EP0075786B1 - Projector, particularly a vehicle headlamp - Google Patents
Projector, particularly a vehicle headlamp Download PDFInfo
- Publication number
- EP0075786B1 EP0075786B1 EP82108538A EP82108538A EP0075786B1 EP 0075786 B1 EP0075786 B1 EP 0075786B1 EP 82108538 A EP82108538 A EP 82108538A EP 82108538 A EP82108538 A EP 82108538A EP 0075786 B1 EP0075786 B1 EP 0075786B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- axis
- sectors
- horizontal
- sector
- reflector
- 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
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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
Definitions
- the invention is based on a headlamp, in particular for motor vehicles, according to the first part of claim 1.
- a headlamp is known from DE-A No. 2826307, whose paraboloid-shaped horizontal sector concentrates the proportion of light beams of relatively high intensity in the far area of the road while the upper and lower sectors with a smaller focal length illuminate the near area of the road with a relatively large luminous flux.
- the features set out in the characterizing part of claim 1 solve the problem set out in the above prior art using technically simple means.
- the portion of the light beam that conventionally illuminates the near area of the roadway is raised and used for illuminating the far area, namely over a relatively large width or in the area of the low-light limit of the low beam.
- the road is also adequately illuminated even when cornering.
- FIG. 1 and 2 show a so-called rectangular spotlight, a rectangular reflector 101, the reflection surface of which consists of a horizontal central sector 102 and an upper and lower sector 103, 104.
- the center sector 102 is arranged symmetrically to the horizontal meridian section plane 105 and is part of a paraboloid of revolution with a relatively large focal length.
- the two sectors 103, 104 are symmetrical to the vertical meridian section plane 106 and are part of an envelope, the vertical section of which is a parabola and the horizontal section of which is an ellipse. Both sectors 103, 104 delimit a section 107 parallel to the horizontal meridian section plane 105.
- the middle sector 102 and both sectors 103, 104 connect flat surfaces 108 which are arranged radially with respect to the optical axis 109 of the reflector 101.
- an opening 110 has been cut out for receiving an incandescent lamp (not shown) with a luminous element for generating a light beam.
- intersection curves resulting from the intersection of planes perpendicular to the axis 109 of the reflector 101 with the reflection surface of the upper and lower sectors 103, 104 are ellipse segments whose semiaxes are perpendicular to the axis 109 of the reflector and whose semiaxis of the ellipse lies in the horizontal central plane.
- the left and right halves of the upper and lower sectors 103, 104 which result from the intersection of the upper and lower sectors with the vertical meridian section plane 106, are slightly unfolded about the axis 111 which is arranged at right angles to the horizontal meridian section plane 105 and through the reflector apex goes (z-axis).
- the horizontal meridian section of the envelope is a hyperbola
- the left and right halves of the upper and lower sectors 103, 104 which result from the intersection of both sectors with the vertical meridian section plane 106, are slightly folded over one another about the axis 111 that is perpendicular to the horizontal meridian section plane 105 is arranged and goes through the reflector apex (z-axis).
Description
Die Erfindung geht aus von einem Scheinwerfer, insbesondere für Kraftfahrzeuge, nach dem ersten Teil des Anspruchs 1. Ein derartiger Scheinwerfer ist aus der DE-A Nr. 2826307 bekannt, dessen paraboloidförmiger Horizontalsektor konzentriert den Lichtbündelanteil verhältnissmässig hoher Intensität in den Fernbereich der Fahrbahn, während der obere und untere Sektor mit einer kleineren Brennweite den Nahbereich der Fahrbahn mit einem verhältnismässig grossen Lichtstrom ausleuchtet.The invention is based on a headlamp, in particular for motor vehicles, according to the first part of claim 1. Such a headlamp is known from DE-A No. 2826307, whose paraboloid-shaped horizontal sector concentrates the proportion of light beams of relatively high intensity in the far area of the road while the upper and lower sectors with a smaller focal length illuminate the near area of the road with a relatively large luminous flux.
Es hat sich in der Praxis herausgestellt, dass die Ausleuchtung des Nahbereichs für die Verkehrsteilnehmer nicht den ursprünglich angenommenen Vorteil aufweist. Darüber hinaus müssen neuzeitige Scheinwerfer eine grosse Horizontalstreuung des Lichtbündels aufweisen, was wiederum eine stark streuende Optik an der Streuscheibe des Scheinwerfers erfordert.It has been found in practice that the illumination of the close range does not have the originally assumed advantage for the road users. In addition, modern headlights must have a large horizontal scatter of the light beam, which in turn requires a strongly scattering optics on the headlight lens.
Durch die im kennzeichnenden Teil des Anspruchs 1 aufgezeigten Merkmale wird erfindungsgemäss das im vorstehenden Stand der Technik dargelegte Problem mit technisch einfachen Mitteln gelöst. Der in herkömmlicher Weise den Nahbereich der Fahrbahn ausleuchtende Lichtbündelanteil wird angehoben und für die Ausleuchtung des Fernbereiches verwendet, und zwar über eine verhältnismässig grosse Breite bzw. im Bereich der HeIIdunkelgrenzedesAbblendlichtes. Darüber hinaus wird die Fahrbahn auch bei Kurvenfahrten noch ausreichend beleuchtet. Bei Verwendung stark vertikal geneigter Streuscheiben ergibt sich noch der Vorteil, dass bereits der Reflektor das Lichtbündel in horizontaler Richtung streut, wobei der Nachteil vermieden wird, dass das Lichtbündel mit zunehmender Seitenstreuung nach unten hin abfällt.According to the invention, the features set out in the characterizing part of claim 1 solve the problem set out in the above prior art using technically simple means. The portion of the light beam that conventionally illuminates the near area of the roadway is raised and used for illuminating the far area, namely over a relatively large width or in the area of the low-light limit of the low beam. In addition, the road is also adequately illuminated even when cornering. When using strongly vertically inclined diffusers there is the advantage that the reflector already scatters the light beam in the horizontal direction, avoiding the disadvantage that the light beam falls downward with increasing side scatter.
Vorteilhafte Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen beschrieben. Mit der Ausgestaltung des Scheinwerfers nach Anspruch 2 werden die Wendelbilder des Abblendlichtbündels unter dessen Helldunkelgrenze abgesenkt. Eine Seitenstreuung der grossen lichtschwächeren Wendelbilder bei gleichzeitiger Konzentration der lichtstarken, kleineren Wendelbilder um den Schnittpunkt der Horizontalen mit der Vertikalen herum und mithin ein verhältnismässig breitgezogenes Lichtbündel ergibt die Weiterbildung des Scheinwerfers mit den Merkmalen eines der Ansprüche 3 oder 4.Advantageous developments of the invention are described in the dependent claims. With the design of the headlamp according to claim 2, the spiral images of the low beam are lowered below the light-dark limit. A side scatter of the large light-weaker helix images with simultaneous concentration of the bright, smaller helix images around the intersection of the horizontal with the vertical and thus a relatively broad beam of light results in the further development of the headlamp with the features of one of claims 3 or 4.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der folgenden Beschreibung näher erläutert. Es zeigen:
- Fig. 1 die Rückansicht eines Rechteckreflektors in verkleinerter Darstellung, und
- Fig. 2 die Innenansicht des Rechteckreflektors in Blickrichtung II von Fig. 1.
- Fig. 1 is the rear view of a rectangular reflector in a reduced view, and
- 2 shows the inside view of the rectangular reflector in viewing direction II of FIG. 1.
Fig. 1 und 2 zeigen von einem sogenannten Rechteckscheinwerfer einen Rechteckreflektor 101, dessen Reflektionsfläche aus einem horizontalen Mittelsektor 102 und einem oberen und unteren Sektor 103, 104 besteht. Der Mittelsektor 102 ist zur horizontalen Meridianschnittebene 105 symmetrisch angeordnet und ist Teil eines Rotationsparaboloides mit einer verhältnismässig grossen Brennweite. Die beiden Sektoren 103, 104 sind zur vertikalen Meridianschnittebene 106 symmetrisch und sind Teil einer Einhüllenden, deren Vertikalschnitt eine Parabel und deren Horizontalschnitt eine Ellipse ist. Beide Sektoren 103, 104 begrenzt eine zur horizontalen Meridianschnittebene 105 paralleler Abschnitt 107. Den Mittelsektor 102 und beide Sektoren 103,104 verbinden ebene Flächen 108, die bezüglich der optischen Achse 109 des Reflektors 101 radial angeordnet sind. Im Scheitelbereich des Reflektors 101 ist eine Öffnung 110 ausgespart für die Aufnahme einer nicht gezeichneten Glühlampe mit einem Leuchtkörper für die Erzeugung eines Lichtbündels.1 and 2 show a so-called rectangular spotlight, a
Die durch den Schnitt von Ebenen senkrecht zur Achse 109 des Reflektors 101 mit der Reflektionsfläche des oberen und unteren Sektors 103, 104 entstehenden Schnittkurven sind Ellipsensegmente, deren Halbachsen senkrecht zur Achse 109 des Reflektors stehen und deren eine Halbachse der Ellipse in der horizontalen Mittelebene liegt.The intersection curves resulting from the intersection of planes perpendicular to the
Die linke und rechte Hälfte des oberen und unteren Sektors 103, 104, die durch den Schnitt der oberen und unteren Sektoren mit der vertikalen Meridianschnittebene 106 entstehen, sind um diejenige Achse 111 geringfügig aufgeklappt, die rechtwinklig zur horizontalen Meridianschnittebene 105 angeordnet ist und durch den Reflektorscheitel geht (z-Achse). Ist hingegen der horizontale Meridianschnitt der Einhüllenden eine Hyperbel, so ist die linke und rechte Hälfte des oberen und unteren Sektors 103, 104, die durch den Schnitt beider Sektoren mit der vertikalen Meridianschnittebene 106 entstehen, um diejenige Achse 111 geringfügig übereinander geklappt, die rechtwinklig zur horizontalen Meridianschnittebene 105 angeordnet ist und durch den Reflektorscheitel geht (z-Achse).The left and right halves of the upper and
Claims (4)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3138641 | 1981-09-29 | ||
DE3138641 | 1981-09-29 | ||
DE3139943 | 1981-10-08 | ||
DE19813139943 DE3139943A1 (en) | 1981-09-29 | 1981-10-08 | HEADLIGHTS, IN PARTICULAR HEADLIGHTS FOR MOTOR VEHICLES |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0075786A1 EP0075786A1 (en) | 1983-04-06 |
EP0075786B1 true EP0075786B1 (en) | 1985-04-10 |
Family
ID=25796412
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82108538A Expired EP0075786B1 (en) | 1981-09-29 | 1982-09-16 | Projector, particularly a vehicle headlamp |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0075786B1 (en) |
DE (2) | DE3139943A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2545152B1 (en) * | 1983-04-27 | 1985-08-16 | Cibie Projecteurs | |
EP0125353B1 (en) * | 1983-05-10 | 1989-10-11 | Corning Glass Works | Automotive headlight having optics in the reflector |
DE3405504A1 (en) * | 1984-02-16 | 1985-08-29 | Robert Bosch Gmbh, 7000 Stuttgart | HEADLIGHTS, IN PARTICULAR HEADLIGHTS FOR MOTOR VEHICLES |
DE3531223A1 (en) * | 1985-08-31 | 1987-03-05 | Bosch Gmbh Robert | HEADLIGHTS, IN PARTICULAR RECTANGULAR HEADLIGHTS, FOR LOW BEAM LIGHTS OF MOTOR VEHICLES |
FR2600024B1 (en) * | 1986-06-17 | 1988-10-21 | Cibie Projecteurs | ADDITIONAL PROJECTOR FOR A CROSSING PROJECTOR FOR A MOTOR VEHICLE |
DE3627696C2 (en) * | 1986-08-14 | 1995-07-27 | Bosch Gmbh Robert | Multi-part reflector for a low beam headlight for motor vehicles |
JP2517368B2 (en) * | 1988-09-27 | 1996-07-24 | 株式会社小糸製作所 | Vehicle headlight and vehicle headlight device |
JP3163569B2 (en) * | 1992-02-18 | 2001-05-08 | 株式会社小糸製作所 | Automotive headlamp |
DE19745467A1 (en) | 1997-10-15 | 1999-04-22 | Bosch Gmbh Robert | Headlamp for use on motor vehicle |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1559212A (en) * | 1920-05-03 | 1925-10-27 | Winston Overton | Reflector for headlights |
DE1142322B (en) * | 1960-04-20 | 1963-01-17 | Pierre Cibie | Long-range headlights with strong close-range lighting |
DE1156727B (en) * | 1960-07-19 | 1963-11-07 | Pierre Cibie | Reflector for motor vehicle headlights |
GB2000266B (en) * | 1977-06-17 | 1982-01-27 | Lucas Industries Ltd | Lamp reflector for a motor vehicle |
-
1981
- 1981-10-08 DE DE19813139943 patent/DE3139943A1/en not_active Withdrawn
-
1982
- 1982-09-16 DE DE8282108538T patent/DE3263003D1/en not_active Expired
- 1982-09-16 EP EP82108538A patent/EP0075786B1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE3139943A1 (en) | 1983-04-14 |
DE3263003D1 (en) | 1985-05-15 |
EP0075786A1 (en) | 1983-04-06 |
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