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US5239531A
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Optical information recording method using modulated optical beam
Assignee: Ricoh Co Ltd
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Filing: 1991-06-11
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Granted: 1993-08-24
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Expires: 2011-06-11
Abstract
Abstract An optical information recording method for recording one of signals "1" and "0" in each of bit positions alloted at regular intervals along a track of a recording medium. The method comprises the step of enhancing energy for recording a bit of "1" which is directly subsequent to a bit of "0" in comparison to energy for recording a bit of "1" which is directly subsequent to a bit of "1".
Inventors
- 👤 Michiharu Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:17
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/0045
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
153 words
An optical information recording method for recording bits of "1" and "0" in bit positions allotted at a regular interval along a track of a recording medium by forming optical marks along said track with an optical beam, a bit position formed with an optical mark corresponding to said bit of "1", a bit position formed with no optical mark corresponding to said bit "0", said method for recording said bits of "1" and "0" comprising the steps of: modulating an optical beam according to the bits desired to be recorded and irradiating said modulated optical beam on said bit positions along said track, wherein the energy of said modulated optical beam is greater when recording a bit of "1" at a bit position which is directly subsequent to a bit of "0" than when recording a bit of "1" at a bit position which is directly subsequent to a bit of "1".
Claim 2
Dependent Claim
153 words
An optical information recording method for recording bits of "1" and "0" in bit positions allotted at a regular interval along a track of a recording medium by forming optical marks along said track with an optical beam, a bit position formed with an optical mark corresponding to said bit of "1", a bit position formed with no optical mark corresponding to said bit "0", said method for recording said bits of "1" and "0" comprising the steps of: modulating an optical beam according to the bits desired to be recorded and irradiating said modulated optical beam on said bit positions along said track, wherein the energy of said modulated optical beam is greater when recording a bit of "1" at a bit position which is directly subsequent to a bit of "0" than when recording a bit of "1" at a bit position which is directly subsequent to a bit of "1".
Claim 3
Dependent Claim
33 words
An optical information recording method according to claim 1, wherein said modulating and irradiating comprises applying an optical pulse at said bit position on the recording medium to form a bit of "1".
Claim 4
Dependent Claim
57 words
An optical information recording method according to claim 2, wherein modulating and irradiating comprises making said pulse wider when recording said bit of "1" at a bit position which is directly subsequent to the bit of "0" than when recording a bit of "1" at a bit position which is directly subsequent to a bit of "1".
Claim 5
Dependent Claim
60 words
An optical information recording method according to claim 2, wherein said modulating and irradiating comprises making said pulse higher in amplitude when recording said bit of "1" at a bit position which is directly subsequent to the bit of "0" than when recording a bit of "1" at a bit position which is directly subsequent to a bit of "1".
Claim 6
Dependent Claim
52 words
An optical information recording method according to claim 2, wherein said modulating and irradiating comprises making the width of said pulse for recording the bit of "1" at a bit position which is directly subsequent to the bit of "1" narrower than said regular interval at which said bit positions are allotted.
Claim 7
Dependent Claim
44 words
An optical information recording method according to claim 2, wherein said modulating and irradiating further comprises applying a pulse, which is weaker than a threshold level for recording a mark, at a bit position on the recording medium when recording a bit of "0".
Claim 8
Dependent Claim
80 words
An optical information recording method according to claim 1, wherein said modulating comprises making the energy of said modulated optical beam when recording a bit of "1" at a bit position which is directly subsequent to a bit of "0" equal to E o (1+k) in which E o is the energy of said modulated optical beam when recording a bit of "1" which is directly subsequent to the bit of "1" and the k value is represented by 0.05≦k≦0.70.
Claim 9
Dependent Claim
47 words
An optical information recording method according to claim 3, wherein the width of said pulse for recording the bit of "1" at a bit position which is directly subsequent to the bit of "1" is narrower than said regular interval at which said bit positions are allotted.
Claim 10
Dependent Claim
47 words
An optical information recording method according to claim 4, wherein the width of said pulse for recording the bit of "1" at a bit position which is directly subsequent to the bit of "1" is narrower than said regular interval at which said bit positions are allotted.
Claim 11
Dependent Claim
43 words
An optical information recording method according to claim 3, wherein said modulating and irradiating comprises applying a pulse, which is weaker than a threshold level for recording a mark, at a bit position on the recording medium when recording a bit of "0".
Claim 12
Dependent Claim
43 words
An optical information recording method according to claim 4, wherein said modulating and irradiating comprises applying a pulse, which is weaker than a threshold level for recording a mark, at a bit position on the recording medium when recording a bit of "0".
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |