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US 4,358,802 AGranted
Fluid cushion turntable for video disc player
AssigneeMCA Disco-Vision, Inc.
InventorManfred H. Jarsen
Life of this patent
Estimating the term…
Abstract
A player for video discs includes an improved rotating turntable to provide a fluid cushion bearing to support a thin, flexible video disc. The turntable includes apertures which direct an air flow between the disc and the turntable surface and the flow of air acts as a hydrodynamic bearing.
Claims11
A turntable adapted to support and rotate a flexible annular disc lying thereon and concentric with it, comprising:
- a rotatable disc support member having an outer portion surrounding an annular land portion having a planar surface raised above the surrounding surface of said outer portion for supporting the flexible annular disc, the flexible disc overlying said annulas land portion and at least one section of said outer portion, and
- conduit means including at least one aperture through said disc support member and located radially outwardly of said annular portion,
- whereby said support member, in rotation, draws fluid into the area between the disc support member and the flexible annular disc supported thereon.
A turntable adapted to support and rotate a thin flexible disc having a central aperture comprising:
- (a) spindle means adapted to receive the disc central aperture;
- (b) holding means mounted on said spindle for clamping the disc for rotation with said spindle means;
- and,
- (c) disc support means connected to and concentric with said spindle means, including an annular land portion surrounding said spindle means for supporting the central portion of the disc;
- said disc support means further including an outer portion adjacent said annular land portion extending radially outwardly from and non-coplanar with said annular land portion, whereby a disc clamped to said turntable overlies said annular land portion and some of said outer portion and is normally in surface contact with the turntable in the annular land portion only, and is spaced away from the remainder of said disc support means surface;
- and conduit means including at least one aperture through said disc support means for supplying fluid to the area between the disc support means and the flexible whereby said disc support means, in rotation, draws fluid into the area between the disc support means and the flexible disc.
3 more elements
Dependencies are inferred from the claim text.