Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
1999-04-23
2001-11-20
Tran, Thang V. (Department: 2651)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S053310, C369S053370, C369S047300, C369S047330, C369S047540
Reexamination Certificate
active
06320833
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus for, and a method of, recording data to a disc having formed thereon alternately a track of which both walls are wobbled at a predetermined frequency and a track of which both walls are flat, and an apparatus for, and a method of, reproducing data recorded on the disc.
2. Description of Related Art
Optical discs in which program data, video data, audio data or the like is recorded are represented by compact discs (CD), for example.
Recently, it is expected that a medium appears into which the user can record a program data, video data, audio data, etc.
Currently, a mini disc (MD) is known to which a compressed audio signal can be recorded. The MD has a recording capacity as small as 140 MB and so it is suitably usable for recording audio data. However, this recording capacity is insufficient for recording video data and computer data.
In these situations, an magneto-optical disc has newly been proposed which has a recording capacity of 640 MB. This new disc is called “MD-DATA2” disc.
In the conventional MD, grooves wobbled at a frequency of 22.05 kHz are pre-formed on the disc and an address information is recorded as modulated at 22.05 kHz.
In the newly proposed MD-DATA2 to which the present invention is applied, a wobbled groove and non-wobbled groove are formed alternately as shown in FIG.
1
and data is recorded on a land between the wobbled and non-wobbled grooves.
As shown in
FIG. 2
, there are formed on the MD-DATA2 disc a first land TrA of which one lateral face is wobbled at a predetermined frequency while the other lateral face is flat and a second land TrB of which one lateral face is flat while the other lateral face is wobbled at a predetermined frequency.
Namely, there has not ever been proposed any MD in which data is recorded on two tracks having different physical properties.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a recording apparatus and method, and a reproducing apparatus and method, in which during write of data on two tracks different in physical properties from each other, a time of switching between the two tracks in pair is controlled.
The above object can be attained by providing a recording method in which data is written to a disc having formed thereon a pair of concentrical or spiral tracks adjacent to each other and to which a common address is given, comprising, according to the present invention, the steps of:
writing a data blocked to a predetermined length to one of the pair of tracks;
accessing the other track having the common address after the write of the data blocked to the predetermined length to the one track; and
writing a data blocked to a new predetermined length to the other one of the pair of tracks after the access to that track.
Also, the above object can be attained by providing a recording apparatus adapted to write data to a disc having formed thereon a pair of concentrical or spiral tracks adjacent to each other and to which a common address is given, comprising, according to the present invention:
means for blocking an input data to a predetermined length;
means for writing the blocked data to the disc; and
means for controlling the recording means to access one of the pair of tracks and write the blocked data to the track, and then access the other one of the pair of tracks that has the common address after the write to the one track and write a data blocked to a new predetermined length to the other track.
The above object can be attained also by providing a recording apparatus adapted to write data to a disc having formed thereon a pair of concentrical or spiral tracks adjacent to each other and to which a common address is given, comprising, according to the present invention:
a memory means for storing an input data once at a first transfer rate;
a memory controlling means for detecting when the data amount stored in the memory means has exceeded a first predetermined value, reading out data from the memory means at a second transfer rate higher than the first transfer rate and stopping the data read-out from the memory means when the data amount stored in the memory means has reached a second predetermined value smaller than the first predetermined value;
a writing means for writing data read out from the memory means;
a recording means movement controlling means for moving, while the data read-out from the memory means is being stopped, the writing means from one of the pair of tracks to which the data read out from the memory means has been written to the other one of the pair of tracks; and
a writing means controlling means for stopping the writing means from writing while the data read-out from the memory means is being stopped.
Further, the above object can be attained by providing a reproducing apparatus adapted to read data from a disc having formed thereon a pair of concentrical or spiral tracks adjacent to each other and to which a common address is given, comprising, according to the present invention:
means for reading data from the disc;
a memory means for storing the data read out from the memory means once at a first transfer rate;
a memory controlling means for detecting when the data amount stored in the memory means has exceeded a first predetermined value, reading out data from the memory means at a second transfer rate higher than the first transfer rate and stopping the data storage into the memory means when the data amount stored in the memory means has reached a second predetermined value smaller than the first predetermined value; and
a writing means movement controlling means for moving, while the data storage into the memory means is being stopped, the reading means from one of the pair of tracks from which the data has been read to the other one of the pair of tracks.
These objects and other objects, features and advantages of the present intention will become more apparent from the following detailed description of the preferred embodiments of the present invention when taken in conjunction with the accompanying drawings.
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Nonaka Chiaki
Ohbi Seiji
Shigenobu Masahiro
Yamada Makoto
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sony Corporation
Tran Thang V.
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