KR900018988A - Defect inspection device of disc information recording medium - Google Patents

Abstract

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Description

Defect inspection device of disc information recording medium

1 is a block diagram showing a circuit configuration of a defect inspection apparatus for a disc shaped information recording medium according to an embodiment of the present invention.

2 is a block diagram showing a circuit configuration of a defect inspection apparatus of a disc shaped information recording medium according to another embodiment of the present invention.

FIG. 3 is a schematic diagram showing defect data obtained by the apparatus of FIG. 2 of the present invention. FIG.

Claims (10)

In a defect inspection apparatus of a disc information recording medium provided with a defect detection circuit (3) for detecting a signal resulting from a defect contained in a reproduced signal in a disc information recording medium in which a signal is recorded in a spiral or concentric circle as a drop out pulse. A length counter 5 for detecting the length of the drop out pulse output from the defect detection circuit 3, a track counter 6 for detecting a signal reproduction position in the radial direction of the disc-shaped information recording medium, and the disc information An angle counter (7) for detecting a signal reproducing position in the circumferential direction of the recording medium, means for detecting the continuity of the track on which a dropout pulse is detected in accordance with the detection result of each counter, and a drop-au reproduced on the same track Means for detecting the continuity of pulses and agglomerates present on the disc-shaped information recording medium according to the detection results of both means. Provided with a means for detecting the sum disk-like information recording medium of the defect inspection system. The defect inspection apparatus according to claim 1, further comprising a storage means (8) for storing the respective detection results. The reproduction signal according to claim 1, wherein the current reproduction signal is recorded in accordance with the rotation pulse 11 applied by the reproduction device 2 when reproducing the disc-shaped information recording medium whose address is not recorded in the track. A defect inspection apparatus of a disc shaped information recording medium for detecting a track position. A defect inspection apparatus of a disc shaped information recording medium for inspecting defects and errors of a disc shaped information recording medium having a plurality of information recording areas consisting of a spiral or concentric circular track, wherein each defect of each information recording area in the reproduction signal is defective. And a defect detection unit (14, 15, 16) for detecting an error, means (17) for detecting the type of the detected defect and error, means (17) for detecting the type of the detected defect and error, and the detected Means 18 for detecting the magnitude of defects and errors, means 19 for detecting the track position where the detected defects and errors exist, and a circumferential position of the disc-shaped information recording medium in which the detected defects and errors exist. Means for detecting 20, a storage means 8 for storing the detection results of the respective means, and defects and errors on the disc-shaped information recording medium in accordance with the storage contents of the storage means. Disk-like information recording medium of the defect inspection apparatus provided with an end. 5. The disk information according to claim 4, wherein the defect detection unit comprises a user area defect detection unit 14, a control track area data error detection unit 15, and a header error detection unit 16 for generating an address decode gain signal. Equipment for defect inspection of recording media. 5. A defect inspection apparatus according to claim 4, wherein the defect data consists of 48 bits. 7. The defect inspection apparatus according to claim 6, wherein the defect data are each composed of 16 bits of size data, angular sector data, and track data. Means (23, 25, 16) for detecting a defect with a reproduction signal in a disc shaped information recording medium, means (17) for detecting the type of detected defect, for detecting the radial position and the circumferential position of the detected defect. Means, means for dividing the defect into defect masses according to the detected position, means for calculating the radial and circumferential dimensions of the combined mass, means for storing the type, position and dimension of the detected defect or mass of defects 8 Defect inspection device of the disc-shaped information recording medium prepared. The counter according to claim 8, wherein the means for detecting a defect with the reproduction signal includes a drop out pulse generating circuit 23a for generating a drop out pulse and a counter for counting the length of each drop out pulse as a clock number. A defect inspection apparatus for a disc shaped information recording medium having a 23b. The defect inspection apparatus according to claim 8, further comprising an A / D converter (24) for converting an analog signal, which is a reproduction signal in the reproduction device (2), into a digital signal. ※ Note: The disclosure is based on the initial application.