EP2028414B1 - Phare de véhicule - Google Patents

Phare de véhicule Download PDF

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Publication number
EP2028414B1
EP2028414B1 EP08162775.4A EP08162775A EP2028414B1 EP 2028414 B1 EP2028414 B1 EP 2028414B1 EP 08162775 A EP08162775 A EP 08162775A EP 2028414 B1 EP2028414 B1 EP 2028414B1
Authority
EP
European Patent Office
Prior art keywords
light emitting
light
shade
vehicle headlamp
emitting diode
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.)
Ceased
Application number
EP08162775.4A
Other languages
German (de)
English (en)
Other versions
EP2028414A1 (fr
Inventor
Motohiro c/o KOITO MANUFACTURING CO. LTD Komatsu
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.)
Koito Manufacturing Co Ltd
Original Assignee
Koito Manufacturing 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 Koito Manufacturing Co Ltd filed Critical Koito Manufacturing Co Ltd
Publication of EP2028414A1 publication Critical patent/EP2028414A1/fr
Application granted granted Critical
Publication of EP2028414B1 publication Critical patent/EP2028414B1/fr
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F21S41/68—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens
    • F21S41/683—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens by moving screens
    • F21S41/686—Blades, i.e. screens moving in a vertical plane
    • 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]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • Apparatuses and devices consistent with the present invention relate to a vehicle headlamp. More specifically, the apparatuses and devices consistent with the present invention relate to a vehicle headlamp capable of selecting a light distribution pattern.
  • a lamp unit comprising a projection lens and a light emitting diode as a light source is disposed in a lamp chamber formed by a lens cover and a lamp body (see e.g., JP-A-2005-44683 ).
  • a shade is disposed in front of the light source with a gap therebetween so as to shield a part of the light emitted from the light source.
  • a position or a slope of a shade for shielding a part of light is changed so as to select a long-distance light distribution pattern that irradiates a long-distance area or a short-distance light distribution pattern that irradiates a short-distance area in accordance with the position or the slope of the shade.
  • Exemplary embodiments of the present invention address the above disadvantages and other disadvantages not described above.
  • the present invention is not required to overcome the disadvantages described above, and thus, an exemplary embodiment of the present invention may not overcome any of the problems described above.
  • a vehicle headlamp includes at least one light source module comprising a substrate and a light emitting diode mounted on the substrate; a shade for shielding a part of light emitted from a light emitting surface of the light emitting diode; a projection lens through which the light passes, wherein a focal point of the projection lens is located on or near the light emitting surface; and a shade driving unit configured to move the shade to a light shielding position in which the part of the light emitted from the light emitting surface is shielded, and to an open position in which the light emitted from the light emitting surface is unshielded.
  • a vehicle headlamp which includes a substrate; a light emitting diode comprising a light emitting surface, the light emitting diode being mounted on the substrate; a shade which is movable between a first position in which a portion of the shade is positioned adjacent to the light emitting surface and a part of the light emitted from the light emitting surface of the light emitting diode is blocked by the shade, and a second position in which the light emitted from the light emitting surface is unblocked; and a shade controller, which is configured to move the shade between the first position and the second position.
  • a vehicle headlamp 1 is attached to both left and right end portions in a front end portion of a vehicle body.
  • a vehicle headlamp 1 is provided for each of the left and right end portions of the vehicle body.
  • the vehicle headlamp 1 includes a lamp body 2 having a concave portion opened forward and a cover 3 closing an opening surface of the lamp body 2, and the lamp body 2 and the cover 3 form an inner space as a lamp chamber 4.
  • a first lamp unit 5 is disposed in the lamp chamber 4.
  • the first lamp unit 5 is configured by attaching, for example, four lamp units, which will be described later, to a bracket 6.
  • the bracket 6 is provided with a first attachment portion 6a, a second attachment portion 6b, and a third attachment portion 6c in a sequential order from the top to the bottom of lamp body 2.
  • the bracket 6 is provided with a first supported portion 6d protruding forward from the rear end portion of the first attachment portion 6a and a second supported portion 6e protruding backward from the rear end portion of the third attachment portion 6c.
  • the bracket 6 is supported to the lamp body 2 by an aiming adjustment mechanism 7 and a leveling adjustment mechanism 8 so as to be tiltable.
  • the aiming adjustment mechanism 7 includes, for example, one pivot support point 7a located at a lower side and two adjusting screws 7b located at an upper side.
  • the pivot support point 7a is connected to the second supported portion 6e of the bracket 6, and the adjusting screws 7b are respectively connected to the first supported portion 6d of the bracket 6 via the lamp body 2.
  • the bracket 6 In the aiming adjustment mechanism 7, when the adjusting screws 7b are rotated, the bracket 6 is tilted in a certain direction about the pivot support point 7a. In accordance with the tilting action of the bracket 6, the four lamp units are tilted so as to perform a light axis adjustment (aiming adjustment) of the head light.
  • the leveling adjustment mechanism 8 includes, for example, one pivot support point 8a located at a lower side and two adjusting screws 8b located at an upper side.
  • the pivot support point 8a serves as the pivot support point 7a of the aiming adjustment mechanism 7, and the adjusting screws 8b serve as the adjusting screws 7b of the aiming adjustment mechanism 7.
  • the pivot support point 8a is capable of moving in a longitudinal direction and is used as a driving shaft of a leveling actuator 9 fixed to an inner surface of the lamp body 2.
  • the bracket 6 is tilted in a certain direction with respect to the lamp body 2 with the adjusting screws 8b, 8b as the support points.
  • the four lamp units are tilted so as to perform a light axis adjustment (leveling adjustment) of the head light.
  • the bracket 6 is attached with four lamp units, that is, first lamp units 10, 10, a second lamp unit 11, and a third lamp unit 12.
  • Each of the first lamp units 10 is attached to the first attachment portion 6a and includes a first light emitting diode 13, a reflector 14, a light shielding member 15, and a projection lens 16.
  • the first light emitting diode 13 is disposed on a substrate 17, and a first light source module is configured by disposing the first light emitting diode 13 on the substrate 17.
  • the first light emitting diode 13 is disposed such that a light emitting surface 13a faces upward.
  • Radiating fins 18, 18 are provided on the rear surface side of the first attachment portion 6a, and heat generated when emitting light from the first light emitting diodes 13, 13 is radiated by the radiating fins 18, 18.
  • the first lamp units 10, 10 In the first lamp units 10, 10, light emitted from the first light emitting diodes 13, 13 is reflected by the reflectors 14, 14. Subsequently, a part of light is shielded by the light shielding members 15, 15. The light is collected by the projector lenses 16 and then is irradiated forward via the cover 3. A so-called low beam for irradiating a short-distance area is emitted from the first light emitting diodes 10.
  • the second lamp unit 11 is attached to the second attachment portion 6b, and includes a second light emitting diode 19, a shade 20, and a projection lens 21.
  • the second light emitting diode 19 is configured by, for example, two light emitting portions 22, which are disposed at left and right sides ( see Fig. 3 ).
  • the second light emitting diode 19 is disposed on a substrate 23, and a second light source module is configured by disposing the second light emitting diode 19 on the substrate 23.
  • the light emitting portions 22 are disposed such that light emitting surfaces 22a face forward.
  • a radiating fin 24 is provided on the rear surface side of the second attachment portion 6a, and heat generated when emitting light from the second light emitting diode 19 is radiated by the radiating fin 24.
  • the shade 20 is formed into a plate shape and faces in a longitudinal direction so that the upper end portion serves as a light shielding portion 25 ( see Figs. 1 and 3 ).
  • the light shielding portion 25 is formed into a film shape and has a slope surface 26 inclined downward in a forward direction, in which the rear edge of the slope surface 26 is located at the topmost portion to thereby form a top portion 27.
  • the slope surface 26 includes an intermediate portion 26a located at the center in a horizontal direction, a first side portion 26b and a second side portion 26c with the intermediate portion 26a interposed therebetween.
  • the intermediate portion 26a is inclined in a horizontal direction.
  • the first side portion 26b and the second side portion 26c are elongate in a horizontal direction.
  • the slope surface 26 may be subjected to, for example, a reflection process such as an aluminum deposition.
  • a shade driving unit 28 is disposed below the second attachment portion 6a of the bracket 6.
  • the shade driving unit 28 is configured by, for example, a driving motor, a flange, and the like.
  • the shade 20 is moved, for example, in a vertical direction by the shade driving unit 28.
  • the shade 20 moves between a light shielding position (see Fig. 3 ) corresponding to an upper movement end and an open position corresponding to a lower movement end.
  • the light shielding portion 25 is located at a position adjacent to the front side of the second light emitting diode 19 ( see Figs. 1 and 3 ), and the top portion 27 of the light shielding portion 25 is located above the lower ends of the light emitting surfaces 22a.
  • the shade 20 is in the light shielding position, a part of light emitted from the second light emitting diode 19 is shielded, and a so-called low beam for irradiating a short-distance area is emitted from the second light emitting diode 19.
  • a focal point of the projection lens 21 is located on the light emitting surfaces 22a of the second light emitting diode 19, near the light emitting surfaces 22a, or at the top portion 27 of the slope surface 26 when the shade 20 is located at the light shielding position.
  • the third lamp unit 12 is attached to the third attachment portion 6c, and includes third light emitting diodes 29 and a reflector 30.
  • Each of the third light emitting diodes 29 is disposed on a substrate 31, and a third light source module is configured by disposing the third light emitting diodes 29 on the substrate 31.
  • the third light emitting diodes 29 are disposed such that the light emitting surfaces 29a face downward.
  • Radiating fins 32, 32 are provided on the rear surface side of the reflector 30, and heat generated when emitting light from the third light emitting diodes 29 is radiated by the radiating fins 32, 32.
  • the third lamp unit 12 In the third lamp unit 12, light emitted from the third light emitting diodes 29, 29 is reflected by the reflector 30 and is irradiated forward via the cover 3. A so-called low beam for irradiating a short-distance area is emitted from the third light emitting diodes 29, 29.
  • a second lamp unit 33 is disposed to the side of the first lamp unit 5 ( see Fig. 2 ).
  • the second lamp unit 33 includes a light source 34 and a reflector 35 for reflecting light emitted from the light source 34 forward.
  • the second lamp unit 33 may also be manipulated to perform the aiming adjustment or the leveling adjustment by use of an aiming adjustment mechanism 36 and a leveling adjustment 37 which operate similarly to the aiming adjustment mechanism 7 and the leveling adjustment mechanism 8 described above.
  • the aiming adjustment mechanism 36 includes one pivot support point 36a and two adjusting screws 36b.
  • the pivot support point 36a is located at a lower side.
  • the two adjusting screws 36b are located at an upper side and a lower side, respectively.
  • the aiming adjustment mechanism 36 when the adjusting screws 36b are rotated in a desired direction, the second lamp unit 33 is tilted with respect to the lamp body 2 in a certain direction with the pivot support point 36a as supporting point, thereby performing the aiming adjustment.
  • the leveling adjustment mechanism 37 includes, for example, one pivot support point 37a located at a lower side and two adjusting screws 37b located at an upper side and a lower side, respectively.
  • the pivot support point 37a serves as the pivot support point 36a of the aiming adjustment mechanism 36
  • the adjusting screws 37b serve as the adjusting screws 36b of the aiming adjustment mechanism 36.
  • the second lamp unit 33 is tilted with respect to the lamp body 2 in a certain direction with the adjusting screws 37b as support points, thereby performing the leveling adjustment.
  • the second lamp unit 33 In the second lamp unit 33, light emitted from the light source 34 is reflected by the reflector 35 and then is irradiated forward via the cover 3. A so-called high beam for irradiating a long-distance area is emitted from the light source 34.
  • the shade 20 of the second lamp unit 11 is moved to the light shielding position, and a part of light emitted from the second light emitting diode 19 is shielded by the shade 20.
  • Fig. 4 is a view showing a light distribution pattern when irradiating the low beam.
  • 'H' indicates a horizontal cut line
  • 'P1' indicates a pattern formed by light emitted from the first light emitting diodes 13
  • 'P2' indicates a pattern formed by light emitted from the second light emitting diode 19
  • 'P3' indicates a pattern formed by light emitted from the third light emitting diodes 29.
  • Fig. 5 is a view showing a light distribution pattern when irradiating the high beam.
  • 'H' indicates a horizontal cut line
  • 'P2' indicates a pattern formed by light emitted from the second light emitting diode 19
  • 'Pw' indicates a pattern formed by light emitted from the light source 34.
  • the number of the light emitting portions 22 of the second light emitting diode 19 is not limited to two.
  • the number of the light emitting portions 22 may alternatively be one or three or more. In other words, the number of the light emitting portions may be arbitrarily determined. For example, as shown in Fig. 6 , the number of light emitting portions 22 may be four.
  • an elongate light distribution pattern in a horizontal direction may be formed, as shown in Fig. 7 .
  • 'P1' indicates a pattern at the low beam emitted from the second light emitting diode 19
  • 'Ph' indicates a pattern at the high beam emitted from the second light emitting diode 19.
  • the two left light emitting portions 22 may be controlled together and the two right light emitting portions 22 may be controlled together.
  • the high beam when the high beam is irradiated, by turning on the two left light emitting portions 22 and turning off the two right light emitting portions 22, it is possible to ensure satisfactory visibility with respect to a traffic lane and to prevent glare light with respect to an oncoming vehicle.
  • a shade 20A is formed in a flat-pate shape, in which a slope surface is not formed in a light shielding portion 25A.
  • the shade 20A moves in a vertical direction so as to select the low beam or the high beam.
  • a shade 20B is formed into a flat-plate shape, in which a slope surface is not formed in a light shielding portion 25B.
  • An upper surface of the light shielding portion 258 is configured as a reflection surface 25a through an aluminum deposition.
  • the shade 20B moves in a vertical direction so as to select the low beam or the high beam.
  • the light shielding portion into a wedge shape ( see Fig. 3 ), it is possible to ensure a high light intensity and a high light flux, and thus to efficiently use the emitted light.
  • a movement direction of the shades 20, 20A or 20B is not limited to a vertical direction.
  • the shade 20 (or 20A or 20B) may be rotated into the light shading position.
  • the shade driving unit 28A is disposed in a direction such that a rotation driving shaft 28a extends in a longitudinal direction. Accordingly, it is possible to select the low beam or the high beam by rotating the shade 20 (20A or 20B).
  • the shade 20 may be rotated along an axis which runs parallel to a plane of the substrate 23, as shown in Fig. 11 .
  • the shade driving unit 28B is disposed in a direction such that a rotation driving shaft 28b extends in a horizontal direction (i.e., parallel to a plane of the substrate 23). Accordingly, it is possible to select the low beam or the high beam by rotating the shade 20 (20A or 20B) from a position in which the shade 20 (or 20A or 20B) is orthogonal to the plane of the substrate 23 to a position in which the shade 20 (or 20A or 20B) is parallel to the plane of the substrate 23.
  • stopper walls 29 may be disposed on the left and right sides of the second light emitting diode 19, and the shade 20 (or 20A or 20B) is rotated into the light shielding position such that the shade 20 (or 20A or 20B) makes contact with the stopper walls 29, 29, thus allowing for more precision.
  • a focal point of the projection lens 21 is located on or near the light emitting surface 22a of the second light emitting diode 19.
  • the shade 20 (or 20A or 20B) is caused to move between the light shielding position and the open position, and the shade 20 (or 20A or 20B) is caused to be located near the second light emitting diode 19 at the light shielding position. Accordingly, it is possible to provide a size-reduced vehicle headlamp 1 capable of selecting a light distribution pattern, and forming a light distribution pattern having a clear cut line.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (6)

  1. Phare de véhicule (1) comprenant :
    au moins un module source de lumière (11) comprenant un substrat (23) et une diode électroluminescente (19) montée sur le substrat ;
    un élément formant écran (20) pour bloquer une partie de la lumière émise par une surface émettrice de lumière (22a) de la diode électroluminescente (19) ;
    une lentille de projection (21) traversée par la lumière ; et
    une unité d'entraînement d'élément formant écran (28, 28B) configurée pour déplacer l'élément formant écran (20) vers une position de blocage de la lumière dans laquelle la partie de la lumière émise par la surface émettrice de lumière (22a) est bloquée et vers une position ouverte dans laquelle la lumière émise par la surface émettrice de lumière n'est pas bloquée ;
    dans lequel l'élément formant écran (20) est disposé de manière adjacente à la surface émettrice de lumière (22a) dans la position de blocage de la lumière et le foyer de la lentille de projection est situé sur la surface émettrice de lumière (22a) lorsque l'élément formant écran (20) est dans la position ouverte, et caractérisé en ce que le foyer de la lentille de projection est situé au niveau de la portion supérieure (27) d'une surface inclinée (27) lorsque l'élément formant écran (20) est dans la position de blocage de la lumière.
  2. Phare de véhicule selon la revendication 1, dans lequel l'élément formant écran (20) est conformé sensiblement en forme de plaque.
  3. Phare de véhicule selon la revendication 1 ou 2, dans lequel l'élément formant écran (20) comprend une portion de blocage de lumière (25), qui est conformée en forme de coin et qui bloque la partie de la lumière, et
    dans lequel le foyer est situé au niveau de la portion d'extrémité supérieure de la portion de blocage de lumière (25) dans la position de blocage de la lumière.
  4. Phare de véhicule selon l'une quelconque des revendications 1 à 3, dans lequel l'élément formant écran (20) comprend une portion de blocage de lumière (25) qui bloque la partie de la lumière, et
    la portion de blocage de lumière comprend une surface de réflexion (26).
  5. Phare de véhicule selon l'une quelconque des revendications 1 à 4, dans lequel la diode électroluminescente (19) comprend une pluralité de portions émettrices de lumière (22),
    dans lequel les portions de la pluralité de portions émettrices de lumière (22) sont agencées de sorte que les surfaces émettrices de lumière des portions émettrices de lumière sont tournées dans une même direction, et
    dans lequel les portions de la pluralité de portions émettrices de lumière sont commandées indépendamment de façon à être allumées ou éteintes.
  6. Phare de véhicule selon l'une quelconque des revendications 1 à 5, dans lequel l'élément formant écran (20) est rotatif et l'unité d'entraînement d'élément formant écran (28B) fait tourner l'élément formant écran dans la position de blocage de la lumière.
EP08162775.4A 2007-08-22 2008-08-21 Phare de véhicule Ceased EP2028414B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007216319A JP5226985B2 (ja) 2007-08-22 2007-08-22 車輌用前照灯

Publications (2)

Publication Number Publication Date
EP2028414A1 EP2028414A1 (fr) 2009-02-25
EP2028414B1 true EP2028414B1 (fr) 2015-01-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08162775.4A Ceased EP2028414B1 (fr) 2007-08-22 2008-08-21 Phare de véhicule

Country Status (2)

Country Link
EP (1) EP2028414B1 (fr)
JP (1) JP5226985B2 (fr)

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KR101610535B1 (ko) * 2014-11-04 2016-04-20 현대자동차주식회사 적응형 전조등 시스템의 빔 패턴 조절 장치
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JP5226985B2 (ja) 2013-07-03
JP2009048948A (ja) 2009-03-05

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