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US 8,576,407 B2Granted
Contactless optical glide head using at least two concurrent interference signals and a multi-channel light detector for detecting disk asperities
AssigneeHGST Netherlands B.V.
InventorsKarl Flechsig, Gurinder Singh, Timothy Strand
Life of this patent
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Abstract
A device for detecting disk asperities. The device includes an optical glide head. The glide head is not required to physically contact a disk for detection of the disk asperities. The optical glide head includes a waveguide configured to transmit light onto the disk and receive reflected light from the disk.
Claims18
A device for detecting disk asperities, comprising:
- an optical glide head, wherein said glide head is not required to physically contact a disk for detection of said disk asperities, said optical glide head comprising:
- a waveguide configured to transmit light onto said disk and receive reflected light from said disk, wherein said waveguide is further configured to receive at least two concurrent interference signals, wherein said interference signals comprise said reflected light from said disk and a second reflected light from a waveguide interface;
- a multi-channel light detector configured to detect said at least two concurrent interference signals received at said waveguide, wherein said multi-channel light detector is configured to receive said at least two concurrent interference signals through different channels;
- and
- a processor configured to determine if an asperity is detected on said disk.
2 more elements
A system for detecting disk asperities, comprising:
- an optical glide head, wherein said glide head is not required to physically contact a disk for detection of said disk asperities, said optical glide head comprising:
- a waveguide configured to transmit light onto said disk and receive reflected light from said disk, wherein said waveguide is further configured to receive at least two concurrent interference signals, wherein said interference signals comprise said reflected light from said disk and a second reflected light from a waveguide interface;
- a multi-channel light detector configured to detect said at least two concurrent interference signals received at said waveguide, wherein said multi-channel light detector is configured to receive said at least two concurrent interference signals through different channels;
- and
- a processor configured to determine if an asperity is detected on said disk.
2 more elements
A method for detecting disk asperities, said method comprising:
- disposing an optical glide head over a disk, wherein said optical glide head is not required to contact said disk;
- transmitting light from a waveguide onto said disk, wherein said waveguide is further configured to receive at least two concurrent interference signals, wherein said interference signals comprise said reflected light from said disk and a second reflected light from a waveguide interface;
- receiving at said waveguide at least two received reflections of said light transmitted onto said disk;
- detecting a disk asperity based at least on said at least two received reflections of said light transmitted onto said disk, wherein said multi-channel light detector is configured to receive said at least two concurrent interference signals through different channels;
- processing said at least two concurrent interference signals received at said waveguide to determine if an asperity is detected on said disk;
- transmitting said at least two received reflections of light from said waveguide to a beam splitter;
- and
- reflecting said at least two received reflections of light at said beam splitter to a detector.
5 more elements
Dependencies are inferred from the claim text.