US5253122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording of digital video signals on a magnetic medium having a particular energy product and surface roughness
Assignee: Sony Corp
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Filing: 1991-10-30
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Granted: 1993-10-12
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Expires: 2011-10-30
Abstract
Abstract A magnetic tape for the recording of digital video signals is constituted by a nonmagnetic base having thereon a magnetic layer of at least one thin magnetic metal film which has an energy product of at least 100 G.cm.Oe, and with the surface roughness of the magnetic tape being at most 0.003 μm in center line average height. Such tape, when used with magnetic heads each having a gap defined between portions of the respective head having a saturation magnetic flux density of at least 14 kG., contribute to the maintenance of an acceptable raw error bit rate below 1×10 -4 when recording with a recorded bit area of no more than 1.25 μm 2 /bit.
Inventors
- 👤 Kazunobu Chiba
- 👤 Kenichi Sato
- 👤 Yuichi Arisaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:48
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B5/00; G11B5/008; G11B5/00813; G11B5/00847; G11B5/0086; G11B20/00007; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426; G11B20/18; G11B20/1806; G11B20/1813; G11B5/02; G11B5/09; G11B5/127; G11B5/187; G11B5/21; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; G11B5/73931; G11B5/73935; G11B5/84; G11B5/85; H; H04; H04N; H04N19/00; H04N19/90; H04N19/98; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/926; H04N5/9261
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
115 words
A method for magnetically recording digital video signals comprising the steps of: converting input digital video signals into data segmented into blocks each composed of a plurality of pixel data; compression-coding s id blocks of pixel data block-by-block; converting the compression-coded data into channel-encoded data; and supplying said channel-encoded data to magnetic heads on a rotary drum for recording by such heads on a magnetic recording medium constituted by a nonmagnetic base having thereon a magnetic layer of at least one thin magnetic metal film which has an energy product of at least 100 G.cm.Oe, and with the surface roughness of said magnetic recording medium being at most 0.003 μm in center line average height.
Claim 2
Independent Claim
115 words
A method for magnetically recording digital video signals comprising the steps of: converting input digital video signals into data segmented into blocks each composed of a plurality of pixel data; compression-coding s id blocks of pixel data block-by-block; converting the compression-coded data into channel-encoded data; and supplying said channel-encoded data to magnetic heads on a rotary drum for recording by such heads on a magnetic recording medium constituted by a nonmagnetic base having thereon a magnetic layer of at least one thin magnetic metal film which has an energy product of at least 100 G.cm.Oe, and with the surface roughness of said magnetic recording medium being at most 0.003 μm in center line average height.
Claim 3
Dependent Claim
38 words
The method for magnetically recording digital video signals according to claim 1; wherein each of said heads has a gap defined between portions of the respective head having a saturation magnetic flux density of at least 14 kG.
Claim 4
Dependent Claim
30 words
The method for magnetically recording digital video signals according to claim 2; wherein said magnetic layer comprises a plurality of said thin magnetic metal films deposited successively on said base.
Claim 5
Dependent Claim
30 words
The method for magnetically recording digital video signals according to claim 1; wherein said magnetic layer comprises a plurality of said thin magnetic metal films deposited successively on said base.
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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) | 1996-10-11 | 1997-04-12 | 1997-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-11 | 2001-04-12 | 2001-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-11 | 2005-04-12 | 2005-10-12 | $7700.00 | Window Closed / Lapsed |