EP0303072B1 - Montage pour projecteurs de véhicule - Google Patents

Montage pour projecteurs de véhicule Download PDF

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Publication number
EP0303072B1
EP0303072B1 EP88111645A EP88111645A EP0303072B1 EP 0303072 B1 EP0303072 B1 EP 0303072B1 EP 88111645 A EP88111645 A EP 88111645A EP 88111645 A EP88111645 A EP 88111645A EP 0303072 B1 EP0303072 B1 EP 0303072B1
Authority
EP
European Patent Office
Prior art keywords
lens
crystals
light
equipment according
reflector
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
EP88111645A
Other languages
German (de)
English (en)
Other versions
EP0303072A2 (fr
EP0303072A3 (en
Inventor
Rainer Dr.-Phys. Neumann
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0303072A2 publication Critical patent/EP0303072A2/fr
Publication of EP0303072A3 publication Critical patent/EP0303072A3/de
Application granted granted Critical
Publication of EP0303072B1 publication Critical patent/EP0303072B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/63—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates
    • F21S41/64—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices
    • F21S41/645—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices by electro-optic means, e.g. liquid crystal or electrochromic devices
    • 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
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity

Definitions

  • the invention relates to a device for headlights, in particular for motor vehicles according to the preamble of claim 1.
  • the brake light of the prior art consists of a reflector and an incandescent lamp arranged therein and has optical means arranged in the beam path of the light for influencing the rays reflected by the reflector.
  • An electro-optical disk is inserted between the reflector and the optical means and is connected to an electrical power source.
  • the disc In day mode, the disc is under tension and is then completely translucent, so that all the light emitted by the reflector is transmitted.
  • only a reduced voltage is applied, so that only part of the light beam is let through and the rest is shadowed.
  • An electro-optical pane as used in the prior art is not suitable for a low-beam headlamp.
  • a plate that completely absorbs light cannot be arranged in the dipped-beam headlamp, but so much light must be radiated onto the roadway that driving safety is ensured.
  • With electrical signals applied to the electro-optical plate no individual zones form on the pane. It is not possible to shade different zones on the electro-optical plate.
  • the invention is based on the idea of using optically bistable crystals in connection with headlights.
  • Optically bistable crystals have the property that when the optical input power is weak and when a threshold value is exceeded, they suddenly have a high output power and when the input power is reduced, with a certain hysteresis effect, they suddenly jump back from the high output power to the weak output power. If such optically bistable crystals are applied to a disk in the beam path emanating from the reflector, the light distribution and thus the illumination of the road can be optimized in accordance with the prevailing influencing factors. This makes vehicle steering easier and essentially avoids risky traffic situations. Good visibility is achieved in every road situation. With the device according to the invention, the light distribution of a headlight is automatically controlled and if the apron is too bright, the apron zones are damped.
  • an automatic switching from low beam to high beam and vice versa is achieved and an adjustment of the light distribution to the lighting conditions of the environment, that is, fog, snow or rain.
  • the device according to claim 9 enables a deflection device to use the rays emanating from the incandescent lamp arranged in the reflector to control the crystals.
  • the number of zones to be switched on the lens can be increased in an advantageous manner.
  • FIG. 1 shows a high-beam and low-beam headlamp of a conventional type with a lens in a spatial representation
  • 2 shows a diagram of the behavior of the bistable crystals as a function of the light intensity supplied to the emitted light intensity, that is to say the light transmittance or opacity
  • FIG. 3 shows a high-beam and low-beam headlight with imaging optics, likewise in a spatial representation.
  • FIG. 1 shows a device for headlights, in particular for motor vehicles, with a reflector 10 and an incandescent lamp 11 arranged therein.
  • the incandescent lamp 11 emits rays which are deflected by the reflector 10. Two of the deflected beams 14, 15 are shown, the beam path of the reflector go to the optical disc 12, which in the exemplary embodiment according to FIG. 1 is a diffusion disc 16.
  • Optically bistable crystals are arranged on the inside of the lens 16.
  • the bistable crystals which are made of semiconductor materials such. B. GaAs, InSb, CuCl, etc., have the property of being opaque at a basic light intensity and only switching from opaque to translucent at a certain light intensity radiating onto them.
  • the light rays emanating from the headlight reflector have the above basic light intensity or light intensity which is not sufficient to switch the crystals.
  • another light radiation onto the bistable crystals is required to switch the crystals.
  • the semiconductor materials or bistable crystals react to increasing light intensity, as shown in FIG. 2.
  • the light intensity I0 is shown on the abscissa and the light intensity that passes through the crystals is shown on the ordinate.
  • the incandescent lamp 11 is switched on, the light intensity I sw (see FIG. 2) radiates onto the crystals, which at this light intensity still absorb all of the light.
  • the further luminous intensity I s is also required to reach the luminous intensity I g .
  • the bistable crystals At the luminous intensity I g , the luminous intensity comes above the threshold at the reference point 17 in FIG. 2 and the bistable crystals suddenly switch from opaque to translucent.
  • the bistable crystals When the light intensity I0 is increased, the bistable crystals follow the course of the diagram curve 18 in FIG. 2.
  • the bistable crystals When the additional light intensity I s is reduced, the bistable crystals again follow the diagram curve 18 and return to the value I sw with a hysteresis effect . At this value I sw of light intensity, the bistable crystals again absorb almost all of the light.
  • the additional light intensity that is necessary for switching the optically bistable crystals is generated by a control light source, in particular a laser 20 or 30 (FIG. 1).
  • the laser must shine with the light intensity that is necessary to reach the light intensity J g .
  • a radiation splitter 32 is introduced into the laser beam of the laser light sources, which is set such that it irradiates certain zones. The more zones that are irradiated by laser light sources, the greater the resolution at the lens.
  • the laser light sources 20 and 30 were selected as examples for many, on which the function is explained in detail.
  • the incandescent lamp 11 is switched on and generates light beams which are deflected by the reflector and go in the direction of the lens 16.
  • One of these light beams emanating from the reflector 10 is the light beam 15 which strikes the diffusing screen 16.
  • the diffusing screen 16 In this zone of the diffusing screen 16, in which the light beam 15 strikes, no laser beam strikes.
  • the bistable crystals attached to the inside of the lens 16 therefore do not switch to translucency. This single zone of the lens thus blocks the light rays coming from the reflector 10.
  • Another light beam 14 coming from the reflector 10 strikes another individually separate zone of the diffusing screen 16.
  • the laser beam 31 of the laser light source 30 also radiates on this zone of the diffusing screen 16.
  • This laser beam 31 is a laser beam with a suitable wavelength (coherent light) and is switched to the light intensity which switches the bistable crystals of this zone on the inside of the lens 16 to light transmission. Switching requires only a low power, in the milliwatt range, and a point beam from the laser light source (20, 30) is sufficient for switching the individual zones. As a result, the rays from the reflector can pass through the lens 16 onto the roadway unhindered.
  • the light beam 41 which comes from the reflector 11, strikes a mirror 43 attached to the circumference of the reflector 11 and movable via a mechanical device 42.
  • the mirror is connected to a filter 44 through which the light beams coming from the reflector 10 pass and light beams more predetermined Wavelength are filtered out.
  • the filtered light beam is also suitable for switching the bistable crystals to light transmission.
  • the individual zones of the diffusing screen can be illuminated by appropriate settings of the individual mirrors 43 of the deflection devices 40. Consequently, zones that let light through and zones that block light can also be switched on the lens.
  • the laser light sources 20, 30 or the deflection device 40 are connected to devices 42 and 45, which are not shown in detail and are movable in all degrees of freedom, and which allow the laser light sources to be set in such a way that individual translucent and opaque zones are formed on the lens.
  • the devices 45 of the laser light source and the mechanical devices 42 are controlled by a data processing system 50.
  • the data processing system 50 receives its signals from a sensor system, which can also consist of a single sensor 51.
  • the sensor 51 scans the area in front of the vehicle, i. H. it determines whether an illuminated vehicle is coming towards it. whether street lights are switched on or whether there are special weather conditions such as snow, rain or fog. Consequently, it records the roadway situation in front of the vehicle in general and forwards the signals to the data processing system 24 via the connection 52.
  • the data processing system 50 has stored a variety of lane situations.
  • the data processing system 50 compares the signals of the sensor 51 with the specified values of the individual roadway situations in a target / actual comparison and now in turn outputs a certain control variable via the line 53 to the devices 42, 45 or in alternative embodiment to the laser light sources 20 and 30 further. These devices are then set on the basis of the values coming from the data processing system 50 in such a way that certain translucent and opaque zones form on the lens. This also enables an automatic high beam / low beam switching and vice versa.
  • FIG. Headlights of this type have a reflector 10, with an incandescent lamp 11 arranged in the reflector 10 and a diaphragm 3, in front of the reflector 10 and a downstream collecting lens 4 arranged in the beam direction.
  • the diaphragm 3 is a disc which is only on the side facing the reflector Side is coated with optically bistable crystals and it is in turn divided into several separate zones. If a zone of this aperture, like Described above in FIG. 1, illuminated with a predetermined light intensity, the optically bistable crystals become translucent.
  • FIG. 1 A headlight with imaging optics
  • the light beam 14 coming from the reflector 10 strikes a zone of the diaphragm 3, on which the light beam 31 also strikes, and therefore a translucent zone 55 is created here.
  • a translucent zone 55 is created here.
  • the automatic light distribution controls with optically bistable crystals can be used with ECE and SAE light distributions, with polyellipsoid headlights and in connection with conventional parabolic, homofocal and segmented reflectors.
  • the described invention can also be operated with gas discharge lamps instead of incandescent lamps.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (10)

  1. Dispositif pour projecteur, notamment pour véhicules automobiles, avec un réflecteur (10) et une lampe à incandescence (11) ou une lampe luminescente à gaz, disposée dans ce réflecteur, et avec une glace (3; 12) de transparence variable à la lumière, disposée à une certaine distance du réflecteur (10) dans la direction des rayons lumineux (14, 15) réfléchis par le réflecteur (10), afin d'influencer ces rayons lumineux (14, 15) réfléchis par le réflecteur (10) et, en outre, avec une glace diffusante (16) disposée après la glace (3; 12) sur le trajet des rayons en direction de ces rayons réfléchis (14, 15) par le réflecteur (10), dispositif caractérisé en ce que des cristaux bistables optiquement sont rapportés sur au moins une zone de la glace (12) et en ce que des sources de lumière (20, 30) susceptibles d'être commandées, et émettant une lumière cohérente, émettent des rayons lumineux (31) d'intensité prédéterminée sur les cristaux, tandis que la grandeur de cette intensité de rayonnement commute les cristaux de la transparence à la lumière sur le blocage de la lumière et inversement.
  2. Dispositif selon la revendication 1, caractérisé en ce que la glace (12) et la glace diffusante (16) sont réalisées d'une seule pièce, et en ce que les cristaux sont disposés sur un côté, notamment sur le côté interne de la glace diffusante (16).
  3. Dispositif selon la revendication 1, caractérisé en ce que la glace (3) est un écran, et en ce que les cristaux sont disposés sur un côté de l'écran (3).
  4. Dispositif selon une des revendications 1 à 3, caractérisé en ce que les cristaux sont constitués d'un matériau semi-conducteur.
  5. Dispositif selon la revendication 4, caractérisé en ce que le matériau semi-conducteur est GaAs, InSb ou CuCl.
  6. Dispositif selon une des précédentes revendications, caractérisé en ce que les sources de lumière de commande (20, 30) sont commandées par un système de traitement de données (50) en fonction de signaux de commande d'un dispositif capteur (51) détectant les conditions d'éclairage de la chaussée sur laquelle se déplace le véhicule automobile.
  7. Dispositif selon une des précédentes revendications, caractérisé en ce que la source de lumière de commande (20, 30) est une lampe supplémentaire.
  8. Dispositif selon la revendication 7, caractérisé en ce que la lampe supplémentaire (20, 30) émet une lumière laser.
  9. Dispositif selon une des revendications 1 à 6, caractérisé en ce que la lampe à incandescence (11) ou la lampe luminescente à gaz, joue le rôle de source de lumière de commande, tandis qu'il est prévu un dispositif de déviation (40), qui dirige les rayons lumineux (41) en provenance de la lampe à incansecence (11) ou bien de la lampe luminescente à gaz, à travers un filtre (44) qui est disposé sur le trajet des rayons lumineux (41) et qui laisse passer la lumière d'une longueur d'onde prédéterminée.
  10. Dispositif selon une des revendications 6 à 9, caractérisé en ce qu'il est prévu plusieurs sources de lumière de commande (20, 30) et qu'à chaque source individuelle de lumière de commande (20, 30) est respectivement associée, sur la glace (3; 12) une zone avec des cristaux.
EP88111645A 1987-08-08 1988-07-20 Montage pour projecteurs de véhicule Expired - Lifetime EP0303072B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873726478 DE3726478A1 (de) 1987-08-08 1987-08-08 Einrichtung fuer scheinwerfer, insbesondere fuer kraftfahrzeuge
DE3726478 1987-08-08

Publications (3)

Publication Number Publication Date
EP0303072A2 EP0303072A2 (fr) 1989-02-15
EP0303072A3 EP0303072A3 (en) 1990-03-07
EP0303072B1 true EP0303072B1 (fr) 1994-06-01

Family

ID=6333389

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88111645A Expired - Lifetime EP0303072B1 (fr) 1987-08-08 1988-07-20 Montage pour projecteurs de véhicule

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EP (1) EP0303072B1 (fr)
JP (1) JP2608931B2 (fr)
DE (2) DE3726478A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3844364C2 (de) * 1988-12-30 1996-07-25 Bosch Gmbh Robert Verfahren zur Steuerung der Lichtemission einer Scheinwerferanordnung eines Fahrzeugs und Scheinwerferanordnung zur Durchführung des Verfahrens
DE19548485A1 (de) 1995-12-22 1997-06-26 Bayerische Motoren Werke Ag Abblendlicht-Scheinwerfer für Fahrzeuge
DE19750495B4 (de) * 1997-11-14 2009-12-03 Automotive Lighting Reutlingen Gmbh Scheinwerferanlage für Fahrzeuge
US6742918B2 (en) 2002-04-12 2004-06-01 Guide Corporation Movable condenser lens
JP5584023B2 (ja) * 2010-06-25 2014-09-03 シャープ株式会社 前照灯
US12181147B2 (en) 2020-12-01 2024-12-31 Signify Holding, B.V. Laser-based lighting device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1261195A (en) * 1968-07-05 1972-01-26 Lucas Industries Ltd Lighting systems for road vehicles
DE2209338A1 (de) * 1972-02-28 1973-09-06 Bosch Gmbh Robert Beleuchtungssystem fuer kraftfahrzeuge
US4306772A (en) * 1977-07-06 1981-12-22 Harrigan Roy Major Photochromic light lens
FR2590965B1 (fr) * 1985-11-29 1989-02-17 Cibie Projecteurs Feu de signalisation a deux etats d'eclairement pour vehicule tel qu'un vehicule automobile

Also Published As

Publication number Publication date
EP0303072A2 (fr) 1989-02-15
EP0303072A3 (en) 1990-03-07
JPS6489101A (en) 1989-04-03
JP2608931B2 (ja) 1997-05-14
DE3726478A1 (de) 1989-02-16
DE3889803D1 (de) 1994-07-07

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