| 摘要 |
In an optical recording medium in which marks are allowed to be written at grooves(G) and information has been recorded beforehand in the form of prepits(PP), the depth of the grooves, Dg, and the depth of the prepits, Dp, satisfy the following relationships, respectively: <DF>Dg < lambda /8n, </DF> and <DF> lambda /8n < Dp < lambda /4n </DF> where lambda is a wavelength of light to be used for recording/reproducing of information signals, and n is an index of refraction of the substrate of the optical recording medium. <IMAGE>
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