EP1162401B1 - Projecteur pour véhicule et dispositif d'éclairage avec au moins un tel projecteur - Google Patents

Projecteur pour véhicule et dispositif d'éclairage avec au moins un tel projecteur Download PDF

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Publication number
EP1162401B1
EP1162401B1 EP01112686A EP01112686A EP1162401B1 EP 1162401 B1 EP1162401 B1 EP 1162401B1 EP 01112686 A EP01112686 A EP 01112686A EP 01112686 A EP01112686 A EP 01112686A EP 1162401 B1 EP1162401 B1 EP 1162401B1
Authority
EP
European Patent Office
Prior art keywords
light
wavelength region
headlamp
light source
emitted
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
EP01112686A
Other languages
German (de)
English (en)
Other versions
EP1162401A2 (fr
EP1162401A3 (fr
Inventor
Johannes Eschler
Reinhold Fiess
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 EP1162401A2 publication Critical patent/EP1162401A2/fr
Publication of EP1162401A3 publication Critical patent/EP1162401A3/fr
Application granted granted Critical
Publication of EP1162401B1 publication Critical patent/EP1162401B1/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
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing light
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/337—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector having a structured surface, e.g. with facets or corrugations
    • 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
    • F21V9/04—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for filtering out infrared radiation

Definitions

  • the invention relates to a headlamp for vehicles and a lighting device with at least one such headlamp according to the preamble of claim 1.
  • Such a headlamp is known from DE 196 10 904 A1.
  • This headlight has a light source that emits light in the visible wavelength range and light in invisible wavelength range. This is basically the case with known light sources such as incandescent lamps or gas discharge lamps.
  • the headlamp also has a reflector, is reflected by the emitted light from the light source, and arranged in the beam path of the light reflected by the reflector translucent disc. During operation of the light source, the headlight emits a dimmed light beam in the visible wavelength range, which has an upper light-dark boundary.
  • the light-dark boundary of the light beam can be generated by appropriate design of the reflector and / or by a shielding device, by which a part of the light emitted by the light source and / or a part of the light reflected by the reflector beam is shielded.
  • the light emitted by the light source in invisible wavelength range is not used.
  • the light-dark border the light beam emitted by the headlamp in the visible wavelength range is necessary to avoid dazzling oncoming traffic, but this limits the visibility of the driver so that he can not recognize objects located at a greater distance.
  • EP 0 455 524 A1 discloses a lighting and display system for vehicles to assist the driver.
  • the system includes a near-infrared headlamp associated with a headlight so as to form a front projection device which emits both near-infrared and visible-spectrum light beams.
  • the projection device is divided into a compartment for the near infrared and a compartment for the visible area.
  • the headlight according to the invention with the features according to claim 1 has the advantage that light emitted by the light source in the non-visible wavelength range is used to illuminate more distant lying areas, as illuminated by the light beam with light in the visible wavelength range areas. There is no additional headlight and no additional light source required but only the deflection in the headlight.
  • the lighting device according to claim 7 has the advantage that detected by the sensor device illuminated by the light in the non-visible wavelength range and displayed on the display device for the driver so that the driver can also perceive objects located at a great distance.
  • Wavelength range The design of the illumination device according to claim 8 or claim 9 makes it possible to avoid influencing light emitted by other light sources in the non-visible wavelength range.
  • the further development of the illumination device according to claim 10 enables a predictive adaptation of a characteristic of the light beam emitted by the headlight to different parameters, such as road course, other road users or foreign objects.
  • FIG. 1 shows a vehicle with a lighting device in a schematic representation with a headlight
  • Figure 2 shows the headlight in an enlarged view
  • Figure 3 is a detail of a reflector of the headlight in an enlarged view
  • Figure 4 shows a detail of a deflection of the headlamp
  • Figure 5 a distance ago the headlight arranged screen.
  • FIG. 1 shows a vehicle, in particular a motor vehicle, with a lighting device.
  • the lighting device has at least one arranged at the front end of the body of the motor vehicle headlight 10, which will be described in more detail below.
  • two headlights 10 are provided, which are arranged near the lateral edges of the body and of which at least one headlight is designed as described below.
  • From the headlight 10 is both Light emitted in the visible wavelength range as well as light in invisible wavelength range.
  • the illumination device has a sensor device 12, by means of which the area illuminated by the non-visible light is detected in front of the vehicle.
  • the sensor device 12 may be, for example, a video camera, a CCD sensor or a CMOS sensor.
  • the sensor device 12 is connected to a display device 14, which is arranged in the field of vision of the vehicle driver and on which the region illuminated by the non-visible light is shown to the vehicle driver.
  • the display device 14 may, for example, be in the screen or a projection device with which an image of the area covered by the sensor device 12 is generated on the windshield of the vehicle.
  • the headlight 10 has a light source 20 which emits both light in the visible wavelength range and light in the invisible wavelength range, preferably in the infrared wavelength range.
  • the light source 20 may be an incandescent lamp or preferably a gas discharge lamp.
  • the light source 20 is inserted into a reflector 22, is reflected by the light emitted from the light source 20 as a light beam in the visible wavelength range.
  • the reflector 22 has a concavely curved shape and the light beam in the visible wavelength range which is reflected by the latter and exits the spotlight 10 has an upper bright-dark boundary.
  • the light-dark boundary of the light beam can be defined by a suitable shape of the Reflector 22 are generated by this light from the light source 20 emitted light is reflected such that it has the light-dark boundary.
  • a shielding device 24 may be provided which shields a portion of the light emitted by the light source 20, thereby producing the light-dark boundary, in which case the shielding device is provided by an opaque coating of a portion of the light source 20 or by a light source 20 and the reflector 22 arranged shielding can be formed.
  • a shielding device 26 may also be arranged in the beam path of the light beam reflected by the reflector 22, by which a part of the light beam is shielded and thereby the light-dark boundary is generated.
  • a translucent disc 28 is arranged, which can also form a cover of the headlamp 10 and which may consist of glass or plastic.
  • the disk 28 may be formed substantially smooth or have at least partially optical profiles 29, is deflected by the passing light and / or scattered.
  • the reflector 22 is provided on its inner side surrounding the light source 20 with a reflective coating 30, which forms a reflection surface.
  • the reflection surface of the reflector 22 may be formed smooth or divided into several facets, which adjoin one another in steps or kinks.
  • FIG. 5 shows a measuring screen 80 arranged at a distance in front of the headlight, which is illuminated by the light emitted by the headlight 10.
  • the measuring screen 80 has a horizontal center plane HH and a vertical center plane W, which extend at a point HV to cut.
  • the screen 80 represents the projection of a road ahead of the headlight, which would be illuminated accordingly.
  • the measuring screen 80 is illuminated by the light beam emitted by the headlight 10 in the visible wavelength range in a region 82.
  • the region 82 is bounded above by the light-dark boundary, which has the light beam in the visible wavelength range.
  • the light-dark boundary points to the oncoming traffic side, which is in the illustrated embodiment of the headlamp 10 for right-hand traffic, the left side of the Meß containers 80, a horizontal portion 83 which extends slightly below the horizontal center plane HH of Meß containers 80.
  • the light-dark boundary On the own traffic side, which is the right side of the measuring screen 80 in the case of right-hand traffic, the light-dark boundary has a section 84 rising from the horizontal section 83 to the right.
  • the light beam emitted by the headlight 10 in the visible wavelength range thus has a greater range on its own traffic side than on the oncoming traffic side.
  • the light-dark boundary 83, 84 prevents dazzling oncoming traffic, but does not illuminate the far-range above the light-dark boundary 83, 84.
  • a deflecting device 40 is arranged in a part of the beam path of the light emitted by the light source 20, is deflected by the light emitted from the light source 20 in the non-visible wavelength range light at least partially so that when it exits the headlight 10, a larger Range has as the light emitted by the headlight 10 in the visible wavelength range light beam.
  • the deflection device 40 is preferably designed such that through this light in the infrared wavelength range, preferably in the near infrared wavelength range is distracted.
  • Near infrared wavelength range means a wavelength range that is close to the wavelength range of visible light.
  • the deflection device 40 is preferably designed for light in the infrared wavelength range between approximately 780 nm and 1700 nm. Light in wavelength ranges that deviate greatly from the wavelength range for which the deflection device 40 is designed is at least substantially not influenced by the deflection device 40 and thus not deflected.
  • the deflection device 40 has a diffractive microstructure which forms a diffraction grating. By the deflection device 40 light is not deflected by refraction or reflection but by diffraction or diffraction.
  • the deflection device 40 is arranged as a diffractive microstructure on a partial region of the inside of the reflector 22 and has a reflective design.
  • Figure 4 a section of the deflection device 40 is shown enlarged, based on the operation of the deflection is explained.
  • the deflection device 40 has a microstructure 42, which is formed, for example sinusoidal.
  • the microstructure 42 has a period p, which is the Distance between two adjacent wave profiles is.
  • the microstructure 42 can be used as a deflection mirror for light having a main wavelength ⁇ , in which the failure angle ⁇ m can be set in wide ranges independently of the incident angle ⁇ i.
  • the angle of reflection ⁇ m can be chosen over the period p of the diffractive microstructure.
  • the reflector 22 in the region of the microstructure 42 acts like a reflector with smooth reflection surface and this light is not affected by the microstructure 42.
  • the microstructure 42 is designed for light in the near infrared wavelength range, such that this light is deflected deviating from the light in the visible wavelength range such that it has a greater range than the light in the visible wavelength range.
  • the light deflected by the microstructure 42 of the deflecting device 40 in the infrared wavelength range illuminates on the measuring screen 80 a region 88 which lies above the region 82 which is illuminated with light in the visible wavelength range.
  • the region 88 preferably adjoins the region 82 directly above the light-dark boundary 83, 84.
  • the region 82 corresponds to a near-field in front of the vehicle illuminated with light in the visible wavelength range
  • the region 88 corresponds to a far-field illuminated by infrared-wavelength light.
  • the area 88 is detected by the sensor device 12 and visible to the vehicle driver on the display device 14.
  • Figure 3 is exemplary of a Light beam 50 in the visible wavelength range whose reflection at the reflector 22 shown, which causes the light beam 50 is inclined after reflection downwards.
  • a light beam 52 in the infrared wavelength range whose deflection is represented by the microstructure 42 wherein the light beam 52 after reflection on the microstructure 42 is not or at least less inclined downwardly than the light beam 50th
  • the microstructure 42 may be applied to the reflector 22 by, for example, a machining process, a holographic exposure process, or a multistage photolithographic masking process and dry etching.
  • the fraction of the incident light in the infrared wavelength range which is diffracted into the desired order depends on the reflectivity and the diffraction efficiency of the microstructure.
  • the diffraction efficiency depends on the shape of the surface relief of the microstructure 42. As described above, the surface relief may be sinusoidal or sinusoidal in shape, which allows easy manufacturability. Alternatively, the surface relief may also be formed as a sawtooth, which allows a high diffraction efficiency.
  • the diffractive microstructure 42 of the deflecting device 40 can also be designed to be transmissive, that is transparent, and can be arranged in the beam path of the light emitted by the light source 22 or in the beam path of the light reflected by the reflector 22.
  • the microstructure 42 may in this case be arranged in particular on a partial region of the disk 28.
  • the light source 20 is designed such that it selectively emits infrared light in a limited wavelength range with high intensity.
  • the microstructure 42 of the deflection device 40 can be designed specifically for this limited wavelength range, so that the light in this wavelength range can be deflected by the microstructure 42 with high efficiency in the predetermined direction.
  • a resonance line is present in the infrared region, corresponding to the infrared light emitted with high intensity in this limited wavelength range.
  • Such a high radiation intensity in a limited infrared wavelength range can be achieved, for example, by additives for filling the light source 20, for example the gas mixture with which the glass bulb of the light source 20 is filled. This is possible in particular with a gas discharge lamp as the light source 20.
  • the light source 20 can be operated with constant electrical power or with pulsed or modulated electrical power.
  • the modulation frequency is preferably at least about 100 Hz, so that the modulation is not disturbing to the human eye.
  • the sensor device 12 is synchronously with the light source 20, that is, operated at the same modulation frequency, so that the illumination of the area 88 is detected only by this, when it is illuminated by the light source 20.
  • the sensor device 12 may in this case have an aperture 15, by means of which the incidence of light into the sensor device 12 is controlled.
  • a correlation method or a lock-in gain in the evaluation of the incident light can be applied in order to achieve interference-proof signal processing.
  • even low illuminances in the region 88 may be sufficient to be able to produce an image of the region 88 on the display device 14 with sufficient resolution.
  • a filter 16 is arranged in the beam path of the incident light in the sensor device 12, at least substantially only for the deflected by the deflector 40 and the area 88 illuminating Light is permeable. This is particularly advantageous in combination with the above-described embodiment of the light source 20, in which it emits light in a limited wavelength range with high intensity, wherein the filter 16 is transparent to light in this wavelength range.
  • the illumination device may additionally have an evaluation device 18, by means of which the region 88 detected by the sensor device 12 is evaluated with regard to at least one parameter.
  • an evaluation device 18 for example, foreign objects, the road course, in particular curves or crests, or road markings can be evaluated by the evaluation device 18 as parameters.
  • one or more actuating devices on the headlight 10 can be controlled by the latter, by a characteristic of the light emitted by the headlamp 10 in the visible wavelength range light beam is changeable.
  • a characteristic of the light emitted by the headlight 10 visible light beam for example, its range, the course in the horizontal direction or its scattering can be changed.

Claims (10)

  1. Projecteur pour véhicule avec une source lumineuse (20) qui émet de la lumière dans la gamme visible et dans la gamme non visible des longueurs d'onde, avec un réflecteur (22) qui réfléchit la lumière émise par la source lumineuse (20), et une vitre (28) transparente dans la trajectoire du faisceau de lumière réfléchie par le réflecteur (22), le projecteur (10) émettant dans la gamme visible de longueurs d'onde, un faisceau lumineux atténué qui présente une ligne de coupure supérieure (83, 84),
    caractérisé en ce qu'
    au moins dans une partie de la trajectoire du faisceau de la lumière émise par la source lumineuse (20), un dispositif de déviation (40) dévie au moins une partie de la lumière émise par la source lumineuse (20) dans la gamme non visible de longueurs d'onde pour que cette partie ait une portée plus grande que le faisceau lumineux atténué émis par le projecteur (10) dans la gamme visible de longueurs d'onde, et ainsi la lumière émise par la source lumineuse (20) dans la gamme non visible des longueurs d'onde éclaire des zones plus éloignées que les zones éclairées par le faisceau lumineux avec de la lumière dans la gamme visible des longueurs d'onde.
  2. Projecteur selon la revendication 1,
    caractérisé en ce que
    le dispositif de déviation (40) fait dévier de la lumière dans la gamme infrarouge des longueurs d'onde, de préférence de la lumière dans la gamme proche infrarouge des longueurs d'onde.
  3. Projecteur selon la revendication 1 ou 2,
    caractérisé en ce que
    le dispositif de déviation (40) possède une microstructure (42) à diffraction, formant un réseau de diffraction.
  4. Projecteur selon la revendication 3,
    caractérisé en ce que
    la microstructure (42) est réfléchissante et disposée sur au moins une zone partielle du réflecteur (22).
  5. Projecteur selon la revendication 3,
    caractérisé en ce que
    la microstructure (42) est à transmission et disposée sur au moins une zone partielle de la vitre (28).
  6. Projecteur selon l'une des revendications précédentes,
    caractérisé en ce que
    la source lumineuse (20) émet de la lumière non visible dans une gamme limitée de longueurs d'onde avec une intensité élevée, et le dispositif de déviation (40) dévie au moins pour l'essentiel seulement de la lumière dans cette gamme limitée de longueurs d'onde.
  7. Dispositif d'éclairage avec au moins un projecteur selon l'une des revendications précédentes,
    caractérisé en ce qu'
    il possède un dispositif de détection (12) sensible à la lumière déviée par le dispositif de déviation (40) dans la gamme non visible de longueurs d'onde et qui balaie une zone (88) éclairée par cette lumière, et dans le champ de visibilité du conducteur du véhicule un dispositif d'affichage (14) représente la zone (88) éclairée par la lumière dans la gamme non visible de longueurs d'onde.
  8. Dispositif d'éclairage selon la revendication 7,
    caractérisé en ce que
    la source lumineuse (20) est à fonctionnement modulaire, la fréquence de modulation étant de préférence d'au moins environ 100 Hz, et le dispositif de détection (12) possède un dispositif de synchronisation (15) qui commande l'incidence de la lumière dans le dispositif de détection (12) de façon synchrone par rapport à la modulation de la source lumineuse (20).
  9. Dispositif d'éclairage selon la revendication 7 ou 8,
    caractérisé en ce qu'
    un filtre optique associé au dispositif de détection (12) laisse passer au moins pour l'essentiel seulement dans la gamme non visible de longueurs d'onde, la lumière déviée par le dispositif de déviation (40).
  10. Dispositif d'éclairage selon l'une des revendications 7 à 9,
    caractérisé en ce qu'
    il possède également un dispositif d'exploitation (18), qui gère la zone balayée par le dispositif de détection (12) sur au moins un paramètre et relié avec au moins un dispositif de réglage agissant sur le projecteur (10) qui peut modifier en fonction d'au moins un paramètre, une caractéristique du faisceau lumineux atténué émis par le projecteur dans la gamme visible de longueurs d'onde.
EP01112686A 2000-06-08 2001-05-25 Projecteur pour véhicule et dispositif d'éclairage avec au moins un tel projecteur Expired - Lifetime EP1162401B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10028456 2000-06-08
DE10028456A DE10028456A1 (de) 2000-06-08 2000-06-08 Scheinwerfer für Fahrzeuge und Beleuchtungseinrichtung mit wenigstens einem solchen Scheinwerfer

Publications (3)

Publication Number Publication Date
EP1162401A2 EP1162401A2 (fr) 2001-12-12
EP1162401A3 EP1162401A3 (fr) 2004-03-24
EP1162401B1 true EP1162401B1 (fr) 2006-07-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP01112686A Expired - Lifetime EP1162401B1 (fr) 2000-06-08 2001-05-25 Projecteur pour véhicule et dispositif d'éclairage avec au moins un tel projecteur

Country Status (2)

Country Link
EP (1) EP1162401B1 (fr)
DE (2) DE10028456A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10209266B4 (de) * 2002-03-01 2005-02-17 Hella Kgaa Hueck & Co. Einrichtung zur automatischen Schaltung von Beleuchtungseinrichtungen bei Fahrzeugen
FR2839138B1 (fr) 2002-04-30 2005-01-07 Valeo Vision Dispositif projecteur bifonction pour vehicule automobile

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2660262A1 (fr) * 1990-04-02 1991-10-04 Renault Systeme d'eclairage et de visualisation pour vehicules.
IT1256892B (it) * 1992-07-24 1995-12-27 Carello Spa Dispositivo di illuminazione in particolare per autoveicoli
DE19610904B4 (de) * 1996-03-20 2009-11-19 Automotive Lighting Reutlingen Gmbh Abblendlichtscheinwerfer für Fahrzeuge

Also Published As

Publication number Publication date
DE10028456A1 (de) 2001-12-13
EP1162401A2 (fr) 2001-12-12
DE50110522D1 (de) 2006-09-07
EP1162401A3 (fr) 2004-03-24

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