Optics: measuring and testing – By alignment in lateral direction
Reexamination Certificate
2005-02-15
2005-02-15
Smith, Zandra V. (Department: 2877)
Optics: measuring and testing
By alignment in lateral direction
C430S022000, C359S569000
Reexamination Certificate
active
06856392
ABSTRACT:
A diffractive optical element having a design wavelength λ, includes a diffractive surface for diffracting predetermined light corresponding to the design wavelength, and a mark shaped so that, with regard to the predetermined light, a phase difference corresponding to a multiple, by an integer, of the design wavelength λ is produced between (i) a light ray, of the predetermined light, as transmitted through or reflected by the mark and (ii) a light ray, of the predetermined light, as transmitted through or reflected by a portion adjacent to the mark, and that, with regard to second light of a second wavelength λ′ different from the design wavelength λ, no phase difference corresponding to a multiple, by an integer, of the second wavelength λ is produced between (a) a light ray, of the second light, as transmitted through or reflected by the mark and (b) a light ray, of the second light, as transmitted through or reflected by a portion adjacent to the mark.
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US Patent Application Publication US 2003/0043462 A1, Sekine, filed Oct. 1, 1999, published Mar. 6, 2003.
Smith Zandra V.
Stock, Jr. Gordon J.
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