公开(公告)号：US20110051286A1

公开(公告)日：2011-03-03

申请号：US12551926

申请日：2009-09-01

Applicant: PUSKAL PRASAD POKHAREL ,  MUSTAFA CAN OZTURK ,  BARMESHWAR WIKRAMADITYA ,  ALEXEI H. SACKS ,  SUNDEEP CHAUHAN ,  DAVID SHIAO-MIN KUO

Inventor： PUSKAL PRASAD POKHAREL ,  MUSTAFA CAN OZTURK ,  BARMESHWAR WIKRAMADITYA ,  ALEXEI H. SACKS ,  SUNDEEP CHAUHAN ,  DAVID SHIAO-MIN KUO

IPC: G11B5/74

CPC classification number: G11B5/82 ,  B82Y10/00 ,  G11B5/59688 ,  G11B5/743 ,  G11B5/855

Abstract: A recordable magnetic media includes a servo pattern having a plurality of adjacent alternating magnetic and nonmagnetic material stripes. At least some of the magnetic material stripes have magnetic transitions that define encoded data.

Abstract translation: 可记录磁性介质包括具有多个相邻的交替磁性和非磁性材料条纹的伺服图案。 至少一些磁性材料条纹具有定义编码数据的磁性转变。

公开(公告)号：US06293135B1

公开(公告)日：2001-09-25

申请号：US09664713

申请日：2000-09-19

Applicant: Bruno Jean Marchon ,  David Shiao-Min Kuo ,  Wei Hsin Yao ,  Chiao-Ping Ku

Inventor： Bruno Jean Marchon ,  David Shiao-Min Kuo ,  Wei Hsin Yao ,  Chiao-Ping Ku

IPC: G01B1130

CPC classification number: G01N29/2418 ,  G01N2291/014 ,  G11B21/21 ,  G11B33/10

Abstract: A method and apparatus for calibrating a glide head and detector system performs a pre-screening to ensure the quality of the glide head and the piezoelectric sensor in the detection system. The glide head and the piezoelectric sensor detect a signal when the glide head makes contact with the disk, such as a magnetic recording disk. Calibration of the detection system utilizes a specially made bump disk that has asperities of desired height and size that protrude out of a flat disk surface. The glide head is flown over the bump disk, and by gradually reducing the disk spinning velocity, the head is brought closer to the disk and eventually into contact with the asperity. The onset of contact, as detected by the piezoelectric sensor, defines a disk spinning velocity for the head to fly at the desired height. In order to decouple the glide head flying characteristics and the piezoelectric quality and transfer function from other factors that affect the calibration of the detection system, laser pulses are directed at the glide head. Head vibrations are introduced in the glide head and detected by the piezoelectric sensor. The head excitations are recorded as a spectrogram in which the resonance frequencies are observed. From the amplitude and frequency readings, head resonance frequencies are identified and the piezoelectric sensor response is characterized. This allows the pre-screening of the head/sensor system and the decoupling of the glide head flying characteristics and the piezoelectric sensor quality from the asperity integrity effects on the calibration of the detection system.

Abstract translation: 用于校准滑行头和检测器系统的方法和装置进行预筛选以确保检测系统中的滑动头和压电传感器的质量。 滑动头和压电传感器在滑动头与磁盘（例如磁记录盘）接触时检测信号。 检测系统的校准使用特别制造的凸起盘，其具有从平坦盘表面突出的期望的高度和尺寸的粗糙度。 滑动头在凸块上方飞行，通过逐渐减小磁盘旋转速度，磁头更接近磁盘并最终与凹凸接触。 由压电传感器检测到的接触开始限定了磁头旋转速度以使头部以期望的高度飞行。 为了从其他影响检测系统校准的因素中去除滑行头的飞行特性和压电质量和传递函数，激光脉冲指向滑行头。 头部振动被引入到滑动头中并由压电传感器检测。 磁头激励被记录为其中观察到共振频率的频谱图。 从振幅和频率读数，识别头部谐振频率，并表征压电传感器响应。 这允许头部/传感器系统的预筛选和滑翔头飞行特性和压电传感器质量的去耦从对检测系统的校准的粗糙度完整性影响。