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Public enterprises, 14. Delivery: August 30n, 1st, 1st Director General, Hideto Saito 1, Name of
Invention: Electrokinetic electroacoustic transducer Name (name) (Name) (422) Nippon
Telegraph and Telephone Public Corporation Keisuke Yonezawa (Country 1) \ 1 ) Chofu Kohlorus
Room No. 11 i Story Chofu (0424) 83-1221 [Phase] Japan Patent Office 0 Published Nissho 51.
(1976) 3.4 ? Japanese Patent Application Shogo-? q35G + 6555 Akira, narrow book ? title of
the invention ? title of the invention electrokinetic electroacoustic transducer
0 JP-A-51-26523
3. Detailed Description of the Invention The present invention relates to the construction of a
highly reliable, simple-to-structure four-kinetic electric reverberator. The principle of operation
of the electrodynamic electroacoustic transducer is that when current flows in a magnetic field, a
force acts in the direction perpendicular to the plane where the magnetic field and current are
determined. The generated force is often used from the point where the current and the magnetic
field cross at the maximum. As shown in FIG. 1, the structure of the electrokinetic converter is
such that the bobbin with the moving coil (2) attached to the diaphragm (1) is adhered, the
magnet (6) is the inner pole, and the high permeability material (7) The moving coil (2) is placed
in the magnetic gap with the outer electrode as the outer pole, and the diaphragm is moved by
passing alternating current to the input electric terminals (3) and (4). The biggest drawback of
this method is the bobbin, the dynamic coil. The parallelism between the inner and outer poles
must be sufficient, and the overall configuration, including the clamp ring of the diaphragm
supporting the bobbin, the spacer, etc., must satisfy the above requirements. It is in. The present
invention is intended to provide an electrodynamic electrical-sound-graphics converter which is
simple in structure and requires less machining accuracy in order to eliminate these drawbacks.
The drawings will be described in detail below. FIG. 2 shows an embodiment of the present
invention, in which (1) is a diaphragm made of an insulator, and (2) is a moving coil deposited on
the diaphragm. This dynamic coil is deposited on the diaphragm so as to be linear as shown in
FIG. The moving coils are provided on both sides of the diaphragm, and both are connected at the
center of the diaphragm (1), and the moving coil (2) is wound in the opposite direction on the
front and back of the diaphragm (1). Such diaphragms can also be provided in multiple layers
with spacers interposed therebetween. (3), (41 is an input electrical terminal, EndPage: 1) Both
are taken out through a spacer (5) which is 51 teed metal electrodes. As shown in FIG. 3, (6) is
radially magnetized and is a hollow cylindrical magnet. (7) is a 4'll plate which doubles as a
magnetic circuit. (8) is an upper plate which also functions as a sound transmission port, and the
diaphragm can be braked by the sound transmission port (this is made of a nonmagnetic
material). (9) is a bottom plate with an electrode extraction hole, which is made of a nonmagnetic
material. Although only a disk is shown as the sliding plate, the moving coil is deposited only on
the periphery of the old plate, so a dome-shaped or cone-shaped center can also be used.
Referring now to the operation of this, the magnetic field produced by the two hollow cylindrical
magnets is as shown in FIG. Here, since the side plate (7) is made of a magnetic material, and the
upper plate (8) and the bottom plate (9) are made of a nonmagnetic material, the magnetic gap
with the diaphragm is smaller in magnetic resistance and larger. Get a lot of magnetic flux.
Further, in the magnetic gap, the magnetic flux becomes parallel to the diaphragm surface in the
radial direction of the diaphragm. Here, when current is supplied to a moving coil deposited in
the circumferential direction of the diaphragm, vibration of the diaphragm in a direction
perpendicular to both the current and the magnetic field, that is, perpendicular to the surface of
the diaphragm is obtained. As described above, the number of parts is small, the assembly is
easy, and there are few places requiring precision in manufacturing, and it is possible to obtain
an electrodynamic type electric console converter suitable for mass production and having high
reliability. In the above embodiment, a magnet and a spacer. Although the example which
arranged the unit which consists of a diaphragm, a spacer, and a magnet in one layer was
explained, the unit can be arranged in multiple layers. As explained above, manufacture is easy
and structure is simple with a few basic parts that do not require much machining accuracy. In
addition, since a highly reliable electrodynamic electroacoustic transducer is obtained, it is
effective for use as a small speaker for a portable device, a small microphone, and a transmitter /
receiver for a telephone.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view of a conventional
electrokinetic transducer, FIG. 2 is a cross-sectional view of one embodiment of the device of the
present invention, and FIG. 3 is a perspective view of a cross section of the magnet shown in FIG.
The figure shows the magnetization direction of the magnet and the direction of the magnetic
field. Fig. 4 is a perspective view of the diaphragm (1) и и и diaphragm, (2) и и и и dynamic coil% (3) +
(4 + и и и и и и и и и electrodes ( 5) иии Spacer, (6) иии и и и Magnet, (7) и и и Side plate, (8) и и и Upper plate, (9)
и и и Bottom plate patent applicant (5) No. 1 wJEndPage: 2 Fig. 2 b 2 Fig. 4 6 Inventor address
other than the above address No. 3 9-11, Midoricho, Musashino City, Tokyo Nippon Telegraph
and Telephone Public Corp. Hirohiro EndPage: ?
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