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DESCRIPTION JPH1118189

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DESCRIPTION JPH1118189
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
cooling device in an audio reproducing apparatus.
[0002]
2. Description of the Related Art In an audio reproducing apparatus, the larger the output of an
amplifier for reproducing music or the like, the better the reproduction ability and the advantage
of being able to drive the speaker with a margin, but the heat generation of the amplifier
becomes large. Therefore, the heat sink etc. of the amplifier becomes large, and there is a
problem that the audio reproducing apparatus becomes large.
[0003]
In order to solve this, recently, there is one equipped with a fan that cools the heat sink of the
amplifier.
In this device, the heat sink can be miniaturized even if the output of the amplifier is large, and
the audio reproducing device can be miniaturized. However, the noise of the fan becomes a
problem, which is a serious problem particularly when playing delicate music.
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[0004]
In order to solve this problem, the temperature (heat) of the heat sink is detected, the method of
stopping the fan when the temperature is low, the level of the output signal of the amplifier is
detected, and the signal level is below the set level. When, for example, a method to stop the fan
has been proposed.
[0005]
However, in the former method, there is a problem that the fan noise is anxious because the
temperature detection time delay is very large and the fan is driven for a considerable time even
if the volume becomes small after the large volume reproduction. The
On the other hand, in the latter method, when only the headphones are used instead of the
speakers, the level of the output signal of the amplifier is increased, and the speaker of the
headphones is obtained even when the level is higher than the set level of the signal level
detection circuit. Because the resistance is connected in series to (load) and the impedance is
large, the output current of the amplifier is small and there is almost no heat generation from the
amplifier, but in the above case, the fan is driven to break the silence And there was a problem.
[0006]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a cooling
device in an audio reproduction device which can solve the above problems.
[0007]
[Means for Solving the Problems] In order to achieve the above object, the feature of the present
invention is that a speaker is connected to an amplifier via a speaker drive switch, and a
connection point between the amplifier and the speaker drive switch is provided. An output
terminal of the headphone is connected, an input terminal of the headphone is freely connected
to the output terminal, a fan for cooling the heat sink of the amplifier, and a fan drive circuit
provided with the fan drive circuit; There is a fan drive switch that is turned on in conjunction
with the turning on of the drive switch and turned off in conjunction with the turned off of the
switch.
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The speaker drive switch and the fan drive switch may be mechanically interlocked. Further, a
speaker is connected to the amplifier via a speaker drive switch, an output terminal for
headphones is connected to a connection point between the amplifier and the speaker drive
switch, and an input terminal of the headphone is made freely connectable to the output
terminal. In a fan drive circuit provided with a fan for cooling the heat sink of the amplifier, the
fan drive circuit is provided with a fan drive switch, and interlocked with the connection
operation of the headphone input terminal to the headphone output terminal, There may be
provided interlocking means for turning on both of the switches in conjunction with the
operation of turning off the speaker driving switch and the fan driving switch and interlocking
with the closing operation of the input terminal to the output terminal. Further, the interlocking
means may include: an interlocking means for a speaker drive switch operating the speaker drive
switch; and an interlocking means for a fan drive switch operating the fan drive switch. In
addition, the fan drive circuit may be provided with a signal level detection circuit that allows
power supply to the fan only when the level of the output signal of the amplifier becomes equal
to or higher than the set level.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION A first example of the embodiment of the
present invention will be described below with reference to the drawing of FIG. 1. The left and
right power amplifiers (low frequency amplifiers) 2L, 2L, are provided at the left and right input
terminals 1L, 1R. Speaker drive switches 3L and 3R and (loud) speakers 4L and 4R, which are 2R
and open / close switches, are connected in the above order. Each amplifier 2L, 2R is composed
of a power transistor or the like, and the headphone output terminal 5L, 5R is connected to the
connection point between each amplifier 2L, 2R and each speaker drive switch 3L, 3R via a
resistor 22L, 22R, respectively. Are connected, and the output jacks 5L and 5R, the grounding
terminal 6 and the like constitute a headphone jack (connecting portion) 7.
[0009]
A headphone 9 has a pair of left and right speakers 10L and 10R, input terminals 11L and 11R,
an earth terminal 12 and the like, and a plug (connection portion) 13 is configured by the
terminals 11L, 11R and 12 and the like. The plug 13 can be connected to and separated from the
headphone jack 7 so that the input terminals 11L and 11R of the headphone 9 and the ground
terminal 12 can be connected to and disconnected from the headphone output terminals 5L and
5R and the ground terminal 6, respectively. It is done.
[0010]
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A fan 16 is connected to a connection point between the amplifiers 2L and 2R and the speaker
drive switches 3L and 3R via a fan drive circuit 15. The fan 16 cools the heat sink 8 of the
amplifiers 2L and 2R.
The fan drive circuit 15 has a signal level detection circuit 17, a fan drive switch 18, a power
supply and the like.
[0011]
The signal level detection circuit 17 allows power supply to the fan 16 only when the levels of
the output signals of the amplifiers 2L and 2R become equal to or higher than the set level, and
is configured as follows. That is, one end of each of the resistors 19L and 19R is connected to the
connection point between each of the amplifiers 2L and 2R and each of the speaker drive
switches 3L and 3R, and the other end of each of the resistors 19L and 19R is connected to each
other. It is connected to the base of the (switching) transistor T1 via the diode D1. The
connection point between the resistors 19L and 19R and the diode D1 is grounded via the
resistor 20, and the connection point between the diode D1 and the transistor T1 is grounded via
the diode D2 and the electrolytic capacitor C connected in parallel. . The emitter of the transistor
T1 is grounded, and a positive voltage (power supply) + B is applied to its collector via the
resistor 21. The base of the transistor T2 is connected to the connection point between the
collector of the transistor T1 and the resistor 21, the positive voltage + B is applied to the
emitter, and the fan drive switch 18 is connected to the collector .
[0012]
The fan drive switch 18 is an open / close switch, and mechanically interlocked with the speaker
drive switches 3L and 3R. When the speaker drive switches 3L and 3R are turned on, the fan
drive switch 18 is turned on and the speaker drive switches 3L and 3R At the time of the off
operation of the fan drive switch 18 is operated off. As described above, the fan drive switch 18
can be automatically turned on and off simply by turning the speaker drive switches 3L and 3R
on and off, and the operation is simple.
[0013]
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According to the first example, at the time of audio reproduction by use of the speakers 4L and
4R, the speaker drive switches 3L and 3R are turned on, and in conjunction with this, the fan
drive switch 18 is turned on. Also, the plug 13 of the headphone 9 is separated from the
headphone jack 7, and the input terminals 11L and 11R of the headphone 9 and the ground
terminal 12 are disconnected (separated) from the headphone output terminals 5L and 5R and
the ground terminal 6. It is assumed.
[0014]
In the above state, when an audio signal is input to each input terminal 1L, 1R, the audio signal is
amplified by the amplifiers 2L, 2R and supplied to the speakers 4L, 4R through the speaker drive
switches 3L, 3R. , And the speakers 4L and 4R are driven to perform audio reproduction.
[0015]
The level of the output signal of each of the amplifiers 2L and 2R is detected by the signal level
detection circuit 17 as follows.
That is, after the output signals of the respective amplifiers 2L and 2R are attenuated to the set
level by the resistors 19L and 19R, they are rectified to DC by the diodes D1 and D2 and the
capacitor C, and are input to the base of the transistor T1. Ru. When the level of the output signal
of each of the amplifiers 2L and 2R is less than the set level, the voltage applied to the base of
the transistor T1 is less than the set voltage (for example, 0.6 V or less), and the transistor T1 is
turned off Thus, the transistor T2 of the next stage is also turned off, and the power supply to the
fan 16 is blocked.
[0016]
Also, when the level of the output signal of each amplifier 2L, 2R becomes equal to or higher
than the set level, the voltage applied to the base of the transistor T1 becomes equal to or higher
than the set voltage, the transistor T1 is turned on, and the transistor T2 of the next stage is also
It turns on and power supply to the fan 16 is allowed. Then, since the fan drive switch 18 is in
the on state, power is supplied to the fan 16, the fan 16 is rotationally driven, and the heat sink 8
of the amplifiers 2L and 2R is cooled. Thus, since the heat sink 8 can be cooled by the fan 16, the
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heat sink 8 can be miniaturized even if the outputs of the amplifiers 2L and 2R are large, and the
audio reproducing apparatus can be miniaturized.
[0017]
On the other hand, at the time of audio reproduction by use of the headphone 9, the plug 13 of
the headphone 9 is connected to the headphone jack 7, and the terminals 11L, 11R, 12 of the
headphone 9 are connected to the headphone output terminals 5L, 5R and the ground terminal
6. Be done. Also, the speaker drive switches 3L and 3R are turned off, and in conjunction with
this, the fan drive switch 18 is turned off.
[0018]
In the above state, when an acoustic signal is input to each of the input terminals 1L and 1R, the
acoustic signal is amplified by the amplifiers 2L and 2R, and each speaker 10L of the headphone
9 is connected via the headphone jack 7 and the headphone plug 13. , 10R to drive the
respective speakers 10L and 10R and perform audio reproduction.
[0019]
By the way, when the headphones 9 are used, the output signals are reproduced through the
large series resistors 22L and 22R even when the levels of the output signals of the amplifiers 2L
and 2R are the same as in the audio reproduction by the use of the speakers 4L and 4R.
Therefore, although the output current of the amplifiers 2L and 2R is smaller than that at the
time of the above-mentioned reproduction, and the amplifiers 2L and 2R hardly generate heat,
sometimes the level of the output signal becomes equal to or higher than the set level of the
signal level detection circuit 17. In this case, the transistors T1 and T2 of the signal level
detection circuit 17 are turned on, and power supply to the fan 16 is permitted.
However, as described above, since the fan drive switch 18 is in the off state, the fan 16 is not
driven and the silence is not broken.
[0020]
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FIG. 2 shows a second example of the embodiment of the present invention, in which the speaker
is interlocked with the intermittent operation of the input terminals 11L and 11R of the
headphone 9 and the ground terminal 12 with respect to the headphone output terminals 5L and
5R and the ground terminal 6. Interlocking means 25 for turning on and off the drive switches
3L and 3R and the fan drive switch 18 is provided. As described above, in the second example,
the speaker drive switches 3L and 3R and the fan drive switch 18 can be automatically turned on
and off by the intermittent operation of the input terminals 11L and 11R of the headphone 9 and
the operation is simple. . Further, in the second example, the interlocking unit 25 is configured by
an interlocking unit 26 for a speaker drive switch and an interlocking unit 27 for a fan drive
switch.
[0021]
The speaker drive switch interlocking means 26 operates the speaker drive switches 3L and 3R
off in conjunction with the connection operation of the input terminals 11L and 11R of the
headphones 9 to the headphone output terminals 5L and 5R etc. The speaker drive switches 3L
and 3R are turned on by disconnecting (disconnecting and disconnecting) the input terminals
11L and 11R to the terminals 5L and 5R etc. Specifically, the speaker drive switches 3L and 3R
The relay contact of the output relay 29 is used, and a positive voltage + B is applied to one end
of the relay coil 30 of the output relay 29. Further, the headphone jack 7 is provided with an
interlocking switch 31. The switch 31 has a contact 32 and an interlocking portion 33, and the
other end of the relay coil 30 is through the contact 32. Is grounded. The interlocking portion 33
opens and closes the contact 32 in conjunction with the insertion and removal of the plug 13 of
the headphone 9 with respect to the headphone jack 7, and turns off the contact 32 when the
plug 13 is inserted into the jack 7. When the plug 13 is separated from the jack 7, the contact 32
is turned on.
[0022]
The fan drive switch interlocking means 27 turns off the fan drive switch 18 in conjunction with
the connection operation of the input terminals 11L and 11R of the headphones 9 to the
headphone output terminals 5L and 5R etc., and the output terminal 5L. , 5R, etc. by turning off
the input terminals 11L, 11R, etc., the fan drive switch 18 is turned on. Specifically, the fan drive
switch 18 is provided in the headphone jack 7, and the contact 34 is An interlocking portion 35
is provided, and a contact 34 is provided in the fan drive circuit 15. The interlocking part 35
opens and closes the contact 34 in conjunction with the insertion and removal of the plug 13 of
the headphone 9 with respect to the headphone jack 7 as described above, and the contact 34 is
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turned off when the plug 13 is inserted into the jack 7 In operation, when the plug 13 is
separated from the jack 7, the contact 34 is turned on.
[0023]
According to the second example, at the time of audio reproduction using the speakers 4L and
4R, the plug 13 of the headphone 9 is separated from the headphone jack 7, and the contact 32
of the interlock switch 31 is turned on. As a result, the speaker drive switches 3L and 3R are
turned on, and the contact 34 of the fan drive switch 18 is also turned on.
[0024]
In this state, when an audio signal is input to the input terminals 1L and 1R, the speakers 4L and
4R are driven to perform audio reproduction, and the level of the output signal of the amplifiers
2L and 2R is the signal level detection circuit 17 When the temperature exceeds the set level, the
fan 16 is rotationally driven and the heat sink 8 is cooled, as in the first example.
[0025]
Also, at the time of audio reproduction by use of the headphones 9, the plug 13 of the
headphones 9 is connected to the headphone jack 7.
As a result, the interlocking portion 33 of the interlocking switch 31 operates, the contact 32 is
turned off, power supply to the relay coil 30 is stopped, the speaker drive switches 3L and 3R are
turned off, and the fan drive switch 18 The interlocking portion 35 also operates to turn the
contact 34 off.
[0026]
In this state, when an audio signal is input to the input terminals 1L and 1R, the speakers 10L
and 10R of the headphones 9 are driven to perform audio reproduction.
Also, when the level of the output signal of the amplifiers 2L and 2R becomes equal to or higher
than the setting level of the signal level detection circuit 17, power supply to the fan 16 is
permitted, but since the contact 34 of the fan drive switch 18 is in the off state, The fan 16 is not
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rotationally driven, and the silence is not broken.
[0027]
As described above in detail, according to the present invention, when the headphones are used,
the fan is not driven and the silence is not broken, and only by turning the speaker drive switch
on and off, The fan drive switch can be turned on and off automatically, and the operation is
simple.
[0028]
According to the second aspect of the present invention, since the speaker drive switch and the
fan drive switch are mechanically interlocked and no relay or the like is used, the structure can
be simplified and can be implemented at low cost.
According to the third and fourth aspects of the present invention, the speaker drive switch and
the fan drive switch can be automatically turned on and off only by intermittently operating the
headphone input terminal to the headphone output terminal, and the operation is simple.
According to the fifth aspect, the driving of the fan can be controlled according to the level of the
output signal of the amplifier at the time of driving the speaker, and the noise of the fan may not
be disturbed at the time of small volume reproduction.
[0029]
Brief description of the drawings
[0030]
1 is a circuit diagram showing a first example of the embodiment of the present invention.
[0031]
2 is a circuit diagram showing a second example of the embodiment of the present invention.
[0032]
Explanation of sign
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[0033]
2L, 2R Power amplifier 3L, 3R Speaker drive switch 4L, 4R Speaker 5L, 5R Headphone output
terminal 7 Headphone jack 8 Heat sink 9 Headphones 11L, 11R Input terminal 13 Plug 15 Fan
drive circuit 16 Fan 17 Signal level detection circuit 18 Fan Driving switch 25 interlocking means
26 interlocking means for speaker driving switch 27 interlocking means for fan driving switch
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