WO1999024288A1 - Systeme d'eclairage polarise anti-eblouissant pour vehicule automobile - Google Patents

Systeme d'eclairage polarise anti-eblouissant pour vehicule automobile Download PDF

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Publication number
WO1999024288A1
WO1999024288A1 PCT/IB1998/001770 IB9801770W WO9924288A1 WO 1999024288 A1 WO1999024288 A1 WO 1999024288A1 IB 9801770 W IB9801770 W IB 9801770W WO 9924288 A1 WO9924288 A1 WO 9924288A1
Authority
WO
WIPO (PCT)
Prior art keywords
lighting system
polarized
emitting unit
observer
unit
Prior art date
Application number
PCT/IB1998/001770
Other languages
English (en)
Inventor
Nicola Ripoli
Original Assignee
Lenoci, Antonio
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 Lenoci, Antonio filed Critical Lenoci, Antonio
Priority to AU96397/98A priority Critical patent/AU9639798A/en
Publication of WO1999024288A1 publication Critical patent/WO1999024288A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/12—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of emitted light
    • F21S41/135—Polarised

Definitions

  • the present invention relates to an lighting system for vehicles.
  • it relates to an anti-dazzle lighting system, which is used most advantageously in the presence of fog or other similar adverse weather conditions.
  • the driver of the vehicle is obliged to switch the headlights to the so-called "full-beam” condition which, in addition to worsening the problems resulting from the refraction of light, may also cause blinding of the drivers of vehicles approaching on the opposite side of the road, so much so that the highway code stipulates specific penalties for those persons which use full-beam headlights in conditions which are dangerous for other drivers.
  • anti-fog lamps are illuminating lamps which emit a light of suitable wavelength - very often yellow in colour - and are situated at a short distance from the road surface so as to reduce the effect of refraction at the level of the driver's vision.
  • this device is not entirely satisfactory because, beyond a certain luminous intensity, it results in blinding both of the driver him/herself and the drivers of the vehicles approaching in the opposite direction. Moreover, in vei y foggy conditions it loses most of its effectiveness.
  • the object of the present invention is therefore that of eliminating the abovementioned drawbacks by providing a device which solves the underlying problem of dazzling refracted light.
  • an lighting system for vehicles which comprises a unit, emitting polarized light and a filtering unit which is arranged between the emitting unit and a driver, polarized substantially at 90° with respect to the light from said emitting unit.
  • the same object is achieved by using polarized light for fixed street lighting, where a filter polarized at about 90° with respect to said polarized light is located between the observer and the polarized light source.
  • a filter polarized at about 90° with respect to said polarized light is located between the observer and the polarized light source.
  • the unit A may be a polarized light source or may be a normal light source, with random polarization, which is polarized downstream, for example by means of a polarizing screen, a refraction polarizer or a Nicol prism.
  • the unit B may be a dichroic polarizing screen, but preferably consists of a device with liquid crystals which allow the polarization plane to be varied, when by this letter can be adapted to the polarization conditions of the incident light.
  • a device controlling the liquid-crystal filter which intervenes automatically or upon operation by the driver, may be provided; if necessary this would allow the filtering effect to be deactivated entirely, making the polarization plane of the filter parallel with that of the incident light, when this is required.
  • the system according to the invention exploits the principle whereby polarized light, which passes through a filter polarized at 90° with respect thereto, is almost entirely absorbed (typical absorption values are of the order of 99.95%). Therefore the direct light (continuous lines in the Figure) from the emitting unit A is completely absorbed by the filtering unit B before reaching the observer.
  • a first object of the invention is therefore achieved: the dazzling light directed from the vehicle 1 towards the vehicle 2 may be substantially eliminated, passing through the unit B of the vehicle 2, thus eliminating the danger of blinding of the driver of the vehicle 2.
  • any observer in particular the driver of the vehicle 1 , nonetheless perceives the light diffused and reflected by the illuminated objects, since, advantageously, the light which is reflected (phantom lines in the figure) for example by the road surface or by an obstacle 3, loses partly its polarization (i.e. is polarized randomly) and therefore is able to pass in part through the unit B and be visible to the observer him/herself.
  • the overall luminous intensity emitted by the emitting unit A is mostly filtered.
  • the intensity of the stimulus detected by the human organism is proportional to the logarithm of the luminous intensity striking the eye: therefore, even a substantial reduction in the luminous intensity reaching the observer will not influence to the same extent the intensity actually perceived by the human eye.
  • a further fundamental advantage of the invention consists in the fact that the light which is refracted (dotted lines in the figure) by the water droplets 4 (fog, rain, etc.), or in any case by isotropic substances, retains instead mostly the same polarization as the incident light and therefore is entirely filtered by the filtering unit B.
  • the light which is refracted by the water droplets is no longer visible to the observer and therefore no longer produces the troublesome phenomenon of diffused light mentioned above, providing excellent visibility even in night-time conditions where there is rain and fog.
  • the filtering unit B is vertically polarized so that the bothersome reflections due to the natural light striking horizontal flat surfaces are also eliminated; in this case, for correct operation of the system, the emitting unit A must emit vertically polarized light.
  • a general example may provide an indication of the advantages associated with this preferred embodiment. Natural non-polarized light striking specular surfaces is reflected polarized in a plane parallel to the surface itself. Therefore, stretches of water, owing to their horizontal nature, reflect horizontally polarized light , which is completely absorbed by the unit B only if it is polarized vertically.
  • the lighting system may be manufactured very economically by simply fitting a polarizing screen to the ordinary headlamps of a motor vehicle and providing the driver with suitable glasses having lenses which are polarized at 90° with respect to the polarizing screen of the headlamps.
  • the filtering unit could be integrated into the sun screen which is commonly provided in all motor vehicles: this embodiment has the advantage that it leaves the driver free to use the system only when desired.
  • the invention may be used not only on land vehicles, but also on boats and planes (in particular during ground handlings) which have to operate in conditions of poor visibility.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Polarising Elements (AREA)

Abstract

L'invention concerne un système d'éclairage conçu pour des véhicules automobiles et comprenant une unité d'émission de lumière polarisée et une unité de filtration située entre l'unité d'émission et un observateur et polarisée à 90° environ par rapport à la lumière produite par ladite unité d'émission. Cette unité de filtration peut être intégrée au pare-brise du véhicule ou aux verres des lunettes portées par l'observateur.
PCT/IB1998/001770 1997-11-06 1998-11-05 Systeme d'eclairage polarise anti-eblouissant pour vehicule automobile WO1999024288A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU96397/98A AU9639798A (en) 1997-11-06 1998-11-05 Antidazzle polarized lighting system for vehicles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT97MI002479A IT1296068B1 (it) 1997-11-06 1997-11-06 Sistema illuminante polarizzato anti-abbagliamento per autoveicoli
ITMI97A002479 1997-11-06

Publications (1)

Publication Number Publication Date
WO1999024288A1 true WO1999024288A1 (fr) 1999-05-20

Family

ID=11378164

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1998/001770 WO1999024288A1 (fr) 1997-11-06 1998-11-05 Systeme d'eclairage polarise anti-eblouissant pour vehicule automobile

Country Status (3)

Country Link
AU (1) AU9639798A (fr)
IT (1) IT1296068B1 (fr)
WO (1) WO1999024288A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2362206A (en) * 2000-05-12 2001-11-14 Aldersey Williams John Polarising light from vehicle headlamps
FR2846756A1 (fr) * 2002-11-04 2004-05-07 Pechon Stephane Jean Martin Le Dispositif de vision nocturne destine a la conduite

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2225691A1 (en) * 1973-04-13 1974-11-08 Auge Albert Light source dazzle elimination system - uses polarised screens at right angles
FR2437632A1 (fr) * 1978-09-27 1980-04-25 Lafourcade Claude Procede anti-eblouissant destine a filtrer la lumiere artificielle
FR2444886A1 (fr) * 1978-12-20 1980-07-18 Elfandi Patrice Application des filtres polarisants a la suppression de l'eblouissement cause par l'eclairage des vehicules
FR2743862A1 (fr) * 1996-01-23 1997-07-25 Bouillart Roland Procedes et dispositifs de polarisation pour l'amelioration de la visibilite notamment dans les mobiles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2225691A1 (en) * 1973-04-13 1974-11-08 Auge Albert Light source dazzle elimination system - uses polarised screens at right angles
FR2437632A1 (fr) * 1978-09-27 1980-04-25 Lafourcade Claude Procede anti-eblouissant destine a filtrer la lumiere artificielle
FR2444886A1 (fr) * 1978-12-20 1980-07-18 Elfandi Patrice Application des filtres polarisants a la suppression de l'eblouissement cause par l'eclairage des vehicules
FR2743862A1 (fr) * 1996-01-23 1997-07-25 Bouillart Roland Procedes et dispositifs de polarisation pour l'amelioration de la visibilite notamment dans les mobiles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2362206A (en) * 2000-05-12 2001-11-14 Aldersey Williams John Polarising light from vehicle headlamps
FR2846756A1 (fr) * 2002-11-04 2004-05-07 Pechon Stephane Jean Martin Le Dispositif de vision nocturne destine a la conduite

Also Published As

Publication number Publication date
AU9639798A (en) 1999-05-31
ITMI972479A1 (it) 1999-05-06
IT1296068B1 (it) 1999-06-09

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