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JP2007300268

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DESCRIPTION JP2007300268
An object of the present invention is to obtain not only a microphone main body but also a
microphone unit in common, and by changing inexpensive directivity changing means, desired
directivity can be obtained. SOLUTION: A microphone unit 100 formed by housing an
acoustoelectric converter 110 including a diaphragm and a fixed pole in a unit housing 101
having a front acoustic terminal 102 has a microphone housing 201 having a rear acoustic
terminal 202. In the condenser microphone which is attachable to and detachable from the
microphone main body 200 in which the audio output circuit board 211 is accommodated, a
partition wall 220 is provided in the microphone housing 201 to have a predetermined volume
with the acoustoelectric converter 110. While forming the air chamber 240, the rear acoustic
terminal 202 is formed along the axial direction in the surrounding wall surrounding the air
chamber 240, and the directivity in this state is a hypercardioid. A directivity changing means for
changing the distance between the acoustic terminals of the part-rear part is accommodated to
make the directivity a cardioid or non-directional. [Selected figure] Figure 2
コンデンサマイクロホン
[0001]
The present invention relates to a condenser microphone, and more particularly, to a condenser
microphone provided with an attachment as a directivity changing means for changing
directivity, and obtaining a desired directivity by replacing the attachment.
[0002]
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1
When using a microphone, it may be desirable to switch directivity depending on the situation in
which sound is collected.
For example, a hypercardioid is preferred when picking up an instrument sound such as a drum,
and a cardioid is said to be preferred when there is a sound other than the purpose of picking up
sound or when it is used for sound amplification. Also, for example, when there is no sound other
than the purpose of sound collection in the studio, or when there is no need to expand the sound,
omnidirectionality is preferably selected.
[0003]
It is not preferable in terms of storage as well as cost problems to separately prepare
microphones having each of these directivity. Therefore, the microphone unit is separated from
the microphone body provided with the microphone unit provided with the acoustoelectric
converter including the diaphragm and the fixed pole, and the output connector connected to the
audio output circuit and the phantom power source. There are commercially available variable
directivity microphones in which microphone units having different directivity can be replaced.
[0004]
Although various proposals have been made to change the directivity without replacing the
microphone unit, variable directional condenser microphones included in such a category are
described in Patent Documents 1 and 2 The thing can be illustrated. JP-A-11-69481 JP-A-2005184347
[0005]
However, in the above-mentioned conventional unit exchange type condenser microphone, even
if the microphone main body can be made common, in the case where it is desired to switch the
directivity to, for example, hypercardioid, cardioid or nondirectional, Part 3 It is necessary to
have different types of microphone units, and the cost problem is still not solved.
[0006]
Therefore, the object of the present invention is to provide not only the microphone body but
also the microphone unit in the condenser microphone so that the desired directivity can be
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2
obtained only by replacing the inexpensive directivity changing means (attachment). is there.
[0007]
In order to solve the above-mentioned problems, according to the present invention, as described
in claim 1, a diaphragm and a diaphragm which are disposed opposite to each other via a spacer
are fixed in a cylindrical unit housing having a front acoustic terminal. A microphone unit
containing an acoustic-electric converter including a pole, a sound hole for causing a sound wave
from the rear acoustic terminal to act on the back surface of the diaphragm on the fixed pole
side, and an electrode extraction rod for the fixed pole; An audio output circuit board including
an impedance converter connected to the electrode drawing rod is accommodated in a cylindrical
microphone housing having substantially the same diameter as the unit housing, and an output
connector is provided on the rear end side. A condenser microphone having the above-mentioned
unit body detachably attached to the tip end side of the above-mentioned microphone housing,
the above-mentioned acoustic There is provided a partition wall which forms an air chamber of a
predetermined volume with an air converter, and the rear acoustic terminal is formed along the
axial direction on the surrounding wall surrounding the air chamber, and in the air chamber It
comprises a directivity changing means which is accommodated removably and adjusts the
distance between the front sound terminal and the rear sound terminal by adjusting the distance
between the sound terminals, and the directivity changing means is provided in the air chamber.
It is characterized in that the directivity indicates hypercardioid when it can not.
[0008]
In the present invention, as described in claim 2, in the directivity changing means, the distance
between the acoustic terminals is made shorter than in the case of the hypercardioid to make the
directivity a cardioid It is preferable to include a sex variable means and a second directivity
variable means for acoustically closing the sound hole or the rear acoustic terminal on the fixed
pole side to make the directivity non-directional.
[0009]
In the present invention, as described in claim 3, one end side of the partition wall is electrically
connected to the impedance converter, and the other end side is electrically connected to the
electrode lead rod. It is preferable that a connector pin provided with a terminal and projected
toward the center of the air chamber is provided, and the directivity changing means is disposed
in the air chamber with the connector pin as a guide.
[0010]
In the present invention, as described in claim 4, the first directivity variable means is fitted to
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the connector pin and coaxially disposed in the air chamber, and the rear acoustic terminal is
circumferentially arranged. It is preferable to consist of a cylindrical body which closes a part of
the axial rear end side of.
[0011]
Further, in the present invention, as described in claim 5, in the above-mentioned claim 3, the
second directivity changing means is fitted to the connector pin and coaxially disposed in the air
chamber, It is preferable that the sound hole be formed of a cylindrical body that acoustically
closes the sound hole on the fixed electrode side at the tip end portion.
[0012]
In the present invention, as described in claim 6, a surrounding wall surrounding the air chamber
may be included in the microphone case side, and as described in claim 7, the air may be
included in the air. An enclosure wall surrounding the chamber may be included in the unit
housing side.
[0013]
According to an eighth aspect of the present invention, the rear acoustic terminals are formed
along the circumferential direction of the surrounding wall surrounding the air chamber, and a
plurality of the rear acoustic terminals are juxtaposed at predetermined intervals in the axial
direction. It may consist of a slit.
[0014]
According to the present invention, when the directivity changing means is not inserted into the
air chamber, the polar pattern operates as a hypercardioid condenser microphone.
On the other hand, the first directivity variable means is inserted into the air chamber to shorten
the distance between the acoustic terminals of the front and rear acoustic terminals, thereby
operating as a condenser microphone whose polar pattern exhibits a cardioid.
Further, by inserting the second directivity variable means into the air chamber and acoustically
closing the sound hole or rear acoustic terminal on the fixed pole side, the polar pattern operates
as a condenser microphone showing nondirectionality.
03-05-2019
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[0015]
As described above, according to the present invention, it is possible to obtain desired directivity
only by replacing the directivity changing means with the microphone body and the microphone
unit in common.
Moreover, since the directivity changing means can be manufactured inexpensively by using a
synthetic resin, the overall cost can be significantly reduced.
[0016]
First, the basic embodiment of the condenser microphone according to the present invention will
be described with reference to FIGS. 1 to 3.
1 (a) is a front view showing the front acoustic terminal side of the condenser microphone
according to the present invention, FIG. 1 (b) is a right side view thereof, FIG. 2 is an exploded
sectional view, FIG. 3 is an enlarged sectional view showing details of the microphone unit It is.
[0017]
As shown in FIGS. 1 and 2, the condenser microphone CM includes a microphone unit 100 and a
microphone body 200, and the microphone unit 100 is detachable from the microphone body
200.
[0018]
As shown in FIG. 3, the microphone unit 100 includes a cylindrical unit housing 101 made of a
metal material such as aluminum or brass alloy having a front acoustic terminal 102 formed by
radial slits at the front end, In the unit housing 101, a capacitor type acoustoelectric converter
110 is housed.
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The front acoustic terminal 102 may be formed of a simple round hole.
[0019]
The acoustoelectric converter 110 includes a diaphragm 120 stretched with a predetermined
tension on a metal diaphragm ring 121 and a fixed electrode 130 supported by an electrically
insulating pedestal 133 via a spacer ring (not shown). They are disposed opposite to each other,
and are firmly fixed in the unit housing 101 by the lock ring 136.
[0020]
In the fixed electrode 130 and the pedestal 133, sound holes 131 and 134 for making sound
waves from the rear acoustic terminal 202 described later act on the back side of the diaphragm
120 are bored.
In addition, an electrode lead rod 135 electrically connected to the fixed pole 130 via a wiring
member (not shown) is provided at the central portion of the pedestal 133.
[0021]
The microphone main body 200 includes a cylindrical microphone housing 201 made of a metal
material such as aluminum or a brass alloy, which has substantially the same diameter as the unit
housing 101, for example.
Most part of the inside of the microphone housing 201 is occupied by a board storage portion
210 for storing the audio output circuit board 211.
Although not shown, a field effect transistor (FET) as an impedance converter is mounted on the
audio output circuit board 211.
[0022]
A 3-pin output connector 212 is provided at the rear end of the microphone housing 201 on the
side opposite to the microphone unit, and a phantom power supply (both not shown) is
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6
connected to the output connector 212 via a balanced two-core shielded cable. Ru.
[0023]
Further, in the microphone housing 201, a partition wall 220 for sealing the substrate storage
portion 210 substantially and forming an air chamber 240 of a predetermined volume with the
acoustoelectric converter 110 of the microphone unit 100 is provided. ing.
In this example, the partition wall 220 is fixed at a predetermined position in the microphone
housing 201 via the fixing ring 230.
[0024]
Then, the rear acoustic terminal 202 is formed in an enclosure surrounding the air chamber 240.
In this example, a part on the tip end side of the microphone housing 201 is assigned to a
surrounding wall surrounding the air chamber 240, and a slit 202s having a predetermined
length in the axial direction to be the rear acoustic terminal 202 is formed in the surrounding
wall part. ing.
As shown in FIG. 1B, the slits 202s are preferably formed parallel to each other at a
predetermined interval over the entire circumference of the enclosure wall.
[0025]
At the central portion of the partition wall 220, a guide cylinder 221 coaxially projecting into the
air chamber 240 is provided in a projecting manner, and in the guide cylinder 221, a connection
terminal 222a electrically connected to the electrode drawing rod 135 is provided. The
connector pins 222 are embedded.
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The other end side of the connector pin 222 is connected to the field effect transistor of the
audio output circuit board 211 via a wiring member (not shown).
[0026]
The rear acoustic terminal 202 exists near the center of the slit 202s. Therefore, as shown in FIG.
4, when the microphone unit 100 is attached to the microphone body 200 without inserting
anything into the air chamber 240, the distance between the acoustic terminals of the front
acoustic terminal 102 and the rear acoustic terminal 202 is the longest. Since the sensitivity of
the bi-directional component is increased, the hypercardioid condenser microphone CM-H can be
used. As a reference, a graph of frequency response when hypercardioid is used is shown in FIG.
7a, and a polar pattern is shown in FIG. 7b.
[0027]
Next, the case of using as a cardioid condenser microphone CM-U will be described with
reference to FIGS. 5 (a) and 5 (b). In this case, the first attachment 310 as the first directivity
changing means shown in FIG. 5A is used.
[0028]
The first attachment 310 has a guide hole 311 fitted to the guide cylinder 221 of the partition
wall 220 at the center and an electrode insertion hole 313 through which the electrode lead-out
rod 135 is inserted. 202s) is a cylinder made of a synthetic resin that closes a part at the axial
rear end side, preferably at the front end side is provided with a spacer protrusion 314 that abuts
on the pedestal 133 of the acoustoelectric converter 110 to seal axial movement.
[0029]
By arranging the first attachment 310 coaxially in the air chamber 240 as shown in FIG. 5B, the
distance between the acoustic terminals of the front acoustic terminal 102 and the rear acoustic
terminal 202 is hypercardioid. Also, since the sensitivity is shortened as well, the condenser
microphone CM-U of cardioid can be used.
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As a reference, a graph of frequency response in the case of the cardioid is shown in FIG. 8a, and
a polar pattern is shown in FIG. 8b.
[0030]
Next, the case of using the nondirectional condenser microphone CM-O will be described with
reference to FIGS. 6 (a) and 6 (b). In this case, a second attachment 320 is used as second
directivity changing means shown in FIG. 6 (a).
[0031]
The second attachment 320 is made of a synthetic resin cylindrical body having a guide hole 321
fitted to the guide cylinder 221 of the partition wall 220 at the center and an electrode insertion
hole 322 through which the electrode drawing rod 135 is inserted. And a sleeve 323 for
airtightly contacting the bottom surface of the fixed pole 133 to prevent sound waves from the
rear acoustic terminal 202 from entering the sound hole 134 of the fixed pole 133.
[0032]
By arranging the second attachment 320 coaxially in the air chamber 240 as shown in FIG. 6B,
the sound hole 134 of the fixed pole 133 is acoustically closed, so that the omnidirectional
condenser microphone CM is obtained. It can be -O.
[0033]
In addition, when making it nondirectional in this way, the air chamber 241 of a predetermined
volume is provided in the sleeve 323 of the second attachment 320 so that the sensitivity does
not change, and the back air chamber of the diaphragm 120 It is preferable to
As a reference, FIG. 9a shows a graph of frequency response in the case of providing the air
chamber 241 as nondirectional, and a polar pattern is shown in FIG. 9b.
[0034]
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9
Although the present invention has been described above based on the illustrated example, the
present invention is not limited thereto.
In the above embodiment, the air chamber 240 is formed in the microphone housing 201 of the
microphone main body 200, and the slit 202s to be the rear acoustic terminal 202 is formed on
the circumferential surface of the microphone housing 201 which is the enclosure wall. The
sleeve portion of the unit housing 101 of 100 may be extended to form the inside as an air
chamber 240, and a slit 202s to be a rear acoustic terminal 202 may be formed in the sleeve
portion.
[0035]
Further, although the slits 202s to be the rear acoustic terminals 202 are formed along the axial
direction of the microphone housing 201, the slits 202s are formed along the circumferential
direction of the microphone housing 201, and the slits along the circumferential direction are
formed. It may be arranged in parallel at predetermined intervals in the axial direction. In the
case of nondirectionality, the rear acoustic terminal 202 may be closed instead of closing the
sound hole 134 of the pedestal 133.
[0036]
(A) is a front view which shows the front acoustic terminal side of the condenser microphone by
this invention, (b) is the right view. The disassembled sectional view of the above-mentioned
condenser microphone. The expanded sectional view which shows the detail of a microphone
unit. Sectional drawing which shows the capacitor | condenser microphone which made
directivity the hypercardioid. (A) Sectional drawing which shows 1st attachment, (b) It is
sectional drawing which shows the capacitor | condenser microphone which made directivity the
directivity by 1st attachment. (A) Sectional drawing which shows 2nd attachment, (b) It is
sectional drawing which shows the condenser microphone which made directivity nondirectional
by the 2nd attachment. The graph which shows the frequency response of the condenser
microphone which made directivity the hypercardioid of FIG. The characteristic view which
shows the polar pattern of the capacitor | condenser microphone which made directivity the
hypercardioid of FIG. The graph which shows the frequency response of the capacitor |
condenser microphone which made the directivity of FIG. 5 the cardoid. The characteristic view
which shows the polar pattern of the condenser microphone which made the directivity of FIG. 5
the cardoid. The graph which shows the frequency response of the capacitor | condenser
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microphone which made directivity the non-directivity of FIG. FIG. 7 is a characteristic diagram
showing a polar pattern of a condenser microphone in which the directivity shown in FIG. 6 is
nondirectional.
Explanation of sign
[0037]
DESCRIPTION OF SYMBOLS 100 microphone unit 101 unit case 102 front acoustic terminal 110
acoustic electrical converter 120 diaphragm 130 fixed pole 133 pedestal 131, 134 sound hole
135 electrode extraction rod 200 microphone main body 201 microphone housing 202 rear
acoustic terminal 202s slit 211 voice output Circuit board 212 Output connector 220 Partition
wall 221 Guide tube 222 Connector pin 240, 241 Air chamber 310 First attachment for cardioid
320 Second attachment for no directivity
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