发明名称 |
Diffraction element and optical pick-up apparatus having the same |
摘要 |
A diffraction element for an optical pick-up apparatus is provided that enables more accurate focusing control. The diffraction element for an optical pick-up apparatus is divided into first and second regions, each being formed with a grid pattern in which grids are repeated with a predetermined pitch P. The grid pattern in at least one of the first and second regions is tilted by a predetermined angle with respect to a virtual line VL substantially perpendicular to a division line DL that divides the first and second regions.
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申请公布号 |
US7593306(B2) |
申请公布日期 |
2009.09.22 |
申请号 |
US20060337584 |
申请日期 |
2006.01.24 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
KIM BONG-GI;PARK SOO-HAN;YOO JANG-HOON |
分类号 |
G11B7/00;G11B7/135 |
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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