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JP2006148325

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DESCRIPTION JP2006148325
To provide a boundary microphone capable of preventing the generation of noise without being
affected by an electromagnetic wave even when, for example, a mobile phone is placed by. A
boundary plate 1 which can be placed on a flat surface, a cover 2 which has an opening through
which sound waves can be introduced and which covers the boundary plate 1, a boundary plate
1 and a cover 2 are formed. The microphone unit 3 is disposed in the internal space formed by
the opening of the cover 2 and is disposed in the internal space formed by the boundary plate 1
and the cover 2. The circuit board 4 is characterized in that the mounting surface of the circuit
component 5 is on the boundary plate 1 side. [Selected figure] Figure 1
バウンダリーマイクロホン
[0001]
The present invention relates to, for example, a boundary microphone used by being disposed on
a desk surface or the like, and in particular, it is devised to be able to effectively prevent the
generation of noise due to an electromagnetic wave from the outside.
[0002]
A microphone installed and used on a flat surface such as a desktop is called a boundary
microphone.
The boundary microphone is designed to have a flat appearance with a reduced height in order
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to make it inconspicuous that it is installed on a desk or the like. FIG. 2 shows an example of a
conventional boundary microphone, in which a boundary plate 1, a cover 2, a microphone unit 3
and a circuit board 4 are main components. The boundary plate 1 is, for example, a flat member
formed by die casting and can be installed on a flat surface such as a desk top. The cover 2 is
made of, for example, a punching plate, has a plurality of openings through which sound waves
can be introduced, and covers the boundary plate 1. An internal space is formed between the
boundary plate 1 and the cover 2, and the circuit board 4 is disposed and fixed so as to divide the
internal space into upper and lower parts. The microphone unit 3 is attached to the circuit board
4 on the upper surface, that is, the surface on the cover 2 side.
[0003]
The microphone unit 3 is disposed in an internal space formed by the boundary plate 1 and the
cover 2 and detects sound waves introduced from a plurality of openings formed in the cover 2
and converts them into electric signals. The circuit board 4 has a circuit pattern formed on the
upper surface side, that is, the arrangement side of the microphone unit 3, and the circuit
component 5 is mounted on the arrangement side of the microphone unit 3. The cover 2 is
integrally attached to the boundary plate 1 by screwing a screw 6 passed through a hole of the
cover 2 into a pillar or the like of the boundary plate 1 while the cover 2 is in contact with the
upper surface of the boundary plate 1 It is attached. Assuming that the sound wave introduction
side of the microphone unit 3 is the front side, the cord bush 7 is fitted to the rear of the
boundary plate 1, the microphone cord 8 is pulled through the center hole of the cord bush 7,
and the electric signal converted by the microphone unit 3 Is output to the outside.
[0004]
As described above, the boundary microphone mainly includes the boundary plate 1 as a base
part and a cover 2 including a punching plate having a plurality of openings for introducing
sound waves. Usually, the appearance is not good when many screws are visible in appearance,
so insert the screw 6 into the hole provided approximately at the center of the cover 2 and screw
this screw 6 into the columnar projections of the boundary plate 1 etc. 2 is coupled to the
boundary plate 1; A shield is configured by the cover 2 and the boundary plate 1. A circuit board
4 incorporating a microphone unit 3, an impedance converter, a sound quality adjustment circuit,
an output circuit, etc. is fixed in a space enclosed by the shield. There is.
[0005]
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The cover 2 is usually processed into a predetermined shape by pressing a punching metal
provided with a large number of openings in an iron plate, but mechanical processing of the
cover 2 and the boundary plate 1 Also, the shape of the electrical contact portion tends to be
irregular. Further, although the boundary plate 1 is formed into a predetermined shape by using
a zinc die casting method or the like, the casting surface is not flat. Therefore, the connection of
the two parts consisting of the cover 2 and the boundary plate 1 is in point contact with several
points, and the electrical contact is not good.
[0006]
In the past, even if the shield structure of the boundary microphone used in a broadcasting
station where relatively strong VHF and UHF electromagnetic waves are scattered is the same as
the conventional shield structure, interference due to the electromagnetic waves can be
sufficiently prevented. However, if there are many mobile phones in close proximity due to the
spread of mobile phones as in recent years, the use of mobile phones near the microphones is
also increased, and the microphones are often affected by electromagnetic waves from the
mobile phones. It is coming. The radio waves used in mobile phones have high frequencies, and
when the mobile phone, which is a high frequency electromagnetic wave source, is placed by the
boundary microphone, the conventional shield structure prevents the generation of noise due to
the electromagnetic waves from the mobile phone. I could not.
[0007]
With regard to such a boundary microphone, the applicant has made a microphone unit support
piece cut and raised from a microphone base (corresponding to the above boundary plate) in
order to fix the microphone unit, the support piece and the microphone unit And a pressuresensitive adhesive sheet having elasticity for fixing the microphone unit to the support piece
interposed therebetween, and a configuration has been proposed (see, for example, Patent
Document 1). The invention described in Patent Document 1 aims to make it possible to reduce
the thickness and to make it difficult for unnecessary vibration to be input, and is not intended to
shield electromagnetic waves from mobile phones nearby. .
[0008]
Japanese Utility Model Publication 7-43015
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[0009]
The applicant has also proposed a structure in which an elastic, multiple contact point holding
part is sandwiched between the cover and the boundary plate.
However, even if such a structure is employed, the impedance to the high frequency of the
portion of the cover made of the punching plate can not be lowered sufficiently, and as can be
seen from FIG. 2, the circuit disposed on the upper surface of the circuit board 4 Since the
component 5 is close in size to the cover 2, when the mobile phone is brought close to the cover
2, the high-frequency current which is slightly intruded is detected by the circuit component 5
made of a semiconductor and generates noise. .
[0010]
As shown in FIG. 2, the boundary microphone generally incorporates the circuit board 4 and,
from the ease of component mounting, a cover on the upper surface of the circuit board 4, that
is, the side opposite to the boundary plate 1. The circuit component 5 is mounted on the surface
on the side 2 For example, a large part such as an electrolytic capacitor has a distance of several
mm between this part and the cover 2 and is close to the cover 2. When the mobile phone
approaches the cover 2, the electric parts pick up electromagnetic waves and noise Cause.
[0011]
The present invention solves the problems of the conventional boundary microphones described
above, and can prevent the generation of noise without being affected by the electromagnetic
waves even if, for example, a mobile phone is placed next to it. It aims at providing a boundary
microphone.
[0012]
The present invention is disposed in an inner space formed by a boundary plate which can be
placed on a plane, a cover which has an opening through which sound waves can be introduced
and which covers the boundary plate, a boundary plate and the cover. A microphone unit for
converting an acoustic wave introduced from the opening of the cover into an electric signal, and
a circuit board disposed in the internal space formed by the boundary plate and the cover and on
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which the microphone unit is disposed; The above-mentioned circuit board is mainly
characterized in that the mounting surface of the circuit component is on the above-mentioned
boundary plate side.
[0013]
Since the circuit component mounting surface of the circuit board is on the boundary plate side,
the circuit components are separated (far) from the cover, and even if a high frequency source
such as a mobile phone is brought close to the cover, the circuit components Is less susceptible
to high frequencies and can prevent the generation of noise due to high frequency
electromagnetic waves.
In addition, a ground pattern is formed over a wide area of the circuit board, and another circuit
pattern is formed, so that the electromagnetic wave entering from the cover side is blocked by
the circuit pattern of the circuit board and the electromagnetic wave reaches the circuit
components. Can be blocked more effectively.
[0014]
Hereinafter, an embodiment of a boundary microphone according to the present invention will be
described with reference to the drawings.
The parts corresponding to the components of the conventional example shown in FIG.
[0015]
In FIG. 1, the boundary microphone mainly includes the boundary plate 1, the cover 2, the
microphone unit 3, and the circuit board 4. The boundary plate 1 is, for example, a flat member
processed by a die-casting method using zinc as a material, and can be installed on a flat surface
such as a desktop. The cover 2 is made of, for example, a punching plate, has a plurality of
openings through which sound waves can be introduced, and covers the boundary plate 1. An
internal space is formed between the boundary plate 1 and the cover 2, and the circuit board 4 is
disposed and fixed so as to divide the internal space into upper and lower parts. The lower space
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divided by the circuit board 4 is represented by the reference numeral 11 and the upper space is
represented by the reference 12. The microphone unit 3 is attached to the circuit board 4 on the
upper surface, ie, the surface on the cover 2 side, and the microphone unit 3 is disposed in the
upper space 12 of the internal space formed by the boundary plate 1 and the cover 2. ing.
[0016]
The microphone unit 3 detects sound waves introduced from a plurality of openings formed in
the cover 2 and converts the sound waves into electric signals. The circuit board 4 has a circuit
pattern formed on the lower surface side, that is, on the side opposite to the arrangement side of
the microphone unit 3, and the circuit component 5 is mounted on the opposite side to the
arrangement side of the microphone unit 3. It is located in the lower space 11. The cover 2 is
screwed into a columnar projection 14 integrally formed on the boundary plate 1 with the screw
6 passed through the hole of the cover 2 in a state where the cover 2 is in contact with the upper
surface of the boundary plate 1. It is integrally attached to the boundary plate 1. Assuming that
the sound wave introduction side (left side in FIG. 1) of the microphone unit 3 is the front side,
the cord bush 7 is fitted to the rear of the boundary plate 1 and the microphone cord 8 is pulled
through the center hole of the cord bush 7. The electric signal converted in the above is output to
the outside.
[0017]
According to the embodiment described above, the circuit component mounting surface of the
circuit board 4 is on the boundary plate 1 side, and the circuit component 5 is far away from the
cover 1. Even if the high frequency generation source is brought close, the circuit component 5 is
not easily influenced by the high frequency, and the generation of noise caused by the high
frequency electromagnetic wave emitted from the mobile phone can be prevented. Further, since
the ground pattern is formed over a wide area of the circuit board 4 and another circuit pattern
is also formed, the electromagnetic wave entering from the cover 2 side is blocked by the circuit
pattern of the circuit board 4 and the electromagnetic wave is a circuit component It is possible
to block 5 more effectively.
[0018]
Since the circuit component 5 is mounted on the lower surface in FIG. 1, most of the circuit
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patterns electrically connecting the circuit components are formed on the lower surface side of
the circuit substrate 4. The circuit pattern includes a ground pattern, but as described above, the
circuit pattern connecting the circuit components can be formed on the lower surface side of the
circuit board 4, and the ground pattern can be formed on the upper surface side of the circuit
board 4. The upper surface side of the circuit board may be a space for arranging the
microphone unit 3 or a soldering land, and most of the other space is a vacant space. It is
preferable to form a ground pattern on almost the entire surface on the opposite side. If a ground
pattern is formed on almost the entire surface of the circuit board 4, this ground pattern
functions as a shield plate, so that high frequency electromagnetic waves entering from the cover
2 side are shielded by the ground pattern and surely reach the circuit component 5. It can be
blocked. This can effectively prevent the generation of noise.
[0019]
A substantially entire surface of the upper surface side of the circuit board 4 may be a ground
pattern as described above, or a circuit pattern for electrically connecting circuit components
may be formed on the lower surface side and the upper surface side. That is, circuit patterns may
be formed on both sides of the circuit board 4. Also in this case, the circuit pattern exhibits a
shielding effect, and the circuit pattern cuts off an electromagnetic wave that is about to enter
the circuit component 5 from the outside. In any case, the circuit component 5 is mounted on the
surface of the circuit board 4 on the boundary plate 1 side.
[0020]
The boundary microphone according to the present invention can be used as a sound collection
microphone in a broadcasting station, a conference room or the like.
[0021]
FIG. 1 is a side sectional view showing an embodiment of a boundary microphone according to
the present invention.
It is side surface sectional drawing which shows the example of the conventional boundary
microphone.
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Explanation of sign
[0022]
1 boundary plate 2 cover 3 microphone unit 4 circuit board 5 circuit parts
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