US5825742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information recording method of optical recording medium
Assignee: Panasonic Holdings Corp
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Filing: 1997-02-11
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Granted: 1998-10-20
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Expires: 2017-02-11
Abstract
Abstract An information recording method of an optical recording medium capable of reducing the edge shift and jitter by irradiating the optical recording medium with a light beam by pulse emission in five power values, when forming recording marks and spaces of small dimensions.
Inventors
- 👤 Tsutomu Tanaka
- 👤 Tomonori Ikeya
- 👤 Akihiro Itakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:18
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/125; G11B7/126; G11B11/00; G11B11/10; G11B11/105; G11B11/10502; G11B11/10504; G11B11/10506; G11B11/1053; G11B7/004; G11B7/0045; G11B7/006; G11B7/0062
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
177 words
An information recording method of an optical recording medium for recording binary information from a series of recording marks and spaces between the recording marks, comprising the steps of: determining the length of the recording mark and the space depending on the information to be recorded so that one of the binary information corresponds to one of a front edge and a rear edge of the recording mark; and irradiating the optical recording medium with a light beam by pulse emission of the light beam, in accordance with the length of the recording mark and the space, wherein the light beam is emitted at least in five power values including a bottom power value which is the lowest edge of the pulse when forming the recording marks and the spaces between the marks such that when forming the recording mark, the light beam is emitted at least in three power values including the bottom power value, and when forming the space, the light beam is emitted in at least two power values including the bottom power value.
Claim 2
Dependent Claim
177 words
An information recording method of an optical recording medium for recording binary information from a series of recording marks and spaces between the recording marks, comprising the steps of: determining the length of the recording mark and the space depending on the information to be recorded so that one of the binary information corresponds to one of a front edge and a rear edge of the recording mark; and irradiating the optical recording medium with a light beam by pulse emission of the light beam, in accordance with the length of the recording mark and the space, wherein the light beam is emitted at least in five power values including a bottom power value which is the lowest edge of the pulse when forming the recording marks and the spaces between the marks such that when forming the recording mark, the light beam is emitted at least in three power values including the bottom power value, and when forming the space, the light beam is emitted in at least two power values including the bottom power value.
Claim 3
Dependent Claim
161 words
An information recording method of an optical recording medium for recording binary information by a series of recording marks and spaces between the recording marks, comprising the steps of: determining the length of the recording mark and the space depending on the information to be recorded so that one of the binary information corresponds to one of a front edge and a rear edge of the recording mark; and irradiating the optical recording medium with a light beam by pulse emission of the light beam, in accordance with the length of the recording mark and the space, wherein the light beam is emitted at bottom power value Pb for cooling the optical recording medium, first main heat power value Pw1, second main heat power value Pw2 and first preheat power value Paw for forming the recording mark, and second preheat power value Pae for forming the space, and the following relation holds; Pw1>Paw, Pw1>Pae, Pw1>Pb Pw2>Paw, Pw2>Pae, Pw2>Pb Paw>Pb, Pae>Pb, Paw≠Pae.
Claim 4
Dependent Claim
161 words
An information recording method of an optical recording medium for recording binary information by a series of recording marks and spaces between the recording marks, comprising the steps of: determining the length of the recording mark and the space depending on the information to be recorded so that one of the binary information corresponds to one of a front edge and a rear edge of the recording mark; and irradiating the optical recording medium with a light beam by pulse emission of the light beam, in accordance with the length of the recording mark and the space, wherein the light beam is emitted at bottom power value Pb for cooling the optical recording medium, first main heat power value Pw1, second main heat power value Pw2 and first preheat power value Paw for forming the recording mark, and second preheat power value Pae for forming the space, and the following relation holds; Pw1>Paw, Pw1>Pae, Pw1>Pb Pw2>Paw, Pw2>Pae, Pw2>Pb Paw>Pb, Pae>Pb, Paw≠Pae.
Claim 5
Dependent Claim
36 words
An information recording method according to claim 1, wherein the power value of light beam for forming the recording mark is different from the power value for forming the space, except for the bottom power value.
Claim 6
Dependent Claim
15 words
An information recording method according to claim 1, wherein the bottom power value is zero.
Claim 7
Dependent Claim
19 words
An information recording method according to claim 2, wherein the bottom power value Pb satisfies the relation of Pb=0.
Claim 8
Dependent Claim
30 words
An information recording method according to claim 2, wherein the first main heat power value Pw1 and second main heat power value Pw2 satisfy the relation of Pw1-1.5 mW≦Pw2≦Pw1+1.5 mW.
Claim 9
Dependent Claim
30 words
An information recording method according to claim 2, wherein the first main heat power value Pw1 and the first preheat power value Paw satisfy the relation of 1.5 mW≦Pw1/Paw≦3.5 mW.
Claim 10
Dependent Claim
28 words
An information recording method according to claim 2, wherein the first main heat power value Pw1 and the second preheat power value Pae satisfy the relation of 1.8≦Pw1/Pae.
Claim 11
Dependent Claim
15 words
An information recording method according to claim 3, wherein the bottom power value is zero.
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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) | 2001-10-19 | 2002-04-20 | 2002-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-10-19 | 2006-04-20 | 2006-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-10-19 | 2010-04-20 | 2010-10-20 | $7700.00 | Window Closed / Lapsed |