JP2008268052A - Infrared sensor - Google Patents

Infrared sensor Download PDF

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JP2008268052A
JP2008268052A JP2007112737A JP2007112737A JP2008268052A JP 2008268052 A JP2008268052 A JP 2008268052A JP 2007112737 A JP2007112737 A JP 2007112737A JP 2007112737 A JP2007112737 A JP 2007112737A JP 2008268052 A JP2008268052 A JP 2008268052A
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infrared
infrared sensor
case body
detection
lens
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JP4849003B2 (en
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Tadashi Murakami
忠 村上
Juichi Kawashima
寿一 川島
Shigeo Goshima
成夫 五島
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To detect an object by accurately classifying a plurality of infrared detecting sections having different detection areas for each detection area, in an infrared sensor having the infrared detecting sections. <P>SOLUTION: This infrared sensor 1 includes a case body 3 including two pyroelectric elements 2a and 2b (infrared detecting sections) into which infrared radiations Ra and Rb from detection areas A and B come, and a cap lens 4 having two lens sections 6a and 6b for condensing the infrared radiations to the two pyroelectric elements 2a and 2b. Rectangular window sections 3a and 3b are opened in the top surface of the case body 3, and a bridge part 3c between the window sections 3a and 3b constitutes an infrared shielding member by itself. Partial infrared radiation Rr that does not travel in an appropriate direction among the infrared radiations having come into the cap lens 4 is absorbed without being reflected by the bridge part 3c (infrared shielding member) of the case body 3, and does not reach the pyroelectric elements 2a and 2b. The existence of the object for each of the detection areas A and B can be detected accurately based on the detection output of the pyroelectric elements 2a and 2b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、検知エリアの異なる複数の赤外線検出部を持つ多出力型の赤外線センサに関する。   The present invention relates to a multi-output infrared sensor having a plurality of infrared detection units having different detection areas.

複数の赤外線検出部を持ち、各赤外線検出部が異なった検知エリアからの赤外線を検出して検知エリア別に人間等の対象物が存在するか否かを検知する赤外線センサが知られている（例えば、特許文献１参照）。特許文献１に記載の赤外線センサでは、赤外線センサが壁面に取付けられて上下に区分された検知エリアを有し、各検知エリアにおける対象物の検知状況の組合せによって人間と犬等の小動物とを区別して検知できるように構成されている。   There is known an infrared sensor having a plurality of infrared detection units, and each infrared detection unit detects infrared rays from different detection areas and detects whether or not an object such as a human exists in each detection area (for example, , See Patent Document 1). In the infrared sensor described in Patent Document 1, the infrared sensor is attached to a wall surface and has a detection area divided into upper and lower parts, and a human and a small animal such as a dog are distinguished by a combination of detection states of objects in each detection area. It is configured to be detected separately.

上下に区分された検知エリアを有する赤外線センサにおいて、大きさの異なる対象物を検知する原理について、図１１を参照して説明する。赤外線センサ１００の検知エリアは、赤外線センサ１００が備える集光レンズの配光特性によって規定され、各検知エリアＡ、Ｂに進入した対象物から発せられた赤外線Ｒａ、Ｒｂは、赤外線センサ１００内の別々の赤外線検出部Ｓａ、Ｓｂに入射して、各検知エリアＡ、Ｂに進入した対象物が区別して検知される。赤外線センサ１００が検知エリアＡ、Ｂの両方のエリアで対象物を検知した場合には、所定位置に比較的大きい対象物（人間Ｐ）が居ることが検知され、赤外線センサ１００が検知エリアＢでのみ対象物を検知した場合には、所定位置に比較的小さい対象物（犬Ｄ等の小動物）が居ることが検知される。   The principle of detecting objects of different sizes in an infrared sensor having detection areas divided into upper and lower parts will be described with reference to FIG. The detection area of the infrared sensor 100 is defined by the light distribution characteristics of the condensing lens provided in the infrared sensor 100, and the infrared rays Ra and Rb emitted from the objects entering the detection areas A and B are included in the infrared sensor 100. The objects that have entered the separate infrared detection units Sa and Sb and entered the detection areas A and B are distinguished and detected. When the infrared sensor 100 detects an object in both the detection areas A and B, it is detected that there is a relatively large object (human P) at a predetermined position, and the infrared sensor 100 is detected in the detection area B. When only the object is detected, it is detected that there is a relatively small object (small animal such as dog D) at a predetermined position.

一方、カメラの自動調光制御装置において、閃光発光器による閃光が受光素子に直接入射しないように受光素子の入射側に遮光マスクが配置されたものが知られている（例えば、特許文献２参照）。
特開平６−２６９２８号公報 実開平５−８５４６号公報 On the other hand, an automatic light control device for a camera is known in which a light-shielding mask is arranged on the incident side of a light receiving element so that flash light from a flash light emitter does not directly enter the light receiving element (see, for example, Patent Document 2). ).
JP-A-6-26928 Japanese Utility Model Publication No. 5-8546

上記のように複数の検知エリアを持つ赤外線センサ１００においては、各検知エリアＡ、Ｂに存在する対象物から発せられた赤外線Ｒａ、Ｒｂが集光レンズにより赤外線センサ１００内に集光されて、別々の赤外線検出部Ｓａ、Ｓｂに入射することによって検知エリアＡ、Ｂ毎に区別した対象物の検知が行われるが、実際には赤外線センサ１００内に入射した赤外線の進行方向は一律ではなく、一部の赤外線は赤外線センサ１００内に入射した後に不適正な方向へ進行することから（一般的に回り込みと言われる現象）、検知エリアＡ、Ｂ毎に整然と区別した対象物の検知を行うことは難しいという問題がある。   In the infrared sensor 100 having a plurality of detection areas as described above, infrared rays Ra and Rb emitted from objects existing in the detection areas A and B are condensed in the infrared sensor 100 by the condenser lens, Although the detection of the object distinguished for each of the detection areas A and B is performed by entering the separate infrared detection units Sa and Sb, the traveling direction of the infrared light that is actually incident in the infrared sensor 100 is not uniform. Since some infrared rays travel in an inappropriate direction after entering the infrared sensor 100 (a phenomenon generally referred to as wraparound), detection of an object is neatly distinguished for each of the detection areas A and B. There is a problem that is difficult.

例えば、図１１に示された例では、検知エリアＢに犬Ｄが存在する場合に犬Ｄから発せられた赤外線Ｒｂが赤外線センサ１００の赤外線検出部Ｓｂに入射すると共に、赤外線Ｒｂの一部が回り込み現象によって赤外線検出部Ｓａにも入射し、両方の赤外線検出部Ｓａ、Ｓｂから検出出力が生じて、実際には犬Ｄが存在するにも係わらず人間Ｐが存在するとして誤検知する不具合が生じる虞がある。   For example, in the example shown in FIG. 11, when the dog D exists in the detection area B, the infrared ray Rb emitted from the dog D enters the infrared detection unit Sb of the infrared sensor 100 and a part of the infrared ray Rb is included. Due to the wraparound phenomenon, it also enters the infrared detection unit Sa, and detection outputs are generated from both infrared detection units Sa and Sb. May occur.

なお、特許文献２に記載されたカメラの自動調光制御装置では、迷光が適正ではない受光素子に入らないように受光素子の入射側に遮光マスクが配置されているが、自動調光制御装置が取付けられるのはカメラであって赤外線センサではない上に、遮光マスクが塗料又はフィルムによって形成されていることから機械的強度が低いという欠点を有している。   In the automatic light control device for a camera described in Patent Document 2, a light-shielding mask is disposed on the incident side of the light receiving element so that stray light does not enter an inappropriate light receiving device. Is attached to a camera, not an infrared sensor, and has a disadvantage that its mechanical strength is low because the light-shielding mask is formed of paint or film.

そこで、本発明は、検知エリアの異なる複数の赤外線検出部を持つ多出力型の赤外線センサにおいて、所定の検知エリアから赤外線センサ内に入射した赤外線が回り込み現象によって適正な赤外線検出部以外の赤外線検出部に入射することを防止することによって高い精度で検知エリア毎に区別して対象物を検知することができ、かつ機械的強度が高い赤外線センサを提供することを目的とする。   Accordingly, the present invention provides a multi-output type infrared sensor having a plurality of infrared detection units having different detection areas, and detects infrared rays other than the proper infrared detection unit due to the sneak phenomenon of the infrared rays that have entered the infrared sensor from a predetermined detection area. An object of the present invention is to provide an infrared sensor that can detect a target object with high accuracy and can have a high mechanical strength by preventing the light from entering the part.

上記目的を達成するために、請求項１の発明は、検知エリアの異なる複数の赤外線検出部を持つ多出力型の赤外線センサにおいて、前記赤外線検出部に光を集光する集光レンズと、前記赤外線検出部を覆い、かつ該赤外線検出部と集光レンズとの位置関係を規定するケース体と、を備え、前記ケース体は、前記集光レンズと赤外線検出部との間に位置して個々の赤外線検出部同士を区切る赤外線遮蔽部材を持つことを特徴とする。   In order to achieve the above object, the invention of claim 1 is a multi-output type infrared sensor having a plurality of infrared detection units having different detection areas, and a condensing lens for condensing light on the infrared detection unit; A case body that covers the infrared detection unit and defines a positional relationship between the infrared detection unit and the condensing lens, and the case body is located between the condensing lens and the infrared detection unit, It has the infrared shielding member which divides each infrared detection part.

請求項１の発明によれば、個々の赤外線検出部同士を区切る赤外線遮蔽部材を設けたので、赤外線センサ内に入射した赤外線が回り込み現象によって適正ではない赤外線検出部に入射することを防ぐことができ、従って、高い精度で検知エリア毎に区別して対象物を検知することができる。また、機械的強度が高い赤外線センサが得られる。   According to the first aspect of the present invention, since the infrared ray shielding member that separates the individual infrared ray detection units is provided, it is possible to prevent the infrared ray that has entered the infrared sensor from entering the infrared ray detection unit that is not appropriate due to the wraparound phenomenon. Therefore, it is possible to detect the object by distinguishing each detection area with high accuracy. In addition, an infrared sensor having high mechanical strength can be obtained.

（第１の実施形態）
本発明の第１の実施形態に係る赤外線センサについて、図１乃至図５を参照して説明する。本実施形態の赤外線センサ１は、図１に示されるように、検知エリアＡ、Ｂからの赤外線Ｒａ、Ｒｂが入射する２つの赤外線検出部としての焦電素子２ａ、２ｂを内部に有するケース体３と、２つの焦電素子２ａ、２ｂに赤外線を集光する２つのレンズ部６ａ、６ｂ（集光レンズ）を有するキャップレンズ４と、を備える。なお、図２（ａ）、（ｂ）は、キャップレンズ４とケース体３が組み立てられる前の個別の態様を示すものである。また、検知エリアＡ、Ｂは、例えば、赤外線センサ１が図１１に示されるように、壁面に横向きに取付けられる場合には上下に分かれて形成され、比較的大きな対象物（例えば、人間）は、検知エリアＡ、Ｂの両方において検知され、比較的小さな対象物（例えば、犬等の小動物）は、いずれか一方の検知エリアにおいて検知されるように設定される。 (First embodiment)
An infrared sensor according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the infrared sensor 1 according to the present embodiment includes a case body having pyroelectric elements 2 a and 2 b as two infrared detection units on which infrared rays Ra and Rb from detection areas A and B are incident. 3 and a cap lens 4 having two lens portions 6a and 6b (condensing lenses) for condensing infrared rays on the two pyroelectric elements 2a and 2b. 2A and 2B show individual modes before the cap lens 4 and the case body 3 are assembled. In addition, the detection areas A and B are formed, for example, when the infrared sensor 1 is mounted sideways on the wall as shown in FIG. 11, and a relatively large object (for example, a human) is formed. Detection is performed in both detection areas A and B, and a relatively small object (for example, a small animal such as a dog) is set to be detected in either one of the detection areas.

ケース体３は円筒形状であり、上面には２つの焦電素子２ａ、２ｂに対向する位置に長方形の窓部３ａ、３ｂが開けられ（図３参照）、窓部３ａ、３ｂの下方に赤外線透過フィルタ５が設けられている。本実施形態では、窓部３ａ、３ｂ同士の間のブリッジ部分３ｃ自体が赤外線遮蔽部材を構成する。ケース体３は、例えばカーボンブラック等の顔料をアクリル樹脂やＡＢＳ樹脂に分散させたものの表面をサンドブラスト処理することによって形成されており、赤外線がケース体３の表面で反射しない材質によって形成されている。ケース体３の材質は、黒色に着色されたプラスチックであって、表面につやが生じないように粗面処理されたものであってもよい。   The case body 3 has a cylindrical shape, and rectangular windows 3a and 3b are opened on the upper surface at positions facing the two pyroelectric elements 2a and 2b (see FIG. 3), and infrared rays are formed below the windows 3a and 3b. A transmission filter 5 is provided. In the present embodiment, the bridge portion 3c itself between the window portions 3a and 3b constitutes an infrared shielding member. The case body 3 is formed, for example, by sandblasting the surface of a pigment such as carbon black dispersed in acrylic resin or ABS resin, and is formed of a material that does not reflect infrared rays on the surface of the case body 3. . The material of the case body 3 may be a plastic that is colored black and has been subjected to a rough surface treatment so that the surface is not glossy.

２つの焦電素子２ａ、２ｂは、ケース体３の底面から出力端子１２を下方へ突出するようにして固定され、図４に示されるように、それぞれ極性の異なる２つの素子部２ａａ、２ａｂ、２ｂａ、２ｂｂを有している。各素子部２ａａ、２ａｂ、２ｂａ、２ｂｂは、図５に示されるように、電界効果トランジスタ１３、１４、及びゲート抵抗１５、１６に接続されている。   The two pyroelectric elements 2a and 2b are fixed so that the output terminal 12 protrudes downward from the bottom surface of the case body 3, and as shown in FIG. 4, two element parts 2aa, 2ab, 2ba, 2bb. Each element part 2aa, 2ab, 2ba, 2bb is connected to the field effect transistors 13, 14 and the gate resistors 15, 16 as shown in FIG.

キャップレンズ４は、ドーム状の上部４ａが光透過性の樹脂材料から構成され、ケース体３の外周に嵌合する円筒形状の下部４ｂが光不透過性の樹脂材料から構成されており、ドーム状の上部４ａに所定の配光特性を有するレンズ部６ａ、６ｂが形成されている。   The cap lens 4 has a dome-shaped upper part 4a made of a light-transmitting resin material, and a cylindrical lower part 4b fitted to the outer periphery of the case body 3 is made of a light-impermeable resin material. Lens portions 6a and 6b having predetermined light distribution characteristics are formed on the upper portion 4a.

次に、本実施形態の赤外線センサ１の検知動作について、図１を参照して説明する。検知エリアＡ、Ｂからの赤外線Ｒａ、Ｒｂは、それぞれレンズ部６ａ、６ｂによって集光され、キャップレンズ４の内部空間Ｓ、窓部３ａ、３ｂ、及び赤外線透過フィルタ５を通って各焦電素子２ａ、２ｂへ入射する。従って、焦電素子２ａから検知出力が発生するときには、検知エリアＡに赤外線を放出する対象物が存在することが検出され、焦電素子２ｂから検知出力が発生するときには、検知エリアＢに赤外線を放出する対象物が存在することが検出される。   Next, the detection operation of the infrared sensor 1 of the present embodiment will be described with reference to FIG. Infrared rays Ra and Rb from the detection areas A and B are collected by the lens portions 6 a and 6 b, and pass through the internal space S of the cap lens 4, the window portions 3 a and 3 b, and the infrared transmission filter 5. Incident to 2a and 2b. Therefore, when a detection output is generated from the pyroelectric element 2a, it is detected that there is an object that emits infrared rays in the detection area A, and when a detection output is generated from the pyroelectric element 2b, infrared rays are output to the detection area B. It is detected that there is an object to be emitted.

一方、検知エリアＢからドーム状の上部４ａを透過してキャップレンズ４内に進入した赤外線のうち一部の赤外線Ｒｒは、適正に対応する焦電素子２ｂの方向へは進行せず、焦電素子２ａの方向へ進行するが、この赤外線Ｒｒは、窓部３ａ、３ｂ同士の間のブリッジ部分３ｃ（赤外線遮蔽部材）によって反射することなく吸収され、焦電素子２ａへは到達しない。同様に、検知エリアＡからキャップレンズ４内に進入した赤外線のうち進行方向が適正ではなく焦電素子２ｂの方向へ進行する赤外線も窓部３ａ、３ｂ同士の間のブリッジ部分３ｃ（赤外線遮蔽部材）によって反射することなく吸収され、焦電素子２ａへは到達しない。従って、キャップレンズ４内に入射した赤外線の一部が適正ではない方の焦電素子２ａ、２ｂに入射することが防止され、高い精度で検知エリアＡ、Ｂ別の対象物の存在を検知することができる。また、赤外線遮蔽部３ｃがケース体３自体によって構成されるので、フィルムや塗料によって形成される場合に比べて機械的強度が高い。   On the other hand, some of the infrared rays Rr that have passed through the dome-shaped upper portion 4a from the detection area B and entered the cap lens 4 do not travel in the direction of the corresponding pyroelectric element 2b. Although traveling in the direction of the element 2a, the infrared ray Rr is absorbed without being reflected by the bridge portion 3c (infrared shielding member) between the window portions 3a and 3b, and does not reach the pyroelectric element 2a. Similarly, of the infrared rays that have entered the cap lens 4 from the detection area A, the infrared rays that travel in the direction of the pyroelectric element 2b are not suitable for the bridge portion 3c (infrared shielding member) between the windows 3a and 3b. ) And is not reflected and does not reach the pyroelectric element 2a. Accordingly, it is possible to prevent a part of the infrared rays entering the cap lens 4 from entering the pyroelectric elements 2a and 2b, which are not appropriate, and detect the presence of the objects in the detection areas A and B with high accuracy. be able to. Moreover, since the infrared shielding part 3c is comprised by case body 3 itself, mechanical strength is high compared with the case where it forms with a film or a coating material.

（第２の実施形態）
本発明の第２の実施形態に係る赤外線センサについて、図６及び図７を参照して説明する。第２の実施形態に係る赤外線センサ１は、第１の実施形態に係る赤外線センサ１とほぼ同一の構造であり、異なるところは、赤外線遮蔽部材が、第１の実施形態ではケース体３のブリッジ部分３ｃによって構成されていたが、第２の実施形態ではケース体３とは別部材の板状部材によって構成されている点である。第１の実施形態の赤外線センサ１と同一部分については、同一の番号を付して説明を省略する。 (Second Embodiment)
An infrared sensor according to a second embodiment of the present invention will be described with reference to FIGS. The infrared sensor 1 according to the second embodiment has substantially the same structure as the infrared sensor 1 according to the first embodiment, except that the infrared shielding member is a bridge of the case body 3 in the first embodiment. Although comprised by the part 3c, it is the point comprised by the plate-shaped member different from the case body 3 in 2nd Embodiment. About the same part as the infrared sensor 1 of 1st Embodiment, the same number is attached | subjected and description is abbreviate | omitted.

第２の実施形態の赤外線センサ１におけるケース体３の上面には、平面視において２つの焦電素子２ａ、２ｂを共に臨む１つの窓部３ｄが開けられ（図７参照）、この窓部３ｄの中央に、窓部３ｄを両側２つの窓部３ｅ、３ｆに画成するようにして板状部材２１（赤外線遮蔽部材）が固定されている。板状部材２１は、板状部材２１の下面が赤外線透過フィルタ５に接着剤によって固定されてもよいし、板状部材２１の両端が窓部３ｄの縁部に接着剤によって固定されてもよい。   On the upper surface of the case body 3 in the infrared sensor 1 of the second embodiment, one window 3d facing both the two pyroelectric elements 2a and 2b in plan view is opened (see FIG. 7), and this window 3d. A plate-like member 21 (infrared shielding member) is fixed at the center so that the window 3d is defined by two windows 3e and 3f on both sides. The plate-like member 21 may have the lower surface of the plate-like member 21 fixed to the infrared transmission filter 5 with an adhesive, or both ends of the plate-like member 21 may be fixed to the edge of the window portion 3d with an adhesive. .

また、板状部材２１の材質は、第１の実施形態におけるケース体３と同様に、例えばカーボンブラック等の顔料をアクリル樹脂やＡＢＳ樹脂に分散させたものの表面をサンドブラスト処理することによって形成されたものであり、黒色に着色されたプラスチックであって、表面につやが生じないように粗面処理されたものであってもよい。   Further, the material of the plate-like member 21 is formed by sandblasting the surface of a material in which a pigment such as carbon black is dispersed in acrylic resin or ABS resin, as in the case body 3 in the first embodiment. It may be a plastic that is colored black and has been subjected to a rough surface treatment so that the surface does not become glossy.

本実施形態の赤外線センサ１による検知動作は、第１の実施形態の赤外線センサ１と同様である。具体的には、検知エリアＡ、Ｂからキャップレンズ４内に進入した赤外線のうち進行方向が適正な焦電素子２ａ、２ｂの方向へ進行しない一部の赤外線Ｒｒは、窓部３ｄの中央に固定された板状部材２１（赤外線遮蔽部材）によって反射することなく吸収され、焦電素子２ａ、２ｂへは到達しない。従って、本実施形態の赤外線センサ１においても、高い精度で検知エリアＡ、Ｂ別に対象物の存在を検知することができる。また、接着剤等によってケース体３に固定された板状部材２１（赤外線遮蔽部材）は、フィルムや塗料によって形成される場合に比べて機械的強度が高い。   The detection operation by the infrared sensor 1 of the present embodiment is the same as that of the infrared sensor 1 of the first embodiment. Specifically, some infrared rays Rr that do not travel in the direction of the pyroelectric elements 2a and 2b whose traveling directions are appropriate from the infrared rays that have entered the cap lens 4 from the detection areas A and B are in the center of the window 3d. The light is absorbed without being reflected by the fixed plate-like member 21 (infrared shielding member) and does not reach the pyroelectric elements 2a and 2b. Therefore, also in the infrared sensor 1 of the present embodiment, it is possible to detect the presence of an object for each of the detection areas A and B with high accuracy. Further, the plate-like member 21 (infrared shielding member) fixed to the case body 3 with an adhesive or the like has higher mechanical strength than the case where it is formed with a film or paint.

（第３の実施形態）
本発明の第３の実施形態に係る赤外線センサについて、図８乃至図１０を参照して説明する。第３の実施形態に係る赤外線センサ１は、第１の実施形態に係る赤外線センサ１とほぼ同一の構造であり、異なるところは、赤外線遮蔽部材が、第１の実施形態ではケース体３のブリッジ部分３ｃによって構成されていたが、第３の実施形態ではケース体３の上方であってケース体３とキャップレンズ４との間に装入されたスリーブ状部材７（図８）によって構成されている点である。第１の実施形態の赤外線センサ１と同一部分については、同一の番号を付して説明を省略する。 (Third embodiment)
An infrared sensor according to a third embodiment of the present invention will be described with reference to FIGS. The infrared sensor 1 according to the third embodiment has substantially the same structure as the infrared sensor 1 according to the first embodiment, except that the infrared shielding member is a bridge of the case body 3 in the first embodiment. Although constituted by the portion 3c, in the third embodiment, it is constituted by a sleeve-like member 7 (FIG. 8) inserted above the case body 3 and between the case body 3 and the cap lens 4. It is a point. About the same part as the infrared sensor 1 of 1st Embodiment, the same number is attached | subjected and description is abbreviate | omitted.

スリーブ状部材７（赤外線遮蔽部材）は、図９（ａ）、（ｂ）に示されるように、外径ｄ１がキャップレンズ４の円筒形状下部４ｂの内径ｄ２と同一であり、高さｈ１が、キャップレンズ４の円筒形状下部４ｂの高さｈ２より僅かに大きい寸法に形成されており、スリーブ内を横方向に２分割する仕切り板部７ｂを有している。換言すると、組み立て時にスリーブ状部材７がキャップレンズ４内に挿入されたとき、スリーブ状部材７の外周とキャップレンズ４の間に隙間が生じず、スリーブ状部材７の下端とケース体３の上面との間にも隙間が生じないように構成されている。スリーブ状部材７の上端開口縁は、上方へ向かって先細りになるように斜めに裁断されており、裁断された斜面部７ａがキャップレンズ４のドーム状上部４ａの曲面に略沿うようになっている。   As shown in FIGS. 9A and 9B, the sleeve-like member 7 (infrared shielding member) has an outer diameter d1 that is the same as an inner diameter d2 of the cylindrical lower portion 4b of the cap lens 4 and a height h1. The cap lens 4 is formed in a dimension slightly larger than the height h2 of the cylindrical lower portion 4b, and has a partition plate portion 7b that divides the inside of the sleeve into two in the lateral direction. In other words, when the sleeve-like member 7 is inserted into the cap lens 4 at the time of assembly, no gap is formed between the outer periphery of the sleeve-like member 7 and the cap lens 4, and the lower end of the sleeve-like member 7 and the upper surface of the case body 3. It is comprised so that a clearance gap may not arise between. The upper end opening edge of the sleeve-like member 7 is cut obliquely so as to taper upward, and the cut inclined surface portion 7a is substantially along the curved surface of the dome-shaped upper portion 4a of the cap lens 4. Yes.

仕切り板部７ｂは、各レンズ部６ａ、６ｂによって集光された赤外線Ｒａ、Ｒｂが各焦電素子２ａ、２ｂへ入射する光路を遮らないように、平面視において各焦電素子２ａ、２ｂの中間の位置に設けられ（図１０）、仕切り板部７ｂの厚さｓ１は、各焦電素子２ａ、２ｂの離間距離ｓ２とほぼ同一に設定されている。また、スリーブ状部材７は、第１の実施形態におけるケース体３と同様に、例えばカーボンブラック等の顔料をアクリル樹脂やＡＢＳ樹脂に分散させたものの表面をサンドブラスト処理することによって形成されている。なお、ケース体３の上面には、第２の実施形態におけるケース体３と同様に１つの窓部３ｄが開けられている。   The partition plate portion 7b is configured so that the infrared rays Ra and Rb collected by the lens portions 6a and 6b do not block the optical path incident on the pyroelectric elements 2a and 2b. It is provided at an intermediate position (FIG. 10), and the thickness s1 of the partition plate portion 7b is set to be substantially the same as the separation distance s2 between the pyroelectric elements 2a and 2b. The sleeve-like member 7 is formed by sandblasting the surface of a material in which a pigment such as carbon black is dispersed in an acrylic resin or an ABS resin, like the case body 3 in the first embodiment. Note that a single window 3d is opened on the upper surface of the case body 3 in the same manner as the case body 3 in the second embodiment.

本実施形態の赤外線センサ１による検知動作も、第１の実施形態の赤外線センサ１と同様である。具体的には、検知エリアＡ、Ｂからキャップレンズ４内に進入した赤外線のうち進行方向が適正な焦電素子２ａ、２ｂの方向へ進行しない一部の赤外線Ｒｒは、スリーブ状部材７（赤外線遮蔽部材）の仕切り板部７ｂによって反射することなく吸収され、焦電素子２ａ、２ｂへは到達しない。従って、本実施形態の赤外線センサ１においても、高い精度で検知エリアＡ、Ｂ別に対象物の存在を検知することができる。また、スリーブ状部材７（赤外線遮蔽部材）は、フィルムや塗料によって形成される場合に比べて機械的強度が高い。   The detection operation by the infrared sensor 1 of the present embodiment is the same as that of the infrared sensor 1 of the first embodiment. Specifically, some of the infrared rays Rr that do not travel in the direction of the pyroelectric elements 2a and 2b whose traveling direction is appropriate among the infrared rays that have entered the cap lens 4 from the detection areas A and B are the sleeve-like member 7 (infrared rays). It is absorbed without being reflected by the partition plate portion 7b of the shielding member, and does not reach the pyroelectric elements 2a and 2b. Therefore, also in the infrared sensor 1 of the present embodiment, it is possible to detect the presence of an object for each of the detection areas A and B with high accuracy. Further, the sleeve-like member 7 (infrared shielding member) has a higher mechanical strength than that formed by a film or a paint.

以上のように、赤外線遮蔽部材は、第１の実施形態では、ケース体３自体のブリッジ部分３ｃによって構成され、第２の実施形態では、ケース体３の窓部３ｄに固定された板状部材２１によって構成され、第３の実施形態では、ケース体３の上面とキャップレンズ４との間に挿入されたスリーブ状部材７によって構成されるが、いずれの実施形態においても、赤外線遮蔽部材は、キャップレンズ４の内部に進入した赤外線のうち適正ではない方向に向かう一部の赤外線を吸収して、赤外線検出部（焦電素子２ａ、２ｂ）へ到達することを防止するので、赤外線検出部からの検知出力に基づいて高い精度で検知エリアＡ、Ｂ別に対象物の存在を検知することができる。   As described above, the infrared shielding member is constituted by the bridge portion 3c of the case body 3 itself in the first embodiment, and is a plate-like member fixed to the window portion 3d of the case body 3 in the second embodiment. In the third embodiment, it is constituted by a sleeve-like member 7 inserted between the upper surface of the case body 3 and the cap lens 4, but in any embodiment, the infrared shielding member is A part of the infrared rays entering the cap lens 4 in an inappropriate direction is absorbed and prevented from reaching the infrared detectors (pyroelectric elements 2a, 2b). It is possible to detect the presence of an object for each of the detection areas A and B with high accuracy based on the detection output.

本発明の第１の実施形態に係る赤外線センサを示す側断面図。1 is a side sectional view showing an infrared sensor according to a first embodiment of the present invention. （ａ）は同赤外線センサのキャップレンズの側断面図、（ｂ）は同赤外線センサの赤外線検出部を収納するケース体の側断面図。(A) is a sectional side view of the cap lens of the infrared sensor, and (b) is a sectional side view of a case body that houses the infrared detection unit of the infrared sensor. 同赤外線センサにおけるケース体の平面図。The top view of the case body in the infrared sensor. 同赤外線センサにおける赤外線検出部の配置を示す平面図。The top view which shows arrangement | positioning of the infrared detection part in the infrared sensor. 同赤外線センサにおける赤外線検出部の回路を示す図。The figure which shows the circuit of the infrared rays detection part in the infrared sensor. 本発明の第２の実施形態に係る赤外線センサを示す側断面図。The sectional side view which shows the infrared sensor which concerns on the 2nd Embodiment of this invention. 同赤外線センサにおけるケース体の平面図。The top view of the case body in the infrared sensor. 本発明の第３の実施形態に係る赤外線センサを示す側断面図。The sectional side view which shows the infrared sensor which concerns on the 3rd Embodiment of this invention. （ａ）は同赤外線センサのキャップレンズの側断面図、（ｂ）は同赤外線センサのスリーブ状部材の側面図、（ｃ）は同赤外線センサの赤外線検出部を収納するケース体の側断面図。(A) is a side sectional view of the cap lens of the infrared sensor, (b) is a side view of a sleeve-like member of the infrared sensor, and (c) is a side sectional view of a case body that houses the infrared detection unit of the infrared sensor. . 同赤外線センサにおけるケース体の平面図。The top view of the case body in the infrared sensor. 従来の赤外線センサによって人間と犬等の小動物とを区別して検知する原理を示す説明図。Explanatory drawing which shows the principle which distinguishes and detects humans and small animals, such as a dog, with the conventional infrared sensor.

符号の説明Explanation of symbols

１ 赤外線センサ
２ａ、２ｂ 焦電素子（赤外線検出部）
３ ケース体
３ｃ ブリッジ部（赤外線遮蔽部材）
６ａ、６ｂ レンズ部（集光レンズ）
７ スリーブ状部材（赤外線遮蔽部材）
２１ 板状部材（赤外線遮蔽部材）
Ａ、Ｂ 検知エリア 1 Infrared sensor 2a, 2b Pyroelectric element (infrared detector)
3 Case body 3c Bridge part (infrared shielding member)
6a, 6b Lens part (Condenser lens)
7 Sleeve-shaped member (infrared shielding member)
21 Plate member (infrared shielding member)
A, B detection area

Claims (1)

検知エリアの異なる複数の赤外線検出部を持つ多出力型の赤外線センサにおいて、
前記赤外線検出部に光を集光する集光レンズと、
前記赤外線検出部を覆い、かつ該赤外線検出部と集光レンズとの位置関係を規定するケース体と、を備え、
前記ケース体は、前記集光レンズと赤外線検出部との間に位置して個々の赤外線検出部同士を区切る赤外線遮蔽部材を持つことを特徴とする赤外線センサ。 In a multi-output type infrared sensor having a plurality of infrared detectors with different detection areas,
A condensing lens for condensing light on the infrared detector;
A case body that covers the infrared detection unit and defines a positional relationship between the infrared detection unit and the condenser lens;
The infrared sensor according to claim 1, wherein the case body includes an infrared shielding member that is positioned between the condenser lens and the infrared detection unit and separates the individual infrared detection units.
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