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JP2008072545

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DESCRIPTION JP2008072545
An object of the present invention is to reliably prevent the penetration of high frequency current
into a microphone due to a strong electromagnetic wave emitted from a cellular phone or the like
while having a simple structure and assembly. A 3-pin type output connector in which a first pin
E for grounding, a second pin SH for signal, and a third pin SC are provided in a connector base
11 is three pins E and SH. , SC, and the printed wiring board 100 consisting of a double-sided
board disposed on the base inner surface 11a side of the connector base 11, and on the upper
surface 101 of the printed wiring board 100, the second pin SH and the third pin SC. On the
other hand, a shield layer 120 consisting of a solid pattern of copper foil which is nonconductive
and conductive with the first pin E is formed over almost the entire surface of the upper surface
101 of the substrate. The filter circuit including the capacitor element 131 for preventing the
intrusion into the microphone case forms a 130, and the pin insertion holes of the printed wiring
board 100 are eccentrically arranged to the corresponding pins. To. [Selected figure] Figure 4
Microphone output connector
[0001]
The present invention relates to a microphone output connector, and more particularly to a
technique for preventing high frequency electromagnetic waves generated from, for example, a
portable telephone from entering into a microphone case from an output connector by an output
connector for a condenser microphone. is there.
[0002]
01-05-2019
1
The condenser microphone incorporates an impedance converter such as a FET (field effect
transistor) because the impedance of the microphone unit is extremely high.
Usually, a phantom power supply is used in a condenser microphone, and a microphone sound
signal is output to a mixer or the like via a balanced shield cable for phantom power.
[0003]
In order to connect the balanced shield cable, a 3-pin type output connector is provided on the
side of the microphone case (the microphone grip in the case of a handheld microphone) (see, for
example, Patent Document 1). The above-mentioned output connector is a connector defined in
EIAJ RC-5236 "Latch lock type round connector for audio equipment", and the configuration
thereof will be described with reference to Figs.
[0004]
7 is a sectional view showing the output connector mounted in the microphone case, FIG. 8 is a
front view showing the output connector extracted from the microphone case, and in FIG. 7 the
output connector is taken along the line B-B in FIG. It is shown in cross section. FIG. 9 is a plan
view of the output connector.
[0005]
According to this, the output connector 10 is provided with a disk-like connector base 11 made
of an electrical insulator such as PBT (polybutadiene terephthalate) resin. In the connector base
11, three pins, ie, a first pin E for grounding, a second pin SH on the hot side of the signal, and a
third pin SC on the cold side of the signal are inserted, for example, by press fitting.
[0006]
Referring to the hand-held microphone, as shown in FIG. 7, the output connector 10 is mounted
within a connector housing 20 which is screwed to the end of the microphone grip. Usually, the
01-05-2019
2
microphone grip including the connector housing cylinder 20 is made of a metal material such as
brass and also functions as a shield case of the built-in electric parts.
[0007]
In the connector base 11, a male screw 12 for electrically connecting a first pin E for grounding
to the connector housing cylinder 20 is provided. The male screw 12 is housed in a screw
housing hole 13 drilled in the radial direction of the connector base 11, and a female screw 14 a
screwed with the male screw 12 in the screw housing hole 13 in the connector base 11. A
ground terminal plate 14 is provided.
[0008]
As shown in the plan view of FIG. 9, the ground terminal plate 14 and the first pin E for
grounding are electrically connected through the connection fitting 15. As shown in FIG. 7, the
male screw 12 is rotated by a driver (not shown) from a circular hole 21 formed in the connector
housing cylinder 20 to abut the male screw 12 on the periphery of the circular hole 21.
[0009]
As a result, the first pin E for grounding and the connector housing cylinder 20 are electrically
connected through the male screw 12, the ground terminal plate 14 and the connection fitting
15. Further, separately from this, as shown in FIGS. 8 and 9, a plate spring 16 in contact with the
inner surface of the connector housing cylinder 20 is connected to the first pin E for grounding.
Conductivity of E and the connector storage cylinder 20 may be taken.
[0010]
When a strong electromagnetic wave is applied to the microphone or the microphone cable in a
state where a microphone cable (balanced shield cable) drawn from the phantom power supply
side (not shown) is connected to the output connector 10, the electromagnetic wave is
transmitted from the output connector 10 to the inside of the microphone And may be
demodulated by an impedance converter and output from the microphone as audio frequency
noise.
01-05-2019
3
[0011]
Conventionally, as one of the methods for preventing the penetration of electromagnetic waves
from the output connector 10 into the inside of the microphone, conventionally, between the first
pin E for grounding and the second pin SH on the hot side, and the first for grounding Capacitor
elements that operate to short the high frequency are connected between the pin E and the 3rd
pin SC on the cold side, and the 2nd pin SH on the hot side and the 3rd pin SC on the cold side
are blocked from high frequency intrusion It connects with microphone cases, such as the
connector storage cylinder 20, via the inductor element for these.
[0012]
According to this, it is possible to prevent the intrusion of a normal broadcast radio wave, for
example, an electromagnetic wave by HF, VHF, UHF, etc. with almost no problem.
However, with the widespread use of portable telephones and the like in recent years, the
opportunity for higher frequency electromagnetic waves to be used in the vicinity of the
microphone has increased, and this type of high frequency electromagnetic waves may not be
effective.
[0013]
That is, although three pins E, SH and SC are provided through the output connector 10, there is
an unshielded portion between the pins and the pin to which the electromagnetic wave intrudes.
Further, since the portion of the output connector 10 to be grounded to the connector housing
cylinder 20 is the leaf spring 16 attached to the fixing male screw 12 and / or the first pin E for
grounding, the contact portion is a high frequency Impedance and not sufficiently grounded in
high frequency.
[0014]
Therefore, even if a capacitor element and an inductor element are connected as described above
to form a filter circuit that blocks high frequency, a sufficient effect may not be obtained for high
frequencies used in mobile phones and the like. .
01-05-2019
4
[0015]
Further, the capacitor element included in the filter circuit operates to pass high frequency
current well.
For this reason, if the capacitor element is in the shield of the microphone, a high frequency
current flows to the capacitor element to induce a high frequency current in peripheral parts and
a circuit pattern, which is not preferable.
[0016]
In addition, the capacitor has a maximum rated voltage, and when the voltage is applied beyond
this, the capacitor is destroyed. A completely destroyed capacitor loses its function as a capacitor,
but if the degree of destruction is low, the function of the capacitor is maintained to some extent,
which may cause noise as a new cause.
[0017]
Therefore, the applicant of the present invention has previously filed an application for an output
connector of a microphone that solves the above problem (see Patent Document 2). The output
connector of the microphone described in Patent Document 2 includes a printed wiring board
disposed on the connector base and a shield cover that covers the printed wiring board, and the
printed wiring board is a double-sided board and copper foil on the lower surface side of the
board. The capacitor element for preventing high frequency intrusion and the Zener diode
element for preventing circuit breakdown due to static electricity are mounted in parallel on the
upper surface side of the substrate, and almost the entire upper surface of the substrate is
shielded. The structure of being covered by the cover is adopted.
[0018]
According to this configuration, each of the three pins provided through the connector base is
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5
electromagnetically shielded by the shield layer of the printed wiring board. A capacitor element
for preventing high frequency intrusion and a zener diode element for preventing circuit
breakdown due to static electricity are mounted in parallel on the upper surface (component
mounting surface) of the printed wiring board, but the component mounting surface is on the
shield cover Because it is covered, it is prevented that the high frequency is radiated to the inside
of the microphone from the wiring to the capacitor. Also, the capacitor element can be protected
from electrostatic breakdown by the Zener diode element.
[0019]
However, since the shield cover which covers the upper surface side which is a component
mounting surface of a printed wiring board is required, the cost for that is first incurred. Also, for
example, when the design specification is old and it is difficult to change the 3-pin plug, or when
it is necessary to use a designated connector, the configuration of the microphone output
connector described in Patent Document 2 is applied. There are things I can not do. In such a
case, a new mold will be created to make a compatible connector, which is uneconomical and not
preferable.
[0020]
JP 11-314583 A JP 2005-311752 A
[0021]
Therefore, it is an object of the present invention to provide a low cost microphone which is
capable of reliably preventing the penetration of high frequency current into the microphone due
to the strong electromagnetic wave emitted from the portable telephone etc while having a
simple structure and assembly. To provide an output connector.
[0022]
In order to solve the above problems, the invention according to claim 1 is a three-pin connector
in which a first pin for grounding, a second pin for signal, and a third pin are inserted through a
connector base made of an electrical insulator. In the output connector of the microphone type,
the three pins are inserted through the output connector of the microphone mounted in a state
where the first pin is conducted to the microphone case in the end of the conductive microphone
case of the condenser microphone. The printed circuit board is disposed on the inner surface of
the base facing the inner side of the microphone case of the connector base, and the printed
wiring board is a double-sided board on the upper surface of the substrate opposite to the inner
01-05-2019
6
surface of the base. A shield layer consisting of a solid pattern of copper foil which is
nonconductive to the second and third pins and conductive to the first pin is formed over
substantially the entire upper surface of the substrate, A filter circuit including a capacitor
element for preventing high frequency current from invading into the microphone case is formed
on the lower surface of the substrate facing the inner surface of the table, and a pin insertion
hole is formed in the printed wiring board. It is characterized in that it is eccentrically arranged
with respect to the corresponding pin.
[0023]
According to the second aspect of the present invention, the first pin insertion hole for the first
pin, the second pin insertion hole for the second pin, and the third pin for the third pin are
formed in the printed wiring board. The pin insertion holes are all the same diameter holes
having a diameter larger than that of each of the pins, and the difference between the radius of
each of the pin insertion holes and the radius of each of the pins is Δt. Any one of the pin
insertion holes is eccentrically disposed in the first direction by at least the difference Δt with
respect to the corresponding pin, and the remaining two pin insertion holes correspond to the
corresponding pins. It is characterized in that it is disposed eccentrically in the second direction
opposite to the direction of 1 by at least the difference Δt.
[0024]
According to the third aspect of the present invention, the third pin insertion hole is disposed
eccentrically at least by the difference Δt toward the center side or the anti-center side of the
connector base with respect to the third pin. The first pin insertion hole and the second pin
insertion hole correspond to the first pin and the second pin corresponding to the first pin
insertion hole and the second pin insertion hole in the opposite direction to the third pin
insertion hole by at least the difference Δt. It is characterized by being.
[0025]
According to the invention as set forth in claim 1, a shield layer consisting of a solid pattern of
copper foil is formed on the upper surface of the substrate opposite to the inner surface of the
base of the connector base of the printed wiring board consisting of a double-sided substrate, By
forming a filter circuit including a capacitor element for preventing high frequency current from
invading the inside of the microphone case on the lower surface of the substrate facing the inner
surface, three printed wiring boards are implanted in the connector base The capacitor element
is disposed outside the shield of the microphone by the shield layer on the upper surface side of
the substrate without separately providing a shield cover only by inserting and attaching to the
pin of the microphone. The high frequency current flowing to the capacitor element does not
flow into the capacitor element due to the electromagnetic wave, thereby suppressing the
01-05-2019
7
generation of noise.
[0026]
In addition, since it is not necessary to provide a separate shield cover, cost reduction can be
achieved, and for existing models with old design specifications where it is difficult to change 3pin plugs, the position of the pin plug It can respond only by perforating the pin insertion hole of
a printed wiring board according to.
[0027]
According to the second aspect of the present invention, the first pin insertion hole for the first
pin, the second pin insertion hole for the second pin, and the third for the third pin, which are
drilled in the printed wiring board. The pin insertion holes are all the same diameter holes having
a diameter larger than that of each pin, and the difference between the radius of each pin
insertion hole and the radius of each pin is Δt, any one of the first to third pin insertion holes
One pin insertion hole is arranged eccentrically by at least the difference Δt in the first direction
with respect to the corresponding pin, and the remaining two pin insertion holes are in the first
direction with respect to the corresponding pins By arranging the printed wiring board
eccentrically by at least the difference Δt in the reverse second direction, the printed wiring
board can be fixed at a predetermined position only by inserting the printed wiring board
through the three pins.
[0028]
In the connector specified in EIAJ RC-5236 “Latch lock type round connector for audio
equipment”, the 1st to 3rd pins are arranged at each vertex of the approximately isosceles
triangle, and the 3rd pin is the 1st and 2nd pins. According to the third aspect of the present
invention, the third pin insertion hole is directed toward the center side or the anti-center side of
the connector base with respect to the corresponding third pin. The first pin insertion hole and
the second pin insertion hole are disposed eccentrically by at least the difference Δt, and at least
the difference Δt in a direction opposite to the third pin insertion hole with respect to the first
and second pins corresponding to each other. By arranging the circuit board only eccentrically,
the printed wiring board can be stably fixed to the three pins.
[0029]
Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 6,
but the present invention is not limited to this.
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8
FIG. 1 is a front view showing an output connector 10A of a microphone according to the present
invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a plan view.
[0030]
The output connector 10A of the present invention is provided with a connector base 11 formed
in a disk shape from a synthetic resin such as PBT as a basic configuration as in the conventional
output connector 10 described with reference to FIGS. In the connector base 11, three pins, such
as a first pin E for grounding, a second pin SH on the hot side of the signal, and a third pin SC on
the cold side of the signal, are formed by press-fitting, for example.
[0031]
Further, the connector base 11 is provided with a male screw 12 for fixing the connector housing
portion 20 (see FIG. 7).
The male screw 12 is screwed with the female screw 14 a of the ground terminal plate 14 in a
screw receiving hole 13 drilled in the radial direction of the connector base 11.
The ground terminal plate 14 is erected on the connector base 11, and is electrically connected
to the first pin E for grounding via the connection fitting 15 as shown in FIG.
[0032]
According to the present invention, for example, the inner surface of the base of the connector
base 11 (a surface disposed on the inner side of the microphone) in order to prevent the
electromagnetic wave of high frequency radiated from the mobile phone from entering the inside
of the microphone (the inside of the microphone case). The printed wiring board 100 is disposed
on the side 11a.
[0033]
The printed wiring board 100 is attached to the output connector 10A by being inserted into the
01-05-2019
9
three pins E, SH and SC.
The printed wiring board 100 is a double-sided board, and the surface opposite to the base inner
surface 11a of the connector base 11 is the substrate upper surface 101, and the surface on the
side facing the base inner surface 11a is the substrate lower surface 102 in FIG. a) shows the
upper surface 101 of the substrate, and FIG. 4B shows the lower surface 102 of the substrate.
[0034]
Note that according to the third triangle method of drafting, the bottom view (bottom view) of
FIG. 4 (b) is vertically symmetrical with respect to the top view (plan view) of FIG. 4 (a). For
convenience, FIG. 4B is shown in perspective as seen from the side of FIG. 4A.
Moreover, the top view of the connector base 11 of the state which removed the printed wiring
board 100 in FIG.4 (c) is shown.
[0035]
As shown in FIGS. 4A and 4C, the printed wiring board 100 has three pin insertion holes, ie, a
first pin insertion hole 111 through which a first pin E for grounding is inserted, and a second
pin 2 on the hot side. A second pin insertion hole 112 through which the SH is inserted and a
third pin insertion hole 113 through which the third pin SC on the cold side is inserted.
Further, a terminal board insertion hole 114 for the ground terminal board 14 is also bored in
the printed wiring board 100.
[0036]
Referring to FIG. 4A, the shield layer 120 is made of copper on the upper surface 101 of the
printed wiring board 100, as indicated by the hatching, except around the second pin insertion
holes 112 and the third pin insertion holes 113. It is formed over almost the entire surface as a
solid pattern made of foil.
01-05-2019
10
[0037]
The shield layer 120 is not electrically connected to the second pin SH for signal and the third
pin SC, but enters through the first pin insertion hole 111 and the terminal plate insertion hole
114 by through hole plating and is grounded The first pin E of the second embodiment is
electrically connected to the ground terminal plate 14.
As described above, since the first pin E for grounding and the grounding terminal plate 14 are
electrically connected via the shield layer 120, the connecting fitting 15 shown in FIG. 9 may be
omitted.
In the second pin insertion hole 112 and the third pin insertion hole 113, through hole plating is
performed to ensure electrical continuity with the pins SH and SC for signals.
[0038]
Referring to FIG. 4 (b), a filter circuit that prevents high frequency current caused by external
electromagnetic waves or the like from invading the microphone case (not shown) through
output connector 10A on substrate lower surface 101 of printed wiring board 100. 130 are
provided.
[0039]
In this example, the filter circuit 130 includes the capacitor element 131 and the Zener diode
element 132 in parallel.
The filter circuit 130 is connected between the first pin E and the second pin SH and between the
first pin E and the third pin SC, as shown in the equivalent circuit of FIG.
[0040]
Zener diode element 132 is a capacitor from the rush current flowing from the 2nd pin SH and
3rd pin SC on the signal side to the 1st pin E side by applying strong electromagnetic waves to a
microphone cable (not shown) connected to output connector 10A. It is provided to protect the
element 131.
01-05-2019
11
[0041]
The printed wiring board 100 has the upper surface 101 as the upper side and the lower surface
102 as the lower side, the pin insertion holes 111, 112, 113 are inserted into the pins E, SH, SC,
and the terminal plate insertion hole 114 is grounded. By being inserted into the terminal plate
14, as shown in FIGS. 1 and 2, the connector base 11 is mounted at a predetermined position on
the base inner surface 11 a side.
[0042]
According to this, since the capacitor element 131 on the side of the lower surface 102 is
disposed outside the shield of the microphone by the shield layer 120 on the side of the upper
surface 101 of the substrate, inside the shield of the microphone The high frequency current
flowing to the capacitor element does not flow in, thereby suppressing the generation of noise
due to the external electromagnetic wave.
[0043]
Further, in the present invention, in order to enable the printed wiring board 100 to be fixed to
each of the pins E, SH, and SC without using fixing means such as screws and adhesives
separately, The positions of the corresponding pin insertion holes 111, 112, 113 are relatively
shifted.
[0044]
Since the positional relationship between each pin E, SH, SC and each pin insertion hole 111,
112, 113 is the same, referring to FIG. 5, the second pin SH and the corresponding second pin
insertion hole 112 are taken as an example. Explain.
[0045]
As shown to Fig.5 (a), in this invention, the 2nd pin penetration hole 112 is formed larger
diameter than 2nd pin SH.
The radius of the second pin SH is R1, the radius of the second pin insertion hole 112 is R2, and
the difference (R2-R1) is .DELTA.t, as shown in FIG. 5B, at the center point C1 of the second pin
SH. On the other hand, the center point C2 of the second pin insertion hole 112 is offset by at
01-05-2019
12
least Δt, and the second pin insertion hole 112 is brought into contact with the second pin SH.
[0046]
The printed wiring board 100 is fixed (held) to each pin E, SH, SC by the frictional force
generated by this contact, but one pin insertion hole and the remaining two pins of the three pin
insertion holes The shifting direction is opposite to the insertion hole.
[0047]
Since this output connector 10A is a connector defined in EIAJ RC-5236 "Latch lock type round
connector for audio equipment", as shown in FIG. 4 (c), the first pin E and the second pin SH The
third pin SC is disposed at each vertex of the substantially isosceles triangle, and the third pin SC
is disposed approximately halfway between the first pin E and the second pin SH.
[0048]
Therefore, as shown in FIG. 3, the third pin insertion hole 113 is disposed eccentrically at least
by the difference Δt toward the opposite center side (radial direction outer side) of the
connector base 11 with respect to the corresponding third pin SC. On the other hand, the first
pin insertion hole 111 and the second pin insertion hole 112 are at least 180 ° opposite to the
third pin insertion hole 113 with respect to the corresponding first pin E and second pin SH. It is
preferable to arrange eccentrically by the difference Δt.
[0049]
According to this, since the pin insertion holes 111, 112, 113 contact the respective pins E, SH,
SC in a well-balanced manner, a stable fixed state can be obtained.
In order to make the electrical and mechanical connection more reliable, the pins E, SH, and SC
and the through-hole plating in the pin insertion holes 111, 112, and 113 may be soldered.
[0050]
According to the present invention, the microphone of the high frequency current caused by the
strong electromagnetic wave radiated from the portable telephone and the like can be obtained
01-05-2019
13
simply by adding the printed wiring board 100 having the above-mentioned configuration
without changing the basic configuration of the output connector. It is possible to reliably
prevent the intrusion.
Further, the printed wiring board 100 can be securely attached to the output connector by a
simple operation.
[0051]
The front view which shows an example of the output connector by this invention.
A-A line sectional view of FIG.
FIG. 2 is a plan view of FIG. 1;
(A) Top view of printed circuit board, (b) Bottom view of printed circuit board, (c) Top view of
connector base.
(A) Explanatory drawing which shows the relationship of the magnitude | size of a pin and a pin
insertion hole, (b) Explanatory drawing which shows the state which made the pin insertion hole
eccentric with respect to a pin.
The equivalent circuit schematic containing the capacitor | condenser element and zener diode
which are provided between each pin of an output connector.
Sectional drawing shown in the state which mounted the conventional output connector in the
connector accommodating part.
The front view which shows the conventional output connector.
01-05-2019
14
The top view which shows the conventional output connector.
Explanation of sign
[0052]
Reference Signs List 10A output connector 11 connector base 11a base inner surface 12 male
screw for fixing 14 ground terminal board 20 connector housing part 100 printed wiring board
101 upper surface of substrate 102 lower surface of substrate 111, 112, 113 pin insertion hole
120 shield layer 130 filter circuit 131 Capacitor element 132 Zener diode E Pin 1 for grounding
SH Hot pin 2 Pin SC Cold pin 3
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