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JPS6054595

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DESCRIPTION JPS6054595
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
support structure for a vibration-proof microphone, and more particularly to a support structure
for a vibration-proof microphone that improves sensitivity frequency characteristics of the
microphone by improving the support structure for a microphone unit for vibration pickup. .
BACKGROUND OF THE INVENTION Conventionally, as shown in FIG. 1, the output of the sound
receiving microphone unit 1 and the output of the vibration pickup microphone unit 2 housed in
the housing 6 and cut off from the external space are , There is an anti-vibration microphone 10
that combines in a reverse phase by the subtractor 30 to reduce mechanical vibration noise
transmitted to the microphone. Since such vibration-proof microphone 10 has the same vibration
sensitivity frequency characteristics as the microphone unit 1 for sound reception and the
microphone unit 2 for vibration big-up, it is easy to reduce the vibration noise. Microphone units
with the same characteristics are used. Further, in the vibration-proof type microphone 10, as
described above, the vibration pickup microphone unit 2 is housed in the housing 3 and the
sound from the outside is transmitted and transmitted. The purpose is to make only the vibration
of the housing 6 propagate well, and to make the sensitivity frequency characteristic of the
vibration isolation microphone 10 match the sensitivity frequency characteristic of the sound
receiving microphone unit 1. As described above, the above-mentioned noise is transmitted to the
vibration pickup microphone unit 2 so that only the vibration of the housing 3 is well transmitted
to the housing 3. The unit 2 is press-fitted, or the unit 2 is sealed with a resin serving as the
housing 3 so that the ingress and egress of the air into which the sound wave intrudes does not
occur. The degree of sound produced by the housing 6 of the imaging pickup microphone unit 2
obtained in this manner is, for example, about 10 dB in the low frequency region around 100 Hz
in FIG. 1, and increases as one frequency increases. There is a tendency to grow larger. In other
words, the sound receiving microphone unit 1 and the vibration pickup microphone unit 2. If
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microphone units of the same characteristics are used, the unit 2 is about 10 dB less sensitive
than the unit 1 in the vicinity of 10 Qllz, and in the higher frequency range, the sensitivity
difference is increased. Therefore, if the output signals of the microphone unit for sound
reception: /) 1 and the microphone unit 2 for vibration pickup are combined in the opposite
phase as described above, the sensitivity frequency characteristic as the vibration isolation
microphone 1 o is A sensitivity difference of 10 αB or more occurs between the unit 1 and the
unit 2.
For this reason, the sensitivity frequency characteristics of the vibration isolation type
microphone 1 o are determined by the unit 1 and only mechanical vibration noise should be able
to be reduced. However, as shown in the second factor, the same single-finger type microphone
unit is used for the sound receiving microphone unit 1 and the vibration pickup microphone unit
2 as shown in the second factor, and the case 3 as shown in FIG. Since the sound wave
introducing hole 5 for obtaining the directivity of the unit 20 is closed, the output of the unit 2
becomes as follows according to the results of actual inspection of the present inventors. That is,
although the vibration sensitivity frequency characteristic does not change, the sensitivity
frequency characteristic rises in the low frequency region, and as shown in FIG. 3, the
characteristic 6 of the sensitivity frequency characteristic α of the receiving microphone unit 1
is obtained. The In other words, since the characteristic of the vibration pickup microphone unit
2 is essentially the same as the characteristic of the sound receiving microphone unit 1, the same
inclined state (sound pressure gradient type characteristic) as the characteristic α of the unit 1
is obtained. Even though it is a lotus. It has characteristics close to the pressure type. For this
reason, the sensitivity frequency characteristic of the conventional vibration isolation type
microphone 10 does not actually become the sensitivity frequency characteristic determined by
the unit 1 as described above, but is shown in the third factor C in the low frequency region It
had a deteriorated characteristic. In the prior art, in order to avoid the influence on the
microphone unit 1 for receiving sound as much as possible, and to make the characteristics of
the protection type microphone 10 close to the characteristics of the unit 1, conventionally It is
possible to further increase the pitch and pitch. That is, a small gap into which the sound wave
penetrates, 2 (etc. sealed with resin. The characteristics of the microphone unit for vibration big
amplifier 2 in the low frequency range are particularly lowered by increasing the thickness of the
housing 6 or changing the material to a metal that is hard to pass sound waves, or 1-. 7'J "L ZIA
et al., As described above, it is necessary to increase the size and N of the vibration isolation
microphone 10, for example, as shown in FIG. The camera had a major drawback of being
converted to a 20-type camera and getting even worse. The same reference numerals as in FIG. 1
in FIG. 2 denote the same or equivalent. 4.5 is a sound wave introduction hole, 40 is a void hole.
FIG. 5 is also a perspective view j) [a self-directional microphone unit 余, a perspective view for
reference. OBJECTS OF THE INVENTION The object of the present invention is to eliminate the
above-mentioned drawbacks of the prior art, and without thickening the case or configuring it
with metal etc., ie without increasing the thickness and weight of the microphone. It is an object
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of the present invention to provide a vibration absorbing type microphone supporting structure
capable of improving sensitivity frequency characteristics of the microphone by improving the
microphone unit for vibration pickup constituted by a directional microphone unit.
[Summary of the invention] A feature of the present invention is that the front surface of the
diaphragm does not cause a change in the sensitivity frequency characteristic of the vibration
pickup month 1 microphone unit if it is interrupted by the case. In order to obtain the sound
wave introduction hole and directivity, the sound path between the sound wave introduction hole
and the sound passage hole is provided. DESCRIPTION OF THE PREFERRED EMBODIMENTS The
present invention will be described below with reference to the drawings. FIG. 6 is a partial crosssectional view of the anti-vibration microphone having an embodiment of the support structure
for the anti-vibration microphone according to the present invention. In the same figure, the
same symbols as those of% cause the same thing and the same thing. The vibration-proof
microphone 50 of this embodiment differs from the vibration-proof microphone 10 of FIG. 2
showing the conventional example in that the sound wave introduction hole 5 of the vibration
pickup microphone unit 2 is closed by the case 3 In order not to be, it is a point connected by the
sound introducing holes 4 and 5 or the sound path 15 through which air can pass. As a result,
even if the sound wave force 5 from the outside via the body 6 is small and thus it enters the
microphone unit 2 for vibration pickup, the sound wave introducing hole on the front surface of
the imaging plate of the unit 2 4 sound waves reach, and also the diaphragm to the rear surface
In order for the sound wave from the sound wave introducing hole 5 to reach, the sensitivity
frequency characteristic of the unit 2 can maintain the characteristic of the original sound
pressure gradient type. FIG. 7 is a sensitivity frequency characteristic diagram of FIG. A
characteristic curve .alpha. Indicated by an alternate long and short dash line shows a
characteristic curve of the 1 DEG 9 sound 10 microphone unit 1, and a characteristic curve
indicated by a broken line shows a characteristic curve of the vibration pickup microphone unit
2. As shown in FIG. As is apparent from FIG. 7, the sensitivity of the microphone a phone unit 2
for vibration pickup is particularly the effect of the noise or sound by the housing 3 even if the
housing 3 '4r is thick or if it is made of metal. Is sufficiently used, it is found that the
characteristics remain the same as those of the microphone y,-= y) for receiving the sound, and
the sensitivity is sufficiently reduced. That is, in this embodiment, the sensitivity difference of 10
αB or more can be obtained between the unit 1 and the unit 2 even in a low frequency region of
about 100 # z. The sensitivity frequency characteristic of the vibration isolation type microphone
50 is determined by the unit 1 as described in the prior art. That is, the sensitivity frequency
characteristic obtained by the subtractor 30 of FIG. 6 is as shown by a curve C shown by a solid
line in FIG. 7, and distortion at the surrounding frequency is also removed. FIG. 8 is a partial
sectional view showing a second embodiment of the present invention.
In the figure, the same reference numerals as in FIG. 6 denote the same or equivalent items. In
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the second embodiment, the imaging pickup microphone unit 2 cut off from the external space
by the housing 3 is supported by the microphone unit support member having a sound path 15.
fL In FIG. 8, the sound wave introducing hole 5 is also disposed on the side surface of the
imaging unit 2 for microphone for acoustic imaging, but according to the habit as shown in FIG.
Even in the case where the sound wave introducing hole 5 for obtaining the above is at the
bottom of the unit 2, it can be sufficiently coped with. [Effects of the Invention] As apparent from
the above description, according to the present invention, The support structure of the
microphone unit for sipping up 7 ° is connected to the sound wave introduction hole on the
front surface and the sound wave cross hole for obtaining directivity by a sound path through
which air can pass. Without thickening the body or making up with metal. There is an effect that
the sensitivity frequency characteristic of the vibration isolation type microphone can be made to
almost coincide with the sensitivity frequency characteristic of the sound receiving microphone
unit. That is, according to the present invention, it is possible to make the sensitivity frequency
characteristics of the anti-vibration type microphone substantially close to the ideal without
increasing the size and weight of the microphone.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a partial sectional view for explaining the configuration of a conventional vibration
isolation type microphone, FIG. 2 is a partial sectional view showing an example of a
conventional vibration isolation type microphone 0, and FIG. 3 is FIG. Fig. 4 is a sensitivity
frequency characteristic diagram of Fig. 4 is a VTR internal camera with a vibration isolation type
microphone, Fig. 5 is a perspective view of the uni-directional microphone a phone used in Fig. 2
Fig. 6 is a diagram FIG. 1 is a partial cross-sectional view of a vibration-proof microphone having
an embodiment of the present invention.
FIG. 7 is a sensitivity frequency characteristic diagram of FIG. 6, and FIG. 8 is a partial sectional
view showing a second embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ...
Microphone unit 2 for sound reception 2 ... Microphone a phone unit 3 for vibration pickups 3 ...
Case 4.5 ... Sound wave introduction hole 6 ... Microphone unit support member 15 ... Sound path
30 ... subtractor list 4 Zusatsuki et view charge '7 Zuuguisu 2 concave
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