(under subclass 350) Subject matter including a refractive imaging element or a serially arranged group thereof having a significant property in the infrared or ultraviolet area of the electromagnetic spectrum.
(1) Note. Compound lens systems are a plurality of lenses or lens groups arranged in series coaxially along an optical axis, such lenses or lens groups being so spaced along the axis that the second focal plane of the entrant lens of the series lies at or near the first focal plane of the next succeeding lens or lens group of the series whereby the light entrant lens is capable of producing from light rays passing therethrough from an object external to the plurality of lenses an image of that object, which image is viewed or relayed by the said succeeding lens or lens group.
(2) Note. Lens systems designate either a single transparent mass of refractive material having opposed refracting surfaces or a plurality of such masses arranged in series along an optical axis with their opposed refracting surfaces disposed transversely of such axis, the said opposed surfaces being so shaped and spaced that the mass or plurality of masses are capable of producing from light rays passing therethrough from an object external to the mass or masses a single image of that object, which image is also external to the mass or masses of material.
(3) 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.
SEE OR SEARCH THIS CLASS, SUBCLASS:
356, for an infrared lens.
357, for an infrared lens having four or more components. 642+, for lenses in the visible portion of the spectrum.
722+, for lenses which are selective in the visible spectrum by transmitting or blocking certain wavelengths.
SEE OR SEARCH CLASS
427, Coating Processes,
160, for a coating having X-ray, ultraviolet, or infrared properties.
