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DESCRIPTION JPS52161634

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DESCRIPTION JPS52161634
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 (a) and 1 (b) relate to an embodiment of a
microphone device according to the present invention, showing a state of being withdrawn out of
a state ha body accommodated in a pipe cover case for sound attenuation FIG. 2 is a side crosssectional view showing a state in which a pipe for sound guiding based on another embodiment
is drawn out of the housing. 11 ... housing, 12 ... fitting, 13 ... microphone unit, 14 ... sound
guiding pipe, 141 ... ... side wall hole .
DETAILED DESCRIPTION OF THE PROBLEM The present invention relates to a microphone
device which allows a directivity to be confidently varied as much as possible in a built-in
microphone. - IRK Microphone device built into tape recorder Omnidirectional microphone is
used so that sound from sound source in the direction of deviation can be collected with constant
sensitivity. By the way, sometimes you want to collect sound with sound from a sound source in
one direction with directivity. However, as stated above Δlbl &! 4 which uses an omnidirectional
microphone and uses it k very inconvenient because it can not use any purpose for such purpose.
In view of the foregoing, the present invention has been made in view of the above-mentioned
problems, and it is an object of the present invention to provide an extremely good microphone
device which has a built-in microphone so that directivity can be set to 4 and surely 4 .
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present
invention will now be described in detail with reference to the drawings. That is, II in FIG. 1 (a) is
a casing such as a tape recorder, and the sound receiving portion is exposed to a predetermined
portion such as #J on the casing IIO or the side surface and the like is attached to a fixture 12 A
microphone unit 13 having directivity only in extremely limited direction or omni-directional
omni-directionality is attached. The microphone unit 13 is enclosed so as to be freely movable
inside and outside the housing 11 to provide a sound propagating vibe 14 having a plurality of
side wall holes 14. Thus, when the microphone device constructed as described above is used in
a normal state, that is, omni-directional harmonic waves with directivity only in a very limited
23-09-2018
1
forward direction, as shown in FIG. 1 a It is good to have the sound guiding pipe I4 housed in the
housing lI. When using it in a direction with directivity in a certain direction K11m, as shown in
Fig. 1 bK, the sound guiding pipe 14 is pulled out of the case ll. That is, in this case, the sound
incident from the direction orthogonal to the axis of the sound guiding pipe Z 4 is the position of
each side wall hole 141 of the sound guiding pipe 14. Therefore, when reaching the sound
receiving part of the microphone unit 12, the phase Ic of the sound from each sound source is
different so that the sound from this direction becomes directive with respect to the sound so
that it gets killed to make it poor. In this case, the same thing can be said for the sound incident
from a direction slightly deviated from the axis VC, not from the direction VC which is orthogonal
to the axis of the pipe 14 for sound guide. , 1 'FIG. 2 shows another embodiment in which a pipe
24 for sound guiding provided by enclosing the microphone unit 13 so as to be freely movable
inside and outside the tubular body 1 IL 7 is provided with a plurality of side basket holes 241,
242, 243 are cylindrically connected at several points so that they can be expanded and
contracted.
In this case, in the microphone device in this case, the preceding example can sharp the
directivity only with respect to a certain tone range frequency, whereas by extending /
contracting the pipe 24 for sound propagation appropriately, the directivity Having the range of
sound frequency Frequency itself variable as much as possible and features a score! , □, ___ b.
Therefore, according to the present invention, as described above in detail, it is possible to
provide a very good microphone device which can easily and surely bring the directionality even
with a built-in microphone. It is to be understood that the present invention is not limited to the
above-described embodiments, and various modifications can be made without departing from
the spirit of the present invention. A pair of chips having a quadratic surface in predetermined
portions may be provided in a form of a dozer or a switch as a countermeasure against wind
noise, for example, by providing pipes 14 or 24 for sound guiding.
23-09-2018
2
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