JPH0552649A - Infrared radiation detector - Google Patents
Infrared radiation detectorInfo
- Publication number
- JPH0552649A JPH0552649A JP24258991A JP24258991A JPH0552649A JP H0552649 A JPH0552649 A JP H0552649A JP 24258991 A JP24258991 A JP 24258991A JP 24258991 A JP24258991 A JP 24258991A JP H0552649 A JPH0552649 A JP H0552649A
- Authority
- JP
- Japan
- Prior art keywords
- infrared
- case
- infrared radiation
- moisture
- pzt element
- 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
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、人体などから発せられ
る赤外線を検出するための赤外線検出器に関し、より詳
しくは、ケース上面の開口を赤外線透過窓で閉塞すると
共に、赤外線検出手段を前記ケースに内蔵し、かつ、当
該赤外線検出手段に電気的に接続されるリードピンを貫
設したステムにより、ケース下部側の開口を閉塞して成
る赤外線検出器の改良技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared detector for detecting infrared rays emitted from a human body. More specifically, the opening of the upper surface of the case is closed by an infrared transmitting window and the infrared detecting means is used as the case. TECHNICAL FIELD The present invention relates to an improved technique of an infrared detector in which an opening on the lower side of the case is closed by a stem having a lead pin penetratingly incorporated therein and electrically connected to the infrared detecting means.
【０００２】[0002]
【従来の技術】かゝる赤外線検出器において、前記赤外
線検出手段は、例えば、抵抗体が形成された基板と、前
記抵抗体に並列接続されるＰＺＴ素子と、当該ＰＺＴ素
子の出力側に接続されるＦＥＴとを主体に構成され、か
つ、特にＰＺＴ素子の受光面が湿度により絶縁劣化する
と感度低下に繋がることから、当該赤外線検出手段をケ
ース内に密封させている。In such an infrared detector, the infrared detecting means is connected to, for example, a substrate on which a resistor is formed, a PZT element connected in parallel with the resistor, and an output side of the PZT element. The infrared detecting means is hermetically sealed in the case because the sensitivity is lowered when the light receiving surface of the PZT element is insulation-degraded due to humidity.
【０００３】そして、前記赤外線透過窓を例えば樹脂系
の接着剤によってケース上面の開口まわりに接合し、前
記リードピンのステム貫通部にはハーメチックのシール
を施し、ケース下部側の開口にはステムを電気溶接する
といった防湿対策がとられているのである。Then, the infrared transmitting window is bonded around the opening on the upper surface of the case with, for example, a resin adhesive, the stem penetrating portion of the lead pin is hermetically sealed, and the stem is electrically connected to the opening on the lower side of the case. Moisture-proof measures such as welding are taken.
【０００４】[0004]
【発明が解決しようとする課題】しかし、前記赤外線透
過窓やステムのケースに対するシールが不充分であった
り、何らかの機械的ストレスによってハーメチックシー
ル部が損傷したりすると、そのシール不良の部位からケ
ース内に湿気が侵入して、シャント抵抗の絶縁低下など
に起因する感度低下を避け得ないものであった。However, if the infrared transmission window or the stem is not sufficiently sealed to the case, or if the hermetically sealed portion is damaged by some mechanical stress, the portion inside the case is defectively sealed. It was inevitable that moisture would infiltrate into the sensor and cause a decrease in sensitivity due to a decrease in insulation of the shunt resistance.
【０００５】本発明は、かゝる事態が生じた際の防湿対
策を講じて、湿気に起因する感度低下の抑止は当然のこ
とながら、更に赤外線検出感度のアップを期待できる信
頼性の高い赤外線検出器を提供することを目的としてい
る。The present invention takes a moisture-proof measure when such a situation occurs to prevent the decrease in sensitivity due to humidity, and is also a highly reliable infrared ray which can be expected to further increase the infrared detection sensitivity. The purpose is to provide a detector.
【０００６】[0006]
【課題を解決するための手段】上記の目的を達成するた
めに本発明は、前記赤外線検出手段の少なくともＰＺＴ
素子の受光面をフッ素系の防湿コート剤で被覆させた点
に特徴がある。In order to achieve the above object, the present invention provides at least PZT of the infrared detecting means.
The feature is that the light receiving surface of the element is coated with a fluorine-based moisture-proof coating agent.
【作用】上記の特徴構成によれば、ＰＺＴ素子の特に湿
気を帯びることを嫌う受光面の防湿が達成される上に、
このための防湿コート剤が赤外線の反射を抑止した状態
で効果的に赤外線を吸収する。According to the above characteristic structure, moisture-proofing of the light-receiving surface of the PZT element which is particularly resistant to moisture is achieved, and
The moisture-proof coating agent for this purpose absorbs infrared rays effectively while suppressing reflection of infrared rays.
【０００７】[0007]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。図１は赤外線検出器の全体を示し、図２は赤外線
検出器の等価回路を示すものであって、これらの図にお
いて、１は金属製のケースであって、その上面の中心部
には開口２が形成されている。３は前記開口２をケース
内面側から閉塞する赤外線透過窓で、接着剤によってケ
ース１に接合されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the whole infrared detector, and FIG. 2 shows an equivalent circuit of the infrared detector. In these drawings, 1 is a metal case, and an opening is formed at the center of its upper surface. 2 is formed. Reference numeral 3 denotes an infrared transparent window that closes the opening 2 from the inner surface of the case, and is joined to the case 1 with an adhesive.
【０００８】４はケース下部のフランジ1aに溶接されて
ケース１を密閉するステムで、貫通する３本のリードピ
ン（図１には２本だけが図示されている）５を保持して
おり、かつ、前記リードピン５の貫通部にはハーメチッ
クシールが施されている。６はリードピン５に電気的に
接続された赤外線検出手段で、上部に抵抗体７が形成さ
れた基板８と、当該基板８の下面側に設けられたＦＥＴ
９と、シリコン樹脂等の緩衝材10を介して基板８上に設
けられたＰＺＴ素子11とから成り、前記ケース１とステ
ム４とによる密閉空間に納められている。Reference numeral 4 denotes a stem which is welded to the flange 1a at the lower part of the case and seals the case 1, which holds three lead pins 5 (only two of which are shown in FIG. 1) 5 and A hermetic seal is applied to the penetrating portion of the lead pin 5. Reference numeral 6 denotes an infrared detecting means electrically connected to the lead pin 5, a substrate 8 on which a resistor 7 is formed, and an FET provided on the lower surface side of the substrate 8.
9 and a PZT element 11 provided on the substrate 8 via a cushioning material 10 such as a silicone resin, and housed in a closed space defined by the case 1 and the stem 4.
【０００９】かゝる構成の赤外線検出器において、前記
ＰＺＴ素子11の受光面をフッ素系の防湿コート剤12で被
覆している。より具体的には、例えば旭硝子株式会社製
の商品名がＥＣ−１０４である防湿コート剤12を、刷毛
やスプレー等の手段でＰＺＴ素子11の受光面に保持させ
ており、図３にこの防湿コート剤12の赤外線吸収スペク
トルを符号ａで示す。In the infrared detector having such a structure, the light receiving surface of the PZT element 11 is covered with a fluorine-based moisture-proof coating agent 12. More specifically, for example, a moisture-proof coating agent 12 manufactured by Asahi Glass Co., Ltd. under the trade name of EC-104 is held on the light-receiving surface of the PZT element 11 by means such as a brush or a spray. The infrared absorption spectrum of the coating agent 12 is indicated by the symbol a.
【００１０】この図で明らかなように、上記フッ素系の
防湿コート剤12は、赤外線検出にとって重要な１２００
±１００cm-1付近の赤外線吸収率が非常に高い特性を示
すものであり、この特性は、上記ＥＣ−１０４以外の例
えばＥＣ−１０６，１２０，２００，３００，４００と
いった防湿コート剤（いずれも旭硝子株式会社の商品
名）についても、ほゞ同じである。As is clear from this figure, the above-mentioned fluorine-based moisture-proof coating agent 12 is important for detecting infrared rays.
It exhibits a very high infrared absorptivity in the vicinity of ± 100 cm −1 . This property is a moisture-proof coating agent other than EC-104, such as EC-106, 120, 200, 300, 400 (all of which are Asahi Glass). The same applies to the product name of the stock company).
【００１１】かゝる構成によれば、赤外線透過窓３を透
過した赤外線は、反射が抑止された状態で効果的に防湿
コート剤12に吸収され、かつ、前記ＰＺＴ素子11に伝播
されることで、当該ＰＺＴ素子11による赤外線検出の感
度が高められる。According to such a configuration, the infrared rays transmitted through the infrared transmission window 3 are effectively absorbed by the moisture-proof coating agent 12 and are propagated to the PZT element 11 in a state where reflection is suppressed. Thus, the sensitivity of infrared detection by the PZT element 11 is increased.
【００１２】図３において、符号ｂはＰＺＴ素子11の受
光面に防湿コート剤12を保持させないときの赤外線の吸
収スペクトルを示し、符号ｃはＰＺＴ素子11の受光面に
防湿コート剤12を保持させたときの実験結果による赤外
線の吸収スペクトルを示すものであって、前記ＰＺＴ素
子11の受光面に防湿コート剤12を保持させることによっ
て、１２００±１００cm-1付近における赤外線の吸収効
率が約５％以上アップすることが判明した。In FIG. 3, reference numeral b indicates an infrared absorption spectrum when the moisture-proof coating agent 12 is not retained on the light-receiving surface of the PZT element 11, and reference symbol c is the moisture-proof coating agent 12 retained on the light-receiving surface of the PZT element 11. The infrared absorption spectrum according to the experimental results is shown. By holding the moisture-proof coating agent 12 on the light receiving surface of the PZT element 11, the infrared absorption efficiency in the vicinity of 1200 ± 100 cm −1 is about 5%. It turned out that it improved above.
【００１３】一方、前記ケース１に対する赤外線透過窓
３やステム４のシール不良、あるいは、機械的ストレス
等によるリードピン５のステム４に対するシール不良が
生じたとしても、前記ＰＺＴ素子11の受光面にフッ素系
の防湿コート剤12を保持させているので、当該シール不
良の部位からケース内に湿気が侵入することに起因する
赤外線検出の感度低下を回避させることができる。On the other hand, even if the infrared transmission window 3 and the stem 4 are not properly sealed with respect to the case 1 or the lead pin 5 is poorly sealed with respect to the stem 4 due to mechanical stress or the like, the PZT element 11 receives fluorine on its light-receiving surface. Since the system moisture-proof coating agent 12 is held, it is possible to avoid a decrease in the sensitivity of infrared detection due to the intrusion of moisture into the case from the site of the defective seal.
【００１４】尚、実施例では、ＰＺＴ素子11の受光面の
みをフッ素系の防湿コート剤12で被覆しているが、湿気
による悪影響を確実に避ける上からは、図４に示すよう
に、赤外線検出手段６の全体をフッ素系の防湿コート剤
12で被覆することが望ましく、この場合、赤外線検出手
段６にフッ素系の防湿コート剤12を浸漬コーティングさ
せることで、コスト的に安価に防湿コート剤12の被覆が
達成される。In the embodiment, only the light-receiving surface of the PZT element 11 is coated with the fluorine-based moisture-proof coating agent 12. However, in order to surely avoid the adverse effect of moisture, as shown in FIG. The entire detection means 6 is a fluorine-based moisture-proof coating agent
It is desirable to coat with the moisture-proof coating agent 12. In this case, by coating the infrared detection means 6 with the fluorine-based moisture-proof coating agent 12, the moisture-proof coating agent 12 can be coated at low cost.
【００１５】[0015]
【発明の効果】以上説明したように本発明の赤外線検出
器によれば、ＰＺＴ素子の特に湿気を帯びることを嫌う
受光面の防湿が確実に達成される。しかも、そのための
防湿コート剤が反射を抑止して赤外線を効果的に吸収す
ることから、ＰＺＴ素子の赤外線検出感度が大幅にアッ
プし、ひいては、信頼性の高い赤外線検出器を提供でき
るに至ったのである。As described above, according to the infrared detector of the present invention, it is possible to surely achieve the moisture-proofing of the light-receiving surface of the PZT element which is particularly apt to be moistened. Moreover, since the moisture-proof coating agent for that purpose suppresses reflection and absorbs infrared rays effectively, the infrared detection sensitivity of the PZT element is greatly improved, and as a result, a highly reliable infrared detector can be provided. Of.
【図１】赤外線検出器の断面図である。FIG. 1 is a sectional view of an infrared detector.
【図２】赤外線検出器の等価回路図である。FIG. 2 is an equivalent circuit diagram of an infrared detector.
【図３】赤外線の吸収スペクトルである。FIG. 3 is an infrared absorption spectrum.
【図４】別実施例の赤外線検出器の断面図である。FIG. 4 is a sectional view of an infrared detector of another embodiment.
１…ケース、２…開口、３…赤外線透過窓、４…ステ
ム、５…リードピン、６…赤外線検出手段、11…ＰＺＴ
素子、12…フッ素系の防湿コート剤。1 ... Case, 2 ... Opening, 3 ... Infrared transmitting window, 4 ... Stem, 5 ... Lead pin, 6 ... Infrared detecting means, 11 ... PZT
Element, 12 ... Fluorine-based moistureproof coating agent.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中根 正見 京都市南区吉祥院宮の東町２番地 株式会 社堀場製作所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masami Nakane, Inventor Masami Nakane, 2 Higashi-cho, Kichijoin-miya, Minami-ku, Kyoto City
Claims (1)
すると共に、赤外線検出手段を前記ケースに内蔵し、か
つ、当該赤外線検出手段に電気的に接続されるリードピ
ンを貫設したステムにより、ケース下部側の開口を閉塞
して成る赤外線検出器において、前記赤外線検出手段の
少なくともＰＺＴ素子の受光面をフッ素系の防湿コート
剤で被覆して成ることを特徴とする赤外線検出器。1. A case, wherein an opening on the upper surface of the case is closed by an infrared transmitting window, an infrared detecting means is built in the case, and a stem is provided with a lead pin electrically connected to the infrared detecting means. An infrared detector formed by closing an opening on the lower side, wherein at least the light receiving surface of the PZT element of the infrared detecting means is coated with a fluorine-based moisture-proof coating agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24258991A JPH0552649A (en) | 1991-08-27 | 1991-08-27 | Infrared radiation detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24258991A JPH0552649A (en) | 1991-08-27 | 1991-08-27 | Infrared radiation detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0552649A true JPH0552649A (en) | 1993-03-02 |
Family
ID=17091306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24258991A Pending JPH0552649A (en) | 1991-08-27 | 1991-08-27 | Infrared radiation detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0552649A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7040806B2 (en) * | 2002-07-15 | 2006-05-09 | Ricoh Company, Ltd. | Temperature detecting unit and fixing apparatus |
| JP2007225456A (en) * | 2006-02-23 | 2007-09-06 | Matsushita Electric Works Ltd | Infrared detector |
-
1991
- 1991-08-27 JP JP24258991A patent/JPH0552649A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7040806B2 (en) * | 2002-07-15 | 2006-05-09 | Ricoh Company, Ltd. | Temperature detecting unit and fixing apparatus |
| US7363859B2 (en) | 2002-07-15 | 2008-04-29 | Ricoh Company, Ltd. | Temperature detecting unit with fixing apparatus |
| JP2007225456A (en) * | 2006-02-23 | 2007-09-06 | Matsushita Electric Works Ltd | Infrared detector |
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