EP0146217A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Servo heads
Assignee: CENTURY DATA SYSTEMS Inc
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Filing: 1984-09-28
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Granted: —
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Expires: 2004-09-28
Abstract
Abstract An arm assembly for a disk drive having a read/write head and a servo head on the same Winchester arm assembly is described. To eliminate the possibility of crosstalk from the data head during the write mode, to the servo head, a 'Mumetal' shield (24) is used to surround partially the servo head ferrite core (18) and coil (20). The servo head is a composite structure having a non-conducting body (16) and a thin ferrite core (18) so that the magnetic core volume to be shielded is minimized, In addition, a conducting layer and a ferramic plate is interposed between the data and servo heads to isolate these heads further.
Inventors
- 👤 Chenshi J. Tung
- 👤 John Mansueto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 18:11
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/10; G11B5/11; G11B5/488
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
A servo head comprising: a read/write coil (14) a non-magnetic body (16), a magnetic core (18) in the form of a thin slab embedded in said body, said core comprising a portion on which said coil is wound and a gap (12) for sensing and generating local magnetic fields during reading and writing, and a first electromagnetic radiation shield (24) partially surrounding said coil to attenuate the pick-up of ambient electromagnetic noise by said coil.
Claim 2
Dependent Claim
75 words
A servo head comprising: a read/write coil (14) a non-magnetic body (16), a magnetic core (18) in the form of a thin slab embedded in said body, said core comprising a portion on which said coil is wound and a gap (12) for sensing and generating local magnetic fields during reading and writing, and a first electromagnetic radiation shield (24) partially surrounding said coil to attenuate the pick-up of ambient electromagnetic noise by said coil.
Claim 3
Dependent Claim
24 words
The head of Claim 1 wherein said non-magnetic body is calcium titanate, said core is MnZn ferrite, and said first shield is of 'Mumetal'.
Claim 4
Dependent Claim
38 words
The apparatus of Claim 1 or 2, further comprising a data head and an arm assembly on which said data head and servo head are mounted, said arm assembly further comprising a second interference shield between said heads.
Claim 5
Dependent Claim
13 words
The apparatus of Claim 3 wherein said second shield comprises a conducting layer.
Claim 6
Dependent Claim
16 words
The apparatus of Claim 3 wherein the leads to said heads are twisted to reduce crosstalk.
Claim 7
Dependent Claim
13 words
The apparatus of claim 3 wherein said second shield is a ferramic plate.
References Cited (Backward Citations)
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