公开(公告)号：US20140254344A1

公开(公告)日：2014-09-11

申请号：US14282176

申请日：2014-05-20

Applicant: Seagate Technology LLC

Inventor： Dongming Liu ,  Lin Zhou ,  Adam Karl Himes ,  Lee Clifford Knippenberg ,  Michael Thomas Johnson

IPC: G11B5/60

CPC classification number: G11B5/6029 ,  G11B5/6005 ,  G11B5/6011 ,  G11B5/607 ,  G11B5/6076 ,  G11B27/36 ,  G11B2220/2516

Abstract: A method of detecting a contact between a transducing head and a storage medium is provided. The method applies an input signal, having a select power level and known frequency, to an actuator for actuating the head. An output signal is obtained in response to the input signal. At least one signal component is extracted from the output signal at the same or a harmonic of the same known frequency as the input signal applied to the actuator. Whether the at least one extracted signal component indicates a contact between the head and the medium is determined. The power level of the applied wave pattern is increased incrementally until the extracted signal component indicates a contact between the head and the storage medium.

Abstract translation: 提供了一种检测换能头与存储介质之间的接触的方法。 该方法将具有选择功率电平和已知频率的输入信号施加到用于致动头部的致动器。 响应于输入信号获得输出信号。 以与施加到致动器的输入信号相同的已知频率的相同或谐波从输出信号提取至少一个信号分量。 确定至少一个提取的信号分量是否指示头部和介质之间的接触。 所施加的波形图案的功率电平逐渐增加，直到提取的信号分量表示头部和存储介质之间的接触。