Apparatus and method for laser texturing a landing zone and a data zone of a magnetic recording medium
AssigneeSeagate Technology LLC
InventorJialuo Jack Xuan
Life of this patent
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Abstract
The substrate of a magnetic recording medium is laser textured with uniformity and precision employing a fiber optic laser delivery system to form a laser textured landing zone and a laser textured decoupled data zone. A continuous wave laser light beam is split into first and second continuous wave laser light sub-beams. The first continuous laser light sub-beam is impinged on a rotating substrate surface through a microfocusing lens system to laser texture a data zone. The second continuous wave laser light sub-beam is converted into a pulsed laser light beam and passed through a microfocusing lens to impinge on the substrate surface to laser texture a data zone.
Claims21
An apparatus for laser texturing a substrate for a magnetic recording medium, which apparatus comprises:
- a spindle for rotating the substrate during laser texturing;
- a source for emitting a continuous wave laser light beam;
- a beam splitter linked to the source for splitting the continuous wave laser light beam into first and second continuous wave laser light sub-beams;
- a microfocusing lens system positioned proximate a surface of the substrate;
- and
- a first fiber optic cable optically linked to the beam splitter and microfocusing lens system for passing the first continuous wave laser light sub-beam from the beam splitter through the microfocusing lens system to impinge on the rotating substrate surface to laser texture a data zone to form a plurality of substantially uniform concentric microgrooves for inducing magnetic orientation in a subsequently applied magnetic layer.
An apparatus for laser texturing a substrate for a magnetic recording medium, which apparatus comprises:
- a spindle for rotating the substrate during laser texturing;
- a source for emitting a continuous wave laser light beam;
- a beam splitter linked to the source for splitting the continuous wave laser light beam into first and second continuous wave laser light sub-beams;
- a microfocusing lens system positioned proximate a surface of the substrate;
- a first fiber optic cable optically linked to the beam splitter and microfocusing lens system for passing the first continuous wave laser light sub-beam from the beam splitter through the microfocusing lens system to impinge on the rotating substrate surface to laser texture a data zone;
- wherein the laser light beam source is a yttrium-aluminum-garnet, yttrium-lithium-fluoride or vanadium-yttrium-oxide laser source.
An apparatus for laser texturing a substrate for a magnetic recording medium, which apparatus comprises:
- a spindle for rotating the substrate during laser texturing;
- a source for emitting a continuous wave laser light beam;
- a beam splitter linked to the source for splitting the continuous wave laser light beam into first and second continuous wave laser light sub-beams;
- a microfocusing lens system positioned proximate a surface of the substrate;
- a first fiber optic cable optically linked to the beam splitter and microfocusing lens system for passing the first continuous wave laser light sub-beam from the beam splitter through the microfocusing lens system to impinge on the rotating substrate surface to laser texture a data zone;
- a converter optically linked to the beam splitter for converting the second continuous wave laser light sub-beam into a pulsed laser light beam;
- a microfocusing lens positioned proximate the substrate surface;
- and
- a second fiber optic cable optically linking the converter and microfocusing lens for passing the pulsed laser light beam through the microfocusing lens to impinge on the rotating substrate surface to laser texture a landing zone.
An apparatus for laser texturing a substrate for a magnetic recording medium, which apparatus comprises:
- a spindle for rotating the substrate during laser texturing;
- a source for emitting a high repetition rate laser light beam;
- a beam splitter linked to the source for splitting the high repetition rate laser light beam into first and second laser light sub-beams;
- a microfocusing lens system positioned proximate a surface of the substrate;
- and
- a first fiber optic cable optically linked to the beam splitter and microfocusing lens system for passing the first high repetition rate laser light sub-beam from the beam splitter through the microfocusing lens system to impinge on the rotating substrate surface to laser texture a data zone to form a plurality of substantially uniform concentric microgrooves for inducing magnetic orientation in a subsequently applied magnetic layer.
An apparatus for laser texturing a substrate for a magnetic recording medium, which apparatus comprises:
- a spindle for rotating the substrate during laser texturing;
- a source for emitting a high repetition rate laser light beam;
- a beam splitter linked to the source for splitting the high repetition rate laser light beam into first and second laser light sub-beams;
- a microfocusing lens system positioned proximate a surface of the substrate;
- a first fiber optic cable optically linked to the beam splitter and microfocusing lens system for passing the first high repetition rate laser light sub-beam from the beam splitter through the microfocusing lens system to impinge on the rotating substrate surface to laser texture a data zone;
- an acoustic optical modulator linked to the beam splitter for reducing the repetition rate of the second laser light sub-micron to form a low repetition rate pulsed laser light beam;
- a microfocusing lens positioned proximate the substrate surface;
- and
- a second fiber optic cable optically linking the acoustic optical modulator and microfocusing lens for passing the low repetition rate pulsed laser light beam through the microfocusing lens to impinge on the rotating substrate surface to laser texture a landing zone.
A method of manufacturing a magnetic recording medium, which method comprises:
- passing a high repetition rate pulsed laser light beam through a beam splitter to form first and second pulsed laser light sub-beams;
- and
- passing the first pulsed sub-light beam through a microfocusing lens system to impinge on a rotating substrate surface to laser texture a data zone to form a plurality of substantially uniform concentric microgrooves for inducing magnetic orientation in a subsequently applied magnetic layer.
A method of manufacturing a magnetic recording medium, which method comprises:
- passing a high repetition rate pulsed laser light beam through a beam splitter to form first and second pulsed laser light sub-beams;
- passing the first pulsed sub-light beam through a microfocusing lens system to impinge on a rotating substrate surface to laser texture a data zone;
- reducing the repetition rate of the second pulsed laser light sub-beam to a low repetition rate laser light beam;
- and
- passing the low repetition rate pulsed laser light beam through a microfocusing lens to impinge on the rotating substrate surface to laser texture a landing zone.
Dependencies are inferred from the claim text.