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JPS58131900

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DESCRIPTION JPS58131900
[0001]
The present invention opens to an electrostatic-type sound-instrument converter that can be
used for sound-text reproduction rice. An electrostatic sound 41ii converter is known which
consists of 7'c 2 parallel rigid perforated insulating plates coated on the inside with a low
resistance conductive layer. Each of the conductive layers has a signal terminal connected to an
audio signal source. A flexible high resistance film having a terminal separated from the
conductive layer and connected to the polarized turtle EE source is fixed between the two
insulating plates. This transducer has the disadvantage that the spatial radiation properties can
not be adjusted and controlled. Also, in other electrostatic conversion transducers having two
parallel hard perforated insulating plates whose inner surfaces are coated with a low resistance
conductive layer, the conductive layers are divided into concentric rings separated from each
other The rings are connected in series via a resistor and a series connected coil. The central disk
has signal terminals connected to an acoustic frequency signal source. A flexible conductive high
resistance layer is attached between the insulating plates, and the film is insulated from the
conductive layer and has a terminal connected to a polarization voltage source. This converter
has the disadvantage that it is complex in structure and its frequency and space characteristics
change step by step, which leads to irregular reproduction. It is an object of the present invention
to provide an electrostatic acoustic transducer capable of smooth adjustment control of spatial
radiation characteristics and having a simple structure having uniform spatial and frequency
characteristics. According to the invention, it comprises two parallel perforated insulating plates,
the inner surfaces of which are coated with a conductive layer, each conductive layer having a
signal terminal connected to a signal source of sound 9i11 frequency. In an electrostatic voice
mail converter, in which a flexible conductive film having a terminal isolated from a conductive
layer and connected to a polarization voltage source between the insulating plates is fixed, at
least on one of the insulating plates It is characterized in that the conductive layer is of high
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resistance. The high resistance conductive layers may be in electrical contact with each other and
divided into a plurality of regions having different surface electrical resistances, and the signal
terminals are connected to the region producing the lowest surface electrical resistance. . It is
desirable that the surface electrical resistance of the region be gradually increased. In this case, it
is preferable that the electrical resistance of the region increases from the center to the
periphery. Embodiments of the present invention will be described below with reference to the
drawings. The electrostatic voice signal converter shown in FIG. 1 comprises two parallel hard,
perforated insulation ML1 and 2 whose inner surfaces are coated with conductive layers 4 and 5,
respectively. Conductive layers 3 and 4 have signal terminals 5 and 6 connected to an acoustic
signal source (not shown) through the central portions of perforated insulating plates 1 and 2,
respectively.
A flexible conductive film 7 is fixed between the insulating plates 1 and 2 and this film is
separated from the conductive layers 3 and 4 by a separator 8. The membrane 7 has a terminal 9
connected to a polarization voltage source (not shown). The conductive layer 3 is of high
resistance, while the conductive layer 4 is of low resistance. Also, both of the conductive R 43
and R 40 can be made highly resistive. As shown in FIG. 2, the perforated insulating plate is
circular, and the surface resistivity of the high resistance conductive layer 30 is uniform over the
entire surface. In FIG. 3, the high resistance conductive film 3 is divided into a plurality of regions
10 in electrical contact, the surface electrical resistance of each region is different, and the
terminal 5 is connected to the region having the lowest surface electrical resistance. Be done. The
surface electrical resistance of the region JO may be increased, for example, gradually from the
central portion to the peripheral portion (in the example of FIG. 4, the perforated insulating plate
l is rectangular and high resistance Is the surface electrical resistance of each of the 0 regions 10
divided into the regions 10 in the form of nutripes in electrical contact with each other being
different from each other and gradually increasing from one end to the other? Alternatively, it
may be gradually increased from the center to the periphery. In the example of FIG. 5, the
perforated insulating plate 1 is coated with a spiral shaped still resistive conductive layer 3 to
achieve an inductive property with distribution parameters. Holes may be drilled between the
coils of the duplex, and the surface electrical resistance of the conductive layer 3 may be uniform
over its entire length or may gradually increase from the center to the periphery. In the
converter, the membrane 7 is connected by the terminal 9 to the polarization voltage source 12
and the conductive layers 3 and 4 are highly resistive and have resistances R /, R //, 几 ′ ′
gradually increasing from one end to the other. ', ... R has. The signal terminals 5 and 6 are
connected to the secondary winding of the transformer 14, whose primary winding is connected
to an acoustic frequency signal source (not shown). In the converter of FIG. 7, the membrane 7 is
connected to the polarization voltage source 12 via the terminal 9 and the conductive layer is of
high resistance and gradually increases from one end to the other surface electrical resistance 几
/, 1モ / I, R /// ... R is included. Layer 4 is of conventional low resistance and its signal terminal 6
is connected to any point of the conductive layer 4. Signal terminals 5 and 6 are connected to the
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primary winding of transformer 14. The operation of the sound w converter will be described. A
polarization voltage source 12 charges a capacitor formed by the membrane 7 and the electrodes
comprising the layers 3 and 4. The film 7 is influenced by the constant electric field produced by
the polarization voltage source J2 and also by the alternating electric field produced by the
alternating voltage applied to the signal + J terminals 5 and 6.
The film 7 in FIGS. 6 and 7 and the resistor R 'formed by the capacitor and the high-resistance
conductive layers 3 and 4 formed by the conductor 3 * 4. The time constant of the circuit
consisting of i (//, {circle over (1)} clll... R k. As a result, the area 10 with low surface electrical
resistance emits sound within the total acoustic frequency range, and the area with high surface
electrical resistance limits the sound emission of higher frequencies. According to the invention
described above, the change in the surface electrical resistance of region 10 causes all the
questions about the transducer and Ji! d #: It is possible to control and adjust uniformly with a
simple method of hospitality 0
[0002]
Brief description of the drawings
[0003]
Fig. 1 is a top view of the 靜 form-phone letter converter, Fig. 2 is a top view of an insulating
plate with a high-resistance conductive layer broken and having a uniform surface electric
resistance, Fig. 3 surface resistance Is a top view of a resistive conductive layer or a coated
insulating plate because it is divided into different numbers of concentric circular acids, FIG. 4
shows that the high resistive conductive layers are in electrical contact with each other and differ
Top view of insulating plate divided into a plurality of stripes with narrow surface resistance, Fig.
5 is a top view of insulating plate ringing squisile high resistance conductive layer, Fig. 6 is both
insulating plates high The equivalent circuit diagram of an acoustic transducer coated with a
resistive conductive layer, and FIG. 7 show that one insulating plate is coated with a high
resistive conductive layer and the other insulating plate is coated with a low resistive conductor t
#. It is an equivalent circuit diagram of the acoustic transducer.
1.2 · · · perforated R plate, 3.4 · · conductive layer, 5 ° 6 · · · signal terminal, 7 · · · flexible
conductive film, 8 · · · separator, 9 · · · · · · Terminal, JO ... multiple areas. Applicant Agent Patent
Attorney Suzue Takehiko 9 63
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