EP1059621A1 - Lichtsender - Google Patents

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Publication number
EP1059621A1
EP1059621A1 EP00304883A EP00304883A EP1059621A1 EP 1059621 A1 EP1059621 A1 EP 1059621A1 EP 00304883 A EP00304883 A EP 00304883A EP 00304883 A EP00304883 A EP 00304883A EP 1059621 A1 EP1059621 A1 EP 1059621A1
Authority
EP
European Patent Office
Prior art keywords
tube
cover
light source
detector
illumination means
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.)
Withdrawn
Application number
EP00304883A
Other languages
English (en)
French (fr)
Inventor
Klaus Norbert Tusch
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.)
Colebrand Ltd
Original Assignee
Colebrand 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 GBGB9913427.2A external-priority patent/GB9913427D0/en
Priority claimed from GBGB9916795.9A external-priority patent/GB9916795D0/en
Application filed by Colebrand Ltd filed Critical Colebrand Ltd
Publication of EP1059621A1 publication Critical patent/EP1059621A1/de
Withdrawn legal-status Critical Current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
    • G08B13/194—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 image scanning and comparing systems
    • G08B13/196—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 image scanning and comparing systems using television cameras
    • G08B13/19617—Surveillance camera constructional details
    • G08B13/19619—Details of casing
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B15/00—Identifying, scaring or incapacitating burglars, thieves or intruders, e.g. by explosives
    • G08B15/001—Concealed systems, e.g. disguised alarm systems to make covert systems

Definitions

  • This invention is concerned with light transmission, and more particularly, but not exclusively, to a device for surveillance, and to a light source.
  • surveillance devices be as unobtrusive and as unrecognisable as possible.
  • a simple, undisguised camera may be unacceptable because its presence would be obvious to persons to be observed. It is accordingly an object of this invention to seek to mitigate this disadvantage, and to provide a surveillance device which does not obviously resemble a surveillance device.
  • device for surveillance including a cover, illumination means for emitting electromagnetic radiation through the cover, and a detector for detecting radiation through the cover, the cover obscuring said illumination means and said detector to the human eye.
  • a device for surveillance including illumination means, a detector and a cover, wherein electromagnetic radiation emitted by the illumination means leaves the device through the cover, and wherein electromagnetic radiation of the same wavelength enters the device through the cover and is detected by the detector, the cover obscuring said illumination means and said detector to the human eye.
  • the cover may be substantially opaque to radiation visible to human eye.
  • the radiation receiving part of the detector is preferably adjacent the cover. This reduces or prevents detection by the detector of unwanted radiation which has reflected off the inside of the cover.
  • the radiation emitted by the illumination means may be infra-red radiation.
  • Infra-red radiation is particularly advantageous for surveillance devices because it is invisible to the human eye.
  • the illumination means may be conveniently provided by an array of LEDs.
  • the detector may comprise a black and white CCD camera.
  • a light source comprising a tube having a transparent wall, and a light source holder supported within the tube to locate a light source held thereon behind the transparent wall, the tube being formed with guide means to support the holder and to allow the holder to be moved axially of the tube.
  • the tube preferably comprises an opaque generally cylindrical portion formed with an axially extending slot, said transparent wall being mounted across said slot.
  • the transparent wall is preferably plane.
  • the guide means preferably comprises two opposite axially extending recesses to receive said holder.
  • the holder preferably comprises a circuit board on which one or more lamps are mounted.
  • the light source preferably comprises a mounting for said tube.
  • the tube is preferably adjustably mounted in said mounting for relative movement about the tube axis.
  • the tube preferably comprises a ridged outer region, the ridges extending axially of the tube, and the mounting preferably comprises means for engaging said ridges.
  • the mounting preferably comprises means for partially encircling said tube.
  • the light source may comprise a plurality of said tubes, adjacent tubes being provided with electrical connector means for connecting the lamps of adjacent tubes.
  • the electrical connection means is preferably arranged to allow relative movement between said adjacent tubes about their common axis.
  • Light in this specification is intended to cover any electromagnetic radiation, visible or invisible and the wall of the light source should be transparent to radiation from the source.
  • Fig. 1 shows a plan cut-away view of a first embodiment according to the invention.
  • Fig. 2 shows a view along line X-X of the first embodiment in Fig. 1.
  • Fig. 3 shows a perspective view of a second embodiment according to the invention.
  • Figure 4 is a cross section of a tube carrying a lamp holder.
  • Figure 5 is a plan of a lamp holder removed from said tube.
  • Figure 6 is a diagram of a mounting clip engaging the tube of Figure 4.
  • a surveillance device 1 is shown in Fig. 1.
  • the device 1 comprises illumination means 2, a detector 3 and a cover 4.
  • the illumination means consists of about forty infra-red radiation emitting LEDs 11 arranged as a planar array facing the cover 4.
  • the detector 3 is a black and white CCD camera which is sensitive at least to infra-red radiation, the camera protrudes from the centre of the array of LEDs and also faces the cover 4. In this embodiment, the camera is actually sensitive to a wide range of wavelengths from blue to infra-red.
  • the cover 4 is a planar, rectangular sheet of material which is substantially transparent to infra-red radiation.
  • the cover 4 is substantially opaque to visible light, and may be substantially opaque to all wavelengths other than infra-red.
  • the detector 3 has an input aperture 5 which is substantially in contact with the inside of the cover 4.
  • the detector 3 and LEDs 11 are enclosed within a casing 6 for protection and support.
  • the casing 6 may be made of any suitable material, for example plastics or metal.
  • a bracket 7 is provided at the back of the casing 6 for attaching the device to walls, etc.
  • the bracket may be made of any suitable material, such as plastics or metal.
  • the power input port 8 provides a connection for the input power to the LEDs and the camera.
  • the communications port 9 provides a connection for the video output signal from the camera.
  • Figure 2 shows a view of the device 1 viewed along line X-X.
  • the device 1 may be attached to a wall using the bracket 7. Power is supplied to the LEDs 11 and the camera 3 through the port 8.
  • the LEDs provide infra-red illumination, which is transmitted through the cover 4 and illuminates the space in front of the device. Infra-red radiation from the space in front of the device enters the device 1 through the cover 4, and is detected by the CCD camera 3.
  • the video output signal from the camera may be transmitted along a cable connected to the communications port 9.
  • the input aperture 5 of the camera 3 is substantially in contact with the cover 4. This prevents radiation from the LEDs reflecting off the cover and immediately onto the input aperture 5 of the detector. This prevents the images recorded by the camera being degraded by reflected radiation.
  • the number of LEDs 11 in the device 1 is may be varied, and depends on the size and shape of the space available for the array. The greater the illumination required, the larger the array of LEDs required.
  • Material for the cover 4 may be obtained from ICI.
  • the device 1 is particularly suitable for covert surveillance.
  • the internal parts of the device are not visible to humans through the cover 4 because the cover is substantially opaque to visible radiation.
  • a second device 20 is shown in Fig. 3. This is a different shape to the first device 1, circular instead of rectangular.
  • the second device 20 comprises illumination means (not shown), a detector (not shown) and a cover 24.
  • the illumination means and the detector are enclosed within a casing 26.
  • the internal arrangement of the second device 20 is very similar to the first device 1, with the exception that the number and shape of the array of LEDs will be different.
  • first device 1 or the second device 20 may be provided with a radio transmitter in the device for transmitting the output video signal from the camera to a remote receiver.
  • a motorised mount could be provided instead of a bracket at the back of the device. This would allow the viewing angle of the device to be varied more readily.
  • radiation of any other suitable non-visible wavelength may be used, with appropriate modifications to the illumination means 2 and detector 3.
  • the cover should be substantially opaque to visible light, but may be transparent to all other wavelengths.
  • the surveillance device may have two modes of operation: a day mode and a night mode.
  • the cover 4 is a neutral grey filter.
  • the cover 4 is tinted so that the apparatus 2, 3, 5, 11 behind the cover is obscured.
  • the neutral grey cover will transmit substantially all wavelengths, including wavelengths visible to the human eye, but the surveillance device remains covert because the cover is tinted.
  • the camera is sensitive to visible light, and produces a colour image.
  • infra-red LEDs 11 are illuminated and the camera is sensitive to infra-red light, and produces an appropriate image.
  • the tube of Figure 4 comprises an aluminium extrusion 31 having a generally cylindrical exterior surface 32 and formed with a slot at the top.
  • a transparent window 33 is secured within the slot, the extrusion being provided with a lip 34 either side of the slot to support the edges of the window.
  • the exterior surface of the tube is smooth at the sides 35 but is formed with a plurality of axially extending ridges 36 at the bottom.
  • a pair of axially extending lugs 41 Extending inwards from the sidewalls of the tube are a pair of axially extending lugs 41, forming between them a recess 42 on each side of the tube.
  • the recesses face each other to receive a circuit board 51 along the centre of which is mounted a plurality of lamps 43.
  • the circuit board is shown in greater detail in Figure 5 and contains a positive bar 52 and a negative bar 53, one on either side of the line of lamps 43.
  • a connection 54 is made from the negative bar at one end through the lamps and a resistor 55 in series to the other end of 56 of the positive bar.
  • the circuit board can be connected by means not shown to electrical connectors at each end of the tube so that adjacent tubes can be connected together electrically to connect the lamps of one tube in parallel with the lamps of another tube across their positive and negative bars.
  • the electrical connectors are preferably arranged as slip rings in order to allow realtive movement of adjacent tubes about their common axis.
  • the circuit board 51 is supported between the lugs 41 so that the lamps 43 are located immediately below the transparent window 33 so that on energization the lamps transmit radiation through the window.
  • the mounting clip 61 illustrated in Figure 6 has resilient side arms 62 to engage the sidewalls 35 of the tube and a tooth 63 between the arms to engage a recess between adjacent ridges 36 on the bottom of the tube.
  • the azimuth of the tube 31 relative to the mounting clip 61 can be adjusted so that light is transmitted in the required direction. Insertion of the tube into the clip is facilitated by turning the tube so that the window extends approximately at right angles to the mouth of the clip since in this position the dimension of the tube parallel to the mouth of the clip is at a minimum since the window is plane and the rest of the tube is cylindrical.
  • Insertion of the tube in this orientation into the clip means that the arms 62 of the clip have to be prised apart by a minimum amount to receive the tube.
  • the tube can be turned to the desired orientation and held in that desired orientation by engagement of the tooth between adjacent ridges 16 on the bottom of the tube and the resilience of the side arms 62.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Closed-Circuit Television Systems (AREA)
  • Studio Devices (AREA)
EP00304883A 1999-06-09 2000-06-08 Lichtsender Withdrawn EP1059621A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB9913427.2A GB9913427D0 (en) 1999-06-09 1999-06-09 Light source
GB9913427 1999-06-09
GB9916795 1999-07-16
GBGB9916795.9A GB9916795D0 (en) 1999-07-16 1999-07-16 Device for surveillance

Publications (1)

Publication Number Publication Date
EP1059621A1 true EP1059621A1 (de) 2000-12-13

Family

ID=26315652

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00304883A Withdrawn EP1059621A1 (de) 1999-06-09 2000-06-08 Lichtsender

Country Status (1)

Country Link
EP (1) EP1059621A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1345444A1 (de) * 2002-03-11 2003-09-17 Inventio Ag Video Überwachungssystem mittels 3-D Halbleiterbildsensor und Infra-Rot Lichtquelle
EP1381005A1 (de) * 2002-07-08 2004-01-14 Siemens Building Technologies AG Ereignismelder mit einer Kamera
EP1548675A1 (de) * 2003-12-23 2005-06-29 Airbus Deutschland GmbH Abdeckung für eine Überwachungskamera

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59104868A (ja) * 1982-12-06 1984-06-16 Mitsubishi Electric Corp 近赤外光撮像装置
EP0230671A1 (de) * 1985-12-30 1987-08-05 Compagnie Generale D'automatisme Cga-Hbs Bewegliche Video-Überwachungsvorrichtung
EP0435007A2 (de) * 1989-12-28 1991-07-03 Emo-Elektronik Gmbh Überwachungsvorrichtung mit einer Vorderwand aus insbesondere schwarzem, für sichtbares Licht undurchlässigem Kunststoff

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59104868A (ja) * 1982-12-06 1984-06-16 Mitsubishi Electric Corp 近赤外光撮像装置
EP0230671A1 (de) * 1985-12-30 1987-08-05 Compagnie Generale D'automatisme Cga-Hbs Bewegliche Video-Überwachungsvorrichtung
EP0435007A2 (de) * 1989-12-28 1991-07-03 Emo-Elektronik Gmbh Überwachungsvorrichtung mit einer Vorderwand aus insbesondere schwarzem, für sichtbares Licht undurchlässigem Kunststoff

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 221 (E - 271) 9 October 1984 (1984-10-09) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1345444A1 (de) * 2002-03-11 2003-09-17 Inventio Ag Video Überwachungssystem mittels 3-D Halbleiterbildsensor und Infra-Rot Lichtquelle
SG107640A1 (en) * 2002-03-11 2004-12-29 Inventio Ag Door state monitoring by means of three-dimensional sensor
US6973998B2 (en) 2002-03-11 2005-12-13 Inventio Agt Door state monitoring by means of three-dimensional sensor
EP1381005A1 (de) * 2002-07-08 2004-01-14 Siemens Building Technologies AG Ereignismelder mit einer Kamera
EP1548675A1 (de) * 2003-12-23 2005-06-29 Airbus Deutschland GmbH Abdeckung für eine Überwachungskamera

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