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JP2010288048

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DESCRIPTION JP2010288048
[PROBLEMS] A contact microphone for a stringed instrument, which is detachable between the
legs of a piece supporting a string, so that the piece is not deformed or damaged, and slack or
deviation does not occur even when used for a long time. A contact microphone for a stringed
musical instrument is mounted in the legs 2 and 3 of a piece 1 supporting a string of a stringed
musical instrument and converts the vibration of the string into an electrical signal and outputs
the same. Microphone body 11, a pair of support arms 20 protruding substantially coaxially on
opposite side surfaces of the housing 12, and a predetermined pressure on the inner surfaces 2 a
and 3 a of the leg portions provided at the tip of each support arm 20 The presser 24 which
abuts, and a pressure application means (adjustment nut) 23 which applies pressure to the
presser 24 are provided. Each presser 24 is provided with an arc surface at least in a portion in
contact with the inner surfaces 2a and 3a of the legs. [Selected figure] Figure 2
Contact microphone for stringed instruments
[0001]
The present invention relates to a vibrating contact microphone for a stringed instrument
detachably attached to a stringed instrument piece, and more particularly to a contact
microphone for a stringed musical instrument suitable for contrabass, which is not loosened by
string vibration during performance. .
[0002]
In many cases, a piezoelectric element that does not require an electronic circuit is used for a
contact microphone (vibration pickup) that picks up vibration of a stringed instrument such as a
contrabass (see, for example, Patent Documents 1 and 2).
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[0003]
Since the acceleration type pickup has resonance in the high region, for example, in a contact
microphone for contrabass, a change in compressive force is inserted into a part of an instrument
to be converted into a voltage by a piezoelectric element.
[0004]
As described in Patent Documents 1 and 2, this type of contact microphone is generally used by
being fixedly incorporated in a part of an instrument, but in FIG. An example of the microphone
is shown and described.
[0005]
The contact microphone 10 is disposed, for example, inside the legs 2 and 3 formed in a
bifurcated shape on the contrabass bridge 1 and is not shown in the box-shaped housing 12. The
microphone main body 11 which accommodated the piezoelectric element is provided.
[0006]
Support arms 13 and 14 project substantially coaxially as a pair from opposite side surfaces of
the housing 12.
In this example, one support arm 13 has a fixed length, and the tip thereof is provided with a
pressing element 13a that abuts the inner surface 2a on the leg 2 side.
[0007]
On the other hand, the other support arm 14 is composed of a male screw shaft 14a and a
pressing element 14b screwed on the tip end side thereof and in contact with the inner surface
3a on the leg 3 side.
That is, the other support arm 14 is an adjustment arm whose length can be adjusted by turning
the pressing element 14b.
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[0008]
According to this, after disposing the contact microphone 10 in the legs 2 and 3 in a state where
the support arm 14 is contracted, the length of the support arm 14 is increased by rotating the
pressing element 14 b in a predetermined direction. By pressing the pressers 13a and 14b
against the inner surfaces 2a and 3a of the corresponding legs, the contact microphone 10 is
mounted in a state of being stretched in the legs 2 and 3.
[0009]
In this mounted state, when a string (not shown) is repelled, the vibration is transmitted from the
piece 1 to the piezoelectric element in the microphone body 11 through the support arms 13 and
14, and the voltage generated by the piezoelectric element is output cable 15 Is given to a
reproduction device (not shown) or the like.
[0010]
The contact microphone 10 can be removed from the bridge 1 by turning the pressing element
14 b in the opposite direction to shorten the length of the support arm 14.
[0011]
In this manner, the contact microphone 10 can be easily attached to and detached from the piece
1, but since the shape of the piece 1 is various, even if the shape is slightly different, it can be
securely fixed. In this conventional example, the pressers 13a and 14b have a conical shape, and
are made to bite into the inner surfaces 2a and 3a of the legs.
[0012]
According to this, a mechanical vibration coupling state close to point contact can be obtained,
but on the other hand, the following problems occur.
[0013]
That is, since the pressing force per unit area is high, the piece 1 made of wood may be
plastically deformed and loosened, which may change the sound quality.
[0014]
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Therefore, a stronger pressing force will be applied to the pressing elements 13a and 14b, but
this not only makes the bite marks on the inner surfaces 2a and 3a of the legs deeper but also
causes vibration to be applied during the performance of the musical instrument. Loosen.
This will be repeated.
[0015]
In addition, if the contact positions of the pressers 13a and 14b are changed so as not to deepen
one wound, the bites on the inner surfaces 2a and 3a of the legs increase, and while the contact
microphone 10 is repeatedly attached and detached. , There is a possibility that the pressing
elements 13a and 14b will be re-engaged in the previous insertion scratch.
[0016]
JP 2003-167583 A JP 2007-333786 A
[0017]
Therefore, an object of the present invention is to provide a detachable contact microphone for a
stringed instrument between the legs of a piece supporting a string, wherein the piece is not
deformed or scratched, and loosening or shifting does not occur even when used for a long time
It is to be done.
[0018]
In order to solve the above problems, the present invention is a contact microphone for a
stringed instrument mounted in the leg of a piece supporting a string of a stringed instrument,
converting the vibration of the string into an electrical signal and outputting the same. A
microphone body having a pair of support arms projecting substantially coaxially on opposite
side surfaces of the housing, and a pressure provided at the tip of each support arm and abutted
against the inner surface of the leg with a predetermined pressure The presser and the pressure
applying means for applying pressure to the presser are characterized in that each presser is
provided with an arc surface at least in a portion in contact with the inner surface of the leg.
[0019]
According to a preferred aspect of the present invention, each pressing element is formed of a
cylindrical body whose axis is oriented parallel to the thickness direction of the leg.
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[0020]
In addition, in order to apply a predetermined pressure to the leg portions so as to cause the
pressure elements to abut, at least one of the support arms is a male screw shaft, and the
pressure applying means is a female screw engaged with the male screw shaft. An aspect in
which the pressing element is supported by the adjusting nut is preferably adopted.
[0021]
According to the present invention, each pressing element is provided with a circular arc surface
at a portion in contact with the inner surface of the leg of the piece, so that the pressure element
is in linear contact with the inner surface of the leg Become.
Therefore, there is no possibility that the piece will be deformed or scratched, and it will be used
for a long time, and even if it receives vibration due to the performance of the instrument, it will
hardly loosen or shift, and the sound quality will change during the performance of the
instrument. Absent.
[0022]
BRIEF DESCRIPTION OF THE DRAWINGS The front view which shows the exact microphone for
stringed instruments which concerns on embodiment of this invention as a partial cross section.
The front view which shows the attachment state of the said contact microphone for stringed
instruments.
The front view which shows the attachment state of the conventional tactile microphone for
stringed instruments.
[0023]
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Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2,
but the present invention is not limited thereto.
The same reference numerals as in the conventional example described above with reference to
FIG.
[0024]
As shown in FIG. 1, the stringed instrument tactile microphone 10A according to this
embodiment includes a microphone main body 11 in which a piezoelectric element 12a is
accommodated in a box-shaped casing 12.
An output cable 15 of the piezoelectric element 12 a is connected to the microphone body 11.
[0025]
Support arms 20, 20 are coaxially protruded on the opposite side surfaces of the housing 12 as a
left-right pair.
In this embodiment, the support arms 20 and 20 both include male screw shafts 21 and 21, and
the base end portions 21 a and 21 a are in the form of a flat plate in the housing 12 and are in
contact with the piezoelectric element 12 a.
[0026]
The pressure elements 24, 24 are supported on the end portions 21b, 21b side of the male screw
shafts 21, 21 via the pressure applying means 22, 22, respectively.
In FIG. 1, although the pressure application means 22 and the presser 24 on the right side are
shown in cross section, the pressure application means 22 and the presser 24 on the left side
have the same structure.
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[0027]
The pressure applying means 22 applies a predetermined pressure to the pressing element 24
when attaching the stringed instrument tactile microphone 10A between the legs 2 and 3 of the
piece 1 as shown in FIG. It is for pressing on the inner surfaces 2a and 3a.
[0028]
In this embodiment, a cylindrical adjustment nut 23 having an internal thread screwed to the
external thread shaft 21 is used as the pressure application means 22.
[0029]
Further, in this embodiment, the pressing elements 24, 24 are cylindrical bodies, and their
respective axes are parallel to the thickness direction of the legs 2 and 3 (the direction
orthogonal to the paper surface) as shown in FIG. It abuts on the inner surfaces 2a, 3a of the legs
2, 3.
In the following description, the direction of the pressing element 24 in this contact state may be
referred to as a “specific direction”.
[0030]
As shown by the cross section in FIG. 1, the pressing element 24 is provided with a recess 24 a
into which the tip of the adjustment nut 23 is fitted.
[0031]
The recess 24a is a circular recess into which the cylindrical portion of the adjustment nut 23 is
rotatably fitted. Therefore, even if the adjustment nut 23 is turned, the pressing element 24 can
be oriented in the above-mentioned specific direction.
[0032]
Here, with the distance between the side surface of the housing 12 and the pressing element 24
as the length of the support arm 20 for the sake of convenience, in order to attach the tactile
microphone 10A between the legs 2 and 3 of the piece 1, an adjustment nut After shortening the
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length of the support arm 20 by rotating the arm 23 in a direction approaching the housing 12,
the tactile microphone 10A is disposed between the legs 2 and 3 of the block 1 as shown in FIG.
[0033]
Then, with each pressing element 24 oriented in the above specific direction, the adjustment nut
23 is turned in a direction away from the housing 12 to lengthen the length of the support arm
20, and thereby pressing each pressing element 24 into the legs 2, The inner surfaces 2a and 3a
of 3 are brought into contact with a predetermined pressure.
[0034]
As a result, the tactile microphone 10A is fixed in a stretched state between the legs 2 and 3, and
when a string (not shown) is repelled, its vibration is transmitted from the piece 1 to the inside of
the microphone body 11 via the support arms 20 and 20. The voltage transmitted to the
piezoelectric element 12 a and generated by the piezoelectric element 12 a is applied to a
reproduction device (not shown) or the like via the output cable 15.
[0035]
Since each pressing element 24 is a cylindrical body, it contacts linearly with the inner surfaces
2a and 3a of the legs 2 and 3 and the pressure per unit area decreases.
Therefore, the piece 1 is not deformed or scratched, and it is used for a long time, and even if it
receives vibration due to the performance of the instrument, almost no slack or deviation occurs,
and the sound quality changes during the performance of the instrument. There is no
[0036]
In order to remove the tactile microphone 10A, the length of the support arm 20 may be
shortened by turning the adjustment nut 23 in the direction approaching the housing 12.
[0037]
In the above embodiment, each pressing element 24 is formed into a cylindrical body as a whole,
but at least a portion in contact with the inner surfaces 2a and 3a of the leg portions 2 and 3 of
the piece 1 may have an arc surface.
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[0038]
Also, as in the prior art, only one of the support arms may have a variable length, and the other
support arm may have a fixed length.
In addition, as another aspect of the pressure applying means, a compression coil spring may be
interposed between the housing 11 and the pressing element 24.
The tactile microphone 10A described in the above embodiment is suitable for contrabass, but
may be applied to other stringed instruments.
[0039]
10A String microphone 1 piece (bridge) 2, 3 legs 2a, 3a Leg inner surface 11 microphone body
12 housing 12a piezoelectric element 15 output cable 20 support arm 21 male screw shaft 22
pressure applying means 23 adjustment nut 24 pressing Child
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