Patent · US Active

Data storage device employing low duty cycle square wave to detect head touchdown

US10217481B1 · kind B1 · utility

1Cited by

10References

20Claims

0Family size

Assignee

Western Digital Technologies, Inc. · US

Inventors

Shaomin Xiong · Newark, US
Na Wang · San Jose, US
Robert L. Smith · Lansdale, US
Sripathi Vangipuram Canchi · Sunnyvale, US

Key dates

Filing date	Mar 19, 2018
Grant date	Feb 26, 2019
Priority date	—
Expiry date	Mar 19, 2038

Classification

Technology area (CPC G)Physics
CPC primaryG11B5/607
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A data storage device is disclosed comprising a head actuated over a disk, wherein the head comprises a fly height actuator (FHA). An FHA control signal is applied to the FHA, wherein the FHA control signal comprises a rectangular wave having a duty cycle in the range of ten percent to thirty percent. While applying the FHA control signal to the FHA, the head touching down onto the disk is detected.

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