Hydrodynamic bearing and disk recording/reproducing apparatus

Details Hydrodynamic bearing and disk recording/reproducing apparatus Hydrodynamic bearing and disk recording/reproducing apparatus

2006-09-05

2006-09-05

Tupper, Robert S. (Department: 2627)

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

C384S107000

Reexamination Certificate

active

07102851

ABSTRACT:
A sleeve1is fixed on a base. Radial dynamic-pressure generating grooves1A and1B are provided on an inner surface of the sleeve1. A thrust plate4hermetically seals a lower opening end of the sleeve1. A shaft2is inserted inside the sleeve1, being allowed to revolve. A flange3is fixed at the bottom end of the shaft2, and its lower surface is placed close to an upper surface of the thrust plate4. Thrust dynamic-pressure generating grooves3A and3B are provided on the surfaces of the flange3. Gaps A–H among the sleeve1, the shaft2, the flange3, and the thrust plate4are filled with a lubricant5. Hollows1C–1F are provided on the inner surface of the sleeve1. The gaps A and C over the thrust dynamic-pressure generating grooves3A and3B and their vicinities are narrower than the surrounding gaps B and D (A<B, A<D, C<B, and C<D), and the surrounding gaps B and D are narrower than the gap H in the upper opening end of the sleeve1and its vicinity (B<H and D<H). The gaps E and G over the radial dynamic-pressure generating grooves and their vicinities are narrower than the surrounding gaps D and F (E<D, E<F, G<D, and G<F), and the surrounding gaps D and F are narrower than the gap H in the upper opening end of the sleeve1and its vicinity (D<H and F<H).

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