Patent · US Active

Contactless optical glide head using at least two concurrent interference signals and a multi-channel light detector for detecting disk asperities

US8576407B2 · kind B2 · utility

4Cited by

6References

18Claims

0Family size

Assignee

HGST Netherlands, B.V. · NL

Inventors

Karl A. Flechsig · Los Gatos, US
Gurinder Singh · Ellenabad, IN
Timothy Carl Strand · San Jose, US

Key dates

Filing date	Dec 22, 2009
Grant date	Nov 5, 2013
Priority date	—
Expiry date	Jun 26, 2031

Classification

Technology area (CPC G)Physics
CPC primaryG01B11/303
WIPO fieldMeasurement
WIPO sectorInstruments

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.