Optical: systems and elements – Lens – Including a nonspherical surface
Reexamination Certificate
2004-07-09
2008-08-12
Psitos, Aristotelis M (Department: 2627)
Optical: systems and elements
Lens
Including a nonspherical surface
C369S112230
Reexamination Certificate
active
07411743
ABSTRACT:
The multi-wavelength lens for condensing a plurality of kinds of monochromatic light by refraction is disclosed. The lens comprises a common use area for all monochromatic light on at least one lens surface, the area sectioned into a plurality of aspherical zones each of which having a different refractive power; and step portions, each of which formed between adjacent aspherical zones of the plurality of aspherical zones and having a step height Dj (j=1,2,3,4, and so on, in order of closeness to a lens optical axis) in a direction parallel to the lens optical axis. At least half of the step portions satisfy a following formula when a minimum value and a maximum value of Aij for each wavelength λi are MIN(Aij) and MAX(Aij), respectively:in-line-formulae description="In-line Formulae" end="lead"?MAX(Aij)/MIN(Aij)<3in-line-formulae description="In-line Formulae" end="tail"?where, Aij=absolute(Bij−mij),Bij=(absolute(Dj))*(ni−1)/λi−C, ni is a refractive index of a lens for a wavelength λi, mij is an integral number closest to Bij, and C is a corrective term.
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Hitachi Maxell Ltd.
Oliff & Berridg,e PLC
Psitos Aristotelis M
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