JPS4828282

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DESCRIPTION JPS4828282
■ Conden t W) Lance Jucera Japanese Patent Application No. 44-644030 Application No. 44
(1969) August 15 @ Inventor Shoji Watanabe Shoji Watanabe Kawasaki City Ku-ku 70 Yanaicho
Tokyo Shibaura Electric Co. Tokyo Shibaura Electric Co., Ltd. Kawasaki-ku, Kawasaki-ku
Horikawacho 720 agent patent attorney Takehiko Suzue 4, outside
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing a capacitor type
pick-up cartridge provided with a capacitor type transducer according to an embodiment of the
present invention, and FIG. 2 is a plan view showing principal parts of FIG. FIGS. 3 and 4 are plan
views showing other modified examples of the main part of the device of the present invention.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a capacitor transducer for use in a capacitor pick-up cartridge or capacitor microphone.
Capacitor type transducers apply the nature of capacitors. When a pair of electrode plates is
opposed to the capacitor and a voltage is applied between the electrode plates, charges are
accumulated between the electrode plates. There is the following relationship between the stored
charge Q (coulomb), the applied voltage V (volt), and the capacity C of the capacitor (farad-clone
/ volt). Q = C-V (1) where C is the effective opposing area S of the two electrode plates facing
each other, and between the electrode plates Is expressed by the relational expression of distance
d. That is, [111111] ε represents the dielectric constant of the dielectric between the two
electrode plates. In order to construct a so-called transducer that converts mechanical vibration
into an electric vibration signal by utilizing the properties of the capacitor as described above, C
is mechanically changed according to equation (1). I know that I should do it. Furthermore, in
order to specifically change C, that is, the capacitance of the capacitor, it is necessary to change
the distance d between the two electrodes constituting C or to change the opposing area S as
seen from the equation (2). Is made. Generally, when operating as a transducer, it is usual to
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change the facing area S. The movable electrode is vibrated by mechanical vibration by using the
electrode plate of one of the two electrode plates as a fixed electrode and the other electrode
plate as a movable electrode. In response to the vibration. Thus, mechanical vibration can be
converted into an electrical signal. There are several types of capacitor transducers. A so-called
frequency modulation transducer, which operates as a capacitor of a tuning circuit in a frequency
modulation oscillation circuit, for example, to cause frequency modulation, the capacitor acts as a
kind of impedance for alternating current by its nature From this, it is an impedance modulation
type transducer, and further, a DC bias type transducer which applies a DC bias voltage and
extracts an oscillating voltage. As described above, it can be divided into transducers of various
types according to the method of operation and the attached circuit, but in any case, the
capacitor itself changes the distance d between the two electrode plates which are components,
or d change type or The object can be achieved by performing either of S change type in which
the facing area S of the two electrode plates is changed [111111] EndPage: 1.
The capacitor type transducer as described above brings the fixed electrode and the movable
electrode close to each other and a dielectric is interposed therebetween, and the movable
electrode vibrates to change the distance or the facing area between the fixed electrode and the
fixed electrode. Although it is configured to change the capacitance between each other, it can be
understood that it is better to use a dielectric material with a high dielectric constant ε in order
to obtain a large capacitance as understood from the equation (2). Ru. However, if a dielectric
material with a high dielectric constant E is used to increase the capacity with such a capacitor
type transducer, the dielectric material with a high dielectric constant E has a low insulation
resistance, so for example, the electric power emitted from the movable electrode In addition to
reaching the fixed electrode via the dielectric to the fixed electrode at the shortest distance, an
electric line of force is generated which circulates outside the dielectric and reaches the fixed
electrode at the end of the electrode. It is called a line of force. For this reason, the capacity
between the fixed electrodes can not be sensitively changed with the vibration of the movable
electrode, and the conversion efficiency for extracting the electric output decreases by changing
the capacity between the fixed electrodes with the vibration of the movable electrode. It occurs.
An object of the present invention is to provide a capacitor type transducer capable of solving the
above problems and increasing the signal conversion efficiency between electric and mechanical
signals. The following will describe the case where one embodiment of the present invention is
applied to a capacitor type pickup cartridge. As shown in FIG. 1, a through hole (not shown) is
formed in a predetermined position of the lower surface plate 120 in the cartridge housing 11.
Ru. Further, the rear end side of the cantilever 14 is swingably supported by the damper 15 in
the cartridge housing 11. In this case, the front end side of the cantilever 14 is drawn out of the
cartridge body 11 through the through hole and the front end A record needle 16 is attached to
the unit. A lower end portion of an armature 17 having a shape (for example, a pipe, a rod, etc.)
necessary for transmitting vibration is connected to the movable abdomen of the cantilever 14 so
as to be communicable, for example integrally with the upper end of the armature 17. The
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movable electrode 18 is integrally provided. A fixed electrode 19 is closely opposed to the
movable electrode 18, and the fixed electrode 19 is fixed to the inner surface of the upper
surface plate 20 of the cartridge housing 11. A dielectric [111111] is formed on the opposite
surface to the movable electrode 18. The body material 21 is disposed. This dielectric material
21 is, for example, interposed between the first dielectric layer 25 having a high dielectric
constant and a small insulation resistance and the center in the thickness direction of the
dielectric layer 25 as shown in FIG. The second dielectric layer 26 has a large size.
In this case, in particular, the second dielectric layer 26 extends like an edge so as to cover the
edge of the first dielectric layer 25 (the end face perpendicular to the movable electrode 18 and
the fixed electrode 19). . Further, the movable electrode 18 and the fixed electrode 19 are
connected to external lead-out terminals 24, 24 protruding from the rear plate 23 of the
cartridge body 11 through the lead wires 22, 22, respectively. For example, it can be connected
as a capacitor of a tuning circuit of a capacitor type transducer high frequency oscillator by
frequency modulation system. That is, in the capacitor type pickup cartridge configured as
described above, when the record needle 16 scans and vibrates on the record board (not shown),
the movable electrode 18 integrally moves via the cantilever 14 and the armature 17. The
capacitance between the fixed electrode 19 changes, and this capacitance change is taken out as
an electrical output. By the way, in the capacitor type transducer according to the present
invention, the dielectric material 21 is interposed at the center in the thickness direction of the
first dielectric layer 25 having a high dielectric constant and a small insulation resistance, The
second dielectric layer 26 having a large dielectric resistance and a low dielectric constant is
formed, and the second dielectric layer 26 is formed in a bowl shape so as to cover the edge of
the first dielectric layer 25 at the end. It is formed. Therefore, the insulation between the movable
electrode 18 and the fixed electrode 19 at the end face of the dielectric material 21 is extremely
high due to the second dielectric layer 26. As a result, at the electrode end, for example, the
movable electrode The so-called edge effect in which the electric lines of force emerging from 18
bypass the dielectric material 21 and reach the fixed electrode 19 is prevented. Therefore,
according to such a capacitor type transducer, the use of the second dielectric layer 26 having a
high insulation resistance as the dielectric material 21 prevents the edge effect, and as a result,
the movable member is movable. As the electrode 18 vibrates, the capacitance between the fixed
electrodes 19 sensitively changes, and the conversion efficiency increases. Also, in this case,
since the first dielectric layer 25 having a large dielectric constant is used together with the
second dielectric layer [111111] EndPage: 2, the capacitance between the movable electrode 18
and the fixed electrode 19 is Fat (can be taken. Furthermore, the second dielectric layer also
serves to support the first dielectric. FIGS. 3 and 4 show another embodiment of the present
invention. In the case of FIG. 3, a pair of second dielectric layers 26 is provided with the first
dielectric layer 22 interposed therebetween. In the case of FIG. 4, the end face of the first
dielectric layer 25 is covered with the second dielectric layer 26 formed on the side surface of
the fixed electrode 19 of the first dielectric layer 25.
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However, even with this configuration, it operates in the same manner as the above embodiment
and produces the same effect. In the above embodiment, the movable electrode 18 may slide on
the surface of the fixed electrode 19 in accordance with the vibration. [111111] Furthermore, the
present invention can also be implemented to a condenser type microphone or the like in
addition to the condenser type pickup cartridge. As described above in detail, according to the
present invention, it is possible to provide a capacitor type transducer which can have a high
conversion efficiency (and can have a large capacity.
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