4 results about "Astigmatism" patented technology

A catadioptric projection objective for microlithography has at least one curved mirror that is deformable and adjusting elements that can deform the deformable mirror. The adjusting elements are matched to given image errors and their correction. The invention is suitable for astigmatism, fourfold wavefront-deformations due to lens heating, compaction, and the like.

The invention relates to an efficient solar omnidirectional concentrator cell component, belonging to the field of solar power generation. A light-collecting plate with a plurality of spherical cavity lenses and a light-converging plate with a plurality of light-converging funnels are connected integrately to form a light-converging component; the bottom of the light-converging component is provided with a solar panel; both the light-converging component and the solar panel are respectively fixed by an upper fixing groove and a lower fixing groove of an outer frame, and then are sealed after firmly installed; and the solar cell slices arranged at intervals inside the spherical cavity lenses, the light-converging funnels and the solar panel are in one-to-one correspondence. On the basis of the light refraction and reflection principles including light collecting, astigmatism and light converging, omnidirectional incident sunlight can be converged on the fixed solar cell slices all the time, thereby increasing the irradiation intensity of sunlight of the cell slices in unit area, achieving higher photoelectric conversion efficiency and reducing the consumption of the cell slices; moreover, no sunlight tracker is mounted, and the efficient solar omnidirectional concentrator cell component has the advantages of simple structure, convenient installation and maintenance, furthest reduced power generation cost per Watt and high cost performance.

An eyepiece includes a focusing apparatus for positioning the area perceived as in focus by the relaxed human eye and for correcting axial ametropia of an eye of a user of the eyepiece and a correction apparatus for adjustable correction of an astigmatism of an eye of a user of the eyepiece.