Hydrodynamic bearing and disk recording/reproducing...

Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record

Reexamination Certificate

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C360S099040, C360S099080

Reexamination Certificate

active

10725150

ABSTRACT:
Radial dynamic pressure grooves are provided in a first region4A and a second region4B on the side of a fixed shaft2. A vent2D is provided inside the top end2A of the fixed shaft2. The vent2D connects spaces over and under a flange3to each other. The flange3in an annular shape is fixed at the top end2A of the fixed shaft2. Thrust dynamic pressure grooves3A and3B are provided on the surfaces of the flange3. A circulation hole3C is provided in the flange3, and connects spaces over and under the flange3to each other. A sleeve4revolves around the fixed shaft2. A thrust plate6in an annular shape is fixed at the top of the sleeve4and opposed to the flange3. The first region4A, the second region4B, the thrust dynamic pressure grooves3A and3B, and the circulation hole3C of the flange3are filled with a lubricant7. At the revolution of the sleeve4, the lubricant7is concentrated in each central part of the first region4A, the second region4B, and the thrust dynamic pressure grooves3A and3B and their vicinities, then raising the pressure. The sleeve4keeps its stable high-speed revolution, avoiding contact with the fixed shaft2. The lubricant7circulates on surfaces of the flange3through the circulation hole3C.

REFERENCES:
patent: 5433529 (1995-07-01), Hensel
patent: 6059459 (2000-05-01), Ichiyama
patent: 6183135 (2001-02-01), Kloeppel et al.
patent: 6271612 (2001-08-01), Tanaka et al.

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