EP0831468A2
Expired / Lapsed
EP
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Method of and apparatus for recording data on land/groove track on optical recording medium
Assignee: Sony Corp
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Filing: 1997-09-24
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Granted: —
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Expires: 2017-09-24
Abstract
Abstract An optical recording method according to the invention aims, that when an optical pickup (2) is moved over an optical disk (1), the optical pickup (2) being positioned onto the target track location, record marks (41; 61; 62) being recorded on the optical disk (1) by a light beam irradiated onto the optical disk (1) through the optical pickup (2), then an irradiation position of the light beam is offset during recording by a predetermined amount to a track at the recording direction side relative to the target track location, a record mark (41; 61; 62) is formed on a target track by the offset light beam.
Inventors
- 👤 Toru Takeda
- 👤 Akira Shimazu
- 👤 Tamotsu Yamagami
- 👤 Tadaaki Nomoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 23:35
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/0045; G11B7/00454; G11B19/00; G11B19/02; G11B19/12; G11B7/007; G11B7/00718; G11B7/08; G11B7/085; G11B7/09; G11B7/0901; G11B7/094; G11B7/12; G11B7/125; G11B7/126; G11B7/1263; G11B7/127; G11B7/24; G11B7/2407; G11B7/24073; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2537; G11B2220/2562; G11B7/0055; G11B7/00557
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
102 words
An optical recording method of moving an optical pickup (2) over a
recording medium (1) to position said optical pickup (2) onto a target track, and forming a
record mark (41; 61; 62) on the recording medium (1) by a light beam irradiated onto the
optical disk (1) from the optical pickup (2), comprising the steps of: offsetting an irradiation position of said light beam on said recording
medium (1) by a predetermined length relative to said target track in the direction of the
recording; and forming a record mark (41; 61; 62) on said target track by said offset light
beam.
Claim 2
Dependent Claim
101 words
An optical recording method according to claim 1, wherein said
recording medium (1) comprises a track formed of a groove portion (G) which has a spiral
groove formed on its recording surface and a land portion (L) which is sandwiched
between the groove portions, and wherein in said offsetting step, when said record marks
(41; 61; 62) are to be recorded on said groove portion (G), an irradiation position of said
light beam is offset by the predetermined distance relative to a track center of said groove
portion (G) toward an adjacent land portion (L) in the direction of the recording.
Claim 3
Dependent Claim
180 words
An optical recording method according to claim 1, wherein said
recording medium (1) comprises a track formed of a groove portion (G) which has a spiral
groove formed on its recording surface and a land portion (L) which is sandwiched
between the groove portions (G), wherein in said offsetting step, when a record mark (41;
61; 62) is to be newly formed by overwriting on said groove portion (G) adjacent to the
land portion (L) on which the record mark (41; 61; 62) is already formed in the direction
of the recording, an irradiation position of said the light beam is offset by the
predetermined distance relative to a track center of said groove portion (G) toward an
adjacent land portion (L) in the direction of the recording, and wherein in said forming
step, a record mark (41; 61; 62) is formed on said groove portion (G) and a land portion
(L) adjacent to the groove portion (G) in the direction of recording while a record mark
(41; 61; 62) already formed on the groove portion (G) is being erased.
Claim 4
Dependent Claim
172 words
An optical recording method according to claim 1, wherein said
recording medium comprises a track formed of a groove portion (G) which has a spiral
groove formed on its recording surface and a land portion (L) which is sandwiched
between the groove portions (G), wherein in said offsetting step, when a record mark (41;
61; 62) is to be formed on said groove portion (G), an irradiation position of said the light
beam is offset by the predetermined distance relative to a track center of said groove
portion (G) toward an adjacent land portion (L) in the direction of the recording, and
wherein in said forming step, a recording thin film on said recording medium (1) is heated
by said light beam irradiation for raising its temperature, thereby making a crystalline
phase change to be caused in said recording thin film, and said record mark (41; 61; 62) is
formed on said groove porion (G) and a land portion (L) adjacent to said groove portion
(G) in the direction of the recording.
Claim 5
Dependent Claim
209 words
An optical recording method according to claim 1, wherein said
recording medium (1) comprises a track formed of a groove portion (G) which has a spiral
groove formed on its recording surface and a land portion (L) which is sandwiched
between the groove portions (G), wherein in said offsetting step, when a record mark (41;
61; 62) is to be newly formed by overwriting said groove portion (G) adjacent to the land
portion (L) on which the record mark (41; 61; 62) is already formed in the direction of the
recording, an irradiation position of said the light beam is offset by the predetermined
distance relative to a track center of said groove portion (G) toward an adjacent land
portion (L) in the direction of the recording, and wherein in said forming step, a recording
thin film on said recording medium is heated by said light beam irradiation for raising its
temperature, thereby making a crystalline phase change to be caused in said recording thin
film, and a record mark (41; 61, 62) is formed on said groove portion (G) and a land
portion (L) adjacent to the groove portion (G) in the direction of recording while the
record mark already formed on the groove portion is being erased.
Claim 6
Independent Claim
161 words
An apparatus for recording data on an optical disk (1) having a track
formed of a groove portion (G) and a land portion (L) which are alternately disposed in
the radius direction, comprising: an optical pickup (2) for irradiating a light beam on a recording surface of
said optical disk (1) so that a light spot larger than both widths of said groove portion (G)
and said land portion (L) should be formed thereon; tracking means (12) for controlling a position of said light spot relative to
said track; tracking setting means (20) for controlling said tracking means (12) so that
a center of said light spot should be located at a position offset by a predetermined amount
relative to track centers of said groove portion (G) and said land portion (L); and output controlling means for forming a record mark (41; 61; 62) on the
recording surface of said optical disk (1) by controlling a power of said light beam.
Claim 7
Dependent Claim
51 words
An apparatus according to claim 6, wherein said tracking setting means
(20) controls said tracking means (12) so that a circumference portion of said light spot
should be located substantially at an edge portion, on an opposite side in the recording
direction, of a track where data is to be recorded.
Claim 8
Dependent Claim
89 words
An apparatus according to claim 6 or 7, wherein said tracking means
(12) carries out respective tracking operations depending upon whether a track where said
light beam is irradiated is a groove portion (G) or a land portion (L), and said tracking
setting means (20) supplies a signal having either of polarities which are different from
each other depending upon whether a track where said light beam is irradiated is a groove
portion (G) or a land portion (L), as a tracking setting value to said tracking means (12).
Claim 9
Independent Claim
60 words
An apparatus according to one of claims 6 to 8, wherein when a record
mark (41; 61; 62)formed on said track is read, said tracking setting means (20) controls
said tracking means (12) so that a spot of said light spot should be located at each of a
track center of said groove portion (G) and said land portion (L).
Claim 10
Independent Claim
86 words
An apparatus according to one of claims 6 to 8, wherein said output
controlling means, when a record mark (41; 61; 62) is formed on either of said groove
portion (G) and said land portion (L), erases a part of said record mark (41) formed on the
other of said groove portion (G) and said land portion (L) adjacent thereto in the recording
direction, and simultaneously forms a new record mark (41; 61; 62) on the other of said
groove portion (G) and land portion (L).
Claim 11
Dependent Claim
22 words
An apparatus according to claim 10, wherein a phase-change recording
film is formed on the recording surface of said optical disk (1).
References Cited (Backward Citations)
No citation records indexed.
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