发明名称 |
SERVO WRITING SYSTEM TO BE USED IN DATA RECORDING DISK DRIVING DEVICE |
摘要 |
PROBLEM TO BE SOLVED: To provide a non-entrance type servo writing system which is to be used in a data recording disk drive. SOLUTION: A system measures the position of an actuator and generates a reference clock by using a semiconductor laser 200. The reference of the internal position is provided by reflection diffraction gratings mounted on an actuator arm and a spindle hub. A wave front reproducing optical system corrects aberration in the gratings. Moreover, optical sensors detect change of difference of a diffraction pattern to be generated by the gratings to exclude sensitivity with respect to a frequency drift. A decoding circuit converts data of the optical sensors into the measurement value of the position of the actuator. A control circuit drives a voice coil motor 118 in the disk drive and the motor positions a write-in transducer in order to record servo information to be provided in a servo pattern generator. Then, a servo writing device performs a writing to the drive which is completely assembled and is hermetically sealed through a transmission window in a head and disk assembly cover. |
申请公布号 |
JP2001043643(A) |
申请公布日期 |
2001.02.16 |
申请号 |
JP20000190872 |
申请日期 |
2000.06.26 |
申请人 |
INTERNATL BUSINESS MACH CORP <IBM> |
发明人 |
BEST JOHN STEWART;CHIANG WEN-WEI;STEVEN ROBERT HELLER;HORNE DONALD EDWARD;LEE CHIH-KUNG;MARRELLO VINCENT |
分类号 |
G01B11/00;G01B11/26;G01D5/38;G11B5/55;G11B21/08;G11B21/10;(IPC1-7):G11B21/10 |
主分类号 |
G01B11/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|