JP2818184B2 - Infrared passive type direction sensor - Google Patents
Infrared passive type direction sensorInfo
- Publication number
- JP2818184B2 JP2818184B2 JP1044442A JP4444289A JP2818184B2 JP 2818184 B2 JP2818184 B2 JP 2818184B2 JP 1044442 A JP1044442 A JP 1044442A JP 4444289 A JP4444289 A JP 4444289A JP 2818184 B2 JP2818184 B2 JP 2818184B2
- Authority
- JP
- Japan
- Prior art keywords
- pyroelectric
- elements
- pyroelectric elements
- pair
- 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 - Lifetime
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- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Radiation Pyrometers (AREA)
- Geophysics And Detection Of Objects (AREA)
Description
本発明は、一対の焦電素子を用いて熱線を発生する物
体の移動方向を検知する赤外線受動型方向判定センサに
関するものである。The present invention relates to an infrared passive direction determination sensor that detects a moving direction of an object that generates a heat ray using a pair of pyroelectric elements.
従来より一対の焦電素子を１つのパッケージ内に納装
したデュアル型と称する焦電センサが提供されている。
このような焦電センサでは、人体のように赤外線を発生
する物体が両焦電素子の配列方向に移動すると、各焦電
素子への赤外線の入射時刻に差が生じるから、物体の移
動方向の検出が可能になる。 たとえば、第５図に示すように、焦電センサ１の前方
にレンズ２を配設し、図中矢印方向に移動する物体から
の赤外線を検知する場合を考える。この場合、一方の焦
電素子3aには物体が検知領域Ａを通過するときに赤外線
が入射し、他方の焦電素子3bには物体が検知領域Ｂを通
過するときに赤外線が入射するから、両焦電素子3a,3b
への赤外線の入射時間に差が生じるのである。Conventionally, a pyroelectric sensor called a dual type in which a pair of pyroelectric elements are housed in one package has been provided.
In such a pyroelectric sensor, when an object that generates infrared rays, such as a human body, moves in the direction in which both pyroelectric elements are arranged, a difference occurs in the time at which the infrared rays are incident on each pyroelectric element. Detection becomes possible. For example, as shown in FIG. 5, a case is considered in which a lens 2 is provided in front of a pyroelectric sensor 1 to detect infrared rays from an object moving in the direction of the arrow in the figure. In this case, infrared rays are incident on one pyroelectric element 3a when the object passes through the detection area A, and infrared rays are incident on the other pyroelectric element 3b when the object passes through the detection area B. Both pyroelectric elements 3a, 3b
There is a difference in the time of incidence of infrared light to the camera.
ところで、焦電センサ１における焦電素子3a,3b間の
距離は小さいから、上記構成では各焦電素子3a,3bに対
応する検知領域A,B間の距離も小さくなる。その結果、
物体の移動速度が速い場合には、両焦電素子3a,3bで物
体を検出する時間の差が小さくなり、出力信号も小さく
なる結果、誤報や失報が発生しやすくなるという問題が
ある。 一方、第６図に示すように、焦電センサ１の前方に焦
電素子3a,3bの配列方向に離間した一対のレンズ2a,2bを
設ける構成も考えられている。この構成の場合、物体の
移動に伴って焦電センサ１の各焦電素子3a,3bには、そ
れぞれ２回ずつ赤外線が入射するようになり、物体の移
動を確実に検出できるようになる。しかしながら、両焦
電素子3a,3bへの赤外線の入射時刻の差は第５図の構成
と同じであるから、物体の移動方向については性能は改
善されないものである。 本発明は上記問題点の解決を目的とするものであり、
各焦電素子への赤外線の入射時刻の差を大きくすること
により、物体の移動方向を誤報や失報を生じることなく
検出するようにした赤外線受動型方向判定センサを提供
しようとするものである。By the way, since the distance between the pyroelectric elements 3a and 3b in the pyroelectric sensor 1 is small, the distance between the detection areas A and B corresponding to the pyroelectric elements 3a and 3b is also small in the above configuration. as a result,
When the moving speed of the object is high, the difference between the time for detecting the object by the two pyroelectric elements 3a and 3b becomes small, and the output signal also becomes small. On the other hand, as shown in FIG. 6, a configuration in which a pair of lenses 2a and 2b separated in the arrangement direction of the pyroelectric elements 3a and 3b are provided in front of the pyroelectric sensor 1 is also considered. In the case of this configuration, the infrared rays enter the pyroelectric elements 3a and 3b of the pyroelectric sensor 1 twice each with the movement of the object, so that the movement of the object can be detected reliably. However, since the difference between the incident times of the infrared rays on the pyroelectric elements 3a and 3b is the same as in the configuration of FIG. 5, the performance is not improved in the moving direction of the object. The present invention is aimed at solving the above problems,
It is an object of the present invention to provide an infrared passive direction determination sensor that detects a moving direction of an object without causing a false report or a false report by increasing a difference between incident times of infrared rays on each pyroelectric element. .
本発明では、上記目的を達成するために、逆直列に接
続された一対の焦電素子と、各焦電素子にそれぞれ対応
する一対のスリットを備えたスリット板と、両焦電素子
の間に両焦電素子の配列面に直交して配設され各スリッ
トを通る赤外線の対応する焦電素子以外への入射を禁止
する遮光板とを設けているのである。In the present invention, in order to achieve the above object, a pair of pyroelectric elements connected in anti-series, a slit plate having a pair of slits respectively corresponding to each pyroelectric element, between the two pyroelectric elements There is provided a light-shielding plate that is disposed orthogonal to the arrangement surface of the pyroelectric elements and that prohibits the infrared rays passing through the slits from entering other than the corresponding pyroelectric element.
上記構成によれば、各焦電素子の間に遮光板を設ける
ことにより、両焦電素子間の距離にかかわらず各焦電素
子への赤外線の入射時刻の差を大きくとることができる
から、移動速度が速い物体であっても両焦電素子の出力
レベルを大きくとることができ、移動物体の存在と移動
方向とを確実に検知することができるようになる。According to the above configuration, by providing the light shielding plate between the respective pyroelectric elements, it is possible to increase the difference between the incident times of the infrared rays to the respective pyroelectric elements regardless of the distance between the two pyroelectric elements. Even if the moving speed of the object is high, the output levels of the two pyroelectric elements can be increased, and the presence and the moving direction of the moving object can be reliably detected.
本発明の実施例を説明する前に本発明の基本となる基
本例について第１図を参照して説明する。第１図に示す
ように、一対の焦電素子3a,3bが１つのパッケージ４に
納装されて焦電センサ１を構成している。両焦電素子3
a,3bは逆直列に接続されており、両焦電素子3a,3bの配
列方向において、一方の焦電素子3aから他方の焦電素子
3bに向かって物体が移動するときには、第４図（ａ）に
示すように負側に大きな出力が得られ、物体の移動する
向きが逆であると、第４図（ｂ）に示すように正側に大
きな出力が得られるようになっている。したがって、第
３図に示すように、焦電センサ１の出力をコンパレータ
５に設定された正負の閾値T+,T-と比較すれば、物体の
移動方向を判別することができるのである。 焦電センサ１の前方には、第１図に示すように、両焦
電素子3a,3bの配列方向に離間して配設された一対のレ
ンズ2a,2bが設けられる。両レンズ2a,2b間の距離は可変
となるように配設されている。また、両焦電素子3a,3b
の間には、両焦電素子3a,3bの配列面に対して直交する
ように遮光板６が配設される。この遮光板６は、両レン
ズ2a,2bを通る赤外線を、それぞれ各焦電素子3a,3bに独
立して入射させるように設けられている。つまり、各レ
ンズ2a,2bを通過した赤外線は、それぞれ対応する焦電
阻止3a,3bにのみ入射し、他方には入射しないのであ
る。したがって、レンズ2a,2b間の距離に応じて各焦電
素子3a,3bにそれぞれ対応する検知領域A,Bの距離を調節
することができるのであって、両検知領域A,B間の距離
を従来よりも大きく設定できるようになる。すなわち、
各焦電素子3a,3bに赤外線が入射するタイミングの時間
差を従来よりも大きくとることができるのであって、焦
電センサ１の出力信号レベルが大きくなるから、誤報や
失報の発生が少なくなるのである。各検知領域A,Bにお
ける領域幅Ｗは、検知対象となる物体の幅とほぼ等しく
なるように設定される。また、両レンズ2a,2b間の距離
は、検知対象となる物体の速度に応じて設定される。通
常は、両検知領域A,B間の距離は領域幅Ｗの数倍に設定
される。 以上が本発明の基本例である。一方、第２図には本発
明の実施例を示しており、レンズ2a,2bに代えて一対の
スリット7a,7bを形成したスリット板８を用いている。
一般にスリット7a,7bを形成したスリット板８は、レン
ズ2a,2bよりも安価であるから、本実施例では基本例よ
りも低価格化することができる。また、スリット7a,7b
の距離を調節すれば、両検知領域A,Bの距離を調節で
き、さらに、スリット7a,7bの幅を調節すれば、検知領
域A,Bの領域幅Ｗも調節することができるのである。動
作は基本例と同様であるから、説明を省略する。Before describing an embodiment of the present invention, a basic example which is a basis of the present invention will be described with reference to FIG. As shown in FIG. 1, a pair of pyroelectric elements 3a and 3b are housed in one package 4 to constitute a pyroelectric sensor 1. Double pyroelectric element 3
a, 3b are connected in anti-series, and in the arrangement direction of both pyroelectric elements 3a, 3b, one pyroelectric element 3a is
When the object moves toward 3b, a large output is obtained on the negative side as shown in FIG. 4 (a), and when the object moves in the opposite direction, as shown in FIG. 4 (b). A large output is obtained on the positive side. Therefore, as shown in FIG. 3, the direction of movement of the object can be determined by comparing the output of the pyroelectric sensor 1 with the positive and negative threshold values T + and T − set in the comparator 5. As shown in FIG. 1, a pair of lenses 2a and 2b are provided in front of the pyroelectric sensor 1 so as to be spaced apart from each other in the arrangement direction of the pyroelectric elements 3a and 3b. The distance between the two lenses 2a and 2b is arranged to be variable. In addition, both pyroelectric elements 3a, 3b
Between them, a light shielding plate 6 is disposed so as to be orthogonal to the arrangement surface of the pyroelectric elements 3a and 3b. The light shielding plate 6 is provided so that infrared rays passing through both lenses 2a and 2b are independently incident on the pyroelectric elements 3a and 3b, respectively. That is, the infrared light that has passed through each of the lenses 2a and 2b enters only the corresponding pyroelectric block 3a and 3b, and does not enter the other. Therefore, the distance between the detection areas A and B corresponding to the pyroelectric elements 3a and 3b can be adjusted according to the distance between the lenses 2a and 2b, and the distance between the two detection areas A and B can be adjusted. It can be set larger than before. That is,
The time difference between the timings at which infrared rays enter the pyroelectric elements 3a and 3b can be made larger than before, and the output signal level of the pyroelectric sensor 1 increases, thereby reducing the occurrence of false reports and false reports. It is. The area width W in each of the detection areas A and B is set so as to be substantially equal to the width of an object to be detected. The distance between the two lenses 2a and 2b is set according to the speed of the object to be detected. Normally, the distance between the two detection areas A and B is set to several times the area width W. The above is a basic example of the present invention. On the other hand, FIG. 2 shows an embodiment of the present invention, in which a slit plate 8 having a pair of slits 7a and 7b is used instead of the lenses 2a and 2b.
Generally, the slit plate 8 formed with the slits 7a and 7b is cheaper than the lenses 2a and 2b, and therefore, in this embodiment, the price can be lower than in the basic example. Also, slits 7a, 7b
By adjusting the distance, the distance between the two detection areas A and B can be adjusted, and by adjusting the width of the slits 7a and 7b, the area width W of the detection areas A and B can also be adjusted. The operation is the same as in the basic example, and the description is omitted.
本発明は上述のように、逆直列に接続された一対の焦
電素子と、各焦電素子にそれぞれ対応する一対のスリッ
トを備えたスリット板と、両焦電素子の間に両焦電素子
の配列面に直交して配設され各スリットを通る赤外線の
対応する焦電素子以外への入射を禁止する遮光板とを設
けているものであり、各焦電素子の間に遮光板を設ける
ことにより、両焦電素子に赤外線が入射する時間の差を
大きくとることができるから、移動速度が速い物体であ
っても両焦電素子の出力レベルを大きくとることがで
き、移動物体の存在と移動方向とを確実に検知すること
ができるという利点を有するものである。 しかも、スリットの代わりに一対のレンズを設ける場
合に比較して、低価格化できるのである。As described above, the present invention provides a pair of pyroelectric elements connected in anti-series, a slit plate having a pair of slits corresponding to each of the pyroelectric elements, and a bipyroelectric element between the pyroelectric elements. And a light-shielding plate that is arranged orthogonal to the array plane and prohibits the incidence of infrared rays passing through each slit to other than the corresponding pyroelectric element, and a light-shielding plate is provided between each pyroelectric element. This makes it possible to increase the difference between the times at which infrared rays are incident on both pyroelectric elements, so that the output level of both pyroelectric elements can be increased even for an object with a high moving speed, and the presence of a moving object And the moving direction can be reliably detected. Moreover, the cost can be reduced as compared with the case where a pair of lenses is provided instead of the slit.
第１図は本発明の基本例を示す概略構成図、第２図は本
発明の実施例を示す概略構成図、第３図は本発明に係る
赤外線受動型方向判定センサの使用例を示すブロック
図、第４図は同上に用いる焦電センサの動作説明図、第
５図は従来例を示す概略構成図、第６図は他の従来例を
示す概略構成図である。 １……焦電センサ、2a,2b……レンズ、3a,3b……焦電素
子、６……遮光板、7a,7b……スリット、８……スリッ
ト板、A,B……検知領域。FIG. 1 is a schematic configuration diagram showing a basic example of the present invention, FIG. 2 is a schematic configuration diagram showing an embodiment of the present invention, and FIG. 3 is a block diagram showing an example of use of an infrared passive direction determination sensor according to the present invention. FIGS. 4 and 5 are explanatory diagrams of the operation of the pyroelectric sensor used in the first embodiment, FIG. 5 is a schematic configuration diagram showing a conventional example, and FIG. 1. Pyroelectric sensor, 2a, 2b... Lens, 3a, 3b... Pyroelectric element, 6... Light shielding plate, 7a, 7b... Slit, 8... Slit plate, A, B.
Claims (1)
焦電素子にそれぞれ対応する一対のスリットを備えたス
リット板と、両焦電素子の間に両焦電素子の配列面に直
交して配設され各スリットを通る赤外線の対応する焦電
素子以外への入射を禁止する遮光板とを備えて成ること
を特徴とする赤外線受動型方向判定センサ。1. A pair of pyroelectric elements connected in anti-series, a slit plate having a pair of slits respectively corresponding to the respective pyroelectric elements, and an arrangement surface of the two pyroelectric elements between the two pyroelectric elements. A light-shielding plate that is disposed orthogonally to and that prohibits the incidence of infrared light passing through each slit to elements other than the corresponding pyroelectric element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1044442A JP2818184B2 (en) | 1989-02-23 | 1989-02-23 | Infrared passive type direction sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1044442A JP2818184B2 (en) | 1989-02-23 | 1989-02-23 | Infrared passive type direction sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02223825A JPH02223825A (en) | 1990-09-06 |
| JP2818184B2 true JP2818184B2 (en) | 1998-10-30 |
Family
ID=12691603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1044442A Expired - Lifetime JP2818184B2 (en) | 1989-02-23 | 1989-02-23 | Infrared passive type direction sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2818184B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5793994B2 (en) * | 2011-06-27 | 2015-10-14 | 富士ゼロックス株式会社 | Image forming apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01116419A (en) * | 1987-10-29 | 1989-05-09 | Sumitomo Metal Mining Co Ltd | Infrared detector |
-
1989
- 1989-02-23 JP JP1044442A patent/JP2818184B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02223825A (en) | 1990-09-06 |
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