Determining emitter beam size for data storage medium
AssigneeHewlett-Packard Development Company, L.P.
InventorsJeffrey M. Valley, John Liebeskind
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Abstract
Determining a beam size of an emitter for a data storage medium is disclosed. The emitter, having an emitted beam, is moved across conductor of a detector. Current through the conductor, resulting from the emitted beam as the emitter moves across the detector, is measured. The size of the emitted beam of the emitter is determined based on the position of the emitter and the measured current.
Claims44
A method comprising:
- moving an emitter having an emitted beam across a conductor of a detector of a data storage medium;
- measuring current through the conductor resulting from the emitted beam as the emitter moves across the detector;
- and,
- determining a size of the emitted beam of the emitter based on a position of the emitter and the current measured.
A method comprising:
- moving an emitter having an emitted beam across a first position of a conductor of a detector of a data storage medium;
- measuring current through the conductor resulting from the emitted beam as the emitter moves across the first position of the conductor;
- moving the emitter across a second position of the conductor;
- measuring current through the conductor resulting from the emitted beam as the emitter moves across the second position of the conductor;
- determining dimensions of the emitted beam of the emitter relative to the detector based on the current measured through the first and the second positions of the conductor;
- and,
- calibrating a voltage of a focusing lens based on the dimensions of the emitted beam to achieve a desired size of the emitted beam.
A method comprising:
- moving a plurality of emitters having emitted beams across a first position of a conductor corresponding to a plurality of detectors positioned on a re-recordable data storage medium;
- moving a plurality of emitters having emitted beams across a second position of a conductor corresponding to a plurality of detectors positioned on a re-recordable data storage medium;
- measuring current through each conductor of each detector resulting from the emitted beam of a corresponding one of the emitters as the corresponding one of the emitters moves there across;
- determining dimensions of the emitted beams of the plurality of emitters relative to positions of the plurality of the emitters based on the currents measured;
- and,
- determining a focusing lens voltage based on the dimensions of the emitted beams to achieve a desired emitted beam dimension for each of the plurality of emitters.
A detector for a re-recordable data storage medium to assist determining a dimension of an emitted beam of an emitter used to read from and write to the medium, comprising:
- a first conductor to collect electrons from the emitted beam of the emitter;
- and,
- a second conductor to determine the dimension of the emitted beam based on current therethrough, the second conductor positioned relative to the first conductor such that the first conductor and the second conductors form an edge.
A detector for a data storage medium to assist determining a size of an emitted beam of an emitter used to read from and write to the medium, comprising:
- an electron collector to collect electrons from the emitted beam of the emitter;
- and,
- means for determining the size of the emitted beam based on current therethrough.
A data storage medium comprising:
- a substrate;
- a phase-changeable material positioned on the substrate;
- and,
- at least one detector positioned on the substrate for determining the size of an emitted beam on the phase-changeable material formed by an emitter.
A detector for a data storage medium for determining a size of an emitted beam of an emitter used to read from and write to the medium, the detector constructed by performing a method comprising:
- depositing a dielectric layer over a substrate of the medium;
- depositing a first conductive layer over the dielectric layer;
- depositing a second dielectric layer over the first conductive layer;
- depositing a second conductive layer over the second dielectric layer;
- and,
- patterning the second dielectric layer and the second conductive layer to form an edge between the first and second conductive layers.
A mass-storage device comprising:
- a plurality of memory cells, each memory cell having a phase-changeable material changeable from a first phase corresponding to a first logic value to a second phase corresponding to a second logic value;
- a plurality of emitters corresponding to the plurality of memory cells, each emitter capable of generating an emitted beam to read and change the phase of a corresponding memory cell;
- and,
- a plurality of detectors proximate the plurality of memory cells, for determining the size of the emitted beams.
Dependencies are inferred from the claim text.