Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-10-25
1998-03-31
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4426, 369 4429, 369 50, 369 54, G11B 7095
Patent
active
057346348
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a recording method and a recording equipment of an optical disc, and a reproducing method and a reproducing equipment of an optical disc, in particular relates to a method or the like which records data (information) on both tracks of an optical disc having a concave track and a convex track and reproduces the data from both the tracks.
BACKGROUND ART
For example, in an optical disc, such as a compact disc for reproducing, a recordable and reproducible magneto-optical disc, a phase change disc and the like, in which a guide ditch (groove) is provided in advance, up to now, data (information) is recorded on any one of a land or a groove.
By the way, in order to make a recording density of an optical disc higher or to make its capacity larger, a numerical aperture of an objective lens of a so-called optical pick-up is made large, a wave length of laser light is made short, and simultaneously a track pitch is made small. However, if making the numerical aperture larger, this results in a problem that the optical pick-up becomes larger as well as heavier. Further, there is a limit in developing a laser diode having a short wave length.
Then, in recent years, a method has been researched in which both of a land and a groove are defined as a recording track (hereafter, referred to as a concave track and a convex track) and data is recorded on these tracks. However, a concrete and actual method is not proposed which records data on a concave track and a convex track and then reproduces the data therefrom.
The present invention is proposed in view of such circumstances. It is therefore an object of the present invention to provide a recording method and a recording equipment of an optical disc, and a reproducing method and a reproducing equipment of an optical disc, which can record data on both of a concave track and a convex track of an optical disc having a guide ditch, and reproduce the data from both the concave track and the convex track of the optical disc.
DISCLOSURE OF THE INVENTION
In a recording method of an optical disc in accordance with the present invention, an optical disc having a concave track and a convex track is rotated and driven at a faster speed than a rotation speed corresponding to a speed of inputted data. It radiates laser light to the optical disc, detects a tracking error signal based on a concave and convex form of the track by means of its reflection light, and applies a tracking servo so as to selectively follow any one track of the concave track or the convex track of a spot of the laser light by using this tracking error signal. It stores the inputted data in a memory, reads out the data from the memory, and records on the track to which the tracking servo is applied. And, it reverses a polarity of the tracking error signal when carrying out a track jump from a track, on which current data is recorded, to an adjacent track, applies the tracking servo to a new track, reads out the data from the memory, and records the data on the new track.
In a reproducing method of an optical disc in accordance with the present invention, an optical disc having a concave track and a convex track is rotated and driven at a faster speed than a rotation speed corresponding to a sending speed of reproduced data. It radiates laser light to the optical disc, detects a tracking error signal based on a concave and convex form of the track by means of its reflection light, and applies a tracking servo so as to selectively follow any one track of the concave track or the convex track of a spot of the laser light by using the tracking error signal. It reproduces data from the track to which the tracking servo is applied and stores the reproduced data in a memory, and then reads out the data at the sending speed and outputs as the reproduced data. It reverses a polarity of the tracking error signal when carrying out a track jump from a track, on which current data is reproduced, to an adjacent track, and applies the tracking servo to a new track, repro
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Narahara Tatsuya
Ono Masumi
Kananen Ronald P.
Sony Corporation
Tran Thang V.
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