Device for rotating a disc-shaped information carrier including

Details Device for rotating a disc-shaped information carrier including Device for rotating a disc-shaped information carrier including

1992-04-09

1993-03-09

Levy, Stuart S.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

369266, 369270, 360 9908, 384112, 384123, F16C 3510

Patent

active

051930846

ABSTRACT:
A device is disclosed which includes a frame (1), a turntable (3), and an electromagnetic drive unit comprising a stator section (5) and a rotor section (7). The turntable, which is rotatable about a shaft (19), and a frame portion (4) have facing annular bearing surfaces (21A and 21B respectively) to form a dynamic axial bearing. The bearing surfaces are coaxial with the shaft and radially spaced from this shaft. One of the bearing surfaces has at least one pattern of grooves which causes a pressure to be built up in a medium present between the bearing surfaces during rotation of the rotor section relative to the stator section.

REFERENCES:
patent: 3870382 (1975-03-01), Reinhoudt
patent: 4007974 (1977-02-01), Huber
patent: 4240141 (1980-12-01), Vasiliev et al.
patent: 4380355 (1983-04-01), Beardmore
patent: 4573807 (1986-03-01), Asada et al.
patent: 4686592 (1987-08-01), Carroll et al.
patent: 4998033 (1991-03-01), Hisabe et al.
patent: 5018881 (1991-05-01), Asada

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