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■ Small sound generator ■ Japanese Patent Application No. 46-23762 [phase] Application No.
46 (1971) Published April 14 47-37967 @ Akira 47 (1972) December 2 @ inventor country ChuYu Tokyo Nerima Ward Sekimachi 3-1050 inventor Iinuma Yoshio Hino City Tamahei 5-10-5 ■
Applicant Citizen Watch Co., Ltd. Nishi-Shinjuku 2-chome 1-1, Shinjuku-ku, Tokyo Details of
invention invention attorney patent attorney Toshihiko Kanayama DESCRIPTION The present
invention relates to a miniature acoustic generator incorporated in a watch band, or case, with a
battery as a power source. In the past, wristwatches equipped with electronic sound generators
have not been commercially available. In recent years, the case of a watch is mostly a waterproof
case, and the watch is in a sealed or closed space. Therefore, it is preferable that the wristwatch
equipped with the electronic sound generator also be waterproof. However, when the sound
generator is disposed in the watch case, it is possible to generate a sound level that allows human
hearing from the inside of the watch case. It is difficult, and in order to generate sufficient sound
volume, the sound generator is large, power consumption is large, a battery with a large capacity
is required, and the wristwatch itself becomes large. The same is true even if the band is provided
with a waterproof case and the sound generator is disposed therein. Furthermore, the diaphragm
is a part of the waterproof case by devising the diaphragm which becomes the sound source of
the sound generator, and the diaphragm directly transmits the sound to the outside without
passing through the wall of the waterproof case. The side is a free space and the other forms a
closed space, which also increases the load on the vibrating membrane, which is also undesirable.
The vibrating membrane is easily broken because it is in direct contact with the external free
space 9) Purpose of the present invention In order to improve the above-mentioned drawbacks,
the point is to make the case and the vibrating membrane for sound and the closed space, the
case and the vibration form the waterproof wall, and the vibrating membrane is the content of
the closed space An object of the present invention is to reduce the vibration load of a vibrating
membrane by a vehicle that takes a product invariant vibration mode. Furthermore, by providing
a protective member on the inside of the vibrating membrane, it is possible to prevent breakage
against excessive external pressure. Next, an embodiment of the present invention will be
described with reference to the drawings. In each drawing, 1 is an upper lid and has a large
number of small holes 1a for sound emission. Reference numeral 2 denotes a body, which has a
protective portion 2a that supports and prevents breakage when an excessive external pressure
is applied to the acoustic diaphragm 4 and a large number of holes 2b that facilitate movement
of fluid in the case. 3 is a back cover, 5 and 6 are waterproof 0-rings. The vibrating membrane 4
is supported on the outer peripheral portion 4a by the upper portion 1 and the body 2 and is
supported between the outer peripheral portion 4a and the body 20, and a waterproof O-IJ cloth
5 is disposed.
If the vibrating membrane 4 is made of a polymer material etc. vibration [111111] EndPage: 1
membrane 4 and the shell 2 which is a part of the case, the back cover 3 and the 0-ring 5.6 for
waterproof make a closed space and make a waterproof case Form A floating plate 7 is fixed to
the projection 4b of the vibrating membrane 4 at its central portion 7a, and the permanent
magnet 8 is further fixed. An inner frame 9 has two holes 9a, in which handle portions 7b at both
ends of the floating plate 7 are rotatably engaged. A coil 10 is disposed on the outer periphery of
the permanent magnet 8 as shown. An alternating current flows in the coil 10 by an electric
circuit (not shown) disposed in the case inner space 11. The polarity of the permanent magnet is
magnetized in parallel with the vibrating film 4 as shown in FIG. Next, the operation of the
acoustic diaphragm 4 will be described. Assuming that the direction of the current flowing
through the coil 10 is as shown in FIG. 3, the permanent magnet receives a couple in the
direction of the arrow shown in FIG. 3 to generate a rotational force in that direction.
Accordingly, the vibrating membrane 4 also moves in the direction shown, that is, one moves in
the direction to increase the volume in the closed space and the other in the direction to decrease
the volume, so that the inner volume in the closed space is kept substantially constant. When the
direction of the current flowing through the coil 10 is reversed, the permanent magnet 8 receives
a couple of forces reverse to that described above, and the vibrating membrane 4 also moves in
the opposite direction to that described above. Therefore, the permanent magnet 8 repeats the
rotational reciprocating motion by the alternating current, and the vibrating membrane also
repeats the above-mentioned motion, so that the internal volume in the closed space is kept
substantially constant. In addition, the pressure difference of the fluid in the vicinity of the
vibrating membrane 4 in the closed space is promptly eliminated, and in order to facilitate the
flow of the fluid, the protective portion 2a of the barrel 2 is provided with a plurality of holes 2b
of a number rllllllN. Therefore, the protective portion 2a of the body 2 prevents the destruction
of the vibrating membrane 4 against an excessive external pressure against the vibrating
membrane 4, and the holes 2b serve as a fluid flow path in the closed space during normal
vibration to facilitate flow and vibrate Reduce the load on the membrane 4 Furthermore, since
the vibration of the vibrating membrane 4 does not change the internal volume of the closed
space, the pressure balance with the external pressure does not break and the load applied to the
vibrating membrane is small, and hence the power consumption can be reduced. By using a part
of the waterproof wall of the vibrating membrane, waterproofness is maintained. The protective
film 2 can be easily protected by the upper lid 1 and the protective portion 2 a of the body 2, so
that it is hard to be broken. The vibration mode of the vibrating film 4 can be changed by
changing the magnetization direction of the permanent magnet by 90 degrees. In addition, it is
possible to attach a piezoelectric substance or the like different in polarity at a point symmetrical
position to the center of the vibrating membrane so that the vibration mode of the vibrating
membrane is invariant to the internal volume of the closed space. As described above, the
present invention has a great effect such as making a watch having an electroacoustic generator
waterproof, reducing the vibration load of the diaphragm, reducing the power consumption and
reducing the size.
BRIEF DESCRIPTION OF THE DRAWINGS Each drawing shows an embodiment of the present
invention, and FIG. 1 is a plan view, FIG. 2 is a cross-sectional view taken along the line II ′ of
FIG. 1, and FIG. It is a cross-sectional view taken along the line-. 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · body, 3 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
Vibration film for sound [111111]EndPage: 2