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JPS55127491

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DESCRIPTION JPS55127491
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an example of sensitivity characteristics
and noise blocking level of a conventional vibration picker / type microphone, and FIG. 2 shows a
first embodiment of the vibration picker / type microphone according to the present invention.
FIG. 3 is a view showing sensitivity characteristics and noise blocking level of the vibration
pickup type microphone shown in FIG. 2. FIG. 4 is a cross section showing a second embodiment
of a vibration pickup 7W microphone according to the present invention. FIG. 5 is a sectional
view showing a third embodiment of the vibration pickup microphone according to the present
invention. Explanation of symbols of main parts, 1 ..... Support member, 2 ..... Piezoelectric
element, 3 ..... Case, 4 ..... Vibration pickup unit, 5 ... .... Speakers, 6 ..... .
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration pickup
microphone for detecting bone vibration at the time of human vocalization using a piezoelectric
element. In a vibration pickup type microphone that detects human voice 1-7275P / Put it out by
inserting it in the ear canal, a piezoelectric element is placed in a predetermined case, and the
end of this container etc. It is configured to be in close contact with a wall or the like and to
detect bone vibration at the time of utterance by the above-mentioned piezoelectric element. In
the case of the conventional vibration pick-up type microphone, since all parts of the case are
made of hard members, the vibration from each part of the case other than the vibration pickup
part tends to be transmitted to the piezoelectric element. In some cases, external noise or
vibration of the human body other than voiced sound intrudes 1 and the S // N ratio deteriorates.
In addition, since the piezoelectric element usually has a constant resonance frequency that can
not be suppressed, and the sensitivity is high in the vicinity of the resonance frequency (usually
1000 to 3000 Hz), external noise can not be sufficiently blocked in the vicinity of this frequency.
there were. FIG. 1 shows an example of the sensitivity characteristic S and the noise blocking
level R of the conventional vibration pickup type microphone. As is apparent from this figure, the
vibration pickup microphone has a particularly sensitive 2-frequency band, ie, 2K (in the vicinity
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of z) in which a range (the shaded area) where noise can not be prevented is generated and the
ratio is deteriorated. there were. An object of the present invention is to provide a vibration
pickup type microphone which prevents noise from entering through a case and has sufficient
noise blocking performance. The vibration pickup type microphone according to the present
invention prevents noise from invading by applying vibration proofing means to a predetermined
portion other than the vibration pickup portion of the case in which the piezoelectric element is
housed. By matching, it is possible to effectively block noise and to increase the sensitivity of
speech detection. Next, an embodiment of a vibration pickup microphone according to the
present invention will be described in detail with reference to the drawings. FIG. 2 shows a first
embodiment of the present invention. In the figure, the flat-plate-like piezoelectric element 2 held
by the support member 1 is housed in the case 3, and the same vibration pickup type
microphone as in the prior art is formed. By bringing the vibration pickup unit 4 into close
contact with the wall of the ear canal, it is possible to detect a person's voice.
In addition to this, in the case of this vibration pickup type microphone, the case 3 is
characterized in that a portion other than the vibration pickup portion formed at the tip end
portion is made of a vibration proofing member. A soft resin, a foamed resin, or the like is
preferably used as the vibration isolation member, and by selecting the material or the like, it is
possible to make the characteristics of the vibration absorption coincide with the resonance
frequency of the piezoelectric element. FIG. 3 shows an example of the noise blocking
characteristic R of the vibration pickup type microphone configured as described above. In the
case of this example, since the piezoelectric element has a resonant frequency of about 5 KH2
and a frequency of about 5 kHz, its sensitivity is high in a band centered at this frequency, ie, in a
{circle around (2)} area. For this reason, the vibration absorption characteristics of the vibration
isolation member used in the case 3 are set around this frequency, and the noise blocking level R
of this vibration pickup microphone has a curve characteristic as shown in the figure. For this
reason, it is possible to improve the sensitivity of the piezoelectric element as illustrated in the
curve 4-S ′ without noise in the vicinity of the resonance frequency of the piezoelectric element.
When this vibration pickup type microphone is used, external noise from the back of the case 3
is less likely to intrude, and vibration conducted to parts other than the vibration pickup unit
inserted into the wall of the ear hole of the case 3 is generated by the piezoelectric element. Since
the detection is not performed, for example, the deterioration of the S / N ratio does not occur
due to the vibration of the human body other than the vocal sound due to the movement or the
like. FIG. 4 shows a second embodiment of the vibration pickup microphone according to the
present invention. In the case of this embodiment, in addition to the microphone portion by the
piezoelectric element 2, the sound generation portion by the speaker 5 is housed inside the same
case 3, and the vibration pickup portion 4 is closely attached to the wall of the ear hole to make
human voice , And at the same time it is detected that the sound from the sound producing part
can be heard through the sound path 6 by switching. Also in the case of this embodiment, since
the portion other than the vibration pickup portion at the tip of the case 3 is made of a
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predetermined vibration proofing member, the microphone portion by the piezoelectric element
25- has the same noise rejection capability as the above embodiment. It is possible to effectively
block the vibration generated in the portion of the speaker 5 etc., reduce the interference
between the microphone portion and the speaker portion, and alternately operate as a
transmitter and a receiver. FIG. 5 shows a third embodiment of the present invention. In the case
of this embodiment, the case 3 made of a hard member is characterized in that a portion other
than the vibration pickup portion 4 at the tip end portion is covered by the anti-vibration
member 7.
Also in this method, no vibration as noise is transmitted to the case 3 from the outside, and even
if vibration occurs in the case 3, the vibration is absorbed by the anti-vibration member 7 so that
the ratio is 8 / N. Excellent voice detection is possible. In the case of this method, the vibration
pickup unit 4 may be covered with a new member having excellent vibration transfer
characteristics corresponding to the vibration-proofing member 7. The vibration pickup type
microphone according to the present invention has vibration-proof means in its case portion. As
a result, the signal-to-noise ratio is improved as compared to the prior art 6 and, as a result, the
sensitivity of the vibration detection element can be enhanced, and the range of use of this type
of vibration pickup microphone is expanded. There is an advantage that the handling becomes
easy. In the case 3, the portion to which the anti-vibration means is applied is not necessarily all
the parts other than the tip as in the above embodiment, but a portion to be a predetermined
partition or a wall to be inserted into the ear hole It is also possible to use only part of Case 3.
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