Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Readout method and apparatus for optical information medium
In an optical information medium comprising an information recording layer having a mark train of marks and spaces, the mark train is read out by scanning it with a laser beam and detecting a light intensity change pattern of reflected laser beam. Provided that the reflected laser beam includes polarized light components which define an angle θ with the mark train, a polarized light component giving θ=0 is x0 component, and a polarized light component giving θ=90° is y0 component, the mark train is read out utilizing at least a light intensity change of x0 component. When pits or recorded marks having a size approximate to or below the resolution limit are read out, the present invention allows high read outputs to be obtained and prevents omission of readout signals.
National Institute of Advanced Industrial Science and Technology TDK Corporation
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Takashi Hisako Takashi Nobufumi Junji
Kikukawa Fukuda Nakano Atoda Tominaga