Head lamp for dimming light or fog light of motor vehicles

Details Head lamp for dimming light or fog light of motor vehicles Head lamp for dimming light or fog light of motor vehicles

1986-09-22

1988-09-13

Jones, Larry

Illumination

Light source and modifier

Including reflector

362187, 362305, 362299, F21V 700, F21L 700

Patent

active

047713720

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a head lamp for dimming light or fog light of motor vehicles. A head lamp is known from DE-OS No. 33 34 450, for example, whose lens must have a relatively large opening, so that the light beam illuminates the roadway sufficiently, and also sufficiently illuminate the edges thereof. The dispersion of the light beam, i.e., the splitting up of color of the light beam, in particular by the lens causes a color edge at the light-dark border of the light beam. This color edge, which is generated by color location errors, i.e. chromatic aberration, is annoying; moreover, such a light beam does not comply with legal requirements.
In order to eliminate this disadvantage, at least two lenses are used, of which at least one lens has a negative power of refraction. Such a multiple part lens requires considerable technical manufacturing efforst which is not acceptable for head lamps of motor vehicles.


SUMMARY OF THE INVENTION

It is an object of the present invention to provide a head lamp for dimming lights or fog lights or motor vehicles that eliminates or at least reduces undesirable color fringes from chromatic aberration.
In keeping with this object, and others that will become apparent hereafter, one aspect of the invention resides, briefly stated, in a head lamp for dimming lights or fog lights of motor vehicles that has means for reflecting beams of a light source to form a light beam directed along a path and including a reflector, a diaphragm having an edge arrangale in the path of the light beam; means for portraying an image of the diaphragm edge as a light-dark border of the light beam on a roadway when the light beam is directed along the path and the diaphragm edge is arranged in the path and including an achromatic lens arrangeable in the path after the light beam passes the diaphragm, and means for at least reducing a color fringe otherwise present on the light-dark border of the light beam from chromatic aberration and including a correction element arrangeable in the path of the light beam and associated with the achromatic lens.


DRAWING

A plurality of exemplified embodiments are illustrated in the drawing and are explained in more detail in the description of the figures. The figures illustrate: FIG. 1 a schematic perspective illustration of a head lamp for dimming light of motor vehicles;
FIG. 2 the principle of the first embodiment in a noscale illustration;
FIG. 3 the principle of the second embodiment also in a nonscale illustration;
FIG. 4 a first modification of a connection element in a spatial image illustration in accordance with the second embodiment; and
FIG. 5 a second modification in a spatial illustration of the second embodiment.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

A head lamp for a dimminglight of motor vehicles has a reflector 10, a light source 11 which is defocussed relative to the focal point thereof and an optical axis 12. The beams generated by the light source form a light beam 18 by reflection on reflector 10 and in whose beam path are provided a diaphragm 13 with a deflection edge 14, a lens 15 in front of the diaphragm 13 and whose color is not corrected (being afflicted with chromatic aberration) and a correction element 16 in front thereof represented by a disk.
The light beam 18 being transmitted from reflector 10 results as light spot with a light-dark border (LDB) on a measuring screen 17 which is disposed at a right angle with respect to axis 12, whereby the light-dark border has a horizontal branch 19 and an ascending branch 20 which ascends by 15 degrees with respect thereto. If the correction element 16 would not be present an annoying color edge 21 would be generated on the LDB 19, 20 caused by color location errors (chromatic aberration). However, when the correction element 16 is present in the beam path of the light beam 18, the LDB 19, 20 does not have this annoying color edge 21.
The correction element 16 in FIG. 2 consists of an upper semilens 22 and a lower cylindrical semilens 23,

REFERENCES:
patent: 2578962 (1951-12-01), Bergmans et al.
patent: 3291976 (1966-12-01), Rosenblatt
patent: 3708221 (1973-01-01), Schaefer
patent: 4225903 (1980-09-01), Buchleitner
patent: 4454570 (1984-06-01), Morello
patent: 4607318 (1986-08-01), Lindae et al.

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