Objective lens

Details Objective lens Objective lens

2007-10-09

2007-10-09

Assaf, Fayez G. (Department: 2872)

Optical: systems and elements

Light interference

Produced by coating or lamina

C359S586000

Reexamination Certificate

active

10937290

ABSTRACT:
An objective lens on which a beam having parallel light fluxes is incident includes a single element lens and a reflection suppressing coating formed on at least one surface of the single element lens. The reflection suppressing coating is formed such that the reflectivity across a radius of the objective lens exhibits a local maximal value, and the reflection suppressing coating is formed to achieve the following condition:in-line-formulae description="In-line Formulae" end="lead"?0.6<h1/hmax<0.95,in-line-formulae description="In-line Formulae" end="tail"?wherein h1denotes a distance between an optical axis and a position at which the reflectivity exhibits the local maximal value, and hmax denotes a distance between the optical axis and an outermost position of the effective diameter of the objective lens.

REFERENCES:
patent: 6449221 (2002-09-01), Knight et al.
patent: 2004/0264342 (2004-12-01), Hirayama
patent: 2001-52366 (2001-02-01), None

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