发明名称 |
High-density information recording/reproducing method |
摘要 |
PCT No. PCT/JP95/00542 Sec. 371 Date Nov. 20, 1995 Sec. 102(e) Date Nov. 20, 1995 PCT Filed Mar. 25, 1995 PCT Pub. No. WO95/26548 PCT Pub. Date Oct. 5, 1995An optical recording/reproducing method employs a recording laser beam having a first output and a first wavelength, and a reproducing laser beam having a second output lower than the first output and a second wavelength shorter than the first wavelength. A disk-like recording medium is irradiated with the recording and reproducing laser beams by use of an objective lens having an NA of about 0.55 so that a small mark equal to or smaller than about one fourth of a spot size optically defined from the wavelength of the recording laser beam and the NA of the objective lens is formed on the recording medium by a recording characteristic of the recording medium and a shielding plate provided in an optical system for irradiation with the laser beam. Two-dimensional recording is performed as a recording system to arrange marks at lattice points of a two-dimensional lattice which extend in a track direction and a track radius direction. The reproducing system detects a reproduction signal from the mark on the two-dimensional lattice point, and the reproduction signal from each mark is used to perform a signal processing, thereby detecting information.
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申请公布号 |
US5835469(A) |
申请公布日期 |
1998.11.10 |
申请号 |
US19950553433 |
申请日期 |
1995.11.20 |
申请人 |
HITACHI, LTD. |
发明人 |
MAEDA, TAKESHI;SUGIYAMA, HISATAKA;AWANO, HIROYUKI;MIYAMOTO, HARUKAZU;ANDOO, KEIKICHI;WAKABAYASHI, KOUICHIROU;SAITO, ATSUSHI;SHIMANO, TAKESHI;USHIYAMA, JUNKO;KOMODA, OSAMU;SAGA, HIDEKI |
分类号 |
G11B7/004;G11B7/007;G11B7/013;G11B7/085;G11B7/09;G11B7/13;G11B7/135;G11B7/14;G11B11/105;G11B20/14;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/004 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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