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ATONOB Name Nobuhisa Shinchi · (t't 3 people) 3 Patent applicant address Osaka Prefecture
Kadoma city Oza Kadoshin Address 1002 Name (582) Matsushita Electric Industrial Co., Ltd.
Representative Masaharu Matsushita 4 agent 〒 57'1 ■ Japanese Patent Agency ■ Request for
examination of JP 52-4228 (all four pages)
Omnidirectional electrokinetic electroacoustic transducer
3. Detailed Description of the Invention The present invention provides a simple non-directional
forward electric electro-acoustic transducer having a simple structure and conversion efficiency.
In order to realize a conventional omnidirectional speaker, it is possible to use a plurality of
electrodynamic loudspeakers in an arc or a circle, or to use an electrostatic loudspeaker that can
make the diaphragm cylindrical, or a piezoelectric high loudspeaker. It was limited to molecular
film speakers. When it is realized by using a plurality of electrodynamic speakers, the size and
cost of the system as a whole are unreasonable, and the non-directionality in the horizontal
plane-the collection system of the speaker system is remarkable. FIG. 1 is a conventional example
for realizing an omnidirectional speaker in a horizontal plane by an electrodynamic speaker. In
FIG. 1, 1 is a cylindrical plastic base film, and a conductor portion 2 is formed on the film 1 by
printing. Reference numeral 3 denotes a hollow cylindrical ferrite magnet, and an annular
cylindrical plastic base film 1 is disposed around the outer periphery of the ferrite magnet 3. The
conductor 2 on the base film 1 forms an axially parallel extension along the generating line of
the cylinder, and the flow direction of the signal current is such that adjacent layers are opposite
to each other as shown in the figure. In addition, the occupation structure of the ferrite magnet 3
is arranged with alternating polarity along the circle surrounding the hollow cylinder 3. The
drawback of this structure is that the conversion efficiency is low due to the poor utilization
efficiency of the magnetic fluxes which are required to multipolarize the magnet, N1 ', C1 and the
conductor 2 orthogonal to the conductor 2 in the plane. Although there are the above-mentioned
electrostatic type and piezoelectric type speakers as other non-directional speaker structures,
they have not been widely used because they have a poor impedance matching with a generalpurpose audio amplifier and EndPage: 1. In particular, electrostatic and polymer piezoelectric
types can realize a cylindrical shape very easily and can obtain an omnidirectional speaker in a
horizontal plane, but their own impedance is high, and a voltage drive system is used. It will be
necessary. Furthermore, the voltage sensitivity is essentially low. As described above, the
conventional nondirectional (at least in the horizontal plane) speaker can not be easily obtained.
Also, until now, the cylindrical speaker in this case needs to increase the area of vibration and
vibration from the problem of sensitivity to sound pressure, so it becomes an elongated circle
and a tube. As a result, the directivity in the vertical direction (vertical direction) is reduced. All of
the conventional electrostatic type, piezoelectric type, or the speaker shown in FIG. 1 have to be
sacrificed for this vertical directivity. Here, if we list conventional and intermittent points, the (+)
electrodynamic speaker unit is arranged in an arc or circumferential shape 4 'is complicated in
structure, and the cost is increased because a plurality of speakers are used. It becomes a factor.
(B) It is difficult to realize the circular pressure structure such as electrostatic type or polymer
piezoelectric type easily because the sound pressure sensitivity of the SVY itself is low or it is
difficult to simultaneously satisfy the directivity of the in-bi direction of the men's direction . The
present invention is &! The present invention provides an omnidirectional electrodynamic
electroacoustic transducer that can solve all M problems, and the present invention will be
described in the following. An embodiment will be described with reference to FIG. 2 to FIG. First,
the entire configuration will be described with reference to FIG. 2 and FIG. In FIG. 2 and FIG. 3, 4
and 4 'are disk-like yoke plates, and 15 and 5' are cylindrical magnets provided at the center of
the yoke plate 4.4 ', 6 °. 6 'is a cylindrical yoke provided on the outer peripheral portion of the
yoke plate 4, 4', 7j 7 'is a center ball attached to one side of the magnet 6) 6', and the center ball
7.7 ' A plate 8 having an H-shaped cross section is held on the side. Two magnetic circuits are
constituted by the yoke plates 4 and 4 ', the magnet 6.6', the cylindrical yoke 6.6 ', the center ball
7.1, and the plate 8, and the cylindrical' magnetic air gap of each magnetic @. 9. A cylindrical
vibrator 10 is disposed at σ. The end of the vibrating body 1o is fixed to the cylindrical yoke 6.6
'by the tightening ring 11, 11' and aged. Further, the central portion of the vibrating body 10 is
fixed to the outer peripheral surface of the plate 8 having an H-shaped cross section by the
tightening ring 12. As shown in FIG. 2, since the magnets 5 and 8 'are disposed opposite to each
other, the polarities of the magnetic spaces @e and w of the two magnetic circuits are opposite to
each other. Next, the details of the vibrating body 10 will be described with reference to FIGS. 4
and 6. FIG. The 14th ridge is a developed view of the cylindrical vibrating body 1o, and a
rectangular spiral conductive carp M4 ° is formed on one rectangular ultrathin polymer film
(polyester, aromatic polyimide shout) 13 It is done. The rectangular spiral shaped conductor coil
14 can be formed by photo-etching, tumbling after aluminum deposition on the polymer film 13.
Alternatively, the conductor foil may be adhered onto the polymer film 1'3 and then
photoetching may be performed, or the conductor coil 14 may be formed by metal printing. The
E and lower end portions of the vibrating body 10 formed as described above are respectively
fixed to the cylindrical yoke 66 ', and the central rectangular portion (dotted line portion in FIG.
4) of the vibrating body 10J1.sigma. It fixes to the outer peripheral surface of 8. In the vibrating
body of FIG. 3, the portion which effectively contributes to the vibration is a region in the
longitudinal direction of the conductor portion.
The rectangular spiral conductor coil 14 has a conductor line width and between conductor lines.
The thickness of the conductor can be arbitrarily designed, and as a result, the electrical
resistance of the conductor is as simple as 7 when the desired value (several ohms to several tens
of ohms) is obtained. In the case where the film 13 is polyester or the like, it is also possible to
attach the stitches 15 and 15 ', and the effect on sound saving is large. In FIG. 3, 16 ° 16 'is an
input signal terminal. From this, it will be aggravated to take out the lead wire by an appropriate
means. FIG. 4 is a rear view of FIG. In this figure, when the signal current path is clarified, the coil
a passes from the input terminal 16 'to the circumference of the cylinder 9 and passes to b,
passes through b, and the coil passes through C twice at right angles. Furthermore, one turn on
the circumference leads to d. Here, the direction in which the signal current flows is EndPage: 2
in the reverse direction in the coils of a and d or b and a. Therefore, since the magnetic air gaps 9
in which a and b exist and the magnetic air gaps σ in which C and d exist have opposite
polarities to each other, the respective magnetic air gaps fi9. The current and the magnetic field
are orthogonal to each other on the generatrix of the cylinder so that the vibration of the
vibration body arranged at σ has the same phase. As described above, at the moment when the
signal current is formed, it becomes a route path from the input terminal 16 'to the coil a to b to
O to d to i to q to h-----. In the above embodiment, the inner s-shaped magnetic circuit can be
configured or can be realized by the outer magnetic type magnetic circuit. The conductor coil
may be provided on only one side of the film 13 or on both sides. The present invention is
configured as described above, and according to the present invention, the following effects can
be obtained. (1) The effective utilization of magnetic flux is extremely high compared to the
conventional cylindrical shape in FIG. 1, and the current flowing through the conductor coil on
the film and the magnetic flux in the magnetic gap always cross at right angles on the generatrix
of the cylinder. Transform * pIE greatly contributes to increase. (II) When the effective width
(portion contributing to vibration) of the vibrator is 5 μm each, it is sufficient for the film to
have a diameter of 6 o-and in the case of a cylindrical shape, aromatic polyimide y, s. Using a ttm
thickness and a conductor resistance of 8Ω, the vibrating membrane effective mass is as light as
about 204, the electro-acoustic conversion capability is extremely high, and it is possible to
realize the high-range reproduction band reproduction. (2) The directivity of the vertical
direction is also extremely good because the effective widths of the vibrators are about 61 each.
The diaphragm can be formed into a cylindrical button without interrupting the conductor
pattern on the vibrator and the manufacture is simple. (■ A conventional cylindrical cast magnet
can be used to reduce the cost. Since the entire surface is uniformly driven, a flat frequency
characteristic can be obtained.
4. Brief description of the drawings. FIG. 1 is a partially broken front view of a conventional
nondirectional electrodynamic speaker, FIG. 2 is a perspective view of one embodiment of the
present invention, and FIG. 3 is FIG. FIG. 4 is a development view of the vibrator applied to the
converter in an embodiment of the present invention, and FIG. 6 is a rear view of the main part of
the converter in FIG. 4.4 '· · · · · · · · · · yoke plate, 5, 5 · · · · · · · · · · · · · · · · · · · · · · · · · · cylindrical
yoke, "7, 7" · · · · · · center Pole, 8 ··········· 9, 9 ′ ········· Magnetic gap, 1 ········ Vibrator, 11.11 ′
···················· 12 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Lead and coil. Name of agent Attorney
Nakao Toshio Nakano has 1 person @ 1 EndPage: 3 Fig. 2 Fig. 4 Fig. 1 Fig. 1 Fig. 5 @ 6 Inventors
and agents other than the above (1) Inventor name Name Large 6 ′ ′ ′ ′ O Masaharu
Sumi ・ Place (2) Agent: '= 2 EndPage: 4