US5577012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data recording method, data recording apparatus, and data recording medium
Assignee: Sony Corp
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Filing: 1995-05-23
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Granted: 1996-11-19
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Expires: 2015-05-23
Abstract
Abstract In recording information by shifting the positions of the front edge and the rear edge of each pit on a medium stepwise from specified reference positions according to recording data, the edges of each pit are displaced stepwise with a unit of macro-step of 0.04 mu m, to express the data. The positions of the edges with macro-step are further adjusted to be displaced stepwise with a unit of micro-step of 256 kinds, thus suppressing the Inter Symbol Interference. With this adjustment, it is possible to reduce the influence of the Inter Symbol Interference, and hence to perform the recording with high density.
Inventors
- 👤 Seiji Kobayashi
- 👤 Joost D. Kock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:48
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/0045; G11B20/00; G11B20/10; G11B20/10009; G11B7/24; G11B7/2407; G11B7/24085
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
167 words
A data recording apparatus for displacing a position of an edge of each pit on a recording medium stepwise with a first width for recording data on said recording medium, comprising: a converting means for converting a first data to be recorded into a second data corresponding to a number of steps displaced with said first width; a calculating means for calculating the position of said edge of each pit displaced with said first width corresponding to the second data converted by said converting means, and displacing the position of said edge specified by said first width stepwise with a second width smaller than said first width, wherein the second width is determined on the basis of positions of edges of other pits so that an interference caused by the edges of the other pits is reduced; and a signal generating means for outputting a signal with a timing corresponding to the position of the edge of said pit according to an output of said calculating means.
Claim 2
Dependent Claim
167 words
A data recording apparatus for displacing a position of an edge of each pit on a recording medium stepwise with a first width for recording data on said recording medium, comprising: a converting means for converting a first data to be recorded into a second data corresponding to a number of steps displaced with said first width; a calculating means for calculating the position of said edge of each pit displaced with said first width corresponding to the second data converted by said converting means, and displacing the position of said edge specified by said first width stepwise with a second width smaller than said first width, wherein the second width is determined on the basis of positions of edges of other pits so that an interference caused by the edges of the other pits is reduced; and a signal generating means for outputting a signal with a timing corresponding to the position of the edge of said pit according to an output of said calculating means.
Claim 3
Dependent Claim
61 words
A data recording apparatus according to claim 1, wherein said signal generating means further comprises: a D/A converting means for digital-analog converting the output of said calculating means; a sawtooth wave generating means for generating a sawtooth wave; a comparing means for comparing the sawtooth wave outputted from said sawtooth wave generating means with the output of said D/A converting means.
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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) | 1999-11-19 | 2000-05-20 | 2000-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-19 | 2004-05-20 | 2004-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-19 | 2008-05-20 | 2008-11-19 | $7700.00 | Window Closed / Lapsed |