US PATENT SUBCLASS 362 / 268
.~ Plural serial lens elements or components


Current as of: June, 1999
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362 /   HD   ILLUMINATION

257  DF  LIGHT SOURCE (OR SUPPORT THEREFOR) AND MODIFIER {18}
268.~ Plural serial lens elements or components


DEFINITION

Classification: 362/268

(under subclass 257) Subject matter including a plurality of lens elements or lens components for concentrating or spreading a light beam.

(1) Note. The term "component" as applied to a lens designates either a single transparent mass of refractive material having two opposed refracting surfaces or a grouped plurality of such masses arranged in series along the optical axis of the lens with their adjacent refracting surfaces either in full over all contact or in spaced parallel relation with the spacing being of such small magnitude that it does not enter into the lens computations; the two refracting surfaces of the single mass and the two axially extreme refracting surfaces of the plurality of masses having at least a portion thereof axially air-spaced from all other adjacent refracting surfaces that may be present in the lens. The axial dimension of the air-spacing between either the opposed surfaces of the single mass or the axially extreme surfaces of the grouped plurality of masses and the other adjacent refracting surfaces that may be present in the lens must be of sufficient magnitude to enter into the lens computations in order to limit the axial extent of the lens component.

(2) Note. The term "element" as applied to a lens designates any single transparent mass of refractive material having two opposed refracting surfaces which surfaces are disposed transversely of the optical axis of the lens and spaced there along; i.e., any one of the masses in the above component definition regardless of its spacing from adjacent refracting surfaces that may be present in the lens.

SEE OR SEARCH CLASS

359, Optics: Systems (Including Communication) and Elements,

642+, for lenses, per se, and the appropriate subclasses.