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:
Jan. 06, 2009
Filed:
Feb. 27, 2006
Seima Kato, Utsunomiya, JP;
Seima Kato, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Disclosed is a method of analyzing an interference fringe, with which method the optical characteristics of an optical system to be examined can be analyzed very precisely. In one preferred form of the invention, the analyzing method includes a step of detecting information related to a first interference fringe produced by interference of two light fluxes, a step of detecting information related to a second interference fringe produced while changing a phase of one of the two light fluxes by π as multiplied by an odd number (e.g., 1π, 3π, . . . ), and a step of detecting averaged information of phase information of the two interference fringes, on the basis of the detected information of the first and second interference fringes and by use of Fourier transform.