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DESCRIPTION JPS57160199
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1: Back pig drive type piezoelectric buzzer of
conventional structure. Fig. 2: Drive circuit flying over the boost coil. FIG. 3: Frequency
characteristics when the back pig type piezoelectric buzzer of the conventional structure is
driven by a drive circuit using a booster coil shown in FIG. Here, ■ is a free state, ■ is a mobile
state. Fourth N: An embodiment of a back pig driving type piezoelectric buzzer according to the
structure of the present invention. FIG. 5: An enlarged view of a piezoelectric element and a metal
diaphragm adhesion fixing part. Here, a is a conventional structure, b is a structure according to
the present invention. FIG. 6: Frequency characteristics when the back pig driving type
piezoelectric buzzer according to the structure of the present invention is driven by a driving
circuit using a booster coil shown in FIG. Here, ■ is a free state, ■ is a mobile state. Fig. 7
Another embodiment according to the present invention (fixing the back pig and the metal
diaphragm by welding at a plurality of places). Here, a figure is a plan view seen from the
piezoelectric element side, and b figure is an enlarged cross-sectional view of a welding fixing
portion. Fig. 8: Frequency characteristics when the conventional rear pig driving type
piezoelectric buzzer is driven directly. Here, ■ is a free state, ■ is a mobile state. Fig. 9:
Frequency characteristics when the back pig driving type piezoelectric buzzer of the present
invention is directly driven. Here, ■ is a free state, ■ is a mobile state. Here, 1 · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · watch movement, 4 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · watch movement, 4 · · · contact spring, 5 · · · Patzkin, 6 · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · Piezoelectric buzzer, 9 · · · · boost coil, 10 · · · · · · transistor, 11 ······
Metal diaphragm, 12 ······ Adhesive bonding part, 13 ······ Welding fixing part.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
structure for an electronic watch, and in particular, in the type of piezoelectric rubber for driving
a back pig, its frequency characteristics are remodeled to improve the volume level, the volume
The present invention relates to a piezoelectric structure that can be used as a level pate (as well
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as a metal plate). A conventional structure example of a piezoelectric buzzer of a type driving a
back pig (hereinafter referred to as a back pig driving 飄 piezoelectric buzzer) shown in FIG. 1 is
a piezoelectric element 1 in FIG. When an electric signal from the 0 watch movement 3 is guided
to the piezoelectric element through the contact spring 4, the piezoelectric element expands and
contracts, and the base metal of the bimetal bends and vibrates the back pig to generate a sound.
In addition, as a drive circuit, a case where an electric signal is directly applied from the hour
hand IO to a piezoelectric buzzer (a device in which the piezoelectric element and the back pig
are adhered and fixed is called a piezoelectric buzzer) and a piezoelectric buzzer as shown in FIG.
There is a drive circuit a) that applies a high voltage to the pressure d by a self-induction voltage
of the boost coil. Consider the drive circuit shown in FIG. 2 using a boost coil used in the
piezoelectric pump. FIG. 5 shows the frequency characteristics when this drive circuit is used. W
1 shows the frequency characteristics of the case where the watch is not carried by the arm
(when the skin of the arm 2 is not in contact with the back pig, hereinafter referred to as the free
state), and in summer the hour hand is carried by the arm If you are doing (the condition that the
skin of the arm and the back pig have scored)-and later! It shows the frequency characteristics of
lI bone-like swelling. Mu is a back pig resonance point in the free state, and is stunned. ム̶、ム
４． ...... arm prone in addition to 2f of fl as harmonic components (drive # the driving waveform
shoulders wavenumber t1 seven 7-Rie series component with the driving waveform @ mV'se'f, ···
... with a component of% t, it is a peak which appears in ilTe 7 ′ ′ ′ ′-M of the back pig at
1111 vibration frequency, and f is the resonance point of the back pig in the portable state, ..,
M.... M.sub.1 is a peak in the T, N bow "" s "of the back pig resonance number in the free state
and 1111 as well. As can be seen by comparing two frequency time X, summer, ˜ (1) 1193, in the
m band, unlike the free state, the vibration of the back pig is suppressed by the arm and both the
resonance level and the resonance local wave number Go down. Therefore, in order to obtain
substantially the same volume level even in the free state and in the portable state, the back pig
shape is determined such that the drive frequency is in the vicinity of the frequency X at which
both of the frequency characteristics show the same volume level.
However, even in the portable state, the frequency characteristic is nectarized by the portable
strength, and in consideration of the variation of the back pig support portion or the back pig
board thickness, regardless of the port strength and in all the pins, The volume level of the
mobile state and the mobile state are not necessarily the same level, and the volume level is
uneven and unstable. The back pig driving source piezoelectric buzzer has a simple structure, low
cost, no design restrictions, and excellent waterproof and pressure resistance as shown in FIG. It
is expected that this volume level instability, S / 's (4) 1 λ p 4, as it will be widely used. The
solution is being raised as an important point. The present invention solves such a defect by
setting the frequency characteristic to 7ty) by installing a new metal diaphragm の 他 in addition
to the back pig, and the back pig 保 つ which keeps the volume level stable in the free state and
the mobile state. Recommendation We propose a piezoelectric buzzer structure. The present
invention will be described in detail according to wJIii. FIG. 6 is an embodiment of the present
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invention. Do not attach the piezoelectric element directly to the back pig (the piezoelectric
element is attached to the metal plate 11 and this piezoelectric element is attached to the metal
diaphragm at the outer periphery of the metal plate) It is a point that The enlarged view of the
conventional structure and the bonded portion of one embodiment of the present invention is
shown in FIG. J115, FIG. 6 shows the conventional structure, and FIG. 1 shows the structure of
the present invention. According to the structure of the present invention, the expansion and
contraction vibration of the piezoelectric element does not cause the back pig to bend and
vibrate directly (first, the metal diaphragm is bent and vibrated, and the bending vibration of the
metal diaphragm is transmitted to the back pig It will be insulting to vibrate, so it will be a
diaphragm according to the structure of this note] (5) 1195; Two plates, the moving plate and
the pig, possess resonance points for the metal diaphragm and the pig. Needless to say, how to
adhesively fix the metal diaphragm to the back pig, for example, when a part of the outer
periphery of the gold jI diaphragm is adhesively fixed, when the adhesive width port shown in
FIG. Even when the shape of the plate is changed, it is a part of the present invention, and
although the resonance frequency of the gold iI4 diaphragm is different in each case, the
resonance frequency of the metal diaphragm is lower here than the resonance frequency of the
back pig. The frequency characteristics of the "own" structure are shown in Fig. 6. The 0 plate is
the frequency characteristic of the 7-inch intestine, and B8 is the resonance point SO of the back
pig is the resonance point of the metal diaphragm. ... 1 circuited conventional 4 # granulation
frequency characteristic sixth back ivy co myii1111 wave number i to have the same driving
waveform harmonics in the case shown in FIG, -j, -4 ....・ ・ ・ It is a peak appearing in i.
In addition, 'ms'a + ·········· Os is also a peak appearing at TTI ······ i of the co-first-line frequency of
the metal diaphragm, as shown in this frequency characteristic l コ H When comparing the
frequency characteristics I, although the back-up becomes large due to the decrease of the
frequency characteristics I) (II) 11 嶋 C evening resonance point level is lowered, the resonance
points a1 and − of the metal diaphragm to be newly released 0, 0 ° ... · · · · · · · · · · frequency
characteristics become very 7 ratt by Qvh 0 next to the frequency characteristics in the mobile
state T, where d @ here! l't, 11 ',------dn are the resonance frequency of the back pig and the peak
that appears at the-, 0' @@ fH, @ O '@ g. The resonance frequency of the plate and its peak. As
shown by this frequency characteristic, the band is wider than the frequency characteristic of the
conventional portable state as in the free state, and the change from the free state of the back pig
resonance point to the portable state (m. The change from the free state to the portable state (0,
→ g) of the resonance point of the metal diaphragm compared to = 's) is small, so the resonance
frequency of the metal diaphragm is in the vicinity of the drive frequency (for example 4ap 4mg)
If it is set, it can be combined with the 7 characteristics of frequency characteristics, and even in
the portable state, it is possible to secure more stable and high sound pressure level than the
conventional structure. By taking the structure according to the present invention, not only the
simple error but also the 7 characteristics of the frequency response are utilized. It can be used
enough for 7 ° melody. Fig. 7 shows another embodiment of the present invention. Instead of
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bonding and fixing, welding in multiple places and back pig and gold I4t! The ji moving plate is
fixed. FIG. 7-s is a plan view seen from the piezoelectric element side, and% II 7 -Am is an
enlarged sectional view of the SaW constant portion. As described above, the present invention
has considered the drive circuit using the booster coil shown at ll12g as the drive circuit
described above, but also in the case where an electrical signal is directly applied to the
piezoelectric buzzer from the clock IO (hereinafter referred to as direct drive) Similar effects can
be obtained. 蕗 IIwi shows the frequency characteristics when the conventional structure is
directly driven. (1) shows the frequency characteristics of 7 cycles, DIG: hog pig resonance
frequency% "II" 1 is a peak that appears at i, -5 of the rear pig cop # 1 speed, boost coil There is
no peak at the point of '2'4 ... i of the resonance frequency and the even number 01 as in the case
of driving using This is because a rectangular wave having no even component of D is 1 and this
rectangular wave is applied to the pulse 11a-J (') 198LL,' 1.
The symbol {circle over (2)} indicates the frequency characteristic of the portable state, and the
same resonance frequency as that of the 7-reed cage is the resonance frequency V, and that i,
1.2% -1 v point go ,, V,. And s- □. On the other hand, pg shows the frequency characteristic when
the piezoelectric buzzer of the structure according to the present invention is directly driven. W
is in the free state, and the bag is in the portable state. W's "S #" * e "@ a" "−1, -1 is the back
resonance frequency and its i, i ········································································· 18% -8 is the resonance
frequency of the metal diaphragm and its peak at -s, ... 1iT. ■ l'1. ll 'agriculture, yl, --- x', y ', y', --fj,-, 11 & 11 respectively "ll" l * m, + t "as-xs and '5 oyas The peak that occurs in the portable
state corresponding to "" "" as-s. As can be seen by comparing FIG. 8 with @ 9, i, 7. of the
resonant frequency of the back pig and the metal diaphragm. The peak of the frequency
characteristics is 1! By using the structure of the present invention as in the case of driving using
the booster coil although there is no peak in the fifth and even parts. F Castle is wide 1 ・ 4! One
thousand metal vibration "0" resonance, ae7! ｌ−０−）１１．３９．。 The change from the
state to the tl # l band (11 → y /,) is smaller than the change in the back resonance point (1, →
11). Therefore, the resonance frequency of the metal diaphragm is set near the drive frequency.
Thus, direct drive, which is difficult to realize in the conventional structure, can also be stomach
function by using the present invention. One or more structures of the present invention that are
gastric power become very effective even in the case of direct drive. Next, in taking the structure
of the present invention, let us consider factors that are considered disadvantageous as
compared with the conventional structure (: I strike, watch thickness). Considering the cost first,
the factors that increase the cost compared to the conventional structure by adopting the
structure of the present invention are that the number of metal diaphragms is increased by one
and that the process of bonding is increased by one. Since the metal diaphragm is obtained by
simple press punching, most of the cost is material cost, or the rate at which the process is
included in the overall buzzer cost is small and the degree of cost increase is low. It is considered
that, by making the construction, the tolerance range of the back pig tolerance can be taken
large, and the total bus =, 11 ′ ′ 1200 ′ ′ cost becomes cheaper due to the improvement of
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−r. On the other hand, with regard to watch thickness, the thickness of this metal diaphragm is
as thin as L1 to a2 and it hardly causes any problem as a watch thickness, 11) by attaching the
metal diaphragm to the back pig , Substantial back pig thickness is the thickness of the metal
diaphragm (for example, back pig thickness a-image metal diaphragm thickness 12 mm
substantially back squirt thickness 18 screen), pressure resistance flaws Considering that the
back tack thickness can be made thinner than conventional (for example, back pig thickness (L41 metal diaphragm thickness 12 ■, substantially back pig thickness a6 pieces) equivalent to the
metal diaphragm thickness, it is comprehensive Watch thickness does not change.
Back pig drive 考 案 piezoelectric buzzer by the present invention above. There is no difference
between the conventional and the conventional structure, and stable volume can be secured at a
higher volume level than that of the conventional structure, and there is also the utility value for
the use of medium, and the effect is practically large.
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