Defect detection apparatus for detecting defects on a recording

Details Defect detection apparatus for detecting defects on a recording Defect detection apparatus for detecting defects on a recording

1998-06-11

2000-07-04

Huber, Paul W.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 58, 36912414, G11B 700

Patent

active

060848367

ABSTRACT:
A defect detection apparatus has a simple constitution and performs accurate defect detection while clearly differentiating between defect detection and tracking error detection. The defect detection apparatus includes a photodetector having a light-receiving area for receiving a return light beam from a recording medium irradiated with a light beam. A defect on the recording medium is detected based on an output from the photodetector. The defect detection apparatus according to the present invention comprises signal generation means for generating on the basis of an output from the photodetector at least two phase detection signals having phases which vary in a manner complementary to each other according to a deviation of the light beam from a track of the recording medium, adding means for adding up absolute value of the phase detection signal to generate a sum total signal having a value corresponding to a result of the addition, and discrimination means for comparing the value of the sum total signal with a predetermined reference value so as to generate a defect detection signal based on a result of the comparison.

REFERENCES:
patent: 5088080 (1992-02-01), Ishibashi et al.
patent: 5204848 (1993-04-01), Cardero et al.
patent: 5777967 (1998-07-01), Ishibashi et al.

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