Optical: systems and elements – Having significant infrared or ultraviolet property – Lens – lens system or component
Patent
1997-08-26
1999-03-09
Henry, Jon
Optical: systems and elements
Having significant infrared or ultraviolet property
Lens, lens system or component
359565, 359743, G02B 1314, G02B 518, G02B 2744
Patent
active
058808795
ABSTRACT:
A low cost objective lens system that provides complete axial color correction with no substantial residual color dependent aberrations such as spherochromatism or chromatic coma. The objective lens system includes a first lens element having an aspherical lens surface and a second lens element having a diffractive optical surface and an aperture disposed between the first and second lens elements. The axial separation of the aspherical lens surface and the diffractive optical surface may be determined by the condition 0.5<L.sub.A /efl<1.25 where L.sub.A is the axial distance from the lens element with the aspherical surface to the lens element with the diffractive optical surface and efl is the effective focal length of the objective lens system. The diffractive optical surface is optically dispersive and is preferably placed on the refractive lens element in the system having the highest optical power. The objective lens system does not exhibit residual color dependent aberrations such as spherochromatism and chromatic coma. The aspherical lens surface is preferably located on the object side of the aperture stop to provide the most advantageous coma correction and spherical aberration correction. The aspherical lens surface further corrects residual monochromatic aberrations such as astigmatism and distortion.
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Henry Jon
Nelson H. Donald
Nikon Corporation
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