EP0558949A2 - Feu de croisement pour véhicules - Google Patents

Feu de croisement pour véhicules Download PDF

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Publication number
EP0558949A2
EP0558949A2 EP93101761A EP93101761A EP0558949A2 EP 0558949 A2 EP0558949 A2 EP 0558949A2 EP 93101761 A EP93101761 A EP 93101761A EP 93101761 A EP93101761 A EP 93101761A EP 0558949 A2 EP0558949 A2 EP 0558949A2
Authority
EP
European Patent Office
Prior art keywords
reflector
region
light
low beam
luminous element
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.)
Granted
Application number
EP93101761A
Other languages
German (de)
English (en)
Other versions
EP0558949A3 (fr
EP0558949B1 (fr
Inventor
Christian Dipl.-Ing. Lietar
Rainer Dr. Dipl.-Phys. Neumann
Henning Dr. Dipl.-Phys. Hogrefe
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 EP0558949A2 publication Critical patent/EP0558949A2/fr
Publication of EP0558949A3 publication Critical patent/EP0558949A3/xx
Application granted granted Critical
Publication of EP0558949B1 publication Critical patent/EP0558949B1/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
    • F21S41/30—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
    • F21S41/334—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors
    • F21S41/335—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors with continuity at the junction between adjacent areas

Definitions

  • the invention relates to a low beam headlight for motor vehicles according to the preamble of claim 1.
  • Such a low beam headlight is known from EP 0 250 284 A1.
  • This low beam headlamp has a reflector, a luminous element and a light plate covering the light exit opening of the reflector.
  • the luminous element is offset upward with respect to the optical axis of the reflector so that its lower limit lies approximately on the optical axis.
  • the reflector is divided into several sectors below and above a horizontal axial plane with different reflection surfaces. On one side of the reflector, a first sector extends from the horizontal axial plane up to an angle ⁇ to it, and on the other side of the reflector extends from the horizontal axial plane downwards at an angle ⁇ to it second sector, both sectors each having reflection surfaces in the form of paraboloid of revolution. These two sectors are connected by two adjoining sectors above and below the horizontal axial plane, which have reflection surfaces in the form of general paraboloids.
  • a general paraboloid contains parabolas in all axial longitudinal sections, but with different focal lengths.
  • This known dipped-beam headlight produces a light distribution with a light-dark boundary, which has a substantially horizontal section on the oncoming traffic side and a section that rises upwards with respect to the horizontal at the angle ⁇ to the road edge of one's own lane.
  • the lens only needs to have weakly effective optical means for shaping the light distribution.
  • a high luminous intensity is sought just below the light-dark boundary in order to obtain a long range and the sharpest possible formation of the light-dark limit. With the light distribution generated by the known reflector, however, this has not been achieved to the desired extent.
  • the low beam headlamp according to the invention with the characterizing features of claim 1 has the advantage that a high light intensity is present just below the light-dark boundary and thus a long range of light is achieved and the light-dark limit is clearly pronounced.
  • FIG. 1 shows a low beam headlight in vertical longitudinal section
  • FIG. 2 shows the reflector of the headlight in rear view
  • FIG. 3 shows the upper partial surface of the reflector in a cross section perpendicular to the optical axis
  • FIG. 4 shows images of a luminous element reflected by the upper left partial surface of the reflector
  • FIG. 6 the light distribution generated by the headlight.
  • a low-beam headlight for motor vehicles shown in FIG. 1 has a reflector 10, the light exit opening of which is covered by a lens 11, which can have optically effective elements. Furthermore, there is a luminous element 13, which can be the filament of an incandescent lamp or the arc of a gas discharge lamp. The luminous element extends approximately parallel to the optical axis 14 of the reflector 10, but is offset upwards with respect to this so that its lower limit lies approximately on the optical axis 14.
  • the reflector 10 is divided into an upper part 19 and a lower part 20 in a plane 17 shown in FIG. 2 and inclined at an angle ⁇ / 2 to the horizontal 16, both of which have reflection surfaces in the form of general paraboloids.
  • the two parts 19 and 20 continuously merge into one another in the contact plane 17, that is, that both parts have 17 common tangents in the plane of contact.
  • FIG. 3 shows a cross section through the upper part 19 of the reflector 10.
  • the upper part 19 has a reflective surface in the form of a general paraboloid.
  • the general paraboloid contains parabolas in all axial longitudinal sections, that is to say longitudinal sections containing the optical axis 14. However, the parabolas have different focal lengths and a common apex, so that there are different focal positions for the different parabolas.
  • the focal point Foh the parabola lying in the contact plane 17, lies approximately at the level of the center of the luminous element 13 on the optical axis 14.
  • the focal point Fov which lies in the axial plane 22 perpendicular to the contact plane 17, lies approximately at the level of the apex of the reflector facing end region of the luminous element 13 on the optical axis 14.
  • the focal point of the parabola resulting in the respective axial longitudinal section "migrates" from the center of the luminous element 13 to the end region of the luminous element 13 pointing towards the reflector apex.
  • an elliptical cutting curve 23 results in the cross section through the upper part 19 of the reflector 10.
  • the numerical eccentricity of the cutting curve 23 can be varied from the contact plane 17 to the vertical axial plane 22.
  • the eccentricity e of the intersection curve 23 in the region of the contact plane 17 is preferably almost zero, so that the normal intersects the intersection curve 23 and the optical axis 14 Intersection curve 23 is approximately a circle in this area.
  • the eccentricity e of the intersection curve 23 increases in relation to the vertical axial plane 22, that is to say with increasing angle ⁇ between a straight line OP connecting a reflector point P with the optical axis 14 and the contact plane 17.
  • FIG. 4 shows images of the luminous element 13 which are reflected by the upper part 19 of the reflector 10.
  • the illustrations 25 to 27 of the luminous element 13 are reflected by different areas of the reflector part 19, the normals of the intersection curve resulting in cross section, as described above, each have different distances from the optical axis 14. Due to the above-described formation of the intersection curve, the image 25 of the luminous body 13, which lies at the highest, borders with its upper edge directly on a horizontal section 28 of the light-dark boundary 30.
  • the further illustrations 26 and 27 lie below the light-dark boundary and are relative to the position of the respective reflector region Luminous body 13 inclined with respect to the horizontal.
  • the images 27 a to c are reflected by reflector regions, all of which lie on a common parabola, but are at different distances from the optical axis 14 and therefore reflect images of different sizes.
  • Figures 25 to 27 only come from areas seen in the direction of light emission left half of the upper reflector part 19 in order to maintain the clarity of FIG.
  • the lower part 20 of the reflector 10 also has a reflection surface in the form of a general paraboloid, the focal point Fuh, the parabola lying in the contact plane 17, as in the upper part 19 being approximately at the center of the luminous element 13 on the optical axis 14.
  • the focal point Fuv, the parabola lying in the vertical axial plane 22, lies at the level of the end region of the luminous body 13 pointing away from the reflector apex on the optical axis 14 "the focal point from the center of the luminous element 13 to its end region pointing away from the reflector apex.
  • the cross section perpendicular to the optical axis 14 results in an ellipse-like section curve, the eccentricity of which, starting from the contact plane 17, where this is approximately zero, reaches its maximum value in the vertical axial plane 22.
  • FIG. 5 shows images of the luminous element 13 which are reflected by the lower reflector part 20.
  • the illustrations 32 to 34 of the luminous element 13 are reflected by different areas of the reflector part 20, the normals of the intersection curve resulting in cross section, as described above, each have different distances from the optical axis 14. Due to the above-described design of the intersection curve, the image 32 of the luminous body 13 lying at the highest edge directly borders with its upper edge on a section 36 of the Corposcuro boundary 30 that rises by an angle ⁇ with respect to the horizontal are inclined in relation to the horizontal according to the position of the respective reflector region relative to the luminous element 13.
  • the figures 32 to 34 come only from areas of the left half of the reflector part 20, as seen in the light exit direction, in order to maintain the clarity of FIG. 5.
  • the upper and lower reflector parts 19 and 20 can be constructed from a plurality of sectors, which touch each other in an axial plane and are at least continuous in the first order there, that is to say they merge continuously.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Optical Elements Other Than Lenses (AREA)
EP93101761A 1992-03-05 1993-02-05 Feu de croisement pour véhicules Expired - Lifetime EP0558949B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4206881 1992-03-05
DE4206881A DE4206881A1 (de) 1992-03-05 1992-03-05 Abblendlichtscheinwerfer fuer kraftfahrzeuge

Publications (3)

Publication Number Publication Date
EP0558949A2 true EP0558949A2 (fr) 1993-09-08
EP0558949A3 EP0558949A3 (fr) 1994-03-02
EP0558949B1 EP0558949B1 (fr) 1997-01-08

Family

ID=6453249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93101761A Expired - Lifetime EP0558949B1 (fr) 1992-03-05 1993-02-05 Feu de croisement pour véhicules

Country Status (4)

Country Link
US (1) US5461549A (fr)
EP (1) EP0558949B1 (fr)
JP (1) JP3565875B2 (fr)
DE (2) DE4206881A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0709619A1 (fr) * 1994-10-27 1996-05-01 MAGNETI MARELLI U.K. Ltd. Projecteur pour véhicule avec un réflecteur comportant plusieurs secteurs
FR2740858A1 (fr) * 1995-11-08 1997-05-09 Valeo Vision Projecteur de vehicule automobile, comportant un miroir capable d'engendrer par lui-meme un faisceau a coupure en v

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10017659A1 (de) 2000-04-08 2001-10-11 Bosch Gmbh Robert Scheinwerfer für Fahrzeuge zur Erzeugung zumindest eines Abblendlichtbündels
CN1196009C (zh) 2000-05-31 2005-04-06 精工爱普生株式会社 投影机、图像显示系统、数据保存及显示方法
US9222637B2 (en) 2013-03-14 2015-12-29 Valeo North America, Inc. Lightguide with horizontal cutoff and horizontal spread
EP3057067B1 (fr) * 2015-02-16 2017-08-23 Thomson Licensing Dispositif et procédé pour estimer une partie brillante de rayonnement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4530042A (en) * 1982-11-19 1985-07-16 Cibie Projecteurs Dipped headlamp for automobiles
EP0250284A1 (fr) * 1986-05-26 1987-12-23 Valeo Vision Projecteur de croisement sans coupelle à concentration décalée
DE4010652A1 (de) * 1990-04-03 1991-10-10 Bosch Gmbh Robert Scheinwerfer fuer kraftfahrzeuge

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2599120B1 (fr) * 1986-05-26 1988-09-16 Cibie Projecteurs Projecteurs de croisement sans coupelle a concentration decalee
DE3731232A1 (de) * 1987-09-17 1989-03-30 Bosch Gmbh Robert Scheinwerfer fuer fahrzeuge, insbesondere scheinwerfer fuer kraftfahrzeuge
FR2639888B1 (fr) * 1988-12-07 1993-08-13 Valeo Vision Projecteur de vehicule automobile, comportant un reflecteur a surface complexe a zones intermediaires modifiees
JP2517485B2 (ja) * 1991-01-23 1996-07-24 株式会社小糸製作所 車輌用前照灯の反射鏡
DE4123658A1 (de) * 1991-07-17 1993-01-21 Bosch Gmbh Robert Scheinwerfer fuer kraftfahrzeuge

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4530042A (en) * 1982-11-19 1985-07-16 Cibie Projecteurs Dipped headlamp for automobiles
EP0250284A1 (fr) * 1986-05-26 1987-12-23 Valeo Vision Projecteur de croisement sans coupelle à concentration décalée
DE4010652A1 (de) * 1990-04-03 1991-10-10 Bosch Gmbh Robert Scheinwerfer fuer kraftfahrzeuge

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0709619A1 (fr) * 1994-10-27 1996-05-01 MAGNETI MARELLI U.K. Ltd. Projecteur pour véhicule avec un réflecteur comportant plusieurs secteurs
FR2740858A1 (fr) * 1995-11-08 1997-05-09 Valeo Vision Projecteur de vehicule automobile, comportant un miroir capable d'engendrer par lui-meme un faisceau a coupure en v
EP0773400A1 (fr) 1995-11-08 1997-05-14 Valeo Vision Projecteur de véhicule automobile, comportant un miroir capable d'engendrer par lui-même un faisceau à coupure en V
US5951156A (en) * 1995-11-08 1999-09-14 Valeo Vision Motor vehicle headlamp having a reflector capable of producing, by itself, a light beam with a V-shaped cut-off

Also Published As

Publication number Publication date
EP0558949A3 (fr) 1994-03-02
DE4206881A1 (de) 1993-09-09
DE59305013D1 (de) 1997-02-20
JP3565875B2 (ja) 2004-09-15
JPH0628905A (ja) 1994-02-04
EP0558949B1 (fr) 1997-01-08
US5461549A (en) 1995-10-24

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