Optical: systems and elements – Lens – Selective wavelength transmitting or blocking
Reexamination Certificate
2009-03-26
2010-11-02
Spector, David N (Department: 2873)
Optical: systems and elements
Lens
Selective wavelength transmitting or blocking
C359S738000, C359S589000
Reexamination Certificate
active
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
Chien Yang-Chang
Huang Yi-Mou
Lee Hsin-Ho
Ling Wei-Cheng
Tung Tsai-Shih
Chi Clifford O.
Hon Hai Precision Industry Co. Ltd.
Spector David N
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