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    • 2. 发明授权
    • Optical pickup using a plano-convex lens as an objective lens for
focusing two light beams
    • 使用平凸透镜作为用于聚焦两个光束的物镜的光学拾取器
    • US06147956A
    • 2000-11-14
    • US310485
    • 1999-05-12
    • Petrus T. JutteJorrit E. De Vries
    • Petrus T. JutteJorrit E. De Vries
    • G11B7/00G11B7/125G11B7/135
    • G11B7/13922G11B7/127G11B7/1374G11B2007/0006
    • A scanning device is designed for optically scanning a first record carrier (1) having a first information plane (3) and a first transparent layer (2) of a first thickness and for scanning a second record carrier (18) having a second information plane (20) and a second transparent layer (19) of a second thickness different from the first thickness. The device comprises a radiation source (5, 22) for generating a radiation beam (6, 23) and an objective lens (9) for focusing the radiation beam through one of the transparent layers on one of the information layers. The radiation source comprising means for adapting the vergency of the radiation beam to a first value for scanning the first record carrier and to a second value for scanning the second record carrier. The objective lens has a convex surface (28) and a concave surface (29), the convex surface facing towards the radiation source. The combination of the change in vergency and the concave surface provides a large field of the objective lens, both when scanning the first and second record carrier.
    • 扫描装置设计用于光学扫描具有第一信息平面(3)和第一厚度的第一透明层(2)的第一记录载体(1),并且用于扫描具有第二信息平面的第二记录载体(18) (20)和不同于第一厚度的第二厚度的第二透明层(19)。 该装置包括用于产生辐射束(6,23)的辐射源(5,22)和用于将辐射束通过其中一个透明层的信息层聚焦的物镜(9)。 辐射源包括用于将辐射束的光束适配为用于扫描第一记录载体的第一值和用于扫描第二记录载体的第二值的装置。 物镜具有凸面(28)和凹面(29),凸面面向辐射源。 当扫描第一和第二记录载体时,扫描变化和凹面的组合提供物镜的大场。