The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 13, 2007
Filed:
Dec. 15, 2004
Hiroshi Sakai, Nagano, JP;
Hiroshi Sakai, Nagano, JP;
Nidec Sankyo Corporation, Nagano, JP;
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(θ) at an angle θwhile rotating the data points obtained from the optical device about given basic axes; computing a vector coefficient Rin the same direction as the basic axes and another vector coefficient Rat 45 degree to the basic axes by utilizing the maximum angle θat the greatest value of the astigmatic difference R(θ) and the greatest astigmatic difference θ; computing an astigmatic difference R(θ) at an arbitrary angle θ derived from the vector coefficient Rand the vector coefficient Rby a fitting technique; correcting the vector coefficient Rand the vector coefficient Rby 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 Rand corrected vector coefficient R.