JPS6047543B2 - Pyroelectric infrared detector - Google Patents
Pyroelectric infrared detectorInfo
- Publication number
- JPS6047543B2 JPS6047543B2 JP55188508A JP18850880A JPS6047543B2 JP S6047543 B2 JPS6047543 B2 JP S6047543B2 JP 55188508 A JP55188508 A JP 55188508A JP 18850880 A JP18850880 A JP 18850880A JP S6047543 B2 JPS6047543 B2 JP S6047543B2
- Authority
- JP
- Japan
- Prior art keywords
- pellet
- support base
- pyroelectric
- infrared detector
- infrared rays
- 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
Links
- 239000008188 pellet Substances 0.000 claims description 32
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 239000012212 insulator Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 description 9
- 230000001070 adhesive effect Effects 0.000 description 9
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/34—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using capacitors, e.g. pyroelectric capacitors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Burglar Alarm Systems (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Radiation Pyrometers (AREA)
Description
【発明の詳細な説明】
本発明は入射赤外線変化量に応じて電荷を発生する焦電
体ペレットを備えた焦電型赤外線検出器に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pyroelectric infrared detector equipped with a pyroelectric pellet that generates electric charge depending on the amount of change in incident infrared radiation.
以下本発明実施例を侵入警報器の検知部に用いる焦電型
赤外線検出器について図面を参照して詳述する。DESCRIPTION OF THE PREFERRED EMBODIMENTS A pyroelectric infrared detector according to an embodiment of the present invention used in a detection section of an intruder alarm will be described in detail below with reference to the drawings.
１は入射赤外線変化量に応じて電荷を発生するタンタル
酸リチウム（ＬｉＴａ００）単結晶等で形成された厚さ
数１０μｍの焦電体ペレットで、該ペレットの表、裏面
にはニクロム（Ｎｉ−Ｃｒ）の真空蒸着膜より成る表、
裏面電極２、３が形成されている。1 is a pyroelectric pellet several tens of micrometers thick made of lithium tantalate (LiTa00) single crystal, etc., which generates electric charge according to the amount of change in incident infrared rays.The front and back surfaces of the pellet are coated with nichrome (Ni-Cr ), a table consisting of a vacuum-deposited film of
Back electrodes 2 and 3 are formed.
表面電極２は互いに分離され且つ同形状を有する第１、
第２表面電極２ａ、２ｂから成り、裏面電極３は上記ペ
レット１の裏面全面に施されている。４ａ、４ｂは夫々
上記第１、第２表面電極２ａ、２ｂに銀ペースト等の導
電性接着剤５ａ、。The surface electrodes 2 are separated from each other and have the same shape.
It consists of second surface electrodes 2a and 2b, and a back surface electrode 3 is applied to the entire back surface of the pellet 1. 4a and 4b are conductive adhesives 5a such as silver paste on the first and second surface electrodes 2a and 2b, respectively.
５ｂにて接着された第１、第２引出し線で、第１引出し
線４ａは金属性ヘッダ６に接続されて接地され、第２引
出し線４ｂは出力端子（図示しない）に接続されている
。The first and second lead lines 5b are bonded together, and the first lead line 4a is connected to the metal header 6 and grounded, and the second lead line 4b is connected to an output terminal (not shown).
そして、上記焦電体ペレット１前面において、人が矢印
Ａの如く通過すると、まず第１表面電極２ａ側のペレッ
ト１にて人体から放射された赤外線に基づいて入射赤外
線量が変化する。When a person passes through the front surface of the pyroelectric pellet 1 as shown by arrow A, the amount of incident infrared rays changes based on the infrared rays emitted from the human body at the pellet 1 on the first surface electrode 2a side.
斯る場合、第１表面電極２ａ側のペレット１に電荷が発
生し、斯る電荷による信号は第２引出し線４ｂを介して
出力端子へ導出される。In such a case, charges are generated in the pellet 1 on the first surface electrode 2a side, and a signal due to the charges is led out to the output terminal via the second lead line 4b.
次いで第２表面電極２ｂ側のペレット１にて入射赤外線
量１が変化する。斯る場合も同様にして信号は、第２引
出し線４ｂを介して出力端子へ導出される。そして、こ
れらの信号に基づいて侵入警報器からは警報が発せられ
る。尚、上記ペレット１において、例えば白熱球の点灯
により白熱球から放射される赤外線に対しては、入射赤
外線量が変化しても出力端子に信号は出力されない。Next, the amount 1 of incident infrared rays changes in the pellet 1 on the second surface electrode 2b side. In such a case, the signal is similarly led out to the output terminal via the second lead line 4b. Based on these signals, the intruder alarm issues an alarm. In the pellet 1, for example, no signal is output to the output terminal for infrared rays emitted from an incandescent bulb when the incandescent bulb is lit, even if the amount of incident infrared rays changes.
即ち、斯る場合、ペレット１全面に亘つて等量の赤外線
が同時に入射するから、第１及ひ第２表面電極２ａ、２
ｂには等量且つ同符号の電荷が同時に発生し、従つて第
１及び第２表面電極２ａ、２ｂの電荷は相殺されて出力
端子に信号は出力されない。７は上面において上記ペレ
ット１を裏面電極３を介して支持する支持台で、該支持
台は下記理由により上記ペレット１と略同一の熱膨張係
数を有する材料から成つている。That is, in such a case, since the same amount of infrared rays is simultaneously incident over the entire surface of the pellet 1, the first and second surface electrodes 2a, 2
Charges of the same amount and sign are generated at the same time on b, so that the charges on the first and second surface electrodes 2a and 2b cancel each other out, and no signal is output to the output terminal. Reference numeral 7 denotes a support base that supports the pellet 1 on its upper surface via the back electrode 3, and the support base is made of a material having substantially the same coefficient of thermal expansion as the pellet 1 for the following reason.
ここに、上記ペレット１の熱膨張係数は比較的大きく、
従つてこれと略同一の熱膨張係数を有し且つ安価な支持
台７の材料としては銅、アルミニウム等の金属が挙げら
れる。更に、上記支持台７の上面には周縁部８を残して
凹部９がエッチング形成されている。斯るエッチングは
対象物が金属であるためにその形成が容易である。そし
て、上記凹部９により上記ペレット１の出力は増大する
ものである。即ち、上記ペレット１はその散逸熱が小で
ある程出力が増大する特性を有しており、従つて上記凹
部９により上記ペレット１が支持台７に対して断熱され
ペレット１の散逸熱が低く抑えられている状態ではペレ
ット１の出力は増大するのである。１０は上記ペレット
１の裏面電極３と支持台７上面との間に介在されたエポ
キシ系等の非導電性接着剤である。Here, the thermal expansion coefficient of the pellet 1 is relatively large,
Therefore, metals such as copper and aluminum can be used as materials for the support base 7 that have substantially the same coefficient of thermal expansion and are inexpensive. Further, a recess 9 is formed on the upper surface of the support base 7 by etching, leaving a peripheral edge 8 intact. Such etching is easy to form because the object is metal. The recess 9 increases the output of the pellet 1. That is, the pellet 1 has a characteristic that the output increases as its dissipated heat decreases. Therefore, the pellet 1 is insulated from the support base 7 by the recess 9, and the dissipated heat of the pellet 1 is reduced. In the suppressed state, the output of the pellet 1 increases. Reference numeral 10 denotes a non-conductive adhesive such as an epoxy adhesive interposed between the back electrode 3 of the pellet 1 and the upper surface of the support base 7.
ここに、斯る接着剤１０の介在状態において、接着剤１
０は熱硬化される必要がある。この場合、接着剤１０は
上記ペレット１及び支持台７と共に加熱されるため、ペ
レット１と支持台７との熱膨張係数に差があると、加熱
後ペレット１に歪みが生じ赤外線検出器の不良原因とな
る。しかるに、上記支持台７はペレット１と略同一の熱
膨張係数を有する銅、アルミニウム等の金属から成つて
いるため、上記歪みに生じることはない。さて、上記支
持台７は通常上記接着剤１０と同様の非導電性接着剤１
１により直接ヘッダ６に固着されている。Here, in the state where the adhesive 10 is present, the adhesive 1
0 needs to be heat cured. In this case, since the adhesive 10 is heated together with the pellet 1 and the support 7, if there is a difference in the coefficient of thermal expansion between the pellet 1 and the support 7, the pellet 1 will be distorted after heating, resulting in a defect in the infrared detector. Cause. However, since the support base 7 is made of a metal such as copper or aluminum having substantially the same coefficient of thermal expansion as the pellet 1, the above distortion does not occur. Now, the support base 7 is usually made of a non-conductive adhesive 1 similar to the adhesive 10 described above.
1 is directly fixed to the header 6.
斯る場合、上記いずれの接着剤１０，１１も厚さが約５
０〜１００ｐｒｒ１．と極めて薄く、従つて上記接着剤
１０，１１は絶縁性であるにも拘わらす絶縁不良を起し
、第１表面電極２ａと裏面電極３とがヘッダ６及び支持
台７を介して約６５％の割合で短絡してしまう。斯る短
絡時には上記白熱球から放射される赤外線などに対して
上記電荷の相殺効果は現われす第２引出し線４ｂを介し
て出力端子に信号が出力され、従つて人が侵入していな
いにも拘わらず侵入警報器からは警報が発せられる。１
２は斯る点に鑑みて上記ヘッダ６と支持台７との間に介
挿固着されたアルミナセラミック、ガラス等の絶縁体で
、該絶縁体により第１表面電極２ａと裏面電極３とが短
絡する割合が一挙にＯとなる。In such a case, both of the adhesives 10 and 11 have a thickness of about 5 mm.
0~100prr1. Therefore, although the adhesives 10 and 11 are insulating, they cause insulation failure, and the first surface electrode 2a and the back surface electrode 3 are separated by about 65% through the header 6 and the support base 7. Short circuit occurs at a rate of . When such a short circuit occurs, the electric charge cancels out the infrared rays emitted from the incandescent bulb, and a signal is output to the output terminal via the second lead wire 4b, so even if no one is intruding. Regardless, the intruder alarm will issue an alarm. 1
In view of this, reference numeral 2 denotes an insulator such as alumina ceramic or glass that is inserted and fixed between the header 6 and the support base 7, and the first surface electrode 2a and the back electrode 3 are short-circuited by this insulator. The proportion that does this all at once becomes O.
以上の説明から明らかな如く、本発明焦電型赤外線検出
器によれば、表、裏面電極を有し入射赤外線変化量に応
じて電荷を発生する焦電体ペレット、該ペレットと略同
一の熱膨張係数を有し上記ペレットを上記裏面電極を介
して支持すると共にその支持面に凹部が形成された金属
から成る支持台、該支持台と金属性ヘッダとの間に介挿
固着された絶縁体を備えたから、上記ペレットは加熱後
・においても歪まず且つペレットの出力を増大できると
共に、ペレットの裏面電極が表面電極等に短絡すること
を顕著に抑制てきるから上記検出器を侵入警報器の検知
部に組込んだ場合でも斯る警報器から誤報が発せられる
ことはない。As is clear from the above description, the pyroelectric infrared detector of the present invention has a pyroelectric pellet that has front and back electrodes and generates an electric charge according to the amount of change in incident infrared rays, A support stand made of a metal having an expansion coefficient and supporting the pellet via the back electrode and having a recess formed in the support surface, and an insulator interposed and fixed between the support stand and the metal header. Because of this, the pellets are not distorted even after heating and the output of the pellets can be increased, and the short circuit of the back electrode of the pellet to the front electrode etc. can be significantly suppressed, so the detector can be used as an intruder alarm. Even when incorporated into the detection unit, such an alarm will not issue a false alarm.
ｊ図面の簡単な説明 図は本発明実施例焦電型赤外線検出器の断面図である。j Brief explanation of the drawing The figure is a sectional view of a pyroelectric infrared detector according to an embodiment of the present invention.
Claims (1)
を発生する焦電体ペレット、該ペレットと略同一の熱膨
張係数を有し、上記ペレットを上記裏面電極を介して支
持すると共にその支持面に凹部が形成された金属から成
る支持台、該支持台と金属性ヘッダとの間に介挿固着さ
れた絶縁体を備えたことを特徴とする焦電型赤外線検出
器。1 A pyroelectric pellet that has front and back electrodes and generates electric charge according to the amount of change in incident infrared rays, which has approximately the same coefficient of thermal expansion as the pellet, supports the pellet via the back electrode, and supports the pellet through the back electrode. A pyroelectric infrared detector comprising: a support base made of metal with a recess formed in the support surface; and an insulator inserted and fixed between the support base and a metal header.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55188508A JPS6047543B2 (en) | 1980-12-29 | 1980-12-29 | Pyroelectric infrared detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55188508A JPS6047543B2 (en) | 1980-12-29 | 1980-12-29 | Pyroelectric infrared detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57113331A JPS57113331A (en) | 1982-07-14 |
| JPS6047543B2 true JPS6047543B2 (en) | 1985-10-22 |
Family
ID=16224943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55188508A Expired JPS6047543B2 (en) | 1980-12-29 | 1980-12-29 | Pyroelectric infrared detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6047543B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6017429U (en) * | 1983-07-14 | 1985-02-06 | 株式会社 堀場製作所 | Dual type pyroelectric infrared detector |
| GB8900688D0 (en) * | 1989-01-12 | 1989-07-05 | Thorn Emi Electronics Ltd | Thermal imaging device |
-
1980
- 1980-12-29 JP JP55188508A patent/JPS6047543B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57113331A (en) | 1982-07-14 |
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