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JP2006054588

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2006054588
PROBLEM TO BE SOLVED: To make it possible to always listen well when listening to an FM
radio broadcast signal with a speaker. SOLUTION: In a radio receiver having an earphone jack 4,
a speaker 3, and an earphone / speaker changeover switch 2 and utilizing the cord 10b of the
earphone 10 as an antenna, this earphone / speaker changeover switch 2 is used. The
notification means 21 is provided to notify when the plug 10a of the earphone 10 is not
connected to the earphone jack 4 when switching to the speaker side. [Selected figure] Figure 1
Radio receiver
[0001]
The present invention relates to a radio receiver capable of switching between and listening to an
earphone and a speaker and utilizing the cord of the earphone as an antenna.
[0002]
Conventionally, a rod antenna or the like has been used as an antenna of a radio receiver that
receives FM radio broadcast signals (including audio signals of television broadcasts), but in
recent portable radio receivers, importance is placed on portability. The cord of the earphone is
used as an antenna (see Patent Document 1).
[0003]
Also, a radio receiver has been proposed in which a cord of an earphone as shown in FIG. 7 is
conventionally used as an antenna for receiving an FM radio broadcast, and an FM radio
broadcast signal can be listened to by the earphone and can also be listened by a speaker. ing.
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1
[0004]
Referring to FIG. 7, reference numeral 1 in FIG. 7 denotes a radio receiver main body, and an
audio signal from an output terminal 1a of the radio receiver main body 1 is switched through an
earphone / speaker switch via a capacitor 8 for DC blocking. It supplies to the central fixed
contact 2a of the slide switch which comprises 2.
The movable contact 2b of the slide switch connects the central fixed contact 2a to the speaker
side fixed contact 2S when the speaker 3 described later is used, and when the earphone is used,
the central fixed contact 2a and the earphone side fixed contact 2E And connect.
[0005]
The speaker side fixed contact 2S is grounded via the speaker 3 and connected to one contact 4a
of the earphone jack 4, and the earphone side fixed contact 2E is high frequency blocking for
isolating the portion of the earphone jack 4 at high frequency. It connects to the other contact
point 4b of this earphone jack 4 via the coil 5 for this.
[0006]
The ground contact 4c of the earphone jack 4 is grounded via a high frequency blocking coil 6
for isolating the portion of the earphone jack 4.
Further, the ground contact 4c of the earphone jack 4 is connected to the antenna terminal 1b of
the radio receiver main body 1 via the capacitor 7.
[0007]
In FIG. 7, when the earphone plug is connected to the earphone jack 4 and the central fixed
contact 2a and the earphone side fixed contact 2E are connected by the movable contact 2b of
the earphone / speaker changeover switch 2, the earphone cord is used as an antenna. The
received FM radio broadcast signal is supplied to the antenna terminal 1b of the radio receiver
main body 1 via the grounding contact 4c of the earphone jack 4 and the capacitor 7 and the
audio signal from the output terminal 1a of the radio receiver main body 1 It is possible to listen
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2
to the FM radio broadcast signal by the supplied earphone.
[0008]
Further, when the earphone plug is connected to the earphone jack 4 and the central fixed
contact 2a and the speaker side fixed contact 2S are connected by the movable contact 2b of the
earphone / speaker changeover switch 2, the FM radio receives the cord of the earphone as an
antenna A broadcast signal is supplied to the antenna terminal 1b of the radio receiver main
body 1 via the grounding contact 4c of the earphone jack 4 and the capacitor 7, and an audio
signal from the output terminal 1a of the radio receiver main body 1 is supplied to the speaker 3.
The speaker 3 can listen to an FM radio broadcast signal.
[0009]
Also, in FIG. 7, a radio receiver having a take-up earphone in which the cord of the earphone is
kept connected without providing the earphone jack and the cord of the earphone is wound up in
the housing of the radio receiver is proposed. However, in this case, by pulling out the cord of the
earphone and switching by the earphone / speaker changeover switch 2, the FM radio broadcast
signal can be heard through the earphone or the speaker.
Japanese Utility Model Publication No. 57-14505
[0010]
However, in the conventional example of FIG. 7, when listening with the earphones, there is no
problem since the earphone plug is connected to the earphone jack 4, but listening to the FM
radio broadcast signal (including the audio signal of television broadcast) with the speaker 3 If
you do not know or forget that you are using the earphone cord as an antenna, and you do not
connect the earphone plug to this earphone jack 4, you can not listen to FM radio broadcast
signals well, and the radio receiver is broken It was inconvenient to misunderstand.
[0011]
Also, in a radio receiver having a take-up earphone, the earphone cord is pulled out and used
when listening to the earphone, so there is no problem at all, but when trying to listen to an FM
radio broadcast signal with a speaker, the earphone cord When you keep winding up the
earphone cord without pulling out the earphone without pulling out the earphone without
knowing that you are using it as an antenna, you can not listen to the FM radio broadcast signal
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well, with a breakdown of this radio receiver There was a disadvantage to misunderstand.
[0012]
An object of the present invention is to make it possible to always listen well when listening to an
FM radio broadcast signal with a speaker.
[0013]
The radio receiver according to the present invention has an earphone jack, a speaker, and an
earphone / speaker switch, and in the radio receiver in which the cord of the earphone is used as
an antenna, this earphone / speaker switch is on the speaker side. A notification means is
provided to notify when the earphone plug is not connected to the earphone jack when
switching.
[0014]
The radio receiver according to the present invention has a winding earphone, a speaker, and an
earphone / speaker switch, and the earphone switch is used in a radio receiver in which the cord
of the earphone is used as an antenna. A notification means is provided to notify when the takeup earphone is not pulled out when switching to the speaker side.
[0015]
According to the present invention, when the earphone / speaker switch is switched to the
speaker side, the notification means is provided to notify when the earphone plug is not
connected to the earphone jack or when the take-up earphone is not pulled out. Therefore, since
the connection of the cord of the earphone as the antenna or the withdrawal of the cord of the
earphone is performed without forgeting, the FM radio broadcast signal can be listened to good
by the speaker at all times.
[0016]
Hereinafter, an example of the best mode for carrying out the present invention radio receiver
will be described with reference to FIG. 1 and FIG.
In FIG. 1, parts corresponding to FIG. 7 are given the same reference numerals.
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[0017]
In FIG. 1, reference numeral 1 denotes a radio receiver main body capable of receiving an FM
radio broadcast signal (including an audio signal of television broadcast) and the like, and an
audio signal from an output terminal 1a of the radio receiver main body 1 The central fixed
contact 2 a of the slide switch constituting the earphone / speaker changeover switch 2 is
supplied.
[0018]
When the speaker 3 is used, the movable contact 2b of the slide switch connects the central fixed
contact 2a to the speaker-side fixed contact 2S. When the earphone 10 is used, the central fixed
contact 2a and the earphone-side fixed contact 2E are used. And connect.
[0019]
The speaker side fixed contact 2S is grounded via a series circuit of the speaker 3 and the DC
blocking capacitor 11, and the speaker side fixed contact 2S is connected to one contact 4a of the
earphone jack 4, and the earphone side fixed contact 2E Is connected to the other contact 4b of
the earphone jack 4 via a high frequency blocking coil 5 for isolating the portion of the earphone
jack 4 in a high frequency manner.
[0020]
Further, the speaker side fixed contact 2S is connected to the earphone side fixed contact 2E
through the resistor 12, and a direct current voltage is always superimposed on the earphone
jack 4.
[0021]
The ground contact 4c of the earphone jack 4 is grounded through a series circuit of a high
frequency blocking coil 6 and a DC blocking capacitor 13 for isolating the portion of the
earphone jack 4.
Further, the ground contact 4c of the earphone jack is connected to the antenna terminal 1b of
the radio receiver main body 1 via the capacitor 7.
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[0022]
In this example, the connection point of the coil 6 and the capacitor 13 is connected through the
resistor 14 to the base of the npn transistor 15 that constitutes the detection circuit, and the base
of the transistor 15 is a parallel circuit of the capacitor 16 and the resistor 17 The emitter of the
transistor 15 is grounded, and the collector of the transistor 15 is connected through a resistor
18 to a power supply terminal 19 to which a positive DC voltage is supplied.
[0023]
A signal obtained at the collector of the transistor 15 is supplied to a microcomputer 20 which
constitutes a determination and display circuit, and the microcomputer 20 lights up, for example,
a light emitting diode (LED) 21.
[0024]
In this case, as shown in FIG. 2, when the plug 10a of the earphone 10 is inserted and connected
to the earphone jack 4, the DC voltage superimposed on the earphone jack 4 is a transistor via
the ground contact 4c, the coil 6, and the resistor 14. The signal is supplied to the base 15 to
turn on the transistor 15 and to set the collector of the transistor 15 to the ground level, that is,
the low level "0" so as not to light the light emitting diode 21 at this time.
[0025]
Also, when the movable contact 2b of the earphone / speaker changeover switch 2 connects the
speaker side fixed contact 2S and the central fixed contact 2a, and the plug 10a of the earphone
10 is not inserted into the earphone jack 4, Since the DC voltage is not supplied to the base of the
transistor 15, the transistor 15 is turned off, the collector of the transistor 15 becomes the
voltage of the power supply terminal 19, that is, high level "1", and the light emitting diode 21 is
lit.
[0026]
In this case, the light emitting diode 21 is disposed in the vicinity of the earphone jack 4 as
shown in FIG.
At this time, it is informed that the plug 10a of the earphone 10 is not inserted into and
connected to the earphone jack 4 by lighting of the light emitting diode 21, and urges the user to
insert and connect to the plug 10a earphone jack of the earphone 10. It becomes.
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[0027]
In the example shown in FIGS. 1 and 2, the earphone plug 10a of the earphone 10 is connected
to the earphone jack 4, and the central fixed contact 2a and the earphone side fixed contact 2E
are connected by the movable contact 2b of the earphone / speaker changeover switch 2. At the
same time, the FM radio broadcast signal received with the cord 10 b of the earphone 10 as an
antenna is supplied to the antenna terminal 1 b of the radio receiver main body 1 via the earth
contact 4 c of the earphone jack 4 and the capacitor 7. An audio signal from the output terminal
1a is supplied to the earphone 10, and the earphone 10 can listen to an FM radio broadcast
signal.
[0028]
At this time, a DC voltage is supplied from the earphone jack 4 to the base of the transistor 15,
the transistor 15 is turned on, the collector of the transistor 15 is set to low level "0", and the
light emitting diode 21 is not lighted.
[0029]
Further, when the earphone plug 10a is connected to the earphone jack 4 and the central fixed
contact 2a and the speaker side fixed contact 2S are connected by the movable contact 2b of the
earphone / speaker switch 2, the FM 10b of the earphone 10 is received as an antenna The radio
broadcast signal is supplied to the antenna terminal 1b of the radio receiver main body 1 via the
grounding contact 4c of the earphone jack 4 and the capacitor 7, and the audio signal from the
output terminal 1a of the radio receiver 1 is supplied to the speaker 3. The speaker 3 can listen
to an FM radio broadcast signal.
[0030]
At this time, the DC voltage from the earphone jack 4 is supplied to the base of the transistor 15,
the transistor 15 is turned on, the collector of the transistor 15 is set to low level "0", and the
light emitting diode 21 is not lighted.
[0031]
Also, in this example, the speaker / fixed switch 2S and the central fixed contact 2a are
connected by the speaker side, ie, the movable contact 2b, of the earphone / speaker switch 2,
but when the earphone plug 10a of the earphone 10 is not connected to the earphone jack 4
Since there is no cord 10b of the earphone 10 as an antenna, the FM radio broadcast signal can
not be listened well, but at this time the transistor 15 is turned off since the DC voltage from the
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earphone jack 4 is not supplied to the base of the transistor 15. The collector of the transistor 15
becomes high level "1", and the light emitting diode 21 lights up to notify the listener that the
cord 10b of the earphone 10 as an antenna is not connected.
[0032]
By notifying that the earphone plug 10a of the earphone 10 is not connected to the earphone
jack 4, by connecting the earphone plug 10a of the earphone 10 to the earphone jack 4, the FM
radio broadcast signal can be favorably listened to, and thus According to this embodiment, even
when listening to the FM radio broadcast signal by the speaker 3, the user can always listen well.
[0033]
3 to 6 show other examples of the best mode for carrying out the present invention.
In this example, as shown in FIGS. 4A and 4B, the earphone cord 10b has a take-up earphone
10d adapted to be taken up in a housing 29 of a radio receiver, and the cord 10b of the earphone
10d is used as an antenna. It is
3 to 6, the parts corresponding to those in FIGS. 1 and 2 are denoted by the same reference
numerals.
[0034]
In FIG. 3, reference numeral 1 denotes a radio receiver main body capable of receiving an FM
radio broadcast signal (including an audio signal of television broadcast) and the like, and an
audio signal from an output terminal 1a of the radio receiver main body 1 The earphone /
speaker switch 2 is supplied.
[0035]
An audio signal obtained at the speaker side output terminal 2c of the earphone / speaker
changeover switch 2 is supplied to the speaker 3 and an audio signal obtained at the earphone
side output terminal 2d of the earphone / speaker changeover switch 2 is wound via the cord
10b. It supplies to taking earphone 10d.
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Further, the received FM radio broadcast signal is supplied to the antenna terminal 1b of the
radio receiver main body 1 by the cord 10b of the winding earphone 10d.
[0036]
In this embodiment, a detection switch 30 is provided to detect whether the take-up earphone
10d is taken up or pulled out.
As the detection switch 30, for example, as shown in FIG. 4B, the microswitch 30 is provided in
the storage section when the winding earphone 10d is wound up, and is turned off when the
winding earphone 10d is in the storage section. When not in the storage unit, turn on.
[0037]
In FIG. 3, reference numeral 31 denotes a microcomputer, which controls the on / off and music
selection of the radio receiver main body 1 according to the instruction of the switch circuit 32,
and controls the display of the liquid crystal display device 33. It is made to make various
judgments.
[0038]
In the present embodiment, switching information of the earphone / speaker changeover switch
2 is supplied to the microcomputer 31, and information from the winding and pulling out
detection switch 30 is supplied to the microcomputer 31.
[0039]
In this example, the operation is as shown in the flowchart of FIG.
That is, when the power switch of the radio receiver is turned on (step S1), it is determined
whether the reception band is an FM radio broadcast band (step S2).
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At this time, when the band is not the FM radio broadcast band, for example, the AM radio
broadcast band, the band of the AM radio broadcast is received and listened to (step S3).
[0040]
In this step S2, in the case of the FM radio broadcast band, it is next determined whether the
speaker 3 is listening by the information from the earphone / speaker changeover switch 2 (step
S4).
Since the cord 10b is pulled out when listening with the take-up earphone 10d instead of the
speaker 3, the cord 10b can be used as an antenna, and the radio broadcast signal is listened as it
is (step S3).
[0041]
In this step S4, when the speaker 3 is listening, it is then judged from the information from the
winding and pulling out detection switch 30 whether or not the earphone 10d is wound (step
S5).
Since the cord 10b of the earphone 10d is pulled out when it is not taken up, the cord 10b can
be used as an antenna, and the radio broadcast is listened as it is (step S3).
[0042]
In this step S5, when the earphone 10d is wound up, the cord 10b of the earphone 10d does not
function as an antenna, and the FM radio broadcast signal can not be received satisfactorily. At
this time, the earphone 10d is wound around the liquid crystal display 33 Informing that it has
been taken is performed (step S6).
[0043]
As an example of the display of the liquid crystal display device 33 of this notification, it is
displayed as shown in FIG.
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"Is displayed blinking.
[0044]
By notifying that the take-up earphone 10d is taken up, by pulling out the take-up earphone 10d,
it is possible to listen to an FM radio broadcast signal well. Therefore, according to the present
embodiment, the FM radio broadcast by the speaker 3 When listening to the signal, you can
always listen well.
[0045]
Although in the above example, the light emitting diode 21 and the liquid crystal display device
33 are used as the notifying means for notifying, it is needless to say that other notifying means
such as voice may be used.
[0046]
Further, it goes without saying that the present invention is not limited to the above-described
example and that various other configurations can be adopted without departing from the scope
of the present invention.
[0047]
It is a block diagram which shows the example of the best form for implementing this invention
radio receiver.
It is an external appearance perspective view of FIG.
It is a block diagram which shows the other example of the best form for implementing this
invention radio receiver.
A is an external appearance perspective view of FIG. 3, B is a perspective view which shows the
example of the principal part of FIG.
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5 is a flowchart provided for explaining FIG. 3;
It is a diagram which shows the example of a display.
It is a block diagram which shows the example of the conventional radio receiver.
Explanation of sign
[0048]
DESCRIPTION OF SYMBOLS 1 ... Radio receiver main body, 2 ... earphone / speaker selector
switch, 3 ... speaker, 4 ... earphone jack, 7, 13, 16 ... capacitor | condenser, 15 ... transistor, 10,
10d ... earphone, 10a ... earphone plug, 10b ... cord 20, 31 ... microcomputer, 21 ... light emitting
diode, 30 ... detection switch, 33 ... liquid crystal display device
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