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JPS61109397

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DESCRIPTION JPS61109397
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound reproducing apparatus such as a compact and portable tape recorder. 2. Description of the
Related Art In recent years, a compact and portable tape recorder has been developed which is
capable of listening to reproduced sound not only by headphones but also by speakers. FIG. 5 is a
circuit diagram of a sound reproducing apparatus in a tape recorder or the like having a
conventional headphone jack and a built-in speaker, in which 1 is a voltage amplifier on the right
channel (hereinafter referred to as R channel) and 2 is a left Voltage amplifier on the channel
(hereinafter referred to as L channel) side, 3 is a power amplifier on the R channel side, 4 is a
power amplifier on the L channel side, 5 is a headphone jack, 6 is a speaker, 7, 8 and 9 are
headphone jacks Switches 7a, 8a, 9a are common terminals in the respective switches 7.8, 9 and
7b. sb and 9b are common terminals 7a and 8a shown in FIG. The upper terminals 9a, 7c, 8c and
9c are also lower terminals, and when a headphone plug is inserted into the headphone jack 6,
the common terminals 7a and 8a. 9a and the upper terminals 7b, ab, 9b are connected, and the
common terminals 7a, 8a, 9a and the lower terminals 7C, 8C, 9C are respectively connected if
the headphone plug is not inserted into the headphone jack 5 It is configured. Next, the operation
of the sound reproducing apparatus in a tape recorder or the like having a headphone jack and
incorporating a skater will be described. When a playback sound is to be heard from a tape
recorder or the like by headphones, a headphone plug is inserted into the headphone jack 5.
When the headphone plug is inserted into the headphone jack 5, the switch ends, and the
common terminals 7a and 8a 9a are connected to the upper terminals 7b and sb 9b. Therefore, a
signal applied to the input terminal of R channel (hereinafter referred to as R channel signal, a
signal amplified by voltage amplification unit 1 and power amplification unit 3 and applied to the
input terminal of L channel (hereinafter referred to as R channel signal) Is amplified by the
voltage amplification unit 2 and the power amplification unit 4. The signals amplified
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independently by the respective signal amplifiers are input to the headphones connected to the
headphone jack 5 and converted into audio signals by the headphones. On the other hand, when
the headphone plug is not inserted into the headphone jack 5, the switches 7.8 ░ 9 are
connected to the common terminals 7a, 8a, 9a and the lower terminals 7C, 8C, 9C.
In this case, the R channel signal and the R channel signal are mixed by the switch 7, and the
mixed signal is amplified by the voltage amplification unit 1 on the R channel side. Since the
power amplification unit 3 on the R channel side and the power amplification unit 4 on the L
channel side are BTL connected by the switch 8 and the switch 9, the mixing signal output from
the voltage amplification unit 1 on the R channel side is sufficient. Power and is converted into
an audio signal by the speaker 6. Problems to be solved by the invention However, in the
conventional configuration, since the power amplification unit 3.4 is connected by BTL, a large
number of switches and resistors interlocked with insertion and removal of the headphone plug
in the headphone jack 5 are used. I needed it. Therefore, the wiring of the power amplifier part of
the printed circuit board becomes complicated. The present invention has been made in view of
the above-mentioned drawbacks, and it is an object of the present invention to provide an audio
reproduction apparatus in which the number of parts of the power amplifier is reduced in a tape
recorder or the like having a headphone jack and incorporating a speaker. Do. Means for Solving
the Problem Two voice coils are provided in the speaker, the terminal with one end of the two
voice coils connected in common is connected to ground, and the other terminal is connected
with the internal switch of the headphone jack. They are respectively connected to the signal
amplification units of two channels. When a headphone plug is not inserted into the headphone
jack, a switch k n Irj for mixing the signals input to the signal amplification units of two channels
is set. Operation The effects of this technical means are as follows. In the case of reproducing the
sound with headphones, if a headphone plug is inserted into the headphone jack, the input signal
is amplified and output independently. If a headphone plug is not inserted into the headphone
jack, the signals input to the signal amplification units of two channels are mixed. Then, the
mixed signal is amplified by the power amplification unit on the R channel side, and drives the
first voice coil of the speaker. Similarly, the mixing signal is amplified by the power amplification
unit on the L channel side, and the second voice coil is driven. As a result, a large audio output
can be output from the speaker, and it is not necessary to connect the power amplifier units to
each other by BTL. Embodiment Hereinafter, an embodiment of the present invention will be
described with reference to the drawings. FIG. 1 is a circuit diagram of a sound reproducing
apparatus in a tape recorder or the like having a headphone jack and a built-in speaker, and the
same members as those of the apparatus shown in FIG.
10 is a headphone jack having two internal switches, 11 iss beaker, 12 is a first Heus coil
provided in the speaker 11, 13 is in the speaker 11 and can not be wound in reverse with the
first voice coil 12 2 voice coil, 14 is an input terminal commonly connected to one end of a pair
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of the first voice coil 12 and the second voice coil 13, and 15 is the other end of the first voice
coil 12. The input terminal 16 is an input terminal connected to the other end of the second
voice coil 13, and the input terminal 14 connected in common is connected to the ground. The
other input terminal 15 ░ 16 is via the two internal switches of the headphone jack 10, and the
input terminal 15 is on the R channel side. Although the switches 8 and 9 for BTL connection,
which are in the conventional device, are eliminated, the switch 7 for mixing the R channel signal
and the L channel signal is required if the headphone plug is not inserted into the headphone
jack 10. That size is provided. FIG. 2 is a cross-sectional view of the speaker 11 in FIG. 1, and the
same members as those of the device in FIG. Reference numeral 17 denotes four lead wires of the
first voice coil 12 and the second voice coil 13 connected to the input terminals 14 and 16.16,
18 denotes a yoke, 19 denotes a plate, 20 denotes a permanent magnet, 21 Is a frame, 22 is corn
paper, and 23 is a camp. 3 is a partially enlarged view of the voice coil 12.degree. 13 portion and
the input terminals 14 and 15. 16 portions of the speaker 11 shown in FIG. 2, and the same
members as the device shown in FIGS. 1 and 2 are shown. Have the same sign. Reference
numeral 24.25 denotes a lead m at both ends of the first voice coil 12, and 2s + 27 denotes lead
wires at both ends of the second voice coil 13. ? ???????????????░? First, in
the case of (8) reproducing sound with ? ииииииииииииииии in Fig. 1, a headphone plug is inserted into the
headphone jack 10 as in the conventional case. When the headphone plug is inserted, the switch
7 is thereby connected to the common terminal a and the terminal 7b of the king system.
Therefore, the R channel signal and the L channel signal are amplified independently and
converted to sound by the headphone. Be done. On the other hand, if a headphone plug is not
inserted into the headphone jack 10, the switch 7 is connected to the common terminal 7a and
the lower terminal 7C. Therefore, the R channel signal and the L channel signal are mixed by the
switch 7.
The mixed signal is amplified by the voltage amplification unit 1 on the R channel side and the
power amplification unit 3 and input to the input terminal 15, and is also amplified by the
voltage amplification unit 2 on the L channel side and the power amplification unit 4 It is input to
the input terminal 16. Next, the operation of a part of the speaker will be described with
reference to FIGS. When the signal amplified by the signal amplification unit is input to the input
terminal 15.16, the voice coil 12 from each of the lead wire 24 of the first voice coil 12 and the
lead wire 27 of the second voice coil 13 connected to each of them. A signal is transmitted to .13.
If the phase of the signal applied to input terminal 1 o иии child 15 and the phase of the signal
applied to input terminal 16 are the same, first voice coil 12 and second voice coil 13 are yoke
18 And the plate 190 receive the same electromagnetic force in the direction perpendicular to
the winding direction by the permanent magnet 20, vibrate the cone paper 22 and the camp 23
attached to the frame 21, and output the voice from the speaker 11. The in-phase signal mixed
by the switch 7 is input to the first voice coil 12 and the second voice coil 13, so that the audio
output from the speaker 11 is on the R channel side and the L channel side. It appears as the
sum of the outputs of the respective power amplification units 3 and 4. Therefore, even if the
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power amplification units 3 and 4 on the R channel side and the L channel side are not BTL
connected, the output from the speaker 11 can be made sufficient. The voice coil portion of the
speaker 11 can also be as shown in FIG. FIG. 4 is a perspective view showing another form of the
voice coil portion of the speaker 11 in the present embodiment, 28 is a first voice coil, 29 is a
first voice coil outside the first voice coil 28. It is a voice coil of mud 2 wound in the same
direction as 28. Each lead of the voice coil 28.29 is connected to the input terminal 14 shown in
FIG. 3 with the upper side or the lower side in common, and the lead at the other end of each is
connected to the input terminal 15.degree. Scold. Even with such a configuration, the first voice
coil 28 and the second voice coil 29 vibrate in the same direction, and the mixed signal is
converted into voice. The output from the speaker 11 appears as the sum of the outputs of the
power amplification units 3 and 4 on the R channel side and the L channel side, as in the case of
using the voice coil shown in FIG. The present invention provides a terminal in which one end of
two voice coils is connected in common and a terminal in which the other end is connected, and
the latter terminal is the output side of the power amplifier on the R channel side and the L
channel side. Are connected to each other via two internal switches in the headphone jack.
Therefore, when outputting audio by the speaker, the sum of the outputs of the power
amplification units on the R channel side and the L channel side is output, and it is not necessary
to BTL connect the power amplification units. Therefore, the present invention does not require a
large number of switches as in the conventional device in which the power amplification units
are connected by BTL, the number of parts of the power amplification units can be reduced, and
the wiring on the pre / 1 board can be facilitated It has the effect of being able to
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a circuit diagram of an acoustic reproducing apparatus showing an embodiment of the
present invention, FIG. 2 is a sectional view of a speaker used in the apparatus shown in FIG. 1,
and FIG. 3 is a voice of a sous beaker shown in FIG. FIG. 4 is a partially enlarged view showing
another example of the voice coil portion of the speaker shown in FIG. 2, and FIG. 5 is a circuit
diagram of a conventional sound reproducing apparatus. .
1.2 и и и и и и и voltage amplification unit, 3, 4 и и и power amplification unit. 7 ииииииииииииииии 1o иииииииииии
Headphone jack, 11 ииииииииииииииииииииииииииии First voice coil, 13 ииииииииииииииии Voice coil 14, 15, 16
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ииииииииииииииииииииииииииииии First voice coil, 29 иииииии Second voice coil. Name of agent Attorney Nakao Toshio
and 1 other person ? Bespoke Figure 3 Figure 5
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