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DESCRIPTION JPS4880287

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DESCRIPTION JPS4880287
January 28, 1972 Patent Office Ikan Tokuhisa Flinaga 1, name of invention ■ JP-A-48-80287
Office serial number 1o Japanese classification is also 924.4 ji /// 8 / 毫 箋 1 'statement Title of
the Invention Title of the Invention Curved Piezoelectric Element
Curved piezoelectric element [phase] Japan Patent Office published patent publication
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a folded
piezoelectric element, and it is an object of the present invention to obtain a large folded output.
Fang 1 shows a conventional curved piezoelectric element, and 1 and 2 are piezoelectric
members bonded together with a center electrode 5 interposed therebetween, and are polarized
in the direction of the arrow. 4. One end of the bimorph constructed in this way is fixed in a
cantilevered manner, and an electrode is affixed to the outer surface. When a voltage V is applied
between the 、 5 and the center electrode via the terminals T, T, one of the piezoelectric bodies
1, 2 expands and the other shortens, resulting in a curvature in the bimorph. The shortening
amount of the piezoelectric body 1 and the expansion amount 1Δ101 of the piezoelectric body
2p have their original lengths! . Assuming that 1Δ1 oI = lod3. v / Co · · · · ■. Where d31 is a
piezoelectric coefficient, co is a thickness of each piezoelectric body 1.2, and ρ is a flat curvature
□ radius of a bimorph curved in a 5 ° arc shape. , The central angle. Then, for the piezoelectric
body 2 (ρ. +3−>s。 -16 + io's + v / a0HHH ++. For the piezoelectric body 1, 15 (1) o2) j'o =
10 lo's + v / coHHH ++. From these two equations, こ の o 1 m. If you ask for, QO & EndPage: 1
will be. The displacement amount Δy of the free end due to bending is lOΔy 1 − (1 ′ ′) when
0 is substituted into the equation (1). As an example, if zo = 1 o- '(m), 0 o = Fl (1-' (m), d, + -10-12
(c / N), V = 102 (V), then 100 μ in ΔL . The present invention aims at dramatically increasing
such slight displacements. FIG. 2 shows a bimorph used in the present invention. In this example,
the piezoelectric material l /, 2 /, and the piezoelectric 7 have a corrugated cross section formed
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by connecting semicircles. The figure shows a portion of the waveform bimorph 6, ie, a portion A
corresponding to the positive half of the waveform. A represents the shape before deformation,
and when the average radius is α and the thickness of each piezoelectric body 1 ′, 2 ′ is
11.12, the voltage V is applied to generate The amount of expansion and contraction of the
piezoelectric members 1 ′ and 2 ′ is Δ11. If it is set as (DELTA) 12, it will be (DELTA) 11/1 ld3 Iv / C ..-.. (DELTA) 12/122 d31 v / C. By this expansion and contraction, the semicircle A
shown in a is deformed into a fan shape as shown in the mouth. When the radius of curvature
after deformation is R1, the central angle is Da. These two equations are obtained. Let r be the P
/ Q / of one bite, r / 2 = R story y! Since it is 1/2, the radial extension Δr is
Δr−p′Q′−pQNr−2 ayz 21 (B56 / 22α, because it is π / 2 in 91⁄2, one late ΔΔ in 1 172
Δτ 2R-2a in the middle ... [F] and demon.
In this equation, the above-mentioned equation 0 is obtained, and further, {circle over (1)}, {circle
over (1)}, {circle over (1)} and {circle over (1)} are substituted. The semicircular portions B and D
are polarized in the opposite direction to the semicircular portions A and O. That is, in the
piezoelectric body 1-2 ', the inflection points E, F, G, and H are i and the polarization direction is
reversed. As a result, the polarization directions are indicated by arrows and marks. The
semicircular portions A, B, O, D are directed outward. Therefore, when the piezoelectric body 2 'is
expanded in C and the piezoelectric body 1' is shortened in the semicircular portion, in the
semicircular portions B and D, the piezoelectric body 1'i is expanded in the opposite manner.
'Will shorten. The radius of curvature of the semicircular portion 'A, 0 is increased at the gap
where the radius of curvature is increased, and also at the semicircular portion B,]). After all, the
waveform bimorph 6 indicated by the solid line in FIG. 2 extends as indicated by the dashed line
7, and is shortened as indicated by the dashed line g when the polarity of the voltage V is
reversed. The amount of expansion or contraction Δl is obtained by multiplying the amount of
expansion or contraction Δr of the semicircular portion A by the number n of connected
semicircles or c ′, and 2αn = 1 (t is the total length of the bimorph 6) Since this is transformed
into a1-one 31VEndPage: 2, when this equation is divided by the equation (2) of the expansion
amount Δlo of the single piezoelectric body 1, 2, in order to make the conditions equal, If l-1 o
Qv = th-Qo, then Δ! o0となる。 Assuming that the thickness 0 of the piezoelectric body
1/2/10 is 10-'m, and the radius α of the semicircle is 5 × 10 ′ ′ 3 m, that is, the expansion
amount Δl of the waveform bimol 76 is the expansion amount 4100100 of the piezoelectric
body 1 or 2 alone. The doubled fang 4 doubles with the wave bimorph 6 configured as described
above bonded and fixed with the head x, y, z of each wave and the expansion and contraction are
reversed. It shows a piezoelectric element configured. The displacement .DELTA.y2 at the free
end of the piezoelectric element is dramatically larger than the displacement .DELTA.y1 of the
conventional piezoelectric element shown in FIG. It will be big. This is the same as the one shown
in Fig. 1 and the total Δ! l、lo2dssv/’o”! Substituting =-7 o 10-co, Δ y, IP ', ie,
according to the embodiment of the present invention, a displacement of 50 times that of the
conventional one can be obtained. Fang 5 shows the relationship between the polarization
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direction of the piezoelectric body 1121 and how to apply an applied voltage. In the case of B,
four external electrodes 9, 10, 11.12 are used as terminals T, , Two internal electrodes 15.. , 114
are connected to the terminal T3, respectively, and both terminals T3.
T, apply a voltage between. In the case of the mouth, the external surface type # 9.1 ° and the
internal electrode Ill are connected to the terminal T, and the external surface electrodes 11 and
12 and the internal electrode 1 are connected to the terminal T6. In either case, the upper and
lower waveform bimorphs expand and contract in opposite directions, resulting in bending. In
the above embodiment, the case where the waveform bimorph 6 is formed as a continuous
semicircular waveform is shown for the sake of description and calculation, but this waveform
may be a sine wave or any other waveform. It is also good. As described above, according to the
present invention, two piezoelectric materials are laminated to form a pie-morph t-form, which is
formed into a waveform, and the polarization directions of its positive half-wave portion and
negative half-wave portion are The two waveform bimorphs expand and contract so that the two
waveform bimorphs fix each other at their wave fronts, and one of the waveform bimorphs is the
opposite of the other waveform bars or imorphs. Since the bimorph is constructed by deforming,
that is, by two corrugated bimorphs, an extremely large bending displacement can be obtained.
4. Brief description of the drawings 1 Fig. Is a side view of a conventional folded piezoelectric
element, Fig. 2 is a side view of a wave bimorph, Fig. 49 is an enlarged side view of a part of a
wave bimorph, fang 4 FIG. 5 is a side view of a curved piezoelectric element according to the
present invention, FIG. 5B is a side view of a part of the curved piezoelectric element according to
the present invention. EndPage: 31 /, 2 / ... Piezoelectric, 6 ... waveform bimorph, A, O: positive
half wave portion, B, D ... negative half wave portion, x, y, z · · ·・ ・ The part of the wave front.
EndPage: 4 (1) Inventors Address 3-12, 12 Moriya-cho, Yokohama-shi, Kanagawa-ken Name in
Japan Victor Co., Ltd. Name i Musamu Address Address in the same place Name Shingo Miyajima
Address with the name Hideo Toiyama (2) Agent Address Tokyo Metropolitan Government Ginza
8-chome 12-15 National Fuel Hall 709 Room JP-A 48-802 117 (5) · Patent Office Director
General Yukio Miyake 1, Display of the Case 1972 Patent Application No. 10403 No. 2, name of
the invention 2. Name of the Invention Curved Piezoelectric Element 3, Related Patenter Address
with Person who Makes Corrections Address (Location) Kanagawa-shi Yokohama-shi, Yokohamashi, Yokohama-shi, for 3 wards of Moriya-cho, 12 Address Name (Name) (432) Japan Bic □ 'ter
Co., Ltd. '4, agent 〒 104 address Tokyo Metropolitan Ginza 8-chome 12-15, Chuo-ku Tokyo
National Fuel Hall 709! Name (5664) Patent Attorney Tomoki Araki, Aid, (1 person) 6 Contents
of correction (1) * Correct the scope of the claim according to the attached sheet. (The “1
Δtol” tod, v / C 0 ”in the 211 JA book 2nd row 8th line is corrected as a crying Δz, l =
Llodash / CoIJ. (3) "(矛 0〕-φ o" to + 1 ud, IV / C 6 J, "(矛. +-) Φ. It corrects with = 444'Od, and V
/ 2CoJ. (4) Same line 2 pages 15 lines "((。. -One) φ. = 10-to dss V / C 0 "," (。. -One] φ. It
corrects as /,-, d, V / 2CoJ. (5) Same, 1? Two-page 17-line [p. Correct "2d, V 'as" A = rubble ". (6)
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The same second contradiction 18 lines "φ. = Correct the soil d, vJ with O 2 O “φ o = a 81 vJ.
C, '1 o 21 o 1 o' (7) 'd in [Delta] Ys, v = Co' d3. VJ 2 C, a (8) “Ay, 100 μm in” on page 6, line 9
is corrected to “Δy, 50 50 μ”. (9) Same line 4 pages 7 lines “Δ ls / l! s = dssv / CJ, “Δ / s /
7i = dalV / 2CJ color correction. [0199] Correct “Δlt / it = ds + V / CJ in the same way on 4
lines and 8 lines as [Δm / l * = dash / 2 CJ.
EndPage: 5-2d, v, JC hot. 1-d □ VCVCQ1lI オ 7 page 1a2 line (1) I-d31 V << 1'IInd3. “v << 2” /
dAIVJ is corrected to “2 d, v << '1, nd 34 V ′ <(− (t C” 2 l ds + V J. C! (In the same manner,
correct the [Δl binary 1 ds + VJ to [Δl quini / dat VJ. C-containing +22) Correct “100 J gold,“
5 o ”on page 1, line 8, page 3. @ Correct the “waveform” on page 3/5 on page 8 with “one
set of waveforms”. (24) Delete the "two pieces" of the six rows of the same 8th row. (29) Correct
"50" in the 6th line of page 9 with "25j". (30) Correct “2 sheets” in the 9th row, 8 lines and 11
lines of the same page as “1 set”. EndPage: 6
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