发明名称 |
Optical information recording/reproducing method |
摘要 |
An optical information recording/reproducing method includes that information is recorded on a rotary disk in an optically discriminative form, a light emitted from a light source is focused on the surface of the disk to form a light spot, the information is scanned with the light spot relative thereto in a rotating direction of the disk, and a reflection light or transmitting light from the disk is collected by an optical system to record or reproduce the information. An optically discriminative first information mark having a frequency higher than a spatial frequency resolvable by the optical system is recorded on the surface of the disk, an optically discriminative second information mark having a spatial frequency component higher than that resolvable by the optical system is overwrite-recorded on the first information mark, and a frequency component which is prepared from the first and second information marks and which is higher than the spatial frequency resolvable by the optical system is converted into a spatial frequency component detectable by the optical system.
|
申请公布号 |
US5491683(A) |
申请公布日期 |
1996.02.13 |
申请号 |
US19940360327 |
申请日期 |
1994.12.21 |
申请人 |
HITACHI, LTD. |
发明人 |
MAEDA, TAKESHI;SUGIYAMA, HISATAKA;SUKEDA, HIROFUMI;WAKABAYASHI, KOUICHIROU |
分类号 |
G11B7/00;G11B7/004;G11B7/0045;G11B7/135;G11B11/105;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|