公开(公告)号：US20050163015A1

公开(公告)日：2005-07-28

申请号：US11038418

申请日：2005-01-21

申请人： Makoto Sato ,  Masakazu Ogasawara

发明人： Makoto Sato ,  Masakazu Ogasawara

IPC分类号： G11B7/00 ,  G11B7/125 ,  G11B7/1275 ,  G11B7/135 ,  G11B7/1367 ,  G11B7/1374 ,  G11B7/139 ,  G11B7/1392

CPC分类号： G11B7/1367 ,  G11B7/1275 ,  G11B7/1374 ,  G11B7/139 ,  G11B7/13922 ,  G11B2007/0006

摘要： A combination of an object lens designed to appropriately converge a light beam L3 on a recording surface of a Blu-ray Disc, and an optical element which gives a phase difference distribution to a light beam L2 but does not give a phase difference distribution to the light beam L3, is provided. Another combination of an object lens designed to appropriately converge the light beam L3 on a recording surface of another optical disc, and an optical element which gives a phase difference distribution to a light beam L1 but does not give a phase difference distribution to the light beam L3, is provided. By the two combinations, information is recorded or reproduced, with respect to four types of recording media, which is a CD, a DVD, the Blu-ray Disc, and said another optical disc.

摘要翻译： 被设计为适当地会聚在蓝光盘的记录表面上的光束L 3的物镜的组合和向光束L 2给出相位差分布但不给出相位差分布的光学元件 提供给光束L 3。 设计成将光束L 3适当地会聚在另一光盘的记录表面上的物镜的另一组合，以及向光束L 1给出相位差分布但不给予相位差分布的光学元件 光束L 3。 通过这两种组合，关于作为CD，DVD，蓝光光盘和所述另一光盘的四种类型的记录介质来记录或再现信息。