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DESCRIPTION JP2015005837

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DESCRIPTION JP2015005837
PROBLEM TO BE SOLVED: To obtain a handset microphone capable of preventing noise mixing
due to switch operation and also capable of preventing malfunction. SOLUTION: This handset
microphone comprises a microphone unit, a first switch connected in parallel to the output end
of the microphone unit, and a second switch for opening and closing the output end, and the first
switch With the second switch, the contact is opened and closed by the influence of the magnetic
field, and when the first switch is affected by the magnetic field, the contact is closed to short the
output end, and the second switch By the handset microphone, the contacts are opened and
disconnected at the output end when affected. [Selected figure] Figure 1
ハンドセットマイクロホン
[0001]
The present invention relates to a handset microphone capable of preventing noise mixing due to
switch operation and also capable of preventing malfunction.
[0002]
Various types of microphones that pick up and output voice are known.
Among them, a microphone that can transmit when the transmission switch is operated and can
not transmit when the transmission switch is not operated is referred to as a handset microphone
(for example, see Patent Document) See 1). Generally, a push switch or the like is used as a
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transmission switch included in the handset microphone. When making the handset microphone
transmittable, the push switch is depressed, and the switch depressed state is maintained during
the transmission. On the other hand, when the transmission is ended, the push switch is returned
to the original state (state not pressed). In the push switch, the contact is mechanically opened
and closed.
[0003]
Mechanically operating the switch contacts is prone to noise when the contacts are interrupted.
In order to prevent such mixing of noise, it is preferable to use a reed switch in which a contact is
interrupted by moving a magnet attached to a switch knob instead of a contact by mechanical
operation.
[0004]
When the reed switch is used as an operation switch of the handset microphone, noise generated
at the time of start of transmission and operation of stop of transmission can be prevented.
However, since the reed switch operates the contact by the magnetic field, it may malfunction if
an extra magnetic field is applied from the outside.
[0005]
Handset microphones are often used in wireless communication devices, and often transmit radio
waves in conjunction with switch operation. In such a wireless communication device, when the
switch of the handset microphone malfunctions due to the external magnetic field, unnecessary
radio waves are transmitted.
[0006]
Patent No. 3857591 specification
[0007]
Therefore, an object of the present invention is to provide a handset microphone capable of
preventing noise mixing due to switch operation and also capable of preventing a malfunction.
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[0008]
The present invention relates to a handset microphone, and has a microphone unit, a first switch
for turning on / off the output of the microphone unit, and a second switch for switching the
microphone unit to an output enable state. The first switch and the second switch are reed
switches whose contacts are operated by a magnetic field, and the first switch opens the contacts
when affected by the magnetic field and is affected by the magnetic field. The main feature is that
the contact is closed and the output of the microphone unit is short-circuited, and the second
switch shorts the output of the microphone unit when affected by a magnetic field.
[0009]
According to the present invention, it is possible to prevent the mixing of noise due to the switch
operation and to prevent the malfunction.
[0010]
FIG. 1 is a circuit diagram illustrating an embodiment of a handset microphone according to the
present invention.
(A) A circuit diagram showing the state of operation preparation stage of the above-mentioned
handset microphone, (b) a circuit diagram showing a state when an external magnetic field is
applied during operation, (c) showing a state where an external magnetic field is applied during
operation FIG.
It is an example of the transmission switch with which the said handset microphone is provided,
Comprising: It is explanatory drawing which shows the state which the transmission switch is not
operate | moving, and the state which the transmission switch is operate | moving.
It is an example of the hook switch with which the said handset microphone is provided,
Comprising: It is explanatory drawing which shows the state which the hook switch is not
operate | moving, and the state which the hook switch is operate | moving.
[0011]
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Hereinafter, an embodiment of a handset microphone according to the present invention will be
described with reference to the drawings.
FIG. 1 is a circuit diagram showing a configuration of a handset microphone 100 according to
the present embodiment. As shown in FIG. 1, the handset microphone 100 includes a dynamic
microphone unit 30, a transmission switch 10 which is a first switch, and a hook switch 20 which
is a second switch.
[0012]
The voice transmission switch 10 is a reed switch having a mechanism in which the position of
the magnet changes in accordance with the operation of the operation unit (not shown) of the
handset microphone 100. When the operation unit is not operated, the contact portion of the
reed switch is influenced by the magnetic field from the magnet to magnetize the contact portion.
The contact of the transmission switch 10 is closed by the influence of the magnetic field. On the
other hand, the contact is opened when it is not affected by the magnetic field from the magnet.
That is, the transmission switch is a reed switch of the make contact.
[0013]
As shown in FIG. 1, the transmission switch 10 is connected in parallel to the output end of the
microphone unit 30. When the operation unit of the handset microphone 100 is not operated
(e.g., not pressed), the transmission switch 10 is such that the magnet approaches the contact
portion to exert the influence of the magnetic field. At this time, the contacts of the talk switch 10
are closed, and the output end of the microphone unit 30 is shorted.
[0014]
On the other hand, when the operation unit of the handset microphone 100 is operated (for
example, pressed), the magnet moves away from the contact portion. As a result, the contact
portion is not affected by the magnetic field, so the contact is opened. That is, when the operation
unit is operated, the output from the microphone unit 30 is output from the output end
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according to the state of the hook switch 20 described later.
[0015]
That is, the transmission switch 10 switches the output of the handset microphone 100 on and
off.
[0016]
The hook switch 20 is a reed switch of a transfer contact that switches from a normally closed
contact to a normally open contact when affected by a magnetic field.
FIG. 1 shows a state in which the hook switch 20 is affected by a magnetic field, that is, a state in
which the hook switch 20 is switched to a normally open contact. The magnetic field affecting
the hook switch 20 is provided, for example, by a magnet provided on the hook that secures the
handset microphone 100 when not in use.
[0017]
The handset microphone 100 has a wall hanging member in a housing (not shown). When the
handset microphone 100 is not used, the wall hanging member is hooked and fixed to a hook
which is a holding member previously fixed to the wall. The hook is provided with a magnet.
Under the influence of the magnetic field of the magnet, the hook switch 20 maintains the state
of switching to the normally open contact. That is, the output end of the handset microphone
100 is opened and closed by the hook switch.
[0018]
The wall hooking member provided in the housing of the handset microphone 100 is, for
example, a hole formed in a part of the housing. Also, in this case, the handset microphone 100
can be fixed by engaging a hook, which is a holding member, with the hole formed in the
housing.
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[0019]
That is, with the hook switch 20, the handset microphone 100 can switch the output enable
state. FIG. 1 shows a non-transmission state when the handset microphone 100 is not in use. At
this time, the output end of the microphone unit 30 is short-circuited by the transmission switch
10, and the normally closed contact of the hook switch 20 and the output end of the microphone
unit 30 are electrically disconnected. Therefore, the output signal from the microphone unit 30 is
not output.
[0020]
Next, the configuration of the transmission switch 10 will be described in detail. FIG. 3 is an
explanatory view showing an example of a reed switch used as the transmission switch 10. As
shown in FIG. FIG. 3A shows a state in which the transmission switch 10 is not in operation. FIG.
3 (b) shows the state in which the transmission switch 10 is operating.
[0021]
As shown in FIG. 3A, the transmission switch 10 has a structure in which two ferromagnetic
leads are enclosed in a glass tube 14 in a state of facing each other with a certain contact
distance. In the transmission switch 10, when an external magnetic field is applied in the axial
direction of each lead, the first lead piece 11 and the second lead piece 12 are magnetized, and
the free ends facing each other absorb and contact each other , Contact portion 13 closes the
circuit. Also, when the magnetic field is not applied, the elasticity of each lead opens the contact
portion 13 to open the circuit. In addition, in the glass tube 14, in order to prevent activation of
the contact part 13, the inert gas 15 is enclosed.
[0022]
The transmission switch 10 has a magnet at a position where the magnetic field is applied to the
contact portion 13 when the operation unit is not operated, and at a position where the magnetic
field is not applied to the contact portion 13 when the operation unit is operated. It is configured
to have a magnet.
[0023]
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Next, the configuration of the hook switch 20 will be described.
FIG. 4 is an explanatory view showing an example of a reed switch used as the hook switch 20.
As shown in FIG. FIG. 4A shows a state in which the hook switch 20 is not affected by the
magnetic field. FIG. 4B shows a state in which the hook switch 20 is affected by the magnetic
field.
[0024]
The hook switch 20 has a structure in which one lead and two leads opposed to the lead with a
contact distance are enclosed in the glass tube 24. Two of the three leads are ferromagnetic and
one is a COM (common) lead 21 and the other is an NO lead (normally open contact) 23. The
other one of the three leads is a lead having a nonmagnetic portion at the free end and is an NC
lead (normally closed contact) 22. In addition, in the glass tube 24, in order to prevent activation
of the contact part 26, the inert gas 25 is enclosed.
[0025]
As shown in FIG. 4A, when the magnetic field is not applied to the hook switch 20, the
mechanical bias of the COM lead 21 causes the free end of the COM lead 21 to contact the free
end of the NC lead 22 and the contact portion 26 form. On the other hand, as shown in FIG. 4B,
when a magnetic field is applied from the outside in the axial direction of the lead of the hook
switch 20, the COM lead 21 and the NO lead 23 are magnetized and the opposite free ends
absorb each other. And the contact portion 26 make contact and the circuit is closed.
[0026]
Next, the operation of the handset microphone 100 will be described. FIG. 2A is a circuit diagram
showing a state of preparation for operation of the handset microphone 100. As shown in FIG.
FIG. 2B is a circuit diagram showing a state of the handset microphone 100 in operation. FIG. 2C
is a circuit diagram showing a state in which an external magnetic field is applied when the
handset microphone 100 is in operation.
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[0027]
The handset microphone 100 in FIG. 1 described above is in a state in which the handset
microphone 100 is fixed to a hook (not shown). Therefore, under the influence of the magnet
attached to the hook, the COM lead 21 of the hook switch 20 is in contact with the NO lead 23.
From this state, when the handset microphone 100 is removed from the hook, it becomes as
shown in FIG. 2 (a). That is, the COM lead 21 of the hook switch 20 changes to a state of
contacting the NC lead 22. As a result, the output end of the microphone unit 30 is connected to
the output terminal via the hook switch 20.
[0028]
Next, when the transmission switch 10 is operated to be in the transmission state, the state
shown in FIG. That is, since the operation part which is not shown in figure is pressed down and
the magnetic field added to the transmission switch 10 is kept away, the contact point of the 1st
lead piece 11 and the 2nd lead piece 12 is opened. As a result, the output signal from the
microphone unit 30 is output via the hook switch 20.
[0029]
When an unexpected external magnetic field is applied to the transmission switch 10 and the
hook switch 20 in the state shown in FIG. 2 (b), the state becomes as shown in FIG. 2 (c). As
shown in FIG. 2C, when an external magnetic field is applied to the transmission switch 10, the
first lead piece 11 and the second lead piece 12 contact to short the output end of the
microphone unit 30. As a result, the output from the microphone unit 30 is cut off. When an
external magnetic field is applied to the hook switch 20, the contact with the COM lead 21 is
switched from the NC lead 22 to the NO lead 23. By this, the output end of the microphone unit
30 is disconnected.
[0030]
Here, FIG. 2C shows a case where an external magnetic field is applied to both the transmission
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switch 10 and the hook switch 20. However, in the present invention, if an external magnetic
field is applied to only one of the transmission switch 10 and the hook switch 20, the output
from the microphone unit 30 is cut off.
[0031]
According to the handset microphone 100 described above, the hook switch 20 is provided in
addition to the transmission switch 10, and by adopting the reed switch for these, mixing of noise
at the time of switch operation is prevented while malfunction due to the external magnetic field
It can prevent.
[0032]
10 Send switch 20 Hook switch 30 Microphone unit 100 Handset microphone
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