Playback instrument for an information carrier disc

US4322841A · kind A · utility

Assignee

• Licentia Patent-Verwaltungs-GmbH · DE

Inventors

• Heinz Borchard · Nortorf, DE
• Horst Redlich · Berlin, DE

Key dates

• Filing date: May 16, 1979
• Grant date: Mar 30, 1982
• Expiry date: May 16, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B17/0281
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A playback instrument for a record disc, the instrument including a turntable for supporting the disc to be played on which the disc is centered by means of a central bore, is provided with two annular, concentrically disposed, radially spaced flat bearing surfaces mounted on the turntable for the disc, the surfaces forming a rigid support, one bearing surface being disposed in the vicinity of the location of the center of such disc and the other bearing surface being disposed radially to the outside of the one surface at a distance from the location of the center of such disc, and disc holding components provided for exerting on such disc an attracting force of such magnitude as to cause the disc to contact the bearing surfaces over the entire area thereof.