JPH058639B2 - - Google Patents
Info
- Publication number
- JPH058639B2 JPH058639B2 JP59214337A JP21433784A JPH058639B2 JP H058639 B2 JPH058639 B2 JP H058639B2 JP 59214337 A JP59214337 A JP 59214337A JP 21433784 A JP21433784 A JP 21433784A JP H058639 B2 JPH058639 B2 JP H058639B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric element
- silver
- nickel
- electrode
- electrodes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 31
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 19
- 229910052709 silver Inorganic materials 0.000 claims description 19
- 239000004332 silver Substances 0.000 claims description 19
- 229910052759 nickel Inorganic materials 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 6
- 238000000151 deposition Methods 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/87—Electrodes or interconnections, e.g. leads or terminals
- H10N30/877—Conductive materials
Landscapes
- Piezo-Electric Transducers For Audible Bands (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、アラーム時計の音源用振動子等に
用られる圧電素子に関し、特にその電極部の構造
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a piezoelectric element used in a sound source vibrator of an alarm clock, and more particularly to the structure of its electrode portion.
圧電素子は、圧力を加えると起電圧を生ずるた
め感圧素子として使用されるが、逆に交流電圧を
印加すると振動を起すため、振動子としても利用
される。
A piezoelectric element is used as a pressure-sensitive element because it generates an electromotive force when pressure is applied to it, but it also causes vibration when an alternating current voltage is applied to it, so it is also used as a vibrator.
このような、従来の圧電素子の構造は、一般に
第２図に示すように、例えばチタン酸バリウム等
の圧電材料を焼結したセラミツク板からなる圧電
素子本体１の両面に銀（Ag）ペーストを塗布し
て焼付け、銀電極２ａ，２ｂを形成していた。 As shown in FIG. 2, the structure of such a conventional piezoelectric element is generally such that silver (Ag) paste is applied to both sides of the piezoelectric element body 1, which is made of a ceramic plate made of sintered piezoelectric material such as barium titanate. The silver electrodes 2a and 2b were formed by coating and baking.
この銀電極２ａ，２ｂは、圧電素子本体１の表
面付近の焼結粒子間にも銀ペーストが浸透し、且
つ面方向の結合力が強いため、セラミツク板から
なる圧電素子本体１のもろさを補強して割れにく
くする役目も果している。 The silver electrodes 2a and 2b have silver paste that penetrates between the sintered particles near the surface of the piezoelectric element body 1, and have a strong bonding force in the plane direction, so they reinforce the fragility of the piezoelectric element body 1 made of a ceramic plate. It also plays a role in making it less likely to break.
しかしながら、このような従来の圧電素子は、
銀電極２ａ，２ｂの硬度が低いため、この電極に
接点端子等が摺接するような場合には、その部分
が削れてしまうという問題点があつた。
However, such conventional piezoelectric elements
Since the silver electrodes 2a and 2b have low hardness, there is a problem in that when a contact terminal or the like comes into sliding contact with these electrodes, that portion is scraped.
例えば、潜水者用の防水アラーム時計の裏蓋直
鳴り式アラーム音源用振動子としてこのような圧
電素子を使用する場合、第３図に示すように、時
計の裏蓋１１の内面に圧電素子１０を接着材１２
によつて貼着し、その裏蓋１１を胴１３にねじ込
む（防水の信頼性を高めるためにねじ込み式にす
る必要がある）。 For example, when such a piezoelectric element is used as a vibrator for an alarm sound source that sounds directly on the back cover of a waterproof alarm watch for divers, as shown in FIG. Glue 12
and screw the back cover 11 onto the case 13 (it is necessary to use a screw-in type in order to improve the reliability of waterproofing).
この時、モジユール１４から導出されたスプリ
ング状の接点端子１５に銀電極２ａが摺接しなが
ら、圧電素子１０が裏蓋１１と共に回転すること
になる。なお、第３図において１６はガラス、１
７，１８はシール用パツキンである。 At this time, the piezoelectric element 10 rotates together with the back cover 11 while the silver electrode 2a is in sliding contact with the spring-shaped contact terminal 15 led out from the module 14. In addition, in Fig. 3, 16 is glass, 1
7 and 18 are sealing gaskets.
このように、圧電素子１０の銀電極２ａ又は２
ｂに接点端子１５等が摺接すると、その摺接部分
の銀ペーストの焼付け層が削れてしまい、電極と
しての役目を充分に果すことができなくなる。 In this way, the silver electrode 2a or 2 of the piezoelectric element 10
If the contact terminal 15 or the like comes into sliding contact with b, the baked layer of silver paste on the sliding contact portion will be scraped off, making it impossible to fully fulfill its role as an electrode.
そうすると、モジユール１４から接点端子１５
及び裏蓋１１を介して圧電素子１０への高周波電
流の通電が、その全面に亘つて均一になされなく
なり、アラーム音が発生しないか発生しても不充
分なものになるという問題点があつた。 Then, from the module 14 to the contact terminal 15
Also, there was a problem in that the high frequency current was not uniformly applied to the piezoelectric element 10 through the back cover 11 over the entire surface, and the alarm sound was not generated or was insufficient. .
この発明は、このような従来の圧電素子におけ
る問題点を解決することを目的とする。 The object of the present invention is to solve these problems in conventional piezoelectric elements.
この発明による圧電素子は、上記の問題を解決
するため第１図に示すように、セラミツク板（例
えば円板状）からなる圧電素子本体１の両面に、
それぞれ銀（Ag）ペーストの焼付けによつて銀
電極２ａ，２ｂを形成し、その上にさらにニツケ
ル（Ni）を蒸着（イオンプレーテイングの場合
も含む）してニツケル電極３ａ，３ｂを形成した
ものである。なお、例えば銀電極２ａ，２ｂの膜
厚は7μ程度、ニツケル電極３ａ，３ｂの膜厚は
0.03〜0.4μ程度である。
In order to solve the above problem, the piezoelectric element according to the present invention has a piezoelectric element main body 1 made of a ceramic plate (for example, a disk shape) with a
Silver electrodes 2a and 2b are formed by baking silver (Ag) paste, and nickel electrodes 3a and 3b are formed by further vapor depositing nickel (Ni) (including the case of ion plating). It is. For example, the film thickness of the silver electrodes 2a, 2b is about 7μ, and the film thickness of the nickel electrodes 3a, 3b is about 7μ.
It is about 0.03 to 0.4μ.
銀ペースト（接着剤、ガラス等を含）の焼付け
層である銀電極２ａ，２ｂが、セラミツク板であ
る圧電素子本体１の横方向の結合力を強めて機械
的に保護する役目をしているため割れにくく、且
つ、ニツケルの蒸着層であるニツケル電極３ａ，
３ｂによつて電極表面の硬度を高めて電極表面を
削れにくくしている。
The silver electrodes 2a and 2b, which are baked layers of silver paste (including adhesive, glass, etc.), serve to mechanically protect the piezoelectric element body 1, which is a ceramic plate, by strengthening its lateral bonding force. The nickel electrode 3a is made of a vapor-deposited layer of nickel and is hard to break.
3b increases the hardness of the electrode surface and makes it difficult to scrape the electrode surface.
このような圧電素子を、第３図に示したような
防水アラーム時計のアラーム音源用振動子として
使用すれば、圧電素子１０を裏蓋１１に貼着する
際に水加圧力（例えば10Kg程度）を加えても割れ
ることがないので、圧電素子１０と裏蓋１１との
ま間に介在する接着剤１２の層を極めて薄くして
両者の密着度を高め、高周波電流の通電性及び振
動の伝播効率をよくすることができる。
If such a piezoelectric element is used as a vibrator for an alarm sound source of a waterproof alarm clock as shown in FIG. Therefore, the layer of adhesive 12 interposed between the piezoelectric element 10 and the back cover 11 is made extremely thin to increase the degree of adhesion between the two, thereby improving the conductivity of high-frequency current and the propagation of vibration. It can improve efficiency.
また、圧電素子１０を貼着した裏蓋１１を胴１
３へねじ込む際に、モジユール１４からの接点端
子１５が圧電素子１０のニツケル電極３ａに摺接
するが、ニツケル電極は硬いので削れることな
く、安定した導通状態を維持することができる。 In addition, the back cover 11 to which the piezoelectric element 10 is attached is attached to the body 1.
3, the contact terminal 15 from the module 14 comes into sliding contact with the nickel electrode 3a of the piezoelectric element 10, but since the nickel electrode is hard, it will not be scraped and a stable conductive state can be maintained.
ところで、電極面の削れ対策だけであれば、圧
電素子本体１の両面にニツケルを直接蒸着してニ
ツケル電極を形成した圧電素子を使用することも
考えられるが、そのような圧電素子は電極面の削
れや摩耗には強いが、ニツケルの蒸着層は横方向
の結合力が弱くしかも極めて薄いため、圧電素子
の機械的強度を高める効果は得られない。 By the way, if the only countermeasure is to prevent scratching of the electrode surface, it is conceivable to use a piezoelectric element in which nickel is directly deposited on both sides of the piezoelectric element body 1 to form a nickel electrode. Although resistant to abrasion and abrasion, the vapor-deposited layer of nickel has weak lateral bonding force and is extremely thin, so it cannot increase the mechanical strength of the piezoelectric element.
そのため、圧電素子を裏蓋に加圧して接着する
際に割れやすく、加圧力を２〜３Kgに下げなけれ
ばならず、圧電素子と裏蓋との密着性が悪くなる
ため充分なアラーム音が得られなくなる。 Therefore, when applying pressure to bond the piezoelectric element to the back cover, it tends to break, and the pressure must be lowered to 2 to 3 kg, which deteriorates the adhesion between the piezoelectric element and the back cover, making it difficult to obtain a sufficient alarm sound. I won't be able to do it.
なお、この発明による圧電素子は、機械的強度
が大きく、且つ電極面の削れや摩耗にも強いの
で、上述のような防水アラーム時計の音源用のみ
でなく、各種振動子あるいは加圧力センサ等とし
ても有効に使用し得ることは勿論である。 The piezoelectric element according to the present invention has high mechanical strength and is resistant to abrasion and abrasion of the electrode surface, so it can be used not only as a sound source for waterproof alarm clocks as described above, but also as various vibrators, pressure sensors, etc. Of course, it can also be used effectively.
以上説明してきたように、この発明による圧電
素子は、銀ペーストの焼付け層である銀電極によ
つてセラミツク板からなる圧電素子本体を保事し
てその機械的強度を高め、ニツケルの蒸着層であ
るニツケル電極によつて電極表面の硬度を高めて
いるので、例えば腕時計などの装置への組付けの
際に強い圧力が加わつたり、電極面に接点端子等
が摺接したりしても、割れたり電極が削れたりす
ることがなくなる。
As explained above, in the piezoelectric element according to the present invention, the piezoelectric element body made of a ceramic plate is protected by the silver electrode, which is a baked layer of silver paste, to increase its mechanical strength, and the piezoelectric element body is increased in mechanical strength by a layer of evaporated nickel. The hardness of the electrode surface is increased by using a certain nickel electrode, so even if strong pressure is applied when assembling it into a device such as a wristwatch, or if a contact terminal etc. comes into sliding contact with the electrode surface, it will not crack. This eliminates the possibility of the electrodes becoming scratched.
第１図は、この発明による圧電素子の構成を示
す拡大断面図、第２図は、従来の圧電素子の構成
を示す拡大断面図、第３図は、圧電素子を裏蓋直
鳴り式アラーム音源用振動子として組付けた防水
アラーム時計の概略断面図である。
１…圧電素子本体、２ａ，２ｂ…銀電極、３
ａ，３ｂ…ニツケル電極、１０…圧電素子、１１
…裏蓋、１２…接着剤、１３…胴、１４…モジユ
ール、１５…接点端子、１６…ガラス。
FIG. 1 is an enlarged sectional view showing the structure of a piezoelectric element according to the present invention, FIG. 2 is an enlarged sectional view showing the structure of a conventional piezoelectric element, and FIG. 1 is a schematic cross-sectional view of a waterproof alarm clock assembled as a commercial vibrator. 1... Piezoelectric element body, 2a, 2b... Silver electrode, 3
a, 3b...Nickel electrode, 10...Piezoelectric element, 11
...back cover, 12...adhesive, 13...body, 14...module, 15...contact terminal, 16...glass.
Claims (1)
電素子本体の両面にそれぞれ銀ペーストを焼付け
て形成した銀電極と、該銀電極上にそれぞれニツ
ケルを蒸着して形成したニツケル電極とからなる
ことを特徴とする圧電素子。1. It consists of a piezoelectric element body made of a ceramic plate, silver electrodes formed by baking silver paste on both sides of the piezoelectric element body, and nickel electrodes formed by vapor-depositing nickel on each of the silver electrodes. piezoelectric element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59214337A JPS6193799A (en) | 1984-10-15 | 1984-10-15 | Piezoelectric element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59214337A JPS6193799A (en) | 1984-10-15 | 1984-10-15 | Piezoelectric element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6193799A JPS6193799A (en) | 1986-05-12 |
| JPH058639B2 true JPH058639B2 (en) | 1993-02-02 |
Family
ID=16654087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59214337A Granted JPS6193799A (en) | 1984-10-15 | 1984-10-15 | Piezoelectric element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6193799A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51107078A (en) * | 1975-03-17 | 1976-09-22 | Tdk Electronics Co Ltd | Atsudenshindoshino seizohoho |
-
1984
- 1984-10-15 JP JP59214337A patent/JPS6193799A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51107078A (en) * | 1975-03-17 | 1976-09-22 | Tdk Electronics Co Ltd | Atsudenshindoshino seizohoho |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6193799A (en) | 1986-05-12 |
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