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DESCRIPTION JPH077782

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DESCRIPTION JPH077782
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is connected
to a jack of a main device such as a portable CD stereo device via a plug, provides an earphone at
the end of the cable, and controls the main device in the middle of the cable The present
invention relates to a remote control equipped earphone apparatus including a remote control
unit, and more particularly, to a connection method of a core wire and a plug terminal in a cable.
[0002]
2. Description of the Related Art A conventional example of a remote control equipped earphone
apparatus when the main apparatus is, for example, a portable CD stereo apparatus will be
described. In the case of a portable CD stereo device, a remote control unit is provided in the
middle of the cable of the earphone to improve ease of use at the time of carrying, and a switch
for operating the CD stereo device and an operation state or operation state are displayed on the
remote control portion. In general, a liquid crystal display unit and a volume control volume are
provided. An example of such a system is shown in FIG.
[0003]
In FIG. 3, 1 is a portable CD stereo device (also described as a main device), 1a is a main device
jack, X is an earphone device with remote control, 2a is a cable, 2b is provided at one end of the
cable 2a, and is mounted on the main device jack 1a Pluggable plug, 2c: earphone provided at
the other end of cable 2a, 2d: remote control unit provided in the middle of cable 2a, 2e: volume
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control volume, 2f: operation key, 2g: liquid crystal display unit .
[0004]
In such a portable CD stereo device 1, an operation signal for operating the CD stereo device 1
between the CD stereo device 1 as the main device and the remote control unit 2d of the remote
control equipped earphone device X as the accessory device. A pulse-like control signal (digital
signal) for causing the liquid crystal display unit 2g to display the operation state of the CD
stereo device 1 and an audio signal (analog signal) for driving the earphone 2c are exchanged.
[0005]
In general, these two types of signals affect each other to some extent, and when a control signal
component mixes into an audio signal, it sounds as noise and causes deterioration in sound
quality, and when an audio signal component mixes into a control signal May cause problems in
control operation and display operation.
[0006]
A more specific description will be given with reference to FIGS.
In FIG. 4 showing a connection schematic diagram in the case of a 5-pole plug 5-core cable, 3 is a
main device, 3a is a 5-pole jack, 3a1 to 3a5 is a jack terminal, 3b is an audio amplifier, 3c is a
microcomputer for a main device, 4c Is a plug of 5 poles, 4a1 to 4a5 are plug terminals
corresponding to jack terminals 3a1 to 3a5, 5 is a cable of 5 cores, 5A is an audio signal line, 5C
is a control signal line, and 5G is a ground line in the main unit 3. Common return for audio
signal and control signal connected to 芯, core number, ~ 6 remote control unit, 6a volume
control volume, 6b remote control microcomputer, 6c operation key, 6d liquid crystal display
unit , 6GA is an audio signal return, 6GC is a control signal return, and 7 is an earphone.
The details of the connection between the core wires in the cable 5 and the plug terminals 4a1 to
4a5 are as shown in FIG.
4b is an insulator between terminals, 4c is a plug body.
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[0007]
FIG. 6 is a perspective view showing the jack 3 a and the plug 4. 3d is a main device cabinet, 3e
is a printed wiring board.
[0008]
In the remote control section 6, the audio signal return 6GA and the control signal return 6GC
are connected to the common return 5G, and in the plug 4, the common return 5G is connected
to the plug terminal 4a3. Therefore, the number of contact terminals in the plug 4 and the jack
3a is reduced by one, and the cost can be reduced by simplifying the structure. However, since
each core in the cable 5 is extremely thin, the impedance of the common return line 5G becomes
a non-negligible value, and the audio signal (analog signal) and the control signal (digital signal)
mutually affect each other, as described above. As described above, the control signal component
may be mixed into the audio signal to be heard as noise, or the audio signal component may be
mixed into the control signal to cause an operation failure.
[0009]
In order to solve the above problems, a remote control equipped earphone apparatus X as shown
in FIGS. 7 to 9 has been considered. In FIG. 7 showing a connection schematic diagram in the
case of a 6-pole plug and a 6-core cable, 8 is a main device, 8a is a 6-pole jack, 8a1 to 8a6 are
jack terminals, 8b is an audio amplifier, 8c is a microcomputer for a main device, 9c 6a plug, 9a1
to 9a6 plug terminals corresponding to jack terminals 8a1 to 8a6, 10 a 6-core cable, 10A an
audio signal line, 10C a control signal line, 10GA and 10GC each plug terminals 9a3, Audio signal
return and control signal return connected to 9a6 separately and connected to the ground line in
the main unit 8, ~ indicates a core number, 11 indicates a remote control unit, 11a indicates a
volume control volume, and 11b indicates a remote control microcomputer , 11c: operation keys,
11d: liquid crystal display unit, 11GA: audio signal return, 11GC: control signal return, 12: ear It
is over emissions. The details of the connection between the respective core wires in the cable 10
and the plug terminals 9a1 to 9a6 are as shown in FIG. 9b is an insulator between terminals, 9c
is a plug body. FIG. 9 is a perspective view showing the jack 8 a and the plug 9. 8d is a main
device cabinet, and 8e is a printed wiring board.
[0010]
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In the remote control unit 11, the audio signal return 11GA and the control signal return 11GC
are separated. The audio signal return line 11GA is connected to the audio signal return line
10GA in the cable 10, and the control signal return line 11GC in the remote control unit 11 is
connected to the control signal return line 10GC in the cable 10. It is grounded separately inside.
Therefore, even if the audio signal return line 10GA and the control signal return line 10GC in
the cable 10 are extremely small in impedance, the control signals are separated because both
return lines 10GA and 10GC are separated from each other in the cable 10. The mixing from the
(digital signal) to the audio signal (analog signal) and the mixing from the audio signal to the
control signal are also only slight due to the capacitance between the core wires, and the level is
practically acceptable. However, in this case, the number of core wires is increased by one, and
the number of contact terminals is increased by one in each of the plug 9 and the jack 8a,
resulting in a complicated structure and an increase in cost.
[0011]
In the prior art, although the former has a small number of contact terminals, the audio signal
and the control signal interfere with each other, and in particular, when the control signal
component is mixed in the audio signal, it becomes noise. There is a problem that the sound
quality is deteriorated, and although the latter does not cause interference between the two
signals, there is a problem that the number of contact terminals increases and the structure
becomes complicated and the cost increases.
[0012]
The present invention has been made in view of such circumstances, and the number of contact
terminals of the plug and the jack is reduced to simplify the structure and reduce the cost, and
the mutual interference between the control signal and the audio signal is realized. The purpose
is to ensure high reliability without it.
[0013]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has
the following configuration.
The most significant feature is that the audio signal return and the control signal return are
separately wired in the cable, and the both returns are commonly connected at the plug
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terminals.
That is, as a premise, the jack of the main device is detachably connected via the plug, the
earphone is provided at the end of the cable, and the remote control unit for controlling the main
device is provided in the middle of the cable. In such a remote control equipped earphone device,
the audio signal return and control signal return separately derived from the remote control
section are led as separate core wires even in the cable, and further compatible with the common
jack terminal connected to the ground line The end portions of the two core wires are commonly
connected to a common plug terminal.
[0014]
[Operation] Since the audio signal return and the control signal return are wired as separate
cores in the cable, mutual interference between the control signal and the audio signal is possible
even if these cores are thin and not negligible in impedance. It does not occur substantially. Then,
since the audio signal return line and the control signal return line are connected to the common
plug terminal in the plug, the number of contact terminals for the plug and the jack is smaller
than the number of core wires, and the structure can be simplified.
[0015]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the
remote control equipped earphone apparatus according to the present invention will be
described in detail with reference to the drawings.
[0016]
In FIG. 1 showing a connection schematic diagram in the case of a 5-pole plug 6-core cable, 3 is a
main unit (portable CD stereo device), 3a is a 5-pole jack, 3a1 to 3a5 is a jack terminal, 3b is an
audio amplifier, 3c Is a microcomputer for the main unit, 4 is a plug of 5 poles, 4a1 to 4a5 are
plug terminals corresponding to the jack terminals 3a1 to 3a5, 5 is a cable of 6 cores, 5A is an
audio signal line, 5C is a control signal line, 5GA Reference numeral 5GC denotes an audio signal
return and a control signal return which are separated and wired in the cable 5. The audio signal
return 5GA and the control signal return 5GC are common to the common plug terminal 4a3 in
the plug 4. It is grounded.
[0017]
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The symbol ~ indicates a core number, 6 is a remote control unit, 6a is a volume control volume,
6b is a remote control microcomputer, 6c is an operation key, 6d is a liquid crystal display unit,
6GA is an audio signal return, 6GC is a control signal return, 7 is It is an earphone.
The audio signal return 6GA and the control signal return 6GC are separated from each other in
the remote control unit 6, the audio signal return 6GA is connected to the audio signal return
5GA of the cable 5, and the control signal return 6GC is connected to the cable 5. Connected to
control signal return 5GC.
[0018]
The details of the connection between the core wires in the cable 5 and the plug terminals 4a1 to
4a5 are as shown in FIG.
4b is an insulator between terminals, 4c is a plug body. The jack 3a and the plug 4 are simplified
in structure as in FIG. Since the audio signal return line 5GA and the control signal return line
5GC are commonly connected to the common plug terminal 4a3 in the plug 4, the number of
contact terminals in the plug 4 and the jack 3a is reduced by one, The cost can be reduced by
simplifying the structure. Further, since the audio signal return line 5GA and the control signal
return line 5GC are separated from each other in the cable 5, mutual interference between the
audio signal (analog signal) and the control signal (digital signal) disappears, and the earphone 7
While the sound quality is improved, the control signal from the operation key 6c and the drive
signal to the liquid crystal display unit 6d are not disturbed and the operation reliability is
improved.
[0019]
The liquid crystal display unit 6 d in the remote control unit 6 may be omitted.
[0020]
As described above, according to the present invention, since the audio signal return line and the
control signal return line are wired as separate cores in the cable, interference between the
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control signal and the audio signal can be prevented. Both the control signal and the audio signal
can be transmitted in a high quality state in which noise is not mixed.
Moreover, since the audio signal return line and the control signal return line are connected to
the common plug terminal in the plug instead of in the remote control unit, the number of
contact terminals in the plug is reduced by one from the number of core wires, simplifying the
structure and reducing the cost. Can be achieved.
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