-
1.发明公开Focusing error detecting apparatus 失效Detektorvorrichtung zur Messung der Abweichung der Scharfeinstellung。
公开(公告)号：EP0351675A2
公开(公告)日：1990-01-24
申请号：EP89112505.6
申请日：1989-07-07
发明人： Seya, Masatomo Mitsubishi Denki K.K. , Tadokoro, Michihiro Mitsubishi Denki K.K. , Okada, Kazuo Mitsubishi Denki K.K.
CPC分类号： G11B7/1381 , G02B27/16 , G11B7/0908 , G11B7/0916 , G11B7/13
摘要： A focusing error detecting apparatus comprises an objective lens system (5) for focusing a ray flux on a surface (2) of an optical recording disk (1), two photo detectors (13a, 13b), an optical means (4, 5, 6) including the lens system (5) and a beam splitter (6), for focusing a ray flux reflected from the optical recording disk (1) so that the ray flux comes to the middle of a space formed between the two photo detectors (13a, 13b) when the focal point is formed on the optical recording disk, a combination of two interruption/deflection elements (26a, 26b) and a control device (31) for switching the ray flux transmitted from the optical recording disk (1) at the two positions which correspond to said two photo detectors, two sampling/holding circuits (29, 30) respectively hold differences of output of the two photo detectors (13a, 13b) in correspondence to the switching operations of the interruption/deflection elements (26a, 26b) and the control device (31), and a subtracting circuit (28) for outputting a focusing error signal (S f ) on the basis of the outputs of the sampling/holding circuits (29, 30).
摘要翻译： 聚焦误差检测装置包括用于将光线通量聚焦在光记录盘（1）的表面（2）上的物镜系统（5），两个光检测器（13a，13b），光学装置（4,5） 6），包括透镜系统（5）和分束器（6），用于聚焦从光记录盘（1）反射的光线，使得光线通量到达形成在两个光电检测器之间的空间的中间 当在光记录盘上形成焦点时，两个中断/偏转元件（26a，26b）和用于切换从光记录盘（1）传输的光线通量的控制装置（31）的组合， 在对应于所述两个光电检测器的两个位置处，两个采样/保持电路（29,30）分别对应于中断/偏转元件的切换操作保持两个光电检测器（13a，13b）的输出的差异（ 26a，26b）和控制装置（31），以及减法电路 （28），用于基于采样/保持电路（29,30）的输出输出聚焦误差信号（Sf）。
-
公开(公告)号：EP0351675B1
公开(公告)日：1994-11-02
申请号：EP89112505.6
申请日：1989-07-07
发明人： Seya, Masatomo Mitsubishi Denki K.K. , Tadokoro, Michihiro Mitsubishi Denki K.K. , Okada, Kazuo Mitsubishi Denki K.K.
CPC分类号： G11B7/1381 , G02B27/16 , G11B7/0908 , G11B7/0916 , G11B7/13
-
公开(公告)号：EP0351675A3
公开(公告)日：1990-09-19
申请号：EP89112505.6
申请日：1989-07-07
发明人： Seya, Masatomo Mitsubishi Denki K.K. , Tadokoro, Michihiro Mitsubishi Denki K.K. , Okada, Kazuo Mitsubishi Denki K.K.
CPC分类号： G11B7/1381 , G02B27/16 , G11B7/0908 , G11B7/0916 , G11B7/13
摘要： A focusing error detecting apparatus comprises an objective lens system (5) for focusing a ray flux on a surface (2) of an optical recording disk (1), two photo detectors (13a, 13b), an optical means (4, 5, 6) including the lens system (5) and a beam splitter (6), for focusing a ray flux reflected from the optical recording disk (1) so that the ray flux comes to the middle of a space formed between the two photo detectors (13a, 13b) when the focal point is formed on the optical recording disk, a combination of two interruption/deflection elements (26a, 26b) and a control device (31) for switching the ray flux transmitted from the optical recording disk (1) at the two positions which correspond to said two photo detectors, two sampling/holding circuits (29, 30) respectively hold differences of output of the two photo detectors (13a, 13b) in correspondence to the switching operations of the interruption/deflection elements (26a, 26b) and the control device (31), and a subtracting circuit (28) for outputting a focusing error signal (S f ) on the basis of the outputs of the sampling/holding circuits (29, 30).
-
-
搜索结果
3 条记录 (耗时 0.008 秒)
