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JP2002281582

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DESCRIPTION JP2002281582
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
microphone for stably leading a lead of an acousto-electrical conversion element for converting a
change in sound pressure into an electrical change, leading it out of the case, and holding the
microphone.
[0002]
2. Description of the Related Art FIG. 4 is a longitudinal sectional view showing the configuration
of a stereo microphone as a conventional microphone. In the figure, the case 10 has a cylindrical
side wall in which a large number of holes are formed so as to allow sound to pass, and one end
of this side wall, that is, a disk shape in which a large number of holes are similarly formed at the
upper end of the drawing. End wall 10a is mounted. In this case, the projection projecting from
the end of the side wall is bent through the slit-like hole formed in the end wall 10a, whereby the
side wall and the end wall are integrated to form the case 10. A protrusion is also formed on the
other end of the side wall of the case 10, that is, the lower end of the drawing, and the protrusion
is bent through a slit-like hole formed in the substrate 12 such as a wiring substrate. It is
attached to.
[0003]
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1
Inside the case 10, an upper floating member 8 and a lower floating member 9 as holding
members are axially spaced apart from each other. The upper floating member 8 and the lower
floating member 9 are each formed by annularly forming a viscous or elastic material (also
referred to as a visco-elastic material) such as rubber, and the projections 8a and 9a formed on
the respective outer peripheral portions are cased. It is mounted in place by engaging holes
formed in the side walls of 10.
[0004]
Annular projections are respectively formed on the lower surface of the axial core portion of the
upper floating member 8 and the upper surface of the axial core portion of the lower floating
member 9, and an assembly element made of, for example, an injection molded article between
these annular projections. 7 is held. In this assembly element 7, two wedge-shaped mounting
parts are vertically connected so that their openings face the opposite diagonally upwards, and
the end integrally formed at the axial upper end is the upper floating member 8 The end portion
of the lower floating member 9 is supported by the annular projection of the lower floating
member 9 and is integrally formed at the lower end in the axial direction. The left microphone
unit 5 as an acoustic-electric conversion element is mounted on the upper mounting portion, and
the right microphone unit 6 as an acoustic-electric conversion element is mounted also on the
lower mounting portion. Therefore, the left microphone unit 5 mainly receives the left sound
indicated by the arrow L, and the right microphone unit 6 mainly receives the right sound
indicated by the arrow R.
[0005]
The lead wires 11 of the left microphone unit 5 and the right microphone unit 6 are spirally
wound around the assembly element 7 and are led downward from the axial core of the lower
floating member 9. These lead wires 11 are curved outward in the radial direction in the space to
the substrate 12 and are drawn out through the holes of the substrate 12 formed in the axial
core portion, and the base portion thereof is fixed by the fixing portion 4 made of solder or the
like For example, the lead-out end of another wire (not shown) connected to the ground wire is
connected to an amplifier or the like.
[0006]
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2
FIG. 5 is an enlarged perspective view showing the shape of the lead wire 11 drawn from the
axial core portion of the lower floating member 9. By bending this portion radially outward, the
extension force of the lead wire 11 is obtained. It is provided so as not to act directly on the
lower floating member 9 and the assembly element 7. In addition, it is made hard to receive to
the influence of tension ¦ tensile̲strength by arrange ¦ positioning four lead wires 11 shown in
figure to the circumferential direction equally.
[0007]
However, the process of distributing the plurality of lead wires 11 drawn from the axial core of
the lower floating member 9 in the circumferential direction to make it loose depends on the
manual work of the operator. The Therefore, in order to keep the lead wire 11 in a stable
position without touching the side wall of the case 10, and to equalize the amount of slack of the
lead wire 11 and the positioning thereof, a skilled worker is required. The shape of the
microphone varies depending on the skill level of the worker, and the variation with respect to
the minute vibration and noise of the microphone is large.
[0008]
The present invention has been made to solve the above-mentioned problems, and its object is to
provide a microphone capable of stabilizing its performance without depending on the level of
skill of the operator.
[0009]
According to the first aspect of the present invention, there is provided an acoustic-electric
conversion wherein a pair of holding members are axially spaced apart in a case having a
cylindrical side wall, and held between the holding members. In the microphone in which a
plurality of lead wires of the element are led out from the substantially axial core of the holding
member and are led out through the axial core of the end wall of the case, the holding member
and the end wall on the side where the lead is led The lead wire through holes, which are
mounted between them and on the same circumference centering on the axial center of the case,
and which bend the lead wire radially outward through the lead wire in the circumferential
direction by at least the number of lead wires. It is characterized in that a wiring holder formed at
substantially equally divided positions is provided.
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3
Thus, the performance can be stabilized without depending on the skill level of the worker.
[0010]
According to a second aspect of the present invention, in the microphone according to the first
aspect, the wiring holder has a slit which can introduce the lead wire from the outer edge to the
lead wire through hole radially outward of the lead wire through hole. It is characterized by being
equipped. This also has the effect of enabling rapid assembly.
[0011]
The invention according to claim 3 is characterized in that in the microphone according to claim
1 or 2, the wiring holder is formed of a viscoelastic material. This also has the effect of being able
to secure the degree of freedom of the lead wire with slack.
[0012]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be
described in detail below based on the preferred embodiments shown in the drawings. FIG. 1 is a
longitudinal sectional view showing the configuration of the first embodiment of the microphone
according to the present invention, and in the figure, the same elements as those in FIG. I omit it.
In this embodiment, the wiring holder 1 is mounted between the lower floating member 9 on the
side from which the lead wire 11 is led out and the substrate 12 as an end wall in the axial
direction when viewed from the case 10. The configuration is different from that of FIG. 4 in that
the lead wire 11 is passed through the lead wire through hole 2 and curved radially outward.
[0013]
Here, the wiring holder 1 is formed of a visco-elastic material such as rubber, and the inner
annular portion 1a and the outer annular portion 1b are disposed concentrically as shown in the
enlarged perspective view of FIG. The portions are joined by radially extending connecting
portions 1c at positions where the circumferential direction is divided into four equal parts, and a
ring-shaped wiring holder 1 is configured as a whole. Then, a lead wire through hole 2 through
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4
which the lead wire 11 can be passed in the axial direction is formed at the radial direction
intermediate portion of the connection portion 1c. The lead wire through hole 2 has a diameter
several times that of the lead wire 11 because it is necessary to allow the lead wire 11 to pass
loosely and allow room for bending. Furthermore, at each outer edge of the lead wire through
hole 2, a slit 3 is formed so that the lead wire 11 can be introduced from the radially outer side.
Therefore, in order to pass the lead wire 11 through the lead wire through hole 2, it is sufficient
to insert the lead wire 11 from the outside of the wiring holder 1.
[0014]
On the other hand, on the outer periphery of the outer annular portion 1b, projections 1d are
provided radially outwardly projecting at positions deviated about 45 degrees in the
circumferential direction from the connection portion 1c, and these projections 1d The wire
holder 1 is attached to the case 10 after passing through the lead wire 11 through the lead wire
through hole 2. Thus, on the same circumference centering on the axial center of the case 10,
moreover, the lead wire through holes 2 for passing the lead wires 11 one by one in the axial
direction are provided respectively at positions where the circumferential direction is equally
divided into four. By preparing the wire holder 1 configured and attaching it to the case 10
through the lead wire 11, the four lead wires 11 can be curved substantially equally, so that the
difference in the shape is caused by the worker. The problems with the conventional device are
eliminated. In the present embodiment, four lead wires are equally divided into four, but it is
natural that the number of equal parts can be increased or decreased according to the number of
lead wires. Furthermore, the division in the circumferential direction does not have to be exactly
equalized, but may be substantially equalized.
[0015]
Further, according to the above embodiment, since the slits 3 which can introduce the lead wire
11 from the outer side in the radial direction are formed at each outer edge of the lead wire
through hole 2, therefore, quick assembly is possible. . Furthermore, according to the abovedescribed embodiment, since the wiring holder 1 is formed of a viscoelastic material, slack can be
given to secure the freedom of the lead wire. The transmitted vibration can be attenuated.
[0016]
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5
FIG. 3 is a perspective view showing the configuration of a wiring holder 1A constituting a
second embodiment of the microphone according to the present invention. In the figure, the
same elements as in FIG. 2 are assigned the same reference numerals and explanations thereof
will be omitted. In this embodiment, the inner annular portion 1a and the outer annular portion
1b are circumferentials so that assembly can be performed in exactly the same manner as
described above even when the number of lead wires 11 led out from the microphone unit is
increased to eight. They are respectively joined by the connecting portion 1c at positions where
the direction is divided into eight equal parts, and an annular wiring holder 1A is configured as a
whole. Then, a lead wire through hole 2 through which the lead wire 11 can be passed in the
axial direction is formed at the radial direction intermediate portion of the connection portion 1c.
[0017]
According to the second embodiment, the number of the lead wires 11 derived from the
microphone unit is not limited to eight, and the number of the lead wires 11 may be four or only
two. Even if it can be shared by all. In each of the above embodiments, it is assumed that the
number of lead wires 11 derived from the lower floating member 9 is an even number, but in the
case of an odd number, the circumferential direction is equally divided according to the number.
The connection portions 1c may be provided, and the lead wire through holes 2 may be formed
in the intermediate portion in the radial direction.
[0018]
Furthermore, in each of the above-described embodiments, the slits 3 which can introduce the
lead wire 11 from the outer side in the radial direction are provided at each outer edge of the
lead wire through hole 2. Even if the slit 3 is not provided, the performance can be stabilized
without depending on the skill level of the worker.
[0019]
As apparent from the above description, according to the present invention, it is possible to
provide a microphone capable of stabilizing the performance without depending on the skill level
of the operator.
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