EP0247936A1 - Abblendlichtscheinwerfer ohne Abblendkappe und mit versetzter Konzentration - Google Patents
Abblendlichtscheinwerfer ohne Abblendkappe und mit versetzter Konzentration Download PDFInfo
- Publication number
- EP0247936A1 EP0247936A1 EP87401170A EP87401170A EP0247936A1 EP 0247936 A1 EP0247936 A1 EP 0247936A1 EP 87401170 A EP87401170 A EP 87401170A EP 87401170 A EP87401170 A EP 87401170A EP 0247936 A1 EP0247936 A1 EP 0247936A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filament
- quadrants
- reflector
- axis
- projector
- 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
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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 dipped headlight for a motor vehicle, in which the light beam is located below a cut-off limit defined by two horizontal half-planes slightly offset in height relative to each other.
- the cutoff is defined approximately, on a standardized screen, by two horizontal half-straight lines situated on either side of the axis of the projector, the half-line on the right side being at the level of the horizon and the half-line on the left side being offset by about 1.5% below the horizontal.
- the region of maximum illumination imposed is shifted to the right relative to the axis of the projector.
- the beams meeting these standards are most often obtained using a projector comprising a transverse filament lamp cooperating with a reflector or parabolic mirror of relatively high focal distance, so as to reduce the thickness of the beam and consequently minimize the excess thickness created by the deflecting prisms on the closing glazing.
- a headlamp comprising a reflector of complex shape capable of forming images of the filament below a cut of general horizontal orientation, allowing the use of reduced focal distances, and consequently a much greater flux recovery.
- a projector comprises an axial filament lamp emitting freely all around it, a reflector having an axis extending below the axis of the filament parallel to it and comprising a surface without discontinuity, and a closing glass placed in front of the reflector and capable of distributing said beam in the horizontal direction.
- Such a projector is shown diagrammatically, in horizontal section, in FIG. 1. It comprises a unitary reflector 10 comprising a first mirror 10a for the crossing function, the axis 12a of which is offset to the right (downwards in the figure) at an angle 6, and a second mirror 10b, integral with the first, whose axis 12b is located in the axis of the road.
- the inclination which must be given to the reflector of the dipped beam is a function of the focal distance used and the optical characteristics of the closing lens. More precisely, the reflector must be inclined laterally by an angle corresponding to the angular half-width of the images participating in the concentration; however, the width of these images depends on the size of the areas of the closing glass dedicated to concentration, as well as on the focal distance of the reflector, these parameters being a function of the dimensions allocated to the dipped headlight in the vehicle, and more generally of the specifications.
- the invention aims in particular to eliminate this demolding problem by proposing a dipped headlight which requires no tilting of its axis to the right in order to obtain the offset concentration spot.
- the filament, and therefore the lamp therefore retain an orientation parallel to the axis of the track, and a twin-mirror projector incorporating such a crossing projector can be produced easily and at moderate cost, with a release of the two mirrors according to the same axis.
- the dipped headlight according to the present invention is characterized in that the reflector comprises two first diametrically opposite quadrants, the surfaces of which approach at least approximately two portions of paraboloids, the foci of which are each located in the vicinity of a respective axial end of the filament, for generating images of the filament creating a light concentration situated below the cut and offset laterally with respect to the axis of the projector, the other two quadrants being constituted by surfaces ensuring the gradual transition and continues between the first two quadrants by creating images of the filament located mainly below the cut.
- the projector according to the invention shown diagrammatically in FIGS. 2 to 4, comprises a lamp with an axial cylindrical filament 100 of length l and of radius r, a reflector or mirror 200 and a distribution glass 300 closing the projector.
- the axis of the filament 100 is not coincident with the axis Ox of the reflector, but is shifted upwards by a distance equal to its radius r. In this way, the lowest part of the emissive surface of the filament is tangent to said axis Ox.
- the surface of the reflector is a surface without discontinuity, determined so that it forms images of the filament which are for the most part located below a horizontal plane and, as will be seen below, whose most point top is located on this horizontal plane or entirely in its vicinity. It is also determined so that the concentration spot obtained is shifted to the right (or to the left depending on the direction of traffic) relative to the axis of the road.
- absence of discontinuity is meant a second order continuity, that is to say that at any point on any line drawn on the surface, the tangent planes are the same on both sides of this line. The surface therefore shows no breakage.
- This arrangement makes it possible, in practice, to produce real surfaces having very good conformity with the theoretical surfaces, in particular avoiding the defects specific to certain mirrors of the prior art having offset paraboloids. In particular, such continuity makes the reflector perfectly stampable.
- the reflector is divided into four zones or sectors 201 to 204, defined mathematically below, the above-mentioned continuity being ensured in particular at the interface between these sectors.
- the four sectors separated from each other by the horizontal plane xOy and by the vertical plane xOz, each define a quadrant.
- quadrant will be used to denote any sector delimited by two planes, substantially horizontal and substantially vertical respectively.
- the surfaces of quadrants 201 and 202 are designed to generate images of the filament which create a spot of concentration shifted downward and to the right with respect to the axis Ox.
- the surfaces of the quadrants 203 and 204 are determined to ensure with the above-mentioned continuity the transition between the quadrants 201 and 202, and, on a functional level, to generate images of the filament all located in the vicinity of the axis of the projector, but mostly below the horizontal plane passing through its axis. In particular, the centers of all these images are located below this plane.
- ⁇ f is equal to the difference f 2 - f 1 and is approximately equal to the length ⁇ of the filament.
- FIGS 5 to 8 are shown, by isocandela curves on screen C 1 to C 4 , the illuminations provided by the quadrants 201 to 204 of the reflector 200 of Figures 2 to 4 in the absence of closing glass.
- quadrant 201 produces a spot of concentration which is shifted downwards and to the right with respect to the reference center H of the screen (intersection of said screen with the axis Ox of the projector), in the same way as quadrant 202.
- This shifted concentration spot initiates, as we can observe, the right half-cut of the passing beam.
- the total light distribution, obtained by superimposing the illuminations represented in FIGS. 5 to 8, is represented in FIG. 9 by isocandela curves C T on a projection screen.
- FIG. 10 represents, in front view, a possible embodiment of a closing glass particularly well suited to the mirror 200 described above. It comprises thirteen zones 301 to 313 arranged as shown. The zones 301 and 313 are each, respectively, the homolog of a large part of the surface of the quadrants 203 and 204 of the mirror. These zones are non-deflecting, or very little deflecting, so as not to alter the formation of the right cut of the beam.
- the central zones 306, 307 and 308 will be able to effect a strong horizontal deflection, in particular to give the beam the large width required.
- the remaining areas of the glass 300 will be moderately deviating horizontally, in particular in order to increase the illumination on the left by initiating the corresponding half-cut and to further extend the right cut as initiated by the part of the beam crossing the areas 301 and 313.
- the axis of the filament, and therefore of the lamp of this low beam projector is strictly parallel to the axis of the road. It is easy in this way to associate the low beam headlamp with a headlamp in the form of a single block comprising a bi-mirror reflector.
- the axis of the lamp of a road projector being preferably parallel to the axis of the road, the flanges of the two mirrors will therefore be strictly parallel, which allows the realization of the bi-mirror reflector by an operation particularly simple molding, without difficulty in demolding.
- such a vertical offset will be of the order of 0.5 mm for a parabolic mirror having a focal distance of 22.5 mm.
- f 14 and fI3 are focal distances corresponding to two distinct focal points located in the vicinity of the end of the filament closest to the origin of the coordinates
- f 23 and f 24 are focal distances corresponding to two distinct focal points located in the vicinity of the end of the filament furthest from the origin of the coordinates.
- Each of the surfaces defined above ensures the continuous transition between the neighboring surfaces, continuity being also ensured at the interface between these surfaces two by two.
- the general concepts of the invention can be implemented in reflectors of low height, thanks to the particularly high light output which is obtained.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8607461 | 1986-05-26 | ||
FR8607461A FR2599120B1 (fr) | 1986-05-26 | 1986-05-26 | Projecteurs de croisement sans coupelle a concentration decalee |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0247936A1 true EP0247936A1 (de) | 1987-12-02 |
EP0247936B1 EP0247936B1 (de) | 1990-06-27 |
Family
ID=9335598
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87401170A Expired - Lifetime EP0247936B1 (de) | 1986-05-26 | 1987-05-25 | Abblendlichtscheinwerfer ohne Abblendkappe und mit versetzter Konzentration |
Country Status (5)
Country | Link |
---|---|
US (1) | US4754374A (de) |
EP (1) | EP0247936B1 (de) |
JP (1) | JPH0793042B2 (de) |
DE (1) | DE3763453D1 (de) |
FR (1) | FR2599120B1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2294536A (en) * | 1994-10-27 | 1996-05-01 | Carello Lighting Plc | Vehicle headlight with a complex-surface reflector |
FR2982929A1 (fr) * | 2011-11-22 | 2013-05-24 | Valeo Vision | Dispositif d'emission de lumiere pour projecteur de vehicule automobile |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2622564B2 (ja) * | 1986-12-30 | 1997-06-18 | ヴァレオ ヴイジョン | カットオフによって限定されたビームを放射する、変形底部を有する自動車用前照灯 |
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 |
US5045982A (en) * | 1989-03-17 | 1991-09-03 | Whelen Technologies, Inc. | Wide angle warning light |
JPH0368305U (de) * | 1989-11-02 | 1991-07-04 | ||
GB8927903D0 (en) * | 1989-12-09 | 1990-02-14 | Carello Lighting Plc | Lamp assembly |
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 |
DE4206881A1 (de) * | 1992-03-05 | 1993-09-09 | Bosch Gmbh Robert | Abblendlichtscheinwerfer fuer kraftfahrzeuge |
JP2750647B2 (ja) * | 1992-08-14 | 1998-05-13 | 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 |
CZ287690B6 (cs) * | 1996-01-29 | 2001-01-17 | Autopal S. R. O. | Světlomet s komplexním reflektorem |
JP2002251904A (ja) * | 2001-02-23 | 2002-09-06 | Ichikoh Ind Ltd | 車両用灯具 |
Citations (3)
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 (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE921474C (de) * | 1948-10-02 | 1954-12-20 | Siemens Ag | Einrichtung zur dielektrischen Behandlung eines band- oder fadenfoermigen Behandlungsgutes |
FR2536502B1 (fr) * | 1982-11-19 | 1987-01-09 | Cibie Projecteurs | Projecteur de croisement pour vehicule automobile |
US4506315A (en) * | 1982-12-08 | 1985-03-19 | Ichikoh Industries, Ltd. | Vehicle headlamp |
US4494176A (en) * | 1984-03-14 | 1985-01-15 | General Electric Company | Lamps having multiple and aimed parabolic sections for increased useful light output |
DE3417034A1 (de) * | 1984-05-09 | 1985-11-14 | Robert Bosch Gmbh, 7000 Stuttgart | Scheinwerfer, insbesondere abblendlicht-scheinwerfer, fuer kraftfahrzeuge |
-
1986
- 1986-05-26 FR FR8607461A patent/FR2599120B1/fr not_active Expired
-
1987
- 1987-05-22 US US07/053,312 patent/US4754374A/en not_active Expired - Lifetime
- 1987-05-25 EP EP87401170A patent/EP0247936B1/de not_active Expired - Lifetime
- 1987-05-25 DE DE8787401170T patent/DE3763453D1/de not_active Expired - Lifetime
- 1987-05-26 JP JP62127289A patent/JPH0793042B2/ja not_active Expired - Fee Related
Patent Citations (3)
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 (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2294536A (en) * | 1994-10-27 | 1996-05-01 | Carello Lighting Plc | Vehicle headlight with a complex-surface reflector |
GB2294536B (en) * | 1994-10-27 | 1998-06-17 | Carello Lighting Plc | Vehicle headlight with a complex-surface reflector |
FR2982929A1 (fr) * | 2011-11-22 | 2013-05-24 | Valeo Vision | Dispositif d'emission de lumiere pour projecteur de vehicule automobile |
EP2597360A1 (de) * | 2011-11-22 | 2013-05-29 | Valeo Vision | Lichtemittierende Einrichtung für Kraftfahrzeugscheinwerfer |
Also Published As
Publication number | Publication date |
---|---|
JPS62285301A (ja) | 1987-12-11 |
FR2599120B1 (fr) | 1988-09-16 |
DE3763453D1 (de) | 1990-08-02 |
US4754374A (en) | 1988-06-28 |
EP0247936B1 (de) | 1990-06-27 |
JPH0793042B2 (ja) | 1995-10-09 |
FR2599120A1 (fr) | 1987-11-27 |
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