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JPH0194000

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DESCRIPTION JPH0194000
[0001]
(1) The present invention is an ion speaker using a high voltage discharge, which has an effect of
counteracting noise generated by the discharge and enhancing the change of high voltage caused
by the audio signal. This invention relates to a driving device for controlling high voltage
generated in a secondary circuit by utilizing the frequency characteristic of the resonant circuit
of the secondary circuit of the step-up transformer with less deterioration of the frequency
characteristic inside the circuit due to the structure and modulation. . (2) In the past, high voltage
was used for the ion speaker in the past, so the discharge noise was a bit confusing, so if you try
to reduce the noise, you have to lower the voltage and reduce the efficiency. There was a
contradictory drawback of falling. Furthermore, the control method in the case of controlling the
high voltage by the audio signal 1. The discharge voltage could not be set high due to the
problem of the frequency characteristics etc. when the winding ratio of the step-up transformer
is increased. It is difficult to increase the size, and the conversion efficiency is poor. (3) The
present invention is intended to eliminate the above-mentioned drawbacks of the ion speaker,
and is roughly divided into an electrode structure and a drive device. As shown in 1 of FIG. 1, the
electrode plate 1 is made of a conductive material having a plurality of circular holes and the
inside of the holes has a structure that allows air to pass freely. ing. The electrode 2.3 is
composed of a plurality of needle-shaped conductive materials whose tip area is as small as
possible, and high voltage is applied to these electrodes from the secondary circuit of the step-up
transformer 9.10 shown in FIG. Here, the high voltages of these electrodes are applied in phase
to the carrier component of the frequency modulation wave, so from the respective electrode 2.3
of the conical discharge towards the electrode 1 It is considered that the air-dense state caused
by the flowing discharge film is the same state with the electrode plate I as a boundary, so the
air-dense state passes through the circular holes of the electrode plate 1 and the inside of the
conical discharge film Act to cancel each other. On the other hand, since the audio signal
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component is applied in the opposite phase by the driving device, the audio signal components
are mutually enhanced within the conical discharge film, contrary to the above-mentioned
operation. Work-for example, if the air-dense part is made by the pole 2 of the first figure, the air
will be devoided in the part of the electrode 3 and the air flow is one way in the circular hole of
the electrode plate 1 Flow amplification. Next, in the drive device for controlling the ion speaker,
according to the present invention, the audio signal is frequency-modulated and added to the
primary coil L1 + LI 'of the transformer 9 ° 10 shown in FIG.
The secondary coils of IO are respectively configured as a resonant circuit by F2C2 and L2'C2 ".
As shown in FIG. 3, the resonant frequency of the resonant circuit configured by F2C2 and L2'C2
DEG is F2. Assuming that F2 'represents a resonance curve as shown in FIG. 4, where F2'p21 is
the center frequency F of the frequency modulation wave. Further slightly shifted, appropriate
positions of bJ and b'c 'darkness on the resonance curve in which the relationship of F2 <PG <P2'
is established, for example, a. If it is set so as to come to a ′ ′, then if the frequency modulation
wave shifts to + ΔF according to the audio signal in this state, the terminal voltage of F2
decreases and the terminal voltage of F2 moves upward, in other words, Then, according to the
frequency shift ± ΔF corresponding to the audio signal, the secondary coil terminal L2. The 180
° heterotrileite voltage of each phase is generated in L2 ′ ′, and the carrier wave component
of the frequency modulation wave is in phase, so that the terminals of L, ° are connected to
discharge noise. Try to erase each other. (4) As a specific electrode structure, a needle having a
sharp tip is used for the electrodes 2 and 3 shown in FIG. 1, and a copper plate is used for the
electrode plate 1, and about 350 circular holes are opened. As shown in FIG. 3, the driving device
has a structure in which the electrode plate 1 is swallowed by the electrode 2.3. As shown in FIG.
3, a multibibreak is used for conversion from amplitude modulation to frequency modulation,
and resonance of the transformer secondary circuit The frequencies were set at points a and a
'on the resonance curve of FIG. 4 and two independent step-up transformers were used. In
addition, there exist the following as an embodiment which controls a high voltage. (() A method
of phase modulating an audio signal to control a high voltage. (Tl) A method of pulse-modulating
an audio signal to control a high voltage. B) As shown in FIG. 5, it is a method of converting an
audio signal component modulated by −degrees into an optical signal again and adding it as a
bias signal of an output transistor whose resistance is improved by connecting in series. In this
case, a semiconductor element 25 for converting an electrical signal to an optical signal and a
semiconductor element 26 for converting an optical signal to an electrical signal are used. The
output transistors 30 and 31 have a resonant circuit composed of L and C, and perform the
operation described in the text. (5) According to the present invention, the discharge noises
mutually cancel each other, and the audio signal components are mutually enhanced. This has
the dual effect of increasing the efficiency and reducing the noise while increasing the efficiency.
As shown in FIG. 3, since this circuit can be modulated by a low level audio signal, the
characteristic degradation of the audio signal is small, and since the audio signal is modulated
and transmitted, it is hardly influenced by the frequency characteristic of the transformer or the
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circuit. The winding ratio of the transformer can also be designed large and efficiency can be
improved, so these synergetic effects make it possible to make a wide dynamic range Io ′
'speaker with less discharge noise.
[0002]
Brief description of the drawings
[0003]
1 is a front view of the present invention, FIG. 2 is an oblique view of the electrode portion of the
present invention, and FIG. 3 is a circuit diagram of the drive device of the present invention. FIG.
4 is a resonance curve of the present invention. Circuit diagram of driving device to convert and
control 1: Electrode plate 2, 3; Needle electrode 4: Conical discharge film 5: Audio signal 6: Multibibreak 7: L, 8: LI "9. 10: Step-up transformer IN C212: C2'13: to electrode 2 14: to electrode 3
15: to electrode plate 1 161 transmission frequency F.
17: frequency modulation wave 18: amplitude modulation wave 19: b point 20: a point 21: c
point 22: b 'point 23: a' point 24: c 'point 25: optical signal conversion element 26: electrical
signal conversion element 27 : High positive DC power supply 28: L229: L2 ′ ′ 30. 31: Output
transistor
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