US4729048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic transducer combination with formatting, data, and servo heads
Assignee: Sony Corp
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Filing: 1986-03-10
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Granted: 1988-03-01
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Expires: 2006-03-10
Abstract
Abstract A combination magnetic transducer head apparatus which can easily achieve initial formatting of data tracks of a rotating magnetic recording medium such as a hard disk without using a specific separate initial formatting system. The apparatus comprises a magnetic head for initial formatting, another magnetic head for servo control and a magnetic recording and playback head all mounted on a head slider. In the apparatus, at least one track is first recorded on a magnetic disk by the magnetic head for initial formatting and then another track is recorded by the magnetic recording and playback head while the first track is scanned by the magnetic head for servo control whereafter such a series of operations are repeated until completion of recording of all tracks required.
Inventors
- 👤 Shigeyoshi Imakoshi
- 👤 Hideo Suyama
- 👤 Hiroaki Yada
- 👤 Toru Katakura
- 👤 Tetsuo Sekiya
- 👤 Masayuki Nakayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:40
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/012; G11B5/48; G11B5/488; G11B5/4886; G11B5/54; G11B5/55; G11B5/5521; G11B5/5526; G11B5/553; G11B5/5534; G11B5/58; G11B5/596; G11B5/59633
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
188 words
A combination magnetic transducer head apparatus, comprising: a slider disposed in an opposing relationship to a rotating magnetic recording medium and mounted for movement in a radial direction of the rotating magnetic recording medium; and a data signal recording and playback magnetic head mounted on said slider, a pair of tracking signal playback magnetic heads mounted on said slider and having the same trace width, and an initial tracking signal recording magnetic head mounted on said slider and having three or more head sections; whereby, where the pitch of tracks to be formed on the rotating magnetic recording medium is P, the pitch of said plurality of head sections of said initial tracking signal recording magnetic head in a direction of the arrangement of the tracks is selected to be equal to twice of the pitch P of the tracks while the distance in the direction of the arrangement of the tracks between the center of the trace width of said data signal recording and playback magnetic head and the center between the traces of said pair of tracking signal playback magnetic heads is selected to be 3P.
Claim 2
Dependent Claim
188 words
A combination magnetic transducer head apparatus, comprising: a slider disposed in an opposing relationship to a rotating magnetic recording medium and mounted for movement in a radial direction of the rotating magnetic recording medium; and a data signal recording and playback magnetic head mounted on said slider, a pair of tracking signal playback magnetic heads mounted on said slider and having the same trace width, and an initial tracking signal recording magnetic head mounted on said slider and having three or more head sections; whereby, where the pitch of tracks to be formed on the rotating magnetic recording medium is P, the pitch of said plurality of head sections of said initial tracking signal recording magnetic head in a direction of the arrangement of the tracks is selected to be equal to twice of the pitch P of the tracks while the distance in the direction of the arrangement of the tracks between the center of the trace width of said data signal recording and playback magnetic head and the center between the traces of said pair of tracking signal playback magnetic heads is selected to be 3P.
Claim 3
Dependent Claim
35 words
A combination magnetic transducer head according to claim 1 wherein the trace width of each head section of said initial tracking signal recording magnetic head being equal to the width W of each track T.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |