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JPS57188186

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DESCRIPTION JPS57188186
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross sectional view showing the structure of
a conventional electronic watch with a buzzer, FIG. 2 is a cross sectional view showing the
structure of an electronic watch with a buzzer showing one embodiment of the present invention,
FIG. 2 is a plan view schematically showing a diaphragm which is an embodiment of FIG. 2, and
FIGS. 4 and 5 are each schematically showing a diaphragm in another embodiment and still
another embodiment of the present invention. It is a top view. ????? IIA, IIB ииииии Diaphragm,
1b, ?1 lb, 11 c, 11 d, 11 e, 1 jf, 11 g ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии и и и и Module и и и и и и и
и и Piezoelectric element и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и watch case, 9 и и и battery,
4 ░ 12 и и и и и device cover, 12b и и и и и Projections.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a
buzzer-equipped electronic watch having a diaphragm inside a back cover. With the rapid spread
of digital electronic watches, stopwatches and buzzers are becoming indispensable functions of
electronic watches. Among the electronic watches with buzzers, those with various structures
have already been offered to the world, among 31 (1) / 8 / ?r, but those with a diaphragm
inside the back cover are suitable for thinning It is most commonly used because it has many
advantages such as low cost (and simple structure and versatile design). The conventional
example will be described below with reference to the drawings. In FIG. 1, the spring for battery
pressing is removed in consideration of thinning, and the buzzer diaphragm disposed on the back
cover side is held by piezoelectric drive. Fig. 6 is a cross-sectional view of a watch structure
showing a conventional example of the type. The diaphragm 1 to which the piezoelectric element
5 is fixed is located on the back cover 2 which is a part of the watch case, and on the back cover
side of the module 6 to cover all or a part of the module 6 And the device cover 4 for holding
parts such as batteries, vibrators, circuit boards, etc., and the outer periphery u1a of the
diaphragm 1 is the backing 7 inserted in the case case 60 and the case It is held and fixed by the
outer peripheral portion 2 a of the back cover 2. In order to reduce the thickness, the battery
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pressing spring is removed (2) 32 so that the diaphragm 1 is provided with a convex portion 1b
by drawing processing corresponding to the area where the battery 9 is disposed, The convex
portion 1 b of the diaphragm is pressed against the back cover 2 by the battery 9 pushed up to
the side of the back cover 2 by the pressing force of the battery receiving spring 10. The
piezoelectric element 5 for vibrating the moving plate 1 is electrically connected to the buzzer
contact spring 8 having one electrode (earth side) on the diaphragm 1 and the other electrode on
the module 6. As a result, the driving plate 11 is vibrated at the same time at a low angle by
integrating and vibrating with a constant frequency drive voltage 11 applied. The sound
generated thereby is emitted to the outside of the case from the sound emission hole 2 b
provided in the back cover 2. In such a structure, a gap is generated between the convex portion
1b of the diaphragm 1 and the back cover 2 due to the variation in processing accuracy of the
diaphragm 1, the back cover 2 or the battery 9, etc. Due to a so-called chattering phenomenon
that slightly contacts or separates with parts or the battery 9 and the back cover 2 when
vibrating, the volume decreases or the tone is distorted. 13) On the other hand, even if the
convex portion 1b of the diaphragm 1 is in contact with the back cover 2 by the battery 9, it is
also in the form of a half stroke due to variations in processing accuracy and artificial warpage
that occurs during assembly. As described above, a drop in volume and a distortion in tone will
occur.
Furthermore, although the force with which the convex portion 1b of the diaphragm 1 hits the
back cover 2 depends on the pressing force of the battery receiving spring 10, the battery 9
jumps out when the back cover 2 is removed, or In consideration of the durability of the battery
10, the battery receiving force 10 (7) pressing force. + I limit on size, usually, yo q и ?: J toog ~
200.! ?? ?? Yew Yuu Yuwa 15. However, with this degree of pressure, the force is not
sufficient to overcome the frictional force when the side surface of the battery 9 contacts the
module 6 or the device cover 4, and a gap is generated between the battery 9 and the diaphragm
1. The two are only barely in contact, or the battery 9 is pushed up obliquely and the convex
portion 1b of the diaphragm 1 is not correctly pressed against the back cover 2, resulting in a
drop in volume and distortion of timbre. There were various drawbacks such as inability to
produce an effective sound. The object of the present invention is to provide a thin, high-volume,
highly reliable electronic timepiece with a buzzer, which overcomes the drawbacks associated
with the above-mentioned conventional structure. The object of the present invention is to
achieve the above object by providing a convex portion on the imaging plate and holding the
imaging plate securely on the back cover provided with a projection provided on the chair cover.
An embodiment of the present invention will be described below based on the drawings. Y) 3 Fig.
2 shows one embodiment of electronic clock with buzzer according to the present invention g5.
It is a sectional view showing an example. The diaphragm 11 includes a plurality of projecting
portions 12 b formed of, for example, a plastic material covering the module 6 in addition to the
projecting portions 11 b that abut on the batteries 9 and 9 ? ? (a plurality of projecting
portions 12 b formed in the vicinity of the battery And a plurality of convex portions 11C held by
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The device cover 12 is fixed to the module 6 by several pieces (not shown). The battery 9 is
pushed up to the side of the back cover 2 by the force of the battery receiving spring 10, and
holds the projection 11 b of the diaphragm 11 with the back cover 2. (3 ░) 933, that is, in the
present structure, the photographing plate 11 has a back cover 2 and a plurality of projecting
portions 12b1 of a back cover 2 and a back cover 2 and a device cover 12 and an outer
peripheral portion 2a of the back cover 2 and a case It is clamped and fixed by the backing 7
inserted in the. Moreover, since the space region 16 is provided on the module 3 side of the
projecting portion 12 b of the device cover 12 so as to be able to elastically deform, it becomes
? to be able to absorb variations in the processing accuracy of the component parts There is.
Even if a gap is generated between the back cover 2 and the diaphragm 11 or a contact of one
side 1l-1V or the like occurs, the convex portion 11C located near the vicinity of the battery 9
and the projection 12b of the device cover 12 Because the diaphragm 11 is securely held and
fixed, the reduction in volume and the distortion of timbre can be removed.
Also, when the loudness was measured using the conventional example and the present example,
the average volume when measuring 20 samples in the former was 2 ░ -68, 9 (dB), and in the
latter, the father, = 75.9. (DB) and the difference is 7. A big difference was confirmed with Q (dB).
As for the variation, when the standard deviations of 20 samples are totaled (6) 3 C, the former is
smaller than ? 2 217 and the latter is smaller as ? ? 156. FIG. 3 is a plan view schematically
showing a diaphragm 11 which is an embodiment of FIG. In the present embodiment, the three
convex portions 11C 111 d and 11 e of the diaphragm 11 are held by the three projecting
portions (not shown) of the device cover. However, the convex portions 11 C to 11 e are flat near
the battery. Vibration between the battery and the piezoelectric element 5) J plate 11 part,
sandwiching the projections 11C to 11e with the back cover and the projection of the device
cover By doing this, the vibration of the diaphragm 11 can be made to resonate in the space
enclosed by the back cover 2 and the diaphragm 11, or it can be brought closer to the resonance
state, and the volume can be further increased or a better tone can be obtained. it can. FIG. 4 is
another embodiment of the present invention, and FIG. 5 is still another embodiment of the
present invention. In the plan view of FIG. 4, the diaphragm 11A has a semicircular arc shaped
convex portion 11f formed in the vicinity of the convex portion 11b drawn for the battery, and
FIGS. Similar to the embodiment shown in the figure, in this embodiment as well, a protrusion
(not shown) is formed on a portion of the device cover corresponding to the protrusion 11f. The
projection 11f is configured to be held on the back cover side. In the plan view of FIG. 5, the
diaphragm 11B covers the vicinity of the outer periphery of the convex portion 11b which has
been drawn for battery use in a planar manner 61J 77 shaped 0 convex portion 11g "formed and
19 'voiced, this convex portion Device cover corresponding to 11g-) Y. и Ring-shaped protrusion
(not shown) formed on the part. V is configured to hold the convex portion 11g on the back lid
side. In this embodiment, the structure in which the battery is pushed up to the back lid side by
the pressing force of the battery receiving spring and abuts against the battery diaphragm is
described. However, the present invention is not limited to any battery receiving spring Instead,
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for example, an electrode pattern is formed on a circuit board as another embodiment, and the
circuit board portion on which the electrode pattern is formed is made elastic to push up the
battery to the back lid side, with the same effect. is there. (8) As described in 38 or more (in the
present embodiment, a projection is provided on a part of the diaphragm conventionally used,
and the projection and the back cover provided on the device cover are securely held and fixed)
It is possible to provide a highly reliable electronic watch with a buzzer which has a large volume,
clear timbre and high reliability.
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