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JPS49124036

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DESCRIPTION JPS49124036
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional
electromagnetic converter, FIG. 2 is a sectional view showing an embodiment of the
electromagnetic converter of the present invention, and FIG. 3 is a diaphragm used for the
converter. 4 is an exploded perspective view of the main part, FIG. 5 is a cross-sectional view at
the time of assembly, and FIG. 6 is a main part perspective view of the same. 11 и и и outer case,
13 и и и terminal plate, 14 и и и inner case, 15 и и и 5 5 ball, 16 и и и plate, 17 и и и Mag, net, 19 и и и coil,
23 иии Diaphragm, 24 иии Vibrating piece. Fig. 1 Fig. 2-79-Japanese Utility Model Application
Publication No. 49-124036 (2) Fig. 3 = Japanese Utility Model Application No. 49-124036 (3)-81
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stable pressurerepetitive stable electric-to-digital converter which does not increase the frequency band at small
scale. A conventional electromagnetic transducer of this kind is configured as shown in FIG. That
is, the terminal plate 2 is disposed at the bottom of the case 1 made of aluminum or yellow, etc.,
and one plate 4 provided with the center pole 3 is placed thereon. And the fK carp A6 and the
diaphragm 8 to which the moving piece ? is attached also at the center portion with a fixed gap.
ing. The vibrating reed 7 and the vibrating plate are made of a ferromagnetic material. In
addition, an elastic material having a tensile force, such as iron to nick A alloy, is used as the
moving plate 8 # 'i tensile strength. Further, the old edge portion of the diaphragm 1 is
supported by the step 10 of the inner case 9 which is made of a non-dough material system, and
maintains a constant gap with the center port A3, the coil 6, the magne, and the grate 5. The
vibrating plate T1 vibrating plate 8 is vibrated by the alternating current magnetic field
generated by the alternating current applied to the coil 6 from the outside at all times by the
direct current magnetic field of the vibrating plate 8ti magnet 6 and the vibrating plate T1
vibrating plate 8 is vibrated. Thus, in a pigeon house using a rigid plate as a diaphragm, the
fundamental resonance 8 wave number is 4 as seen by the following equation. f и и = KT7 Tsuwata
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mechanism 3 Note that 0.467 The constant k only 'IRE fixation Subcommittee constant when the
peripheral free diaphragm 0.412, t diaphragm thickness, a is the radius, E is Young niece, po is a
diaphragm! ! Degree, one company Poisson's ratio. Thus, using a material-foot, constantthickness material decreases the radius & 2 in inverse proportion to JIt decreases the # 1
fundamental resonant frequency and increases the fundamental resonance frequency, and wants
to use it with a sound range of 1 KH to 3 KHIl. The converter can not be miniaturized. That is, in
the case of iron-Ninokel alloy &, when the thin sheet is the thinnest in the pile, if the toya plate
and this alloy plate are used as the diaphragm, miniaturization as described above is difficult. The
small size in the low frequency band can not be obtained. The present invention is intended to
eliminate the above-mentioned conventional drawbacks. The present invention will be described
below with reference to the drawings of an embodiment of the present invention. Reference
numeral 11 denotes an outer case made of nonmagnetic material such as aluminum, brass or
synthetic resin, and a terminal plate 13 having a 12 tl terminal is attached to the bottom of the
outer case 9; An inner case 14 which is made of an inner cylindrical surface Ka synthetic grease
or the like of the sleeve 11 is disposed.
A plate 16 integrally provided with a center board A15 is disposed on the terminal board 13, and
a ring-shaped magnet 17 is disposed on the plate 16 between the magnetor 1 and the center port
A115. A carp A19 wound around a bobbin 18 is placed in the gap. The upper end of the magnet
17 is locked at the upper end of the inner case 14. Furthermore, a concave 20 is formed on the
upper surface of the inner case 14, and a pottererene terephthalate resin film is formed by the
concave 2o and the pressing ring 22 having a convex 21 that fits to the concave 2o in the lower
surface. And the like, and a plain portion of the diaphragm 23 made of a synthetic resin film
having a low specific gravity is held. As shown in FIG. 3, a vibrating reed 24 made of a soft
ferromagnetic material is attached to the central portion of the vibrating plate 23 with an
adhesive or the like. In addition, the upper grip ring 22 on the Ka ring shaped ring, page? 26 are
arranged and pressed 6--pressure at the upper end of the guard case 11. As shown in FIG. 4, the
outer case 11 is arranged in the opposite direction, and the spencer 25 and the ring 22 are
housed in the outer case 11 to assemble the t6 transducer by means of weaving like a grain. And
the inner case 14 assembled, the grate 16 with magnet 17 and carp 219 attached, and the
terminal f13 housed, and the lower end of the outer case 11 is bent with a brace 26 as shown in
FIG. Do. Of course, the lead 2 end of the carp h19 and the terminal 12 of the terminal board 13
are connected in advance. When assembled as in the case of K, according to K, the flange portion
of the diaphragm 2a is held between the ridges 21 of the pressing ring 22 and the grooves 2o of
the inner couss 14, and is fixed 3 with an appropriate tension. . As described above, a synthetic
resin film is used as a diaphragm, and a large one has a basic resonance frequency K represented
by the following equation. ,. , =! 2-IjL2A-out. {Circle over (6)} Note that the elasticity of the T4
diaphragm, m is the radius of the surface density ad pushing Ith plate of the diaphragm. From
this equation, the basic co-imaging same wave number increases in inverse proportion to the
radius aK, but the diameter of the diaphragm can be reduced by selecting the tension T to an
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appropriate value. However, even if the nose is turned, the use range can be reduced to 1 to 3 Kn
?. Furthermore, the sound pressure of the diaphragm of the alloy plate film and the diaphragm
of the synthetic synthetic grease film, which is inversely proportional to the mass of the round
diaphragm, is also strikingly advantageous. As described above, since the electric S converter of
the present invention uses a synthetic resin film as a diaphragm, it has a small mass and its
tension can be freely adjusted by the surrounding holding mechanism. , Sound pressure
characteristics are also stable, it is a large turtle of practical threshold value.
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