Magneto-optical device
AssigneeKoninklijke Philips Electronics N.V.
InventorRudolf Vullers
Life of this patent
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Abstract
In a magneto-optical device in which a laser (1) is directed through a coil (5) during operation, the coil itself is used as a measurement device for measuring the alignment of coil and laser by measuring the resistance of the coil as a function of the alignment of coil and laser beam.
Claims6
Magneto-optical device comprising a magneto-optical read and/or write head with a coil (5), and a means for generating a laser beam (1), wherein the laser beam is directed through an aperture (12) in the coil (5) during operation, characterized in that the optical disk recorder comprises means (DMNS) for measuring the resistance (RL) of the coil (5) and means (73) for changing the alignment of the coil and laser beam and/or the focusing of the laser beam in dependence on the resistance of the coil.
Method of manufacturing a magneto-optical device comprising a magneto-optical read and/or write head with a coil (5), and a means for generating a laser beam (1), wherein the laser beam is directed through an aperture (12) in the coil (5) during operation, in which manufacturing step the laser beam and the coil are aligned, characterized in that the resistance (RL) of the coil (5) is measured while the laser beam is being passed through the aperture of the coil, and the alignment of the coil and laser beam and/or the focusing of the laser beam is checked or changed in dependence on the measured resistance of the coil, and/or the resistance of the coil is measured as the alignment of the coil and laser beam is being changed.
Method of checking or tuning a magneto-optical device comprising a magneto-optical read and/or write head with a coil (5), and a means for generating a laser beam (1), wherein the laser beam is directed through an aperture (12) in the coil (5) during operation, characterized in that the resistance (RL) of the coil (5) is measured while the laser beam is being passed through the aperture of the coil, and the alignment of the coil and laser beam and/or the focusing of the laser beam is checked or changed in dependence on the measured resistance of the coil, and/or the resistance of the coil is measured as the alignment of the coil and laser beam is being changed.
Dependencies are inferred from the claim text.