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JPS4917286

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DESCRIPTION JPS4917286
■ Capacitor type transducer equipped with sensitivity adjustment device Japanese Patent
Application No. 45-22012 [Phase] Application A 45 (1970) March 17 @ Inventors Shoji
Watanabe Shoji Watanabe 70 Yanagimachi, Kawasaki-ku, Yuki Ward Tokyo Shibaura Electric Co.,
Ltd. Yakushiji within the Yanagimachi Plant Nobuo Dojo Seki Hiroyuki Kawasaki-ku Kokumu
Toshiba Town 1 Tokyo Shibaura Electric Co., Ltd. General Research Institute ■ Applicable by
applicant
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a capacitor transducer with a
sensitivity adjustment device according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a capacitive
transducer comprising a sensitivity adjustment device. As is known, a capacitor type transducer
comprises a variable capacitor and a fixed electrode and a movable electrode, and further
comprises a member for applying an external mechanical vibration to the movable electrode to
convert mechanical vibration into capacitance change of the capacitor. Do. Therefore, if a DC bias
voltage is previously applied to the capacitor, a change in voltage corresponding to the change in
capacitance is obtained, and finally mechanical vibration is converted into an electrical signal. In
the known capacitor type transducer as described above, a large output can be obtained as its
characteristic. This output is easier to handle than small, but it is rather undesirable to make the
output too large due to the design of the amplifier connected to the transducer and other
reasons. You should set the level. The present invention is directed to the above point, and
provides a capacitor type transducer provided with a sensitivity adjusting device capable of easily
adjusting the transducer output level. An embodiment of a capacitor type transducer provided
with a sensitivity control device according to the present invention will be described in detail
with reference to the drawings. For example, a movable electrode 12 also formed of an electric
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conductor member is provided opposite to the fixed electrode 11 formed of a flat electric
conductor member. An electret (charging member) 13 is closely attached to one direction of the
fixed electrode 11, and a space 14 is formed between the surface of the electret 13 and the
movable electrode 12 in a predetermined relationship. Of course, the base of the movable
electrode 12 may be in contact with the surface of the electret 13. The base of the movable
electrode 12 will be described in detail later. The movable electrode 12 is disposed to be inclined
with respect to the surface of the fixed electrode 11 so that the space 14 of the surface of the
electret 13 and the direction of the 1JJ moving electrode 12 is wider in one direction. The
vibration transfer body 15 is connected to one end of the movable electrode 12, and the
vibration transfer medium 16 is connected to the tip of the vibration transfer body 15 (for
example, when the transducer of the present invention is used for a pickup for reproducing a
disk record) Made of gems and called record needles)] is attached. The other end of the ITJ
moving electrode, that is, the base, is appropriately attached and engaged with a fulcrum setting
member 17 which is one element of a fulcrum adjusting member. The fulcrum setting member
17 is connected via a connection mechanism 19 so as to be interlocked with a drive member 18
which is another element of the fulcrum adjustment member.
The connection mechanism 19 is the drive member 18 such as a screw, but when the member 18
is adjusted, the movement is transmitted to the fulcrum setting member 17 and the fulcrum
setting member 17 is shifted. [111111] EndPage: And various known techniques can be applied.
Further, the fulcrum setting member 17 and the drive member 18 may be constituted by an
integral member. In this case, the connection mechanism 19 is unnecessary. The features of the
movable electrode 12 associated with the fulcrum setting member 17 should be described. The
movable electrode 12 is of course made of an electrical conductor material, and may be a thin
plate of, for example, 1 mm in width and 2 mm in length, and the above material and shape so
that its natural vibration frequency is outside the audio frequency range The frequency
determining factor such as mass is appropriately selected. Such a movable electrode 12 holds the
inclined state in a bent shape at the end of the member 17 by the movement of the fulcrum
setting member 17. The angle of inclination is best about 15 degrees with respect to the surface
of the toe cord 20 in the case of sound reproduction. If the opposing area of the movable
electrode 12 and the fixed electrode 11 is constant, the capacitor capacitance value C formed
between the electrodes is also constant. However, in the present invention, since the fulcrum of
the movable electrode 12 shifts with the shift of the fulcrum setting member 11, the capacitance
value C also changes. The capacitor type transducer is taken out with the volume [111111], but
the sensitivity at this time is proportional to the ratio of ΔC to C. Therefore, the sensitivity can be
switched by changing the value of C in several stages. That is, the sensitivity can be selected
variously by changing C continuously or stepwise according to the transition of the fulcrum
setting member 17. As described above, according to the present invention, in the capacitor type
transducer, one of the fixed electrode and the movable electrode which form the capacitor is
shifted so as to effectively change the entire capacity of the capacitor. It is possible to obtain the
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sensitivity, that is, the output corresponding to each condition and other conditions.
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