Method for reading information or defect out of rotating disc

Details Method for reading information or defect out of rotating disc Method for reading information or defect out of rotating disc

1982-07-26

1985-02-12

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369124, G11B 700

Patent

active

044995725

ABSTRACT:
In order to read out information recorded on a disc rotating at a constant angular velocity by means of a pick-up head movably arranged in a disc radius direction, a head position on the disc is detected to obtain a position signal representing a distance from a disc center to the pick-up head, and then a pulse signal having a frequency corresponding to the position signal thus obtained is generated. A detection signal supplied from the pick-up head and the pulse signal are supplied to an AND gate and pulses of the gated out pulse signal are counted by a counter. The number of the counted pulses represents correctly a length of the information recorded on the disc irrespective of position of the information on the disc.

REFERENCES:
patent: 2901737 (1959-08-01), Stovall, Jr.
patent: 4142210 (1979-02-01), Otobe et al.
patent: 4388713 (1983-06-01), Tatsuguchi
patent: 4425637 (1984-01-01), Tanaka et al.

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