EP0664419B1 - Headlamp for motor vehicles - Google Patents

Headlamp for motor vehicles Download PDF

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Publication number
EP0664419B1
EP0664419B1 EP95300154A EP95300154A EP0664419B1 EP 0664419 B1 EP0664419 B1 EP 0664419B1 EP 95300154 A EP95300154 A EP 95300154A EP 95300154 A EP95300154 A EP 95300154A EP 0664419 B1 EP0664419 B1 EP 0664419B1
Authority
EP
European Patent Office
Prior art keywords
reflector
zone
headlamp
spread elements
motor vehicles
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
EP95300154A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0664419A1 (en
Inventor
Milan Cejnek
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.)
Hanon Systems Autopal Services sro
Original Assignee
Autopal sro
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 Autopal sro filed Critical Autopal sro
Publication of EP0664419A1 publication Critical patent/EP0664419A1/en
Application granted granted Critical
Publication of EP0664419B1 publication Critical patent/EP0664419B1/en
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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/28—Cover glass

Definitions

  • the invention relates to a headlamp for motor vehicles having a dipped light beam of increased illumination intensity above the edge of the cut-off areas in the space where vertical traffic signs occur most frequently.
  • CH-A-366806 discloses a headlamp for motor vehicles comprising a reflector, a refractor and a light source placed in the reflector.
  • the refractor is provided with a zone of spread elements located below the upper edge of the reflector.
  • Headlamp models disclosed up to now have a relatively low illumination intensity above the edge of the cut-off areas for illuminating vertical traffic signs, particularly in the area 2 to 4 degrees above the horizontal line and 8 degrees to the left and to the right of the vertical line. A consequence of this is a relatively low brightness level of vertical traffic signs if they are illuminated by such headlamps. Consequently, both the probability that the driver will perceive the vertical traffic signals, and the speed of his perception are lower.
  • the refractory elements are vertical strip flutes and at least in part of the zone of the refracting elements, their profile is of wedge shape horizontally and the refracting angle basis is at the side of the central line of the road surface.
  • the vertical lenses then enlarge the light beam laterally so that the whole geometric area of the possible traffic signs occurrence is covered, whereby, the horizontal wedges direct the beam partially to the central line of the road surface, where the traffic signals are diverted by a greater angle away from the headlamp central line.
  • a minimal headlamp illumination intensity in the direction to the traffic signals of 0.1 to 0.2 Cd is created. This illumination intensity then ensures the necessary brightness level of their surface and thereby also the necessary speed and probability of signal perception in case of vertical traffic signals.
  • W (0.3 to 1.2) .
  • p is polar vector of the reflecting surface profile of the reflector 1 that extends from the focus F perpendicularly to the axis x of the reflector 1, whereby, for the parabolic or the elliptic profile of the reflecting surface of the reflector 1, p is a parameter of the parabola or the ellipse.
  • This distance value W determines the size and slope of the elementary representation of the light source 3, whereby the required vertical dimension of the zonal light beam is obtained.
  • the reflective surface of reflector 1 can be general or in the form of a paraboloid or ellipsoid of rotation with the axis of revolution x, where p is a parameter of the creating curve.
  • Figure 2 shows reflector 1, light source 3 and refractor 2 with a zone 21 of the spread elements 22 under the upper edge 11 of the reflector 1.
  • the light spread step at the transition of zones 21 and 23 of the spread elements 22, 24 is decreased by the difference in basis height of the refraction angles ⁇ 2V , ⁇ 3V and also the light beam that passes through the zones 23 of the spread elements 24 is directed down to the road surface. Thereby, the level of dazzling illumination in the space of the eye trajectory of the driver passing by in the opposite direction is decreased.
  • This profile of the spread elements 22 in the form of vertical strip flutes enlarges the side-zonal light beam that covers the area of probable occurrence of traffic signs.
  • This arrangement improves the visibility of vertical traffic signals even when riding through a bend.
  • the driver's optical vision is also improved.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Optical Elements Other Than Lenses (AREA)
EP95300154A 1994-01-19 1995-01-11 Headlamp for motor vehicles Expired - Lifetime EP0664419B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CZ11494A CZ279706B6 (cs) 1994-01-19 1994-01-19 Světlomet pro motorová vozidla
CZ11494 1994-01-19

Publications (2)

Publication Number Publication Date
EP0664419A1 EP0664419A1 (en) 1995-07-26
EP0664419B1 true EP0664419B1 (en) 1998-07-08

Family

ID=5461236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95300154A Expired - Lifetime EP0664419B1 (en) 1994-01-19 1995-01-11 Headlamp for motor vehicles

Country Status (4)

Country Link
EP (1) EP0664419B1 (cs)
CZ (1) CZ279706B6 (cs)
DE (1) DE69503262T2 (cs)
ES (1) ES2118501T3 (cs)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19627936B4 (de) * 1996-07-11 2008-01-31 Automotive Lighting Reutlingen Gmbh Fahrzeugscheinwerfereinheit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1150636B (de) * 1957-02-13 1963-06-27 Westfaelische Metall Ind K G Scheinwerferscheibe fuer asymmetrische Lichtverteilung
DE3430272C2 (de) * 1984-08-17 1993-10-14 Bosch Gmbh Robert Nebelscheinwerfer mit einer mit optischen Mitteln versehenen Abdeckscheibe für Kraftfahrzeuge
CZ282189B6 (cs) * 1993-01-25 1997-05-14 Autopal, S.R.O. Světlomet pro motorová vozidla

Also Published As

Publication number Publication date
CZ11494A3 (en) 1995-06-14
CZ279706B6 (cs) 1995-06-14
EP0664419A1 (en) 1995-07-26
DE69503262T2 (de) 1998-11-05
DE69503262D1 (de) 1998-08-13
ES2118501T3 (es) 1998-09-16

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