EP1258846A2 - Lentille de Fresnel segmentée - Google Patents

Lentille de Fresnel segmentée Download PDF

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Publication number
EP1258846A2
EP1258846A2 EP02010315A EP02010315A EP1258846A2 EP 1258846 A2 EP1258846 A2 EP 1258846A2 EP 02010315 A EP02010315 A EP 02010315A EP 02010315 A EP02010315 A EP 02010315A EP 1258846 A2 EP1258846 A2 EP 1258846A2
Authority
EP
European Patent Office
Prior art keywords
segments
fresnel lens
radiation
segmented
bands
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
EP02010315A
Other languages
German (de)
English (en)
Other versions
EP1258846B1 (fr
EP1258846A3 (fr
Inventor
Piero Camillo Gusi
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.)
Vimar SpA
Original Assignee
Vimar SpA
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 Vimar SpA filed Critical Vimar SpA
Publication of EP1258846A2 publication Critical patent/EP1258846A2/fr
Publication of EP1258846A3 publication Critical patent/EP1258846A3/fr
Application granted granted Critical
Publication of EP1258846B1 publication Critical patent/EP1258846B1/fr
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
    • G08B13/193—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems using focusing means

Definitions

  • the present invention relates to a segmented Fresnel lens, to be used as concentrator of infrared rays on a light-sensitive element (optical sensor), particularly for application in anti-intrusion systems or in occupancy detection systems in general.
  • infrared occupancy detection devices comprise an element able to collect and concentrate rays to maximise the signal gain and an electro-optical sensor able to receive the radiation signal.
  • Associated with the sensor is electronic circuitry able to detect fluctuations in the output signal from the sensor which are the result of the variations in the radiation signal.
  • temperature differentials of less than one degree Celsius are sufficient for the presence of a moving person or object to be detected.
  • Fresnel lens or segmented Fresnel lens that is lens consisting of a plurality of bands or segments of Fresnel lens, each of which is able to cover a certain zone of the room to be monitored, are usually used as radiation concentrating elements.
  • US 4 930 864 describes a domed system of segmented Fresnel lens associated with an infrared occupancy sensor.
  • the system of lens comprises a plurality of segments of Fresnel lens distributed on the surface of a spherical hood, each able to receive the radiation from a distinct zone centered around a corresponding optical axis and focus it in the focal region.
  • Italian utility model No. 218696 filed on 10 August 1987 describes a similar sensor with a segmented Fresnel lens, able to be inserted in a standardized wall-mounted boxes for holding electrical modules.
  • EP-0484293 describes an infrared occupancy sensor comprising a hood lens with a plurality of segments of Fresnel lens disposed in three bands one on top of the other to cause the radiation coming from the upper part, the central part and the lower part, respectively, of the room being monitored to converge on the infrared sensitive element.
  • a visual correspondence normally exists between the segments of the Fresnel lens formed on the plastic hood and the corresponding segments or ray beams that are directed onto the sensitive element by said plastic segments. This allows easy identification of the direction of the rays even at a distance.
  • the arrangement of the bands determined by the Fresnel lens segments does not always offer an absolute barrier to intercept any attempt at intrusion.
  • the object of the invention is to eliminate the drawbacks of the solutions of the prior art.
  • one object of the invention is to provide a segmented Fresnel lens in which there is no visual correspondence between the beams of radiation and the plastic segments, so as to hide the direction of the beams.
  • Another object of the invention is to provide such a segmented Fresnel lens with an orientation of the beams that allows the creation of a complete barrier able to intercept any attempt at intrusion into the room monitored by the sensor combined with the lens.
  • the lens according to the invention comprises two horizontal bands of plastic segments, to which four horizontal bands of radiation segments or radiation beams correspond. There is therefore no correspondence between the plastic segments and the radiation segments or intercept beams.
  • the four bands of radiation or intercept segments are of different vertical sizes and are divided into a different number of segments.
  • the first band has three segments, the second five, the third six and the fourth three.
  • the angular horizontal extension of the field of coverage of the lens is about 112 degrees, whilst the angular vertical extension is about 36°, plus 6° on the horizontal and -30° beneath the horizontal.
  • the first and lowest band has a coverage limited to a maximum of 1.5 metres, whilst the others create a barrier at about 7 metres.
  • the third band from the bottom with six segments has practically no inclination with respect to the horizontal.
  • the lens 1 according to the invention is called a segmented Fresnel lens because it consists of a plurality of segments or lenghts of Fresnel lens, as will be described better hereunder.
  • the lens 1 proper as shown in Figure 1, has a spherical surface and is supported by a box-shaped body 2 consisting of pairs of flat opposite facing walls.
  • the lens 1 and the supporting body 2 are normally formed in a single body by molding of plastic material.
  • guides 3 and coupling means 4 for fixing of the lens are provided on the body 2.
  • the lens 1 is geometrically divided by a line L into two horizontal bands 5, 6, each comprising nine plastic segments, seen better in the development of Figure 2.
  • the plastic segments diagrammatically indicated with S in Figures 1 and 2, related to the external geometry of the lens, do not correspond to the same number of optical segments, that is, radiation segments.
  • band C comprises three radiation segments, band B five segments, band A six segments and band D three segments again.
  • the lower band C is directed downward and has an extension of about 1.5 metres (Figure 4) with an angular coverage on the horizontal plane of about 75°.
  • the remaining three bands B, A and D create a barrier at about 7.5 metres and overall determine an angular coverage, on the horizontal plane, of about 112 degrees.
  • Figure 3 shows the radiation beams corresponding to the segments of the different bands A, B, C and D.
  • the angular extension on a vertical plane is about 36°, with an inclination of+6° upward and -30° downward.
  • Band A with six segments, the third from the bottom, has no inclination with respect to the horizontal, so as to determine the greatest concentration of rays at the typical intercept height for a person, corresponding to the level of installation of the sensor, that is, about 1.2 metres.
  • the division of the lens into four radiation bands, with a total of 17 segments, makes it possible, compared with conventional solutions, to have a greater angular coverage both on the vertical and on the horizontal, the geometrical size of the lens remaining the same.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Lenses (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Inorganic Insulating Materials (AREA)
  • Securing Globes, Refractors, Reflectors Or The Like (AREA)
  • Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
  • Geophysics And Detection Of Objects (AREA)
EP02010315A 2001-05-17 2002-05-07 Lentille de Fresnel segmentée Expired - Lifetime EP1258846B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001MI001024A ITMI20011024A1 (it) 2001-05-17 2001-05-17 Lente di fresnel segmentata
ITMI20011024 2001-05-17

Publications (3)

Publication Number Publication Date
EP1258846A2 true EP1258846A2 (fr) 2002-11-20
EP1258846A3 EP1258846A3 (fr) 2003-05-21
EP1258846B1 EP1258846B1 (fr) 2004-12-08

Family

ID=11447684

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02010315A Expired - Lifetime EP1258846B1 (fr) 2001-05-17 2002-05-07 Lentille de Fresnel segmentée

Country Status (6)

Country Link
EP (1) EP1258846B1 (fr)
AT (1) ATE284563T1 (fr)
DE (1) DE60202167T2 (fr)
ES (1) ES2233741T3 (fr)
IT (1) ITMI20011024A1 (fr)
PT (1) PT1258846E (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10663628B1 (en) 2018-06-11 2020-05-26 Toyota Motor Engineering & Manufacturing North America, Inc. Cloaking devices with fresnel mirrors and plane mirrors and vehicles comprising the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0484293A2 (fr) * 1990-10-29 1992-05-06 TEKNOX S.r.l. Détecteur de présence à infrarouge
US5442178A (en) * 1994-03-18 1995-08-15 Hubbell Incorporated Cross-over field-of-view composite Fresnel lens for an infrared detection system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0484293A2 (fr) * 1990-10-29 1992-05-06 TEKNOX S.r.l. Détecteur de présence à infrarouge
US5442178A (en) * 1994-03-18 1995-08-15 Hubbell Incorporated Cross-over field-of-view composite Fresnel lens for an infrared detection system

Also Published As

Publication number Publication date
ITMI20011024A1 (it) 2002-11-17
PT1258846E (pt) 2005-04-29
EP1258846B1 (fr) 2004-12-08
ITMI20011024A0 (it) 2001-05-17
EP1258846A3 (fr) 2003-05-21
ATE284563T1 (de) 2004-12-15
DE60202167D1 (de) 2005-01-13
DE60202167T2 (de) 2005-12-08
ES2233741T3 (es) 2005-06-16

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