Optical system permitting controlled shifting of the beam patter

Details Optical system permitting controlled shifting of the beam patter Optical system permitting controlled shifting of the beam patter

1980-09-29

1983-01-18

Lechert, Jr., Stephen J.

Illumination

Light source and modifier

Plural serial lens elements or components

362 80, 362 83, 362280, 362281, 362308, 362309, 362319, 362328, 362329, 362330, 362331, 362335, 362339, F21V 700

Patent

active

043694888

ABSTRACT:
In a vehicle headlamp, a light deflecting system is provided which comprises two plate-like transparent deflecting elements. Each element has a series of parallel fibs, and the elements are movable one relative to the other at right angles to the length of the ribs. The profiles of the ribs are so chosen that, in a neutral position of the deflecting elements, each rib on one deflecting element faces a rib of complementary shape on the other deflecting element, so that the system imposes no net deflection on light rays passing through. To produce a deflection of these rays, the deflecting elements are shifted relative to the other, so that then, the deflection suffered by the light in passing through one deflecting element is not wholly cancelled by the deflection suffered in passing through the other deflecting element; by suitable choice of the profile of the ribs, the net deflection is the same for all the deflected rays.

REFERENCES:
patent: 3522424 (1970-08-01), Fritsch
patent: 3849642 (1974-11-01), Puyplat
patent: 3999056 (1976-12-01), Faulhaber
patent: 4241388 (1980-12-01), Green

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