Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1996-03-06
1998-03-17
Renner, Craig A.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
360 9702, G11B 1702, G11B 3314
Patent
active
057294046
ABSTRACT:
A disc drive for storing and retrieving data from at least one memory storage disc includes a drive base and a spindle motor. The spindle motor includes a rotor hub, a shaft, a bearing unit. The bearing unit rotatably supports the rotor hub about an axis. A controlled resistance electrical pathway is established from the rotor hub to ground to control disc potential and to prevent excess static charge buildup. In one embodiment, the spindle motor includes structural elements made of a conducting plastic having a controlled resistance to establish a controlled resistance electrical pathway from the rotor hub to ground. In a second embodiment, the shaft of the spindle motor includes a conductive contact button electrically connected to the shaft and operatively coupled with a contact shield electrically grounded by an electrical conductor having a controlled resistance. In another embodiment, the spindle motor includes a rod made of conductive material extending from an electrically grounded contact shield and received within the shaft. An electrical pathway between the shaft and the rod is established by a conducting fluid between the rod and the shaft. Alternatively, the electrical pathway from the shaft to the rod is established by a conducting unit. The conducting unit includes a seal, a magnetic conductive material, and a ferro-fluid. The seal is positioned within the shaft. The magnetic conductive material is coupled to the rod. The ferro-fluid is supported between the seal and the magnetic conductive material.
REFERENCES:
patent: 3226666 (1965-12-01), Lord
patent: 3234495 (1966-02-01), Martinez
patent: 3610714 (1971-10-01), De Gaeta
patent: 3744326 (1973-07-01), Hetzel et al.
patent: 3786288 (1974-01-01), Joannou
patent: 3832020 (1974-08-01), McCloskey
patent: 4037125 (1977-07-01), Aoki
patent: 4101945 (1978-07-01), Butsch
patent: 4216512 (1980-08-01), Vidwans
patent: 4368398 (1983-01-01), Mabuchi
patent: 4378138 (1983-03-01), Sohre
patent: 4466033 (1984-08-01), Jordan et al.
patent: 4572285 (1986-02-01), Botts et al.
patent: 4577248 (1986-03-01), Cantwell
patent: 4604229 (1986-08-01), Raj et al.
patent: 4623952 (1986-11-01), Pexton
patent: 4628384 (1986-12-01), Raj et al.
patent: 4672487 (1987-06-01), Brand et al.
patent: 4701653 (1987-10-01), Merkle et al.
patent: 4779165 (1988-10-01), Elsaesser et al.
patent: 4780777 (1988-10-01), Biermeier et al.
patent: 4814652 (1989-03-01), Wright
patent: 4817964 (1989-04-01), Black, Jr.
patent: 4818907 (1989-04-01), Shirotori
patent: 4831295 (1989-05-01), Posedel
patent: 4841408 (1989-06-01), Matsunaga et al.
patent: 4928029 (1990-05-01), Wright
patent: 4943748 (1990-07-01), Shiozawa
patent: 4985792 (1991-01-01), Moir
patent: 4987514 (1991-01-01), Gailbreath et al.
patent: 4999724 (1991-03-01), McAllister et al.
patent: 5015893 (1991-05-01), Shiozawa
patent: 5089732 (1992-02-01), Konno et al.
patent: 5112146 (1992-05-01), Stangeland
patent: 5140479 (1992-08-01), Elsing et al.
patent: 5142173 (1992-08-01), Konno et al.
patent: 5163757 (1992-11-01), Graham
patent: 5251081 (1993-10-01), Cossette et al.
patent: 5295029 (1994-03-01), Elsing et al.
patent: 5304879 (1994-04-01), Suzuki et al.
patent: 5337374 (1994-08-01), Konishikawa
patent: 5367416 (1994-11-01), Cossette et al.
patent: 5430590 (1995-07-01), Ainslie et al.
patent: 5479304 (1995-12-01), Morita
patent: 5485331 (1996-01-01), Dunfield et al.
Dunfield John C.
Jue Clifford T.
Kazmierczak Frederick F.
Kloeppel Klaus
MacLeod Donald J.
Renner Craig A.
Seagate Technology Inc.
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