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EP0647928A1 - Passive infrared movement detector - Google Patents

Passive infrared movement detector Download PDF

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Publication number
EP0647928A1
EP0647928A1 EP94113275A EP94113275A EP0647928A1 EP 0647928 A1 EP0647928 A1 EP 0647928A1 EP 94113275 A EP94113275 A EP 94113275A EP 94113275 A EP94113275 A EP 94113275A EP 0647928 A1 EP0647928 A1 EP 0647928A1
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EP
European Patent Office
Prior art keywords
infrared
fresnel lens
motion detector
sensitive
passive 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.)
Granted
Application number
EP94113275A
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German (de)
French (fr)
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EP0647928B1 (en
Inventor
Peter Dipl.-Ing. Wiffel
Hans-Heinrich Dipl.-Ing. Behrmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Insta Elektro GmbH and Co KG
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Insta Elektro GmbH and Co KG
Priority date (The priority date 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 date listed.)
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Publication of EP0647928A1 publication Critical patent/EP0647928A1/en
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
    • G08B13/193—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems using focusing means

Definitions

  • the invention relates to a passive infrared motion detector for at least 180 ° detection range according to the preamble of claim 1.
  • a motion detector of the generic type is known from European Patent Application No. 0 113 468 A2. It essentially consists of an infrared-sensitive sensor which is arranged on a carrier together with two mirror elements. The carrier is closed by a curved lens arrangement. In order to enable an optimal wide-angle detection of the area to be monitored, the incident rays are directed onto surfaces of the mirror elements, whereby an analog assignment of the beam direction of incidence and mirror surfaces is realized.
  • This method with a single sensor and two mirror surfaces, in conjunction with a lens array requires the mirror surfaces to be assigned to the associated lens section or individual lenses in the most precisely aligned manner. Due to the design, this results in a high design of the curved lens arrangement for the room monitoring function by means of a passive infrared-sensitive sensor.
  • the object of the invention is to design a passive infrared motion detector that has a design that is as flat as possible with a detection area of at least 180 ° in the horizontal direction.
  • Fig. 1 the structure of a passive infrared motion detector is shown schematically in side view.
  • 1 denotes an infrared sensor in the form of a two-element sensor and 2 denotes mirror elements assigned to a sensor surface 5.
  • the two-element sensor 1 and the mirror elements 2 are arranged on a printed circuit board 4 together with evaluation electronics (not shown).
  • This structure is completed by a Fresnel arrangement in the form of a curved film 3.
  • FIG. 1 there is an equally large, infrared-sensitive area 5 on opposite sides of the two-element sensor. These sensor areas 5 each have a reception characteristic of approximately 120 °. This can be used to capture the side areas 6. As expected, this results in a dead area in the front area 7.
  • a mirror arrangement 2 is used according to the invention. 2 shows a basic illustration of the thermal radiation 8 from the side area 6 and the front area 7 onto one of the two infrared-sensitive sensor areas 5 of a two-element sensor 1. From this it can be seen that the thermal radiation 8 is also received from the front area 7 and is deflected to the respective sensor surface 5 via a mirror surface 2.
  • the lens element 9 of a Fresnel lens arrangement 3 lying in the heat radiation direction in the front region 7 can move very close to the two-element sensor 1.
  • the lens elements A1 and A2 have approximately the same focal length.
  • the lens element A2 has a significantly shorter distance from the infrared-sensitive surface 5 as the lens element A1.
  • this arrangement is possible in that the addition of L1 and L2 results in approximately the length L3, which characterize the focal lengths of the lens elements A1 and A2.
  • the beam path L1 and L2 across the mirror surface 2 results in an apparent shortening of the focal length.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Radiation Pyrometers (AREA)

Abstract

A passive infrared movement detector for a detection range of at least 180 DEG comprises an infrared sensor (1) with mirror elements (2) and a Fresnel lens system in the form of a bent film (3) which forms, together with an electronic evaluation system, a structural unit on the printed circuit board (4). It is in this case essential for the invention that the infrared sensor is a two-element sensor (1) which has on mutually opposite sides in each case one infrared-sensitive surface (5) which covers the associated lateral region (6) directly and the front region (7) indirectly via a mirror (2) arranged on the two sides in front of the infrared-sensitive surfaces (5). <IMAGE>

Description

Die Erfindung betrifft einen passiven Infrarot-Bewegungsmelder für mindestens 180° Erfassungsbereich gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a passive infrared motion detector for at least 180 ° detection range according to the preamble of claim 1.

Aus der europäischen Offenlegungsschrift Nr. 0 113 468 A2 ist ein Bewegungsmelder der gattungsbildenden Art bekannt. Er besteht im wesentlichen aus einem infrarotempfindlichen Sensor, der zusammen mit zwei Spiegelelementen auf einem Träger angeordnet ist. Der Träger wird von einer gewölbten Linsenanordnung verschlossen. Um eine optimal weitwinklige Erfassung des zu überwachenden Raumbereiches zu ermöglichen, werden die einfallenden Strahlen auf Flächen der Spiegelelemente gerichtet, wodurch eine analoge Zuordnung von Strahlbündel-Einfallsrichtung und Spiegelflächen realisiert wird. Dieses Verfahren mit einem einzigen Sensor und zwei Spiegelflächen erfordert in Verbindung mit einem Linsenarray eine auf das genaueste ausgerichtete Zuordnung der Spiegelflächen mit dem zugehörigen Linsenabschnitt bzw. Einzellinsen. Konstruktionsbedingt ergibt sich daraus für die Raumüberwachungsfunktion mittels passiv infrarotempfindlichem Sensor eine hohe Bauform der gewölbten Linsenanordnung.A motion detector of the generic type is known from European Patent Application No. 0 113 468 A2. It essentially consists of an infrared-sensitive sensor which is arranged on a carrier together with two mirror elements. The carrier is closed by a curved lens arrangement. In order to enable an optimal wide-angle detection of the area to be monitored, the incident rays are directed onto surfaces of the mirror elements, whereby an analog assignment of the beam direction of incidence and mirror surfaces is realized. This method with a single sensor and two mirror surfaces, in conjunction with a lens array, requires the mirror surfaces to be assigned to the associated lens section or individual lenses in the most precisely aligned manner. Due to the design, this results in a high design of the curved lens arrangement for the room monitoring function by means of a passive infrared-sensitive sensor.

Aufgabe der Erfindung ist es, einen Passiv-Infrarot-Bewegungsmelder zu konzipieren, der bei mindestens 180° Erfassungsbereich in horizontaler Richtung über eine möglichst flache Bauform verfügt.The object of the invention is to design a passive infrared motion detector that has a design that is as flat as possible with a detection area of at least 180 ° in the horizontal direction.

Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst, wobei zweckmäßige Ausführungen in den Merkmalen der Unteransprüche angegeben sind.This object is achieved by the features of claim 1, expedient designs being specified in the features of the subclaims.

Anhand eines in den Zeichnungsfiguren schematisch dargestellten Ausführungsbeispiels ist die Erfindung näher erläutert. Es zeigt:

Fig. 1
einen infrarotempfindlichen Zweielementsensor, der auf einander gegenüberliegenden Seiten je eine infrarotempfindliche Fläche aufweist;
Fig. 2
eine prinzipielle Darstellung der Wärmestrahlengänge aus dem Seiten- und Frontbereich auf eine der beiden infrarotempfindlichen Flächen des Zweielementsensors unter Berücksichtigung annähernd gleicher Brennweiten der Linsenelemente einer Fresnel-Linsenanordnung;
Fig. 3
eine perspektivische Darstellung über die zwei gleichartig gekrümmten Spiegelflächen in unmittelbarer Nähe jeweils von einer infrarotempfindlichen Fläche eines Zweielementsensors, wobei jede gekrümmte Spiegelfläche zur Erfassung der Wärmestrahlen aus unterschiedlichen horizontalen Richtungen dient;
Fig. 4
eine perspektivische Darstellung der Spiegelfläche zur Verdeutlichung des Strahlenganges einer Wärmestrahlung aus unterschiedlichen vertikalen Richtungen.
The invention is explained in more detail on the basis of an exemplary embodiment shown schematically in the drawing figures. It shows:
Fig. 1
an infrared-sensitive two-element sensor, each having an infrared-sensitive area on opposite sides;
Fig. 2
a basic representation of the heat radiation paths from the side and front area on one of the two infrared-sensitive surfaces of the two-element sensor taking into account approximately the same focal lengths of the lens elements of a Fresnel lens arrangement;
Fig. 3
a perspective view of the two similarly curved mirror surfaces in the immediate vicinity of an infrared-sensitive surface of a two-element sensor, each curved mirror surface serving to detect the heat rays from different horizontal directions;
Fig. 4
a perspective view of the mirror surface to illustrate the beam path of heat radiation from different vertical directions.

In Fig. 1 ist in Seitenansicht schematisch der Aufbau eines Passiv-Infrarot-Bewegungsmelders dargestellt. Dabei ist mit 1 ein Infrarotsensor in Form eines Zweielementsensors und mit 2 sind jeweils einer Sensorfläche 5 zugeordnete Spiegelelemente bezeichnet. Der Zweielementsensor 1 und die Spiegelelemente 2 sind zusammen mit einer nicht näher gekennzeichneten Auswerteelektronik auf einer Leiterplatte 4 angeordnet. Dieser Aufbau wird durch eine Fresnel-Anordnung in Form einer gekrümmten Folie 3 abgeschlossen.In Fig. 1, the structure of a passive infrared motion detector is shown schematically in side view. 1 denotes an infrared sensor in the form of a two-element sensor and 2 denotes mirror elements assigned to a sensor surface 5. The two-element sensor 1 and the mirror elements 2 are arranged on a printed circuit board 4 together with evaluation electronics (not shown). This structure is completed by a Fresnel arrangement in the form of a curved film 3.

Wie noch aus Fig. 1 ersichtlich, befindet sich auf einander gegenüberliegenden Seiten des Zweielementsensors je eine gleichgroße, infrarotempfindliche Fläche 5. Diese Sensorflächen 5 besitzen jeweils eine Empfangscharakteristik von ca. 120°. Diese kann genutzt werden, um die Seitenbereiche 6 zu erfassen. Erwartungsgemäß ergibt sich hiermit ein Totbereich im Frontbereich 7. Um auch im Frontbereich 7 wie im Seitenbereich 6 ein vergleichbares Erfassungsfeld zu erhalten, wird erfindungsgemäß eine Spiegelanordnung 2 verwendet. In Fig. 2 ist eine prinzipielle Darstellung der Wärmestrahlung 8 aus dem Seitenbereich 6 und dem Frontbereich 7 auf eine der beiden infrarotempfindlichen Sensorflächen 5 eines Zweielementsensors 1 dargestellt. Hieraus ist ersichtlich, daß auch die Wärmestrahlung 8 aus dem Frontbereich 7 empfangen wird und über eine Spiegelfläche 2 zur jeweiligen Sensorfläche 5 umgelenkt wird. Durch das Umlenken der Wärmestrahlen 8 auf eine Sensorfläche 5 kann das jeweils in Wärmestrahlrichtung liegende Linsenelement 9 einer Fresnel-Linsenanordnung 3 im Frontbereich 7 sehr nahe an den Zweielementsensor 1 heranrücken. Wie weiter aus Fig. 2 ersichtlich ist, besitzen die Linsenelemente A₁ und A₂ annähernd die gleiche Brennweite. Das Linsenelement A₂ hat einen deutlich kürzeren Abstand zur infrarotempfindlichen Fläche 5 als das Linsenelement A₁. Wie aus den Strahlengängen L1, L2, L3 ersichtlich, ist diese Anordnung dadurch möglich, daß die Addition von L1 und L2 annähernd die Länge L3 ergibt, welche die Brennweiten der Linsenelemente A₁ und A₂ kennzeichnen. Durch den Strahlengang L1 und L2 über die Spiegelfläche 2 ergibt sich eine scheinbare Verkürzung der Brennweite. Wie noch aus der Fig. 2 ersichtlich ist, ist im Seitenbereich 6 durch den geradlinigen Einfall der Wärmestrahlung 8 eine scheinbare Verkürzung der Brennweite nicht gegeben, weshalb auch der Abstand zwischen dem Sensor 1 und dem Linsenelement entsprechend größer ist. Hierdurch wird erreicht, daß die Brennweiten aller Linsenelemente der Fresnel-Linsenanordnung annähernd gleich gehalten werden können, was bei der Herstellung solcher Linsenanordnungen vorteilhaft ist. Hierdurch ergibt sich auch eine vorteilhafte Formgebung der gesamten Linsenanordnung, so daß die erfindungsgemäß angestrebte flache Bauform für einen Passiv-Infrarot-Bewegungsmelder realisierbar ist. Fig. 3 zeigt in perspektivischer Sicht die Kontur des gekrümmten Spiegels 2, durch die eine 180°-Erfassung des zu überwachenden Horizontalbereiches H gegeben ist. In Fig. 4 ist die Spiegelanordnung ebenfalls perspektivisch dargestellt. Durch die Großflächigkeit der Spiegel 2 ist sichergestellt, daß die Zuführung der Wärmestrahlung 8 nicht nur aus verschiedenen horizontalen Richtungen, sondern auch aus unterschiedlich vertikalen Richtungen V auf die infrarotempfindliche Sensorfläche 5 gegeben ist. Mit 9 ist beispielhaft eine der Linsen dargestellt, aus der die Linsenanordnung 3 zusammengesetzt ist.As can still be seen from FIG. 1, there is an equally large, infrared-sensitive area 5 on opposite sides of the two-element sensor. These sensor areas 5 each have a reception characteristic of approximately 120 °. This can be used to capture the side areas 6. As expected, this results in a dead area in the front area 7. In order to obtain a comparable detection field in the front area 7 as well as in the side area 6, a mirror arrangement 2 is used according to the invention. 2 shows a basic illustration of the thermal radiation 8 from the side area 6 and the front area 7 onto one of the two infrared-sensitive sensor areas 5 of a two-element sensor 1. From this it can be seen that the thermal radiation 8 is also received from the front area 7 and is deflected to the respective sensor surface 5 via a mirror surface 2. By deflecting the heat rays 8 onto a sensor surface 5, the lens element 9 of a Fresnel lens arrangement 3 lying in the heat radiation direction in the front region 7 can move very close to the two-element sensor 1. As can further be seen from Fig. 2, the lens elements A₁ and A₂ have approximately the same focal length. The lens element A₂ has a significantly shorter distance from the infrared-sensitive surface 5 as the lens element A₁. As can be seen from the beam paths L1, L2, L3, this arrangement is possible in that the addition of L1 and L2 results in approximately the length L3, which characterize the focal lengths of the lens elements A₁ and A₂. The beam path L1 and L2 across the mirror surface 2 results in an apparent shortening of the focal length. As can still be seen from FIG. 2, there is no apparent reduction in the focal length in the side region 6 due to the linear incidence of the thermal radiation 8, which is why the distance between the sensor 1 and the lens element is correspondingly larger. This ensures that the focal lengths of all lens elements of the Fresnel lens arrangement can be kept approximately the same, which is advantageous in the production of such lens arrangements. This also results in an advantageous shape of the entire lens arrangement, so that the flat design desired according to the invention can be realized for a passive infrared motion detector. 3 shows a perspective view of the contour of the curved mirror 2, through which a 180 ° detection of the horizontal region H to be monitored is provided. 4, the mirror arrangement is also shown in perspective. The large area of the mirrors 2 ensures that the heat radiation 8 is supplied to the infrared-sensitive sensor surface 5 not only from different horizontal directions, but also from different vertical directions V. 9 shows an example of one of the lenses from which the lens arrangement 3 is composed.

Claims (6)

Passiv-Infrarot-Bewegungsmelder für mindestens 180° Erfassungsbereich in horizontaler Richtung, bestehend aus einem Infrarot-Sensor (1) und Spiegelelementen (2), einem Fresnel-Linsensystem in Form einer gekrümmten Folie (3), die zusammen mit einer Auswerteelektronik auf einer Leiterplatte (4) eine bauliche Einheit bildet, dadurch gekennzeichnet, daß der Sensor ein Zweielementsensor (1) ist, der auf einander gegenüberliegenden Seiten jeweils eine infrarotempfindliche Fläche (5) aufweist, die unmittelbar Wärmestrahlen (8) aus den zugehörigen Seitenbereichen (6) und mittelbar solche aus über einen beidseitig vor den infrarotempfindlichen Flächen (5) angeordneten Spiegel (2) des Frontbereiches (7) erfaßt.Passive infrared motion detector for at least 180 ° detection range in the horizontal direction, consisting of an infrared sensor (1) and mirror elements (2), a Fresnel lens system in the form of a curved film (3), which together with evaluation electronics on a circuit board (4) forms a structural unit, characterized in that the sensor is a two-element sensor (1) which has an infrared-sensitive surface (5) on opposite sides, which directly emits heat rays (8) from the associated side areas (6) and indirectly those from a mirror (2) of the front area (7) arranged on both sides in front of the infrared-sensitive surfaces (5). Passiv-Infrarot-Bewegungsmelder nach Anspruch 1, dadurch gekennzeichnet, daß im Seitenbereich (6) einer infrarotempfindlichen Sensorfläche (5) eine durch einen entsprechenden Abschnitt A 1 der gekrümmten Fresnel-Linse (3) fokussierte Wärmestrahlung (8) geradlinig auf die jeweils korrespondierende, infrarotempfindliche Sensorfläche (5) fällt, und daß eine fokussierte Wärmestrahlung (8) aus einem Abschnitt A 2 im Frontbereich (7) der Fresnel-Linse (3) über einen mit ihr korrespondierenden Spiegel (2) umgelenkt wird, bevor sie ebenfalls auf die jeweilige infrarotempfindliche Sensorfläche (5) fällt (Fig. 2).Passive infrared motion detector according to claim 1, characterized in that in the side region (6) of an infrared-sensitive sensor surface (5) a heat radiation (8) focused by a corresponding section A 1 of the curved Fresnel lens (3) is rectilinear to the respectively corresponding Infrared-sensitive sensor surface (5) falls, and that a focused heat radiation (8) from a section A 2 in the front area (7) of the Fresnel lens (3) is deflected via a mirror (2) corresponding to it before it is also directed to the respective one infrared-sensitive sensor surface (5) falls (Fig. 2). Passiv-Infrarot-Bewegungsmelder nach Anspruch 1 und 2, dadurch gekennzeichnet, daß durch die Umlenkung der Wärmestrahlung (8) aus dem Frontbereich (7) über die Spiegel (2) der Abstand der Fresnel-Linse (3) zur Leiterplatte (4) gering gehalten wird.Passive infrared motion detector according to claim 1 and 2, characterized in that the distance of the Fresnel lens (3) from the circuit board (4) is small due to the deflection of the heat radiation (8) from the front area (7) via the mirrors (2) is held. Passiv-Infrarot-Bewegungsmelder nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß trotz verringertem Abstand zwischen Fresnel-Linse (3) und Leiterplatte (4) im Frontbereich (7) infolge der Umlenkung der Wärmestrahlung die Linsenelemente der Fresnel-Linse (3) im Frontbereich (7) annähernd die gleiche Brennweite aufweisen wie die Linsenelemente der Fresnel-Linse im Seitenbereich (6).Passive infrared motion detector according to claims 1 to 3, characterized in that despite the reduced distance between the Fresnel lens (3) and the printed circuit board (4) in the front region (7) due to the deflection of the heat radiation, the lens elements of the Fresnel lens (3) in Front area (7) has approximately the same focal length as the lens elements of the Fresnel lens in the side area (6). Passiv-Infrarot-Bewegungsmelder nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die beidseitig der infrarotempfindlichen Sensorflächen (5) angeordneten Spiegel (2) gleichartige Krümmungen aufweisen, wodurch die aus unterschiedlichen horizontalen Richtungen (H) durch die Fresnel-Linse (3) einfallenden Wärmestrahlen (8) stets auf die jeweilige infrarotempfindliche Sensorfläche (5) gelangen (Fig. 3).Passive infrared motion detector according to one of claims 1 to 4, characterized in that the mirrors (2) arranged on both sides of the infrared-sensitive sensor surfaces (5) have identical curvatures, as a result of which the Fresnel lens (3.) From different horizontal directions (H) ) incoming heat rays (8) always reach the respective infrared-sensitive sensor surface (5) (Fig. 3). Passiv-Infrarot-Bewegungsmelder nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die beiden Spiegel (2) großflächig ausgebildet sind, damit auch Wärmestrahlen (8) aus unterschiedlich vertikalen Richtungen stets auf die jeweilige infrarotempfindliche Sensorfläche (5) gelangen (Fig. 4).Passive infrared motion detector according to one of claims 1 to 5, characterized in that the two mirrors (2) are formed over a large area so that heat rays (8) from different vertical directions always reach the respective infrared-sensitive sensor surface (5) (Fig. 4).
EP94113275A 1993-10-02 1994-08-25 Passive infrared movement detector Expired - Lifetime EP0647928B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4333707 1993-10-02
DE4333707A DE4333707C2 (en) 1993-10-02 1993-10-02 Passive infrared motion detector

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EP0647928A1 true EP0647928A1 (en) 1995-04-12
EP0647928B1 EP0647928B1 (en) 1999-04-07

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EP (1) EP0647928B1 (en)
AT (1) ATE178730T1 (en)
DE (2) DE4333707C2 (en)
DK (1) DK0647928T3 (en)

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DK0647928T3 (en) 1999-10-18
DE4333707C2 (en) 1996-12-05
ATE178730T1 (en) 1999-04-15
DE4333707A1 (en) 1995-04-06
DE59408075D1 (en) 1999-05-12
EP0647928B1 (en) 1999-04-07

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