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:
Apr. 03, 2012
Filed:
Dec. 19, 2008
Takenori Hirose, Yokohama, JP;
Masahiro Watanabe, Yokohama, JP;
Yasuhiro Yoshitake, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
If an inspection method for inspecting a patterned medium is intended for the nanoimprint process control, it is necessary to measure a correct shape of each pattern element. On the other hand, if the inspection method is intended for the quality control of products, it is necessary to inspect the products on a I00 percent basis. However, the conventional method which uses SEM or AFM could not satisfy these requirements. According to the present invention, IO0-percent inspection of products becomes possible by a method including the steps of: irradiating a surface of a hard disk medium, on which a magnetic material pattern is formed, with a light beam including a plurality of wavelengths; detecting the intensity of a reflected light beam from the hard disk medium on a wavelength basis; calculating a spectral reflectance from the detected intensity of the reflected light beam; and detecting a shape of each pattern element formed on the hard disk medium on the basis of the calculated spectral reflectance.