Patent EP0212698A1 successfully refreshed from Google Patents.
EP0212698A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for recording and/or reading information on/from a rotating information disc
Assignee: Koninklijke Philips NV
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Filing: 1986-07-02
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Granted: —
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Expires: 2006-07-02
Abstract
Abstract The invention relates to an apparatus for recording and/or reading information on/from a rotating information disc (19). The apparatus comprises a turntable (11) which is rotatably supported on a deck plate (1) and comprises a centring member (13) for the disc, and a clamping device (21) for clamping the information disc on the turntable. The clamping device comprises a support (5) which is movable between an operative position and a rest position, and a disc-pressure means (23) which is coupled to the support. A flat electric drive unit (31) arranged in the clamping device serves for rotating an information disc placed on the turntable and comprises a stator section (35) which is secured to the support and a rotor section (33) which is secured to the disc-pressure means.
Inventors
- 👤 Leendert Zeeman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:57
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/20; G11B19/2009; G11B17/00; G11B17/02; G11B17/022; G11B17/028; G11B17/032
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
247 words
An apparatus for recording and/or reading information on/from a rotating information disc, comprising a deck-plate, a turntable which is rotatably supported on the deck plate and comprises a supporting surface for the information disc, a centring member for centring the information disc on the turntable relative to the axis of rotation of the turntable, a clamping device for clamping the information disc onto the turntable, which device comprises a disc-pressure means and a support therefor which is movable between an operative position and a rest position, the disc-pressure means, in the operative position of the support, being pressed against the information disc on the turntable and being rotatable relative to the support, and the latter, as it moves from the operative position onto the rest position cooperating with the disc-pressure means to move said means away from the information disc and thereby release the information disc, and the disc-pressure means being carried by the support when the latter is in its rest position, and an electric drive unit comprising a stator section and a rotor section for rotating the disc, which is supported by the turntable, in the operative position of the support, characterized in that the electric drive unit is mounted in the clamping device, the stator section of the drive unit being secured to the support and the rotor section to the disc-pressure means, and the rotor section is rotatable about the axis of rotation of the turntable in the operative position of the support.
Claim 2
Independent Claim
247 words
An apparatus for recording and/or reading information on/from a rotating information disc, comprising a deck-plate, a turntable which is rotatably supported on the deck plate and comprises a supporting surface for the information disc, a centring member for centring the information disc on the turntable relative to the axis of rotation of the turntable, a clamping device for clamping the information disc onto the turntable, which device comprises a disc-pressure means and a support therefor which is movable between an operative position and a rest position, the disc-pressure means, in the operative position of the support, being pressed against the information disc on the turntable and being rotatable relative to the support, and the latter, as it moves from the operative position onto the rest position cooperating with the disc-pressure means to move said means away from the information disc and thereby release the information disc, and the disc-pressure means being carried by the support when the latter is in its rest position, and an electric drive unit comprising a stator section and a rotor section for rotating the disc, which is supported by the turntable, in the operative position of the support, characterized in that the electric drive unit is mounted in the clamping device, the stator section of the drive unit being secured to the support and the rotor section to the disc-pressure means, and the rotor section is rotatable about the axis of rotation of the turntable in the operative position of the support.
Claim 3
Dependent Claim
61 words
An apparatus as claimed in claim 1, characterized in that the stator section and the rotor section are each of flat annular form, the two sections being arranged opposite each other so as to form a narrow air gap between them, and the clamping device is provided with ferromagnetic means for closing the magnetic flux circuit of the electric drive unit.
Claim 4
Dependent Claim
48 words
An apparatus as claimed in Claim 2, characterized in that the stator section comprises a set of coils arranged in a ring and the rotor section comprises an axially magnetized, multi-pole, flat annular permanent magnet, the magnet being arranged on a rotor closing plate of a ferromagnetic material.
Claim 5
Dependent Claim
64 words
An apparatus as claimed in Claim 1, 2 or 3, characterized in that on its side which faces the disc-pressure means the support is provided with an actuating member for moving the disc-pressure means and the rotor section of the drive unit away from the information disc on the turntable during the movement of the support from the operative position to the rest position.
Claim 6
Dependent Claim
58 words
An apparatus as claimed in Claim 4, the clamping device comprising permanent-magnetic means which exert a magnetic force between the support and the disc-pressure means, characterized in that in the rest position of the support the magnetic means press the disc-pressure means and the rotor section of the electric drive unit against the actuating member of the support.
References Cited (Backward Citations)
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