EP3835649A1 - Adaptiver scheinwerfer für kfz - Google Patents

Adaptiver scheinwerfer für kfz Download PDF

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Publication number
EP3835649A1
EP3835649A1 EP19215476.3A EP19215476A EP3835649A1 EP 3835649 A1 EP3835649 A1 EP 3835649A1 EP 19215476 A EP19215476 A EP 19215476A EP 3835649 A1 EP3835649 A1 EP 3835649A1
Authority
EP
European Patent Office
Prior art keywords
lens
light
light emitting
emitting diodes
adaptive headlight
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.)
Withdrawn
Application number
EP19215476.3A
Other languages
English (en)
French (fr)
Inventor
Shih-Hsien Huang
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.)
TYC Brother Industrial Co Ltd
Original Assignee
TYC Brother Industrial Co Ltd
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 TYC Brother Industrial Co Ltd filed Critical TYC Brother Industrial Co Ltd
Priority to EP19215476.3A priority Critical patent/EP3835649A1/de
Publication of EP3835649A1 publication Critical patent/EP3835649A1/de
Withdrawn legal-status Critical Current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
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • 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
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • 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
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/26—Elongated lenses
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/265—Composite lenses; Lenses with a patch-like shape
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • 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
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • 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
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources

Definitions

  • the disclosure relates to a headlight, more particularly to an adaptive headlight.
  • a conventional adaptive headlight mounted on a vehicle is capable of adjusting illumination intensity and range of the conventional adaptive headlight on the road area in front of the vehicle.
  • a vehicle 91 mounted with a conventional adaptive headlight is traveling on a road 90, and an illumination area formed by the conventional adaptive headlight is indicated by grey regions.
  • the conventional adaptive headlight turns off those of the light emitting elements which irradiate on portions of the illumination area within which the drivers in the oncoming vehicles 92 are subject to discomforting glare.
  • an object of the disclosure is to provide an adaptive headlamp capable of providing light beams with a relatively high collimation and directivity.
  • an adaptive headlight includes at least one light emitting module and a control circuit.
  • the light emitting module includes a first lens, a light emitting unit, and a second lens.
  • the first lens has a first light incident surface facing rearward and a first light output surface facing forward and opposite to the first light incident surface along a front-rear direction.
  • the light emitting unit is disposed behind the first lens and includes a plurality of light emitting diodes arranged side-by-side along a left-right direction which is transverse to the front-rear direction.
  • the second lens is disposed in front of the first lens, is spaced apart from the first lens 3 in the front-rear direction, and is configured to form a focal curve behind the light emitting diodes.
  • the control circuit is communicatively connected to the light emitting diodes and is configured to change intensity of a light beam that is emitted by at least one of the light emitting diodes according to a position of a moving object in front of the adaptive headlight and a distance between the at least one light emitting module and the moving object.
  • the light beam emitted by the at least one of the light emitting diodes corresponds to the moving object.
  • the light beam emitted from the light emitting diode propagates into the first light incident surface of the first lens, and is refracted by the first lens to form a virtual light source of the light emitting diode.
  • the virtual light source of each of the light emitting diodes is arranged on the focal curve formed by the second lens.
  • the light beam of each of the virtual light sources propagates outwardly of the first lens 3 via the first light output surface and then propagates through the second lens.
  • an adaptive headlight also known as an adaptive driving beam (ADB) headlight
  • ADB adaptive driving beam
  • the adaptive headlight is to be mounted on a vehicle (not shown) .
  • the adaptive headlight includes two light emitting modules 1 and a control circuit 2.
  • the light emitting modules 1 are arranged side-by-side in a left-right direction (T).
  • Each of the light emitting modules 1 includes a first lens 3, a light emitting unit 4, a light grating 5 and a second lens 6. Since the structures of the light emitting modules 1 are the same, only one of the light emitting modules 1 will be described in the following disclosure for the sake of brevity.
  • the first lens 3 has a first light incident surface 31 facing rearward, and a first light output surface 32 facing forward and opposite to the first light incident surface 31 along a front-rear direction (L) transverse to the left-right direction (T) .
  • the first lens 3 includes a plurality of lens portions 321 arranged along the left-right direction (T).
  • Each of the lens portions 321 has a front surface facing forward and protruding forwardly along the front-rear direction (L), and the front surfaces of the lens portions 321 cooperatively form the first light output surface 32.
  • each of the lens portions 321 is a convex lens.
  • the first lens 3 is made of, e.g., an acrylic material but the material adopted for making the first lens 3 is not limited to this example. The acrylic material provides advantages of low cost, and a relatively good manufacturing accuracy and molding stability, let alone the cost of a mold for forming an acrylic lens is relatively low.
  • the light emitting unit 4 is disposed behind the first lens 3, and includes a substrate 41 and a plurality of light emitting diodes 42 arranged side-by-side along the left-right direction (T) on the substrate 41.
  • the light emitting diodes 42 face the first light incident surface 31 and are aligned respectively with the lens portions 321 along the front-rear direction (L).
  • the light grating 5 is disposed between the light emitting unit 4 and the first lens 3, and includes a plurality of elongated walls 51 that are spaced apart from one another along the left-right direction (T). Each adjacent pair of the elongated walls 51 defines a light channel 52 that is aligned with a respective one of the light emitting diodes 42 along the front-rear direction (L) and that is aligned with a respective one of the lens portions 321 along the front-rear direction (L). Each of the light channels 52 allows a portion of a light beam emitted by the respective one of the light emitting diodes 42 to pass therethrough.
  • the light grating 5 can be made of plastic or metal and each of the light channels 52 is, e.g., rectangular in shape.
  • the second lens 6 is disposed in front of the first lens 3, is spaced apart from the first lens 3 in the front-rear direction (L), and is configured to form a focal curve (C), i.e., a Petzval curve, behind the light emitting diodes 42. Further detail of the focal curve (C) will be described hereinafter.
  • the second lens 6 has a second light incident surface 61 and a second light output surface 62.
  • the second light incident surface 61 faces the first light output surface 32 of the first lens 3.
  • the second light output surface 62 faces forward and is opposite to the second light incident surface 61 along the front-rear direction (L).
  • the second lens 6 is constituted by a plurality of lens structures arranged along the left-right direction (T) .
  • Each of the lens structures is a convex lens and is configured to have a focal point falling behind the light emitting diodes 42.
  • the focal points of the lens structures cooperatively define the focal curve (C), and the focal curve (C) disposed behind the light emitting diodes 42 protrudes rearwardly.
  • the second lens 6 is substantially a convex lens, and includes a peripheral portion and a center portion having a thickness along the front-rear direction (L) larger than that of the peripheral portion.
  • the light grating 5 of the light emitting module 1 and the substrate 41 of the light emitting unit 4 are connected together and then the first lens 3 is mounted in front of the grating 5.
  • a frame (not shown) can be provided to mount the second lens 6 and an assembly of the first lens 3, the light grating 5 and the light emitting unit 4 on the frame, so that the second lens 6 is connected to the assembly of the first lens 3, the light grating 5 and the light emitting unit 4 by the frame.
  • the second lenses 6 of the light emitting modules 1 are disposed side-by-side along the left-right direction (T) and are molded as one piece.
  • the first lenses 3 of the light emitting modules 1 are connected to each other, the substrates 41 of the light emitting modules 1 are connected integrally, and the light gratings 5 of the light emitting modules 1 are connected together.
  • the number of the light emitting modules 1 is not limited to the embodiment of the present disclosure. That is to say, there may be one or more light emitting modules 1 in other embodiments of the present disclosure.
  • the control circuit 2 is communicatively connected to the light emitting diodes 42 and is configured to change intensity of the light beam that is emitted by at least one of the light emitting diodes 42 according to the surrounding driving condition of the vehicle mounted with the adaptive headlight.
  • the control circuit 2 is capable of turning on and off the at least one of the light emitting diodes 42 and/or decreasing and increasing illuminance of the at least one of the light emitting diodes 42.
  • the vehicle mounted with the adaptive headlight is further mounted with a sensor (not shown) .
  • the sensor is configured to detect a position of a moving object in front of the adaptive headlight, such as an approaching vehicle or a vehicle in front, and a distance between the adaptive headlight and the moving object, and to transmit a detection signal indicating the position and the distance thus detected to the control circuit 2.
  • the control circuit 2 is capable of changing intensity of the light beam that is emitted by the at least one of the light emitting diodes 42 according to the detection signal thus received to prevent discomforting glare for drivers in oncoming or front vehicles.
  • the light beam emitted by the at least one of the light emitting diodes 42 corresponds to the moving object.
  • the moving object is located at an area illuminated by the light beam that is emitted by the at least one of the light emitting diodes 42.
  • the control circuit 2 may be implemented with a microprocessor, a micro control unit (MCU), or any circuit configurable/programmable in a software manner and/or hardware manner to perform functionalities of this disclosure. Note that since the main feature of the present disclosure does not reside in the control of the intensity of a light beam emitted by one of the light emitting diodes 42, further details of the same are omitted for the sake of brevity.
  • MCU micro control unit
  • the light beam emitted from the light emitting diode 42 propagates through the respective one of the light channels 52 that is aligned with the light emitting diode 42 along the front-rear direction (L), into the first light incident surface 31 of the first lens 3, and is refracted by the respective one of the lens portions 321 of the first lens 3 to form a virtual light source (F) of the light emitting diode 42 behind the light emitting diode 42.
  • the lens portions 321 are configured in such a manner that the virtual light sources (F) of the light emitting diodes 42 thus formed are arranged on the focal curve (C) of the second lens 6.
  • each of the virtual light sources (F) propagates through a respective one of the light channels 52, propagates outwardly of the first lens 3 via the first light output surface 32, and then propagates through the second lens 6 to be projected forwardly to illuminate a road area in front of the vehicle.
  • light beams emitted from a light source disposed at a focal point of a convex lens are refracted by the convex lens and then propagate outwardly of the convex lens as parallel light beams.
  • the light beams emitted from the light emitting diodes 42 form the virtual light sources (F) disposed on the focal curve (C), and then the light beams deemed to be emitted by the virtual light sources (F) propagate through the light grating 5 and through the first lens 3, and further propagate outwardly of the second lens 6 via the second light output surface (62) as parallel light beams.
  • the light beams respectively emitted from the light emitting diodes 42 of the adaptive headlight of the present disclosure are redirected as the parallel light beams to illuminate the road area in front of the adaptive headlight. There is thus provision of relatively concentrated light beams that meet the traffic regulations.
  • the light grating 5 serves as a collimator that causes the light beams emitted from the light emitting diodes 42 to be concentrated and to enter the respective lens portions 321 directly aligned in front of the respective light channels 52, and the structure of the elongated walls 51 blocks scattering light beams to thereby reduce light divergence.
  • the virtual light sources (F) may be accurately located on the focal curve (C), and the light beams projected forwardly through the second lens 6 is relatively concentrated and collimated.
  • a width of each of the light channels 52 along the left-right direction (T) ranges from 1 millimeter to 3 millimeters and a length of each of the light channels 52 in an upright direction (U) which is transverse to the left-right direction (T) and the front-rear direction (L) ranges from 3 millimeters to 10 millimeters. Note that the light beams passing through the light channels 52 are relatively few in number when the width and the length of each of the light channels 52 are too small, whereas light divergence may occur when the width and the length of each of the light channels 52 are too large.
  • the shape and dimension of the light channels 52 are specifically designed in this embodiment so a light pattern formed by the light beams emitted by the adaptive headlight may have specific dimensions and shape according to practical needs, but implementation of the light grating 5 is not limited to the examples described herein.
  • the grating 5 may be omitted, and the light beams emitted by the light emitting unit 4 directly propagate through the first lens 3 and are refracted by the first lens 3 to form the virtual light sources (F) on the focal curve (C).
  • the light beams emitted by the light emitting diodes 42 propagate through the light channels 52 and are respectively refracted by the lens portions 321 of the first lens 3 to form the virtual light sources (F) on the focal curve (C).
  • the light beams deemed to be emitted by the virtual light sources (F) further propagate through and are refracted respectively by the lens structures of the second lens 6 to project forwardly as parallel light beams so as to provide a relative good concentration and collimation for the adaptive headlight.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP19215476.3A 2019-12-12 2019-12-12 Adaptiver scheinwerfer für kfz Withdrawn EP3835649A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19215476.3A EP3835649A1 (de) 2019-12-12 2019-12-12 Adaptiver scheinwerfer für kfz

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19215476.3A EP3835649A1 (de) 2019-12-12 2019-12-12 Adaptiver scheinwerfer für kfz

Publications (1)

Publication Number Publication Date
EP3835649A1 true EP3835649A1 (de) 2021-06-16

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EP19215476.3A Withdrawn EP3835649A1 (de) 2019-12-12 2019-12-12 Adaptiver scheinwerfer für kfz

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023030808A1 (fr) * 2021-08-31 2023-03-09 Valeo Vision Module lumineux pour vehicule automobile
WO2023135171A1 (de) * 2022-01-11 2023-07-20 Marelli Automotive Lighting Reutlingen (Germany) GmbH Lichtmodul für einen kraftfahrzeugscheinwerfer und kraftfahrzeugscheinwerfer mit einem solchen lichtmodul
WO2024003133A1 (fr) * 2022-06-30 2024-01-04 Valeo Vision Module lumineux avec affichage par led optimisé pour application automobile

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008061556A1 (de) * 2008-12-11 2009-09-24 Daimler Ag Beleuchtungseinrichtung für ein Fahrzeug
EP2357399A1 (de) * 2010-02-16 2011-08-17 Koito Manufacturing Co., Ltd. Optische Einheit
DE102014117316A1 (de) * 2014-11-26 2016-06-02 Hella Kgaa Hueck & Co. Beleuchtungsvorrichtung für Fahrzeuge
US20170241607A1 (en) * 2016-02-22 2017-08-24 Valeo Vision Light beam projection device provided with a matrix of light sources, lighting and headlight module provided with such a device
EP3301348A1 (de) * 2016-09-29 2018-04-04 Valeo Vision Bandförmige beleuchtungsvorrichtung für kraftfahrzeugscheinwerfer
EP3467374A1 (de) * 2017-10-04 2019-04-10 ZKW Group GmbH Fahrzeugscheinwerfer
US20190203907A1 (en) * 2016-09-15 2019-07-04 Valeo Vision Luminous module comprising a monolithic electroluminescent source
US20190234572A1 (en) * 2018-01-29 2019-08-01 Valeo Vision Light module comprising a primary optical element equipped with two forming layers

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008061556A1 (de) * 2008-12-11 2009-09-24 Daimler Ag Beleuchtungseinrichtung für ein Fahrzeug
EP2357399A1 (de) * 2010-02-16 2011-08-17 Koito Manufacturing Co., Ltd. Optische Einheit
DE102014117316A1 (de) * 2014-11-26 2016-06-02 Hella Kgaa Hueck & Co. Beleuchtungsvorrichtung für Fahrzeuge
US20170241607A1 (en) * 2016-02-22 2017-08-24 Valeo Vision Light beam projection device provided with a matrix of light sources, lighting and headlight module provided with such a device
US20190203907A1 (en) * 2016-09-15 2019-07-04 Valeo Vision Luminous module comprising a monolithic electroluminescent source
EP3301348A1 (de) * 2016-09-29 2018-04-04 Valeo Vision Bandförmige beleuchtungsvorrichtung für kraftfahrzeugscheinwerfer
EP3467374A1 (de) * 2017-10-04 2019-04-10 ZKW Group GmbH Fahrzeugscheinwerfer
US20190234572A1 (en) * 2018-01-29 2019-08-01 Valeo Vision Light module comprising a primary optical element equipped with two forming layers

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023030808A1 (fr) * 2021-08-31 2023-03-09 Valeo Vision Module lumineux pour vehicule automobile
FR3127547A1 (fr) * 2021-08-31 2023-03-31 Valeo Vision Module lumineux à sources à partie émissive maximisée
WO2023135171A1 (de) * 2022-01-11 2023-07-20 Marelli Automotive Lighting Reutlingen (Germany) GmbH Lichtmodul für einen kraftfahrzeugscheinwerfer und kraftfahrzeugscheinwerfer mit einem solchen lichtmodul
WO2024003133A1 (fr) * 2022-06-30 2024-01-04 Valeo Vision Module lumineux avec affichage par led optimisé pour application automobile
FR3137438A1 (fr) * 2022-06-30 2024-01-05 Valeo Vision Module lumineux avec affichage par led optimisé pour application automobile

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