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JP2008118512

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DESCRIPTION JP2008118512
An object of the present invention is to provide a speaker capable of reducing the influence of
sound pressure due to humidity and maintaining a constant sound pressure regardless of
humidity without increasing the number of processing steps. The control unit (40) controls so
that a bias voltage applied to the diaphragm (14) is complemented when the insulation resistance
between the electrode plate (11) and the electrode plate (12) and the diaphragm (14) decreases
with an increase in humidity. . That is, even if the insulation resistance between the electrode
plate 11 and the electrode plate 12 and the diaphragm 14 changes due to a change in humidity
around the speaker 10, the control unit 40 maintains the bias voltage applied to the diaphragm
14 constant. Do. Thereby, even if the humidity changes, the change in the sound pressure of the
sound generated from the speaker 10 is reduced. [Selected figure] Figure 1
スピーカ
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a
speaker, and more particularly to a speaker that reduces a decrease in sound pressure due to a
change in humidity.
[0002]
Conventionally, as disclosed in Patent Document 1, an electrostatic speaker is widely proposed.
04-05-2019
1
Such an electrostatic speaker includes a pair of electrode plates and a diaphragm sandwiched
between the electrode plates. By supplying a signal to the pair of electrode plates while applying
a bias voltage to the diaphragm, the coulomb force between the diaphragm and the electrode
plate changes. As a result, the diaphragm vibrates and a sound is generated. In such an
electrostatic speaker, the sound pressure changes due to the change of the coulomb force
between the diaphragm and the electrode plate.
[0003]
The moisture contained in the air, that is, the humidity, changes every season or time. While air
has relatively high insulation, water has relatively low insulation. Therefore, as the amount of
moisture contained in the air increases, that is, the humidity increases, the insulation of air
decreases. As a result, the humidity around the speaker causes a change in the insulation
resistance between the diaphragm and the electrode plate and the coulomb force, and for
example, there is a problem that the ambient humidity such as a change in weather causes a
change in the volume generated from the speaker. is there.
[0004]
Therefore, as in the invention disclosed in Patent Document 1, for example, it is considered to
provide a water repellent water-repellent layer on the opposite side of the electrode plate to the
diaphragm. However, since the water repellent layer needs to emit the sound generated by the
vibration of the diaphragm, the air permeability must be ensured. Therefore, there is a problem
that it is difficult to ensure the air permeability when forming the water repellent layer and to
control the predetermined air permeability.
[0005]
JP, 2006-148612, A
[0006]
Therefore, an object of the present invention is to provide a speaker that reduces the influence of
sound pressure due to humidity and maintains a constant sound pressure regardless of humidity
without increasing the number of processing steps.
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2
[0007]
(1) According to the present invention, a pair of electrode plates disposed opposite to each other,
a diaphragm interposed between the pair of electrode plates to form a predetermined distance
with the electrode plate, and ambient humidity Control means for controlling the bias voltage
applied to the diaphragm in a constant manner in accordance with the above.
The control means controls the bias voltage applied to the diaphragm constant even if the
ambient humidity changes.
Thus, for example, even if the insulation resistance between the diaphragm and the electrode
plate decreases with the increase in humidity, the control means controls the bias voltage applied
to the diaphragm to a constant level, and between the diaphragm and the electrode plate The
potential difference of is maintained constant. Further, in order to control the bias voltage of the
diaphragm, the diaphragm and the electrode plate do not need to be processed for reducing the
humidity. Therefore, a change in sound pressure due to humidity is reduced without causing an
increase in the number of processing steps, and a constant sound pressure can be maintained
regardless of the humidity.
[0008]
(2) In the present invention, the control means varies the voltage applied to the diaphragm and
maintains the bias voltage constant. The control means changes the voltage applied to the
diaphragm when the potential difference between the diaphragm and the electrode plate
changes. For example, when the potential difference between the diaphragm and the electrode
plate decreases due to the increase in humidity, the voltage applied to the diaphragm is
increased. Thereby, the bias voltage applied to the diaphragm is maintained constant. Therefore,
the change of the sound pressure due to the humidity is reduced, and the constant sound
pressure can be maintained regardless of the humidity.
[0009]
(3) In the present invention, the control means sets the bias voltage from the potential difference
between the electrode plate and the diaphragm. The control means detects a potential difference
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between the diaphragm and the electrode plate. Then, the control means sets a bias voltage to be
applied to the diaphragm so that the detected potential difference between the diaphragm and
the electrode plate becomes constant. Therefore, the change of the sound pressure due to the
humidity is reduced, and the constant sound pressure can be maintained regardless of the
humidity.
[0010]
(4) In the present invention, a humidity detection means for detecting ambient humidity is
provided, and the control means sets a bias voltage to be applied to the diaphragm based on the
humidity detected by the humidity detection means. The control means detects the ambient
humidity by means of the humidity detection means. Then, the control means sets a bias voltage
to be applied to the diaphragm from the detected humidity. For example, the control means has a
relationship between humidity and a bias voltage applied to the diaphragm as a map. Thereby,
the control means sets the bias voltage according to the detected humidity. Therefore, the change
of the sound pressure due to the humidity is reduced, and the constant sound pressure can be
maintained regardless of the humidity.
[0011]
(5) According to the present invention, a pair of electrode plates disposed opposite to each other,
and a diaphragm interposed between the pair of electrode plates to form a predetermined
distance with the electrode plate, and the surrounding humidity And temperature control means
for controlling the temperature of the electrode plate and the diaphragm so that the bias voltage
applied to the diaphragm becomes constant accordingly. The temperature control means controls
the temperature of the electrode plate and the diaphragm when the ambient humidity changes.
By controlling the temperature of the electrode plate and the diaphragm, the temperature of air
existing between the electrode plate and the diaphragm changes. Humidity changes with the
temperature of air. Therefore, by changing the temperature of the air present between the
electrode plate and the diaphragm, the humidity of the air also changes, and the insulation
resistance between the electrode plate and the diaphragm also changes. For example, when the
humidity rises, the temperature control means heats the electrode plate and the diaphragm. As a
result, the temperature of the air existing between the electrode plate and the diaphragm
increases and the humidity decreases. The temperature control means controls the temperature
of the electrode plate and the diaphragm in this manner to control the humidity of the air
existing between the electrode plate and the diaphragm and control the bias voltage applied to
the diaphragm to a constant level. . Further, since the temperature control means controls the
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temperatures of the electrode plate and the diaphragm, the diaphragm and the electrode plate do
not need to be processed to reduce the humidity. Therefore, a change in sound pressure due to
humidity is reduced without causing an increase in the number of processing steps, and a
constant sound pressure can be maintained regardless of the humidity.
[0012]
(6) In the present invention, the temperature detection means for detecting ambient humidity is
provided, and the temperature control means sets the temperatures of the electrode plate and
the diaphragm based on the humidity detected by the humidity detection means. The
temperature control means detects the ambient humidity by the humidity detection means. Then,
the temperature control means sets the temperatures of the electrode plate and the diaphragm
from the detected humidity. For example, the temperature control means has, as a map, the
relationship between the humidity and the temperatures of the electrode plate and the
diaphragm. Thus, the control means sets the temperatures of the electrode plate and the
diaphragm in accordance with the detected humidity. Therefore, the change of the sound
pressure due to the humidity is reduced, and the constant sound pressure can be maintained
regardless of the humidity.
[0013]
(7) In the present invention, it further includes a spacer which is provided between the electrode
plate and the vibrating plate and supports the electrode plate and the vibrating plate at a
predetermined interval. By providing the spacer, although the effect of holding the center of the
diaphragm is obtained, the influence of the ambient humidity on the insulation resistance
between the electrode plate and the diaphragm becomes large. This is because when the spacer
is provided, water molecules captured by the spacer increase as the humidity increases, and the
conductivity between the electrode plate and the diaphragm increases. In the present invention,
in order to control the bias voltage applied to the diaphragm, the influence of humidity is
reduced even when the spacer is provided. Therefore, it is possible to reduce a change in sound
pressure due to humidity and maintain a constant sound pressure while maintaining an increase
in sound pressure due to the spacer.
[0014]
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5
Hereinafter, a plurality of embodiments of a loudspeaker according to the present invention will
be described in detail based on the drawings. In addition, the same code | symbol is attached |
subjected to a substantially identical component in several embodiment, and description is
abbreviate | omitted. First Embodiment A loudspeaker according to a first embodiment of the
present invention is shown in FIG. FIG. 1A is a cross-sectional view showing an outline of a main
part of the speaker according to the first embodiment, and FIG. 1B is a view as seen from the
arrow B direction of FIG.
[0015]
The speaker 10 includes an electrode plate 11 and an electrode plate 12. The electrode plate 11
and the electrode plate 12 are disposed to face each other substantially in parallel. Thereby, the
electrode plate 11 and the electrode plate 12 form a pair of electrodes. The electrode plate 11
and the electrode plate 12 are formed of, for example, a conductive material such as metal.
Further, the electrode plate 11 and the electrode plate 12 may be formed by forming a
conductive film on the surface of a sheet made of resin. The electrode plate 11 and the electrode
plate 12 are set to a thickness of about several millimeters. In addition, in FIG. 1, the thickness of
each part including the electrode plate 11 and the electrode plate 12 is expanded and shown for
the simplification of description.
[0016]
The electrode plate 11 and the electrode plate 12 have an opening 13. The opening 13 is formed
penetrating the electrode plate 11 and the electrode plate 12 in the plate thickness direction. The
hole area ratio of the electrode plate 11 and the electrode plate 12 can be set arbitrarily, but is
preferably set to 40% to 60%. The openings 13 can be arbitrarily disposed in the electrode plate
11 and the electrode plate 12. The opening 13 may be provided in both the electrode plate 11
and the electrode plate 12 as in the present embodiment, or may be provided in any one of the
electrode plate 11 and the electrode plate 12. Further, the mesh is not limited to the electrode
plate 11 and the electrode plate 12 in which the opening 13 is formed, and for example, a meshlike electrode plate may be used to use the mesh as the opening.
[0017]
A diaphragm 14 is sandwiched between the pair of electrode plates 11 and 12. The diaphragm
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14 is obtained by forming a conductive film on the surface of a resin film such as PET
(polyethylene terephthalate). As the conductive film, for example, a vapor-deposited film of metal,
or one coated with carbon particles can be used. The film forming the diaphragm 14 is set to a
thickness of about several μm.
[0018]
Frame members 15 are provided between the electrode plate 11 and the diaphragm 14 and
between the electrode plate 12 and the diaphragm 14, respectively. The frame member 15
supports the electrode plate 11, the electrode plate 12, and the diaphragm 14 at predetermined
intervals. The frame member 15 is formed of, for example, a resin such as vinyl chloride. When
the electrode plate 11, the electrode plate 12, the diaphragm 14, and the frame member 15 are
assembled, the speaker 10 is formed in a thin plate shape having a thickness of several mm to
several tens mm.
[0019]
A predetermined space 21 is formed between the electrode plate 11 and the diaphragm 14 by
the frame member 15. Similarly, a predetermined space 22 is formed between the electrode plate
12 and the diaphragm 14 by the frame member 15. A spacer 31 and a spacer 32 are provided in
the space 21 and the space 22, respectively. The spacer 31 is provided in the space 21 between
the electrode plate 11 and the diaphragm 14 and maintains a constant distance between the
electrode plate 11 and the diaphragm 14. Similarly, the spacer 32 is provided in the space 22
between the electrode plate 12 and the diaphragm 14 and maintains the distance between the
electrode plate 12 and the diaphragm 14 constant. Both the spacer 31 and the spacer 32 are
formed of a flexible, elastic, and breathable material. The spacer 31 and the spacer 32 are formed
of, for example, non-woven fabric of PET resin or foamed resin.
[0020]
The speaker 10 includes a step-up transformer 16, a power amplifier 17, and a control unit 40 as
control means. The electrode plate 11 and the electrode plate 12 are electrically connected to the
step-up transformer 16, respectively. Further, a bias voltage of several kV is applied to the
diaphragm 14 from the step-up transformer 16. A voltage whose polarity is reversed is applied
from the step-up transformer 16 to the electrode plate 11 and the electrode plate 12. Thereby,
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the coulomb force between the electrode plate 11 and the electrode plate 12 and the diaphragm
14 is changed by outputting an electric signal corresponding to the audio signal from the power
amplifier 17 to the electrode plate 11 and the electrode plate 12, and the diaphragm 14 vibrates.
The sound generated by the vibration of the diaphragm 14 is emitted to the outside through the
electrode plate 11 and the opening 13 of the electrode plate 12.
[0021]
The control unit 40 includes a bias voltage measuring unit 41, a reference voltage generator 42,
a subtractor 43, and an electronic volume 44, as shown in FIG. The configuration of the control
unit 40 shown in FIG. 2 is an example, and can be arbitrarily changed. The bias voltage
measurement unit 41 measures a bias voltage applied to the diaphragm 14. The bias voltage
measurement unit 41 detects a potential difference between the diaphragm 14 and the electrode
plate 11 or 12. The reference voltage generator 42 sets a reference value of the bias voltage. The
subtractor 43 calculates the difference between the potential difference detected by the bias
voltage measurement unit 41 and the reference value set by the reference voltage generator 42.
In the electronic volume 44, an output signal to be output to the power amplifier 17 is adjusted
from the difference calculated by the subtractor 43 and the input audio signal.
[0022]
Next, the operation of the speaker 10 configured as described above will be described. The
insulation resistance between the electrode plate 11 and the electrode plate 12 and the
diaphragm 14 changes with the humidity around the speaker 10 as shown in FIG. That is, the
insulation resistance decreases as the humidity around the speaker 10 rises. This is because
water has high conductivity compared to air, and when the humidity rises, water molecules in the
air existing between the electrode plate 11 and the electrode plate 12 and the diaphragm 14
increase, and the water molecules It is considered that the insulation resistance is lowered. When
the insulation resistance is reduced, the potential difference between the electrode plate 11 and
the electrode plate 12 and the diaphragm 14 is reduced, and the bias voltage of the diaphragm
14 is reduced. As a result, the vibration of the diaphragm 14 is reduced, and the sound pressure
of the sound generated by the vibration of the diaphragm 14 is reduced.
[0023]
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Further, when the spacers 31 and 32 are provided between the electrode plate 11 and the
electrode plate 12 and the diaphragm 14 as in the present embodiment, the change in the
insulation resistance with respect to humidity becomes more remarkable. This is because the
spacer 31 and the spacer 32 are formed of a porous material such as a non-woven fabric, and
therefore, when the humidity around the speaker 10 rises, water molecules contained in the air
that has entered the spacer 31 and the spacer 32 side are the spacer 31 And because it is
captured by the spacer 32. As shown in FIG. 3, the weight per unit thickness is as small as 5.0 g /
mm, that is, when the spacer having a small density is provided, and the weight per unit
thickness is as large as 24.0 g / mm, that is, the density is large. As compared with the case
where the spacers are provided, the spacers with smaller density are less susceptible to humidity.
This is considered to be because, as described above, the water molecules in the air are trapped
by the spacers 31 and the spacers 32, so that the captured water molecules increase as the
density of the spacers 31 and the spacers 32 increases.
[0024]
As shown in FIG. 3, the insulation resistance between the electrode plate 11 and the electrode
plate 12 and the diaphragm 14 changes depending on the humidity around the speaker 10
regardless of the presence or absence of the spacers 31 and 32. Further, by providing the spacer
31 and the spacer 31, the influence of the humidity on the insulation resistance becomes more
remarkable. Therefore, the bias voltage applied to the diaphragm 14 changes with the humidity
around the speaker 10.
[0025]
In the first embodiment, the bias voltage measurement unit 41 of the control unit 40 detects the
bias voltage applied to the diaphragm 14. The bias voltage measurement unit 41 measures the
bias voltage applied to the diaphragm 14 from the potential difference between the diaphragm
14 and the electrode plate 11 or 12 as described above. Based on the difference between the bias
voltage measured by the bias voltage measurement unit 41 and the reference value generated by
the reference voltage generator 42, the output signal output from the electronic volume 44 to
the power amplifier 17 is adjusted.
[0026]
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For example, the bias voltage set in the diaphragm 14 in the dry state is 5 kV, and the output
value output from the bias voltage measurement unit 41 is set at 5 V when the bias voltage is 5
kV. Further, the reference voltage generated from the reference voltage generator 42 is 5V.
Therefore, in the dry state, the subtraction value calculated by the subtractor 43 is “0”.
Therefore, the adjustment value of the electronic volume 44 is set to the middle point, ie, "± 0."
As a result, the output signal output to the power amplifier 17 is an uncorrected normal value,
and the speaker 10 generates a sound with normal sound pressure.
[0027]
When the humidity increases and the insulation resistance between the electrode plate 11 and
the electrode plate 12 and the diaphragm 14 decreases, the output value from the bias voltage
measurement unit 41 also decreases as the bias voltage decreases. At this time, when the output
value from the bias voltage measurement unit 41 is 3 V, the subtraction value calculated by the
subtractor 43 is 2 V. Therefore, the adjustment value of the electronic volume 44 is set to "+2 V".
As a result, the output signal output to the power amplifier 17 is a corrected correction value,
and the speaker 10 generates a normal sound pressure sound complementing the decrease in
sound pressure.
[0028]
As described above, in the first embodiment, when there is a possibility that a change occurs in
the bias voltage applied to the diaphragm 14, the control unit 40 controls the voltage so as to
complement the lowered bias voltage. Therefore, even if the humidity changes, the bias voltage
applied to the diaphragm 14 is maintained constant. Therefore, the change of the sound pressure
due to the humidity is reduced, and the constant sound pressure can be maintained regardless of
the humidity. Further, in the first embodiment, the electrode plates 11 and 12 and the diaphragm
14 of the speaker 10 do not need to be processed to reduce the humidity. Therefore,
complication of the structure of the electrode plates 11 and 12 and the diaphragm 14 and an
increase in the number of processing steps can be suppressed.
[0029]
Second Embodiment A control unit of a loudspeaker according to a second embodiment of the
present invention is shown in FIG. In the case of the second embodiment, the control unit 40 has
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10
a sound pressure measurement unit 45. The sound pressure measurement unit 45 is provided
instead of the bias voltage measurement unit 41 of the first embodiment. The sound pressure
measurement unit 45 measures the sound pressure of the sound emitted from the speaker 10.
The sound pressure measurement unit 45 changes the voltage of the output value according to
the measured average sound pressure. When the humidity around the speaker 10 rises, the
sound pressure of the sound generated from the speaker 10 decreases with the decrease in the
insulation resistance between the electrode plate 11 and the electrode plate 12 and the
diaphragm 14 as described above. Therefore, in the second embodiment, the sound pressure of
the sound generated from the speaker 10 is measured by the sound pressure measurement unit
45, and the bias voltage applied to the diaphragm 14 is adjusted based on the measured sound
pressure.
[0030]
For example, when the humidity increases and the insulation resistance between the electrode
plates 11 and 12 and the diaphragm 14 decreases, the sound pressure of the generated sound
decreases, and the output value from the sound pressure measurement unit 45 also decreases.
Therefore, the adjustment value of the electronic volume 44 is set based on the subtraction value
calculated by the subtractor 43. As a result, the output signal output to the power amplifier 17 is
a corrected correction value, and the speaker 10 generates a normal sound pressure sound
complementing the decrease in sound pressure.
[0031]
In the second embodiment, the bias voltage is adjusted according to the sound pressure of the
sound generated from the speaker 10 as in the first embodiment. Therefore, even if the humidity
changes, the bias voltage applied to the diaphragm 14 is maintained constant. Therefore, the
change of the sound pressure due to the humidity is reduced, and the constant sound pressure
can be maintained regardless of the humidity.
[0032]
Third Embodiment A control unit of a loudspeaker according to a third embodiment of the
present invention is shown in FIG. In the third embodiment, the control unit 50 is configured by a
microcomputer having a CPU 51, a ROM 52, and a RAM 53. The control unit 50 includes a
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11
control signal generation unit 54 in addition to the CPU 51, the ROM 52, and the RAM 53. In
addition, a humidity sensor 55 as a humidity detection unit is connected to the control unit 50.
The humidity sensor 55 outputs an electrical signal based on the detected humidity around the
speaker 10 to the control unit 50. In the ROM 52 of the control unit 50, the relationship between
the humidity detected by the humidity sensor 55 and the output value of the control signal
generated by the control signal generation unit 54 is stored as a map. Therefore, the control unit
50 sets the output value of the control signal based on the humidity detected by the humidity
sensor 55, and outputs the control signal from the control signal generation unit 54 to the power
amplifier 17. The control signal generation unit 54 generates a control signal for maintaining a
constant bias voltage of the diaphragm 14 that changes according to the humidity.
[0033]
In the third embodiment, the bias voltage applied to the diaphragm 14 is controlled in
accordance with the humidity around the speaker 10 detected by the humidity sensor 55.
Therefore, even if the humidity changes, the bias voltage applied to the diaphragm 14 is
maintained constant. Therefore, the change of the sound pressure due to the humidity is reduced,
and the constant sound pressure can be maintained regardless of the humidity.
[0034]
Fourth Embodiment A loudspeaker according to a fourth embodiment of the present invention is
shown in FIG. 6, and a heating control unit of the loudspeaker according to the fourth
embodiment is shown in FIG. In the fourth embodiment, the speaker 10 has a heating control
unit 60 and a heater 70 in addition to the configuration of the first embodiment. The heating
control unit 60 and the heater 70 constitute temperature control means in the claims. The
heating control unit 60 has a bias voltage measurement unit 61, a reference voltage generator
62, a subtractor 63, and a heater control unit 64, as shown in FIG. The bias voltage measurement
unit 61, the reference voltage generator 62, and the subtracter 63 are the same as in the first
embodiment. In the fourth embodiment, the heating control unit 60 does not correct the sound
signal. Therefore, the audio signal is directly input to the power amplifier 17.
[0035]
The heating control unit 60 turns on and off the heater 70. The heater 70 heats the electrode
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12
plate 11, the electrode plate 12, the diaphragm 14, the spacer 31 and the spacer 32 which
constitute the speaker 10. The heater control unit 64 interrupts the energization of the heater 70
based on the bias voltage of the diaphragm 14 measured by the bias voltage measurement unit
61. For example, the heater control unit 64 applies power to the heater 70 until the difference
between the output value from the bias voltage measurement unit 61 calculated by the
subtractor 63 and the reference value from the reference voltage generator 62 becomes “0”.
continue.
[0036]
Humidity changes with the temperature of air. That is, if the amount of water vapor contained in
the air is constant, the humidity decreases as the temperature rises. Therefore, in the fourth
embodiment, if there is a possibility that the humidity increases and the bias voltage applied to
the diaphragm 14 changes, the heating control unit 60 energizes the heater 70. By energizing
the heater 70, the temperature of the electrode plate 11, the electrode plate 12, the diaphragm
14, the spacer 31, and the spacer 32 is increased, and the humidity in the vicinity thereof is
decreased. Further, by heating the spacers 31 and 32, the moisture trapped by the spacers 31
and 32 evaporates. Thereby, the humidity in the vicinity of the speaker 10 is reduced, and the
bias voltage applied to the diaphragm 14 is maintained constant.
[0037]
In the fourth embodiment, when the insulation resistance between the electrode plates 11 and
12 and the diaphragm 14 decreases with the increase in humidity, the heating control unit 60
energizes the heater 70, and the electrode plate 11, the electrode plate 12, The diaphragm 14,
the spacer 31, and the spacer 32 are heated. Therefore, even if the humidity changes, the bias
voltage applied to the diaphragm 14 is maintained constant. Therefore, the change of the sound
pressure due to the humidity is reduced, and the constant sound pressure can be maintained
regardless of the humidity.
[0038]
Other Embodiments In the fourth embodiment described above, the configuration in which the
heater 70 is controlled while detecting the bias voltage of the diaphragm 14 has been described.
However, for example, a heating control unit including a humidity sensor and a microcomputer
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13
may be provided, and the heating control unit may control the heater 70 in accordance with the
output value from the humidity sensor. Further, instead of the heater 70, for example, a
temperature control unit capable of cooling and heating a Peltier element or the like is provided,
and cooling may be performed instead of heating in order to make the bias voltage constant.
[0039]
In the plurality of embodiments described above, each embodiment has been described
individually, but a plurality of embodiments may be combined and applied. Further, in the abovedescribed plurality of embodiments, the example in which the spacer 31 and the spacer 32 are
provided between the electrode plate 11 and the electrode plate 12 and the diaphragm 14 has
been described. However, the spacers 31 and 32 may be removed as needed.
[0040]
BRIEF DESCRIPTION OF THE DRAWINGS (A) is sectional drawing which shows the outline of a
structure of the speaker by 1st Embodiment of this invention, (B) is the arrow line view seen from
the arrow B direction of (A). FIG. 2 is a block diagram showing a configuration of a control unit of
the speaker according to the first embodiment of the present invention. Schematic which shows
the relationship between humidity and insulation resistance. The block diagram which shows the
structure of the control part of the speaker by 2nd Embodiment of this invention. The block
diagram which shows the structure of the control part of the speaker by 3rd Embodiment of this
invention. The block diagram which shows the outline of a structure of the speaker by 4th
Embodiment of this invention. The block diagram which shows the structure of the control part
of the speaker by 4th Embodiment of this invention.
Explanation of sign
[0041]
10: Speaker, 11: electrode plate, 12: electrode plate, 14: diaphragm, 31, 32: spacer, 40, 50:
control unit (control means), 55: humidity sensor (humidity detection means), 60: heating control
Unit (temperature control means), 70: heater (temperature control means)
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