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JPS5834381

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DESCRIPTION JPS5834381
[0001]
The present invention relates to a sound generator structure of an electronic watch having a back
cover as a part of a sound generator. Generally, in an electronic watch, a sound generator (socalled piezoelectric buzzer) using a piezoelectric element is often selected from the viewpoint of
cost as a sound generator for generating a sound such as an alarm or a melody. The structure of
the piezoelectric buzzer is a bending-type asymmetric disc bimorph by sticking a piezoelectric
element such as lead zirconate titanate (PZT) -based ceramic concentrically on a thin metal disc
made of titanium, stainless steel, brass or the like. Many are provided with a space between the
watch movement and the back cover. A piezoelectric buzzer using such a thin metal disk as a
diaphragm has high electroacoustic conversion efficiency and can extract high sound pressure.
However, in order to take out the sound of the piezoelectric buzzer from the back lid side, it is
necessary to provide a hole for sound emission in the back lid, and the processing step of the
back lid is not only one process increase, but Because there is penetration, waterproofing
measures are also necessary. Father, it was necessary to provide a space between the movement
of the watch and the back cover to arrange the piezoelectric buzzer, and it had the disadvantage
that the exterior of the watch would be thick. As a method of solving the above-mentioned
drawbacks, conventionally, the method of omitting the diaphragm, directly attaching the
piezoelectric element to the back lid, and using the back lid as the diaphragm has been adopted.
A sound generator having the above configuration will be described below with reference to
FIGS. 1 and 2. FIG. 1 is a cross-sectional view of an essential part of an electronic watch using the
back cover as a diaphragm, and FIG. 2 is a plan view of the back cover shown in FIG. There is. A
disk-shaped piezoelectric element 1 and a back cover 2 are formed by concentrically bonding the
piezoelectric element 1 to the back cover 2 to form a sounding body 9 of the electronic
timepiece. Reference numeral 3 denotes a case shell, and the shell 6 and the back cover 2 are
joined by a spray structure constituted by a spray portion 6a formed on the barrel and a spray
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portion 2a formed on the entire periphery of the back cover 2. The reference numeral 4 denotes
a glass, and together with the back cover 2 and the body 6, constitute a watch case 5. 6 is a
watch movement (details are omitted), 7 is an OIJ ring, 8 is a waterproof middle frame, and the
waterproof middle frame 8 and the body 3 form a 0 ring box 7a, which is arranged in the O ring
box 7a. The waterproof structure of the watch case 5 is formed by compressing the set 0 ring 7
with the back cover 2. At the same time, the movement 6 of the watch is fixed in the watch case
5 by the waterproof middle frame 8 utilizing the compression force of the O-ring 7. As described
above, by sharing the back cover 2 as the diaphragm of the piezoelectric buzzer, it becomes
possible to make the back movement 2 of the watch move closer to the back cover 2, and only
the thickness reduction of the watch case 5 can be achieved. It is not necessary to make a hole
for sound emission in the back cover 2, and waterproofing measures become easy.
This type of sounding body 9 has a slightly lower sound pressure because the thickness of the
back cover 2 corresponding to the diaphragm is thicker than a piezoelectric buzzer using a
dedicated diaphragm, but it is practically used as a buzzer for a watch. Sound pressure without
any trouble is obtained. However, as watch designs have diversified in recent years, a square case
structure has been required. However, in order to facilitate processing, such a square-shaped
back cover has a structure in which the spray unit is provided only on a pair of opposing sides
without being provided over the entire circumference. However, when the piezoelectric element
is directly adhered to the back cover having the above-described configuration to constitute the
sound generator, a drawback arises that a sufficient sound pressure can not be obtained. The
reason why the above-mentioned defect occurs will be described below with reference to FIG. 3
and FIG. FIG. 3 shows a cross-sectional view of an essential part of an electronic timepiece having
a spray structure on a pair of opposite sides of a back cover, and FIG. 4 shows a plan view of the
back cover of FIG. Reference numeral 12 denotes a square-shaped blowing portion 12a on a pair
of opposite sides. The back cover 12b is connected to the cylinder 16 by spraying with a groove
13a provided on the cylinder 13 and another groove not shown. 1 is a disk-shaped piezoelectric
element, and 19 is a sound generator. A glass 14 forms a watch case 15 together with the back
cover 12 and the body 16. 16 is a watch movement (details are omitted), 17 is an O-ring, and 18
is a waterproof middle frame. In the above configuration, since the body 16 and the back cover
12 are connected by the spray parts 12a and 12b provided on the pair of opposite sides of the
back cover 12, the blow parts are formed all around the back cover The sound pressure is lower
than that of the above structure. That is, in the case of the all-round spray structure, as shown in
FIG. 1, the back surface is formed by the spray portion 2a formed on the entire periphery of the
outer periphery of the back cover 2 and the spray portion 6a formed on the waist. The lid 2 is
fixed to its periphery, and the radial vibration (the direction of displacement is radial) of the diskshaped piezoelectric element 1 is converted to the bending vibration of the back lid 2 under the
condition equivalent to the forced vibration of a so-called fixed peripheral circular diaphragm. In
the case of the blowing structure in which the blowing parts are formed on a pair of opposite
sides as compared with the conversion, as shown in FIGS. 3 and 4, the opposite sides 12c and
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12d of the back lid 12 without the blowing part. The side is a semi-free support where reaction
force against the compression of the O ring 17 acts, and in the radial direction vibration of the
disc type piezoelectric element 1, the opposite side 12c, 12d direction of the back lid 12 without
the spray part. When the vibration is converted into the bending direction bending vibration
shown in FIG. For bending in the A direction among the directions, the back lid outer peripheral
surface 12c, 12d abuts on the cylinder 16 to become a support part, but in the reverse direction,
that is, supporting in the A 'direction There is a drawback that the conversion efficiency from the
radial vibration of the piezoelectric element 1 to the flexural vibration of the back cover 12 is
deteriorated because there is no part.
In addition, the opposite sides 12c and 12d of the back cover 12 without the blowing part is a
semi-free support that only the reaction force against the compression of the 0 ring acts, so that
the OIJ song 7 is a kind of damper such as anti-vibration rubber. As a result, the bending
vibration in the direction of the arrow AA 'of the back cover 12 is damped, and the conversion
efficiency from the radial vibration of the piezoelectric element 1 to the bending vibration of the
back cover 12 is deteriorated. Even in a quiet room, I could only get a sound pressure that I could
hear at last. The present invention secures an acceptable sound pressure (70 dB or more when
the A filter of the sound level meter is used) suitable for practical use even in the watch case 15
of the opposite side spray structure where the processing of the body and back cover spray part
is easy. An object of the present invention is to form a square-shaped spray unit on a pair of
opposite sides and comprising a back cover coupled by a cylinder and a spray structure and a
substantially rectangular piezoelectric element; The piezoelectric element is bonded to the back
cover in alignment with the opposing direction of the spray section of the back cover to
constitute a sound producing body of the electronic timepiece. That is, when the piezoelectric
element is changed from square to rectangular, the vibration mode changes from contour
vibration (area vibration) to longitudinal vibration (extension vibration of the rod), and the
displacement direction is that of the piezoelectric element. It is known that the direction is the
long side, and the present invention is suitable for practical use also in a watch case 15 in which
the processing of the barrel and back cover sprayer as shown in FIG. 3 is easy by utilizing this
phenomenon. Allows for acceptable sound pressure. The present invention will be described in
detail with reference to FIGS. 5 to 7 below. FIG. 5 (A) is a plan view of a sounding body of an
electronic timepiece showing an embodiment of the present invention, and FIG. 5 (B) is a side
view of FIG. 5 (A). The sounding body of the electronic clock comprised using the back cover 12
of FIG. 3 is shown. Reference numeral 11 denotes a substantially rectangular piezoelectric
element made of lead zirconate titanate (PZT) -based ceramic or the like, and the piezoelectric
element 11 has its longitudinal direction (arrow B-B 'direction) and the spray parts 12a and 12b
of the back lid 12. The sounding body 20 of the electronic timepiece is constituted by bonding
the back cover 12 with the facing direction of the electronic watch. That is, the substantially
rectangular piezoelectric element 11 is bonded to the back cover 12 by aligning its longitudinal
direction (the arrow BB 'direction) with the opposing direction of the spray parts 12a and 12b of
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the back cover 12, thereby shortening the piezoelectric element 11 Vibration in the side
direction (arrow c-c 'direction), that is, in the opposite side 12c, 12d direction of the back lid 12
without the blowing part, is suppressed, and the piezoelectric element 11 actively vibrates in the
long side direction (arrow B-B' direction) As a result, most of the energy for driving the
piezoelectric element 11 is converted into longitudinal vibration.
And since this longitudinal vibration of the piezoelectric element 11 is converted into bending
vibration in the direction of the arrow AA 'of the back cover 12, most of the energy for driving
the piezoelectric element 11 is bending vibration of the back cover. As a result of the conversion,
a sounding body 20 capable of securing an acceptable sound pressure suitable for practical use
was obtained. FIG. 6 is a cross-sectional view of an essential part of an electronic watch
incorporating a sound producing body showing another embodiment of the present invention,
and FIG. 7 (A) is a plan view showing the sound producing body incorporated in the electronic
watch of FIG. 7 (B) shows a side view of FIG. 7 (A). Reference numeral 21 denotes a substantially
rectangular piezoelectric element, and 22 denotes a back cover having square-shaped and
blowout portions 22a and 22b having a window cut out on a pair of opposite sides, and the
piezoelectric element 21 has a longitudinal direction and a spray portion 22a of the back cover
22 The sounding body 29 of the electronic watch is configured to be bent and vibrated in the D, D 'force direction by being bonded to the back lid 22 in alignment with the opposite direction of
the 22b. Reference numeral 26 denotes a cylinder, and the cylinder 26 is provided with a groove
23a and another groove not shown, in which a spring 60 is fixed by welding or the like, and a
window provided in the spring 60 and the back cover 22 The torso 26 and the back lid 22 are
connected by blowing the removed blowing portions 22a and 22b. 24 is glass, 25 is a watch
case, 26 is a watch movement, 27 is a 0 ring, and 28 is a middle frame. The sounding body 29 of
FIG. 7 is different from the sounding body 20 of FIG. 5 in the spraying structure of the back
cover 22 serving as the diaphragm, but the connection relationship between the back cover and
the trunk with respect to the bending of the back cover 22. Are the same, and have the same
effect as the sound generator 20. As described above, according to the present invention, the
vibration of the piezoelectric element can be efficiently converted into sound because the back
cover is bent and vibrated by positively utilizing the vibration of the piezoelectric element (long
and long sides) direction. . Therefore, by using the sounding body according to the present
invention, it is possible to miniaturize and reduce the thickness of a watch with a back lid buzzer
using a watch case having an opposite side spray structure that facilitates processing of the
spray portion of the body and back lid. This makes it possible to create fashion-rich products. In
this embodiment, although the shape of the back cover is all square, even if it is a round shape
other than a square, the opposing direction of the spray portion of the back cover and the
longitudinal direction of the substantially rectangular piezoelectric element are bonded together
The same effect can be obtained by configuring the sound generator.
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[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of an essential part of an electronic watch using a conventional back
cover as a diaphragm, FIG. 2 is a plan view of the back cover of FIG. 1, and FIG. 3 has a spray
structure on which the present invention is premised. The principal part sectional view of an
electronic watch.
FIG. 4 is a plan view of the back cover of FIG. 3; FIG. 5 (A) is a plan view of a sounding body
showing an embodiment of the present invention, and FIG. 5 (B) is a sectional view of FIG. 5 (A).
FIG. 6 is a sectional view of an essential part of an electronic watch showing another embodiment
of the present invention. FIG. 7 (A) is a plan view showing the sound producing body of FIG. FIG.
7 (B) is a cross-sectional view of FIG. 7 (A). 11.21 ·············· approximately rectangular piezoelectric
element 2.12 · 22 · · · · · · Back cover 2a, 12a, 12b, 22a, 22 b-· ·-Backing part sprayer 6.13.
························· Body 9.19.20.29 · · · · · · Sounding body Fig. 1 Fig. 2 Fig. 3 Fig. 4
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