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JPS58106989

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DESCRIPTION JPS58106989
[0001]
The present invention relates to a control device for controlling the internal pressure of a
speaker device in which two phases of gas and liquid consisting of one component or 111 plural
components coexist in an enclosed cabinet. In recent audio equipment, a speaker device capable
of reproducing with high fidelity has been demanded, and a closed-type speaker device provided
with a flat diaphragm having excellent sound pressure frequency characteristics has attracted
attention. In the closed-type speaker device, the minimum resonance frequency fO which
determines the reduction limit is expressed by the following equation, where town is the stiffness
of the speaker, 4 is the stiffness of the medium yabinette, and M is the nine speaker vibration
system including the additional mass. It is mass. さらに8. Is represented by% B, -rPA '/ V. Here,
r is the specific heat ratio, P is the internal pressure of the cabinet, m is the opening area of the
speaker, and ■ is the volume of the cabinet. Finally, in the small small speaker device of ■ 8! As
a result, f0 becomes high, so that the bass can not be reproduced sufficiently. In fact, if you hold
the inside of the Yabinette in a state 11 in which two phases of gas and liquid consisting of one
or more components coexist, the apparent r is small, and as a result, S, small 1 kdP It can be used
as a bass and has an effect on bass reproduction. When carrying out this method, it is necessary
to control and maintain the temperature inside the cabinet so that the internal pressure of the
cabinet becomes equal to the external pressure. If there is a pressure difference between the
internal pressure of the cabinet and the external pressure, the position of the diaphragm can be
held at the correct position, which is a wheat. FIG. 1 shows a conventional closed speaker device.
In FIG. 5, 1 is a cabinet, 2 is a diaphragm of a speaker, 3 is a liquid, 4 is a temperature sensor, 5
is a heater, 6 is a control circuit, and the temperature sensor 4 detects the temperature inside the
cabinet 1 and outputs it. The control circuit 6 controls the heater 5. By the way, in this method,
since the temperature distribution inside the cabinet differs depending on the shape, size, etc. of
the cabinet, there is a problem in the mounting position of the temperature sensor, and there is a
07-05-2019
1
time lag between the temperature change and the pressure change. There are drawbacks such as
being slow. An object of the present invention is to provide a sealed speaker device provided with
a temperature (pressure) control device without the above-mentioned drawbacks. The present
invention relates to a speaker device in which two phases of gas and liquid consisting of one or
more components coexist in a closed cabinet to which a flat plate diaphragm is attached, a
pressure sensor for detecting the internal pressure of the closed cabinet, and a pressure sensor
And a temperature control device operated by the output of the control unit, wherein the internal
pressure of the closed cabinet is adjusted and held so as to be external to the external pressure.
The embodiment will be described below with reference to FIG. 1 is a vibrating plate of 2 y
speaker, 2 y speaker! The raw liquid 5 is a heater, 6 is a control circuit, and 7 is a pressure
sensor. The eleventh prior art device detects the temperature inside the cabinet by means of a
temperature sensor t4, and the control circuit 6 controls the heater 5 by its output. The internal
pressure is detected and the temperature control device, such as the control circuit 6 and the
control circuit 6, is operated by its output to control the internal temperature of the cabinet. The
internal temperature of the write closer is adjusted to equalize the pressure inside and outside
the cabinet. Since the internal temperature of the cabinet has been detected by the conventional
O temperature sensor, there is a failure as described above, and in the present invention, the
internal pressure of the pressure sensor is directly detected by the present invention. There is no
fault, that is, changes in pressure inside the cabinet uniformly propagate inside the cabinet, so
there is no limitation on the mounting position of the pressure sensor, and the pressure sensor
directly senses changes in pressure, so the response is quick. The pressure sensor 7 is a silicon
diaslam type or differential capacitance type pressure sensor. FIG. 3 shows an embodiment of the
invention of claim (2). In the present invention, displacement of the diaphragm due to changes in
the internal pressure or external pressure of the cabinet is detected by the displacement
detection sensor 8, and the temperature control device & (heater 5 and control circuit 6) is
operated by its output. The purpose is to prevent the displacement of the diaphragm in order to
equalize the pressure inside and outside of the ring mesh. Therefore, directly detecting the
displacement of the diaphragm is closer to the ultimate purpose of the present invention. The
displacement detection sensor is provided close to the diaphragm, and detects displacement of
the diaphragm based on the difference in pressure between the inside and the outside of the
cabinet. The diaphragm vibrates according to the input of the speaker, but it is easy to set the
displacement detection sensor 8 to detect only the displacement of the diaphragm. In the
embodiment shown in FIG. 3, sand is thrown close to the displacement detection sensor 8Fi
middle high-pitched diaphragm 21. This is because the diaphragm 2 'for middle and high-pitched
sound has a smaller diameter than the diaphragm 2 for low-pitched sound, the displacement
based on the difference in pressure inside and outside the cabinet is large, and detection is easy.
FIG. 4 is another embodiment of the invention described in the line (2). In this embodiment, the
displacement detection sensor 8 is provided outside the cabinet so that the vibration IIO
displacement can be detected without being affected by the atmosphere inside the IIP gap.
07-05-2019
2
As described above, the sealed speaker device according to the present invention directly detects
the internal pressure of the yavinet or the displacement of the diaphragm during sealing to
adjust the internal pressure of the cabinet. Since it is as above-mentioned that it is the glaze |
lean-whale adjustment | control system, it has an effect which achieves the intended purpose of
this invention described at the beginning.
[0002]
Brief description of the drawings
[0003]
FIG. 1: A diagram showing a conventional closed-type speaker device FIG. 2 a diagram showing
an embodiment of the invention described in claim (1) fs 3: diagram of the invention described in
claim (2) Figure showing an embodiment Figure 4: Diagram showing another embodiment of the
invention described in the claim (2) [symbol] a ... cabinet, 2.21 ... diaphragm, 5 ... · Liquid · 4 · · ·
Temperature sensor · 5 · · · · · · · · · · · · · · · · · · · · · Control circuit, 7 · · · pressure sensor, 8 · · ·
displacement detection sensor fan 1 icon 3 icon Figure 2 Figure 4
07-05-2019
3
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