(under subclass 121) Subject matter including structure to indicate the proper focus of a light source, or the deviation or extent of deviation from proper focus of the light source.
(1) Note. The proper focus usually exists when the light source is located at the focus of a parabolic reflector or lens. For classification here there must be a distinct disclosure of focusing structure in the specification or claims as opposed to a mere inherent focusing function which is classified in the generic subclass.
SEE OR SEARCH THIS CLASS, SUBCLASS:
123, for the focusing of a filament with respect to some optical element wherein no light pattern is involved.
SEE OR SEARCH CLASS
362, Illumination,
285+, for lamps with a built-in sighting device for focusing the filament of the lamp with respect to the optical projection elements of the lamp.
