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JPS5354015

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5354015
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a drawing showing a vertical cross section
including the center line of the electrokinetic transducer according to the present invention, FIG.
2, FIG. 3, FIG. 4, FIG. 1, a bottom view of the diaphragm of the one shown in FIG. 1, a vertical
sectional view of the diaphragm, a bottom view of the one shown in FIG. 1, FIG. 6 is another
example of the electrokinetic converter according to the present invention 1 is a view similar to
FIG. 1, FIG. 7 is a bottom view of the diaphragm of the one shown in FIG. 6, and FIG. 8 is a
vertical sectional view illustrating the case where the electrodynamic converter according to the
present invention is configured as an internal magnet type. I will 1 ······ Permanent magnet, 2, 3 · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · cone of the diaphragm, 6 · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · Flange portion of the diaphragm, 7 · · · · · · · · arc portion between the conical portion of
the diaphragm and the flange portion, ----- ring (use diaphragm mounting), 10 ', 11 flange portion
of ...... yoke, cone of 12.13 ...... yoke, 14 ...... Sound emission hole, 15 ················· Connection part of
the conductive part that reverses the winding direction.
DETAILED DESCRIPTION OF THE INVENTION An electrokinetic converter of the type that drives
the entire surface of a diaphragm was proposed by Brathara in the old days and was called a
Pratthara speaker. This is not a drawback of the conventional type in which the diaphragm is
vibrated by a pinching coil (a defect in which a divided vibration is caused in the diaphragm
because the driving force is at the central portion). In recent years, as a modification of Brathara
speakers, aluminum deposition of a ring pattern on a polymer film of several microns to several
tens of microns has come to be used as a drive unit (electro-kinetic converter) in Hendhorn. The
magnetic circuit for the ring pattern of is complicated and scarce in mass production, and is
forced to be expensive. The object of the present invention is to provide a full drive electrokinetic
converter in which the above points are improved. The following is a description of the present
invention with reference to the drawings. FIG. 1 is a view showing an example of the
electrokinetic converter according to the present invention, which is a type (external magnet
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type) in which a ring-shaped permanent magnet (1) is on the outside. +2) +31 is a yoke, (4) is a
diaphragm. The shape of the yoke (2) viewed from above and the shape of the yoke (3) viewed
from below are shown in the plan view of Fig. 2 and the bottom view of Fig. 5, and the shape of
the diaphragm (4) is different. It is shown in FIGS. 3 and 4. (2) FIG. 6 is a bottom view of the
diaphragm (4), and FIG. 4 is a vertical sectional view of the diaphragm (4). The diaphragm (4) is
formed by vacuum forming a synthetic resin film to form a conical portion (5), a flange portion
(6) and an arc portion (7) therebetween as shown in FIG. A conductor (8) is provided which
spirals around a conical surface as shown in FIG. 6 by vacuum evaporation or the like, and the
flange (6) is permanent magnet through a ring (9) (see FIG. 1) Attached to (1) and yoke (2). On
the other hand, the yoke + 21 + 31 comprises a flange portion αoa ++ holding a permanent
magnet (1) and a conical portion t 12 ilm having the same conical angle as the conical portion (5)
of the diaphragm (4), and the conical portion of the diaphragm (4) (5) is arranged concentrically
so as to keep equal intervals with respect to the conical portion 0αJ of the yoke + 21 + 31. The
magnetic lines of force of the magnetic circuit including the permanent magnet (1) and the yoke
t2 ++ 31 are normal directions of the conical surface of the conical portion 113131, and thus the
fourth portion N-in the conical portion (5) of the diaphragm (4). It is N direction. When a current
flows in the conductive portion (8) spirally provided on the diaphragm (4) around the conical
surface, a force in the N-N direction acts on the wire element of the conductive portion (8), (3)
Drive the entire surface of the diaphragm (4).
The resultant of the driving forces in the N-N direction is directed towards the center line of the
conical surface of the conical section (5). The sound generated by the vibration of the diaphragm
(4) comes out from a number of sound emission holes ll4) provided in the yoke (2). In the
embodiment shown in FIGS. 6 and 7, the diaphragm and the yoke have two conical portions in
terms of size, in which the conductive portion on the diaphragm (4) is provided. (8) is composed
of two parts (8a) and (8b) opposite in winding direction, and they are connected in a loop at a
portion t151. FIG. 8 shows the case where the present invention is configured as an internal
magnet type, and the yaw (3) has two parts, one of which is a conical portion U31, and the
present invention has been described in zero or more The electro-kinetic converter according to
the invention is of the full drive type under a simple configuration. Further, since the vibrating
portion of the diaphragm of this type is conical, it is not necessary to be tensioned and held from
the side of the peripheral portion as in the case of flat film. (4), late
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