EP0235372A2 - Détecteur de rayon infrarouge - Google Patents

Détecteur de rayon infrarouge Download PDF

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Publication number
EP0235372A2
EP0235372A2 EP86116444A EP86116444A EP0235372A2 EP 0235372 A2 EP0235372 A2 EP 0235372A2 EP 86116444 A EP86116444 A EP 86116444A EP 86116444 A EP86116444 A EP 86116444A EP 0235372 A2 EP0235372 A2 EP 0235372A2
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EP
European Patent Office
Prior art keywords
infrared ray
detecting elements
ray detecting
ray detector
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
EP86116444A
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German (de)
English (en)
Other versions
EP0235372A3 (en
EP0235372B1 (fr
Inventor
Noboru Masuda
Kenji Tomaki
Tetsuo Oosawa
Michihiro Murata
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.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
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.)
Filing date
Publication date
Priority claimed from JP61029827A external-priority patent/JPS62187277A/ja
Priority claimed from JP61054398A external-priority patent/JPS62209325A/ja
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Publication of EP0235372A2 publication Critical patent/EP0235372A2/fr
Publication of EP0235372A3 publication Critical patent/EP0235372A3/en
Application granted granted Critical
Publication of EP0235372B1 publication Critical patent/EP0235372B1/fr
Expired legal-status Critical Current

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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

Definitions

  • the present invention relates to an infrared ray detector of dual structure employing infrared ray detecting elements for detecting an intruder or the like.
  • a pyroelectric infrared ray sensor has generally been employed as a detector for an intruder or the like since the same is easy to set and handle in comparison with an LED.
  • the pyroelectric infrared ray sensor is generally formed by a pyroelectric member provided with electrodes on the front and back surfaces thereof and is excellent in sensitivity to slight temperature difference, whereas the same is liable to be affected by thermal noise and may be driven by a heat source such as a light of an automobile or an abrupt change in ambient temperature.
  • the so-called dual sensor device In order to prevent erroneous operation through such noise components other than the intruder, the so-called dual sensor device has been proposed and put into practice, in which oppositely polarized two pyroelectric infrared ray detecting elements are coupled in series or parallel with each other.
  • U. S. Patent No. 3,839,640 discloses an example of such a dual sensor device.
  • This dual sensor device utilizes output of difference with signals obtained from two elements so that the two elements cancel influence through a temperature change simultaneously applied thereto or a change in ambient temperature, whereby no erroneous operation is caused by such external noise and the intruder can be stably detected.
  • Fig. 1 shows such a conventional dual sensor device.
  • first and second infrared ray detecting elements 1 and 2 are provided in a parallel manner in the vicinity of the focus F of a parabolic mirror 3.
  • the first infrared ray detecting element 1 When a detected object moves from a point ⁇ to a point ⁇ and then from the point ⁇ to a point ⁇ at uniform velocity, the first infrared ray detecting element 1 generates an output signal a as shown in Fig. 2A during the movement from the point ⁇ to the point ⁇ , and the second infrared detecting element 2 generates an output signal b during the movement from the point ⁇ to the point ⁇ .
  • Output of difference with these two signals a and b is as shown in Fig. 2B, from which it is obvious that a large signal level can be obtained.
  • Figs. 2A and 2B merely show such case where heat rays straightly enter only a light receiving surface of the dual sensor device.
  • heat rays generally enter the same from every direction in practice, and thus actual output signals are substantially as shown in Fig. 3A.
  • Fig. 3A shows output signals a and b actually obtained from the infrared ray detecting elements 1 and 2 of the dual sensor device, and the output with difference thereof is extremely lowered in output level at its center c , as shown in Fig. 3B.
  • a pyroelectric infrared ray sensor is inferior in input sensitivity and hence a large-dimensional concave parabolic mirror is employed and the infrared ray sensor is fixed in the vicinity of its focus thereby to improve the signal-to-noise ratio by increasing the amount of heat rays entering the infrared ray sensor.
  • an infrared ray detector having an excellent signal-to-noise ratio is inevitably increased in size.
  • an infrared ray detector is provided with dividing segment spherical mirror means prepared by dividing a parabolic mirror into a plurality of sections, in order to detect objects such as intruders approaching from various directions. Also in this case, the divided mirror sections themselves are increased in size in order to retain output from the infrared ray sensor in an excellent signal-to-noise ratio, and hence the entire infrared ray detector is increased in size to remarkably restrict the position of installation.
  • an infrared ray detector is mainly directed to detect the intruder, and the output from the infrared ray sensor following the intruder movement signal is in a frequency range of about 0.1 to 10 Hz.
  • the capacitor of a filter circuit is indispensably increased in capacitance to require a large space, and hence it has been difficult to reduce the size of the infrared ray detector.
  • an infrared ray detector which detects an intruder or the like through output of difference with two pyroelectric infrared ray detecting elements connected in a parallel or series manner with each other.
  • the infrared ray detector comprises a pair of electrically connected pyroelectric infrared ray detecting elements having substantially identically directed light receiving surfaces and a shield means arranged in front of the light receiving surfaces to partially shield the infrared ray detecting elements against incidence of infrared light.
  • the shield means is arranged in a plane extending between the infrared ray detecting elements to separate the same on both sides thereof.
  • shield means not only indicates that completely shielding the infrared ray detecting elements against the incident infrared light, but includes that having a selective shielding property such as a filter transmitting only infrared light having prescribed wavelength.
  • the shield means is arranged in front of the light receiving surfaces of the pyroelectric infrared ray detecting elements, thereby to obtain sufficiently large detection output in the process of movement of a detected object in front of an intermediate portion between the infrared ray detecting elements.
  • a dual sensor device 10 is formed by a pyroelectric member provided with first and second infrared ray detecting elements 10a and 10b.
  • An infrared ray transmission restricting panel 11 is arranged in front of a light receiving surface of the dual sensor device 10, and a differential signal auxiliary member 12 serving as a shield member is arranged substantially at the center of a transmission area (e.g., a hole) of the restricting panel 11.
  • the differential signal auxiliary member 12 has such a characteristic of absorbing or reflecting infrared rays of 5 to 15/ ⁇ m in wavelength radiated from an intruder, and the material therefor is appropriately selected from, e.g., plastic such as resin tape, metal and the like.
  • the infrared transmission restricting panel 11 is formed by a panel member provided with an opening in an angular, circular or other shape for allowing incidence of heat rays upon the dual sensor device 10.
  • the first detecting element 10a When, in the aforementioned structure, the detected object moves in front of the dual sensor device 10 at uniform velocity similarly to the case of Fig. 1, the first detecting element 10a generates an output signal a as shown in Fig. 6A and the second detecting element 10b generates an output signal b as shown therein through operation of the differential signal auxiliary member 12.
  • Fig. 5 shows an exemplary construction of this embodiment.
  • the dual sensor device 10 is contained in a case 13 having an opening 13a, which is provided with a filter 14 of infrared transmitting material such as polyethylene having a thick central portion 14a.
  • This filter allows the radiated light having a wavelength on the order of 4.5 to 15 ⁇ m to pass.
  • the thick central portion 14a serves as a differential signal auxiliary member, i.e., a shield member, while the peripheral portion of the opening 13a of the case 13 serves as an infrared transmission restricting panel.
  • Figs. 7A and 7B show manners of connection of the dual sensor device 10 as shown in Figs. 4 and 5.
  • Japanese Patent Laying-Open Gazette No. 32131/1983 discloses an infrared ray detector employing a single type sensor in which two infrared transmission members provided with screen-shaped infrared non-transmission members are closely opposed to each other so that one of the same is vibrated.
  • the infrared non-transmission members are not employed as auxiliary members for improving differential output as in the dual type sensor according to the present invention, but merely serve as choppers.
  • Japanese Patent Publication Gazette No. 13449/1985 discloses an infrared ray detector applied to a multielement infrared ray sensor array, in which an opening of a cold aperture is provided in the form of a lattice.
  • this infrared ray detector views from respective infrared ray sensing elements are fixed to reduce output scattering of the elements, and the same is not provided with an auxiliary member for improving differential output such as that in the dual type sensor according to the present invention.
  • an infrared ray sensor 20 is in the so-called dual structure formed by a pyroelectric member 20c which is provided thereon with two infrared ray detecting elements 20a and 20b.
  • At least one mirror member 21 is upwardly provided in the light receiving area of the infrared ray sensor 20. Namely, the mirror member 21 is arranged in a plane extending between the infrared ray detecting elements 20a and 20b to separate the same on both sides thereof.
  • the mirror member 21 has reflective surfaces on both sides to reflect heat rays (far-infrared rays) radiated from a detected object, which heat rays are in turn incident upon the infrared ray detecting element 20a or 20b.
  • the infrared ray detecting elements 20a and 20b directly receive heat rays 23 radiated from an object 22 positioned in a point (A) separated from the infrared ray sensor 20.
  • the infrared ray detecting element 20a receives the heat rays in an amount 24a of direct incidence as well as an amount 24b reflected by the mirror member 21 while incidence of the heat rays is restricted or intercepted with respect to the other infrared ray detecting element 20b.
  • both of the infrared ray detecting elements 20a and 20b directly receive the heat rays emitted from the object 22.
  • Fig. 10 conceptually shows output signals from the infrared ray detecting elements 20a and 20b in this case.
  • Symbol a denotes output levels upon direct incidence of the heat rays and symbol b denotes an output level upon incidence of the amount 24b of heat rays reflected by the mirror member 21 on the infrared detecting element 20a.
  • differential output from the infrared ray sensor 20, i.e., added output of the infrared ray detecting elements 20a and 20b connected in an opposite-polarity manner is as shown in Fig.
  • the output signal b with superpose of the amount 24b reflected by the mirror member 21 is approximately doubled in output level in comparison with the output signal a with only the amount of direct incidence and is at a high frequency level.
  • the peak value of the output signal b depends on the reflection coefficient of the mirror member 21.
  • the pulse width of the output signal b depends on the height h of the mirror member 21, i.e., the distance from the light receiving surface, the width w of the mirror member 21 and the space s between the infrared ray detecting elements 20a and 20b as shown in Fig. 8.
  • the space s is generally constant, and hence the height h and the width w of the mirror member 21 are appropriately determined in design.
  • the width w of the mirror member 21 is so determined as to temporarily restrict, or preferably prevent incidence of the heat rays upon the infrared ray detecting elements 20a and 20b, and hence the mirror member 21 may be reduced in size.
  • Dot lines a1 and b1 in Fig. 10 denote output levels in such case where difference phase is caused in the heat rays entering the infrared ray detecting elements 20a and 20b by the space s , and differential output levels in this case are shown by dot lines a and d in Fig. 11.
  • a two-dot chain line 25 denotes the plane separating the infrared ray detecting elements 20a and 20b.
  • the infrared ray detecting element 20b receives an amount 26a of direct incidence in superpose with a reflected amount 26b. It is obviously understood from Figs 10 and 11 that the output levels are symmetrical with respect to a point (B) as the result.
  • an infrared ray sensor 20 of dual structure is formed by a pyroelectric member 20c provided thereon with two infrared ray detecting elements 20a and 20b.
  • the back surface of the pyroelectric member 20c is fixed to a ceramic substrate (not shown) through an electrode, and the infrared ray sensor 20 is contained in a case 27 having an entrance window as shown in Figs. 12 and 13.
  • a U-shaped mirror member 29 is provided in a plane separating the two infrared ray detecting elements 20a and 20b across a light receiving surface 28 of the infrared ray detector 20.
  • the mirror member 29 has optical reflective surfaces on both sides thereof, and is about 0.5 mm in thickness and about 6 to 7 mm in length (width) in a direction perpendicular to the light receiving surface 28.
  • the case 27 is made of plastic, and contains an FET, a filter circuit and the like.
  • Numeral 30 denotes terminals.
  • the infrared ray detecting elements 20a and 20b receive the heat rays 23 emitted from the intruder 22, thereby to develop smoothly increased output voltages a1 and b1 as shown in Fig. 14.
  • the mirror member 21 starts serving as a shield means for the infrared ray detecting member 20b with the intruder 22 along the arrow, whereby the infrared ray detecting element 20b is completely shielded against the heat rays and the output voltage thereof becomes zero as shown by b2 in Fig. 14.
  • the infrared ray detecting element 20a receives the heat rays in the amount 24b reflected by the mirror member 21 in addition to the amount 24a directly received from the intruder 22, and the total amount of heat rays entering the infrared ray detecting element 20a is substantially twice that of direct incidence.
  • the output voltage developed in the infrared ray detecting element 20a is abruptly increased as shown by a2 in Fig. 14.
  • the mirror member 21 terminates reflection of the heat rays with respect to the infrared ray detecting element 20a.
  • a two-dot chain line 31 in Fig. 14 indicates such case where the human body 22 is in a position right in front of the mirror member 21, in which the heat rays directly apply the infrared ray detecting element 22b.
  • the infrared ray detecting element 20a With further movement of the intruder 22, the infrared ray detecting element 20a is in turn shielded against the heat rays by the mirror member 21, whereby its output voltage is abruptly lowered as shown by a3 in Fig. 14. Thereafter the infrared ray detecting element 20a is released from the influence by the mirror member 21 to again receive the heat rays directly from the intruder 22. On the other hand, the infrared ray detecting element 20b additionally receives the amount 26b of heat rays reflected by the mirror member 21 with the movement of the intruder 22, whereby its output voltage is temporarily increased as shown by b3 in Fig. 14.
  • output obtained from the infrared ray sensor 20 appears as differential output of the output signals from the infrared ray detecting elements 20a and 20b, and hence pulse-like output signals a and b having high peak values are obtained as shown in Fig 15. Since the mirror member 21 exerts influence on the velocity of the intruder 22 for a short time, the output signals a and b are higher in frequency than output signals V a and V b with direct incidence of the heat rays.
  • Fig. 16 illustrates an example of an amplifier employed in the present invention and contained in the case 27.
  • the infrared detecting elements (detectors) 20a and 20b are connected in series with each other in an opposite-polarity manner, and output signals thereof are supplied to an amplifier AMP through an impedance conversion circuit formed by a field-effect transistor (FET).
  • An electrical active filter circuit formed by a capacitor C and a resistor R is connected to the input part of the amplifier AMP, whose negative feedback circuit is formed by a capacitor C1 and a resistor R1.
  • the amplifier AMP is so formed as to be in such bandwidth corresponding to the band of the signals obtained from the infrared ray sensor 20 as shown in Fig. 17.
  • the lower cut-off frequency f1 of the bandwidth is determined by the capacitor C and the resistor R, while the higher cut-off frequency f2 is determined by the capacitor C1 and the resistor R1.
  • the output frequency of the infrared ray sensor according to this embodiment can be increased to about 10 Hz in comparison with the conventional case of about 1 Hz, and hence, e.g., the capacitor C for determining the lower cut-off frequency f1 can be minimized to about 1/13 in volume ratio, whereby the intruder infrared ray detector can be remarkably reduced in size.
  • Figs. 18 and 19 respectively illustrate directivity of a sensing region of the inventive infrared ray detector provided with the mirror member 29.
  • a sensing region in the plane of the X and Y axes is wider along the plan of the mirror member 29, i.e., along the X axis and narrower in the direction perpendicular to the plane of the mirror member 29, i.e., along the Y axis, as obvious from Fig. 18.
  • a sensing region in the plane of the Y and Z axes protrudes in a direction perpendicular to the light receiving surface 28, i.e., along the Z axis as shown in Fig. 19.
  • the sensing region has directivity by provision of the mirror member 29.
  • the infrared ray detector according to the present invention may be mounted on, e.g., the ceiling of a passageway to provide a watching space across the detecting zone.
  • a light transmission restricting panel 32 as shown in Fig. 20 may be provided in the light receiving area.
  • difference phase is caused by the gap between infrared ray detecting elements 20a and 20b upon incidence of heat rays.
  • the infrared ray detecting element 20b develops an output signal in a phase delay to that of the infrared ray detecting element 20a, and differential output from the infrared ray sensor 20 includes signals c and d having low peak values and low frequency levels and signals a and b having high peak values and high frequency levels as shown in Fig. 21.
  • the low-frequency signals c and d are removed by a band-pass filter as shown in Fig. 16, so that the high-frequency signals a and b are outputted from the infrared ray sensor 20.
  • the fourth embodiment is a modification of the embodiment as shown in Figs. 8 and 11, and is provided with a plurality of mirror members as shield members.
  • Fig. 22 is a sectional view showing the fourth embodiment.
  • An infrared ray sensor 50 of dual structure is formed by a pyroelectric member provided thereon with two parallel-connected infrared ray detecting elements and fixed to one surface of a ceramic substrate 56, to be contained in a metal case 58 having an entrance window 57 sealed by window material
  • An impedance conversion circuit 59 is arranged on the other surface of the ceramic substrate 56, to provide an independent sensor portion 60 as a whole.
  • the sensor portion 60 is mounted in a central space 62 of a frame member 61 made of plastic, with the entrance window 57 directed to the exterior.
  • Six mirror members 63 are upwardly provided at regular intervals along the central space 62, to be covered by a plastic cover 64.
  • the frame member 61 is formed in the side provided with the mirror member 63, i.e., in the front surface thereof with a ring-shaped groove 65 concentric with the space 62, while through-holes 66 are provided in two portions of the bottom of the groove 65 oppositely through the space 62.
  • the mirror members 63 are partially integrally connected to a ring-shaped base portion 67 at the bottom sides thereof, to be directed to the center of the ring-shaped base portion 67.
  • the ring-shaped base portion 67 is inserted in the ring-shaped groove 65 of the frame member 61 so that bottom edges 68 of the mirror members 63 are placed in intervals 70 between respective protrusions 69 to fix the spaces therebetween.
  • the size of each mirror member 63 in the central direction is selected to be in such length that its forward end portion protrudes in the central space 62 of the frame member 61 not to reach the center thereof, e.g., 6 to 10 mm.
  • each mirror member 63 has an arcuate outer edge 71, whose height is about 5 to 12 mm.
  • This mirror member 63 is prepared by pressing or bending metal such as iron, nickel and phosphor bronze, and both surfaces thereof are specularly worked by plating, evaporating or sputtering of chromium, aluminum or the like to provide optical reflective surfaces reflecting the light having the wavelength of 5-10 ⁇ m, which are about 0.1 to 0.5 mm in thickness.
  • the plastic cover 64 is prepared by infrared transparent material such as polyethylene resin which transmits infrared rays of 5 to 10 ⁇ m in wavelength emitted from an intruder, and its thickness is about 0.5 mm.
  • the frame member 61 can be divided into two parts along a mating face 72, and is provided therein with a circuit 73 for processing signals detected by the infrared ray sensor 50.
  • This circuit 73 is formed by an electrical active filter circuit and an amplifier similarly to the circuit as shown in Fig. 16, and may contain a DC power supply circuit, AC power rectifying circuit, a DC amplifier, a comparator, a converter and the like at need.
  • Fig. 24 shows actual output V from the infrared ray detecting elements 50a and 50b in this embodiment.
  • the heat rays emitted from the intruder straightly and simultaneously apply the infrared ray detecting elements 50a and 50b from a point separated from the infrared ray sensor 50. Therefore, output voltages a1 and a2 of the infrared ray detecting elements 50a and 50b are smoothly increased with approach of the intruder to reach saturation points.
  • the mirror member serves as a thermal shield to one of the infrared ray detecting elements 50a and 50b to completely shield the same against the heat rays emitted from the intruder, whereby the output level of the infrared ray detecting element becomes zero as shown by b2.
  • the other infrared ray detecting element receives the heat rays reflected by the mirror member in addition to those directly emitted from the intruder, and the amount of the heat rays as received is substantially twice that of direct incidence.
  • the output voltage a2 of the other infrared ray detecting element is abruptly increased.
  • both of the infrared ray detecting elements receive only heat rays directly emitted from the intruder.
  • the two-dot chain line 15 denotes such case where the intruder moves to a point directly in front of the mirror member.
  • the other infrared detecting ray element is in turn shielded by the mirror member to form a trough a3 and a peak b3.
  • the output from the infrared ray sensor 50 appears as the differential output of the infrared ray detecting elements 50a and 50b, to provide pulse-like output voltages b and c higher in peak value than output voltages a and d with only direct incidence of heat rays, similarly to the case shown in Fig. 11. Further, the output voltages b and c are at high frequency levels since the mirror members exert influence on the velocity of movement of the intruder for a short time.
  • this embodiment employs six mirror members 63a to 63f each having the aforementioned function.
  • the sensing region in this case is remarkably enlarged in comparison with a sensing region 74 with no mirror member provided, on a plane formed by an X axis in the horizontal direction of Fig. 22 and a Y axis perpendicular thereto in the plane direction of the mirror members 63a to 63f as shown in Fig. 25, with the so-called directivity.
  • the reflecting functions of the mirror members are particularly remarkable in the direction of the plane separating the two infrared ray detecting elements 50a and 50b, i.e., on the X axis.
  • the number of the mirror members and the relation therebetween are not restricted to the same.
  • the mirror members 63e and 63f in Fig. 25 may be removed so that sensitivity is lowered in the upper portion in the drawing.
  • the mirror members 63b and 63e may be removed to retain sensitivity in a biased direction.
  • the angle between each adjacent pair of the mirror members 63a to 63f is 60° in Fig. 23, the angle between, e.g., the mirror members 63b and 63c may be 120°. In other words, the number of and the angle between the mirror members in this embodiment can be freely determined in design.
  • the sensing region is remarkably extended along the X axis while the same is not much extended in other directions as obvious from Fig. 25. This is because the amount of reflected light is decreased by the angles of arrangement of the mirror members 63b, 63c, 63e and 63f.
  • circular three-terminal infrared ray detecting elements 75 and 76 each comprising two series-connected infrared ray detecting elements in a concentric manner while electrodes 75a, 75b, 76a and 76b on both ends are displaced by 90° in position.
  • the infrared ray detecting elements 75 and 76 are substantially identical in area so as to generate identical output signals upon incidence of the same amount of heat rays. Further, the infrared ray detecting elements 75 and 76 are polarized in the directions of the electrodes 75c and 76c in both side portions thereof as shown by arrows, while these infrared ray detecting elements 75 and 76 are connected in a parallel manner to, e.g., the impedance conversion circuit as shown in Fig. 7A.
  • the sensing region can be prevented from extension in a specific direction (along X axis) as shown in Fig. 25, so that the sensing region can be made substantially even along the plane direction of crosswisely arranged mirror members 77a to 77d as shown in Fig. 27.
  • Such an infrared ray sensor is effectively mounted on, e.g., the ceiling of a diverging point of a detecting zone.

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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)
EP19860116444 1986-02-12 1986-11-26 Détecteur de rayon infrarouge Expired EP0235372B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP61029827A JPS62187277A (ja) 1986-02-12 1986-02-12 焦電型赤外線検出装置
JP29827/86 1986-02-12
JP61054398A JPS62209325A (ja) 1986-03-11 1986-03-11 焦電形赤外線検出装置
JP54398/86 1986-03-11

Publications (3)

Publication Number Publication Date
EP0235372A2 true EP0235372A2 (fr) 1987-09-09
EP0235372A3 EP0235372A3 (en) 1988-09-21
EP0235372B1 EP0235372B1 (fr) 1992-02-05

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EP19860116444 Expired EP0235372B1 (fr) 1986-02-12 1986-11-26 Détecteur de rayon infrarouge

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EP (1) EP0235372B1 (fr)
DE (1) DE3683843D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0296766A2 (fr) * 1987-06-19 1988-12-28 Sanyo Electric Co., Ltd. Système de détection d'intrusion
WO1998013235A1 (fr) * 1996-09-26 1998-04-02 Connelly Corporation Detection pyroelectrique d'une intrusion dans un vehicule a moteur
WO1999053278A1 (fr) * 1998-04-15 1999-10-21 Steinel Gmbh & Co. Kg Dispositif detecteur et procede destine au fonctionnement d'un dispositif detecteur
US6390529B1 (en) 1999-03-24 2002-05-21 Donnelly Corporation Safety release for a trunk of a vehicle
US6480103B1 (en) 1999-03-24 2002-11-12 Donnelly Corporation Compartment sensing system

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6485081B1 (en) 1999-03-24 2002-11-26 Donnelly Corporation Safety system for a closed compartment of a vehicle
US6783167B2 (en) 1999-03-24 2004-08-31 Donnelly Corporation Safety system for a closed compartment of a vehicle
WO2002047942A2 (fr) 2000-11-16 2002-06-20 Donnelly Corporation Systeme de detection d'occupation d'un compartiment de vehicule
EP1817760B1 (fr) 2004-11-22 2014-03-12 Magna Electronics Inc. Systeme de detection de l'occupant pour vehicule
CN104627030A (zh) 2013-11-13 2015-05-20 光宝科技股份有限公司 载具安全系统及应用于其上的安全侦测与处理方法
US9405120B2 (en) 2014-11-19 2016-08-02 Magna Electronics Solutions Gmbh Head-up display and vehicle using the same

Citations (4)

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Publication number Priority date Publication date Assignee Title
US3760399A (en) * 1971-12-20 1973-09-18 Barnes Eng Co Intrusion detector
GB2047886A (en) * 1979-04-23 1980-12-03 American District Telegraph Co Passive infrared intrusion detection system
US4245217A (en) * 1958-02-22 1981-01-13 Heimann Gmbh Passive infrared alarm device
EP0080114A1 (fr) * 1981-11-25 1983-06-01 Eltec Instruments AG Détecteur de rayonnement avec plusieurs éléments sensibles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245217A (en) * 1958-02-22 1981-01-13 Heimann Gmbh Passive infrared alarm device
US3760399A (en) * 1971-12-20 1973-09-18 Barnes Eng Co Intrusion detector
GB2047886A (en) * 1979-04-23 1980-12-03 American District Telegraph Co Passive infrared intrusion detection system
EP0080114A1 (fr) * 1981-11-25 1983-06-01 Eltec Instruments AG Détecteur de rayonnement avec plusieurs éléments sensibles

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0296766A2 (fr) * 1987-06-19 1988-12-28 Sanyo Electric Co., Ltd. Système de détection d'intrusion
EP0296766A3 (en) * 1987-06-19 1989-12-13 Sanyo Electric Co., Ltd. Intrusion detection system
US4943800A (en) * 1987-06-19 1990-07-24 Sanyo Electric Co., Ltd. Intrusion detection system using three pyroelectric sensors
WO1998013235A1 (fr) * 1996-09-26 1998-04-02 Connelly Corporation Detection pyroelectrique d'une intrusion dans un vehicule a moteur
US6166625A (en) * 1996-09-26 2000-12-26 Donnelly Corporation Pyroelectric intrusion detection in motor vehicles
US6515582B1 (en) 1996-09-26 2003-02-04 Donnelly Corporation Pyroelectric intrusion detection in motor vehicles
US6762676B2 (en) 1996-09-26 2004-07-13 Donnelly Corp. Vehicle compartment occupancy detection system
WO1999053278A1 (fr) * 1998-04-15 1999-10-21 Steinel Gmbh & Co. Kg Dispositif detecteur et procede destine au fonctionnement d'un dispositif detecteur
US6597287B1 (en) 1998-04-15 2003-07-22 Steinel Gmbh & Co. Kg Sensor device and method for operating a sensor device
US6390529B1 (en) 1999-03-24 2002-05-21 Donnelly Corporation Safety release for a trunk of a vehicle
US6480103B1 (en) 1999-03-24 2002-11-12 Donnelly Corporation Compartment sensing system
US6621411B2 (en) 1999-03-24 2003-09-16 Donnelly Corporation Compartment sensing system

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EP0235372A3 (en) 1988-09-21
EP0235372B1 (fr) 1992-02-05
DE3683843D1 (de) 1992-03-19

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