EP0580395B1 - A PIR sensor device - Google Patents

A PIR sensor device Download PDF

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Publication number
EP0580395B1
EP0580395B1 EP93305679A EP93305679A EP0580395B1 EP 0580395 B1 EP0580395 B1 EP 0580395B1 EP 93305679 A EP93305679 A EP 93305679A EP 93305679 A EP93305679 A EP 93305679A EP 0580395 B1 EP0580395 B1 EP 0580395B1
Authority
EP
European Patent Office
Prior art keywords
pir sensor
housing
box
lens
sensor device
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
EP93305679A
Other languages
German (de)
French (fr)
Other versions
EP0580395A2 (en
EP0580395A3 (en
Inventor
Keith Adrian Gough
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.)
Bridisco Ltd
Original Assignee
Bridisco 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 Bridisco Ltd filed Critical Bridisco Ltd
Publication of EP0580395A2 publication Critical patent/EP0580395A2/en
Publication of EP0580395A3 publication Critical patent/EP0580395A3/xx
Application granted granted Critical
Publication of EP0580395B1 publication Critical patent/EP0580395B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G08B13/191—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 pyroelectric sensor means

Definitions

  • PIR passive infra-red
  • PIR sensors are usually contained within a housing of a non-translucent material to which is attached a multi-facet lens.
  • the housing contains a printed circuit board and switching components.
  • the PIR sensor In order that the PIR sensor should be contained inconspicuously as part of a lighting appliance, there is a desire to house the essential components in as small a space as possible and preferably such that it can be positioned behind the mounting plate of a typical domestic exterior light.
  • EP-A-0 484 293 describes an infra-red presence sensor having a lens housing which is attachable to a back-plate which itself is then attached to the open front of a circuit-containing box.
  • the lens housing contains only a PIR sensing element but does not house a printed circuit board upon which the necessary electronic switching components must be mounted.
  • the lens forms the entire front face of the housing.
  • a PIR sensor device comprising a housing having a closure plate and adapted to contain a PIR sensor and electronic switching components; characterised in that the housing is an integrally moulded box having a front face and containing a printed board upon which is mounted the PIR sensor and in that the front face of the box is integrally moulded with a protruding lens.
  • the device essentially comprises a housing 10 and a back plate 11.
  • the housing 10 is injection moulded from a material which is translucent to infra-red light and includes a lens 12 of generally hemispherical shape which extends forwardly from the otherwise flat front face of the housing.
  • the internal surface of the lens 12 is formed with facets 13.
  • a PIR sensor 14 and a printed circuit board with electronic switching components generally indicated at 15, are housed.
  • the printed circuit board may be retained by bonding or by fastening screws within the housing.
  • the back plate 11 is applied as a further closure for the housing, preferably by ultrasonic welding.
  • the back may be a snap-on fit and sealed with an adhesive or other sealing compound.
  • the material from which the housing is injection moulded is translucent to infra-red light and the external surface other than the lens housing 12 may be textured to render the internal components substantially invisible from the outside of the housing whilst the lens 12 will usually be smooth.
  • the housing will be 60mm long, 40mm wide and 15mm deep (excluding the lens housing 12).
  • the miniaturised and sealed PIR sensor device described herein may be positioned conveniently within the back plate of a wall-mounted lighting appliance, with the lens 12 exposed by or projecting through an aperture of some 20mm in diameter in the appliance. With this arrangement the need for a separate PIR housing beneath the appliance is avoided.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Combustion (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Measuring Fluid Pressure (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Fire Alarms (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

A miniaturised and sealed PIR sensor device adapted to be positioned within the body of a lighting appliance and comprising a housing (10) with integrally moulded lens (12) and containing a PIR sensor (14) behind the lens (12) and associated switching circuitry (15) contained within the housing (10). A sealing substance (16) fills the remaining space of the housing (10) beneath a welded-on back plate (11). The device may be located conveniently behind the mounting plate of a wall mounted lighting appliance with the lens (12) exposed by or projecting through a small aperture in the appliance. The device obviates the need for a separate PIR housing alongside of beneath the appliance.

Description

  • THIS INVENTION concerns passive infra-red (PIR) sensors which are commonly used to actuate lighting appliances when movement is detected in the vicinity of the sensor.
  • PIR sensors are usually contained within a housing of a non-translucent material to which is attached a multi-facet lens. The housing contains a printed circuit board and switching components.
  • In order that the PIR sensor should be contained inconspicuously as part of a lighting appliance, there is a desire to house the essential components in as small a space as possible and preferably such that it can be positioned behind the mounting plate of a typical domestic exterior light.
  • European Patent Specification EP-A-0 484 293 describes an infra-red presence sensor having a lens housing which is attachable to a back-plate which itself is then attached to the open front of a circuit-containing box. The lens housing contains only a PIR sensing element but does not house a printed circuit board upon which the necessary electronic switching components must be mounted. The lens forms the entire front face of the housing.
  • It is an object of the present invention to provide a PIR sensor device in which the electronic components of the switching circuit, together with a lens and the PIR sensor itself are all contained in a single housing of minimal dimensions.
  • According to the present invention there is provided a PIR sensor device comprising a housing having a closure plate and adapted to contain a PIR sensor and electronic switching components; characterised in that the housing is an integrally moulded box having a front face and containing a printed board upon which is mounted the PIR sensor and in that the front face of the box is integrally moulded with a protruding lens.
  • An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:-
  • Fig. 1 is a side elevation of a PIR sensor device made in accordance with the invention;
  • and Fig. 2 is a horizontal section taken on line II-II of Fig. 1.
  • The device essentially comprises a housing 10 and a back plate 11. The housing 10 is injection moulded from a material which is translucent to infra-red light and includes a lens 12 of generally hemispherical shape which extends forwardly from the otherwise flat front face of the housing. The internal surface of the lens 12 is formed with facets 13.
  • Thus there is formed a generally rectilinear box into which a PIR sensor 14 and a printed circuit board with electronic switching components generally indicated at 15, are housed. The printed circuit board may be retained by bonding or by fastening screws within the housing.
  • After insertion of the PIR sensor and circuit-board any residual space within the housing 10 is filled with a wax or similar sealing material 16. Finally, the back plate 11 is applied as a further closure for the housing, preferably by ultrasonic welding. Alternatively, the back may be a snap-on fit and sealed with an adhesive or other sealing compound.
  • The material from which the housing is injection moulded is translucent to infra-red light and the external surface other than the lens housing 12 may be textured to render the internal components substantially invisible from the outside of the housing whilst the lens 12 will usually be smooth.
  • Typically, the housing will be 60mm long, 40mm wide and 15mm deep (excluding the lens housing 12).
  • For connection to a lighting appliance, usually 3 wires will extend through the housing wall from the circuitry contained therein.
  • It will be appreciated that the miniaturised and sealed PIR sensor device described herein may be positioned conveniently within the back plate of a wall-mounted lighting appliance, with the lens 12 exposed by or projecting through an aperture of some 20mm in diameter in the appliance. With this arrangement the need for a separate PIR housing beneath the appliance is avoided.

Claims (7)

  1. A PIR sensor device comprising a housing (10) having a closure plate (11) and adapted to contain a PIR sensor (14) and electronic switching components; characterised in that the housing is an integrally moulded box having a front face and containing a printed board (15) upon which is mounted the PIR sensor (14) and in that the front face of the box is integrally moulded with a protruding lens (12).
  2. A PIR sensor device according to Claim 1, wherein the box is moulded from a material which is translucent to infra-red light and the lens is of generally hemispherical shape extending forwardly from the otherwise flat front face of the box, the internal surface of the lens being formed with facets.
  3. A PIR sensor device according to Claim 1 or Claim 2, wherein, behind the PIR sensor and the switching components, any residual space within the box is substantially filled with a sealing material.
  4. A PIR sensor device according to any preceding claim, wherein the printed circuit board is fixed within the box.
  5. A PIR sensor device according to any preceding claim, wherein the external surface of the box, other than the lens, is textured to render the internal components substantially invisible from the outside of the box.
  6. A PIR sensor device according to any preceding claim, wherein the closure plate is applied to the housing by ultrasonic welding, and wherein a number of wires extend through the housing wall for connection to, for example, a lighting appliance.
  7. A PIR sensor device according to any preceding claim, when positioned within a lighting appliance with the lens exposed by or projecting through an aperture in the appliance, the remainder of the device being concealed therewithin.
EP93305679A 1992-07-24 1993-07-20 A PIR sensor device Expired - Lifetime EP0580395B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9215757 1992-07-24
GB929215757A GB9215757D0 (en) 1992-07-24 1992-07-24 A pir sensor device

Publications (3)

Publication Number Publication Date
EP0580395A2 EP0580395A2 (en) 1994-01-26
EP0580395A3 EP0580395A3 (en) 1994-05-04
EP0580395B1 true EP0580395B1 (en) 1999-02-24

Family

ID=10719236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93305679A Expired - Lifetime EP0580395B1 (en) 1992-07-24 1993-07-20 A PIR sensor device

Country Status (4)

Country Link
EP (1) EP0580395B1 (en)
AT (1) ATE176961T1 (en)
DE (1) DE69323577T2 (en)
GB (2) GB9215757D0 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5729019A (en) * 1995-12-29 1998-03-17 Honeywell Inc. Split field-of-view uncooled infrared sensor
GB2345130A (en) * 1998-12-22 2000-06-28 Pyronix Ltd Intruder sensor housing
US9927301B2 (en) * 2015-10-26 2018-03-27 Bosch Security Systems, Inc. Detector lens

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL133022C (en) * 1960-07-15 1900-01-01
SE364588B (en) * 1972-04-24 1974-02-25 Pak Construction Ab
GB2012045B (en) * 1977-12-22 1982-07-21 Carbocraft Ltd Infrared surveillance systems
IE821530L (en) * 1982-06-25 1983-12-25 John Anthony Bloice Infra-red intrusion detector system
DE3342721A1 (en) * 1983-03-23 1984-09-27 Karl-Erik Lerum Morander PHOTODETECTOR SYSTEM FOR DETECTING OR MEASURING THE POSITION OF ONE OR MULTIPLE LIGHT SOURCES
GB2221984A (en) * 1988-05-11 1990-02-21 Graham Wild Optical detector
JP2621430B2 (en) * 1988-10-21 1997-06-18 松下電器産業株式会社 Light sensor
US5107120A (en) * 1989-09-22 1992-04-21 Pennwalt Corporation Passive infrared detector
US5055685A (en) * 1989-12-01 1991-10-08 Optex Co., Ltd. Infrared detecting apparatus
US5015994A (en) * 1989-12-28 1991-05-14 Grh Electronics Security light controlled by motion detector
DE69101002T2 (en) * 1990-10-29 1994-05-05 Teknox Srl Infrared presence detector.

Also Published As

Publication number Publication date
ATE176961T1 (en) 1999-03-15
EP0580395A2 (en) 1994-01-26
GB9215757D0 (en) 1992-09-09
GB2269011B (en) 1996-05-01
DE69323577T2 (en) 1999-10-14
GB9314967D0 (en) 1993-09-01
GB2269011A (en) 1994-01-26
EP0580395A3 (en) 1994-05-04
DE69323577D1 (en) 1999-04-01

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