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Description 1 and title of the invention Sounding device for a watch (1) In a reporting device in
which a transparent piezoelectric element is disposed on a translucent member such as a cover
glass of a watch, an optical display panel substrate, reflection on at least one side of the
transparent piezoelectric element A watch sounder characterized by having a prevention I, a
penetration f, and a degree equal to that. (2) Between the transparent piezoelectric element and
the light transmitting member, as a reflection preventing layer, a refractive index of 1,85 to z61.
A ranger according to claim 1.
2, the scope of claims
5. Detailed Description of the Invention The present invention relates to a piezoelectric sound
generator for a watch such as a next watch, which is formed by arranging a transparent
piezoelectric element on a translucent member such as an optical display panel substrate such as
a cover glass or a liquid crystal panel. The electromagnetic type and the piezoelectric type are
broadly classified as those put into practical use as the watch report 'fa. The piezoelectric type
has come to be widely used because of its simple structure and thinness, and its waterproof
structure. If there is a transparent piezoelectric element, various effects can be expected if it is
bonded to a cover glass to form a horn. That is, since it is only necessary to position the
piezoelectric element below the cover glass etc., the structure is simple and it is easy to make it
thin. Since there is no intruding part such as water caused by the alarm, it is easy to make a
waterproof structure. The cover glass vibrates in unison with the piezoelectric element, and the
vibrating part is directly directed to the outside air, resulting in a muffled noise. ない。 It is
possible to increase the sound pressure to a stir that can be made the same area as the
piezoelectric element / cover glass. In order to obtain a large sound pressure, it is also possible to
make the frequency characteristic sound flat and make a broadband sounding device as a result
of lowering the degree of the whole of the whole of the lively board altogether. It makes it easy to
apply it to an analog watch by making use of the characteristic sound of a transparent sound
detector, and also covers women's watches that were previously impossible to set up the sound
detector completely in a small size. By using the whole glass, it becomes possible to install all the
horns. However, the transparent piezoelectric elements currently known have a large index of 1
PLZT1 and all of them have a refractive index of about 2.5 and reflection loss on one side is (n-1)
′ ′ / (n + 1 is α 19 Then it will be over 30%. For this reason, is it transparent by bonding a
transparent piezoelectric element to a cover glass? At the time of forming, this large reflection
loss becomes a serious problem, and as it is, it is not necessary at present. An object of the
present invention is to reduce the reflection loss inherent to the transparent piezoelectric
element as described above, to increase the transmission ft and the power, and to provide a
transparent meter that can be practically used as a clock and monthly report. That is, the lower
side of the cover glass with a transparent piezoelectric element. When mounted on one side of a
liquid crystal panel substrate to form a watch light source, one or two or more layers of antireflection film are used to prevent total reflection at the interface between the cover glass etc.
and the transparent piezoelectric element Or one or more anti-reflection films are formed on the
lower side of the transparent piezoelectric element.
By doing this, it is possible to prevent a large surface reflection of the element by the transparent
pressure, and the device becomes a transparent piezoelectric report. The conceptual diagram in
the case of 1)-of the anti-reflective film in the interface of a transparent piezoelectric element, a
cover glass etc. is shown in all FIG. 1 is a cover glass such as organic glass, inorganic glass,
sapphire glass, etc., and its refractive index is about 1.5. 5 is a transparent piezoelectric element,
and 2 is an antireflective film. 2 can be used also as an electrode of a transparent electrode.
Assuming that n, l, n, nl are all n, l, n, nl in this 1,2.5 refracting army, the forcing of the reflection
becomes the smallest around n = 5, and in this case n is effective in the range from 1.85 to z5 Is
large. With regard to the thickness 9 of 2, when the wavelength of light to be antireflective is set
to be around 5500 angstrom where visible light is high in visibility, and the optical thickness is
entirely in the range of 700 to 1,200 angstrom, the antireflective effect is large. Since the optical
thickness is equivalent to the thickness of the eyelid and multiplied by refraction, the actual
thickness is as thin as possible. Fig. 2 shows a conceptual diagram in the case of 2 bits. 4 is a
hippo 5-glass, 7 is a transparent pressure! The element 5.6 is an antireflective film. Are these 4
to 7 refractive indices "4 + rl @ * nl 1" respectively? In this case, reflection is minimized at n: n, =
n: n. n4 is about 1.5. Since n is approximately 2.5, it is also used as an electrode of 6 totally
transparent piezoelectric elements, n 6 is 1.85 to 2.3, n is 1, 55 to 1.8, and the optical thickness
1700 of each. When it is tossed to 1200 angstroms, the anti-reflection effect is large. A
transparent conductive film having a refractive index of 1.9 is shown in FIG. (Indium oxide + tin
oxide) original science I 1oo. The graph of the result of the numerical calculation by a theoretical
formula with respect to the wavelength of light with respect to the reflectance when forming an
angstrom is shown. FIG. 4 shows a similar graph with an optical thickness of vi72000 angstrom.
In FIG. 5, the refractive index 2-2, for example a film of tin oxide and the refractive index 1.7, for
example Y! 0. The respective films have an optical thickness of 11,000, and reflectivities when
they are used. It can be seen that the reflectance decreases most when two layers are used. In the
anti-reflection film on the lower side of the transparent piezoelectric element, it can be
considered in the same manner as in the case of n +, n, f1.0 in FIGS. 1 and 6-EndPage: 2. In the
case of one layer, if the refractive index is set to 185 to 2.3 and the optical thickness is set to 700
to 1200 angstroms, the reflectance is lowered. In the case of 2 舊, it is also used as a 1-full
electrode on the transparent piezoelectric element side, and its refractive half is made 1.9 to 225, and outer half layers are made to be refractive half 163 to 1.5. If it is set to 1200 angstroms,
the anti-reflection effect is large.
FIG. 6 shows a refractive index of 1.9, for example, a reflectance when the transparent
conductive film of ITO is made to have an optical thickness of 1000 angstroms. In FIG. 7, a
refractive index of 2-2, for example, a transparent conductive film of the above-mentioned tin
oxide and a refractive index of 1.3, for example, a film of magnesium fluoride are formed, and a
reflective film is deposited upon recollection. An example of the anti-reflection film at the above
24 degrees is described, and 9 may be made into more layers. However, in this case, since it is
necessary to take into account the loss in the film, it is not simply that the number should be
simply 1-. As described above, since the refractive index of the transparent piezoelectric element
is increased, it is possible to reduce the surface reflection of about 30% or more to a surface
reflection of about 30% or more, and form it on the cover glass. It will have excellent ratio
characteristics as a transparent piezoelectric piezoelectric sounder. As a transparent piezoelectric
element, titanic acid and zirconic acid. PLZT in which lanthanum is added to lead is typical. PLZT
used in the present invention is (Pb1-xLhx) (ZryTi, -y) + king 03 and X is [1L04-α14. y is in the
range of 135 to α70. When X is α04 or less, the light transmittance is not sufficient, and when
X is 014 or more, the Curie temperature becomes room temperature or less, and the
piezoelectricity is lost in the paraelectric. When y is [135 or less, the piezoelectric property is not
sufficient, when y is 170 or more, it becomes an antiferroelectric material, the piezoelectric
characteristics are bad and poor, and in the trigonal system ferroelectric material, the electrooptical scattering effect is large. , Translucency worsens. ストロンチウム、バリウム、ニオブ、ビ
スマス。 Since samarium, neodymium, lithium and the like are elements that help light
transmission, it is also effective to add to PLZT or to replace some of them to improve light
transmission and piezoelectricity. The transparent piezoelectric element is manufactured by a
ceramic method such as a hot press. This is cut and mirror polished to 50 to 500 microns for
use. It is needless to say that the thinner the thickness, the more advantageous because the
original scattering inside the transparent piezoelectric element is proportional to the thickness.
As the transparent conductive film, a refractive index of about 2.2 or a refractive index of about
1.9 is used. As the substance having a refractive index of 1.5 or less, MgF 2 or the like is used,
and the substance at 1.6 to 2.01 is E310. A40.。 OeF, Th02, La, o, sb, o, y, os, etc. may be
used alone or in combination. If a conventional glass coating is used on the surface side of the
glass, the reflection on this portion is reduced, which is useful for the same as the overall
Besides, as a method of making a transparent piezoelectric element, the transparent piezoelectric
element may be attached to the light transmitting member by vapor deposition, tin plating, or the
like. In addition, as a formation method of the said anti-reflective film, vapor deposition, 0VD
(chemical vapor deposition), and sputtering. The spraying method etc. are used. The crosssectional view when the transparent piezoelectric element is joined to the glass-glass 9-laser and
incorporated into the watch case is shown in FIG. A cover glass, 2 is a transparent piezoelectric
element provided with an anti-reflection film, 3 is a cylinder, and 4 is a packing. As described
above, the reflection loss can be reduced by 30 to several tens by reducing the number of
reflections by positioning the transparent piezoelectric element on the lower side of the cover
glass of the entire watch, and the clock sound It can be put to practical use as a container and
can provide a watch with high product value. The same method applies to bonding not only to
the cover glass of a watch but also to an optical display panel, such as a liquid crystal panel, a
substrate such as an electrochromic substrate, or an analog or digital transparent cut-out plate. it
4. Brief Description of the Drawings FIG. 1 is a conceptual view in the case of one layer of antireflection at the interface between the cover glass and the transparent piezoelectric element. 1 is
a cover glass, 2 is an antireflective film, and 3 is a transparent piezoelectric element. FIG. 2 is a
conceptual diagram N1-EndPage: 3 in the case of two layers, 4 is a cover glass, 5.6 is an
antireflective layer, and 7 is a transparent piezoelectric element. FIG. 3 is a graph of the
reflectance with respect to the original wavelength when a transparent conductive film having a
refractive index of 1.9 is formed to an original thickness of 1000 angstroms. FIG. 4 is a graph in
which the original thickness is 2000 Å under the conditions of FIG. The fifth factor indicates the
smell when the refractive index is 42.2, and the reflectance when the film with a refractive index
of 1.7 has an original thickness of 11,000 angstroms. Fig. 6 and Fig. 7 show the reflectance when
the outside is an air layer, and Fig. 6 shows the reflectance when a film with a refractive index of
1.9 is formed to a thickness of 1000 angstroms, FIG. 7 shows the reflectance at the time of
forming an original thickness of 1000 angstroms for each of gold having a refractive index of 2.2
and 15 respectively. Fig. 8 shows a sectional view of the case where the sounding device is
incorporated in the case. 1 is a cover glass, 2 antireflective layers on both sides, constant
transparency pressure! The element 6 is a cylinder, and 4 is a patch. 11-Haruka (C Nell) sugar
five diagram circulation 1 [swords and ー ー ー ー ー ((unque ヰ い −) 幕 幕 ((η η 七 七 (b 7))
EndPage: 4 JP 5 G-6186 (5) Amendment of Procedure (Spontaneous) Patent Secretary General 1
Case 1 Shown 1, 昭和, '' Application No. 81611 +; 2 Title of Invention 2 Name of Invention Alarm
tone generator 3 Person who makes corrections Case and related applicant Ginza 4-chome 5-4
(Chuo-ku, Tokyo, Japan) Waka representative leisure director Tsuneya Nakamura 5, number of
inventions increased by correction EndPage: 5
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