Device for inspecting the surface of disc-shaped recording mediu

Details Device for inspecting the surface of disc-shaped recording mediu Device for inspecting the surface of disc-shaped recording mediu

1995-06-05

1999-12-14

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4437, G11B 709

Patent

active

060026561

ABSTRACT:
A device for inspecting the surface of a disc-shaped recording medium is provided. The inspection device is capable of performing track control unaffected by the widths of the land and the groove in the radial direction of the recording medium in inspecting the entire surface of a data recording region of the recording medium. The device has a spindle motor 1, an optical pickup 2 and a thread motor 3. While an output signal is supplied from a spot size control section 4b within a signal detection unit 4, two sub-beams are radiated from the optical pickup for tracking control. These sub-beams are radiated to the vicinity of the boundary region between the land sandwiched between the grooves where the light volume of the reflected light of the radiated light is minimized.

REFERENCES:
patent: 4817073 (1989-03-01), Suzuki
patent: 4887253 (1989-12-01), Tateishi et al.
patent: 5056074 (1991-10-01), Tateishi et al.
patent: 5179545 (1993-01-01), Tanaka et al.

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