Illumination – Vehicle steering mechanism or element moves pivoted lamp or... – Tie rod element controlled
Patent
1989-09-06
1991-11-12
Lazarus, Ira S.
Illumination
Vehicle steering mechanism or element moves pivoted lamp or...
Tie rod element controlled
362346, 362348, 362297, B60Q 100
Patent
active
050652877
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for producing an optically effective arrangement comprising one reflective surface, said arrangement having a light source related to an optical axis which extends in alignment with the optical arrangement for distributing light of said light source reflected by said reflective surface according to a desired light pattern, in particular for application with a vehicular headlight.
Due to legal regulations directed to traffic safety, some known automobile headlights are provided with a masking element arranged in the beam of light between the reflector and a distributor lens in order to meet specific requirements with respect to illumination range, color uniformity, the illumination pattern on the roadway and its marginal area, and light/dark delimitation criteria.
The use of such masking elements, however, is one of the main reasons why such headlights mentioned can neither produce their full light output, nor are they free from the occurrence of color fringes, which runs counter to the requirement for emitting a uniformly colored light.
An automobile headlight is known from DE-AS 18 02 113 by means of which a sharp light/dark delimitation (low beam headlights) is to be achieved without the use of a masking element. For this purpose, the reflector comprises two narrow, axially symmetrical sectors forming the main mirror surface regions which effect the sharp light/dark delimitation. Two parabolic additional mirror surfaces supplement these surfaces. Thus, the known reflector consists of four individual surfaces adjoining at four boundary edges. Such boundary edges cause the reflected light to form irregular light beams directed at the surface to be illuminated, so that a continuous, i.e. smooth, light distribution of high intensity is impossible.
A reflector known from DE-OS 33 41 773 shows a similar structure. Also in this case, the object of distributing the light rays reflected by the reflector in their entirety below the light/dark delimitation, is attained incompletely and discontinuously. The known reflector also consists of two parabolic sectors which are arranged symmetrically around its horizontal axis and to which adjoin two pairs of so-called deflecting surfaces. Instead of four surfaces known from the reflector according to DE-AS 18 02 113, the reflector of DE-OS 33 41 773 comprises six surfaces which adjoin at six boundary edges and which, however, do not substantially improve the disadvantages of discontinuity of light distribution, even though the adjoining boundary edges of the individual reflector surfaces allegedly do not show discontinuities.
The article "Computer Design of Automotive Lamps With Faceted Reflectors", Donohue and Joseph, J. of I.E.S./1972, pp. 36-42 describes an automotive lamp in which the reflector is divided into segments (facets) in such a manner that the reflector alone produces the pattern and lens fluting is eliminated. The many facets, as shown in FIG. 12 of that article, have sharp edges and discontinuities between them. Since each facet is a paraboloidal surface, the intersections, or junctions between the surfaces necessarily are not smooth.
U.S. Pat. No. 4,495,552 discloses a reflector for a vehicle lamp, which consists of a plurality of grid sections. Each of the grid sections shows generally a concave shape both in horizontal and in vertical cross section.
It is the object of the invention to provide a headlight that illuminates a surface to be illuminated with a desired light distribution by optimal utilization of the light source of the headlight, particularly under the consideration of the legal regulations in several countries.
The above object is attained by a method for producing an optically effective arrangement comprising one reflective surface, said arrangement having a light source related to an optical axis which extends in alignment with the optical arrangement for distributing light of said light source reflected by said reflective surface according to a desired light pattern, said method is characterized by the
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Computer Design of Automotive Lamp with Faceted Reflectors, Donohue and Joseph, Journal of the Iluminating Eng. Society, Oct. 1972, pp. 36-42.
Castro Peter E.
Staiger Ulrich
Strobel Joseph
Cox D. M.
Eastman Kodak Company
Lazarus Ira S.
Rushefsky Norman
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