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DESCRIPTION JPS5795794

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DESCRIPTION JPS5795794
Description 1, title of the invention
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DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microphone. In
conventional microphones, wind noise (noise caused by wind disturbance) and pop noise are
reduced by covering the windscreen on the front of the microphone. However, in this wind
screen, since the laminarization of the wind does not occur sufficiently, the wind noise can not be
completely eliminated, and the sensitivity is lowered. In addition, when a high wind speed flows
in, the wind screen itself tends to further increase, as a disturbance generated by the wind screen
itself occurs. In view of such problems, the applicant of the present application has proposed a
microphone which effectively removes the noise component of the wind from low speed to eddy
speed and extracts only the sound signal in Japanese Patent Application No. 54-145770. There
is. That is, in this microphone, a sensor for detecting the wind speed is provided in the vicinity of
the diaphragm, and the difference signal between the signal from the sensor and the signal from
the microphone body is output. By configuring the microphone as described above, only the
audio signal can be effectively output, but in the above microphone, the sensor is provided at a
predetermined distance from the diaphragm and in the vicinity thereof. As a result, the
manufacture of the support member of the sensor, the formation of the sensor, the attachment of
the sensor, etc. are more time-consuming than the manufacture of the conventional microphone
capsule. Also, since a tungsten wire with a diameter of about 5? is used as a sensor, mechanical
strength is not good, and there is a risk that it will be cut off by S shock force, so it is necessary
to handle it more carefully than conventional microphone Become. Further, in the abovementioned microphone, since the detection position of the voice and the detection position of the
wind are slightly separated, in the case of a high frequency wind, the phase difference becomes
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intermittent. The present invention has been made in consideration of the aforementioned
problem, and is a microphone provided with a sensor for detecting a wind speed and outputting a
difference signal between a signal from the sensor and a signal from the microphone body. The
present invention relates to a microphone characterized in that the sensor for detecting the flow
velocity is formed on a diaphragm of the microphone body. According to this structure,
manufacturing is easy, mechanical strength is strong, there is no influence of phase difference,
and noise components of wind from low speed to high speed are effectively removed to extract
only an audio signal as an output. be able to. Hereinafter, an embodiment of the present
invention will be described with reference to the drawings.
FIG. 1 is a book showing a specific configuration of a condenser type microphone according to an
embodiment of the present invention. In this microphone 0, a diaphragm (2) is directly provided
on the upper surface of the back electrode (1). It is necessary that the diaphragm (2) is not
softened to a certain temperature on its surface, and it is preferable that the diaphragm be
formed of polyethylene terephthalate, tetrafluoroethylene, tetrafluoropropylene,
polyvinyldifluoroethylene, polyimide or the like. . On the upper surface of the diaphragm (2), as
shown in FIGS. 2A and 2B, a sensor (3) for detecting the flow velocity is formed extending in the
diametrical direction. Lubricating electrodes (4) are formed on both ends of the sensor (3) by
methods such as adhesion and vapor deposition. A conductive metal substance such as Ag, kg%
fJ, stainless steel or the like is vapor-deposited on the lower surface of the diaphragm (2) to
constitute an electrode plate (5) of the capacitor. The above-described back electrode (1) is
disposed below the l # L pole plate (5). The outer peripheral portion of the back electrode (1) is
coupled to the insulating support member (6), and the back electrode (1) is fixedly supported by
the support member (6). Furthermore, the casing of this microphone unit is constituted by a
conductive cylindrical member (7) which doubles as a terminal, the outside of which is covered
with a microphone case not shown, and the upper surface opening of this casing (7) has a grid
shape The windscreen (8) is arranged. An annular projection (9) is formed on the insulating
support member (6) in order to widen the area of tension, and the diaphragm (2) is tensioned
close to its elasticity ta. Diaphragm + 2) I / i is fixed through insulating ring and diaphragm ring I,
and spacer llz is inserted between diaphragm ring 1 and insulating support # (6) . On the lower
side of the back electrode (1), a sound wave resistor u3 made of paper (Pavilon) or the like and
an interposing property adjusting plate (141) are provided, which are fixed in the microboa /
unit by ? cell lock ring 4. Alternatively, instead of using the insulating member (6) as a member
that applies tension to the diaphragm (2), the surface of the sensor (3) and the electrode (4) may
be coated with a quartz film. Then good insulation is obtained. The back electrode (1) can be
directly contacted to the diaphragm (2), and the thermal conductivity can be improved. Further,
coating of A420 g (alumina) on the quartz film makes it possible to prevent oxidation. Next, the
principle of the microphone according to the embodiment will be described with reference to FIG.
6 and FIG.
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As shown in FIG. 6, the signal from the sensor (3) for detecting the wind speed formed on the
diaphragm of the microphone body is supplied to a synthesizing circuit ? ?? of both signals.
The configuration of this circuit is shown in FIG. 4, but the microphone unit afJ is connected to
the differential amplifier portion 10 through the preamplifier a, and the sensor (3) has a front
wLNI width. (1) is connected to one terminal of the differential amplifier -1. In addition, it is
desirable to connect a pre-amplification @ (7) with an equalizer so as to improve the linearity of
the glow discharge characteristics. Such a capacitor-type microphone forms a capacitor with the
diaphragm (2) and the fixed electrode (1), and loses the electromotive force using the change in
electric capacity due to the vibration of the diaphragm (2). In such a condenser type microphone,
not only the target voice from the front of the microphone but also the wind caused by the gust,
etc., the microphone body ?e has noise due to the wind as well as the voice. When it is input,
EndPage: 2 etc. are pre-amplified and then enter the differential amplifier section. On the other
hand, a wind pressure acts on the sensor (3) simultaneously with the microphone body ?Q, and
the pressure in the air due to the wind pressure is worked out, and it is pre-amplified before
entering the differential amplifier. Therefore, in the differential amplifier ? field, both the voice
and wind noise signals from the microphone body ae are supplied to ten terminals, and the wind
noise only signal from the sensor (3) is supplied to one terminal, The differential amplifier 0
cancels the wind noise signal of the microphone body uQ and the wind noise signal of the sensor
(3). As a result, only the target audio signal is taken out of the differential amplifier (l ? and
supplied to the circuit of the next stage. In the microphone of this embodiment, a metal such as
tungsten or platinum is directly attached to the surface of the diaphragm of the microphone body
by a method such as vacuum evaporation or sputtering as the flow rate detection sensor (3).
Then, in order to remove wind noise effectively, the sensor (3) is preheated to about 400 ░ C.,
and the current flowing through the sensor (3) by the cooling action of the sensor (3) is the wind
speed Change accordingly. In this case, by incorporating the sensor (3) as one of the resistances
of the Wheatstone bridge, the above current fluctuation component is outputted as a voltage
change, and this voltage fluctuation component is outputted as a differential amplifier (L old It
goes on to be able to supply this. For this purpose, the voltage fluctuation from the Wheatstone
bridge is fed back to the sensor (3) side as xft to maintain the equilibrium state of the
Wheatstone bridge.
The sensor (3) is desirably disposed on the diameter of the diaphragm (2) of the hood
microphone body member in order to exert the above-described effect. This is because the
displacement of the diaphragm (2) becomes larger at such a position, and the wind noise applied
to the sensor (3) and the wind noise applied to the diaphragm (2) are equally input. . The
temperature characteristics of the sensor (3) may be either positive or negative, and materials
such as tanges f ? ?: y, platinum, etc. can be used, but tungsten is desirable in that
contamination in the air during heating is difficult to adhere . Although such a condenser
microphone is particularly vulnerable to wind noise, the sensor (3) can completely eliminate the
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defect. In addition, since the above-mentioned amplifier and linearizer, etc., including the sensor
(3), are compact and integration of circuits is possible, they can be built in the microphone couss,
and therefore a compact and compact microphone can be obtained. Can be provided.
Furthermore, since the sensor (3) is directly attached to the diaphragm by vacuum evaporation
or sputtering, it is easier than manufacturing or hot-wire type and can reduce manufacturing
cost. Also, the mechanical strength is stronger than that of the hot wire type, and there is no fear
of disconnection. Furthermore, since the detection positions of the voice and the wind are
substantially the same, there is an advantage that the influence of the phase difference
disappears. Although the embodiment of the present invention has been described above, this
embodiment can be further modified based on the technical idea of the present invention. For
example, although FIGS. 5A and 5B show a modification of the shape of the sensor, as shown in
FIG. 5A, the diaphragm C! The sensor (2) may be provided on the crucible in the form of a loop or
a hook so that the pair of electrodes (along the diametrical direction of the diaphragm (2) may be
configured). This configuration has the advantage of being able to reduce the influence of partial
uneven distribution of the wind speed on the diaphragm 3I). Also, as shown in FIG. 5B, the sensor
(c) and the-pole (d) may be formed on the diaphragm (d). With such a configuration, the sensor
(2) can be lengthened, so that the sensitivity of the sensor (c) can be improved. Incidentally, the
change of the shape of the seventh dimension can be easily achieved by changing the shape of
the hole of the mask in the case of vacuum deposition. In the present invention, as described
above, the sensor for detecting the wind speed is provided on the diaphragm and the difference
signal between the signal of the sensor and the signal of the microphone body is obtained.
Therefore, the wind noise and the pop noise are accurately and sufficiently removed. obtain.
Moreover, since the sensor is provided directly on the diaphragm, only the audio signal can be
output without the influence of the phase difference, and furthermore, the irr line of the sensor is
reduced.
In addition, since the attachment of the sensor is not required, the manufacture is facilitated and
the cost is also improved.
??? Brief Description of the Drawings FIG. 1 shows an actual IMf 1 of the present invention,
wherein EndPage: 31 is a cross-sectional view of an example of a specific configuration of a
condenser microphone, and FIG. 2A is a plane of the diaphragm of FIG. Fig. 2B is a cross-sectional
view taken along line 2B-2B 'of Fig. 2A, Fig. 6 is a block diagram of the microphone, Fig. 4 is a
circuit diagram of a combining circuit of two signals, Fig. 5A and 5B are A plan view of a
diaphragm for showing a modification of the sensor: In the reference numerals used in the
drawings, (2)... Surface иииииииииииииииииииииииииииииииииииииии Microphone body 4 иииииии иииииииии A differential amplifier.
Agent Associate Katsuya I Matsuda Osamu Fig. 1 Fig. 2A-L-28 'EndPage: ?
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