JP2989203B2 - Infrared detector - Google Patents
Infrared detectorInfo
- Publication number
- JP2989203B2 JP2989203B2 JP1265387A JP26538789A JP2989203B2 JP 2989203 B2 JP2989203 B2 JP 2989203B2 JP 1265387 A JP1265387 A JP 1265387A JP 26538789 A JP26538789 A JP 26538789A JP 2989203 B2 JP2989203 B2 JP 2989203B2
- Authority
- JP
- Japan
- Prior art keywords
- infrared
- filter
- wavelength
- transmittance
- case
- 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.)
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Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は、非接触型温度検知、例えば人体検知等に利
用される熱型赤外線検出器に関し、波長−透過率が赤外
線透過とは異なる赤外線透過フィルタを、赤外線入射窓
を覆うように配置することにより、外光または周囲温度
ドリフトによる雑音電圧を低減させた赤外線検出器を提
供できるようにしたものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial application field> The present invention relates to a thermal infrared detector used for non-contact type temperature detection, for example, human body detection and the like, and an infrared ray having a wavelength-transmittance different from that of infrared ray transmission. By arranging the transmission filter so as to cover the infrared incident window, it is possible to provide an infrared detector in which noise voltage due to external light or ambient temperature drift is reduced.
＜従来の技術＞ 熱型赤外線検出器は、赤外線を熱源として利用し、そ
の発熱作用による赤外線検出素子の温度変化を検出する
方式であり、赤外線検出素子としては、焦電素子、サー
モパイル、サーミスタ等が利用されている。第４図は従
来より周知の赤外線検出器の構造を模式的に示す図であ
る。図において、１は赤外線検出素子、２は赤外線検出
素子１を収納するケース、３は底板、４は支持基板、５
及び６は端子である。<Conventional technology> A thermal infrared detector is a system that uses infrared light as a heat source and detects a temperature change of the infrared detection element due to its heat generation function. Examples of the infrared detection element include a pyroelectric element, a thermopile, and a thermistor. Is used. FIG. 4 is a diagram schematically showing the structure of a conventionally known infrared detector. In the figure, 1 is an infrared detecting element, 2 is a case for storing the infrared detecting element 1, 3 is a bottom plate, 4 is a supporting substrate, 5
And 6 are terminals.
赤外線検出素子１は、熱線のエネルギー量に応じて信
号を発生する素子であり、前述の焦電素子、サーモパイ
ル、サーミスタ等によって構成される。赤外線検出素子
１は、薄い支持基板４の上に、間隔H1を隔てて支持され
ている。支持基板４は底板３から浮かした状態で、リー
ド端子５、６上に支持されている。この種の赤外線検出
素子１は、赤外線を熱源として利用し、その発熱作用に
よる温度変化を電圧変化として検出するものであるか
ら、周囲温度による影響等を受けずに、入射赤外線によ
る温度変化をいかに感度良く検知するかが最も重要なポ
イントになる。支持基板４に対する赤外線検出素子１の
支持構造、底板３に対する支持基板４の取付構造または
各部材の材質もしくはディメンション等は、この条件に
適合するように選定され、設計される。The infrared detecting element 1 is an element that generates a signal in accordance with the amount of energy of the heat ray, and includes the above-described pyroelectric element, thermopile, thermistor, and the like. Infrared detection element 1, on a thin supporting substrate 4, and is supported at a distance H 1. The support substrate 4 is supported on the lead terminals 5 and 6 while being floated from the bottom plate 3. This type of infrared detecting element 1 uses infrared rays as a heat source and detects a temperature change due to its heat generation action as a voltage change. The most important point is to detect with good sensitivity. The support structure of the infrared detection element 1 on the support substrate 4, the mounting structure of the support substrate 4 on the bottom plate 3, the material or dimensions of each member, and the like are selected and designed so as to meet this condition.
ケース２は、赤外線検出素子１の前面に、赤外線入射
用の窓21を有し、窓21は赤外線透過フィルタとなる赤外
線透過窓部材22を備えている。赤外線検出素子１は、原
理的には全波長範囲の光を感知する。従って、検知しよ
うする対象物が特定された場合、その対象物の発する波
長を選択的に検知するフィルタ特性を付与することが必
要になる。該赤外線透過窓部材22は、上述のフィルタ特
性を得るために備えられたもので、検出しようとする対
象物の発する波長に対する選択性を有する光学的フィル
タである。人体検知の場合には、人体から生じる波長ス
ペクトル分布が、第５図に示すように数μｍ以上の領域
で相対強度が著しく増大するので、数μｍ以上の波長を
選択的に通過させるフィルタ特性を有するものによって
構成される。具体的には、シリコン、ゲルマニウム等の
基板に、誘電体を多層に蒸着した誘電体干渉膜フィルタ
が使用される。白熱灯、蛍光灯、太陽光等は、第５図に
示すように、数μｍ以下の波長であるので、赤外線透過
窓部材22によって遮断される。The case 2 has an infrared incident window 21 on the front surface of the infrared detecting element 1, and the window 21 has an infrared transmitting window member 22 serving as an infrared transmitting filter. The infrared detecting element 1 detects light in the entire wavelength range in principle. Therefore, when an object to be detected is specified, it is necessary to provide a filter characteristic for selectively detecting the wavelength emitted by the object. The infrared transmission window member 22 is provided to obtain the above-described filter characteristics, and is an optical filter having selectivity with respect to a wavelength emitted by an object to be detected. In the case of human body detection, the wavelength spectrum distribution generated from the human body, as shown in FIG. 5, the relative intensity increases remarkably in a region of several μm or more. It is constituted by what has. Specifically, a dielectric interference film filter in which a dielectric is deposited in multiple layers on a substrate such as silicon or germanium is used. As shown in FIG. 5, incandescent lamps, fluorescent lamps, sunlight and the like have a wavelength of several μm or less, and are blocked by the infrared transmitting window member 22.
＜発明が解決しようとする課題＞ しかしながら、従来の赤外線検出器は、外光が照射さ
れたときに、異常な雑音電圧を発生することがしばしば
あった。前述したように、赤外線透過窓部材22により、
特定波長外の波長を有する光は遮断されるので、このよ
うな雑音は発生しないように見える。しかし、実際に
は、赤外線透過窓部材22によって遮断される領域の波長
の光は、その光エネルギーが熱エネルギーに変化した形
で赤外線透過窓部材22に吸収されるので、赤外線透過窓
部材22の温度が上昇する。その輻射熱を赤外線検出素子
１が感知してしまうためと推測される。<Problems to be solved by the invention> However, the conventional infrared detector often generates an abnormal noise voltage when irradiated with external light. As described above, due to the infrared transmission window member 22,
Since light having a wavelength outside the specified wavelength is blocked, such noise does not appear to occur. However, in practice, light having a wavelength in a region cut off by the infrared transmitting window member 22 is absorbed by the infrared transmitting window member 22 in a form in which the light energy is changed to heat energy. The temperature rises. It is presumed that the radiant heat is detected by the infrared detecting element 1.
そこで、本発明の課題は、上述する従来の問題点を解
決し、外光による雑音電圧を抑制できるようにした赤外
線検出器を提供することである。Therefore, an object of the present invention is to provide an infrared detector that solves the above-mentioned conventional problems and can suppress a noise voltage due to external light.
＜課題を解決するための手段＞ 上述する課題を解決するため、本発明に係る赤外線検
出器は、赤外線検出素子と、前記赤外線検出素子を収納
するケースと、フィルタとを含む。前記赤外線検出素子
は、熱線のエネルギー量に応じて信号を発生する素子で
ある。前記ケースは、前記赤外線検出素子の前面に窓を
有し、前記窓は赤外線透過窓部材を備える。<Means for Solving the Problems> In order to solve the above-described problems, an infrared detector according to the present invention includes an infrared detection element, a case for housing the infrared detection element, and a filter. The infrared detection element is an element that generates a signal according to the amount of energy of the heat ray. The case has a window on a front surface of the infrared detecting element, and the window includes an infrared transmitting window member.
前記赤外線透過窓部材は、５μｍから10μｍの間の波
長領域で透過率が急激に大きくなる波長−透過率特性を
示す。前記フィルタは、少なくとも前記窓を覆うように
前記ケースの外側に配置され、約10μｍ付近の波長領域
で透過率が最大となり、波長が短くなるにつれて透過率
が次第に減衰して行き、１μｍ付近の波長領域では、透
過率が著しく小さくなる波長−透過率特性を示す。The infrared transmitting window member has a wavelength-transmittance characteristic in which the transmittance sharply increases in a wavelength region between 5 μm and 10 μm. The filter is disposed outside the case so as to cover at least the window, and the transmittance becomes maximum in a wavelength region around 10 μm, and the transmittance gradually decreases as the wavelength becomes shorter, and the wavelength around 1 μm The region shows a wavelength-transmittance characteristic in which the transmittance is significantly reduced.
＜作用＞ 赤外線透過窓部材は５μｍから10μｍの間の波長領域
で透過率が急激に大きくなる波長−透過率特性を示し、
フィルタは、赤外線透過フィルタでなり、少なくとも窓
を覆うように配置され、約10μｍ付近の波長領域で透過
率が最大となり、波長が短くなるにつれて透過率が次第
に減衰して行き、１μｍ付近の波長領域では、透過率が
著しく小さくなる波長−透過率特性を示すので、赤外線
透過窓部材の透過波長外の領域であって、外光のエネル
ギーの強い部分を、当該フィルタによって減衰できる。
赤外線透過窓部材は、減衰された外光の入射を受けるこ
ととなるので、外光による輻射エネルギーが小さくな
り、発生する雑音電圧が著しく小さくなる。<Operation> The infrared transmitting window member shows a wavelength-transmittance characteristic in which the transmittance sharply increases in a wavelength region between 5 μm and 10 μm.
The filter is an infrared transmitting filter, and is disposed so as to cover at least the window. The transmittance becomes maximum in a wavelength region around 10 μm, and the transmittance gradually decreases as the wavelength becomes shorter, and the wavelength region around 1 μm. In this case, the filter exhibits wavelength-transmittance characteristics in which the transmittance is significantly reduced, so that a region outside the transmission wavelength of the infrared transmission window member and having high external light energy can be attenuated by the filter.
Since the infrared transmitting window member receives the attenuated external light, the radiation energy due to the external light is reduced, and the generated noise voltage is significantly reduced.
更に詳しくは、フィルタは、太陽光、白熱灯及び蛍光
灯等の相対強度が最大となる１μｍ付近の波長領域で
は、透過率が著しく小さくなる。従って、太陽光、白熱
灯及び蛍光灯等に含まれる光の多くがフィルタによって
減衰を受ける。More specifically, the filter has a remarkably low transmittance in a wavelength region around 1 μm where the relative intensity of sunlight, incandescent lamps, fluorescent lamps, and the like is maximum. Therefore, much of the light contained in sunlight, incandescent lamps, fluorescent lamps and the like is attenuated by the filter.
このため、赤外線透過窓部材は、減衰された外光の入
射を受けることとなるので、赤外線透過窓部材中で熱エ
ネルギーに変換される光エネルギー量が減少し、その輻
射熱エネルギーが小さくなり、発生する雑音電圧が従来
の1/3〜1/4と著しく小さくなる。For this reason, since the infrared transmitting window member receives the attenuated external light, the amount of light energy converted into heat energy in the infrared transmitting window member decreases, the radiant heat energy decreases, and The noise voltage is significantly reduced to 1/3 to 1/4 of the conventional noise voltage.
フィルタは、ケースの外側に配置されているから、外
気と直接触れ、放熱性がよい。このため、フィルタにお
いて、光エネルギーが熱エネルギーに変化したとして
も、それによるケースの温度上昇は無視することができ
る。従って、フィルタの輻射熱を赤外線検出素子が感知
して誤った信号を出力することはない。Since the filter is disposed outside the case, it comes into direct contact with the outside air and has good heat dissipation. For this reason, even if light energy changes into heat energy in the filter, the temperature rise in the case due to the change can be ignored. Therefore, the radiant heat of the filter is not detected by the infrared detecting element and an erroneous signal is not output.
＜実施例＞ 第１図は本発明に係る赤外線検出器の正面部分断面図
である。図において、第４図と同一の参照符号は同一性
ある構成部分を示している。７はフィルタである。フィ
ルタ７は、波長−透過率特性が赤外線透過窓部材22とは
異なる赤外線透過フィルタでなり、少なくとも窓21を覆
うように、ケース２の外側に配置されている。入射する
外光のうち、赤外線透過窓部材22の透過波長以外の領域
にあって、エネルギーの強い部分は、このフィルタ７に
よる減衰を受ける。<Embodiment> Fig. 1 is a front partial sectional view of an infrared detector according to the present invention. In the figure, the same reference numerals as those in FIG. 4 indicate identical components. 7 is a filter. The filter 7 is an infrared transmission filter having a wavelength-transmittance characteristic different from that of the infrared transmission window member 22, and is disposed outside the case 2 so as to cover at least the window 21. Of the incident external light, a portion having a high energy in a region other than the transmission wavelength of the infrared transmission window member 22 is attenuated by the filter 7.
第２図はフィルタ７と赤外線透過窓部材22の波長−透
過率特性の１例を示す図で、特性L1はフィルタ７の透過
率特性、特性L2は赤外線透過窓部材22の透過率特性を示
している。図示するように、赤外線透過窓部材22は５μ
ｍ以上の波長領域で、高い透過率を示しているが、フィ
ルタ７の透過率特性L2は約10μｍ付近の波長で最大とな
り、５μｍ以下の波長領域まで、透過率が次第に減衰し
てゆく。太陽光、白熱灯及び蛍光灯等の相対強度が最大
となる１μｍ付近の波長領域（第５図参照）では、透過
率が著しく小さくなっている。従って、太陽光、白熱灯
及び蛍光灯等に含まれる光の多くがフィルタ７によって
減衰を受ける。Wavelength of FIG. 2 the filter 7 and the infrared transmission window member 22 - a diagram showing an example of the transmittance characteristic, transmittance characteristics of the characteristic L 1 is the transmittance characteristics of the filter 7, characteristic L 2 is the infrared transmission window member 22 Is shown. As shown in FIG.
In m or more wavelength regions, while indicating a high transmittance, the transmittance characteristic L 2 of the filter 7 becomes maximum at a wavelength of about 10μm vicinity, 5 [mu] m to a wavelength region, transmittance slide into attenuated gradually. In a wavelength region near 1 μm (see FIG. 5) where the relative intensity of sunlight, incandescent lamps, fluorescent lamps, and the like is maximum, the transmittance is extremely small. Therefore, much of the light contained in sunlight, incandescent lamps, fluorescent lamps and the like is attenuated by the filter 7.
このため、赤外線透過窓部材22は、減衰された外光の
入射を受けることとなるので、赤外線透過窓部材22中で
熱エネルギーに変換される光エネルギー量が減少し、そ
の輻射熱エネルギーが小さくなり、発生する雑音電圧が
従来の1/3〜1/4と著しく小さくなる。For this reason, since the infrared transmitting window member 22 receives the attenuated external light, the amount of light energy converted into thermal energy in the infrared transmitting window member 22 decreases, and the radiant heat energy decreases. The generated noise voltage is significantly reduced to 1/3 to 1/4 of the conventional level.
しかも、フィルタ７は、ケース２の外側に配置されて
いるから、外気と直接触れ、放熱性がよい。このため、
フィルタ７において、光エネルギーが熱エネルギーに変
化したとしても、それによるケース２の温度上昇は無視
することができる。従って、フィルタ７の輻射熱を赤外
線検出素子７が感知して誤った信号を出力することはな
い。In addition, since the filter 7 is disposed outside the case 2, the filter 7 comes into direct contact with the outside air and has good heat radiation. For this reason,
In the filter 7, even if the light energy is changed to the heat energy, the temperature rise of the case 2 due to the change can be ignored. Therefore, there is no possibility that the radiant heat of the filter 7 is detected by the infrared detecting element 7 and an erroneous signal is output.
フィルタ７は、ポリエチレン樹脂等を主成分とする樹
脂系フィルタによって構成できる。その１例として、特
開昭61−39001号公報に開示される如く、ポリエチレン
樹脂に対してある種の無機顔料を所定量含有させたもの
等をあげることができる。樹脂系フィルタ材料は、誘電
体干渉膜フィルタでなる赤外線透過窓部材22よりも、コ
スト的に有利であり、また、柔軟性及び加工性に富むと
いう利点がある。The filter 7 can be constituted by a resin filter mainly composed of a polyethylene resin or the like. As one example, as disclosed in JP-A-61-39001, a resin in which a certain amount of a certain inorganic pigment is contained in a polyethylene resin can be cited. The resin-based filter material is more cost-effective than the infrared-transmitting window member 22 made of a dielectric interference film filter, and has the advantage of being rich in flexibility and workability.
実施例において、フィルタ７はキャップ状となってお
り、ケース２の外面を覆うように、ケース２に装着され
ている。これにより、フィルタ７が一種の断熱材として
作用するようになるので、ケース２内にある赤外線検出
素子１が、周囲温度変動による影響を受けにくくなり、
周囲温度変動による雑音電圧が小さくなる。特に、フィ
ルタ７を樹脂を主成分とする赤外線透過材によってキャ
ップ状に構成した場合には、この作用効果がきわめて顕
著である。In the embodiment, the filter 7 has a cap shape and is mounted on the case 2 so as to cover the outer surface of the case 2. As a result, the filter 7 acts as a kind of heat insulating material, so that the infrared detecting element 1 in the case 2 is hardly affected by the ambient temperature fluctuation,
Noise voltage due to fluctuations in ambient temperature is reduced. In particular, when the filter 7 is formed in a cap shape using an infrared transmitting material mainly composed of a resin, this effect is remarkable.
しかも、フィルタ７は、ケース２の外側に配置されて
いるから、外気と直接触れ、放熱性がよい。このため、
フィルタ７において、光エネルギーが熱エネルギーに変
化したとしても、それによるケース２の温度上昇は無視
することができる。従って、フィルタ７の輻射熱を赤外
線検出素子７が感知して誤った信号を出力することはな
い。In addition, since the filter 7 is disposed outside the case 2, the filter 7 comes into direct contact with the outside air and has good heat radiation. For this reason,
In the filter 7, even if the light energy is changed to the heat energy, the temperature rise of the case 2 due to the change can be ignored. Therefore, there is no possibility that the radiant heat of the filter 7 is detected by the infrared detecting element 7 and an erroneous signal is output.
第３図のデータはエアコンデショナーのない会議室内
での温度変化及び空気対流による雑音電圧の変化を示し
ている。第３図において、横軸に時間軸をとり、縦軸に
雑音の大きさ（相対値）をとってある。特性A1は本発明
に係る赤外線検出器の特性、B1は従来（第４図参照）の
赤外線検出器の特性である。The data in FIG. 3 shows a change in temperature in a conference room without an air conditioner and a change in noise voltage due to air convection. In FIG. 3, the horizontal axis is the time axis, and the vertical axis is the noise magnitude (relative value). Characteristics of the infrared detector characteristic A 1 is according to the present invention, B 1 is a characteristic of the infrared detector of conventional (see FIG. 4).
第３図のデータに示される如く、従来の赤外線検出器
は、その周囲の温度変化（１℃以下）、風の影響によっ
て大きな雑音電圧を発生しているが、本発明に係る赤外
線検出器は、雑音電圧が著しく低減されていることが分
る。As shown in the data of FIG. 3, the conventional infrared detector generates a large noise voltage due to a change in ambient temperature (1 ° C. or less) and the influence of wind. It can be seen that the noise voltage has been significantly reduced.
フィルタ７をキャップ状に形成した場合には、フィル
タ７は、ケース２に対して非接着状態で装着する。こう
すると、接着剤塗布等の面倒な工程が不要になり、組立
が容易になる。When the filter 7 is formed in a cap shape, the filter 7 is attached to the case 2 in a non-adhered state. This eliminates the need for a troublesome process such as application of an adhesive and facilitates assembly.
また、フィルタ７は、ケース２の筒部23を覆う部分71
の厚みをt1とし、赤外線透過用赤外線透過窓部材22を取
付けた面24を覆う部分72の厚みをt2とした場合、t1＞t2
のように選定する。このような関係に設定すると、透過
赤外線に対する減衰量を小さくしながら、周囲温度に対
する断熱作用を確保できる。Further, the filter 7 includes a portion 71 covering the cylindrical portion 23 of the case 2.
If the thickness and t 1, the thickness of the portion 72 covering the surface 24 fitted with infrared transparent for infrared transmission window member 22 was set to t 2, t 1> t 2
Select as follows. By setting such a relationship, it is possible to secure the heat insulating effect with respect to the ambient temperature while reducing the amount of attenuation with respect to transmitted infrared rays.
＜発明の効果＞ 以上述べたように、本発明に係る赤外線検出器は、赤
外線透過窓部材は５μｍから10μｍの間の波長領域で透
過率が急激に大きくなる波長−透過率特性を示し、フィ
ルタは、赤外線透過フィルタでなり、少なくとも窓を覆
うように配置され、約10μｍ付近の波長領域で透過率が
最大となり、波長が短くなるにつれて透過率が次第に減
衰して行き、１μｍ付近の波長領域では、透過率が著し
く小さくなる波長−透過率特性を示すので、赤外線透過
窓部材の透過波長外の領域であって、外光のエネルギー
の強い部分を、当該フィルタによって減衰させ、外光に
よる赤外線透過窓部材の輻射エネルギーを低減させ、雑
音電圧を著しく小さくした赤外線検出器を提供できる。<Effects of the Invention> As described above, in the infrared detector according to the present invention, the infrared transmission window member exhibits a wavelength-transmittance characteristic in which the transmittance sharply increases in a wavelength region between 5 μm and 10 μm. Is an infrared transmitting filter, which is arranged so as to cover at least the window, the transmittance becomes maximum in a wavelength region around 10 μm, and the transmittance gradually decreases as the wavelength becomes shorter, and in a wavelength region around 1 μm, Since the wavelength-transmittance characteristic at which the transmittance is significantly reduced is shown, the region outside the transmission wavelength of the infrared transmission window member, where the energy of the external light is strong, is attenuated by the filter, and the infrared light is transmitted by the external light. An infrared detector in which the radiation energy of the window member is reduced and the noise voltage is significantly reduced can be provided.
第１図は本発明に係る赤外線検出器の正面部分断面図、
第２図は波長−透過率特性を示す図、第３図は周囲温度
変動に対する雑音電圧の変化を示すデータ、第４図は従
来の赤外線検出器の正面部分断面図、第５図は各種外光
及び人体の放射す波長スペクトル分布を示す図である。 １……赤外線検出素子 ２……ケース、21……窓 22……赤外線透過窓部材 ７……フィルタFIG. 1 is a front partial cross-sectional view of an infrared detector according to the present invention,
FIG. 2 is a diagram showing wavelength-transmittance characteristics, FIG. 3 is data showing a change in noise voltage with respect to ambient temperature fluctuation, FIG. 4 is a front partial cross-sectional view of a conventional infrared detector, and FIG. It is a figure which shows the light and the wavelength spectrum distribution which a human body radiates. DESCRIPTION OF SYMBOLS 1 ... Infrared detecting element 2 ... Case, 21 ... Window 22 ... Infrared transmitting window member 7 ... Filter
フロントページの続き (56)参考文献 特開 昭62−261025（ＪＰ，Ａ) 特開 平１−48637（ＪＰ，Ａ) 実開 平３−51333（ＪＰ，Ｕ) 実開 平４−1419（ＪＰ，Ｕ) 実開 平２−59447（ＪＰ，Ｕ) 実開 平２−59448（ＪＰ，Ｕ) 特公 昭49−43992（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.6，ＤＢ名) G01J 1/02 - 1/04 G01J 5/02 G01V 9/04 Continuation of the front page (56) References JP-A-62-261025 (JP, A) JP-A-1-48637 (JP, A) JP-A-3-51333 (JP, U) JP-A-4-1419 (JP) , U) Japanese Utility Model Application Hei 2-59447 (JP, U) Japanese Utility Model Application Hei 2-59448 (JP, U) Japanese Patent Publication No. 49-43992 (JP, B2) (58) Fields surveyed (Int. Cl. 6 , DB G01J 1/02-1/04 G01J 5/02 G01V 9/04
Claims (3)
収納するケースと、フィルタとを含む赤外線検出器であ
って、 前記赤外線検出素子は、熱線のエネルギー量に応じて信
号を発生する素子であり、 前記ケースは、前記赤外線検出素子の前面に窓を有し、
前記窓は赤外線透過窓部材を備えており、 前記赤外線透過窓部材は、５μｍから10μｍの間の波長
領域で透過率が急激に大きくなる波長−透過率特性を示
し、 前記フィルタは、少なくとも前記窓を覆うように、前記
ケースの外側に配置され、約10μｍ付近の波長領域で透
過率が最大となり、波長が短くなるにつれて透過率が次
第に減衰し、１μｍ付近の波長領域では、透過率が著し
く小さくなる波長−透過率特性を示す 赤外線検出器。1. An infrared detector comprising an infrared detector, a case accommodating the infrared detector, and a filter, wherein the infrared detector is a device that generates a signal according to the amount of energy of a heat ray. In the case, the case has a window in front of the infrared detection element,
The window includes an infrared transmitting window member, wherein the infrared transmitting window member has a wavelength-transmittance characteristic in which a transmittance increases sharply in a wavelength region between 5 μm and 10 μm, and the filter includes at least the window. Is disposed outside the case so that the transmittance is maximum in a wavelength region around 10 μm, the transmittance gradually decreases as the wavelength becomes shorter, and in a wavelength region around 1 μm, the transmittance is extremely small. An infrared detector showing a wavelength-transmittance characteristic.
ケースの外面を覆うように前記ケースに装着されている
こと を特徴とする請求項１に記載の赤外線検出器。2. The infrared detector according to claim 1, wherein the filter has a cap shape and is attached to the case so as to cover an outer surface of the case.
出器。3. The infrared detector according to claim 1, wherein the filter contains resin as a main component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1265387A JP2989203B2 (en) | 1989-10-12 | 1989-10-12 | Infrared detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1265387A JP2989203B2 (en) | 1989-10-12 | 1989-10-12 | Infrared detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03125934A JPH03125934A (en) | 1991-05-29 |
| JP2989203B2 true JP2989203B2 (en) | 1999-12-13 |
Family
ID=17416471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1265387A Expired - Lifetime JP2989203B2 (en) | 1989-10-12 | 1989-10-12 | Infrared detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2989203B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04269635A (en) * | 1991-02-25 | 1992-09-25 | Matsushita Electric Works Ltd | Hot-wire type detector |
| JP2001304956A (en) * | 2000-04-25 | 2001-10-31 | Matsushita Electric Works Ltd | Heat ray sensor and automatic switch comprising it |
| JP2006098372A (en) * | 2004-09-30 | 2006-04-13 | Nohmi Bosai Ltd | Flame detector |
| JP5260859B2 (en) * | 2006-11-22 | 2013-08-14 | パナソニック株式会社 | Infrared detector |
| JP6976045B2 (en) | 2016-07-20 | 2021-12-01 | 株式会社トーキン | Pyroelectric infrared sensor device |
-
1989
- 1989-10-12 JP JP1265387A patent/JP2989203B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03125934A (en) | 1991-05-29 |
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