Rotary recording medium having a guide track and recording and r

Details Rotary recording medium having a guide track and recording and r Rotary recording medium having a guide track and recording and r

1990-04-25

1993-01-05

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

3692753, G11B 700, G11B 370

Patent

active

051777274

ABSTRACT:
An optical disk includes a recording surface and a guide track which is a groove formed on the recording surface, and the edge lines of the groove has a wave shape that changes cyclically in a direction of a radius. An optical disk apparatus includes a first laser, a second laser, a first and second optical sensors which detect the reflected beams obtained by reflecting the light beams from the first and second lasers on the recording surface. The optical disk also includes first and second signal extraction circuits extracting signals having a frequency component corresponding to the wave shape of the edge line of the groove from the detection signals from the first and second optical sensors, a tracking controller controlling positions in a direction of the radius of the first and second lasers on the basis of the signals from the first and second extraction circuits, and a recording and reproducing unit for recording and reproducing on and from the optical disk.

REFERENCES:
patent: 3190971 (1965-06-01), Lowell
patent: 3931460 (1976-06-01), Watson
patent: 4018448 (1977-04-01), Di Matto
patent: 4223347 (1980-09-01), Bauwhuis et al.
patent: 4392219 (1983-07-01), Yokozawa et al.
patent: 4712204 (1987-12-01), Takemura et al.
patent: 4870508 (1989-09-01), Van Rosmalen et al.
patent: 5023856 (1991-06-01), Raaymakers et al.
"Optical Disc Technology" (Ogami et al., Feb. 10, 1989 Rajio Gijutsusha Inc., pp. 85-97) discloses various procedures for detecting tracking error.

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