Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1997-02-07
1998-11-24
Dinh, Tan
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
G11B 1722
Patent
active
058417397
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a disc apparatus and a disc access method for accessing a disc-shaped recording medium including the reproduction (playback) only area and the recordable/reproducible area.
BACKGROUND ART
Hitherto, as the disc-shaped recording medium, reproduction (playback) only disc such as digital audio disc including the reproduction (playback) only area in which data are recorded by pits, etc., recording/reproduction disc including the recordable area for data by the magnetic recording film or the magneto-optical recording film, hybrid disc including the reproduction only area in which data are recorded by pits and the recordable area for data by the magneto-optical recording film, and the like are known.
In the hybrid disc, management information for carrying out management of data recorded in the reproduction only area is recorded in the reproduction only area to carry out management of data in the reproduction only area on the basis of the management information reproduced from the reproduction only area. Moreover, management information for carrying out management of data recorded in the recordable area is recorded in the recordable area to carry out management of data recorded in the recordable area on the basis of the management information reproduced from the recordable area.
For example, in the optical disc, there is a hybrid type optical disc in which the information recording surface is divided so that the reproduction only area and the recordable/reproducible area are formed. The optical disc apparatus to which such hybrid type optical disc is applied is adapted so that desired data can be reproduced by the reproduction systems corresponding to respective areas, and desired data can be recorded by the recording/reproduction system corresponding to the recordable area.
Namely, in this hybrid type optical disc, the area of the inner circumferential side is allocated (assigned) to the reproduction only area, and predetermined data are recorded in advance in this area by pits similar to those of the digital audio disc. On the contrary, the area of the outer circumferential side is allocated (assigned) to the recordable/reproducible area, and the perpendicular magnetization film is formed therein.
Thus, in the optical disc apparatuses of this kind, processing of recording/reproduction is executed in the reproduction only area and the recordable/reproducible area by technique similar to those employed in the digital audio disc player and the magneto-optical disc apparatus.
Moreover, in the case of carrying out seek operation across the reproduction only area and the recordable/reproducible area, the optical disc apparatuses of this kind are adapted to detect position of the optical pick-up by the position detecting sensor disposed in the movable (moving) direction of the optical pick-up, or to detect position of the optical pick-up by the number of drive pulses of the stepping motor for allowing the optical pick-up to undergo seek operation, thus to allow the optical pick-up to undergo seek operation (positioning onto a designated track).
Thus, in the optical disc apparatuses of this kind, switching of the entire operation is carried out in correspondence with two areas of which reproduction systems are different, thus making it possible to carry out recording/reproduction of desired data.
Meanwhile, if the position detecting sensor of the optical pick-up can be omitted in the optical disc apparatuses of this kind, the entire configuration can be simplified accordingly. Further, at this time, if the optical pick-up is caused to undergo seek operation by the d.c. motor in place of the stepping motor, the entire configuration can be simplified to still more degree.
However, in the conventional optical disc apparatuses, in the case where the position detecting sensor is omitted and the optical pick-up is caused to undergo seek operation by the d.c. motor as stated above, it becomes difficult to directly detect position of the optical pick-up during seek operation.
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Iida Michihiko
Nakamura Masanobu
Watanabe Kazuhiro
Dinh Tan
Sony Corporation
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