Multifocal lens exhibiting diffractive and refractive powers
First Claim
1. A multifocal lens comprising a plurality of annular zones, each of said anniar zones being subdivided into at least two annular sub-zones, a main sub-zone and a phase sub-zone, said main sub-zones exhibiting refractive-powers such that the combination of said main sub-zones forms a diffractive lens with at least two principal powers and said phase sub-zones exhibit other refractive powers such that the average refractive power of each annular zone is substantially equal to at least one of the principal powers of said diffractive lens.
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Abstract
A multifocal lens including annular zones wherein each annular zone is divided into at least two annular sub-zones. Preferably, no geometric or optical optical steps are present between annular zones or annular sub-zones. The refractive powers within the annular sub-zones are chosen such that the lens exhibits at least two diffractive powers and that at least one of those diffractive powers substantially coincides with the average refractive power of each annular zone.
234 Citations
32 Claims
- 1. A multifocal lens comprising a plurality of annular zones, each of said anniar zones being subdivided into at least two annular sub-zones, a main sub-zone and a phase sub-zone, said main sub-zones exhibiting refractive-powers such that the combination of said main sub-zones forms a diffractive lens with at least two principal powers and said phase sub-zones exhibit other refractive powers such that the average refractive power of each annular zone is substantially equal to at least one of the principal powers of said diffractive lens.
- 19. A multifocal lens exhibiting at least two principal powers D1 and D2 comprising a plurality of annular zones, each of said annular zones being divided into two annular sub-zones, a main sub-zone and a phase sub-zone, wherein the main sub-zone of any given annular zone exhibits a refractive power DG and the phase sub-zone of any given annular zone exhibits a refractive power DS, the values for DG and DS being expressed as follows:
-
25. A multifocal lens exhibiting at least two principal lens powers D1 and D2, the lens comprising a plurality of annular zones, each annular zone j of said annular zones being subdivided into at least two annular sub-zones, a main sub-zone and a phase sub-zone, each main sub-zone of said annular zone j exhibiting a refractive power Dj,G and each phase sub-zone of said annular zone j exhibiting a refractive power Dj,S, and each annular zone j exhibiting an average refractive power DI,j=Dj,G(1−
- pj)+Dj,S×
pj, wherein pj is the fraction of the phase sub-zone of the entire annular zone j, wherein the average refractive power D1,j comprises a first principal zone power, each annular zone j further exhibiting an inner bonding radius rj−
1 and an outer bonding radius rj, said bonding radii providing a power difference Δ
Dj=2π
/(rj2−
rj−
12) of said annular zone j wherein λ
is a design wavelength, and wherein a second principal zone power D2,j is given by D2,j=D1,j±
Δ
Dj, such that said principal lens power D1 is the average of said principal zone powers D1,j, and said principal lens power D2 is the average of said principal zone powers D2,j. - View Dependent Claims (26, 27, 28, 29, 30, 31)
- pj)+Dj,S×
-
32. A multifocal mirror comprising a plurality of annular zones having no geometrc steps between said annular zones, each of said annular zones being further subdivided into at least two annular sub-zones, a main sub-zone and a phase sub-zone, said main sub-zones exhibiting mirror powers such that the combination of said main sub-zones forms a diffractive mirror with at least two principal mirror powers and said phase sub-zones exhibit other mirror powers such that the average mirror powers of each annular zone is substantially equal to at least one of the principal mirror powers of said diffractive mirror.
Specification