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1. Name of the Invention Sound Transducer Address (Location) Meguro 1-Chome, Meguro-ku,
Tokyo 1- 4 Name (Name) (SO +) Pioneer Corporation Representative Yoshihiro Ishizuka Name
(6069) Patents Hideo Nobuo [phase] Japanese Patent Office ? Japanese Patent Application LaidOpen No. 51-1.2132i0 Japanese Patent Application No. 51. (1976) 10.23 Local Serial Number
Specification 1, Title of Invention 1, Title of Invention Acoustic Transducer
?? Patent applicant
Detailed Description of the Invention The present invention relates to the improvement of a full
drive acoustic transducer. As shown in FIG. 1, a conventional full-drive acoustic transducer is
supported by a magnet by means of a flat vibration @f 21 t-s spacing member (31 и (3 ') with a
Heus coil (1) printed on the back surface. In the plate (4) (in which the magnet support plate (4)
(4 ') is interposed between four magnets (51. And so that the same pole is opposed to the voice
coil (1) and the sound wave radiation yc (4a) (4'a) is pierced. The voice current flows in the
direction of the arrow (a) or (in the edge direction to the voice coil (1), and the magnetic flux
from N billion of the magnet (5) to the magnet (61 of S etc.) Therefore, according to the law of
Fleming's left hand, the diaphragm (21 moves in the direction of arrow (0), (C ') direction 1 & i
which is perpendicular to the plane), and the sound changes depending on the sound current by
the vibration It will be emitted from the holes (4a) и и (4'a). However, this conventional acoustic
converter IS requires a plurality of EndPage: 1 magnets immediately, and from the arrangement
of the magnets, the internal bond of the sound temporary radiation person is i! IQ @@ has a
disadvantage that acoustical loading occurs in the gap and disturbance occurs in the number
characteristic. Therefore, the present invention pays attention to such a point, and the magnetic
flux supply is performed by the yoke extended from the poles of the magnet to improve the f ?
efficiency and no sound load is generated in the front and the rear of the diaphragm. It is an
attempt to provide a full-text drive type noble-copy converter. Hereinafter, an embodiment will
be described with reference to FIG. (7) is a magnet made of ferrite, alnico, etc. A yoke (81 и (9)
made of a soft magnetic material extends from the two poles of the magnet and the side of the
space ?2 and its tip is arranged in the shape of (2) The ball-shaped portions (8a) and (9a) to be
the m-pole are arranged to be formed, and gaps are formed at ten places. a ? is a diaphragm of a
strong <RTIgt; Glasstec </ RTI> sheet or the like, and voice coil aD is printed in a rectangular
shape on one side of the diaphragm, and the voice coil (the long hill (ill) of the ill The length of
the gap formed by the ball-shaped portions (8a) and (9a) of (8,... (9) is slightly longer, and the
distance between the mounting portions (lla) is equal to the distance between the gaps. Then, in
the space LI of the ball-like portion (8a), (9a) 5 of the peristaltic plate lime yoke f8 + и f91 on
which the voice coil aD is printed, the voice coil t111 (D holder (lla) is It arranges so that it may
be located near the gap between the ball-like parts (8a) and (9a), and the peripheral end part is
from the demarcation that defines the magnet (magnetic flux d1 from the 71 ON pole d1 yoke
(8), yoke (8) Of the magnet (7) via the ball (8a), the gap, the yoke (the ball (9a) of 91), and the
yoke (9).
Therefore, when the voice coil 11K voice current flows, part of the magnetic flux generated in the
gaps of the ball-shaped portions (8a) and (9a) I crosses in the direction perpendicular to the voice
current, so There are ilr and d forces according to the Fleming Applanation Law. This
electromagnetic force is generated in the direction perpendicular to the surface of the diaphragm
nu, so that the diaphragm a? is fully photographed according to the sound t [r, and the sound
wave can be emitted. In the above, the shapes of the yokes (8), (910 ball-shaped portions (8a),
(9a) may be round or plate other than square, and in the case of plate, they also serve as a
diffuser. You can also do so. In addition, it is a matter of course that the shooting plate '?? can
also be positioned at the front of the ball-shaped part (8a), (9a), and it can be used for more than
O. According to the present invention, yokes are extended from both poles of the magnet, and a
plurality of gaps are formed by the yokes, and a diaphragm is disposed so that the voice coil is
positioned near the gaps. Therefore, it is not necessary to use magnets that are small and highperformance as in the past because magnets are stagnant at one base and their positions are not
limited, and magnets that provide necessary magnetic force are freely selected at low cost. . The
efficiency of conversion can be increased, and the shape of the yoke gap can be a plate with little
air resistance. Furthermore, the shape of the magnetic circuit EndPage: 2 can be arbitrary, and
therefore the peristalsis. It is possible to prevent the generation of harmful acoustic load on the
plate, greatly improve the circumstantial mantissa characteristic, and to fully eject the
advantages of the entire drive system from the above.
4. Brief description of the drawings FIG. 1 shows a conventional acoustic transducer, (a) q a back
view of a retracting plate, (a) a longitudinal sectional view of the transducer, and FIG. 2 an
embodiment of the present invention (B) is a perspective view of the acoustic transducer, (b) is a
back view of the diaphragm, inside is a cut m1 showing the positional relationship between the
pole-like portion of the yoke and the peristaltic pin o (7)
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Inventors or patent
applicants other than the above Address Name Address Name Name (2) Patent applicant address
(location) name (name) representative address (location) name (name) representative EndPage:?
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