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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are sectional views of a conventional
electroacoustic transducer, FIG. 3 is an exploded perspective view of the electroacoustic
transducer of the present invention, and FIG. 4 is a plan view of the same transducer. Fig. 5 is a
cross-sectional view of the converter taken along the line AA 'of Fig. 4. Fig. 6 is a cross-sectional
view of the converter taken along the line BB' of Fig. 4. The figure is a cross-sectional view of
another embodiment of the present invention. 1, 1 '· · · · · · · · · Magnetic back plate, 2, 2 · · · · · ·
sound through holes, 3, 3 · · · · · magnets, 4, 4' · · · · · · · sound transmission Hole, 5 ... WP ... ...
Elastic body. Fig. 1 Fig. 2 I 一 1- 71- 開 50 50-102332 (2) 2− 3-72-− 5 · 0- 102332 (3) Fig. 5
Fig. 6 7 7 '423 //// j3, t'2 '76310 q /' J4-2 /// jd J '4'2' 76 y q. ? ly 473 '// lj, 2 ≠ ·, 乙 J-73-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electroacoustic
transducer, in which mK consists of a film-like diaphragm having a coil printed face-up and a
magnetic circuit orthogonal to this coil, to which voice power is transmitted. The present
invention relates to an electroacoustic transducer of a type in which the film-like diaphragm is
driven by the addition. As a conventional flat drive dynamic quantity electroacoustic transducer
that is known to have flIO and a diaphragm support mechanism as shown in FIG. 2, the
transducer shown in FIG. In order to have compliance, the gap between the magnetic pole and
the diaphragm with the coil must be increased, and the efficiency of the sound reproduction is
low. In the figure, υ indicates a magnetic back plate, @ indicates a magnet, and 財 is a diaphragm
support frame. In the case of a converter having a flat imaging plate fixed to the periphery as
shown in FIG. 2, the distance between the magnetic pole and the imaging plate is reduced and
the writing of the magnetic flux is increased. However, since the output sound pressure changes
and distortion increases due to the elongation of the diaphragm due to the inflection time-lapse
change, the diaphragm (s) is formed of a thick film that is relatively difficult to stretch, so As the
stiffness is high, the weight of the diaphragm itself increases. On the other hand, it has the
disadvantages of deteriorating the sound reproduction efficiency and deteriorating the
reproduction of the wide band. In the drawing, C3 is a magnetic back plate, (2) is a magnet, and
(d) is a diaphragm support frame. It is an object of the present invention to provide an
electroacoustic transducer which eliminates the above-mentioned drawbacks of the conventional
product and applies a constant tension to the diaphragm 41 to correct the elongation of the
diaphragm with time. (2) Next, the electro-acoustic transducer of the present invention will be
described with reference to FIG. 1jiK. Figure 3 through :! ? In FIG. 6, +11, (11 is a disk-shaped
magnetic back plate made of soft potato or the like, and a plurality of acoustic through holes t21,
+21 are made parallel to each other. (3)。 (3 ') is a disk-shaped magnet, which is multipolarmagnetized and extends in a direction perpendicular to the acoustic holes t21, t2'l of the
magnetic back plates t1), (1') Holes +41 and +41 are drilled. (5) is a ring-shaped frame to which
the magnetic back plate (1), (1) is attached, and (D) is a diaphragm, and the diaphragm body of
plastic film (6 ') is a good electrical conductivity of steel etc. facing up. A flat coil (7) is formed by
printing a metal, and the peripheral edge of the vibration plate (5) is attached to a ring-shaped
frame (8) K. (9) is a projection frame having a ring-shaped flange 01, and the diaphragm (6) is
mounted, and the ring-shaped flange (10 is provided so as to abut on the peripheral portion of
the diaphragm * plate 6) It is done.
An elastic ring-shaped elastic body 4111 is formed of a material such as foam rubber, and in the
embodiment, is disposed between the upper magnetic back plate (11 and the ring-shaped frame
(8) 9, The frame (8) is pressed from the upper side, and tension with a suitable value of
electrokinetic force L7 is applied to the diaphragm (6) with the ring-like protrusion (3) edge t1ω
of the protrusion frame (9) as a fulcrum. The elastic body t1 may be a single sheet or a plurality
of sheets may be laminated as shown in FIG. 5 and the fan 6 and the diaphragm (6) K can be
obtained by changing the elastic force of the elastic sheet. This tension is prolonged by changing
it arbitrarily. Although the off view shows another embodiment of the present invention, in this
embodiment, the outer diameter dimension of the moving plate main body (6) having the planar
coil (7) is a projection frame (diaphragm). 9) Ring-shaped flange 11 (provided to be smaller than
the inner diameter of I, and two relatively thin film-like controls so as to hold the diaphragm rest
(6) on both a of the diaphragm main body (6) A diaphragm 0 ° is disposed. Also, in this case, the
peripheral edge of the regular diaphragm (K, as) is attached to the ring-shaped frame (8). The
other structure is the same as the embodiment shown in FIG. Therefore, the diaphragm body (6)
having the above-mentioned configuration (accordingly, the planar coil (7) in the face direction)
is simply controlled by the tension of the diaphragms a3 and Q3 supported by the ring-shaped
flanges. Since the sheet is held between the two sub-sliding plates (4), it is possible to prevent the
voice coil from being adversely affected by the expansion of the diaphragm main body (6).
Therefore, in the present invention, since a constant tension having a suitable value can be
applied with the diaphragm (8) K and the projecting edge Q1m as a fulcrum, the elongation
percentage is relatively increased without increasing the distance between the magnetic pole and
the diaphragm. It is possible to form the diaphragm with a large, thin and light film. According to
the electro-acoustic transducer of the present invention as described above, it is possible to
achieve high fidelity and high-efficiency sound reproduction in a wide band.
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