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公开(公告)号:US20060072422A1
公开(公告)日:2006-04-06
申请号:US10535463
申请日:2003-10-28
IPC分类号: G11B7/00
CPC分类号: G11B7/1381 , G11B7/1398
摘要: An optical scanning device (1; 100) for scanning an information layer (4) of an optical record carrier (2; 102). The device comprises a radiation source (11; 111) for generating a radiation beam (12, 15, 20; 112, 115, 120), an objective system (18; 118) for converging the radiation beam on the information layer (4), and an optical filter (200) for regulating the intensity profile of the radiation beam. The filter has an optical axis (119) and comprises a saturable absorber (206) having an absorption that saturates at a threshold incident radiation intensity. For incident radiation beams of intensity less than the threshold, the absorption of the absorber decreases with distance away from the axis.
摘要翻译: 一种用于扫描光学记录载体(2; 102)的信息层(4)的光学扫描装置(1; 100)。 该装置包括用于产生辐射束(12,15,20; 112,115,120)的辐射源(11; 111),用于将辐射束会聚在信息层(4)上的物镜系统(18; 118) 以及用于调节辐射束的强度分布的滤光器(200)。 滤光器具有光轴(119)并且包括具有以阈值入射辐射强度饱和的吸收的可饱和吸收体(206)。 对于强度小于阈值的入射辐射束,吸收体的距离随轴的距离而减小。