Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
2007-02-13
2007-02-13
Le, Thien M. (Department: 2876)
Registers
Coded record sensors
Particular sensor structure
C359S279000, C369S112010, C369S112030, C369S112230
Reexamination Certificate
active
11013550
ABSTRACT:
A method of analyzing the astigmatic difference of an optical device for analyzing the astigmatism inherent to the optical device by utilizing a condensation performance analysis system while correcting the astigmatic difference inherent to the condensation performance analysis system for analyzing the condensation performance of the optical device to be analyzed. The method of analyzing an astigmatic difference has steps comprising: obtaining the astigmatic difference R(θn) at an angle θnwhile rotating the data points obtained from the optical device about given basic axes; computing a vector coefficient R0in the same direction as the basic axes and another vector coefficient R45at 45 degree to the basic axes by utilizing the maximum angle θmaxat the greatest value of the astigmatic difference R(θn) and the greatest astigmatic difference θmax; computing an astigmatic difference R(θ) at an arbitrary angle θ derived from the vector coefficient R0and the vector coefficient R45by a fitting technique; correcting the vector coefficient R0and the vector coefficient R45by analyzing the condensation performance analysis system using a reference optical device with a known astigmatic difference; and computing the astigmatic difference of the optical device by utilizing the corrected vector coefficient R0and corrected vector coefficient R45.
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Le Thien M.
Nidec Sankyo Corporation
Reed Smith LLP
Trail Allyson N
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