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\ 21 Inventor 3, especially; ? applicants zip code ? ?-? Japan Patent Office published patent
publication ? JP 49-88507 ? release date-Sho 49. (1974) 8.23 Japanese Patent Application No.
4g-204 Application date date-7-(1972) f2.2. ! Request for examination not yet filed (all three
pages) Description 1, Title of the invention
Electro-acoustic transducer
The present invention relates to an electroacoustic transducer that is used as a microphone, an
earphone or the like. ? Conventional electroacoustic transducers, if arranged in the order from
the oldest, include electromagnetic, carbon, electrokinetic, electrostatic, piezoelectric,
semiconductor, etc. Is the electrostatic type, and the next is the electrodynamic type. Electrostatic
type is widely used at present because of its good properties and electrokinetic type because of
its ease of use. However, the J electrostatic type requires a power source for its use, and a special
preamplifier must be used because the impedance and impedance are too high. In order to attach
a moving coil with an external lead to the vibrator, there is a limit in improving the resonance
characteristics of the vibrator, the structure is complicated and it is difficult to use without a
matching transformer, and its manufacture is also There were drawbacks such as being
troublesome. The object of the present invention is to improve the drawbacks of these
conventional electroacoustic transducers, and to provide an electroacoustic transducer which is
easy to use and which has good characteristics and which is simple in structure and easy to
manufacture. It is in. The electroacoustic transducer according to the present invention is a
nonmagnetic conductor which forms a part or the whole of a vibrating body and independently
forms a closed current path by applying a bias magnetic field to direct a fixed coil. The relative
change of the magnetic field applied to the magnetic conductive material causes an induction
effect such as an eddy current, and this induction effect acts to reduce the change of the
magnetic field applied to the nonmagnetic conductor, and the vibrator moves. Then, the
converted electrical signal is obtained in the fixed coil, and when the signal type flow is applied
to the fixed coil, the vibration EndPage: 1 plate moves according to the signal. The reason for
using a nonmagnetic crucible as a conductor is to make effective use of the induction effect, and
as this nonmagnetic conductor, aluminum, copper, silver, gold, etc. which are light, have good
conductivity and are difficult to rust are used. Used. Next, an embodiment of the present
invention will be described. FIG. 1 shows an example used as a microphone, which can also be
used as a headphone or the like. The structure is such that a cylindrical magnet 4 is set up and
fixed to the bottom of an upper gap 6 made of soft magnetic material 5 and a coil 6 is wound
between the two, and the upper part is composed of a nonmagnetic conductor 1 It is closed by
the diaphragm 2. The diaphragm 2 is simple, for example, by using aluminum foil for cooking,
but if it is desired to improve its resonance characteristics etc., the conductive diaphragm used in
conventional electrostatic microphones, such as, for example, It is even more preferable to be
able to use a tension membrane etc. as it is and to make it easy for an induced current such as an
eddy current to flow to these.
For example, in the case of a tension film having a resin film such as polystyrene or mylar as a
base, a conductor 7 is deposited on its both surfaces, and a thick collector is deposited or plated
to enhance the induction effect. The space between the diaphragm 2 and the upper surface of the
magnet 4 is preferably smaller, particularly for a microphone or the like. Here, what is different
from the electrostatic type is that it is not the counter electrode ? that is brought close to the
diaphragm 2, but it is the end face of one of the poles and the magnet 4 around which the coil 6
is wound. The direct induction to the fixed coil 3 and the choice of the impedance of the fixed coil
cage from a wide range. FIG. 2 shows an example of the frequency characteristics obtained in the
audio area from those shown in FIG. The solid line is so. The broken line is a general frequency
characteristic of the conventional electrostatic type. From this figure, although the low region is
slightly reduced, it has characteristics as a whole that are equal to the electrostatic type, and in
terms of ease of use, it can be said that it substantially surpasses the electrostatic type. With
respect to electrokinetic forms, their superiority and inferiority become clear by retesting. In FIG.
3, the diaphragm 2 as described above is disposed between the magnet 4 and the fixed coil 3 and
is suitable for a microphone. In FIG. 4, an annular nonmagnetic conductor 1 is fixed to a portion
corresponding to the voice coil of a conventional electrodynamic speaker, and the fixed coil 5 is
present instead of the voice coil. , Suitable for speakers. In FIG. 5, the dome-shaped diaphragm 2
is formed by the nonmagnetic conductor 1, and this is suitable for a high-pitched speaker, a
small-sized speaker, a horn driver, a headphone and the like. FIG. 6 shows the use of a loop-like
fixed coil 3 and a plate-like or film-like magnet 4 polarized in the direction of thickness i, and is
suitable for a wall type speaker or the like. FIG. 7 shows a fixed coil 3.3 ? ? ? and magnets 4
and 4 ? arranged on both sides of the diaphragm 20 so that they can be used in push-pull
applications, widely applied to microphones, two beakers, headphones, etc. it can. In FIG. 8, a bias
magnetic field is applied by the electromagnet 8, and a direct current bias current and a negative
feedback current from the amplifier are superimposed on the coil 9 to flow, or a signal current is
made to pair with the fixed coil 3. Use to drain. FIG. 9 is a diaphragm 2 in which a soft or hard
magnetic material 10 is laminated on a nonmagnetic conductor 1 and is effective for converging
a magnetic flux passing through a closed current path formed by the nonmagnetic conductor 1.
In FIG. 10, the fixed coil 6 forms a resonance circuit of the high frequency oscillation circuit 11,
and an output 1 ░ 2 KFM signal of the oscillation circuit can be obtained.
Suitable for wireless microphones. Although the embodiment has been described above, the
electro-acoustic transducer according to the present invention does not require a moving coil
having an external lead wire as in the prior art or a power source of operation failure and can
easily obtain one having excellent characteristics. Its impedance can also be selected from a wide
range and it is very easy to use, and furthermore, its structure is simple, there is very little room
for failure, and its manufacture is easy, etc. Conventional electrodynamic and electrostatic types
as electroacoustic transducers It has excellent features that can be substituted for The electroacoustic transducer according to the present invention can be applied outside the area of audio.
In addition, although it is conceivable to use a magnet diode or the like instead of the fixed coEndPage: 2 file, this is not within the scope of the present invention unless there is a single fixed
4. Brief description of the drawings FIG. 1 is a cross-sectional view omitting details for explaining
an embodiment of the electro-acoustic transducer according to the present invention, FIG. 2 is a
view showing an example of its characteristics, FIGS. FIG. 10 is a cross-sectional view of an
essential part for explaining another embodiment. DESCRIPTION OF SYMBOLS 1 иии Nonmagnetic
conductor, 2 иии Vibration plate, 3 иии Fixed coil, 4 иии Magnet, 5 иии Soft magnetic material, 6 иии Upper
opening container, 7 иии Cone , 8: electromagnet, 9: its coil, 10: magnetic material, 11: high
frequency oscillation circuit, 12: its output. Figure 1, r Figure 'EndPage: ?
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