JPH03179228A - Piezo-electric sensor - Google Patents
Piezo-electric sensorInfo
- Publication number
- JPH03179228A JPH03179228A JP1318011A JP31801189A JPH03179228A JP H03179228 A JPH03179228 A JP H03179228A JP 1318011 A JP1318011 A JP 1318011A JP 31801189 A JP31801189 A JP 31801189A JP H03179228 A JPH03179228 A JP H03179228A
- Authority
- JP
- Japan
- Prior art keywords
- piezo
- piezoelectric ceramic
- support plate
- lead
- ceramic
- 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.)
- Pending
Links
- 239000000919 ceramic Substances 0.000 claims abstract description 42
- 239000000853 adhesive Substances 0.000 claims abstract description 10
- 230000001070 adhesive effect Effects 0.000 claims abstract description 10
- 230000010287 polarization Effects 0.000 claims abstract description 8
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 238000005336 cracking Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- 238000010411 cooking Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Cookers (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、圧電セラミックの焦電効果を用いて温度変化
を検出する圧電センサに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a piezoelectric sensor that detects temperature changes using the pyroelectric effect of piezoelectric ceramics.
従来の技術
近年、調理機器業界では食品の調理制御を目的とし、調
理室の温度変化や蒸気の発生を検知するセンサに対する
要望が高まっており、使用環境条件の範囲が広く、高信
頼でかつ安価なセンサが要望されている。Conventional technology In recent years, there has been an increasing demand in the cooking equipment industry for sensors that can detect temperature changes and steam generation in the cooking chamber for the purpose of controlling food cooking. There is a demand for a sensor that
従来の電圧センサは金属製支持板上に平板の圧電セラミ
ックを貼合わせた構造で、支持板側を検知面として支持
板を通じて温度変化を圧電セラミックに伝達し、この圧
電セラミックの焦電効果によって出力信号を得る方式で
、一般に圧電セラミックの裏面電極を圧電セラミックの
側面を通って表面電極に導く電極構造とするために、前
もって裏面電極と表面電極を導電性ペーストで塗布し導
通させる。調理室や調理室の排気通路の内壁に、前記支
持板を取り付けて使用する。Conventional voltage sensors have a structure in which a flat piezoelectric ceramic is bonded to a metal support plate. Temperature changes are transmitted to the piezoelectric ceramic through the support plate with the support plate side as the detection surface, and output is generated by the pyroelectric effect of this piezoelectric ceramic. In order to obtain a signal, the electrode structure is generally such that the back electrode of the piezoelectric ceramic is led to the front electrode through the side surface of the piezoelectric ceramic, by coating the back electrode and the front electrode with a conductive paste in advance to make them conductive. The support plate is attached to the inner wall of the cooking chamber or the exhaust passage of the cooking chamber.
発明が解決しようとする課題
しかしながら、上記の従来の構成では、支持板と接着す
る圧電セラミックの裏面電極が、導電ペーストを塗布し
た部分で盛上るため調理機器が２００℃の高温まで急激
な温度変化にさらされることにより圧電セラミックが支
持板から剥離したり、圧電セラミックにクラックが発生
したり電極が断線したりするという問題点を有していた
。Problems to be Solved by the Invention However, in the conventional configuration described above, the back electrode of the piezoelectric ceramic that adheres to the support plate bulges in the area where the conductive paste is applied, so the cooking appliance is subject to rapid temperature changes up to 200 degrees Celsius. There have been problems in that the piezoelectric ceramic may peel off from the support plate, cracks may occur in the piezoelectric ceramic, or electrodes may be disconnected due to exposure to.
本発明は、上記従来の問題点を解決するもので使用温度
範囲が非常に広くかつ急激な温度変化にさらされる用途
にも使用することのできる圧電センサを提供することを
目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a piezoelectric sensor that solves the above-mentioned conventional problems and can be used in applications that have a very wide operating temperature range and are exposed to rapid temperature changes.
課題を解決するための手段
この目的を達成するために本発明の圧電センサは、支持
板上に圧電セラミックを弾性を有する接着剤で接着し、
この圧電セラミックの表面にほぼ等しい面積の２分割さ
れた電極を付し、裏面電極と表面電極間の分極方向が２
個の表面電極において互いに逆であり、それぞれの表面
電極から出力端子となるリード線を引き出したものであ
る。Means for Solving the Problems To achieve this object, the piezoelectric sensor of the present invention includes a piezoelectric ceramic bonded to a support plate using an elastic adhesive,
A two-part electrode with approximately equal area is attached to the surface of this piezoelectric ceramic, and the polarization direction between the back electrode and the front electrode is 2.
The front surface electrodes are opposite to each other, and lead wires serving as output terminals are drawn out from each surface electrode.
作用
この構成によって、従来の圧電センサのように圧電セラ
ミックの裏面電極を表面に回し込むために圧電セラミッ
ク側面を通って表面に到る回し込みの電極を形成する必
要がなく、圧電セラミックの接着面を平坦にすることが
できるので圧電セラミックのストレスが小さくなりクラ
ックの発生もなく、さらに組立て時における回し込み部
の電極の断線やクラックの発生もない。さらに、圧電セ
ラミックと支持板との貼り合せに弾性を有する接着剤を
使用することにより、ストレスをより小さくすることが
でき、高温や急激な温度変化に対して安定性を増すこと
ができる。Effect: With this configuration, unlike conventional piezoelectric sensors, there is no need to form an electrode that passes through the side surface of the piezoelectric ceramic to the front surface in order to route the back electrode of the piezoelectric ceramic to the front surface, and the bonding surface of the piezoelectric ceramic Since the piezoelectric ceramic can be made flat, the stress on the piezoelectric ceramic is reduced and no cracks occur, and furthermore, there is no disconnection or cracks in the electrodes at the winding portion during assembly. Furthermore, by using an elastic adhesive to bond the piezoelectric ceramic and the support plate, stress can be further reduced and stability against high temperatures and rapid temperature changes can be increased.
実施例
以下本発明の一実施例について、図面を参照しながら説
明する。第１図は、本発明における圧電センサの正面図
を示すものである。EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 shows a front view of a piezoelectric sensor according to the present invention.
第２図は、圧電セラミックの分極方向を示す図である。FIG. 2 is a diagram showing the polarization direction of the piezoelectric ceramic.
第１図において平板状の支持板１は、圧電セラミック２
を保持して、その破損を防止するとともに圧電セラミッ
ク２に温度変化を的確に伝達し、耐蝕性に優れ熱伝導性
も良い耐久性の十分な材料（ステンレス鋼やアルミニウ
ムなど）でできている。表面電極３は、圧電セラミック
２の表面をほぼ等しい面積に２分割するように形成され
ている。In FIG. 1, a flat support plate 1 includes a piezoelectric ceramic 2
It is made of a sufficiently durable material (stainless steel, aluminum, etc.) that has excellent corrosion resistance and good thermal conductivity, so as to prevent its damage and accurately transmit temperature changes to the piezoelectric ceramic 2. The surface electrode 3 is formed to divide the surface of the piezoelectric ceramic 2 into two approximately equal areas.
第２図に示すように圧電セラミック２は、表面電極３と
裏面電極４において、２つの表面電極３のそれぞれの分
極方向５および６が逆になるように分極処理されている
。接着剤７は、支持板１と圧電セラミック２を貼合せる
もので支持板１と圧電セラミック２の熱膨張係数の差に
よって発生するストレスを吸収するため弾性を有するシ
リコン系材料を用いる。リード線８は２つの表面電極３
にそれぞれ接続されていて、温度変化による圧電セラミ
ック２の焦電効果によって発生した電荷を出力信号とし
て取り出すものである。As shown in FIG. 2, the piezoelectric ceramic 2 is polarized so that the polarization directions 5 and 6 of the two front electrodes 3 are reversed in the front electrode 3 and the back electrode 4, respectively. The adhesive 7 is used to bond the support plate 1 and the piezoelectric ceramic 2 together, and is made of an elastic silicon-based material to absorb stress caused by the difference in thermal expansion coefficient between the support plate 1 and the piezoelectric ceramic 2. Lead wire 8 connects two surface electrodes 3
The electric charge generated by the pyroelectric effect of the piezoelectric ceramic 2 due to temperature change is extracted as an output signal.
以上のように本実施例によれば、圧電セラミック２のほ
ぼ全面に設けられた裏面電極４を弾性接着剤７で支持板
１に接着し、はぼ等しい面積に２分割された表面電極３
と裏面電極４間の分極方向が逆に設けられているので、
導電性ペーストを塗布する工程を省くことができるとと
もに圧電セラミンク２のクラックおよび断線の原因をな
くすことができる。As described above, according to this embodiment, the back electrode 4 provided on almost the entire surface of the piezoelectric ceramic 2 is adhered to the support plate 1 with the elastic adhesive 7, and the front electrode 3 is divided into two parts having approximately equal areas.
Since the polarization direction between the electrode 4 and the back electrode 4 is reversed,
The step of applying a conductive paste can be omitted, and the causes of cracks and disconnections in the piezoelectric ceramic ink 2 can be eliminated.
発明の効果
以上のように本発明によれば、圧電セラミックの側面を
介さずに表面電極からリード線を取り出せるので、組立
時あるいは急激な温度変化のある使用時においても、圧
電セラミックのクラックや電極の断線を防止でき、さら
に弾性を有す接着剤により圧電セラミックと支持板が貼
合わされていることにより圧電セラミックと支持板の熱
膨張係数の差によるストレスを接着剤によって吸収させ
、圧電セラミックの剥離や割れをなくすことができる優
れた圧電センサを実現できるものである。Effects of the Invention As described above, according to the present invention, the lead wire can be taken out from the surface electrode without passing through the side surface of the piezoelectric ceramic, so even during assembly or use with sudden temperature changes, cracks in the piezoelectric ceramic and electrodes can be removed. In addition, since the piezoelectric ceramic and the support plate are bonded together using an elastic adhesive, the stress caused by the difference in thermal expansion coefficient between the piezoelectric ceramic and the support plate is absorbed by the adhesive, and peeling of the piezoelectric ceramic is prevented. This makes it possible to realize an excellent piezoelectric sensor that can eliminate cracks and cracks.
第１図は本発明の一実施例の圧電センサを示す正面図、
第２図は本発明の圧電セラミックの分極方向を示す図で
ある。
１・・・・・・支持板、２・・・・・・圧電セラミック
、３・・・・・・表面電極、４・・・・・・裏面電極、
７・・・・・・接着剤。FIG. 1 is a front view showing a piezoelectric sensor according to an embodiment of the present invention;
FIG. 2 is a diagram showing the polarization direction of the piezoelectric ceramic of the present invention. 1... Support plate, 2... Piezoelectric ceramic, 3... Surface electrode, 4... Back electrode,
7...Adhesive.
Claims (2)
成され、圧電セラミックの一方の平面上のほぼ全面に設
けられた裏面電極が支持板に接着され、他方の平面上に
ほぼ等しい面積に２分割された表面電極を有し、裏面電
極と表面電極間の分極方向が２個の表面電極において互
いに逆で、それぞれの表面電極にリード線を接続した圧
電センサ。(1) Consisting of a flat piezoelectric ceramic, a support plate, and a lead wire, a back electrode provided on almost the entire surface of one plane of the piezoelectric ceramic is adhered to the support plate, and two electrodes of approximately equal area on the other plane are attached. A piezoelectric sensor that has a divided front electrode, the polarization direction between the back electrode and the front electrode is opposite to each other, and a lead wire is connected to each front electrode.
性を有する接着剤を使用した請求項１記載の圧電センサ
。(2) The piezoelectric sensor according to claim 1, wherein an elastic adhesive is used to bond the back electrode of the piezoelectric ceramic to the support plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1318011A JPH03179228A (en) | 1989-12-07 | 1989-12-07 | Piezo-electric sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1318011A JPH03179228A (en) | 1989-12-07 | 1989-12-07 | Piezo-electric sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03179228A true JPH03179228A (en) | 1991-08-05 |
Family
ID=18094496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1318011A Pending JPH03179228A (en) | 1989-12-07 | 1989-12-07 | Piezo-electric sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03179228A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59120831A (en) * | 1982-12-27 | 1984-07-12 | Nippon Denso Co Ltd | Apparatus for detecting infrared rays |
| JPS59206727A (en) * | 1983-05-11 | 1984-11-22 | Sanyo Electric Co Ltd | Infrared detector |
-
1989
- 1989-12-07 JP JP1318011A patent/JPH03179228A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59120831A (en) * | 1982-12-27 | 1984-07-12 | Nippon Denso Co Ltd | Apparatus for detecting infrared rays |
| JPS59206727A (en) * | 1983-05-11 | 1984-11-22 | Sanyo Electric Co Ltd | Infrared detector |
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