphragm 210. The audio signal amplification transformer
203 efficiently forms a low pass filter with the actuator speaker 201. [Selected figure] Figure 2
Voice signal driver for actuator speaker
[0001]
The present invention relates to an audio processing apparatus, and more particularly to an
audio signal driver used for a flat panel type actuator speaker.
[0002]
With the development of technology, portable electronic devices are becoming thinner and
lighter and are becoming slimmer.
At the same time, the power problem of electronic devices is also emphasized.
04-05-2019
1
[0003]
Actuator speakers built into conventional portable electronic products require a large volume
and weight of the actuator system that vibrates the flat panel, and require 1.5 to 2 W of power
required by the driver, for the entire electronic device It occupies 20 to 70% of the power. This is
extremely large for portable electronic devices. Accordingly, improvements in flat panel type
actuator speakers are attracting attention.
[0004]
FIG. 1 discloses an audio signal driver 102 of a conventional flat panel type actuator speaker
101. According to the drawing, the audio signal driver 102 is coupled to a capacitor type
actuator speaker 101. The audio signal driver 102 includes an amplifier 108 and a low
bandwidth, high power transformer 109 to receive an input audio signal Sin. The two intensities
are converted to equal positive and negative high voltage output signals So1 and So2.
[0005]
The actuator speaker 101 includes an electrode 104 and an electrode 106 and provides an
extremely thin film 105 between the electrode 104 and the electrode 106. The electrode 106 is a
grid electrode plate or a stator plate. The film 105 receives a high voltage direct current 107.
[0006]
When two positive and negative high-voltage output signals So1 and So2 having the same
strength are applied to the electrode 106 and the electrode 104, respectively, the film 105
vibrates due to the action of suction or repulsion by the electrode 106 and the electrode 104.
Sound comes from here.
[0007]
The conventional flat panel type actuator speaker 101 generates sound using a high voltage
signal.
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2
Thus, a low bandwidth, high power transformer 109 must be used for the audio signal driver
102. The transformer 109 converts an audio signal generated from the amplifier 108 into
positive and negative high voltage output signals So1 and So2 having equal intensities of two
types required by the flat panel type actuator speaker 101.
[0008]
However, the low bandwidth, high power transformer 109 needs to use a relatively large
inductor so that the overall speech frequency is not lost to the realism of speech reproduction. As
a result, the core becomes large and not only occupies a relatively large amount of space but also
becomes an expensive part. In other words, the actuator speaker 101 can not efficiently reduce
its volume and weight. Therefore, in the system of the actuator speaker, how to reduce the
volume and weight and save the consumption power of the actuator speaker becomes a problem
of extending the use time of the mobile type electronic product incorporating the actuator
speaker .
[0009]
An object of the present invention is to provide an audio signal driver of an actuator speaker that
reduces the volume and weight of the actuator speaker.
[0010]
Another object of the present invention is to provide an audio signal driver of an actuator
speaker capable of reducing power consumption of the actuator speaker and extending the usage
time of a mobile type electronic product incorporating the actuator speaker.
[0011]
そこで。
As a result of intensive studies conducted in view of the drawbacks of the prior art, the inventor
of the present invention is an actuator speaker audio signal driver including a perforated plate
electrode and a diaphragm and coupled to a flat panel type actuator speaker, A signal power
04-05-2019
3
amplifier for receiving an audio signal and producing a power amplification audio signal,
receiving the power amplification audio signal, converting the two into a high voltage output
signal with equal intensity, and outputting the signal to the porous plate electrode and the
diaphragm The present invention provides an audio signal amplifier transformer, and the audio
signal amplifier transformer solves the problem by an audio signal driver that efficiently forms a
low pass filter with the actuator speaker, and completes the present invention based on such
knowledge. I did.
[0012]
The present invention will be specifically described below.
The audio signal driver of the actuator speaker according to claim 1 comprises an apertured
plate electrode and a diaphragm, and is an audio signal driver coupled to the flat panel type
actuator speaker, wherein the audio signal is received and the power is received. A signal power
amplifier for converting into an amplified voice signal, The power amplified voice signal is
received, converted into two high voltage output signals, and a voice signal for outputting each of
the high voltage output signals to the porous plate electrode and the diaphragm An amplification
transformer, wherein the audio signal amplification transformer efficiently forms a low pass filter
with the actuator speaker.
[0013]
The audio signal driver of the actuator speaker according to claim 2 includes an AC-DC converter
or a DC-DC converter in which the audio signal driver in claim 1 outputs high voltage direct
current to the signal power amplifier.
[0014]
The audio signal driver of the actuator speaker according to claim 3 is a class AB amplifier or a
class D amplifier according to claim 1.
[0015]
The audio signal driver of the actuator speaker according to claim 4 is an audio signal according
to claim 1 generated and output by a mobile type multimedia device such as an MP3 player, a CD
player, or a smart type mobile phone. is there.
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4
[0016]
The sound signal driver of the actuator speaker according to claim 5 includes the film layer and
the electrode layer carrying a charge in the diaphragm according to claim 1.
[0017]
The audio signal driver of the actuator speaker according to claim 6 comprises a perforated plate
electrode and a diaphragm, and is an audio signal driver coupled to the flat panel type actuator
speaker, wherein the audio signal is received and the power is received. A signal power amplifier
for converting into an amplified voice signal, receiving the power amplified voice signal,
converting it into a high voltage output signal, and outputting the high voltage output signal to
the porous plate electrode, and the diaphragm being cupped to the ground end And a ring voice
signal amplification transformer, wherein the voice signal amplification transformer and the
actuator speaker efficiently form a low pass filter.
[0018]
The audio signal driver of the actuator speaker according to claim 7 includes an AC-DC converter
or a DC-DC converter, wherein the audio signal driver in claim 6 outputs a high voltage direct
current to the signal power amplifier.
[0019]
The audio signal driver of the actuator speaker according to claim 8 is a signal power amplifier
according to claim 6 which is a class AB amplifier or a class D amplifier.
[0020]
The audio signal driver of the actuator speaker according to claim 9 is an audio signal according
to claim 6 generated and output by a mobile type multimedia device such as an MP3 player, a CD
player, or a smart type mobile phone. is there.
[0021]
The sound signal driver of the actuator speaker according to claim 10, wherein the diaphragm in
claim 6 includes a film layer and an electrode layer carrying a charge.
[0022]
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5
It is explanatory drawing which showed the structure of the conventional flat panel type actuator
speaker.
It is explanatory drawing which showed the structure of the audio driver of the actuator speaker
by this invention.
It is explanatory drawing which showed the structure of the audio driver of the actuator speaker
by other embodiment.
[0023]
The present invention provides an audio signal driver for an actuator speaker that reduces the
volume and weight of the actuator speaker, and provides an audio signal driver for the actuator
speaker that can reduce the power consumption of the actuator speaker. The audio driver is an
audio signal driver of an actuator speaker that includes a perforated plate electrode and a
diaphragm and is coupled to a flat panel type actuator speaker, and is a signal that receives an
audio signal and performs a power amplification audio signal. A power amplifier, and an audio
signal amplification transformer for receiving the power amplification audio signal, converting it
into two equal high voltage output signals, and outputting the porous plate electrode and the
diaphragm to the audio signal amplification transformer; The amplification transformer is
Speakers and efficiently to form a low-pass filter.
In order to describe in detail the structure and features of the audio signal driver of such an
actuator speaker, a specific example is given and set up with reference to the drawings.
[0024]
FIG. 2 discloses a capacitor type, flat panel type actuator speaker 201 according to the
embodiment of the present invention, and an audio signal driver 202 coupled to the actuator
speaker 201.
[0025]
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The audio signal driver 202 includes a signal power amplifier 204 and an audio signal
amplification transformer 203, receives the audio signal Sin, and converts it into high-voltage
output signals So1 and So2 having equal two intensities.
The audio signal Sin is an audio signal generated and output by a mobile type multimedia device
such as an MP3 player, a CD player, or a smart type mobile phone, for example.
[0026]
The signal power amplifier 204 receives the high voltage DC current VDCH output from the high
voltage DC power supply 209 and amplifies the audio signal Sin to generate a power amplified
audio signal Sin '.
The high voltage DC power supply 209 is an AC-DC converter or a DC-DC converter.
The signal power amplifier 204 is a class AB or class D amplifier.
However, it does not restrict to these.
[0027]
The actuator speaker 201 includes a perforated plate electrode 205 and a diaphragm 210.
A plurality of holes 207 are formed in the porous plate electrode 205.
The diaphragm 210 includes a film layer 208 and a charged electrode layer 206.
The film layer 208 is made of, for example, polytetrafluoroethylene or a tetrafluoroethylenehexafluoropropylene copolymer. However, it does not restrict to these. The electrode layer 206 is
made of aluminum, chromium, or another conductive material. However, it does not restrict to
04-05-2019
7
these. Perforated plate electrode 205 and diaphragm 210 receive high voltage output signals So1
and So2, respectively.
[0028]
The actuator speaker 201 can be regarded as a capacitor. The capacitance value C can be
obtained by the following equation 1:
[0029]
[0030]
In Equation 1, ε 0 is the dielectric coefficient in vacuum, and ε γ is the relative dielectric
coefficient.
A represents the area of the diaphragm 210 and the porous plate electrode 205. d represents the
distance between the diaphragm 210 and the porous plate electrode 205.
[0031]
The audio signal Sin is amplified by N2 / N1 times by the audio signal amplification transformer
203 and then converted into high voltage output signals So1 and So2 to drive the actuator
speaker as disclosed in the following equation 2 or 2 Do.
[0032]
[0033]
[0034]
In the embodiment, the coil turns ratio N2 / N1 of the secondary side and the primary side of the
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audio signal amplification transformer 203 is 50 to 120.
In another embodiment, the coil on the secondary side or the primary side is an enameled wire of
0.12φ to 0.02φ.
[0035]
The flat panel type actuator speaker 201 which is a capacitor type can express the power
consumption Wc by the following equation 4.
[0036]
[0037]
Although there are not a few differences in the potential difference (S01-S02) <2> in the equation
(4), the capacitance value C of the actuator speaker 201 is extremely small (usually 20 pF to 20
nF).
Therefore, the power consumption ratio of the power consumption Wc of the actuator speaker
201 is μW class.
[0038]
The audio signal amplification transformer 203 efficiently forms a low pass filter with the
actuator speaker in addition to amplifying the input audio signal Sin by N2 / N1, and removes
high frequency signal components of the high voltage output signals So1 and So2.
Also, the audio signal amplification transformer 203 is modulated within the band of the
relatively high frequency audio signal Sin.
Therefore, it is not necessary to use a low frequency band high power transformer.
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9
A high center frequency, low cost transformer only has to be used, and the volume and weight of
the actuator speaker system can be reduced efficiently, and the power consumption of the
actuator speaker can be reduced, making it possible to use mobile type electronic products once.
It is possible to extend the use time by charging the battery.
[0039]
In an embodiment, the silicon steel plate of the audio signal amplification transformer 203 has
low frequency, directivity, high permeability.
[0040]
As another embodiment, the bobbin of the audio signal amplification transformer 203 is made of
a liquid crystal polymer and the pin is C-shaped to prevent the wire diameter of the primary side
and the secondary side from being too thin and disconnecting.
[0041]
A flat panel type actuator speaker according to a second embodiment is disclosed in FIG.
The audio signal driver 202 is coupled to a flat panel type actuator speaker 201 of a capacitor
type.
[0042]
The audio signal driver 202 includes a signal power amplifier 204 and an audio signal
amplification transformer 203, receives the audio signal Sin, and converts it into a high voltage
output signal So1.
The audio signal Sin is an audio signal generated and output by a mobile type multimedia device
such as an MP3 player, a CD player, or a smart type mobile phone, for example.
[0043]
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10
The signal power amplifier 204 receives the high voltage DC current VDCH output from the high
voltage DC power supply 209 and amplifies the audio signal Sin to generate a power amplified
audio signal Sin '. The high voltage DC power supply 209 is an AC-DC converter or a DC-DC
converter. The signal power amplifier 204 is a class AB or class D amplifier. However, it does not
restrict to these.
[0044]
The actuator speaker 201 includes a perforated plate electrode 205 and a diaphragm 210. A
plurality of holes 207 are formed in the porous plate electrode 205. The diaphragm 210 includes
a film layer 208 and a charged electrode layer 206. The film layer 208 is made of, for example,
polytetrafluoroethylene or a tetrafluoroethylene-hexafluoropropylene copolymer. However, it
does not restrict to these. The electrode layer 206 is made of aluminum, chromium, or another
conductive material. However, it does not restrict to these. The perforated plate electrode 205
and the diaphragm 210 receive the high voltage output signal So1. One end of the diaphragm
210 is grounded.
[0045]
The audio signal Sin is amplified to N2 / N1 times by the audio signal amplification transformer
203 and converted into a high voltage output signal So1 as disclosed in the following Equation 5
or Equation 6, and drives the actuator speaker.
[0046]
[0047]
[0048]
The flat panel type actuator speaker 201 which is a capacitor type can express the power
consumption Wc by the following equation 7.
[0049]
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11
[0050]
The coil turns ratio N2 / N1 of the secondary side and the primary side of the audio signal
amplification transformer 203 is 50 to 120.
Moreover, the coil of a secondary side or a primary side is an enameled wire of 0.12 (phi)-0.02
(phi).
[0051]
In the above equation (7), although there are not a few potential differences S01 <2>, the
capacitance value C of the actuator speaker 201 is extremely small (usually 20 pF to 20 nF).
Therefore, the power consumption ratio of the power consumption Wc of the actuator speaker
201 is μW class.
[0052]
The audio signal amplification transformer 203 efficiently forms a low pass filter with the
actuator speaker in addition to amplifying the input audio signal Sin by N2 / N1, and removes
the high frequency signal component of the high voltage output signal So1.
Also, the audio signal amplification transformer 203 is modulated within the band of the
relatively high frequency audio signal Sin.
Therefore, it is not necessary to use a low frequency band high power transformer.
A high center frequency, low cost transformer only has to be used, and the volume and weight of
the actuator speaker system can be reduced efficiently, and the power consumption of the
actuator speaker can be reduced, making it possible to use mobile type electronic products once.
04-05-2019
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It is possible to extend the use time by charging the battery.
[0053]
The silicon steel plate of the audio signal amplification transformer 203 has low frequency,
directivity, and high permeability.
[0054]
As another embodiment, the bobbin of the audio signal amplification transformer 203 is made of
a liquid crystal polymer and the pin is C-shaped to prevent the wire diameter of the primary side
and the secondary side from being too thin and disconnecting.
[0055]
The above is the preferred embodiments of the present invention and does not limit the scope of
implementation of the present invention.
Therefore, corrections, modifications, or partial transformations that can be done by those skilled
in the art, which are made under the spirit of the present invention and have equivalent effects
on the present invention, have a longitudinal format, structure, layout, etc. Any proportions,
materials, elements, components, or other changes are intended to be included within the scope
of the present invention.
[0056]
101 Actuator Speaker 102 Audio Signal Driver 104 Electrode 105 Film 106 Electrode 108
Amplifier 109 Transformer 107 High Voltage Direct Current 201 Actuator Speaker 202 Audio
Signal Driver 203 Audio Signal Amplifier Transformer 204 Signal Power Amplifier 205 Porous
Plate Electrode 206 Electrode Layer 207 Hole 208 Film Layer 209 High Voltage DC Power
Supply 210 Diaphragm
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