发明名称 |
Optical pick-up apparatus capable of reading data irrespective of disc type |
摘要 |
An improved optical pick-up apparatus capable of reading data irrespective of disc type capable of reading various kinds of discs having different thicknesses and writing densities using only one pick-up apparatus, which includes a light source; a beam splitter for passing through or splitting a beam from the light source; an objective lens for condensing the beam onto corresponding disc among discs having different thicknesses and different densities; a numerical aperture control unit for controlling an effective numerical aperture of the objective lens so as to execute a focussing operation with respect to a certain disc; and a photodetector for receiving the beam reflected by the disc and transmitted from the beam splitter. |
申请公布号 |
US6026065(A) |
申请公布日期 |
2000.02.15 |
申请号 |
US19950567041 |
申请日期 |
1995.12.04 |
申请人 |
LG ELECTRONICS INC. |
发明人 |
KIM, JIN-YONG;KIM, DAE-YOUNG;LEE, MAN-HYUNG;PARK, SONG-CHAN;SONG, IN-SANG |
分类号 |
G11B7/00;G11B7/0037;G11B7/004;G11B7/09;G11B7/12;G11B7/125;G11B7/135;G11B7/22;G11B19/12;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/00 |
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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