Multi-beam optical recording-reproduction device with independen

Details Multi-beam optical recording-reproduction device with independen Multi-beam optical recording-reproduction device with independen

1993-06-08

1994-11-22

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4431, 369 4438, G11B 7095

Patent

active

053675126

ABSTRACT:
A multi-beam optical recording-reproducing device is capable of detecting the focusing and tracking errors of respective beams independently of each other by means of a simple optical system. The optical system for independent tracking error detection may include a wedge prism 39 and a four-partitioned photosensor 42, and that for the independent focusing error detection may include a half prism 33 for dividing the beams into reflected and transmitted portions, first and second knife-edges 34 and 19 for the reflected and transmitted beams, respectively, and a first and second two-partitioned photosensors 35 and 20 for receiving the beams via the first and the second knife-edge, respectively (FIG. 7). Alternatively, the optical system for independent focusing error detection may include a single knife-edge plate 61 having two knife-edges, and a four-partitioned photosensor 64 (FIG. 10), or a wedge prism 71 and an eight-partitioned photosensor 74 (FIG. 12). Further, the optical system for independent tracking error detection may include a concave cylindrical lens 83 (FIG. 14) forming a far field pattern perpendicular to the tracks on the information storage optical medium 9.

REFERENCES:
patent: 4667316 (1987-05-01), Suda et al.
patent: 4695992 (1987-09-01), Aoi
patent: 4775968 (1988-10-01), Ohsato
patent: 4787076 (1988-11-01), Deguchi et al.
patent: 5113378 (1992-05-01), Kimura
patent: 5130965 (1992-07-01), Karaki et al.
patent: 5140577 (1992-08-01), Ohsato
G. Bouwhuis et al., "Principles of Optical Disc Systems", 1985, pp. 261-265.

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