Illumination – Light modifier – Refractor
Patent
1990-03-02
1991-07-16
Husar, Stephen F.
Illumination
Light modifier
Refractor
362209, 362340, 350431, F21V 500
Patent
active
050329634
ABSTRACT:
A light diffusing lens and a method of making such a lens for use in traffic lights etc. and of the known type in which a nearly parallel light beam in projected on a lens adapted to scatter the light within certain predetermined limits, and in which the lens comprises a large number of cavities arranged on the inner surface of the lens, which cavities act as elementary lenses (2) arranged in parallel rows (3) extending in the horizontal direction, and in which each elementary lens (2) comprises at least two integral concave lens parts, namely a lower lens part (5) having the shape of a part of a half-ball, and an upper lens part (6) which is directly integral with said lower lens part (5) and which is stepwise or successively widened to the shape of a bell and which is ended by an upper, straight cross cut lens surface (4). The light diffusing lens is made by spark machining of two co-operating graphite electrodes having strips of graphite material, in which strips cavities corresponding to the elementary lenses (2) are milled by means of a ball cutter.
REFERENCES:
patent: 1385570 (1921-07-01), Miller et al.
patent: 2286201 (1942-06-01), Farrand et al.
patent: 4785385 (1988-11-01), Holst
EB Traffic Systems Aktiebolag
Husar Stephen F.
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