Illumination – Light source and modifier – Louvered or grid type modifier
Patent
1977-05-23
1979-02-27
Nelson, Peter A.
Illumination
Light source and modifier
Louvered or grid type modifier
362 64, 362305, 362309, 362338, 362354, 156252, F21V 2900
Patent
active
041422295
ABSTRACT:
A method of altering the photometric output and distribution of a light beam produced by a lamp having a fluted sealed beam lamp lens cover, the light beam having a certain beam shape which, in the absence of the present invention, does not conform to the photometric specifications for auxiliary low beam automobile head lamps; the latter specifications require the lamps to have specific maximum and minimum candela(s) output at various photometric points within the beam pattern.
Specific areas of certain flutes molded into the lens cover of a non-conforming sealed beam lamp are partially or totally covered with an opaque material or obstructed by a shield to restrict the candela output of unwanted light at various photometric points within the beam pattern, and thus permit the total beam pattern of the treated lamp to meet state and Federal photometric specifications for auxiliary low beam automobile headlamps.
REFERENCES:
patent: 1371179 (1921-03-01), Mattox
patent: 1561417 (1925-11-01), Droll
patent: 1654974 (1928-01-01), Johnson
patent: 1804719 (1931-05-01), Timmons
patent: 1812779 (1931-06-01), Geary
patent: 2830174 (1958-04-01), Gagnier
Dorman William S.
Nelson Peter A.
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