JPS60230082A - High frequency noise preventing circuit of infrared ray type detecting device - Google Patents
High frequency noise preventing circuit of infrared ray type detecting deviceInfo
- Publication number
- JPS60230082A JPS60230082A JP59087436A JP8743684A JPS60230082A JP S60230082 A JPS60230082 A JP S60230082A JP 59087436 A JP59087436 A JP 59087436A JP 8743684 A JP8743684 A JP 8743684A JP S60230082 A JPS60230082 A JP S60230082A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- frequency noise
- high frequency
- pass filter
- infrared
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Burglar Alarm Systems (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は移動する人体等の物体から放射される赤外線
エネルギー量と、建造物の床面等の背景から放射される
赤外線エネルギー量との差を検出して自動ドアの開閉を
制御する赤外線式移動物体検出装置や、投光器から発射
される赤外線を受光器で検知し、侵入者が赤外線を遮断
した時発報信号を出す赤外線式防犯瞥報装置等の赤外線
式検出装置に関し、高周波雑音、特に自動車電話やパー
ソナル無線、あるいは高周波治療器等が発する高周波雑
音による誤動作を防止するようにした前記装置に関する
ものである。Detailed Description of the Invention The present invention detects the difference between the amount of infrared energy emitted from a moving object such as a human body and the amount of infrared energy emitted from the background such as the floor of a building, and detects the difference between the amount of infrared energy emitted from an object such as a moving human body and the amount of infrared energy emitted from the background such as a building floor. Infrared detection devices such as infrared moving object detection devices that control opening and closing, and infrared crime prevention alarm devices that detect infrared light emitted from a floodlight with a receiver and issue an alarm signal when an intruder blocks the infrared light. The present invention relates to the above device which prevents malfunctions caused by high frequency noise, particularly high frequency noise emitted by car phones, personal radios, high frequency treatment devices, etc.
たとえば赤外線式移動物体検出装置は絶対零度（−２７
３℃）以上のあらゆる物体がその温度に応じた赤外線を
放射しており、常温状紡での人体や建造物が波長１０μ
ｍ付近の遠赤外線を放射していることを利用したもので
ある。予め建造物の床面等に検知エリ□アを設定してお
き、この検知エリアから放射される赤外線エネルギー量
を光学系によって常時監視し、検知エリア内への物体の
侵入に起因する赤外線エネルギー量の変化を検出して自
動ドアの開扉信号を出したシ、あるいは防犯Ｗ報装置の
発報信号を出すよう構成したものである。For example, an infrared moving object detection device uses absolute zero (-27
All objects with a temperature of 3℃ or higher emit infrared rays corresponding to their temperature, and the human body and buildings at room temperature emit infrared rays with a wavelength of 10μ.
It takes advantage of the fact that it emits far infrared rays around m. A detection area is set in advance on the floor of a building, etc., and the amount of infrared energy emitted from this detection area is constantly monitored by an optical system to detect the amount of infrared energy caused by an object entering the detection area. This device is configured to detect a change in the number of doors and issue an opening signal for an automatic door or an alarm signal for a crime prevention double alarm device.
ところで、これら赤外線式検出装置の電子回路に外部か
ら高周波電波か飛び込み、誤動作することがあった。た
とえば１４０〜１５０ＭＨｚ帯のアマチーア無線や警察
無線、４００ＭＨｚ帯のアマチーア無線やタクシ−その
他の業務用無線、８ｏｏ〜９００ＭＨｚ帯の自動車電話
やパーソナル無線、そして２ ＧＨｚ以上の高周波治療
器等が主な高周波の発生源である０これらの機器が発す
る高周波が赤外線式検出装置の電子回路中のトランジス
タ、ＩＣ，ダイオード、ＦＦｆＴ等の半導体に飛び込む
と、半導体の持つ非直線性によって検波されて偽信号と
なり、これか原因で誤動作の生じることがあった。By the way, there have been cases where high-frequency radio waves have entered the electronic circuits of these infrared detection devices from the outside, causing them to malfunction. For example, 140-150 MHz band Amachia radio and police radio, 400 MHz band Amachia radio, taxis and other commercial radios, 8oo-900 MHz band car telephones and personal radios, and 2 GHz or higher radio frequency treatment equipment are the main high-frequency devices. When the high frequency waves emitted by these devices jump into semiconductors such as transistors, ICs, diodes, and FFFTs in the electronic circuit of the infrared detection device, they are detected by the nonlinearity of the semiconductors and become false signals. This may be the cause of malfunctions.
従来この高周波雑音による誤動作の防止対策すなわち電
子回路内での高周波雑音の低減手段としては、シールド
ケースと貫通型コンデンサとを用いて電子回路を電気的
に追蔽する方法が採られることがあった。しかしなから
、シールドケースを配設スルだめのスペースか必要とな
るので機器ノ小型化が阻害されるだけでなく、コストが
上昇する割には雑音レベルの減少が１０〜２０ｄＢ程度
にすぎ１ ず、効果か少なかった。またバイパスコンデ
ンサによる方法では電圧モードの電波には有効であった
か、電流モードの電波には利き目がなく、高周波に対し
ては効果が少ないという欠点を有していた。さらには電
波ｇ＆散剤を塗布することも試みられているが、有効な
周波数帯域か狭いため、十分な効果を発揮するには到っ
ていない。Conventionally, as a measure to prevent malfunctions caused by high-frequency noise, that is, as a means to reduce high-frequency noise within electronic circuits, a method of electrically shielding the electronic circuit using a shield case and a feed-through capacitor was sometimes adopted. . However, the shield case requires a large amount of space, which not only impedes equipment miniaturization, but also reduces the noise level by only about 10 to 20 dB, despite the increased cost. , the effect was small. In addition, the method using a bypass capacitor was effective for voltage mode radio waves, but had the disadvantage that it had no advantage for current mode radio waves and was less effective for high frequencies. Furthermore, attempts have been made to apply radio wave g&powder, but the effective frequency band is narrow, so it has not been fully effective.
この発明は上記に鑑みなされたもので、前述のような高
周波雑音の低減手段として抵抗とコンデンサとから成る
ローパスフィルタを具備するとともに、前記コンデンサ
としては雑音となる高周波の周波数付近またはそれより
も高い自己共振周波数を有するコンデンサを採用したも
のである。さらに望ましくは電子回路のパターン、コン
デンサのリード線、インダクタンスおよび静電容量の合
成インピーダンスができる限シ小さくなるように、静電
容量が小さく、自己共振周波数が高く、がっリード線の
短いコンデンサを使用したローパスフィルタを、高周波
雑音の影響を受けやすい、信号レベルの低い電子回路の
近傍に配設し、ローパスフィルタ全体の自己共振周波数
を高めたものであ ！る。The present invention has been made in view of the above, and includes a low-pass filter consisting of a resistor and a capacitor as means for reducing high-frequency noise as described above, and the capacitor has a low-pass filter that is close to or higher than the frequency of the high-frequency noise that causes the noise. This uses a capacitor with a self-resonant frequency. Furthermore, it is desirable to use capacitors with low capacitance, high self-resonance frequency, and short lead wires so that the combined impedance of the electronic circuit pattern, capacitor lead wires, inductance, and capacitance is as small as possible. The low-pass filter used was placed near electronic circuits with low signal levels that are susceptible to high-frequency noise, increasing the self-resonant frequency of the entire low-pass filter! Ru.
以下、図示された一実施例にもとづいて本発明の詳細な
説明する。Hereinafter, the present invention will be described in detail based on an illustrated embodiment.
たとえば赤外線式移動物体検出装置においては、所定の
検知エリアから放射される遠赤外線は光学系によシ集光
され、焦電検出器、サーミスタ、ボロメータ、熱電堆等
の赤外線検出素子に入射する。For example, in an infrared moving object detection device, far infrared rays emitted from a predetermined detection area are focused by an optical system and incident on an infrared detection element such as a pyroelectric detector, a thermistor, a bolometer, or a thermoelectric pile.
赤外線検出素子は入射した赤外線エネルギーの変動量に
応じた信号を出力し、この出力信号を増幅して後続のス
イッチング回路に伝達するのがオペレーションアンプ等
の増幅回路である。なお、スイッチング回路は赤外線エ
ネルギー量の変動を監視し、所定の範囲を超える変動を
検知するとオンとなってＭＯ８ＦＦｉＴ等の電子スイッ
チを導通させ、自動ドア等の開閉を制御するコントロー
ラに開扉信号を出力させるものである。The infrared detection element outputs a signal corresponding to the amount of variation in the incident infrared energy, and an amplifier circuit such as an operational amplifier amplifies this output signal and transmits it to a subsequent switching circuit. The switching circuit monitors fluctuations in the amount of infrared energy, and when it detects fluctuations exceeding a predetermined range, it turns on and conducts an electronic switch such as MO8FFiT, sending a door opening signal to the controller that controls the opening and closing of automatic doors, etc. This is what outputs it.
以上のような構成の赤外線式移動物体検出装置において
、赤外線検出素子と増幅回路との間の信号レベルか比較
的低い回路に高周波雑音が飛び−込むと、増幅回路内の
オペレーションアンプ等のＩＣによって検波されて偽信
号となり、この偽信号でスイッチング回路がオンとなっ
て誤動作を引き起していた。In the infrared moving object detection device configured as described above, if high frequency noise enters the circuit between the infrared detection element and the amplifier circuit where the signal level is relatively low, it will be detected by the IC such as the operational amplifier in the amplifier circuit. The signal was detected and turned into a false signal, which turned on the switching circuit and caused it to malfunction.
第１図は本発明による高周波雑音防止回路の一実施例を
示す図で、オペレーションアンプ等ノＩＣ前段にローパ
スフィルタを配設した場合の例である。オペレージ１ン
アンプ１の入力端子に抵抗Ｒ夏とコンデンサＣＩ、およ
び抵抗Ｒ２とコンデンサＣ２とから成るローパスフィル
タをそれぞれ配設する。FIG. 1 is a diagram showing an embodiment of a high frequency noise prevention circuit according to the present invention, and is an example in which a low-pass filter is disposed before an IC such as an operational amplifier. A low-pass filter consisting of a resistor R2 and a capacitor CI, and a resistor R2 and a capacitor C2 are provided at the input terminal of the operating amplifier 1, respectively.
この時コンデンサＣＩおよびＣ２はそれぞれ影響を排除
しようとする高周波雑音の周波数付近またはそれよシも
高い自己共振周波数を有するものであることが必要で、
ローパスフィルタかコンデンサの自己共振周波数よシ高
い周波数ではインピーダンスか高くなＱ１０−バスフィ
ルタすなわちへイカノドフィルタ効果が悪くなることに
着目したものである。さらに実用的には、自己共振周波
数はコンデンサ単独の数値ではなく、ローパスフィルタ
のパターンの長さ、コンデンサのリード線の長さ、イン
ダクタンスおよび静電容量の合成インピーダンスどの関
係で、ローパスフィルタ全体の自己共振周波数として判
断される及きである。したがって、前述のような１．４
０ＭＨｚ〜２ ｏＨｚ の高周波雑音の場合、実用上は
コンデンサの静電容量は５〜１００ｐＦ、ＩＪ−ド線の
長さはできる限り短い方が望ましく約２Ｈ以下、抵抗は
１００Ω〜数にΩ、パターンの長さは関〜工酊程度の範
囲で適宜選択される。At this time, capacitors CI and C2 each need to have a self-resonant frequency near or higher than the frequency of the high-frequency noise whose influence is to be eliminated.
The focus is on the fact that at frequencies higher than the self-resonant frequency of the low-pass filter or capacitor, the impedance of the Q10-bass filter, that is, the Heikanod filter, deteriorates. Furthermore, in practical terms, the self-resonant frequency is not determined by the value of the capacitor alone, but by the relationship between the length of the low-pass filter pattern, the length of the capacitor lead wire, and the combined impedance of inductance and capacitance. This is determined to be the resonant frequency. Therefore, 1.4 as mentioned above
In the case of high frequency noise of 0MHz to 2 oHz, in practice the capacitance of the capacitor is 5 to 100pF, the length of the IJ-wire is preferably as short as possible, about 2H or less, the resistance is 100Ω to several Ω, the pattern is The length of is selected as appropriate within the range of about 100 to 100%.
この結果、自己共振周波数以下の高周波雑音はローパス
フィルタによってカットされるのでオペ・１
□レーションアンブ１に入ることはなく、シたがって高
周波雑音に起因する偽信号が完全に排除されるので、誤
動作か解消できる。As a result, high-frequency noise below the self-resonant frequency is cut by the low-pass filter and does not enter Operation 1 □Operation Ambient 1. Therefore, false signals caused by high-frequency noise are completely eliminated, resulting in malfunctions. or can be resolved.
また、・第２図は本発明によるローパスフィルタをＩＣ
オペレージコンアンプ２内に一体的に構成した場合の実
施例であり、抵抗Ｒ３およびコンデンサＣ１１、抵抗Ｒ
４およびコンデンサＣ４によってそれぞれローパスフィ
ルタが形成されている。このような構成によれば、高周
波雑音に対してアンテナの役目を果たすパターンの長さ
を短くすることができるので、ローパスフィルタの自己
共振周波数をより一層高くすることが可能である。また
ＩＣ基板上に一体的にローパスフィルタを設けるので、
高周波雑音の低減手段として機能するだけでなく、機器
の組立や調整の際に人体に蓄積された静電気にもとづく
静電破壊によりＩＣ基板が損傷を受けることを防止する
という副次的な効果もあわせ持つものである。Also, Figure 2 shows a low-pass filter according to the present invention in an IC.
This is an example in which the resistor R3, the capacitor C11, the resistor R
4 and capacitor C4 form a low-pass filter. According to such a configuration, the length of the pattern that serves as an antenna against high-frequency noise can be shortened, so it is possible to further increase the self-resonant frequency of the low-pass filter. Also, since a low-pass filter is provided integrally on the IC board,
Not only does it function as a means of reducing high-frequency noise, but it also has the secondary effect of preventing damage to the IC board due to electrostatic damage caused by static electricity accumulated in the human body during equipment assembly and adjustment. It is something you have.
さらに、第３図は本発明によるローパスフィルタを焦電
検出器内に組み込んだ場合の実施例である。ドレイン端
子りに接続された抵抗Ｒ５とコンデンサＣ５、およびソ
ース端子Ｓに接続された抵抗Ｒ６とコンデンサＣ６によ
つてそれぞれローパスフィルタが形成されている。この
ような構成においても、高周波雑音に対してアンテナと
なる配線の長さか短くなるのでローパスフィルタの共振
周波数を高くできる他、焦電検出器の外周かシールドケ
ース３によシシールドされているのでよシ一層大きな効
果が発揮される。なおコンデンサのみ焦電検出器内に組
み込み、抵抗を外部に配置しても、コン申
デンサおよび抵抗ともに外部に配置する以上の効果が得
られる。Furthermore, FIG. 3 shows an embodiment in which a low-pass filter according to the present invention is incorporated into a pyroelectric detector. A low-pass filter is formed by a resistor R5 and a capacitor C5 connected to the drain terminal, and a resistor R6 and a capacitor C6 connected to the source terminal S, respectively. Even with this configuration, the length of the wiring that serves as an antenna against high-frequency noise is shortened, so the resonant frequency of the low-pass filter can be increased, and since the outer periphery of the pyroelectric detector is shielded by the shield case 3, The effect is even greater. Note that even if only the capacitor is built into the pyroelectric detector and the resistor is placed outside, a greater effect than when both the capacitor and the resistor are placed outside can be obtained.
以上の実施例においては赤外線式移動物体検出装置につ
いて述べてきたが、本発明はこれに限られるものではな
く、前述の赤外線式防犯警報装置を始めとする赤外線式
検出装置一般に広く適用することが可能で、同様の効果
を発揮するのは言うまでもない。In the above embodiments, an infrared moving object detection device has been described, but the present invention is not limited to this, and can be widely applied to infrared detection devices in general, including the above-mentioned infrared security alarm device. It goes without saying that it is possible and will have the same effect.
以上詳述したとおり、本発明によれば抵抗とコンデンサ
という非常に安価な部品で、なおかつ非常に簡単な構造
により、従来の高周波雑音防止対策によっては不可能で
あった極めて広い周波数帯域の高周波雑音を低減するこ
とか可能となった。As detailed above, the present invention uses extremely inexpensive components such as resistors and capacitors, and has a very simple structure, so that it can eliminate high frequency noise in an extremely wide frequency band, which was impossible with conventional high frequency noise prevention measures. It became possible to reduce the
たとえば９００ＭＨｚ 、 ５ Ｗのパーソナル無線か
発する高周波雑音について赤外線式移動物体検出装置に
対する彩管を比較した実験結果によれば、高周波雑音に
対して無対策の場合、パーソナル無線と赤外線式移動物
体検出装置との間隔が１５ｍ程度になると誤動作か生じ
た。また前述のような従来の対策によっては３ｍ前後で
誤動作が生じていたか、本発明によるローパスフィルタ
を配設した場合には約３０ｃＷの至近距離であっても誤
動作することがなくなった。したかつて、赤外線式検出
装置の高周波雑音に起因する誤動作の発生を根本的に解
消し、この種機器の環境設置条件の制限を大幅に緩和す
るものであり、本発明の赤外線式検出装置の用途拡大に
対する貢献度は測り知れないものである。For example, according to the results of an experiment comparing a color tube to an infrared moving object detection device for high frequency noise emitted by a 900 MHz, 5 W personal radio, it was found that if no measures were taken against high frequency noise, the personal radio and the infrared moving object detection device A malfunction occurred when the distance between the two was about 15m. Further, depending on the conventional measures as described above, malfunctions occurred at around 3 meters, but when the low-pass filter according to the present invention is provided, malfunctions no longer occur even at close distances of about 30 cW. The purpose of this invention is to fundamentally eliminate the occurrence of malfunctions caused by high-frequency noise in infrared detection devices, and to significantly ease the restrictions on environmental installation conditions for this type of equipment. Its contribution to expansion is immeasurable.
第１図は本発明によるローパスフィルタをオペレーショ
ンアンプの前段に配設した場合の実施例図は焦電検出器
内に組み込んだ場合の実施例である。
ｌ・・・オペレーションアンプ
２・・・ＩＣオペレーションアンプFIG. 1 shows an embodiment in which a low-pass filter according to the present invention is disposed before an operational amplifier. FIG. 1 shows an embodiment in which the low-pass filter according to the present invention is installed in a pyroelectric detector. l...Operation amplifier 2...IC operation amplifier
Claims (1)
体の侵入を検出するようにした赤外線式検出装置におい
て、高周波雑音低減手段として抵抗とコンデンサから成
るローパスフィルタを具備するとともに、前記コンデン
サは高周波雑音の周波微付近またはそれより高い自己共
振周波数を有するものであることを特徴とする赤外線式
検出装置の高周波雑音防止回路。, an infrared detection device configured to detect the intrusion of an object into a detection area by detecting a change in the amount, which is equipped with a low-pass filter consisting of a resistor and a capacitor as a high-frequency noise reduction means, and the capacitor is A high-frequency noise prevention circuit for an infrared detection device, characterized in that the circuit has a self-resonance frequency near or higher than the frequency of high-frequency noise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59087436A JPS60230082A (en) | 1984-04-27 | 1984-04-27 | High frequency noise preventing circuit of infrared ray type detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59087436A JPS60230082A (en) | 1984-04-27 | 1984-04-27 | High frequency noise preventing circuit of infrared ray type detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60230082A true JPS60230082A (en) | 1985-11-15 |
Family
ID=13914814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59087436A Pending JPS60230082A (en) | 1984-04-27 | 1984-04-27 | High frequency noise preventing circuit of infrared ray type detecting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60230082A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62240672A (en) * | 1986-04-01 | 1987-10-21 | デグツサ・アクチエンゲゼルシヤフト | N,n'-substituted-bis-(2,4-diamino-s-triazine-6-yl)- tetrasulfide, manufacture and vulcanizable rubber mixture |
| JPS63190938U (en) * | 1987-05-29 | 1988-12-08 | ||
| JPH02133792U (en) * | 1989-04-07 | 1990-11-06 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5627785B2 (en) * | 1975-12-19 | 1981-06-26 |
-
1984
- 1984-04-27 JP JP59087436A patent/JPS60230082A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5627785B2 (en) * | 1975-12-19 | 1981-06-26 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62240672A (en) * | 1986-04-01 | 1987-10-21 | デグツサ・アクチエンゲゼルシヤフト | N,n'-substituted-bis-(2,4-diamino-s-triazine-6-yl)- tetrasulfide, manufacture and vulcanizable rubber mixture |
| JPS63190938U (en) * | 1987-05-29 | 1988-12-08 | ||
| JPH0530105Y2 (en) * | 1987-05-29 | 1993-08-02 | ||
| JPH02133792U (en) * | 1989-04-07 | 1990-11-06 |
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