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In the sound generator for an electromagnetic watch comprising an acoustic diaphragm and a
fixed permanent stone and a fixed excitation winding, a columnar magnetic magnet is formed at
the center of a cup-shaped yoke made of a magnetic material. A center yoke made of a material is
provided, and an acoustic vibration thin plate is disposed at the center of the cup-shaped yoke so
as to create a gap between the center and the center, and the excitation winding is filled in the
cup-shaped bottom of the yoke. What is claimed is: 1. A sound-generating body for a watch,
characterized in that a step-shaped winding is formed, and a hollow disk-shaped radially
magnetized permanent magnet is disposed at the step. 3. Detailed description of the invention
For sound emitting watch or alarm, especially watch, sound emitting body for J watch is
becoming more and more required to be small and thin. The invention is based on the abovementioned needs, and an object thereof is to provide a small and thin electromagnetic sound
generator, and relates mainly to the structure. The invention will be described in the following on
the basis of the drawings. FIG. 1 is a cross-sectional view of the main structure of the sounding
body for a timepiece according to the present invention. FIG. 2 is a main structural crosssectional view of another embodiment of the present invention. 3 and 4 show the shape of the
permanent magnet used in the present invention. FIG. 5 is an application explanatory view of a
known drive circuit of the sounding body of the present invention. -In FIG. 1, 1 is a circular
acoustic vibration thin plate, 2 is a magnetic disk made of a magnetic material fixed at the center
of the acoustic imaging thin plate 1, 3 is a cup-like yoke made of a magnetic material, 4 is a cuplike yoke 3 A cylindrical central yoke fixed at the center of the, and 5 is a hollow disk-shaped
permanent magnet, and is magnetized so that the same magnetic pole is formed on the inner
peripheral surface of the hollow and the same magnetic pole is formed on the outer periphery. 6,
an exciting winding is provided with a stepped portion in the axial direction as shown in the
figure, and the outer periphery of the exciting winding closer to the acoustic imaging plate is
made smaller, and the above-mentioned permanent magnet is inserted in the stepped portion 6 '.
Arrange as. 7 is a diaphragm of a hollow circular thin plate, 8 is 0. The IJ ring 9 is for
suppressing the O-ring, and 10.11 is an input terminal of the excitation winding 6. The excitation
winding 6 and the permanent magnet 5 are assembled and fixed in order from the top with
respect to the central yoke 4. EndPage: In FIG. 2, the magnetic disk 2 has an end 2?. The cup 2a
is provided in the form of a cup in a groove 12 concentric with the central yoke 4 formed by the
permanent magnet 5 and the excitation winding 6 so as to be vertically movable in the axial
direction. FIG. 3 shows a hollow disk-shaped permanent magnet used in the present invention,
which may be a sintered ferrite magnet, a plastic-filled ferrite magnet, or any other permanent
magnet. Fig. 4 is effective for improving the efficiency of the other material and shape of the
permanent magnet shown in Fig. 3, and this shape is sintered after die molding magnetic field
treatment, and secondary processing or machining is omitted. May be
In this case, although four permanent magnets 5 of 5?, 51r, '5c', and '5d are used, the number
of permanent magnets 5 may be appropriately selected, such as two or five, depending on the
necessity of the strong bias magnetic field. You may increase or decrease. In the case of a
sounding body that emits a muzzle, the resonance frequency shifts slightly due to variations in
the air gap length and the magnet strength of the electromagnetic type. For this reason, in order
to equalize the resonance frequency, the gap length is adjusted for normal production. If the
resonance frequency is shifted to make it an oscillation type, it is not necessary to adjust the
above-mentioned air gap length. The pigeon excitation winding 6 simultaneously winds the drive
winding 66 and the detection winding 6?, and is disposed between the collector of the transistor
14 and the emitter base. 13 is a DC stop capacitor, and 15 is a bias resistor. If the voltage voltage
16 is applied to the 11th and 18th words at the time of day, it oscillates at the resonance
frequency. As apparent from FIGS. 1 and 2, according to the present invention, since the
excitation winding and permanent magnet ? can be arranged in the limited space, the space
efficiency is improved, and the small type is formed. Thinning can be achieved. Particularly in the
configuration of FIG. 2, since the bias magnetic flux of the permanent magnet 5 interlinks as in
the magnetic disk 2?-2-center yoke 4, the conversion efficiency is improved. FIG. 1 is a
simplified view of the structure of FIG. According to the invention: (73 C 'tt B at a distance of 11
cm, LO cm apart to 2 at 11 x 2.5 mm mm), ?. The characteristic can be improved to about 5 [V],
55 mA:], and it is suitable as a sound generator for a watch alarm and melody radiation, and has
a simple structure and a small number of parts, and the practical effect is remarkable.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view of the main structure of a
sounding body for a watch according to the present invention, FIG. 2 is a cross-sectional view of
the main structure of another embodiment of the present invention, and FIGS. Explanatory
drawing of the permanent magnet used for invention, FIG. 5 is application explanatory drawing
of well-known 1 drive circuit. DESCRIPTION OF SYMBOLS 1 ... acoustic circular thin film moving
plate, 2 ... magnetic disk, 3 ... cup-shaped yoke, 4 ... column-shaped center yoke, 5 ... hollow diskshaped permanent magnet, 6 ... step Excitation winding, 7 ... diaphragm restraint 7 / ? ?, 8 ... O
ring, 9 иии 0 ring suppression, 1 o 111 excitation winding input terminal. Patent applicant Nichizu
/ Clock Co., Ltd. Attorney patent attorney Toshihiko Kanayama-\, Q / Fig. 1 End Page: 2 Fig. 3
End Page: 3 Procedure correction book Showa Date 1, display of case Showa Patent Application
No. No. 2 Related to the name case of the invention Patent applicant Tokyo Nishiki Shinjuku 2
chome No. 1 No. 1 Citizen Watch Co., Ltd. (8150) Patent attorney patent attorney Toshihiko
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