EP1594099B1 - Security sensor assembly - Google Patents

Security sensor assembly Download PDF

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Publication number
EP1594099B1
EP1594099B1 EP20050252717 EP05252717A EP1594099B1 EP 1594099 B1 EP1594099 B1 EP 1594099B1 EP 20050252717 EP20050252717 EP 20050252717 EP 05252717 A EP05252717 A EP 05252717A EP 1594099 B1 EP1594099 B1 EP 1594099B1
Authority
EP
European Patent Office
Prior art keywords
detecting
obstructer
cover
circuit
sensor assembly
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
Application number
EP20050252717
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1594099A1 (en
Inventor
Hiroaki Nakamura
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.)
Optex Co Ltd
Original Assignee
Optex 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
Application filed by Optex Co Ltd filed Critical Optex Co Ltd
Publication of EP1594099A1 publication Critical patent/EP1594099A1/en
Application granted granted Critical
Publication of EP1594099B1 publication Critical patent/EP1594099B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G08B29/046—Monitoring of the detection circuits prevention of tampering with detection circuits

Definitions

  • the present invention relates to a security sensor assembly including an intruder detecting system for detecting an unauthorized entry of people entering a surveillance area and an obstructer detecting system for detecting the presence of an obstructer such as, for example, an adhesive seal and/or paint that interferes the normal operation of the security sensor assembly.
  • the intruder detecting system referred to above is generally so constructed that a passive type infrared beam detecting element, for example, may detect the difference between an object such as a person and the ambient temperature in reference to far infrared rays of light emanating from such object present within a surveillance area, as an indication of the object within such surveillance area.
  • the obstructer detecting system referred to above is utilized to detect the presence or absence of an obstructer such as a piece of tape or paint effective to intercept passage of the far infrared rays of light therethrough, which is applied to a lens or cover of a security sensor. See, for example, the Japanese Patent Applications No. 2000-040701 and No. 2000-052796 .
  • the dust tends to deposit on an outer surface of the lens or cover of the security sensor and the amount of the dust deposited increases with passage of time. If the amount of the dust deposited on the outer surface of the lens or cover increases, the amount of light transmitted through the lens or cover correspondingly decreases and, hence, the amount of light reflected from the lens or cover increases. Accordingly, both of the capability of detecting the intruder and the capability of detecting the obstructer are lowered with passage of time and, for this reason, the lens or cover has to be cleaned regularly, for example, every few months. However, depending on the site or place where the security sensor assembly is installed, the amount of the dust deposited varies and, therefore, it is indeed cumbersome to fix the time of cleaning for each of the security sensor assemblies installed at different sites or places.
  • the present invention has been devised with a view to substantially eliminating the above discussed problems and inconveniences and is intended to provide an improved security sensor assembly capable of checking change in receiving level of a light receiving element with passage of time so that the change of the receiving level can be compensated for to allow the obstructer detecting sensitivity to be maintained at an initially preset level.
  • US-A-6,377,174 discloses an intrusion detector having a sabotage surveillance device.
  • US-A-6,262,661 discloses a pressure infrared detector having an anti-masking device.
  • the present invention provides a security sensor assembly which comprises an infrared beam detecting element for detecting infrared rays of light coming from an intruder, a cover for covering a front area forwardly of the infrared beam detecting element, a light transmitting element for transmitting an obstructer detecting beam towards the cover, a light receiving element for receiving a secondary beam of the obstructer detecting beam, which is reflected from or passed through the cover, characterized by a check circuit for checking a receiving level of the light receiving element at intervals of a predetermined period, and a first adjusting circuit operable, when a received level of the secondary beam approaches an obstructer detecting threshold value, to adjust the received level so as to depart from the obstructer detecting threshold value.
  • the obstructer detecting sensitivity made available at the initial time can be maintained.
  • the term "obstructer detecting sensitivity" hereinabove and hereinafter referred to is intended to mean the difference between the received level of the secondary beam and the obstructer detecting threshold value.
  • the first adjusting circuit may adjust a transmitting level of the light transmitting element or a receiving level of the light receiving element. This feature is effective to allow the obstructer detecting sensitivity to be maintained at the initial good sensitivity.
  • the first adjusting circuit may adjust the obstructer detecting threshold value. This feature is effective to allow the obstructer detecting sensitivity to be maintained at the initial good sensitivity.
  • the security sensor assembly of the present invention may further comprise a processing circuit for processing a signal received by the infrared beam detecting element, and a second adjusting circuit for adjusting the processing circuit in association with an operation of the first adjusting circuit to bring an intruder detecting sensitivity close to a desired value.
  • the intruder detecting sensitivity can be corrected to represent the level substantially equal to the initial level at intervals of a predetermined time and, therefore, the obstructer detecting sensitivity can be maintained at the initial good sensitivity.
  • the security sensor assembly of the present invention may further comprise a warning circuit for outputting a warning signal in the event that the rate of change of the received signal of the light receiving element with time exceeds a predetermined value, so that whether or not the level correction exceeds a possible correction range can be informed by the warning signal.
  • the light transmitting element and the light receiving element may be positioned inwardly of the cover and the light receiving element receives the secondary beam reflected from the cover.
  • Fig. 1 illustrates, in a perspective representation, a security sensor assembly according to the first preferred embodiment of the present invention.
  • the security sensor assembly shown generally by 1 includes a generally rectangular box-like housing 4 made up of a generally rectangular base 2, adapted to be secured to a ceiling or a wall surface of a building, and a casing 3 fitted removably to the base 2 by means of one or more set screws (not shown) so as to cover a front area forwardly of the base 2.
  • the security sensor assembly 1 also includes a passive type far infrared beam detecting element 5 accommodated within the housing 4.
  • the casing 3 includes a generally rectangular cover 6 made of a synthetic resin such as, for example, a polyethylene resin of a kind capable of permitting far infrared rays of light F1 therethrough.
  • This cover 6 is fitted to the casing 3 so as to cover a correspondingly shaped window defined in a lower region of the casing 3.
  • the cover 6 concurrently serves as a lens such as, for example, a Fresnel lens for condensing onto the detecting element 5 the incoming far infrared rays of light which come from the outside of the security sensor assembly 1, as will be described in detail later, and entering the housing 4 through the cover 6.
  • a circuit board 10 having the far infrared beam detecting element 5 mounted thereon is positioned within the housing 4 and fixed on the base 2 with the far infrared beam detecting element 5 held at a location aligned with and substantially intermediate of the width of the cover 6.
  • FIG. 2 A circuit block diagram of the electric circuitry employed in the security sensor assembly 1 is best shown in Fig. 2 .
  • the electric circuitry in the security sensor assembly 1 of the present invention includes an intruder detecting system for detecting an unauthorized entry of people entering a surveillance area and issuing a warning signal indicative of such unauthorized entry, and an obstructer detecting system for detecting the presence of an obstructer that interferes the normal operation of the security sensor assembly.
  • the intruder detecting system will first be discussed briefly.
  • the detecting element 5 When the detecting element 5 receives infrared rays of light reflected from an intruder making, for example, an unauthorized entry into a surveillance area, the detecting element 5 issues a pulse signal i1 indicative of the receipt of the reflected infrared rays of light from the intruder.
  • This pulse signal is supplied to a received-ray signal processing circuit 15 and is, after having been subjected to such processes as amplification and wave shaping, supplied to an intruder detecting circuit 16 in the form of an amplified signal i2.
  • the intruder detecting circuit 16 monitors the amplified signal i2 and outputs an intruder detecting signal I indicative of the detection of the intruder in the event that the amplified signal i2 meets with a predetermined threshold value.
  • the light transmitting element 11 is driven by a drive circuit 21 to project an optical obstruction detecting beam L1, such as near infrared rays of light, towards an inner surface of the cover 6.
  • an optical obstruction detecting beam L1 such as near infrared rays of light
  • a portion of the obstructer detecting beam L1 which has been reflected from inner and outer surfaces of the cover 6, i.e., the reflected obstructer detecting beam L2 is received by the light receiving element 12 which light receiving element 12 in turn provides a received signal s1 indicative of the receipt of the reflected obstructer detecting beam L2 to a received signal processing circuit 22.
  • the signal s2, which has been amplified in the received signal processing circuit 22, is subsequently supplied to an obstructer detecting circuit 23 and a check circuit 24.
  • the obstructer detecting circuit 23 monitors the level of the amplified signal s2 fed from the received signal processing circuit 22 and then provides an obstructer warning S in the event that the level of the amplified signal s2 exceeds a predetermined threshold value. With this obstructer warning S, the supervisor can recognize that an obstructer, which may be an interfering label or paint, has been applied to the cover 6 to disturb the normal operation of the intruder detecting system.
  • dust tends to deposit on the surface of the cover 6 of the security sensor assembly 1 that is secured to the wall surface or the ceiling of a building.
  • the dust deposited on the surface of the cover 6 is so objectionable as to reflect the incoming obstructer detecting beam L1 from the light transmitting element 11 with the amount of the reflected obstructer detecting beam L2 increased consequently. This in turn result in increase of the level of the amplified signal s2.
  • the level of the amplified signal s2 increases correspondingly to a value approaching the predetermined threshold value preset in the obstructer detecting circuit 23 for detecting the obstructer and accordingly, the difference between the level of the amplified signal s2 corresponding to the level of the received signal s1 and the predetermined threshold value for the detection of the obstructer becomes so small that the obstructer detecting sensitivity may be sensitive enough to result in an erroneous operation.
  • a first adjusting circuit 20 shown in Fig. 3 is used for adjusting the obstructer detecting sensitivity to the initially preset detecting sensitivity, i.e., the detecting sensitivity which has initially been preset, and includes a timer 25 operable to output a check signal c to the check circuit 24 at intervals of a predetermined period, for example, every thirty days.
  • the check circuit 24 has stored therein the initial level of the amplified signal s2, which has been exhibited at the time the amplified signal s2 was supplied thereto for the first time, and, accordingly, when the check signal c is inputted, the check circuit 24 supplies a signal m indicative of the difference between the level of the input amplified signal s2 and the level of the stored amplified signal to a first amplification factor adjusting circuit 26.
  • the first amplification factor adjusting circuit 26 provides a first amplification factor adjusting signal a1 for rectifying the level difference, represented by the signal m, to the received signal processing circuit 22, causing the received signal processing circuit 22 to modify the amplification factor so that the level of the amplified signal s2 can be returned to the initial level.
  • the difference signal m is also supplied to a contamination warning circuit 30.
  • the contamination warning circuit 30 issues a contamination warning T in the event that the level of the difference signal m exceeds a predetermined value which is, for example, equal to one half the difference between the level of the initial amplified signal s2, stored in the check circuit 24, and the obstructer detecting threshold value preset in the obstructer detecting circuit 23, or in the event that the rate of change of the difference signal m exceeds one half the initial level of such signal m.
  • the contamination warning T is issued in the form of an electric signal and is informed in any suitable mode, for example, in the form of lighting, voice and/or graphical display. The supervisor when so informed by the contamination warning T can clean the dust off from the cover 6 so that the security sensor assembly 1 can resume a normal operation to detect the presence or absence of an obstructer on the cover 6.
  • a second adjusting circuit 40 shown in Fig. 3 is used to avoid reduction of the detecting sensitivity and includes a second amplification factor adjusting circuit 41.
  • the second amplification factor adjusting circuit 41 is operable in response to the difference signal m, fed from the check circuit 24, to feed a second amplification factor adjusting signal a2, necessary to increase the amplification factor of the received-ray signal processing circuit 15, to the received-ray signal processing circuit 15.
  • the signal a2 increases the amplification factor of the received-ray signal processing circuit 15 in dependence on the rate of change of the differential signal m from the initial value to compensate for reduction of the amount of light transmitted through the cover 6, whereby reduction in sensitivity of detecting the intruder resulting from the deposition of the dust on the cover 6, which sensitivity is the difference between the amplified signal i2 and the intruder detecting threshold value preset in the intruder detecting circuit 16, can be compensated for.
  • the difference signal m lowers down to a value equal to 50% of the initial value, the amplification factor of the received light signal processing circuit 15 may be increased by 50%.
  • reduction of both of the obstructer detecting sensitivity and the intruder detecting sensitivity, which results from the deposition of the dust on the cover 6, can be so corrected as to approach the initially preset value at intervals of a predetermined period, for example, every thirty days and, at the same time, the contamination warning T can be generated in the event that the amount of the dust deposited on the cover 6 exceeds a predetermined value. Accordingly, any inconveniences brought about by the deposition of the dust on the cover 6 can be substantially eliminated.
  • the light transmitting element 11 and the light receiving element 12 are positioned inwardly of the cover 6 and, hence, within the housing 4, no dust will deposit on the light transmitting and receiving elements 11 and 12 and, therefore, the precision of detecting the dust deposited on the cover 6 can advantageously be maintained at a high level.
  • Fig. 4 illustrates a circuit block diagram of the security sensor assembly according to a second preferred embodiment of the present invention.
  • the circuitry is so designed that compensation for the reduction of the obstructer detecting sensitivity brought about by the deposition of the dust on the cover 6 can be accomplished by reducing the amount of the obstructer detecting beam L1, emitted from the light transmitting element 11, by a quantity equal to the amount of a portion of the obstructer detecting beam L1 reflected from the dust particles.
  • a first adjusting circuit 20A shown by a single-dotted chain line in Fig.
  • the difference signal m can be supplied to a transmitting beam adjusting circuit 28 for adjusting the amount of the obstructer detecting beam L1 emitted from the light transmitting element 11, so that the transmitting beam adjusting circuit 28 can decrease the level of the drive signal, outputted from the drive circuit 21 for driving the light transmitting element 11, by a quantity corresponding to the amount of the level of the amplified signal s2, increased by the light reflected from the dust particles deposited on the cover 6, to thereby approach the difference signal m to the initial value.
  • Fig. 5 there is shown the security sensor assembly according to a third preferred embodiment of the present invention.
  • the security sensor 1 shown therein is so designed and so structured that the obstructer detecting beam L1 projected from the light transmitting element 11, mounted on the circuit board 10, so as to travel towards the inner surface of the cover 6 concurrently serving as a condensing lens can be received by the light receiving element 12 through a light guide member 9 facing towards the outside of the casing 3.
  • the cover 6 employed in the security sensor assembly 1 according to the third embodiment has its outer surface formed with a plurality of projections 61 for preventing an obstructer 7, which may be an interfering adhesive tape from being applied and, hence, sticking to the cover 6 and, on the other hand, for allowing the light L3 reflected from the obstructer 7 to travel towards the light receiving element 12 through the light guide member 9.
  • the light transmitting element 11 and the light receiving element 12 are separated from each other by a shielding wall 18 and, therefore, the amount of strayed light to be received by the light receiving element 12 can advantageously be minimized to thereby increase the obstructer detecting accuracy.
  • the difference signal m outputted from the check circuit 24 shown in Fig. 3 represents a negative (minus) value.
  • the first amplification factor adjusting signal a1 performs the previously described adjustment in a positive (plus) direction
  • the second amplification factor adjusting signal a2 performs the previously described adjustment in a positive (plus) direction
  • the transmitting beam adjusting circuit 28 shown in Fig. 4 performs the previously described adjustment in a positive (plus) direction
  • the contamination warning circuit 30 monitors the amount of reduction , in the negative (minus) direction to output the contamination warning T.
  • Fig. 6 illustrates the circuit block diagram of the security sensor assembly according to a fourth preferred embodiment of the present invention.
  • This electric circuitry can be employed in the security sensor assembly shown in and described with reference to Fig. 2 in connection with the first embodiment.
  • the first and second amplification factor adjusting circuits 26 and 41 both shown in Fig. 2 are replaced with first and second threshold value adjusting circuits 51 and 62 in Fig. 6 , respectively.
  • the obstructer detecting threshold value increases to keep a predetermined margin (corresponding to the detecting sensitivity), that when the level of the difference signal m exceeds the limit of adjustment, the contamination warning T is outputted and that the contamination of the cover 6 is removed by means of cleaning, the threshold value returns to the initial value.
  • the second adjusting circuit identified by 60 in this third embodiment includes the second threshold adjusting circuit 62 operable in response to the difference signal m from the check circuit 24 to output a threshold adjusting signal h2 necessary to decrease the intruder detecting threshold value of the intruder detecting circuit 16 by a level corresponding to the quantity of the level of the amplified signal i2 fed from the received light signal processing circuit 15, which is reduced by the deposition of the dust on the cover 6.
  • Fig. 7(B) is an explanatory diagram showing the operation described above and it will readily be seen that each time the difference signal m is outputted from the check circuit 24, the intruder detecting threshold value decreases to keep a predetermined margin.
  • the present invention has been described as applied to the passive type infrared beam detecting (PIR) system utilizing the far infrared beam detecting element 5 such as in any one of the foregoing embodiments of the present invention, the present invention can be equally applied to an active type detecting system utilizing microwaves, ultrasonic waves, near infrared rays of light or the like.
  • PIR passive type infrared beam detecting

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Burglar Alarm Systems (AREA)
EP20050252717 2004-05-07 2005-04-29 Security sensor assembly Expired - Lifetime EP1594099B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004138126 2004-05-07
JP2004138126A JP4576525B2 (ja) 2004-05-07 2004-05-07 防犯センサ

Publications (2)

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EP1594099A1 EP1594099A1 (en) 2005-11-09
EP1594099B1 true EP1594099B1 (en) 2008-04-30

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7414236B2 (en) 2006-06-16 2008-08-19 Hong Kong Applied Science And Technology Research Institute Co., Ltd. Monitoring devices and intrusion surveillance devices
JP5902006B2 (ja) * 2012-03-09 2016-04-13 株式会社メガチップス 監視カメラ
JP5896807B2 (ja) * 2012-03-29 2016-03-30 株式会社メガチップス 監視カメラ装置
JP7397266B2 (ja) * 2019-10-25 2023-12-13 竹中エンジニアリング株式会社 視野妨害監視機能付き検知装置
JP7592340B2 (ja) * 2021-12-24 2024-12-02 オプテックス株式会社 検知センサ

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3787712B2 (ja) * 1997-05-14 2006-06-21 株式会社日本アレフ 検知装置
JP3460542B2 (ja) * 1997-10-22 2003-10-27 松下電工株式会社 防犯検知器
EP1061489B1 (de) * 1999-06-07 2004-08-25 Siemens Building Technologies AG Intrusionsmelder mit einer Einrichtung zur Sabotageüberwachung
JP2001101541A (ja) * 1999-09-30 2001-04-13 Matsushita Electric Works Ltd 火災感知器
ATE282291T1 (de) * 1999-10-14 2004-06-15 Siemens Building Tech Ag Passiv-infrarotmelder
JP2002024952A (ja) * 2000-07-06 2002-01-25 Optex Co Ltd 妨害検知機能付き防犯センサ
JP4559664B2 (ja) * 2001-06-29 2010-10-13 ニッタン株式会社 光電分離型煙感知器および防災システム

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JP4576525B2 (ja) 2010-11-10
EP1594099A1 (en) 2005-11-09
JP2005321917A (ja) 2005-11-17

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