JPS56152398

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DESCRIPTION JPS56152398
Description 1, the title of the invention
Electromagnetic transformer
3. Detailed Description of the Invention The present invention relates to rsffM and a magnetic
transducer for the purpose of improving the magnetic characteristics, reducing the number of
parts and improving the productivity. Conventionally, an electromagnetic transformer used in a
telephone or the like generally has a configuration as shown in FIG. 1 (a) is a top view, FIG. 1 (b)
is a bottom view, and FIG. 1 (c) is a cross-sectional view taken along the line A-B-C-0-D of FIG. 1
(b). . In these figures, 1 is a cover, 2 is a diaphragm, 3 is an armature, 4 is an inner bottom plate,
5 is an outer pole, 6 is an inner pole, 7 is a coil, 8 is a magnet, 9.9 'is a terminal, 10 Are slits, 11
are projections, 12 are apertures, 13 is a magnetic gap, 14 is a frame, and 15 is a back cover.
Next, the outline of the operation will be described. An armature 3 made of a magnetic material is
attached to the central portion of the diaphragm 2 and a magnetic circuit (inner pole bottom
plate 4 ° outer pole 5. Inner pole 6. The diaphragm 2 is driven by the driving force of the coil 7
and the magnet 8 and is configured by EndPage: 1), and a sound pressure is generated in the ear.
In such a configuration, management of the value of the magnetic gap 13 is important in order to
achieve a practically safe sensitivity. Conventionally, in order to obtain a prescribed gear size, the
above-described magnetic circuit components are fixed by caulking or the like, and then the
outer pole 5. A cutting operation is necessary to ensure flatness of the pole face of the inner pole
6 and to absorb the deviation of the height dimension of the diaphragm 2 to make the distance Y
with the upper surface of the frame 14 a constant value. Furthermore, the work of anti-corrosion
measures (paint etc.) of a cutting surface was needed, and there was a fault that the number of
processes at the time of manufacture increases. The present invention eliminates these
drawbacks and improves productivity, and at the same time achieves a reduction in the number
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of parts used and an improvement in the magnetic properties to realize a reduction in price and
an increase in performance. is there.
Electromagnetic transformer
The present invention will be described in detail below with reference to the drawings. 2 (a) and
2 (b) show an embodiment of the present invention, and FIG. 2 (a) is a side sectional view, and
FIG. 2 (b) is a cross section taken along line AA of FIG. 2 (a). FIG. In these figures, 21 is a cover,
22 is a diaphragm, and 23 is an armature, which is attached to the central portion of the
diaphragm 22. The reference numeral 24 denotes an inner bottom plate, the reference numeral
25 denotes an outer pole, and the reference numeral 26 denotes an inner pole. The inner pole 26
is attached to the central portion of the inner bottom plate 24 by caulking or the like. The coil 27
having the terminals 29. 24] 'is inserted into the inner pole 26, and the ring-shaped magnets 28
are placed on the row side. The inner electrode bottom plate 24 is provided with several
projections 31 having a certain length as shown in FIG. 2 (b) in a portion of the gap 30 opposed
to the outer pole 25 by pressing or the like. The outer pole 25 is press-fitted to the magnetic
circuit to constitute a magnetic circuit. At this time, the upper surface portion of the outer pole
25 and the upper surface portion of the inner pole 26 are set at the time of press fitting so as to
be in the same plane. Incidentally, 32 is provided in the inner electrode bottom plate 24 and one
hole is formed, and 33 is a gear tube? Show. The diaphragm 22 having the armature 23 is placed
on the upper end face of the inner electrode bottom plate 24, and the cover 21 is crimped to
constitute a receiver. The electromagnetic transformer thus configured is realized to remove the
rustproofing work required by cutting as well as cutting by one plate which achieves the flatness
of one magnetic pole face required in the conventional example. . Furthermore, the inner
electrode bottom plate 24 also has a frame on which the diaphragm 22 is mounted. For this
reason, the magnetic gap 33 can obtain a required value by setting the distance between the
upper surface of the inner electrode bottom plate 24 and the inner end surface of the inner 4 v
26 precisely and this can be compared according to the ordinary machining It is achieved easily.
Further, in addition to the feature that the number of parts such as a frame can be reduced and
the number of manufacturing processes such as cutting and rustproofing operations can be
reduced as compared with the conventional example, the following features are also provided.
That is, the first point is in the realization of the braking hole. The damping action of the
vibration system can be realized by setting the dimension of the gap 30 formed by the projection
31 provided on the inner electrode bottom plate 24 and the outer pole 25 to an appropriate
value as shown in FIG. 2 (b). , It is effective in flattening of sensitivity frequency characteristics.
Next, the second point of the feature is to contribute to the improvement of the efficiency of the
magnetic circuit characteristics by providing the gap 30Y. That is, the alternating magnetic flux
generated by the coil 27 has the inner pole 26. アーマチュア23. Outer pole 25. Magnet 28. In
addition to forming a circuit path returning to the inner pole 26 through the inner pole bottom
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plate 24, the inner pole 26.
アーマチュア23. Outer pole 25. It has a bypass from the inner bottom plate 24 to the inner
pole 26. Since the magnet 28 has a larger magnetic resistance than the inner electrode bottom
plate 24 with respect to the AC magnetic flux generated by the fill 27 in this bypass, the
magnetic resistance of the AC magnetic flux can be obtained by providing the gap 30. The
magnetic coupling coefficient is a dog because the reduction effect of This can improve the
magnetic characteristics without using a specially prepared magnetic shunt ring or the like. In
this embodiment, although the bank cover 15 shown in FIG. 1 of the prior art is shown with the
shape removed, it is not shown in the inner electrode bottom plate 24 of the embodiment of FIG.
2 (a). The back cover 15y! Is provided by providing several openings 32 in the portion. By
eliminating the rear surface open type acoustic vibration system, the degree of freedom of the
vibration system is made equal to that of the conventional example, and the desired acoustic
characteristics can be realized. EndPage: 2 FIGS. 3 (a) and 3 (b) are other embodiments of the
present invention, FIG. 3 (a) is a side sectional view, and FIG. 3 (b) is a B-- FIG. It is a sectional
view by the B line. In this figure, the difference from Figure 2 is outside +? A protrusion 34 is
provided on the circumference of 25 and the portion of the inner electrode bottom plate 24
facing the outer pole 25 is formed in a planar shape, and its assembling method and effects are
the same as in the embodiment of FIG. The same as in the case shown, but since the inner
electrode bottom plate 24 does not have a notch as in the embodiment of FIG. 2 (a), the
configuration of the rear face sealed type is also possible by omitting the opening 32. . 4 (a), 4 (b)
and 4 (c) show still another embodiment of the present invention, FIG. 4 (a) is a side sectional
view, and FIGS. 4 (b) and 4 (e) are It is a perspective view which shows the shape of the outer
pole of FIG. 4 (a), and an inner pole bottom plate. In these figures, reference numeral 35 denotes
a frame, which has a cylindrical shape, and a cover 21. The diaphragm 22 is fixed 4) having a
first step. The frame 35 is configured such that the outer electrode 25 and the inner electrode
bottom plate 24 are press-fitted and fixed to have a dimension of 16 degrees between the
diaphragm mounting surface and the magnetic pole surface. 4 (b) shows an example of the shape
of the outer pole 25 having the projection 36, and FIG. 4 (c) shows the projection 37 (on the
projection 36 of the outer pole 25) on the upper surface of the outer peripheral portion of the
inner bottom plate 24. 1) an inner bottom plate 24. having a small size) and having a recess at
several places on the outer surface. At a position where the protrusions 36 and 37 of the outer
pole 25 coincide with each other, the frame 35 is press-fit and configured as shown in FIG. 4 (a)
K. According to this embodiment, a gap 30 is formed by the damping element of the vibration
system and L2, and the height of the projection 37 of the inner electrode bottom plate 24 is
appropriately dimensioned to obtain the magnetic shunt effect. It is possible to install at the
operating point of and the appropriate point of the AC characteristics.
In the embodiment shown in FIG. 4, although the outer pole 25Y has a flat plate shape and the
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inner bottom plate 24Y has a cup shape, they may be formed in reverse shapes to each other.
Note that although the two explanations described the operation of the electromagnetic
converter as a receiver, it is to be said that the present invention is also advantageous to the
electromagnetic type transmitter because of the reversibility of the electromagnetic converter.
Nor. As described above, the present invention achieves a reduction in the number of parts by
combining the inner electrode bottom plate and the frame, etc. (It is necessary to cut the pole
face to increase the dimensional accuracy of the magnetic cap to maintain high performance.
Since it can be constructed without any problem, the antirust coating operation is also
unnecessary. In addition, the grooved dimension of the gap between the outer electrode and the
inner electrode bottom plate is advantageous in that the function as a braking element as well as
the effect as a magnetic shunt capable of realizing improvement of magnetic characteristics can
be realized.
4. Brief description of the drawings Fig. 1 shows an example of a conventional electromagnetic
transducer, Fig. 1 (a) is a top view, Fig. 1 (b) is a bottom view, Fig. 1 (c) 1 (b) is a cross-sectional
view taken along line A-B-C-0-D, and FIGS. 2 (a) and 2 (b) show an embodiment of the present
invention. a) is a side sectional view, FIG. 2 (b) is a sectional view taken along the line AA of FIG.
2 (a), and FIGS. 3 (a) and 3 (b) show another embodiment of the present invention 3 (a) is a side
sectional view, FIG. 3 (b) is a sectional view taken along the line B-B in FIG. 3 (IL), and FIG. 4 (a).
(B) and (c) show still another embodiment of the present invention, and FIG. 4 (a) is a side
sectional view, and FIGS. 4 (b) and 4 (c) are FIG. 4 (&). It is a perspective view which shows the
shape of an outer pole and an inner pole bottom plate. In the figure, 21 is a cover, 22 is a
diaphragm, 23 is a 1-mutu 7.24 is an inner bottom plate, 25 is an outer pole, 26 is an inner pole,
2T is a coil, 28 is a magnet, 29. 29 'is a terminal, 30 is a gap, 31 is a protrusion, 32 is an
aperture, 33 is a gap, 34 is a protrusion, 35 is a frame, and 36. 37 is a protrusion. EndPage: 3
FIG. 3 (a) 526 FIG. 4 (a) EndPage: 5 Warning: Page Discontinuity
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