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EP0250284A1 - Abblendlichtscheinwerfer ohne Abblendkappe und mit versetzter Konzentration - Google Patents

Abblendlichtscheinwerfer ohne Abblendkappe und mit versetzter Konzentration Download PDF

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Publication number
EP0250284A1
EP0250284A1 EP87401169A EP87401169A EP0250284A1 EP 0250284 A1 EP0250284 A1 EP 0250284A1 EP 87401169 A EP87401169 A EP 87401169A EP 87401169 A EP87401169 A EP 87401169A EP 0250284 A1 EP0250284 A1 EP 0250284A1
Authority
EP
European Patent Office
Prior art keywords
filament
sectors
paraboloids
reflector
axis
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
EP87401169A
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English (en)
French (fr)
Other versions
EP0250284B1 (de
Inventor
Norbert Brun
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.)
Valeo Vision SAS
Original Assignee
Cibie Projecteurs SA
Valeo Vision SAS
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9335599&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0250284(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Cibie Projecteurs SA, Valeo Vision SAS filed Critical Cibie Projecteurs SA
Publication of EP0250284A1 publication Critical patent/EP0250284A1/de
Application granted granted Critical
Publication of EP0250284B1 publication Critical patent/EP0250284B1/de
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 present invention relates to a motor vehicle headlamp intended to form a passing beam.
  • a passing beam is characterized by a cut, that is to say by a generally horizontal orientation limit above which no light ray must be emitted.
  • Figure 1 of the accompanying drawings is shown, by a front view of a screen standardized to 25 meters, the cutout which must be specifically adopted in a number of countries, especially in Europe.
  • This cut-off is made up, for a direction of traffic on the right, by a horizontal half-plane h ⁇ H extending to the left from the longitudinal horizontal axis of the vehicle, and by a half-plane Hc extending to the right of this same axis while being slightly inclined upwards, typically by an angle ⁇ equal to 15 degrees.
  • this configuration is reversed for left-hand traffic.
  • the concentration spot that is to say the region of the illumination field in which the light concentration must be maximum, should preferably be located slightly to the right with respect to the central vertical axis v ⁇ -v passing through the median longitudinal plane of the vehicle, and just below the cut-off, in order to properly illuminate the aisle.
  • This concentration is determined in particular by measuring the luminous flux at points 75R and 50R, which flux must be greater than a minimum authorized value.
  • the desired concentration of the beam as defined above is now easily obtained thanks to very specific optical characteristics of the reflector and the glass.
  • This projector comprises a reflector comprising two sectors in the form of paraboloids of revolution with a common axis, arranged symmetrically with respect to said axis and delimited by two axial planes, one horizontal, and the other forming an angle equal to l with the latter.
  • the two sectors in the form of paraboloids have the same focal point, located axially above the center of the filament, and the same focal distance.
  • the main advantage of such a projector is a considerable increase in the output luminous flux, due to the elimination of the obscuring cup.
  • FIG. 2 of the appended drawings which represents the isocandela curves C i of the illumination produced by such a projector of the prior art on a screen standardized to 25 meters
  • the spot of concentration obtained with this projector (hatched area T) is essentially centered on the longitudinal axis of the vehicle.
  • Such positioning has two major drawbacks.
  • such a spot of central concentration is extremely sensitive to the vertical oscillations of the vehicle.
  • the optimization of the visibility distance given by a low beam projector leads to superimposing the concentration spot on point 75R of the European regulations, that is to say a shift of said spot to the right and upwards.
  • the solution which would consist in shifting this spot of concentration to the right and upwards using deflecting prisms or the like on the lens of the projector is difficult to implement in practice, because it results in degradation. sensitive to the cut, and to a certain risk of increasing the rising radii, therefore dazzling for the vehicles coming opposite, due to the inevitable inaccuracies in the production of the closing glass by molding.
  • the present invention aims to provide an improvement to a dipped headlamp without cup, thanks to which one obtains, in addition to a completely satisfactory cut-off, a concentration of the light beam correctly shifted to the right with respect to the central longitudinal axis of the vehicle.
  • the invention is characterized in that: the two sectors in the form of paraboloids have different focal distances, their foci being respectively located axially on either side of the center of the filament, and -
  • the reflector has reflective surfaces, extending beyond said axial planes and effecting without discontinuity the connection between the two sectors in the form of paraboloids of different foci, which bring below said cut the images of the filament that they reflect.
  • It includes a lamp provided with an axial filament 100, a reflector 200 and a distribution glass 300 closing the projector at the front thereof.
  • the filament 100 which can be schematized by a cylinder of length 2l and radius r, is here shifted upwards by a distance equal to its radius r with respect to the optical axis Ox of the projector. In this way, the emissive surface of the filament is essentially tangent to said axis Ox.
  • the planes xOy and xOs define between them two sectors 201 and 202 which are each in the form of a paraboloid. More specifically, the focal point of the first parabolic sector 201 is indicated at F1 in FIGS. 3 and 5, and is located near the rear axial end of the filament. The focal point F2 of the second parabolic sector 202 is in turn located near the other end of the filament. The corresponding focal distances f1 and f2 are determined so that these foci F1 and F2 are located, on either side of the center F O of the filament in the axial direction, equidistant from it, as will be seen in more detail far.
  • the images from zones 201 and 202 of the reflector being suitably positioned to create in part the desired beam, as regards both the concentration spot and the inclined cut, it is not necessary to make intervene important corrective optical elements on the closing glass 300 of the projector to deflect the light rays.
  • the homologous ice zones of zones 201 and 202 will therefore be non-deviating or slightly deviating.
  • the other sectors 203 to 206 of the reflector are used according to the invention, on the one hand to reinforce the intensity of the beam, and on the other hand to better define the cut-off h ⁇ H in the half left plan.
  • these sectors are determined so that the images of the filament they form all have their highest point located on the cut h ⁇ Hc, or at least in the very close vicinity thereof.
  • these zones 203 to 206 are constituted by deflecting surfaces which ensure with second order continuity the transition between the sectors 201 and 202 in the form of paraboloids of different foci, respectively in the upper region and in the lower region of the reflector.
  • the paraboloidal zones 201 and 202 of different foci have the equation:
  • - (x, y, z) are the Cartesian coordinates along the axes represented in FIGS. 3 and 4, -f o is an imaginary focal distance, equal to the distance along Ox between the origin O and the axial center, called F O , of the filament 100, -l is the half length of the filament, -r is the radius of the filament, and -n is a positive real parameter chosen in the interval [1, + ⁇ ].
  • f o is therefore the average of the focal lengths of the respective sectors 201 and 202.
  • the images of the filament 100 will be shifted to the right by both the sector 201 and by the sector 202, to initiate the cut inclined along Hc, as shown in FIG. 6.
  • the value of the latter will be chosen so that the concentration spot thus determined is substantially superimposed with the point "75R" of European regulations.
  • Zones 203 and 204 are determined by the following equation: the constants, parameters and variables being the same as above.
  • the areas 205 and 206 have the equation: the constants, parameters and variables being as above, and the angle ⁇ having in the present example a value of 15 °, that is to say the angle of the half-plane Hc of the cut on the right with respect to the horizontal h ⁇ -h .
  • equation (3) is deduced from equation (2) indicated above by a change of coordinates corresponding to a rotation of the angle ⁇ around the axis Ox.
  • the images P56 of the reflecting surfaces 205 and 206 mainly define the inclined cutoff Hc of the straight part of the beam, by extending the cutoff already initiated at the concentration spot by the areas 201 and 202.
  • this defect will be mitigated during the machining and polishing steps of the reflector or its mold, until it disappears and does not cause any apparent defect in the projected light.
  • the present invention is in no way limited to the embodiment described above, but includes any variant in accordance with its spirit.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP87401169A 1986-05-26 1987-05-25 Abblendlichtscheinwerfer ohne Abblendkappe und mit versetzter Konzentration Expired - Lifetime EP0250284B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8607462 1986-05-26
FR8607462A FR2599121B1 (fr) 1986-05-26 1986-05-26 Projecteur de croisement sans coupelle a concentration decalee

Publications (2)

Publication Number Publication Date
EP0250284A1 true EP0250284A1 (de) 1987-12-23
EP0250284B1 EP0250284B1 (de) 1990-04-04

Family

ID=9335599

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87401169A Expired - Lifetime EP0250284B1 (de) 1986-05-26 1987-05-25 Abblendlichtscheinwerfer ohne Abblendkappe und mit versetzter Konzentration

Country Status (7)

Country Link
US (1) US4772988A (de)
EP (1) EP0250284B1 (de)
JP (1) JPH0668922B2 (de)
BR (1) BR8702675A (de)
DE (1) DE3762161D1 (de)
FR (1) FR2599121B1 (de)
SU (1) SU1542425A3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0331928A2 (de) * 1988-03-11 1989-09-13 Hella KG Hueck & Co. Reflektor für abgeblendete oder abblendbare Kraftfahrzeugscheinwerfer
EP0558949A2 (de) * 1992-03-05 1993-09-08 Robert Bosch Gmbh Abblendlichtscheinwerfer für Kraftfahrzeuge
FR2802285A1 (fr) * 1999-12-09 2001-06-15 Koito Mfg Co Ltd Phare de vehicule et son procede de fabrication

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3731232A1 (de) * 1987-09-17 1989-03-30 Bosch Gmbh Robert Scheinwerfer fuer fahrzeuge, insbesondere scheinwerfer fuer kraftfahrzeuge
JPH0658761B2 (ja) * 1988-11-08 1994-08-03 株式会社小糸製作所 前照灯用反射鏡
FR2639888B1 (fr) * 1988-12-07 1993-08-13 Valeo Vision Projecteur de vehicule automobile, comportant un reflecteur a surface complexe a zones intermediaires modifiees
JPH0368305U (de) * 1989-11-02 1991-07-04
US5136007A (en) * 1989-12-08 1992-08-04 The B. F. Goodrich Company High char yield silazane derived preceramic polymers and cured compositions thereof
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
JP2610546B2 (ja) * 1991-01-25 1997-05-14 株式会社小糸製作所 車輌用前照灯の反射鏡
JP2668306B2 (ja) * 1992-02-04 1997-10-27 株式会社小糸製作所 車輌用前照灯の反射鏡
JP2626864B2 (ja) * 1992-12-25 1997-07-02 株式会社小糸製作所 車輌用前照灯の反射鏡
JP2764369B2 (ja) * 1993-07-26 1998-06-11 株式会社小糸製作所 車輌用前照灯の反射鏡
US5515255A (en) * 1994-11-14 1996-05-07 Sterner Lighting Systems Incorporated Lamp reflector
JP3202155B2 (ja) * 1995-10-18 2001-08-27 株式会社小糸製作所 車輌用灯具の反射鏡及びその形成方法
JP3145910B2 (ja) * 1995-11-02 2001-03-12 株式会社小糸製作所 車輌用前照灯
FR2740858B1 (fr) 1995-11-08 1998-01-23 Valeo Vision Projecteur de vehicule automobile, comportant un miroir capable d'engendrer par lui-meme un faisceau a coupure en v
CZ287690B6 (cs) * 1996-01-29 2001-01-17 Autopal S. R. O. Světlomet s komplexním reflektorem
FR2774149B1 (fr) 1998-01-28 2000-04-14 Valeo Vision Projecteur de vehicule automobile, comportant une source transversale et apte a engendrer un faisceau a coupure non rectiligne
FR2794845B1 (fr) 1999-06-08 2001-08-17 Valeo Vision Projecteur equipe d'une lampe a double source, notamment projecteur croisement route pour vehicule automobile
FR2804495B1 (fr) 2000-01-31 2002-06-07 Valeo Vision Projecteur de vehicule automobile, comportant une source transversale et apte a engendrer un faisceau a coupure non rectiligne
FR2819042B1 (fr) 2000-12-28 2003-03-14 Valeo Vision Projecteur pour vehicule, comprenant un reflecteur et une source lumineuse horizontale orientee transversalement a un axe optique du reflecteur
FR2822113B1 (fr) * 2001-03-14 2003-05-02 Valeo Vision Agencement d'un dispositif d'eclairage dans un vehicule automobile
FR2822550B1 (fr) * 2001-03-21 2003-05-16 Valeo Vision Projecteur de vehicule automobile a miroir et element de deviation conjugues

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE656721A (de) * 1964-12-07 1965-04-01
FR1400370A (fr) * 1963-06-17 1965-05-28 Réflecteur pour projecteur lumineux
DE2921474A1 (de) * 1979-05-26 1980-11-27 Daimler Benz Ag Scheinwerferreflektor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1545880A (fr) * 1967-10-05 1968-11-15 Cibie Projecteurs Nouveaux perfectionnements aux projecteurs à faisceau coupé, notamment aux projecteurs de croisement pour véhicules automobiles
DE3340462C1 (de) * 1983-11-09 1985-04-18 Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt Abgeblendeter Fahrzeugscheinwerfer
US4566056A (en) * 1984-03-08 1986-01-21 Stanley Electric Co., Ltd. Headlamp for vehicle
GB2162625B (en) * 1984-07-31 1988-01-27 Stanley Electric Co Ltd Headlamp for vehicle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1400370A (fr) * 1963-06-17 1965-05-28 Réflecteur pour projecteur lumineux
BE656721A (de) * 1964-12-07 1965-04-01
DE2921474A1 (de) * 1979-05-26 1980-11-27 Daimler Benz Ag Scheinwerferreflektor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0331928A2 (de) * 1988-03-11 1989-09-13 Hella KG Hueck & Co. Reflektor für abgeblendete oder abblendbare Kraftfahrzeugscheinwerfer
EP0331928A3 (de) * 1988-03-11 1990-06-20 Hella KG Hueck & Co. Reflektor für abgeblendete oder abblendbare Kraftfahrzeugscheinwerfer
AU622437B2 (en) * 1988-03-11 1992-04-09 Hella Kg Hueck & Co. Reflector for motor-vehicle headlights which are dimmed or may be dimmed
EP0558949A2 (de) * 1992-03-05 1993-09-08 Robert Bosch Gmbh Abblendlichtscheinwerfer für Kraftfahrzeuge
EP0558949A3 (de) * 1992-03-05 1994-03-02 Bosch Gmbh Robert
US5461549A (en) * 1992-03-05 1995-10-24 Robert Bosch Gmbh Low beam headlight for motor vehicles
FR2802285A1 (fr) * 1999-12-09 2001-06-15 Koito Mfg Co Ltd Phare de vehicule et son procede de fabrication

Also Published As

Publication number Publication date
EP0250284B1 (de) 1990-04-04
FR2599121A1 (fr) 1987-11-27
SU1542425A3 (ru) 1990-02-07
BR8702675A (pt) 1988-02-23
JPS62285302A (ja) 1987-12-11
FR2599121B1 (fr) 1988-09-16
US4772988A (en) 1988-09-20
DE3762161D1 (de) 1990-05-10
JPH0668922B2 (ja) 1994-08-31

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