A super-resolution optical head with signal corrective circuit

Details A super-resolution optical head with signal corrective circuit A super-resolution optical head with signal corrective circuit

1996-04-01

1997-11-18

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369 118, G11B 700

Patent

active

056894937

ABSTRACT:
An optical disk device is provided which can remove errors derived from the influence of side lobe components in read-out signals from a superresolution optical head, thereby reducing the information reading error. The optical disk device comprises: a superresolution optical head; and a signal corrective circuit for correcting read-out signals from the superresolution optical head, wherein the signal corrective circuit comprises a sign reversal detecting circuit for detecting information on sign reversal of the read-out signals, a singular point signal detecting section for detecting read-out signals, a predetermined period of time before the sign reversal and a predetermined period of time after the sign reversal, as singular point signals, and a read-out signal correction output section for outputting corrected read-out signals provided by multiplying the detected singular point signals by a predetermined coefficient and adding the read-out signals to signals obtained respectively by, with the sign reversal point as the center, replacing the signal before the sign reversal with the signal after sign reversal and replacing the signal after the sign reversal with the signal before the sign reversal.

REFERENCES:
patent: 5610895 (1997-03-01), Izumi et al.

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