Method for detecting tracking error in optical disk system and i

Details Method for detecting tracking error in optical disk system and i Method for detecting tracking error in optical disk system and i

1992-02-06

1993-06-29

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, G11B 709

Patent

active

052240827

ABSTRACT:
A method for detecting a tracking error in a process of tracking a groove track on a recording medium includes the steps of: irradiating a first light spot onto a groove track on a recording medium as a focused light beam for carrying out recording, reproducing, or erasing of information on the groove track of the recording medium; and irradiating a second and a third light spots onto an area around the groove track on the recording medium as focused light beams simultaneously with the irradiation of the first light spot, the second and third light spots are irradiated onto an area around the groove track on one side of the first light spot in a manner such that each of the second and third light spots covers both an inside and outside of the groove track.

REFERENCES:
patent: 4532522 (1985-07-01), Tsunoda et al.
patent: 4686663 (1987-08-01), Kiihn
patent: 4817072 (1989-03-01), Toide et al.
patent: 4993011 (1991-02-01), Torazawa et al.
patent: 5018127 (1991-05-01), Ando
patent: 5033040 (1991-07-01), Fujita
patent: 5070488 (1991-12-01), Fukushima et al.

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