JPH05144186A - Flat planar information recording medium and recording method on flat planar information recording medium - Google Patents

Abstract

PURPOSE:To provided an optical memory which can decrease the deterioration of a medium, etc., by thermal impact. CONSTITUTION:An optical memory which has plural tracks having certain spacings and with which the distance between the top position or therminal position of an ID region processed by the arbitrary track among these tracks and the top position or therminal position of the ID region possessed by the track adjacent thereto is set at >=3 times the spacing between the centers of the two tracks is constituted. As a result, the recording start positions and the recording terminal positions do not spacially concentrate any more and, therefore, the thermal impact at the time of recording is dispersed and the degradation of the medium and substrate is decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat information recording medium and its recording method.

[0002]

2. Description of the Related Art A flat information recording medium, especially an optical memory,
Generally, it is performed by irradiating a focused light beam on a recording medium while scanning it. An optical disk scans a light beam spirally on a recording medium, and an optical card or the like scans linearly like a CRT display.

A conventional optical memory will be described below with reference to the drawings. FIG. 2 is a schematic diagram of a region where recording is performed in the optical memory. An ID area 2 in which a signal indicating a recording position and the like are recorded, and a recording area 3 in which information is recorded, on a track 1 arranged periodically at a predetermined interval.
Exists. The ID area 2 is necessary for managing a large amount of information, and for this reason, the recording area 3 for recording data is not continuous but is intermittently divided into areas of a predetermined size. In the ID area 2, there are those in which recording position information is written in advance due to the uneven shape of the medium, and those in which recording position information is written at the time of formatting.

Generally, in an optical memory, a recording medium is formed in the ID area 2 as in the case of the recording information 3. Therefore, if a large amount of light is applied to this area, the ID information may be destroyed. Therefore, when the light beam irradiates the ID area at the time of recording and the positional information is read by reference, the light amount is reduced to be read.

As a result, the heat distribution in the vicinity of the recording start position, that is, the position where the reproduction light amount is increased to the peak light amount and the recording end position, that is, the position where the reproduction light amount is decreased, suddenly changes, and the medium is thermally shocked. Is added.

[0006]

In the conventional optical memory,
In adjacent tracks, the ID areas are also adjacent at the same position, and therefore, the position where the thermal shock is applied is also adjacent. Then, this position is easily affected by not only the thermal shock of the track itself at the time of recording but also the thermal shock of the adjacent track at the time of recording, thus distorting the medium and the substrate supporting it.

The present invention solves the above problems, and an object of the present invention is to provide an information record carrier capable of reducing deterioration of a medium or the like due to thermal shock.

[0008]

In order to achieve the above object, the present invention has a plurality of tracks having a certain interval, and the tracks have an area (ID area) for discriminating a recording area. Flat information in which the distance between the start position or end position of the ID area of a certain track and the start position or end position of the ID area of an adjacent track is three times or more the interval between the centers of both tracks. Record carrier.

[0009]

According to the present invention, since the head position and the end position of the ID areas of the adjacent tracks are not adjacent to each other by the above configuration, the start position and the end position of the recording area, that is, the position to which the thermal shock is applied are adjacent to each other. Is eliminated, and as a result, deterioration of the medium or the like can be prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A flat information record carrier according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of a region where recording is performed in an optical memory according to an embodiment of the present invention. An ID area 2 in which a signal indicating a recording position and the like are recorded and a recording area 3 in which information is recorded are present on a track 1 which is periodically arranged at a predetermined interval. Here, the position of the ID area 2 is sequentially shifted in the adjacent tracks, and as a result, the position of the recording area 3 is also sequentially shifted while maintaining the same positional relationship.

The spread of deterioration due to thermal shock is Gaussi
Table 1 shows the results of calculating the relationship between the shift amount and the degree of thermal shock applied by the recording of the track itself and the adjacent tracks at the recording start position of a certain track as an an distribution.

[0013]

[Table 1]

Here, the track interval is 1.5 μm.
As a result, it was found that if the shift amount is 3 μm or more, the shift amount is zero, that is, the deterioration can be reduced to half or less as compared with the case of the conventional configuration. If the shift amount is 3 μm and the track interval is 1.5 μm, the distance between the recording head positions of the adjacent tracks is 3.4 μm, which is about 2.2 times the track interval. Therefore, it has been clarified that a sufficient effect can be obtained if the distance between the recording head positions of adjacent tracks is three times or more the track interval.

Since the normalized calculation result shown in Table 1 does not depend on the track interval, the present invention is similarly effective for an optical memory having a track interval other than 1.5 μm.

In the embodiment, the optical disk has been described as an example, but it can be applied to a card-shaped or tape-shaped record carrier.

[0017]

As described above, the distance between the head position or the end position of the ID area of a certain track and the head position or the end position of the ID area of the adjacent track is determined by the distance between the centers of both tracks. By making it 3 times or more, the thermal shock at the time of information recording is dispersed, and as a result, deterioration of the medium or the like can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing positions of an ID area and a recording area on a track in a flat information record carrier according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing positions of an ID area and a recording area on a track in a conventional flat information recording medium.

[Explanation of symbols]

 1 track 2 ID area 3 recording area

Claims (2)

[Claims] 1. A plurality of tracks having a certain interval,
An area (ID area) for discriminating a recording area on the track
And the start position or end position of the ID area of a certain track and the ID of an adjacent track
A flat information record carrier, characterized in that the distance from the head position or the end position of the area is three times or more the distance between the centers of both tracks. 2. A recording method for serially and intermittently recording information at a certain interval, comprising a head position or a tail position of a recording area on a line and a head position or a tail position of a recording area on an adjacent line. A recording method for a flat information record carrier, characterized in that the distance is at least three times the distance between the centers of both lines.