Optical lens

Optical: systems and elements – Lens – Selective wavelength transmitting or blocking

Reexamination Certificate

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C359S738000, C359S589000

Reexamination Certificate

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07826150

ABSTRACT:
A lens includes a central optical portion, a peripheral portion surrounding the central optical portion, a first ZnS coating formed on the central optical portion and the peripheral portion at one side of the lens, and a first MgF2coating formed the central optical, the peripheral portion being free of MgF2coating formed thereon. The optical thickness of the first ZnS coating is one quarter of a wavelength of predetermined light passing therethrough. The optical thickness of the first MgF2coating is one quarter of the wavelength of the predetermined light.

REFERENCES:
patent: 6164777 (2000-12-01), Li et al.
patent: 6813096 (2004-11-01), Ohta
patent: 6898026 (2005-05-01), Jewers et al.
patent: 2009/0323204 (2009-12-01), Huang

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