EP1258846B1 - Lentille de Fresnel segmentée - Google Patents

Lentille de Fresnel segmentée Download PDF

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Publication number
EP1258846B1
EP1258846B1 EP02010315A EP02010315A EP1258846B1 EP 1258846 B1 EP1258846 B1 EP 1258846B1 EP 02010315 A EP02010315 A EP 02010315A EP 02010315 A EP02010315 A EP 02010315A EP 1258846 B1 EP1258846 B1 EP 1258846B1
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.)
Expired - Lifetime
Application number
EP02010315A
Other languages
German (de)
English (en)
Other versions
EP1258846A2 (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
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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
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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)

Claims (10)

  1. Lentille de Fresnel segmentée à la forme sphérique, comprenant une pluralité de segments de lentilles de Fresnel en mesure de concentrer des faisceaux de radiation respectifs sur un capteur optique (10) placé dans la région focale (11) de la lentille, et une pluralité de bandes extérieures (5, 6) de segments plastiques (S), superposées (5, 6), caractérisée en ce que le nombre de segments plastiques (S) est différent du nombre de segments de lentilles de Fresnel de sorte qu'il n'existe pas de correspondance visuelle directe entre lesdits segments plastiques (S) et lesdits segments de lentilles de Fresnel ou segments de radiation.
  2. Lentille de Fresnel segmentée selon la revendication 1, caractérisée en ce qu'elle comprend deux bandes (5, 6) de segments plastiques (S) et quatre bandes (A, B, C, D) de segments de radiation.
  3. Lentille de Fresnel segmentée selon la revendication 1 ou 2, caractérisée en ce qu'elle comprend dix-huit segments plastiques (S) et dix-sept segments de radiation.
  4. Lentille de Fresnel segmentée selon la revendication 3, caractérisée en ce que lesdits dix-sept segments de radiation occupant les quatre bandes superposées, en allant de bas en haut, sont ainsi répartis : trois dans la bande inférieure (C), cinq dans la bande intermédiaire (B), six dans la bande intermédiaire (A) et trois dans la bande supérieure (D).
  5. Lentille de Fresnel segmentée selon une revendication quelconque parmi les revendications susmentionnées, caractérisée en ce que la couverture angulaire desdits segments de radiation, dans un plan horizontal, est de 112° environ.
  6. Lentille de Fresnel segmentée selon une revendication quelconque parmi les revendications susmentionnées, caractérisée en ce que la couverture angulaire desdits segments de radiation, dans un plan vertical, est de 36°, +6° au-dessus de l'horizontal et -30° au-dessous de l'horizontal.
  7. Lentille de Fresnel segmentée selon la revendication 4, caractérisée en ce que ladite bande (A) avec six segments de radiation a une inclinaison zéro par rapport à l'horizontal.
  8. Lentille de Fresnel segmentée selon la revendication 4, caractérisée en ce que ladite bande inférieure (C) a une couverture en distance de 1,5 mètres environ, tandis que les trois bandes restantes (B, A, D) créent une barrière à 7,5 mètres environ.
  9. Lentille de Fresnel selon une revendication quelconque parmi les revendications susmentionnées, caractérisée en ce qu'elle présente un corps en forme de boíte (2) et est montée avec ledit capteur optique (11) et l'électronique de commande correspondante dans une boíte à encastrement mural à une hauteur de 1,2 mètres environ.
  10. Capteur de présence à infrarouge comprenant une lentille de Fresnel segmentée (1) en mesure de concentrer la radiation de détection sur un élément sensible ou un capteur optique (10), à laquelle une électronique de commande est associée, caractérisé en ce que ladite lentille de Fresnel segmentée (1) présente des caractéristiques selon une revendication quelconque parmi les revendications susmentionnées allant de 1 à 9.
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 EP1258846A2 (fr) 2002-11-20
EP1258846A3 EP1258846A3 (fr) 2003-05-21
EP1258846B1 true 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)

Cited By (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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69101002T2 (de) * 1990-10-29 1994-05-05 Teknox Srl Infraroter Anwesenheitsdetektor.
US5442178A (en) * 1994-03-18 1995-08-15 Hubbell Incorporated Cross-over field-of-view composite Fresnel lens for an infrared detection system

Cited By (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

Also Published As

Publication number Publication date
DE60202167D1 (de) 2005-01-13
DE60202167T2 (de) 2005-12-08
EP1258846A2 (fr) 2002-11-20
ES2233741T3 (es) 2005-06-16
PT1258846E (pt) 2005-04-29
ITMI20011024A1 (it) 2002-11-17
ITMI20011024A0 (it) 2001-05-17
EP1258846A3 (fr) 2003-05-21
ATE284563T1 (de) 2004-12-15

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