发明名称 Optical recording medium
摘要 <p>An optical disc having a transition linear velocity of 8-11 m/s when irradiating continuous light with 11+/-1 mW and a wavelength of 660+/-10 nm using a pickup head with a numerical aperture (NA) of 0.65, and satisfying the following condition: <DF> DELTA R = ¾Rb-Ra¾≤3% </DF> where Rb is a reflectance of an unrecorded area, and Ra is a reflectance of the top of an eye pattern after ten cycles of recording. In one recording mode therefor, the disc is rotated at a constant angular velocity so as to have a linear velocity of 3-4 m/s on an innermost track and a linear velocity of 8-9 m/s on an outermost track. In another mode, the disc is rotated at a constant angular velocity so as to have a linear velocity of 5-6 m/s on an innermost track and a linear velocity of 13-14 m/ s on an outermost track. <IMAGE></p>
申请公布号 EP1406254(A2) 申请公布日期 2004.04.07
申请号 EP20030020816 申请日期 2003.09.12
申请人 RICOH COMPANY LTD. 发明人 DEGUCHI, HIROSHI;YUZURIHARA, HAJIME;HIBINO, EIKO;MIURA, HIROSHI;ABE, MIKIKO;NARUMI, SHINYA;KIBE, TAKESHI;YAMADA, KATSUYUKI;TANIGUCHI, SATOSHI
分类号 G11B7/24;G11B7/243;G11B7/253;G11B7/2534;G11B7/257;G11B7/259;(IPC1-7):G11B7/24 主分类号 G11B7/24
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