发明名称 |
OPTICAL RECORDING MEDIUM AND ITS REPRODUCING DEVICE |
摘要 |
PURPOSE:To record two different kinds of information on two tracks with different recording density on an optical disk and to reproduce selectively or simultaneously the two different kinds of information from the optical disk. CONSTITUTION:Laser beams of two different kinds of wavelength outputted from a laser 101 using an SHG element are converged on an objective lens 109, and a pit 201 of low recording density and a pit 202 of high recording density recorded alternately on the tracks of the optical disk are irradiated with the beams, and signals can be reproduced by detecting reflected light by a first photodetector 111 and a second photodetector 116. |
申请公布号 |
JPH0668474(A) |
申请公布日期 |
1994.03.11 |
申请号 |
JP19920220308 |
申请日期 |
1992.08.19 |
申请人 |
SANYO ELECTRIC CO LTD |
发明人 |
OZEKI YOSHINOBU;OTA OSAMU;TSUCHIYA YOICHI;TERASAKI HITOSHI |
分类号 |
G02F1/37;G11B7/00;G11B7/005;G11B7/007;G11B7/125;G11B7/20;G11B7/24 |
主分类号 |
G02F1/37 |
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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