发明名称 |
Disk drive comprising extended range head proximity sensor |
摘要 |
A disk drive is disclosed comprising a head actuated over a disk, and a fly height transducer operable to generate a fly height signal for the head. The disk drive further comprises control circuitry comprising a current sensor operable to detect a current flowing through the fly height transducer. The current sensor comprises a differential amplifier operable to amplify the current flowing through the fly height transducer over a first range using a first gain, and amplify the current flowing through the fly height transducer over a second range using a second gain less than the first gain, wherein at least part of the second range is different than the first range. |
申请公布号 |
US9053730(B1) |
申请公布日期 |
2015.06.09 |
申请号 |
US201414185909 |
申请日期 |
2014.02.20 |
申请人 |
Western Digital Technologies, Inc. |
发明人 |
Hogg Dennis W. |
分类号 |
G11B21/02;G11B5/60 |
主分类号 |
G11B21/02 |
代理机构 |
|
代理人 |
|
主权项 |
1. A disk drive comprising:
a disk; a head actuated over the disk; a tunneling sensor; and control circuitry comprising a current sensor configured to detect a current flowing through the tunneling sensor, the control circuitry configured to:
detect a proximity of the head relative to the disk in response to the detected current flowing through the tunneling sensor; anddetect the head contacting the disk in response to the detected current flowing through the tunneling sensor,wherein the current sensor:
operates at a first gain over a first range corresponding to a first fly height; andoperates at a second gain over a second range corresponding to a second fly height, wherein the second fly height is lower than the first fly height. |
地址 |
Irvine CA US |