EP1033527A2 - A combined headlight for motor vehicles - Google Patents

A combined headlight for motor vehicles Download PDF

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Publication number
EP1033527A2
EP1033527A2 EP00301700A EP00301700A EP1033527A2 EP 1033527 A2 EP1033527 A2 EP 1033527A2 EP 00301700 A EP00301700 A EP 00301700A EP 00301700 A EP00301700 A EP 00301700A EP 1033527 A2 EP1033527 A2 EP 1033527A2
Authority
EP
European Patent Office
Prior art keywords
headlight
light beam
objective
boundary part
combined
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Withdrawn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
EP00301700A
Other languages
German (de)
French (fr)
Other versions
EP1033527A3 (en
Inventor
Jaroslav Purma
David Vozenilek
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 EP1033527A2 publication Critical patent/EP1033527A2/en
Publication of EP1033527A3 publication Critical patent/EP1033527A3/en
Withdrawn legal-status Critical Current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
    • F21S41/30—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
    • F21S41/336—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors with discontinuity at the junction between adjacent areas
    • 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
    • F21S41/331—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas
    • F21S41/333—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas with discontinuity at the junction between adjacent areas

Definitions

  • the present invention relates to a combined headlight for motor vehicles with enhanced lighting effectiveness of the optical system.
  • headlights of projection design were developed.
  • Such a headlight is comprised of a reflector of elliptic type, a shield limiting the light beam and a simple objective that depicts brightness contrast of the shield dark area and the illuminated shield background.
  • the lighting efficiency of the system is defined by the angle of view of the ellipsoid reflector, the angle of view of the objective and the light quantity shaded by the shield.
  • the photometric performance of headlights has a significant influence on optimisation of the light beam shapes in front of a vehicle and thereby also on traffic safety.
  • An increase in the lighting efficiency by a decrease in the quantity of light shaded by a shield is disclosed in CZ 275 670.
  • the separated light beams are produced by combining two types of optical lighting systems, a projecting system and a simple mirror surface, whereby, both systems have a common light source.
  • the projection system forms the central part of a headlight in a view into the headlight.
  • the mirror system forms the boundary part of the headlight.
  • the mirror boundary part of a headlight utilises the light of a source that can not be efficiently used by the objective in the central part of a headlight.
  • the projection central part of a headlight produces a scattered light beam, the mirror boundary part produces the straight concentric light beam around a maximum.
  • this configuration makes possible to design a very compact headlight suitable both for dry and wet roads.
  • wet roads it is desirable to decrease the headlight luminous intensity in the area of small scattering ( ⁇ 7°).
  • a decrease in the luminous intensity of a headlight in this area can be obtained by shading of the mirror boundary part of a headlight that produces the straight concentric light beam.
  • the configuration of a headlight described above also decreases psychological dazzling of the opposite direction drivers (or dazzling coming from a rear view mirror) as a consequence of an enlarged shining area of a headlight.
  • another advantage of this configuration is that the mirror boundary parts of a headlight function as a reflecting light of a parked vehicle when visibility is decreased. This makes a parked vehicle more visible.
  • Figure 1 shows a horizontal cross-sectional illustration of a headlight.
  • Figure 2 shows a front view of a headlight.
  • Figure 3 shows a schematic illustration of a testing wall illuminated by a projector central and mirror boundary part of a headlight.
  • Figure 4 shows a schematic view of a headlight and an illuminated testing wall.
  • Figure 1 shows a combined headlight comprising a light source 1 , reflective central ellipsoid segments that form a headlight central part 2 , reflective boundary mirror segments that form a headlight boundary part 5 , concave shields 3 and an aspherical objective 4 .
  • Said reflector is comprised of two parts of different geometry and function.
  • Said central part 2 is geometrically more like an ellipsoid and said boundary part 5 is geometrically more like a paraboloid.
  • Figure 3 shows a schematic illustration of individual light beams of the central 2 and the boundary 5 parts of a headlight.
  • the area 100 represents the scattered light beam on a measuring wall coming from the headlight central part 2 .
  • the area 200 represents the straight concentric light beam coming from said reflector boundary part 5 .
  • a halogen bulb with a longitudinal or a transversal filament is used as a light source 1 .
  • Said shield 3 is concave in the direction to said objective 4 .
  • the cutting edges of said shield 3 are situated in the space of the body area of said objective 4 . Bending of said shield 3 increases lighting efficiency of the segments of said reflector boundary part 5 .
  • Said objective 4 is a plano-convex aspherical lens.
  • Reflected light of said reflector central part 2 passes above said shield 3 into said objective 4 and illuminates a measuring wall by a scattered light beam 100.
  • the general shape of said beam 100 having horizontal dimension d c (measured at the isocurve 400 cd) and a 15 degrees slope 300 is formed by said reflector ellipsoidal central part 2 which is more open in the horizontal cross-sections parallel to the plane H C -H C than the ellipsoid with focuses F 1 -F 2 and more closed than the ellipsoid with focuses F 1 -F 3 (F 1 -F 3 ') .
  • the final rather sharp interface between light and darkness at the horizon in the beam 100 is obtained by the shape of the shield 3 .
  • Light emitted by said light source 1 and reflected from said reflector boundary part 5 passes mainly along said objective 4 , whereby it illuminates a measuring wall by a straight concentric light beam 200 .
  • the straight concentric light beam 200 having horizontal dimension d P (measured on isocurve 700 cd) is produced by said reflector boundary part 5 because the boundary part 5 is formed by paraboloids with focuses f T and f B .
  • the paraboloid focus f T of said reflector boundary part 5 above the horizontal cross-section H C - H C is on the nearer end of said light source 1 with regard to the top of said reflector central part 2 .
  • the paraboloid focus f B of said reflector boundary part 5 bellow the horizontal cross-section H C - H C is at the more distant end of said light source 1 with regard to the top of said reflector central part 2 .
  • the reflector boundary part 5 can also be a free mirror surface that is geometrically nearly like a paraboloid with focus F 1 and by its functional shape it produces an image of the light source 1 below the horizontal line H-H.
  • the horizontal dimension d c of the beam 100 is minimally three times greater than the horizontal dimension d p of the beam 200, whereby d c is minimally 45°.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

A combined headlight for motor vehicles comprised of a projection design headlight part and a simple mirror design part, whereby, its projection part comprises a light source (1), a central part (2) formed by reflective central ellipsoidal segments, a concave shield (3) and an aspherical objective (4). Its mirror part comprises a light source (1) and a boundary part (5) formed by reflective boundary mirror segments. The projection part produces a scattered light beam (100), the mirror part produces a straight concentrated light beam (200) around a maximum.

Description

    Field of the Invention
  • The present invention relates to a combined headlight for motor vehicles with enhanced lighting effectiveness of the optical system.
    • Background of the Invention
  • The height limitation of headlights caused that headlights of projection design were developed. Such a headlight is comprised of a reflector of elliptic type, a shield limiting the light beam and a simple objective that depicts brightness contrast of the shield dark area and the illuminated shield background. The lighting efficiency of the system is defined by the angle of view of the ellipsoid reflector, the angle of view of the objective and the light quantity shaded by the shield. The photometric performance of headlights has a significant influence on optimisation of the light beam shapes in front of a vehicle and thereby also on traffic safety. An increase in the lighting efficiency by a decrease in the quantity of light shaded by a shield is disclosed in CZ 275 670.
    • Summary of the Invention
  • It is an objective of the present invention to enhance the photometric performance of a headlight by combining two specific types of light beams, a scattered light beam and a straight concentrated light beam. The separated light beams are produced by combining two types of optical lighting systems, a projecting system and a simple mirror surface, whereby, both systems have a common light source. The projection system forms the central part of a headlight in a view into the headlight. The mirror system forms the boundary part of the headlight. The mirror boundary part of a headlight utilises the light of a source that can not be efficiently used by the objective in the central part of a headlight. The projection central part of a headlight produces a scattered light beam, the mirror boundary part produces the straight concentric light beam around a maximum.
  • In comparison to the prior art designs, it is an advantage of this design that the functions for the scattered and the straight light beams are separated and that the headlight emitting surface is enlarged. Eventually, this configuration makes possible to design a very compact headlight suitable both for dry and wet roads. In case of the wet roads it is desirable to decrease the headlight luminous intensity in the area of small scattering (± 7°). A decrease in the luminous intensity of a headlight in this area can be obtained by shading of the mirror boundary part of a headlight that produces the straight concentric light beam. The configuration of a headlight described above also decreases psychological dazzling of the opposite direction drivers (or dazzling coming from a rear view mirror) as a consequence of an enlarged shining area of a headlight. In comparison to a prior art projector, another advantage of this configuration is that the mirror boundary parts of a headlight function as a reflecting light of a parked vehicle when visibility is decreased. This makes a parked vehicle more visible.
    • Brief Description of the Drawings
  • Figure 1 shows a horizontal cross-sectional illustration of a headlight. Figure 2 shows a front view of a headlight.
  • Figure 3 shows a schematic illustration of a testing wall illuminated by a projector central and mirror boundary part of a headlight. Figure 4 shows a schematic view of a headlight and an illuminated testing wall.
    • Detailed Description of the Invention
  • Figure 1 shows a combined headlight comprising a light source 1, reflective central ellipsoid segments that form a headlight central part 2, reflective boundary mirror segments that form a headlight boundary part 5, concave shields 3 and an aspherical objective 4. Said reflector is comprised of two parts of different geometry and function. Said central part 2 is geometrically more like an ellipsoid and said boundary part 5 is geometrically more like a paraboloid. Figure 3 shows a schematic illustration of individual light beams of the central 2 and the boundary 5 parts of a headlight. The area 100 represents the scattered light beam on a measuring wall coming from the headlight central part 2. The area 200 represents the straight concentric light beam coming from said reflector boundary part 5. As a light source 1 a halogen bulb with a longitudinal or a transversal filament is used. Said shield 3 is concave in the direction to said objective 4. The cutting edges of said shield 3 are situated in the space of the body area of said objective 4. Bending of said shield 3 increases lighting efficiency of the segments of said reflector boundary part 5. Said objective 4 is a plano-convex aspherical lens.
  • Reflected light of said reflector central part 2 passes above said shield 3 into said objective 4 and illuminates a measuring wall by a scattered light beam 100. The general shape of said beam 100 having horizontal dimension dc (measured at the isocurve 400 cd) and a 15 degrees slope 300 is formed by said reflector ellipsoidal central part 2 which is more open in the horizontal cross-sections parallel to the plane HC-HC than the ellipsoid with focuses F1-F2 and more closed than the ellipsoid with focuses F1-F3(F1-F3'). The final rather sharp interface between light and darkness at the horizon in the beam 100 is obtained by the shape of the shield 3.
  • Light emitted by said light source 1 and reflected from said reflector boundary part 5 passes mainly along said objective 4, whereby it illuminates a measuring wall by a straight concentric light beam 200. The straight concentric light beam 200 having horizontal dimension dP (measured on isocurve 700 cd) is produced by said reflector boundary part 5 because the boundary part 5 is formed by paraboloids with focuses fT and fB . The paraboloid focus fT of said reflector boundary part 5 above the horizontal cross-section HC - HC is on the nearer end of said light source 1 with regard to the top of said reflector central part 2. The paraboloid focus fB of said reflector boundary part 5 bellow the horizontal cross-section HC - HC is at the more distant end of said light source 1 with regard to the top of said reflector central part 2. The reflector boundary part 5 can also be a free mirror surface that is geometrically nearly like a paraboloid with focus F1 and by its functional shape it produces an image of the light source 1 below the horizontal line H-H.
  • The horizontal dimension dc of the beam 100 is minimally three times greater than the horizontal dimension dp of the beam 200, whereby dc is minimally 45°.

Claims (10)

  1. A combined headlight for motor vehicles comprised of a projection and a mirror lighting systems, characterised in that both systems have a common light source (1), whereby,
    light reflected by a reflector central part (2) that passes above a shield (3) into an objective (4) produces a scattered light beam (100) with a 15 degrees slope (300) of a dimmed headlight and
    light reflected by a reflector boundary part (5) passing mainly around said objective (4) produces a straight concentrated light beam (200).
  2. A combined headlight of claim 1, characterised in that ratio of the horizontal dimension dc of said scattered light beam (100) and the horizontal dimension d p of said concentrated light beam (200) is maximally dp /dc ≤ 1/3.
  3. A combined headlight of claim 1 or 2, characterised in that said reflector boundary part (5) produces a concentrated light beam (200) which is asymmetric with regard to plain V-V with a maximum on the side of said light 15 degrees slope (300) of said scattered light beam (100).
  4. A combined headlight of claim 1, 2 or 3, characterised in that said reflector boundary part (5) are paraboloids with focuses on the radiating ends of said light source (1), whereby, focus fT of said paraboloid (5) above the horizontal axis cross-section HC - HC is shorter than the focus fB of said paraboloid (5) below the horizontal axis cross-section HC - HC.
  5. A combined headlight of claim 1, 2 or 3, characterised in that said reflector boundary part (5) is a free mirror area.
  6. A combined headlight of claim 1, 2 or 3, characterised in that said reflector boundary part (5) is cut horizontally according to diameter of said objective (4).
  7. A combined headlight of claim 1, 2 or 3, characterised in that said reflector boundary part (5) is not cut horizontally according to the diameter of said objective (4) but forms the circular shape of said headlight.
  8. A combined headlight of claim 1, 2 or 3, characterised in that cutting edges of said shield (3) are incurved so that they incline to said objective (4).
  9. A combined headlight of claim 1, characterised in that said light source (1) is of cylindrical shape in a longitudinal or transversal configuration.
  10. A combined headlight of claim 1, characterised in that said objective (4) is a plano-convex aspherical lens.
EP00301700A 1999-03-02 2000-03-02 A combined headlight for motor vehicles Withdrawn EP1033527A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CZ70499 1999-03-02
CZ1999704A CZ9900704A3 (en) 1999-03-02 1999-03-02 Compound headlight for motor vehicles

Publications (2)

Publication Number Publication Date
EP1033527A2 true EP1033527A2 (en) 2000-09-06
EP1033527A3 EP1033527A3 (en) 2001-10-24

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ID=5462124

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00301700A Withdrawn EP1033527A3 (en) 1999-03-02 2000-03-02 A combined headlight for motor vehicles

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EP (1) EP1033527A3 (en)
CZ (1) CZ9900704A3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016122188A1 (en) 2015-11-20 2017-05-24 Varroc Lighting Systems, s.r.o. Lighting device, in particular a projector system for a headlight for motor vehicles

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4135596A1 (en) * 1991-10-29 1993-05-06 Robert Bosch Gmbh, 7000 Stuttgart, De Vehicle headlamp with discharge lamp and UV filter - has failsafe electrical connection through beam defining aperture on UV filter to switch lamp off if filter breaks
CZ287690B6 (en) * 1996-01-29 2001-01-17 Autopal S. R. O. Headlight with complex reflector
EP0843126A3 (en) * 1996-11-14 2000-04-26 Stanley Electric Co., Ltd. Projector type headlamp
EP0854316B1 (en) * 1997-01-17 2005-04-27 Stanley Electric Co., Ltd. Projector type lamp

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016122188A1 (en) 2015-11-20 2017-05-24 Varroc Lighting Systems, s.r.o. Lighting device, in particular a projector system for a headlight for motor vehicles
US9989207B2 (en) 2015-11-20 2018-06-05 Varroc Lighting Systems, s.r.o. Light device, especially a projector system of a headlight for motor vehicles

Also Published As

Publication number Publication date
EP1033527A3 (en) 2001-10-24
CZ9900704A3 (en) 2000-10-11

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