Lens with an Extended Range of Focus

摘要

The invention relates to a lens which has an extended range of focus, wherein the lens consists of a solid material, the optical surfaces of the lens are transparent and the lens has a focal power distribution. According to the invention, the focal power distribution FG of the lens (1), in relation to a plane perpendicular to the optical axis (10), changes as a function of the radial height r and of the azimuth angle phi of the aperture between a base value of the focal power FL not equal to zero and a maximum value FSmax. Hence, the focal power distribution emerges as;FG(r,phi)=FL+FS(r,phi),;with the spiral focal power component;FS(r,phi)=FSmax(r)*w(phi),;where FSmax(r) depends nonlinearly on the radius and w(phi) is a factor for the focal power component with a spiral profile.

主权项

1. A lens with an extended range of focus, wherein the lens consists of a solid, transparent material and has two manufactured optical surfaces, wherein the lens has a focal power distribution FG, characterized in that
the focal power distribution FG of the lens, in relation to a plane perpendicular to the optical axis, changes as a function of the radial height r and of the azimuth angle phi of the aperture between a base value of the focal power FL not equal to zero and a maximum value FSmax and hence results in the focal power distribution
FG(r,phi)=FL+FS(r,phi),with a spiral focal power component
FS(r,phi)=FSmax(r)*w(phi), where FSmax(r) depends nonlinearly on the radius and w(phi) is a factor for the focal power component with the spiral profile, which, in general, is described by the formulaw(phi)=∑i=1NIiexp[-ai(phi-wi)2],and wi are the peak positions in the angular distribution function; Ii are intensity values of the individual peaks; ai>0 are damping coefficients for the respective peak positions and i is a counter and M≧i is a final value.