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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a miniature electroacoustic
transducer according to the present invention, FIG. 2 is a sectional view of FIG. 1, and FIG. 3 is a
case of the transducer of FIG. It is an enlarged view of a joint part with a diaphragm. 1 ... hole of
sound emission, 2 ... case of converter, 3 ... plate, 4 ... center ball, 5, 5 '... [, 6.6' ... Coil, T:
Diaphragm, 8: Watch case, 9: Screw, 10: Small protrusion, 11: Mold agent. Fig. 1-57-Japanese
Utility Model Application Publication No. 52-19219 (2) Fig. 2 Fig. 3-58-
[Detailed description of the invention]-Name of the device of the invention Small electro-acoustic
transducer practical model model claim claim category 0-Place the excitation coil and the magnet
on the plate which has a center ball and a magnetic body, and its center pole And an electroacoustic transducer in which a diaphragm made of a magnetic material is disposed at an
appropriate spacing from the magnet and an O gap, a small protrusion is provided on a case for
housing a cough electro-acoustic transducer, and the diaphragm An electro-acoustic transducer
characterized in that v5 water resistance is secured by supporting a soft silicone resin-based
molding agent on the supporting portion. The present invention relates to a magnetic type smallsized electroacoustic transducer used for a portable device, and in particular, to ensure the O
waterproofness. ̀Th (11) In the prior art, for example, it is necessary to make a magneto-type
electroacoustic transducer such as that found in earphones waterproof. This is because such a
device is used, 0TIi is almost indoors, and there are very few companies that are used outdoors in
the rain. However, when used in portable small devices, for example, wristwatches, it is often
necessary to be in a more severe environment, and it is necessary to protect the mechanism from
the open air. In recent years, in view of the progress of magnetic materials, it is possible to
miniaturize by using a magnetite (tuck type electroacoustic transducer t, for example, a high
magnet material such as samarium cobalt), and for a watch only emitting an alarm sound. The
need for a wide frequency range has also made this type of converter simple in construction to
be powerful. Therefore, the object of the present invention is to make the magnetic type Of
converter having such merits a structure that can be used for a portable device such as a
wristwatch, while securing the carriage performance with a simple structure. In the following, the
structure of the present invention will be described according to the m-plane; and (: Reno 1 is a
plan view) is a sound emission hole provided in the case 2 of one company. 2 is a cross-sectional
view h), the principle of the stuttering is the well-known magnetic acoustic transducer (0), that is,
3 is a plate of magnetic material or center pole 4), 5 is ring-shaped The magnet of Reference
numeral 6 denotes a vibrating plate made of an excitation coil and magnetic materials from
seven companies. The converter case 2 is in close contact with the watch case 8 by means of a
screw 9. In FIG. 3, the diaphragm 7 and the case 2 shown in FIG. 2 are enlarged in size, and they
are supported by the small projections 10 provided on the case 2 so as to support the side of the
reference vibration plate 7. And by adhering to this support as a silicone 'j 14 fat-based soft mold
agent 11 會 figure, the diaphragm 70 keeps the waterproofness without preventing the vibration
of the diaphragm 70 and the structure like 0 or more of the hour hand movement C
Waterproofness, and waterproofness of the transducer itself are maintained in a butterfly-like
quick structure 0 As is well known, the area around the diaphragm 70 is fixed by a method such
as an adhesive or screw tightening. O suffers from the disadvantage of sharpening the natural
The present invention uses a soft b silicone resin mold agent to enhance the performance of the
converter and the performance of 51, 1 and 0 being free only by the periphery of the diaphragm
itself. According to the structure described above, first, since the case of the converter also serves
as the support member of the diaphragm, the number of parts is small and the structure is
simple. In addition, since the watch movement is made waterproof by the contact of the case of
the converter and the case of the converter, the close contact between the diaphragm and the
case of the converter is sufficient if the waterproofness in the converter is maintained. A lowimpact soft mold agent is sufficient 69, a converter of good performance is possible. In addition,
the converter itself has an effect such as rounding, which is a structure that fits in one case,
conversion on after-sales service, or versatility, which is advantageous for a large number of
main seats. Simple of drawing! 11! 1 is a plan view of a hand-held electric t4I converter
according to the present invention, and FIG. 2 shows the case of the converter of FIG. It is an
enlarged view of a part. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 4 center plate 5, 5 '. · · Diaphragm 8 · · · hour hand case
9 · · · screw portion 10 · · · small projections 11 · · · mold agent or more 6- 蜆 agent best product
ball '(2)) 1 Figure ○ O ○ 2 2 Figure 127 ', ..., +81 哩 "5 ° 6 ° 4 fourth 31111.7! す