| 摘要 |
<p>The present invention is directed to a lens with an optical element (20) formed of a radiant energy transmitting material with a graded index of refraction having a predetermined profile which extends radially from a longitudinal axis (23) of the lens (20). A first surface (24) and an opposing second surface (26) of the optical element (20) extend radially outwards from the longitudinal axis (23) of the lens (20), and one of the first and second surfaces (24, 26) is aspherical. This optical element (20) can be combined coaxially with a second optical element to form a doublet lens. The second optical element is formed of a radiant energy transmitting material with or without a graded index, and when the graded index is included the second element has a gradient profile which is an inverse of the gradient profile of the first optical element (20). The second element has a first predetermined shaped surface arranged for rays of radiant energy from a remote source to be incident thereon, and an opposing second predetermined shaped surface. Each of the first and second surfaces extend radially outwards from a longitudinal axis of the lens.</p> |
