EP0317844A2 - Réflecteur pour la formation de la zone de coupure du faisceau dans les projecteurs automobiles - Google Patents

Réflecteur pour la formation de la zone de coupure du faisceau dans les projecteurs automobiles Download PDF

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Publication number
EP0317844A2
EP0317844A2 EP19880118816 EP88118816A EP0317844A2 EP 0317844 A2 EP0317844 A2 EP 0317844A2 EP 19880118816 EP19880118816 EP 19880118816 EP 88118816 A EP88118816 A EP 88118816A EP 0317844 A2 EP0317844 A2 EP 0317844A2
Authority
EP
European Patent Office
Prior art keywords
reflector
diaphragm
edge
plane
light
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Withdrawn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
EP19880118816
Other languages
German (de)
English (en)
Other versions
EP0317844A3 (fr
Inventor
Friedrich Dr. Prinzenhausen
Gerd Dipl.-Math. Fürter
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0317844A2 publication Critical patent/EP0317844A2/fr
Publication of EP0317844A3 publication Critical patent/EP0317844A3/fr
Withdrawn legal-status Critical Current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
    • F21S41/36—Combinations of two or more separate reflectors
    • F21S41/365—Combinations of two or more separate reflectors successively reflecting the light

Definitions

  • the invention is based on a reflector optics for imaging the light-dark boundary in headlights for road vehicles according to the preamble of claim 1.
  • DE-OS 33 17 149 low-beam headlights for road vehicles has become known, which has an elliptical primary reflector and a parabolically shaped secondary reflector , whose optical center is identical to the outer focus of the primary reflector.
  • a luminous element is arranged in the inner focal point of the primary reflector.
  • the headlight has a diaphragm which forms the low beam, which is arranged between the optical center and the apex of the secondary reflector and whose optically effective edge forms the light-dark boundary of the low beam.
  • the parabolic mirror used as a secondary reflector depicts its focal point cleanly towards infinity, whereas it does not exactly reproduce the aperture extended to the side either at infinity or at a predetermined, finite distance. A sharp image of the light-dark boundary can therefore not be achieved with this system.
  • the reflector optics according to the invention with the characterizing features of claim 1 has the advantage that it ensures a sharp image of the light-dark boundary regardless of the type and location of the filament and the type and location of the primary reflector.
  • the primary reflector can be used alone for a desired light distribution, whereby a simple ellipsoid is sufficient to produce a light distribution with illumination bent laterally downwards together with an incandescent lamp with a preferably transverse filament.
  • the light distribution can be corrected and optimized locally in a variety of ways by changing the shape of the reflector.
  • the optically effective edge of the diaphragm has at least two sections which are arranged inclined to one another in the plane of the diaphragm, and that each section is assigned a cylinder ellipse with an identical cross section and an inclination identical to the diaphragm edge, which is penetrate along a cutting plane into which the edge crease also falls.
  • This design enables the use of the reflector optics according to the invention also in low-beam headlamps.
  • FIG. 1 shows a vertical section through a first embodiment of the reflector optics in an unscaled
  • FIG. 2 shows parts of the reflector optics according to FIG. 1 in a perspective view
  • FIG. 3 shows a further embodiment of the reflector optics that is particularly suitable for low-beam headlights of road vehicles, with the primary reflector being omitted.
  • the reflector optics has an ellipsoidal primary reflector 1, the optical axis 2 of which is arranged parallel to the longitudinal center plane of the vehicle, not shown.
  • a luminous element 3 In the inner focal point of the reflector 1 there is a luminous element 3 with a preferably transverse filament.
  • a secondary reflector 4 is formed as part of an ellipse cylinder which is open towards the primary reflector 1 and whose cross sections 6a, 6b, which run perpendicular to its longitudinal axis, all have the same curvature. For the sake of clarity, only two cross sections are shown.
  • an aperture 7 consisting of a flat part, the optically effective edge 8 of which forms the light-dark boundary 11 of the light beam projected onto a screen 10.
  • This screen is set up at a predetermined distance, for example at a distance of 25 m, from the secondary reflector 4. The latter ensures that the edge 8 of the screen 7 appears as a straight line 11 exactly on the plane of the screen 10.
  • the illuminated zone lying below the straight line 11 is designated by 12, the dark zone above the straight line by 13.
  • each cross section 6a, 6b of the secondary reflector 4 has its one focal point 14a or 14b in the optically effective one Edge 8 of the diaphragm 7 and its other focal point 15a or 15b in the horizontal straight line 11 of the screen 10.
  • the beam 16b being an incident beam "obliquely" .
  • Each ray that passes through 8 thus hits exactly the straight line 11 on the screen 10, ie 8 is mapped to 10 in FIG. 11.
  • all light rays that pass the diaphragm 7 hit the screen 10 on one and the same side of 11, in the exemplary embodiment below the straight line 11.
  • the large semiaxis of the ellipse of the secondary reflector 4 is inclined so that all light reflected by it at the primary reflector 1 passes by.
  • the system described above with a straight diaphragm edge 8 is particularly suitable for fog lights.
  • the sections 19a, 19b are each made visible by an ellipse cylinder 20a or 20b by casting shadows on a screen 21 arranged at a predetermined distance from the cylinders.
  • the parts 20a and 20b have an identical cross-section and are likewise arranged inclined at 15 ° to one another. They penetrate each other along a flat cut. The cutting plane also passes through the kink of the edge sections 19a and 19b.
  • the edge section 19a of the diaphragm 18 is sharply imaged by the ellipse cylinder 20a as a straight line 22 on the screen 21, while the edge 19b on the screen 21 is shown as a straight line 23.
  • the light zone at the bottom is designated by 24, the dark zone at the top by 25.
  • the light distribution can be shaped accordingly by the shape of FIG. 3 primary reflector, not shown, can be varied as desired, the image of the filament of the filament also being in the above-mentioned sectional plane.
  • the outlet opening of the headlight can be covered by a not shown, optically ineffective, only transparent pane. This is arranged at a predetermined distance, for example at a distance of 10 cm, from the inner focal point of the secondary reflector. Due to the shape of the secondary reflector, the light emerges in a flat, wide band. The height and width of the pane limit the extent of the illuminated area on the test field defined by the screen 10 or 21.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP88118816A 1987-11-26 1988-11-11 Réflecteur pour la formation de la zone de coupure du faisceau dans les projecteurs automobiles Withdrawn EP0317844A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3740104A DE3740104C1 (de) 1987-11-26 1987-11-26 Reflektoroptik zur Abbildung der Hell-Dunkelgrenze bei Scheinwerfern fuer Strassenfahrzeuge
DE3740104 1987-11-26

Publications (2)

Publication Number Publication Date
EP0317844A2 true EP0317844A2 (fr) 1989-05-31
EP0317844A3 EP0317844A3 (fr) 1990-04-04

Family

ID=6341338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88118816A Withdrawn EP0317844A3 (fr) 1987-11-26 1988-11-11 Réflecteur pour la formation de la zone de coupure du faisceau dans les projecteurs automobiles

Country Status (2)

Country Link
EP (1) EP0317844A3 (fr)
DE (1) DE3740104C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11079085B2 (en) 2018-07-23 2021-08-03 Valeo North America, Inc. Dynamic bending light module

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE382079C (de) * 1923-09-28 Jean Barrollier Scheinwerfer
US1389291A (en) * 1920-01-08 1921-08-30 Evan P Bone Headlamp
GB1504513A (en) * 1974-03-05 1978-03-22 Lucas Electrical Ltd Vehicle lamp unit
DE3317149A1 (de) * 1983-05-11 1984-11-15 Robert Bosch Gmbh, 7000 Stuttgart Abblendlicht-scheinwerfer fuer strassenfahrzeuge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11079085B2 (en) 2018-07-23 2021-08-03 Valeo North America, Inc. Dynamic bending light module

Also Published As

Publication number Publication date
DE3740104C1 (de) 1989-05-18
EP0317844A3 (fr) 1990-04-04

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