| 发明名称 |
OPTICAL HEAD AND OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE USING THE SAME |
| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive optical head capable of realizing easily a ROM/RAM disk as combination, and an optical information recording and reproducing device using the same for corresponding to more high density and interchangeability of optical disk. SOLUTION: The first objective lens 11 with which a numerical aperture NA is set to a range of 0.6<NAS<0.87, the second objective lens 9 with which a numerical aperture NA is set to 0.6 and means 3 and 13 which switch the optical path to the first objective lens and the second objective lens responding to a kind of an information recording carrier are provided in the optical head. |
| 申请公布号 |
JP2001344803(A) |
申请公布日期 |
2001.12.14 |
| 申请号 |
JP20000164856 |
申请日期 |
2000.06.01 |
| 申请人 |
MATSUSHITA ELECTRIC IND CO LTD |
发明人 |
NISHINO SEIJI;WADA HIDEHIKO |
| 分类号 |
G02B5/18;G02B5/30;G02F1/03;G11B5/74;G11B7/135 |
主分类号 |
G02B5/18 |
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