Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
1999-08-13
2002-04-16
Edun, Muhammad (Department: 2651)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S047100, C369S053100, C369S275100
Reexamination Certificate
active
06373805
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a method and an apparatus for recording an information on an optical recording medium having land and groove tracks.
2. Description of the Related Art
Nowadays, a need of larger capacity has been increased in an optical recording/reproducing field or an opto-magnetic recording/reproducing field in order to record an information that is greatly enlarged in the quantity. Accordingly, in optical discs such as a DVD-RAM (digital versatile disc-random access memory) and so on, there has been suggested so-called a land/groove recording system having an information recorded on both of land and groove tracks. Actually, a disc of a phase-change recording system such as DVD-RAM and a disc of an opto-magnetic recording system such as ASMO (Advanced Storage Magneto-Optical) are known as the disc of land/groove recording system.
Referring to
FIGS. 1 and 2
, there are shown an optical recording medium
20
having land tracks
22
and groove tracks
24
. The optical recording medium
20
consists of an information recording and reproducing layer
26
, a reflective layer
28
and a protective layer
32
formed sequentially under a substrate
30
. The information recording and reproducing layer
26
records an information and the reflective layer
28
reflects a light beam. The substrate
30
and the protective layer
32
are formed by a material hating relatively low heat conductivity. For example, PMMA (Poly Methyl MethAcrylate) can be used as the substrate material and the protective layer
32
can be formed by a resin class. Meanwhile, the information recording and reproducing layer
26
and the reflective layer
28
are formed by the material having a relatively high heat conductivity. The information recording and reproducing layer
26
can consist of a recording layer
26
a
, a reproduction supporting layer
26
b
and a reproducing layer
26
c
, as shown in FIG.
3
. The recording layer
26
a
and the reproduction supporting layer
26
b
are formed by a TbFeCo and a GdFe, respectively. The reproducing layer
26
c
and the reflective layer
28
are made of a GdFeCo and a Al, respectively.
In such an optical recording medium as described above, the information recording and reproducing layer
26
positioned at the land track
22
lies adjacent to the materials having the high heat conductivity. Meanwhile, the information recording and reproducing layer
26
positioned at the groove track
24
is contiguous to the materials having a low heat conductivity. Accordingly, the land and groove tracks
22
and
24
have a different thermal conductivity when a light beam is irradiated on the optical recording medium
20
. As a result, a thermal characteristic difference appears between the land and groove tracks
22
and
24
.
The thermal characteristic difference allows recording pits formed on the land and groove tracks
22
and
24
to have a different length although the light beam of the same recording power is irradiated on the optical recording medium with the land and groove tracks
22
and
24
. In detail, the material on the areas adjacent to the land track
22
radiates a great amount of thermal energies when the light beam is irradiated on the land track
22
. This results from that the material on the area adjacent to the land track
22
has the high heat conductivity. Thus, a relatively short recording pits are formed on the information recording and reproducing layer
26
corresponding to the land track
22
. Meanwhile, the material on the areas adjacent to the groove track
24
radiates a small amount of thermal energies when the light beam is irradiated on the groove track
24
. This results from that the material on the area adjacent to the groove track
24
has the low heat conductivity. Therefore, a relatively long recording pits are formed on the information recording and reproducing layer
26
corresponding to the land track
24
. In other words, although the light beam having the same recording power is irradiated on the land and groove tracks
22
and
24
, the recording pits formed on the land and groove tracks
22
and
24
have a different length according to the widths of the land and groove tracks
22
and
24
and the depth from the land track
22
to the groove track
24
. Due to this, recording errors can be generated when the information is recorded on the optical recording medium.
Further, the recording errors can increase more and more as the capacity of the opical recording mdeium is enlarged. This results from the tact that the difference between the recording pits on the land and groove tracks
22
and
24
is enlarged in accordance with decreasing of the land and groove tracks
22
and
24
in width.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an optical information recording method and an apparatus that can form recording marks having the same length on a land and a groove track of an optical recording medium.
In order to achieve these and other objects of the invention, an optical information recording method according to an aspect of the present invention includes the steps of: identifying whether any one of a land and a groove track on an optical recording medium is accessed; and establishing differently an outputting manner of recording lights to be irradiated on the optical recording medium on the basis of a identifying resultant for the land and groove tracks.
An optical information recording method according to another aspect of the present invention allows a rotating speed of optical recording medium to be different depending on a land/groove identification signal for indicating a land and a groove track on the optical recording medium.
An optical information recording apparatus according to still another aspect of the present invention includes: distinguishing means for identifying whether any one of a land and a groove track is accessed; and recording means for establishing differently an outputting manner of recording lights to be irradiated on the optical recording medium on the basis of an identifying resultant of the distinguishing means and for performing a recording operation.
REFERENCES:
patent: 5335214 (1994-08-01), Motoba et al.
patent: 5870353 (1999-02-01), Morimoto et al.
Birch & Stewart Kolasch & Birch, LLP
Edun Muhammad
LG Electronics Inc.
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