Illumination – Supported by vehicle structure – Light modifier
Patent
1997-07-11
2000-04-18
Sember, Thomas M.
Illumination
Supported by vehicle structure
Light modifier
362518, 362297, B60Q 104
Patent
active
06050711&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
This invention relates to a lighting lamp for powered vehicles, particularly to a headlight for automobiles, which comprises a light source, a reflector, a front lens and a built-in reflector.
BACKGROUND OF THE ART
In China Invention patent No. 91109081.9 an antiglare remote light headlight was proposed. In such a headlight, a light source is placed within a semispheric built-in reflector located above the light axis of reflector, the light source being located behind the focus of reflector. The basic constitution of such an antiglare headlight was described in that invention application with reference to China Invention Patent Application No. 86100659: with a attaching support 7, shown in FIG. 1, and in drawing 1 of above patent application, a built-in reflector 1 is fixed onto reflector 8 to make it located above the light axis 10 of reflector, a light source 2 is mounted within the built-in reflector through a light source lead wiring frame 6 and a front lens is disposed in front of the reflector 8. To prevent the incident light, emitted from the light source to the lower edge of the built-in reflector located in front of the sphere center, from yielding glaring reflective light, China Invention Patent No. 91109081.9 pointed out that the angle between the incident light, emitted from the light source to the front lower edge of the built-in reflector and lying above the normal, and the normal is smaller than the angle between the normal and the light axis of reflector. But, because the reflecting plane defined by the incident light, emitted from the light source to the lower edge of the built-in reflector located in front of the sphere center, and the normal is not certain to lie in the same reflecting plane as the light axis of reflector does, as shown in FIG. 2, in view of the light source, the sphere center of the semispheric built-in reflector and the spatial position of the light axis of reflector all defined according to the invention, the sphere center 12 is located in the horizontal plane in which the central axis of the light source 1 lies and on the edge of the light source on the notch 13 side, and the light axis 11 of reflector and the central axis of the light source are located in the same vertical plane. Apparently, the respective reflecting planes defined by the incident light and the normals passing through the sphere center are not located in the same plane as the light axis of reflector is, the incident light being emitted from the light soure points to the lower edge 21 of the built-in reflector, and these light source points being located above the lines connecting the points on the front lower edge 21 of the bulit-in reflector 4 to the sphere center, that is, above the normals. Therefore, even the relation described above, that the angle between the incident light and the normal is smaller than the angle between the normal and the light axis of reflector, has been met, it is not necessarily able to ensure that the reflective light of the incident light emitted from the light source to the front lower edge 21 of the built-in reflector, sends out horizontally or sends out upwardly, and it is still possible to yield glaring reflective light with an angle between the incident light, reflected from the front lower edge of the built-in reflector to the lower half of the reflector, and the normal to be smaller than the angle between a horizontal line, on the reflecting plane defined by this incident light and the normal and passing through the light incidence point on the reflector, and the normal.
In the antiglare remote light headlights of prior art, to prevent from yielding glaring light, the mounting position of the light source is limited to meet such a position relationship, that is, the angle between the incident light, emitted from the light source to the lower half of the reflector located under the light axis of reflector, and the normal is generally larger than the angle between the horizontal line, on the reflecting plane and passing through the light incid
REFERENCES:
patent: 4238817 (1980-12-01), Fratty
patent: 4914747 (1990-04-01), Nino
patent: 5544021 (1996-08-01), Lopez et al.
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