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DESCRIPTION JPH0313100

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DESCRIPTION JPH0313100
[0001]
[Industrial field of application] The present invention locates a voice coil in a magnetic gap in a
magnetic circuit and drives a voice coil according to a signal waveform by supplying a signal
current to the voice coil to mount the voice coil. The present invention relates to the
improvement of a speaker device which vibrates a vibration plate and propagates its wave to the
air. [Prior Art and its Problem] In this type of speaker device, when the signal current from the
amplifier flows to the voice coil, a potential is generated electrostatically in the magnetic circuit
through the magnetic gap. Then, since the current to the voice coil changes and the voice coil
moves back and forth, the capacitance changes, so the balance with the potential in the magnetic
circuit described above is lost, and the magnetic circuit reverses to the voice coil. A current flows
electrostatically, and this current overlaps with the input current to the voice coil and disturbs
the waveform. However, in the conventional speaker apparatus of this type, since no measure is
taken against this, the signal waveform is reproduced as it is disturbed, and there is a drawback
that faithful reproduction can not be performed. OBJECTS OF THE INVENTION It is a first object
of the present invention to provide a speaker device capable of faithful reproduction to a signal
waveform by reducing such disturbance current flowing in a voice coil. The second object of the
present invention is to prevent the occurrence of short circuit or disconnection due to the voice
coil coming into contact with the magnetic circuit by rolling or the like in the magnetic gap.
[Means for achieving the object] The present invention relates to a means for a speaker device
for achieving the above-mentioned object, a conductive circuit such as a magnetic circuit of a
speaker and a frame, and an input terminal connected to the O terminal of an amplifier. Or
electrically connected to a ground terminal provided on the main body so as to be connected to
the earth ground. In particular, when the speaker is an external magnet type speaker using
ferrite, it is desirable to provide a terminal for connection to the input terminal and the ground
terminal in a pole yoke. [Operation] The speaker device of the present invention is connected to
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the ground terminal of the magnetic circuit generated by the signal current flowing through the
voice coil, the input terminal connected to the ? terminal of the amplifier connected to the
ground, and the ground terminal. By electrically connecting the magnetic circuit to the ground
terminal, the current is prevented from flowing from the magnetic circuit back to the voice coil,
thereby preventing disturbance to the input signal current. In particular, in a speaker unit having
a ferrite external magnetic type magnetic circuit, the voice coil contacts the plate portion by
rolling etc. by providing a terminal for connection to the input terminal and the ground terminal
on the pole yoke. Also, since the ferrite magnet intervenes, the voice coil is electrically protected,
and on the inside, the voice coil is electrically protected by the voice coil bobbin on which the
voice coil is wound.
[Embodiment of the Invention] Next, an embodiment of the present invention will be described
with reference to the two-way speaker apparatus shown in FIG. This 2-way speaker device is
composed of woofer 1 and tow ita-2, which are connected to the n terminal and ? terminal on
the output side of the amplifier n Low pass filters on input terminal 3 and e input terminal 4
respectively It is connected via the LPF1 bypass filter HPF. At the same time, the magnetic circuit
of the woofer 1 and the tow wing 2 is connected to the e input terminal 4. Therefore, even if a
potential is induced in the magnetic circuit by the signal current flowing in the voice coil of
woofer 1 and tow iter-2, the potential of the magnetic circuit is set by the electrical connection
between the magnetic circuit and the O input terminal 4. , Is pulled down to the ground potential
of the amplifier. Therefore, even if the signal current changes, no current is induced in the voice
coil by the potential of the magnetic circuit, and the signal current waveform is not disturbed. In
the embodiment of FIG. 2, the magnetic circuit of woofer 1 and tow ita-2 is connected to the O
side after leaving the low pass filter LPF and bypass filter HPF, and the operation and effect are
the same as in the previous embodiment. . In the embodiment shown in FIG. 3, the earth terminal
5 is provided in addition to the O input terminal 3 and the ? input terminal 4, and the magnetic
circuit of the woofer 1 and the tow iter-2 is connected to this. By dropping it to the earth ground
and keeping the magnetic circuit at the earth potential, the same function and effect as the old
winter example are produced. FIG. 4 shows another connection example with the amplifier 6 of
the embodiment of FIG. 3, and the output from the amplifier is connected to the input terminal 3
and the e input terminal 4 by the shielded lead wires 8 and 9. . The shield 7 is connected to the
ground terminal 5 and the shield 7 is grounded via the amplifier 6 or directly, so that the shields
of the lead wires 8 and 9 double as the ground of the ground terminal 5. . FIG. 5 shows that the
shield 11.12 of the low pass filter LPF and the bypass filter HPF is connected to the wire 10
connecting the woofer 1 and the tow inverter 2 and the ground terminal 5 in the embodiment of
FIG. Ground potential of the shield to enhance its shielding effect. When the input terminals of
the woofer 1 and the tow ita-2 are separately provided as shown in FIG. 6, the magnetic circuit
may be connected to the .theta..lambda. Human forceps 4a and 4b. In the case of one speaker, as
shown in FIG. 7, the magnetic circuit of the speaker 13 may be connected to the ? input
terminal 4.
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In particular, in the case of a speaker of an external magnetic type magnetic circuit in which a
ferrite magnet is used as the magnet 20 and a magnetic gap is formed between the ball yoke 21
and the plate 22 in contact therewith, as shown in FIG. It is desirable to provide the ball yoke 21
with a terminal 23 for connection to the input terminal 4 and the ground terminal 5. If the plate
22 is provided with the terminal 23, the voice coil 24 inserted in the magnetic gap is wound
around the outer surface of the voice coil bobbin 25. If a rolling phenomenon occurs during the
vibration of the diaphragm 25, the voice coil There is a risk of shorting the contact 24 to the
plate 22 and breaking or breaking. However, if a terminal 23 is provided on the ball yoke as
shown in FIG. 8, even if it is in contact, it is electrically protected by the bobbin inside the voice
coil. At this time, the potential on the plate 22 side is also lowered through the capacitance of the
magnet 20, so that the ball yoke 21. Even if the plate 22 is not grounded, the above-mentioned
effect can be achieved. FIG. 9 shows an apparatus for measuring the potential generated in the
magnetic circuit by the signal current flowing through the voice coil 24 so that the magnetic
circuits of the first speaker a and the second speakers a and b have the same potential. Both
speakers b17) electrically connect the magnetic circuit. The white noise generated by the white
noise generator C is amplified by the power amplifier d and input to the voice coil 24 of the first
speaker a. A data block e is connected to the voice coil 24 of the second speaker b via an FFT.
The magnetic circuit of the first speaker a is connected so as to be switched to the non-connected
state, the O terminal of the power amplifier b, and the ground by switching the changeover
switch Sw to the positions A, B, and C. Therefore, the current generated in the voice coil 24 of the
second speaker b can be displayed on the data plotter e by the potential induced in the magnetic
circuit by the white noise manually input to the voice coil 24 of the first speaker a. The
measurement results are shown in FIG. 10, and the value when the changeover switch Sw is at
the A position is represented by ?, the B position is represented by ?, and the C position is
represented by ?. As apparent from FIG. 10, the electromotive force induced is reduced by
connecting the magnetic circuit to the O terminal of the amplifier b and the ground terminal as
compared with the case of no connection, and the signal by this electromotive force is reduced. It
turns out that the disturbance of the current is prevented. In each of the above embodiments, the
low pass filter LPF used as the network circuit of the woofer 1 and the tow steerer 2, the case of
the circuit element of the bypass filter HPF, the negative input connected to the negative terminal
of the amplifier 6 etc. Terminal 4.4a.
The same effect can be obtained by connecting to 4b or to the earth ground. An example of an
electrostatically induced potential induced by a signal in the case or core of such a circuit
element is shown in FIG. In FIG. 11, when white noise is input to the circuit of FIG. 12, the voltage
generated across the resistor R is R, the voltage between the aluminum case of the electrolytic
capacitor C and the ground is C, and the boron steel plate of the choke coil L is Represents the
voltage between the core and the ground. As described above, the case of the electrolytic
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capacitor C and the core of the choke coil L are found to have potential by the signal current, but
the potential of the case and the core is reversed back to the signal to disturb the signal as
described above. It is similar to the relationship between the voice coil of the speaker unit and
the magnetic circuit, and therefore, it hinders faithful reproduction. This actual wiring is shown
in FIG. 13 and FIG. FIG. 13 shows an example of a bypass filter HPFO using an aluminum
electrolytic capacitor 25 and a choke coil 26 containing boron steel plate, which are induced by
lead wires connected to the point a of the electrolytic capacitor 25 and the point of the core The
potential is released to the negative side of the amplifier 6 to achieve stabilization. FIG. 14 shows
an example of a bypass filter HPFO using a film capacitor 27 and a ferrite drum choke coil 28.
The conductive adhesive metal foil 29 is stuck to the film capacitor 27 and the ferrite drum
choke coil 28, and the induced potential is ground. It is what has escaped to the potential.
Although the embodiments of the network element have been described above, other circuit
parts, for example, elements used in circuit devices such as CD players, audio recorders,
preamplifiers, power amplifiers, etc., signal recording, processing, amplification, etc. It carries out
similarly, and the same effect is acquired. As described above, according to the present invention,
the potential of the magnetic circuit induced by the signal current flowing in the voice coil is
released by connecting it to the ground terminal or the O output terminal of the amplifier
connected to the ground. Thus, the potential of the magnetic circuit can be kept constant at all
times. Therefore, it is possible to prevent generation of back electromotive force generated in the
voice coil in response to a change in the signal current, and it is possible to prevent the waveform
disturbance of the signal current due to this, so that reproduction faithful to the signal waveform
is possible. It becomes. When ferrite is used as the magnet of the magnetic circuit, the magnet
serves as insulation if the connection point to the ground of the speaker unit and the terminal of
the amplifier e are provided on the ball yoke to obtain the above effect. Even if there is rolling of
the voice coil at the time of vibration of the diaphragm or the like and there is a contact between
the voice coil and the ball yoke, short circuit between the voice coil and the plate can be
prevented.
[0002]
Brief description of the drawings
[0003]
1, 2 and 3 are circuit diagrams showing an embodiment of the present invention, and FIG. 4 is a
circuit diagram showing the connection between the embodiment of FIG. 3 and an amplifier, and
FIGS. 5 and 6 7 is a circuit diagram of another embodiment of the present invention, FIG. 8 is a
cross-sectional view showing an example of the terminal mounting position of the present
invention, and FIG. 9 is generated in the voice coil by the potential induced in the magnetic
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circuit. 10 is a characteristic diagram according to another embodiment of FIG. 12, FIG. 12 is a
circuit diagram, FIG. 13 is a circuit component, FIG. It is a perspective view which shows
arrangement | positioning of. !
иииииииии Woofer, 2 иииииииии 13 input terminals, 4 + 4 at 4 b иии O input terminals, 5 иии earth terminals, 6 иии
amplifier, 10 иии Line 13: Speaker.
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