Koninklijke Philips Corporation N.v.

Rob Jacobus Matheus Coolen

Petrus Carolus Maria Frissen

George Arie Jan De Fockert

Michael Josepha Mathijs Renkens

Johan Cornelis Compter

Thomas Jan De Hoog

George Alois Leonie Leenknegt

Johan Cornelia Compter

A disk drive comprising a tray (TR) for receiving a disk, the tray (TR) being supported for movement between a first position within a casing (CS) of the disk drive and a second position projecting from the casing (CS), an electric motor for moving the tray (TR) between the first and second positions, and a regulation device for regulating an electric current through the motor for regulating the rotation of the motor. The regulation device comprises a detection device for detecting a back-electromotive voltage produced during rotation of the motor for deriving position information of the tray (TR) with respect to the first and second positions.

Disk drive with improved tray control

Positioning device having a first part () which is movable relative to a second part () in a X and Y-direction, said first part () comprising a carrier () on which a system of magnets () is arranged in a pattern of rows () and columns () parallel to the X- and Y-direction, respectively. The magnets in each row and column are arranged in a Halbach array, i.e. the magnetic orientation of each successive magnet in each row () and each column () is rotated through 90&#xb0; counter-clockwise. The second part () comprises an electric coil system () with two types of electric coils (C, C), one type having an angular offset of +45&#xb0; and the other type having an offset of &#x2212;45&#xb0; with respect to the X-direction. The magnet configuration causes a very strong magnetic field. The positioning device comprises a number of magnetically sensitive sensors (Hall sensors) giving a signal which depends on the local mutual positions of the permanent magnets of the first part relative to the electric coils of the second part in an area in which the parts overlap.

Displacement device

Positioning device having a first part ( ) which is movable relative to a second part ( ) in a X and Y-direction, said first part ( ) having a carrier ( ) on which a system of magnets ( ) is arranged in a pattern of rows ( ) and columns ( ) parallel to the X- and Y-direction, respectively. The magnets in each row and column are arranged in a Halbach array, i.e. the magnetic orientation of each successive magnet in each row ( ) and each column ( ) is rotated through 90&deg; counter-clockwise. The second part ( ) has an electric coil system ( ) with two types of electric coils (C , C ), one type having an angular offset of &plus;45&deg; and the other type having an offset of &minus;45&deg; with respect to the X-direction. The magnet configuration causes a very strong magnetic field. The positioning device has a number of magnetically sensitive sensors (Hall sensors ) giving a signal which depends on the local mutual positions of the permanent magnets of the first part relative to the electric coils of the second part in an area in which the parts overlap.

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Weert, Netherlands

Rob Jacobus Matheus Coolen