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Description 1, title of the invention
Electro-acoustic transducer
3. Detailed description of the invention The present invention provides a needle-like discharge
electrode stored in a cylindrical electric insulating heat-resistant material '# L electrode holder
except for the tip area, and a distance from this discharge electrode And an opposing electrode
surrounding the discharge electrode, 1! An electro-acoustic transducer for converting air
vibration into air pressure fluctuation. Electro-acoustic transducers or speakers which operate
without vibration analysis are known under the name "Ion 7-on". Sound waves are generated by a
strong corona discharge. This corona discharge is modulated by an electrical signal that is to be
converted into sound waves. Corona discharge causes air pressure fluctuation. This device is
generally known from French Patent Publication No. 1041790 and a further application covering
it. In all known constructions of this electric-sound lllll converter which utilizes the corona effect,
it is arranged at the inlet of the converter or the exponential ho 7. This horn ultrasonic wave t-%
is directed in a fixed direction. The subject of the present invention operates on the same
principle as the transducers mentioned in wI head by using the 9 strongly modulated corona
discharge, which vibrates the ambient air and thus enables the emission of sound waves, but all It
is to provide an electro-acoustic transducer that radiates isotropically, that is, without giving
preference to one direction. The problem is that the counter electrode has a generally spherical
shape and this sphere is made of a conductive material that is perforated to transmit sound
waves, has a passage aligned with the electrode holder, and the discharge electrode has It is
solved by extending radially inside the spherical counter electrode and reaching a point near the
center of the sphere. In a preferred refinement of the invention, the counter electrode consists of
a fine metal grid. It can then be made up of two hemispheres connected to one another at the
height of the bisector by means of a counterelectrode holding device. The passage Fi is drilled at
one vertex of two hemispherical caps. The loudspeaker radiates isotropically over a large solid
angle range. The upper part can be easily exchanged since the counter electrode consists of two
parts. Protective coverings contribute to safety. A protective sheath and a counter electrode can
be provided, for example, between a protective sheath and the counter electrode, which performs
an emergency cut when electrically coupled by mechanical deformation of the protective sheath.
EndPage: 2 Another aspect of the present invention is the purpose of the dependent frame. The
invention will now be described in detail with reference to the drawings. The electric sound
transducer shown in FIG. 1 has a needle-like emitting tvt pole 1.
The radial 'kL' rIL pole 1 is disposed in the electrode holder 3 'with the exception of the point-like
point 2. The latter has a generally cylindrical shape and consists of a high dielectric constant heat
resistant material such as polytetrafluoroethylene. The discharge electrode 1 has a contact area 4
in the end area opposite to the point 2. The contact area projects rearward beyond the back of
the electrode holder 3. The discharge electrode 1 is surrounded by a spherical counter electrode
5. The counter electrode 5 consists of two hemispherical caps 5a and 5b connected to one
another at the height of the bisector by means of a holding device 6 configured as a ring. These
two hemispherical caps are preferably made of a fine-grained metal grid. In the case of the above,
the counter electrode 5-5 transmits the sound wave, but the opening is selected so as to form a
faraday box with respect to the electromagnetic wave transmitted from the discharge electrode 1.
In an alternative arrangement, the two half 4 "shaped caps 5a and 5b can consist of suitably
shaped sheet metal with a large number of small through holes. The hemispherical shell 5b is
provided with a passage 7 which is formed as a metal lead X-ray ring. The passage 7 is made of
copper or brass and is fitted to the wall of the pointed area of the hemispherical cap 5b. The
shell-like ring 7 forms a passage for the electrode holder 3. The discharge electrode 1 extends
radially into the interior of the spherical opposite pole 5 and is close to the center of the sphere
but reaches a point sufficiently far from the opposite electrode 5 to avoid arcing, The electrode
holder 3 is inserted. . For example, the electrode holder 3 is fixed in the shell-like ring 1 by a
fixing tool such as a screw. The area of the electrode holder 3 which is outside the spherical
counter electrode 5 is surrounded, for example, by a metal conductive sleeve 9 made of brass.
This sleeve 9 has a front area 9 at-approximately corresponding to the dimension of the axial
length / gua and in sliding contact with the inner surface of the ring 7. Preferably, it has a
smaller diameter than the remaining diameter of the rear area 9 b of the front area 9 afi of the
sleeve 9. For this purpose, a step is formed between the two zones 9a and 9b, and this step forms
a stop when inserting the electrode holder 3 into the interior of the counter electrode 5 = thus
the point 2 is spherical It is near the center of the counter electrode 5. In an alternative
arrangement, the sleeve 9 is secured to the ring 2 and can be made, for example, integrally and
by making an extension of this ring 1. In this case, the electrode holder 3 has substantially the
same shape as that shown in FIG. 1 and is inserted into the sleeve 9. In addition, a starting
electrode 10 is provided in the electric sound wave converter, and the starting electrode 1θ is
disposed inside f of the spherical counter electrode 5 and is electrically coupled to the counter
electrode 5.
Since the firing electrode 10 is far closer to the tip 2 than the counter electrode 5, the inclination
of the potential of the high frequency electric field between the tip 2 and the firing electrode 10
is greatly increased, and hence the firing of the corona discharge It will be easy. As shown in FIG.
1, the rising electrode 10 can comprise a metal grid cap 11. The apex of the cap 11 is fixed to the
inside apex of the hemispherical cap 5 a, and the concaved area of the seven points is directed
toward the tip 2 of the discharge electrode 1 and turned. In another embodiment shown in FIG. 2,
the ignition electrode 10 is a metal conducting ring 12 which is connected to the same metal
conducting ring 7 via a conducting metal retaining ring IJt-. Preferably, this ring 12 has a
diameter sb of about 30s at a distance of about 15 mm forward of the point 2. The sleeve 9 has a
shaft which engages in the socket 14 with some but small friction. The socket 14 is coupled to
the metal jacket 15. On the other hand, the metal jacket 15 seals a circuit (not shown) that
generates all the high frequency high voltage 1 g signals modulated by the low frequency signal
converted to the sound waves. The electrical circuit diagram of the above-mentioned highfrequency oscillator circuit is shown, for example, in the French patent publication 15c above. A
contact device 17 is provided in the interior of the jacket 15 in line with the opening of the
socket 14. This contact device is configured as a tongue in the illustrated embodiment and is
connected to the output of the EndPage: 3 oscillator described above, so that the counter
electrode 5 has one ring 71, one sleeve 9 and one socket 14 when receiving one. Although
grounded, the discharge electrode 1 is electrically connected to the output of the high-frequency
oscillator via the contact area 4 and the spring tongue 11f. In an alternative arrangement, the
sleeve 9 can be equipped with an external thread and the socket 14 with an internal thread, so
that the connection of the two parts is ensured. On the other hand-can also be provided with a
plug-in locking between the sleeve 9 and the socket 14. As shown in FIG. 3, the counter electrode
5 is completely surrounded by a large diameter spherical retaining envelope igyc-). Protective
jacket 18 is made of perforated material that transmits sound l #. This cover 18 consists, for
example, of two hemispherical caps z 8m and 18b joined by means of a retaining ring 9, 20, the
two hemispherical caps 18m and 18b being connected in half with a screw 21. A metal
conductive ring 22 is inserted into the wall of one hemispherical character fz 8 b. At the top one
point of the above-mentioned cap, the passage of three f 9 of the electrode holder 3 is formed.
The sleeve 9 is fixed to the ring 22 by means of the screw 23.
Preferably, the two hemispherical caps 18a and 18b are made of a metal grid. For this reason,
since the caps 18a and 11jb form a second box of 7 squares on the circumferential printing of
the spherical counter electrode 5, all external leakage of electromagnetic waves is avoided. In
addition, the protective cover 18 can prevent the counter electrode 5 from being touched by
hand. The reason is that it is generated by corona discharge at the tip 2 of the discharge
electrode, and heat is generated during use of the counter electrode 5 due to good heat. Two
hemispherical caps 18 a of the protective envelope 18. 11 j b is covered with a cloth 24. The
fabric 24 transmits sound, protects the electroacoustic transducer tube from dirt, and shields
light emitted by the corona discharge. In another embodiment of the present invention, the
sleeve 9 or the socket 14 can be surrounded by a reflector 25 as shown in phantom in FIG. Since
the surface of the reflector 25 follows the inverse exponential relationship, the sound wave
emitted downward in FIG. 1 is reflected in an appropriate direction. In an alternative
arrangement, the jacket 15 is coated with a plastic or rubber foam or other suitable sound
absorbing material. The examples shown here are merely for the convenience of the description
of the present invention and do not limit the present invention in any way. Within the scope of
the invention, numerous embodiments can be given without departing from the scope of the
4. Brief description of the drawings. FIG. 1 is a cross-sectional view of the electroacoustic
transducer, FIG. 2 is a sectional view corresponding to FIG. 1, and FIG. 3 is equivalent to FIG.
However, it shows a side 1Tii view in a partial cross-sectional view of an electroacoustic
transducer with a protective envelope. DESCRIPTION OF SYMBOLS 1: .. It's ith pole, 3 ... electrode
holder, 5 ... counter electrode, 6 ... holding apparatus, 7 ...-passage, 9 ... sleeve, 10 ... ignition
electrode, 14 ············· Socket, customer agent attorney Takehiko Sae 3 EndPage: 4