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The present invention relates to an electromagnetic type electric-sound IIM converter, and it is
an object of the present invention to reduce the diameter and increase the efficiency. It is said
that the aperture diameter is as small as possible due to space limitations, as it is often the case
that an electromagnetic type electric-sound * i converter is used as an alarm sound generating
agent for small electronic devices such as electronic watches etc. However, in the structure of the
conventional electromagnetic type electric-to-blue converter, when the aperture is reduced,
adverse effects such as 1) increase in resonance frequency and 2) reduction in conversion
efficiency appear. Usually, an electromagnetic light-sound III converter is constructed by the
structure shown in FIG. The diaphragm is configured by fixing the support plate (1) made of an
elastic body and the movable yoke (2), and is attached to the yoke (31 via the support frame (4).
The static suction force by (6) and the support plate (held by the neutralization point of the
elastic restoring force of 11 are held. A dynamic magnetic field is superimposed on this by a
fixed excitation coil (6) juxtaposed in an electric circuit, that is, the above-mentioned attractive
force changes and the diaphragm vibrates and generates sound. In this conventional structure, in
order to increase the magnetic coupling, it is necessary to increase the diameter of the movable
yoke (2) to a certain extent. Therefore, if the aperture of the product is reduced, the elastic
portion of the diaphragm narrows. The mechanical resonance frequency indicated by "," $ is
increased. Where m is the mass of the vibration system and C is the other compliance of the
vibration system (a constant representing softness). In order to obtain the volume of the alarm, it
is general to drive at the resonance frequency, and it is not preferable for the hearing that the
resonance frequency is too high. SUMMARY OF THE INVENTION In view of such conventional
problems, the present invention is intended to realize a low resonance frequency and high
efficiency by reducing the diameter of the diaphragm without losing its elasticity and keeping the
magnetic coupling strong. Hereinafter, the present invention will be described in detail with
reference to the illustrated embodiment. The second example illustrates the first embodiment of
the present invention, which is an elastic body whose periphery is supported by an upper end
portion of a yoke-like yoke (10 of a magnetic material) and a yoke. A movable permanent magnet
having a cylindrical or polygonal columnar shape fixed approximately to the center of the
diaphragm αυ so as to form a slight gap (b) between the diaphragm Ql) and the bottom upper
surface of the yoke αO. And a doughnut-shaped exciting coil (G) fixed in the yoke αG while
maintaining a suitable air gap Q4 around the movable permanent magnet (2). According to this
structure, the permanent magnet a1 having a diameter smaller than that of the movable yoke (2)
in the above-described conventional structure is fixed to the support plate, that is, the diaphragm
Qυ. Thus, it is possible to suppress the increase of the resonance frequency.
In addition, since a part of the yoke (2) also serves to support the diaphragm Ql, the support
frame (4!) In the conventional structure. The parts corresponding to can be omitted, and this
aspect is also advantageous for reducing the diameter. Furthermore, even in view of cost, the
supporting frame (41 and the movable yoke (2) are not necessary, and parts cost and assembly
cost can be reduced). 3 shows the second embodiment, and the auxiliary yoke QQ made of a ringshaped magnetic material is circumscribed to the yoke aO in the structure of FIG. 2, and a bond
gap is formed around the permanent magnet. It is added to form. The auxiliary relay rod narrows
the air gap of the magnetic circuit to increase the magnetic flux, and the air gap a 磁石 is
appropriate with the movable permanent magnet (d) and the diaphragm Q1 so as not to prevent
the vertical movement of the vibration system. Keep it in place. As a result, a magnetic circuit is
formed as shown by the dotted line in the figure, and the magnetic resistance can be reduced to
enhance the conversion efficiency. FIG. 4 shows a third embodiment, which is similar to the
structure of FIG. 3, but from the aspect of construction and cost, the auxiliary yoke Q · is a
cylindrical side portion (18 m) of the main yoke (most) And the disk-shaped lower yoke QQ is
provided as a separate part on the horizontal part of the lower end of the main yoke. In the
structure of FIG. 3, it is necessary to lead the lead wire of the exciting coil (2) to the external
input terminal by a method such as providing a through hole in a part of the yoke 00, but
according to the structure shown in FIG. For example, by providing a notch or the like in the diskshaped lower yoke 0, it is possible to lead the lead to the outside relatively easily. In addition,
since the side wall portion (181) of the main yoke (also) which also serves as a support frame is
integrated with the auxiliary yoke α, the auxiliary relay which is important in maintaining the
space between the movable permanent magnet It is also advantageous in terms of improving the
eccentricity accuracy of the center hole of iron a ·. FIG. 5 shows a fourth embodiment, in which a
cylindrical magnetic core 4 made of a magnetic material is fixed to the lower end of the movable
permanent magnet (2). In the structures shown in FIGS. 2 to 4, the static magnetic flux by the
movable permanent magnet and the alternating magnetic flux by the exciting coil (t) pass
through the same path in any case, but in the permanent magnet □□□ The alternating
magnetic permeability is small, and the alternating magnetic coupling is a comparative fishing
line. Therefore, if a structure as represented by the embodiment of FIG. 5 is used, it is possible to
exclude the permanent magnet from the path through which such alternating magnetic flux
passes and to make it bypass. The dotted lines in FIG. 5 indicate the path of direct current
magnetic flux, and the alternate long and short dash lines indicate the path of alternating current
magnetic flux. That is, the path of the alternating magnetic flux is only the yoke and the air gap
by the magnetic material, and the alternating magnetic coupling becomes dense by this.
The alternating magnetic flux is increased, and the conversion efficiency is improved. As
described above, according to the 4111 structure of the present invention, it is possible to reduce
the size and diameter of the electromagnetic type electro-acoustic converter efficiently and
inexpensively without raising the resonance frequency, and an alarm function This contributes
greatly to the reduction in size and weight of the working zone IIa 11 such as an attached
electronic watch.
Brief description of the drawings
FIG. 181 is a structural sectional view showing a general prior art, and FIG. 2 to FIG. 5 are
structural sectional views showing each embodiment of the present invention.
QO is a yoke, (b) is a diaphragm, a3 is a movable permanent magnet, (d) is an excitation coil, Qt 9
is an auxiliary relay, (d) is a main relay, (181) is a side view, and Ql is a lower relay. Iron (1) is a
magnetic core. Fig. 4 74t 7 / / γ
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