Method for reading optical information medium and

专利名称：Method for reading optical information

medium and optical information medium

发明人：Tatsuya Kato,Hajime Utsunomiya,Takashi

Kikukawa,Hiroshi Shingai

申请号：US09714963申请日：20001120公开号：US06430128B1公开日：20020806

专利附图：

摘要：The present invention provides a method for determining optimal read poweradapted for use in an optical information medium wherein super-resolution readout

beyond diffraction limit is conducted. Also provided is an optical information mediumadapted for use in such method. In this method, when the readout is conducted underthe conditions: L<&lgr;/4NA, and when reading light has a wavelength &lgr;, objectivelens of readout optical system has a numerical aperture NA, and minimum mark of themarks constituting the information pattern has a length L, a short mark having a lengthLand a long mark having a length Lmeeting the relations: L<&lgr;/4NA, and L≅&lgr;/4NAare preliminarily formed in the optical information medium, and the optimal power of thereading light is determined on the output when said short mark and said long mark areread.

申请人：TDK CORPORATION

代理机构：Oblon, Spivak, McClelland, Maier & Neustadt, P.C.

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