Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Control of information signal processing channel
Reexamination Certificate
1997-06-09
2001-07-03
Hindi, Nabil (Department: 2651)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Control of information signal processing channel
C369S059200, C369S059240, C369S275300
Reexamination Certificate
active
06256276
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a recording and reproduction apparatus and method, and a disk. More particularly, the present invention relates to a recording and reproduction apparatus and method, and a disk, in which thermal stress is prevented from accumulating on a recording medium when data is repeatedly recorded on a disk.
2. Description of the Related Art
A conventional recording apparatus records data by modulating the intensity of a laser beam on the basis of data to be recorded and radiating it onto a disk, and causing a physical change in a recording medium.
In such conventional recording apparatuses, data is recorded on the basis of address information prerecorded on a disk. Therefore, when data is recorded with specific address information being specified, the area where the data is recorded is predetermined on the disk.
For example, it is known in a rewritable-type disk that, when a recording laser beam is repeatedly radiated onto the same area, thermal stress is accumulated on a recording medium. As a result, accurately recording data becomes difficult.
When data is recorded on a disk, it is necessary to record a signal for synchronization (hereinafter abbreviated as a synchronization signal) together with the data to be recorded in order to synchronize signals during reproduction. Since information (content) in such a synchronization signal is often determined according to the position (address) on the disk, a specific synchronization signal is provided for a predetermined address.
Therefore, when data is repeatedly recorded (overwritten) on a rewritable-type disk, the same synchronization signal is repeatedly written on the same portion of the disk. As a result, there is a problem in that thermal stress accumulates on that portion of the recording medium, and it becomes difficult to accurately reproduce a synchronization signal.
Accordingly, in order to solve such problems, a recording method for randomly changing the recording start point of recording data is disclosed in Japanese Patent Publication No. 8-10489. However, such a method has problems in that since data recorded on a disk is noncontinuous, it is difficult to provide recording timing during recording.
SUMMARY OF THE INVENTION
The present invention has been achieved in view of such circumstances. The present invention makes it possible to prevent thermal stress from accumulating on a recording medium even when overwriting is performed on a rewritable-type disk and to record data continuously.
The recording and reproduction apparatus of claim
1
comprises: division means for dividing data into blocks of a predetermined length; recording and reproduction unit formation means for forming a recording and reproduction unit by adding a front link area and a back link area of a predetermined length before and after the block, respectively; address detection means for detecting an address prerecorded on the rewritable-type disk; and recording means for recording the recording and reproduction unit on a predetermined area of the rewritable-type disk on the basis of an output from the address detection means.
The recording and reproduction method of claim
10
comprises: a dividing step for dividing data into blocks of a predetermined length; a recording and reproduction unit formation step for forming a recording and reproduction unit by adding a front link area of a predetermined length and a back link area of a predetermined length before and after the block, respectively; an address detection step for detecting an address prerecorded on the rewritable-type disk; and a recording step for recording the recording and reproduction unit on a predetermined area of the rewritable-type disk on the basis of the address detected in the address detection step.
In the disk of claim
11
, a recording and reproduction unit formed in such a way that a front link area and a back link area are respectively added before and after data divided into a predetermined length is recorded thereon. The lengths of the front link area and the back link area are randomly changed so that the recording and reproduction unit has a fixed length.
In the recording and reproduction apparatus of claim
1
, the division means divides data into blocks of a predetermined length, the recording and reproduction unit formation means forms a recording and reproduction unit by respectively adding a front link area and a back link area of a predetermined length before and after the block, the address detection means detects an address prerecorded on a rewritable-type disk, and the recording means records the recording and reproduction unit on a predetermined area of the rewritable-type disk on the basis of an output from the address detection means. For example, data to be recorded is divided into blocks of a predetermined length by the division means, a front link area and a back link area are respectively added before and after the block, and a recording and reproduction unit to which the front and back link areas are added is recorded on a disk on the basis of the address detected by the address detection means.
In the recording and reproduction method of claim
10
, data is divided into blocks of a predetermined length in the division step, a recording and reproduction unit is formed by adding a front link area and a back link area of a predetermined length before and after the block, respectively, in the recording and reproduction unit formation step, the address prerecorded on a rewritable-type disk is detected in an address detection step, and the recording and reproduction unit is recorded on a predetermined area of the rewritable-type disk on the basis of an output from the address detection step in the recording step. For example, data to be recorded is divided into blocks of a predetermined length in the division step, a front link area and a back link area are added respectively before and after the block, and a recording and reproduction unit to which the front link area and the back link area are added is recorded on a disk on the basis of the address detected in the address detection step.
In the disk of claim
11
, a recording and reproduction unit formed in such a way that a front link area and a back link area are respectively added before and after data divided into a predetermined length is recorded thereon, and the recording and reproduction unit is recorded with the lengths of the front link area and the back link area randomly changed so that the recording and reproduction unit has a fixed length. For example, a recording and reproduction unit is formed in such a way that a front link area and a back link area whose lengths are randomly changed are respectively added before and after the data divided into a predetermined length, and the recording and reproduction unit is recorded.
The above and further objects, aspects and novel features of the invention will become more apparent from the following detailed description when read in connection with the accompanying drawings.
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Patent Abstracts of Japan, JP 4-153919, Published May 27, 1992, Nippon Telegraph & Telephone Corp.
Patent Abstracts o
Kobayashi Shoei
Masuda Shozo
Takeda Toru
Yamagami Tamotsu
Hindi Nabil
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sony Corporation
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