JP2006033463

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DESCRIPTION JP2006033463
PROBLEM TO BE SOLVED: In a two-way type condenser microphone which operates with either a
battery or a phantom power source, a battery cover provided in a battery storage portion is
securely grounded to prevent noise generation due to an external electromagnetic wave.
SOLUTION: A microphone housing 10 having a condenser microphone unit, a battery storage
portion 20 having one end supported by the microphone housing 10 and an output connector 40
at the other end, and a battery storage portion 20 are movably covered. In the condenser
microphone including the cylindrical battery cover 50 and the plug 60 detachably connected to
the output connector 40, when the plug 60 is connected to the output connector 40 on the
output connector 40 side, the plug 60 is grounded A conductive piece 80 is provided which is in
contact with the sleeve 61 elastically and is a flat spring pressed against the inner surface of the
battery cover 50 by the ground sleeve 61. [Selected figure] Figure 1
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 shield
structure in a two-way condenser microphone that operates with either a battery or a phantom
power supply.
[0002]
The condenser microphone incorporates an impedance converter because the impedance of the
microphone unit is extremely high.
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Usually, an FET (field effect transistor) is used for the impedance converter, but a rare vacuum
tube may be used for some, for example, for mania.
[0003]
In either case, the audio signal of the condenser microphone is output through the balanced
shield cable, but the connection with the balanced shield cable is as described in Patent
Document 1 for EIAJ RC-5236 "for audio equipment. The 3-pin type output connector defined in
the latch lock type round connector is used.
[0004]
In this 3-pin output connector, generally, the first pin is used as the ground, the second pin as the
hot side of the signal, and the third pin as the cold side of the signal.
In addition, as a thing marketed, the thing of Canon XLRM type corresponds to said 3 pin output
connector.
[0005]
In general, condenser microphones are used by being connected to the phantom power supply
via the above-mentioned balanced shield cable, but, for example, superdirective gun-type
condenser microphones, which are frequently used outdoors, are separated from the phantom
power supply. Some work with batteries such as AA.
[0006]
In this two-way type condenser microphone that operates with either the phantom power supply
or the battery, since the battery storage portion (battery holder) is provided in the shield case, a
cylindrical that can slide axially in a part of the shield case Battery cover is included.
[0007]
By the way, when a strong electromagnetic wave is applied to the microphone or the output
cable (the balanced shield cable), the electromagnetic wave is transmitted along the output cable,
enters the inside of the microphone from the output connector, and is demodulated by the
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impedance converter to generate audio frequency noise. It may be output from the microphone.
[0008]
If the shield is perfect, the penetration of electromagnetic waves is prevented, but since the
electrical connection at the output connector is mechanical contact, it is easy to have an
impedance at high frequencies, resulting in a problem of the penetration of electromagnetic
waves from the output connector. It becomes.
[0009]
Further, in a condenser microphone incorporating a battery, the output connector is supported
on the rear end side of the battery storage portion, and the battery storage portion is provided
with a cylindrical battery cover including the output connector.
However, since it is necessary to make the battery cover axially slidable at the time of battery
replacement, it is difficult to completely ground the output connector side, which causes
electromagnetic waves to intrude into the microphone and generate noise. There is.
[0010]
In particular, considerably strong electromagnetic waves (for example, electric field strength
reaching tens of thousands times the electric field strength generated in the market by
commercial radio waves in the range of several cm to several 10 cm) from mobile phones that
are rapidly spreading in recent years In the field of microphones, it is urgently required to take
measures against electromagnetic waves by mobile phones.
[0011]
Unexamined-Japanese-Patent No. 11-341583
[0012]
Therefore, an object of the present invention is to securely ground the battery cover provided in
the battery housing to prevent noise generation due to extraneous electromagnetic waves in a
two-way condenser microphone that operates with either a battery or a phantom power supply.
It is in.
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[0013]
In order to solve the above problems, the present invention is directed to a microphone housing
having a condenser microphone unit, a battery storage unit having one end supported by the
microphone housing and an output connector at the other end, and a movement relative to the
battery storage unit. A plug having a cylindrical battery cover made of a conductive material
electrically and mechanically connected to the microphone housing at a position where it can be
covered and closed, and the output connector having a grounding sleeve on the microphone
cable side In the condenser microphone which is detachably connected, when the plug is
connected to the output connector on the output connector side, the plug elastically contacts the
ground sleeve and the inner surface of the battery cover is formed by the ground sleeve. It is
characterized in that a conducting piece consisting of a plate spring to be pressed against is
provided.
[0014]
In the present invention, a cylindrical connector cover for housing the output connector is
provided on the other end side of the battery storage portion, and the conductive piece is a notch
formed along the axial direction of the connector cover Preferably, the conductive piece is
supported in a cantilever manner, and in this case, the conducting piece is further preferably
provided with a substantially U-shaped contact on its free end side.
[0015]
According to the present invention, as the plug on the microphone cable side is connected to the
output connector, the ground sleeve of the plug contacts the conducting piece consisting of a
plate spring and the conducting piece is pressed against the inner surface of the battery cover.
The battery cover is securely grounded via the plug's grounding sleeve.
Therefore, since the battery cover is at the ground potential and the entire microphone is viewed
as a whole, the shield including the microphone case is almost perfect, the penetration of the
electromagnetic wave into the microphone is blocked, and the generation of the noise due to the
electromagnetic wave is significant. Reduced.
[0016]
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Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 4,
but the present invention is not limited to this.
FIG. 1 is a cross-sectional view of a battery storage unit which is an essential part of a condenser
microphone according to the present invention, and FIG. 2 is an exploded view thereof.
Further, FIG. 3 is a cross-sectional view of the battery storage portion in a state in which the plug
is removed, and FIG. 4 is a cross-sectional view of the battery storage portion in a state in which
the battery cover is opened.
[0017]
First, referring to FIG. 1 and FIG. 2, the condenser microphone described here is a narrow
directivity gun microphone in which a condenser microphone unit is housed in an elongated
cylindrical microphone housing 10, as shown in FIG. Only the rear end portion of the elongated
cylindrical microphone housing 10 is shown, so the condenser microphone unit is also omitted.
[0018]
The microphone housing 10 is made of a conductive material such as aluminum or a brass alloy
in order to provide shielding against electromagnetic waves.
The present invention can also be applied to a condenser microphone in which a condenser
microphone unit and an output module unit (power module unit) including an audio output
circuit board in a shield case are connected by a microphone cord, such as a tie pin type
microphone, for example. Then, in that case, the shield case of the output module unit
corresponds to the microphone housing 10.
[0019]
At the rear end of the microphone housing 10, one end side (tip end side) 20a of the battery
storage portion (battery holder) 20 is fixed by screwing via a coupler ring 11 made of a
conductive material.
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The coupler ring 11 is provided with a male screw 11a on the rear end side of the outer
peripheral surface thereof.
For example, the battery storage portion 20 may have a bottom-like battery mounting recess 21
for storing one AA battery, and the whole may be formed of a synthetic resin.
Although not shown, positive and negative electrode terminals are provided at both ends of the
battery mounting recess 21, and necessary wiring is additionally provided.
[0020]
A cylindrical connector cover 30 made of a conductive material is screwed to the other end side
(rear end side) 20b of the battery housing portion 20, and the output connector 40 is housed in
the connector cover 30 and fixed by screwing.
An engagement groove 31 is formed at the rear end of the inner surface of the connector cover
30.
[0021]
For the output connector 40, a 3-pin type output connector defined in EIAJ RC-5236 "Latch-lock
type round connector for audio equipment" is used, and its No. 1 pin (ground pin) is a conductive
screw not shown. It is electrically connected to the connector cover 30 via the same.
[0022]
A battery cover 50 is placed on the battery storage unit 20.
The battery cover 50 is formed of a cylindrical body having substantially the same diameter as
the microphone housing 10, and a female screw 51 screwed with the male screw 11a of the
coupler ring 11 is formed on one end side (tip end side) of the inner surface.
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[0023]
That is, the battery cover 50 is connected to the coupler ring 11 by turning itself, for example,
clockwise, and becomes free by moving in a counterclockwise direction by turning it
counterclockwise, and the battery storage portion 20 can be moved. It can be opened.
[0024]
The battery cover 50 is made of a conductive material such as aluminum or brass alloy as the
microphone housing 10, and is included in a part of the shield case of the microphone integrally
with the microphone housing 10 at the closed position screwed to the coupler ring 11. Be
In this example, the battery cover 50 has a length that covers the battery storage unit 20 and the
connector cover 30.
[0025]
Referring also to FIG. 3, a plug 60 provided on the balanced shield cable 70 is detachably
connected to the output connector 40.
The plug 60 is provided with a ground sleeve 61 at a portion inserted into the connector cover
30. The ground sleeve 61 is connected to a shield covering wire (not shown) in the balanced
shield cable 70.
[0026]
In addition, a locking claw 62a which is projected and retracted by a knob 62 is provided in a
part of the ground sleeve 61, and the lock claw 62a is inserted into the engagement groove 31 of
the connector cover 30 when the ground sleeve 61 is inserted into the connector cover 30.
Engage. The engagement is released by pushing the knob 62.
[0027]
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In the present invention, in order to connect the plug 60 to the output connector 40, when the
ground sleeve 61 is inserted into the connector cover 30, a reliable electrical connection between
the ground sleeve 61 and the battery cover 50 can be obtained. For example, a conductive piece
80 made of a leaf spring material such as phosphor bronze is provided.
[0028]
As shown in FIG. 2, in this example, a notch 32 is formed in a part of the connector cover 30
along the axial direction, and the conductive piece 80 is cantilevered in the notch 32, that is, one
end side It is fixed by a screw etc. and the other end side is attached as free state.
[0029]
Further, in this example, only when the ground sleeve 61 is inserted into the connector cover 30,
the ground sleeve 61 and the connector cover 30 are electrically connected via the conductive
piece 80, and the battery cover 50 is removed when the plug 60 is removed. In order to make it
possible to turn the shaft without any trouble, a substantially U-shaped (or V-shaped) contact 81
is formed on the free end side of the conducting piece 80.
[0030]
In this example, when the contact 81 is inverted U-shaped and the plug 60 is not connected as
shown in FIG. 2, the inverted U-shaped top side is in the standby position projecting into the
connector cover 30. However, on the contrary, the contact 81 may be U-shaped.
[0031]
When this condenser microphone is used, the plug 60 is connected to the output connector 40
regardless of whether the power supply is required for the battery in the battery storage unit 20
or a phantom power supply as an external power supply.
[0032]
According to the present invention, the contactor 81 elastically contacts the ground sleeve 61 in
accordance with the connection, and the contactor 81 is pressed against the inner surface of the
battery cover 50 by the ground sleeve 61. Therefore, the battery cover 50 is grounded As a
result, the grounding of the microphone as a whole will be almost complete.
[0033]
Therefore, even if, for example, a cellular phone that generates strong electromagnetic waves, for
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example, is used nearby, the electromagnetic waves do not enter the inside of the microphone,
and therefore noise due to the electromagnetic waves hardly occurs.
[0034]
In order to open the battery storage unit 20 for battery replacement in the use state of FIG. 1, the
plug 60 is removed from the output connector 40 as shown in FIG. 3 prior to that, and the
battery cover 50 is counterclockwise in this example. Then, the screw engagement with the
coupler ring 11 is released, and as shown in FIG. 4, the battery cover 50 is moved in the right
direction in the figure to open the battery storage portion 20.
[0035]
As described above, since the plug 60 is removed at the time of battery replacement, noise due to
the battery replacement is not generated.
The circuit is configured so that if the phantom power is turned on with the battery inserted, the
phantom power is given priority.
Further, in the case of battery operation, the balanced shield cable 70 is connected to a mixer or
the like having no phantom power supply.
[0036]
Sectional drawing which shows the battery storage part of the capacitor ¦ condenser microphone
by this invention.
The disassembled figure of the said battery storage part.
Sectional drawing of the said battery storage part in the state which removed the plug.
Sectional drawing of the said battery storage part in the state which opened the battery cover.
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Explanation of sign
[0037]
DESCRIPTION OF SYMBOLS 10 Microphone housing 11 Coupler ring 20 Battery storage part 30
Connector cover 40 Output connector 50 Battery cover 60 Plug 61 Grounding sleeve 70
Balanced shield cable 80 Conduction piece 81 Contactor
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