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JPS5622889

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DESCRIPTION JPS5622889
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a conventional
microphone having a plurality of microphone units, FIG. 2 and FIG. 4 are explanatory views of a
microphone according to the present invention, and FIG. FIG. 5 is an explanatory view showing
frequency characteristics of a microphone and a conventional microphone, FIG. 5 is a perspective
view of the microphone according to the present invention, and FIG. 6a is an explanatory view of
holding microbons according to the present invention. DESCRIPTION OF SYMBOLS 10 ... board |
substrate, 11.11 ', 11' '... microphone unit, 12 degree 12', 12 '' ... diaphragm, 13 ... cloth paper, 14
... ring, 15 degree 15 ' , 15 '' microphone unit 16.16 ', 16' 'diaphragm, 17 cylinder, 19 rotary
body, 20 axis, 21 micro. Phone holding attachment. 1’l’I’1. Fig. 5--
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microphone 1-2
having a plurality of microphone units, i, r and a microphone unit arranged such that the
vibrating surface of the microphone units is on a predetermined surface. An object of the present
invention is to provide a low-cost microphone having sharp directivity in the longitudinal
direction of the microphone and having excellent frequency characteristics, in particular, high
frequency characteristics in a high region. Conventionally, microphones having a plurality of, for
example, three or more microphone units are attached in the same manner to a flat base & 20 at
predetermined intervals, as shown in FIG. The vibration plane of the unit 1 was in the same
plane. Then, by using the difference in distance from each microphone unit and the sound
source, that is, the phase difference, sharp directivity is provided in the longitudinal direction of
the microphone. Such as: ',: In the case where it is a plane wave or almost a plane wave when it is
intended to pick up the sound in the microphone), the front surface custom of the microphone
becomes a composite of the front surface characteristic or the ridge of the valley microphone
unit, Problems such as the decrease in sensitivity of the frequency response in the high
frequency range occur almost 0. However, when the distance between My 2-crophone and point
sound source becomes close, for example, the distance between point sound source and
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microphone becomes about 1m The sound wave to be tried must be regarded as not a plane
wave but a spherical wave, and the distance between the point sound source and each
microphone unit is different, so that the frequency characteristic between microphones at high
frequencies, eg 5 to 5 KHz When my sensitivity was lowered, I was struck by a fault. In addition,
when the sound source moved, the gap between each microphone unit and the sound source
became more remarkable, and the frequency characteristic of the microphone in the high region
further deteriorated. The present invention eliminates the above-mentioned drawbacks and will
be described in conjunction with FIG. FIG. 2 is an explanatory view of the gist of the microphone
according to the present invention. That is, on a flat rectangular substrate), one double-pitched
microphone unit n, n ', and J' are equally spaced, and the respective microphone units are in
phase, and so on. Microphone unit pregnancy plate Yu z, q2 ', 1.. Microphone unit 1 such that the
distance between f 'and the substrate 101m1 is different. u 'and 1f' are attached in the
longitudinal direction. For example, the distance between the moving plate 12 of the microphone
unit 11 and the board ↓ 01 is the distance between the diaphragm 12 ′ of the a1 microphone
unit 11 ′ and the substrate 10 is the diaphragm 12 ′ ′ of the b1 microphone unit T ′ ′ and
the substrate 10 Assuming that the distance between them is C, C> b> 3.
Then, the output signals of each microphone unit are synthesized to obtain an output. In the
microphone configured in this way, the distance between the microphone units is 6 cm, b = a +
2wn, c = a + 25, and the microphone in the case where there is a $ V'rC source that is 50 places
apart from Kamo on the center line of the microphone The frequency in front of the pot was
fixed. The results are shown in FIG. In the same i /], the actual game is that of the microphones
according to the present invention, the point is that of the conventional microphones in which
the diaphragms of all the microphone units are in the same half plane 1-A is the microphone and
the sound source And the distance B between the microphone and the sound source is 50 cn. As
a result, from the diaphragm of the microphone unit 1 at the central position, the imaging plates
of the microphone units 11 'and 1' at both 11111 are illuminated as the base and are projected
further forward. That is, by reducing the difference in distance between the sound source and
each microphone unit, it was possible to improve the frequency characteristic in the high
frequency band such as 5-lb KH2. Moreover, as the distance between the sound source and the
microphone;-"" becomes shorter, the improvement of the frequency characteristic is excellent. In
addition, when there is a sufficient distance difference from the sound source in the longitudinal
direction, the microphone has a sharp directivity in the longitudinal direction. And this directivity
does not fall. By providing a member having a large acoustic resistance in the high region in
front of the microphone unit 1Y ′, for example, a woven paper 13 of papillo / etc., The
microphone unit 1Y ′ is located at a position further away from the sound source Since the
impression change in the high region is reduced, the frequency characteristic in the high region
of the microphone is good. In addition, by attaching the front end of the microphone unit (i.e., the
microphone close to the sound source) 1 to the center of the microphone unit, the frequency
characteristic of the microphone in the high region can be further improved. In the above
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embodiment, although the case where the vibration surface of the microphone unit 5-node at the
side force protrudes in order from the vibration surface of the microphone unit at the central
portion has been described, conversely, as shown in FIG. The microphone unit 両 5 'and the
microphone unit 5'5', 15 "diaphragm 16C16 ′ ′ where the microphone unit 15 in both IIIs is
further apart, ie the diaphragm 16 of the microphone unit 15 in the inner 1 is outside. Even with
a microphone that is more likely to move out, it is advantageous that the open-a characteristic is
not as low as that of the conventional microphone, even if it is at a rate to move the sound source
or to the left or right.
FIG. 5 is a perspective view of the microphone according to the present invention, in which 10 is
the substrate having the hole described in FIG. 2, 1 ↓, vi, xi'-1d microphone unit, and 祁 is a
microphone unit J ' It is a woven paper such as papyron provided on the front surface, and J 4 is
a ring provided on the front surface of the microphone unit 10. And 1'7 is a cylinder which
formed hole 1 * 7 'which covers a microphone unit, The rotation support part 18 is formed in the
both ends. Then, when the microphone is held in the form as shown in FIG. 6a, the front of the
microphone x soil, n ', 1i',... It can be turned to J9 is a rotating body disposed at the central
portion of the cylinder 1'7. A shaft 20 is attached so as to be capable of refracting about 1800
with respect to the rotating body J9. The shaft 20 can be rotated 3600 relative to the
microphone holding and mounting portion 21, and when holding the microphone in the form as
shown in FIG. By rotating or refracting in a direction, each microphone unit of the microphone
can be directed to the sound source. By thus configuring the appendages other than the
microphone unit of the microphone, it is possible to place the microphone in various places, and
it is easy to direct the microphone unit to the sound source. Note that each microphone unit may
be fixed to the substrate, but if the microphone unit is made to project or retract from the
substrate by rotating the microphone unit, etc., the distance between the crossover source and
the microphone Since the position of each microphone unit can be adjusted, a microphone with
good frequency characteristics can be obtained. As described above, in the microphone according
to the present invention, in the microphones having three or more microphone units, the
respective microphone units are disposed so that the vibration and plane of all the microphone
units are not on the same plane. It has sharp directivity in the longitudinal direction of the
microphone and good frequency characteristics, and in particular, the trunk t of the microphone
unit disposed on the outside may be projected from the vibrating surface of the microphone unit
disposed on the inside By arranging each of the microphone units, the sensitivity of the
frequency characteristic in the high region becomes excellent, and only the height of the
vibrating surface of each of the microphone units is changed. Therefore, it has the feature that it
can be easily manufactured at the same level of cost.
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