Method and apparatus for non-contact servo writing
US5771130A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 15, 1996 |
| Grant date | Jun 23, 1998 |
| Priority date | — |
| Expiry date | Apr 15, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/106
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A non-contact servo writing system for positioning a transducer on a hard disk drive arm is disclosed. The positioning system includes a master assembly having a master arm. A light source is mounted on the master arm and is reflected off a reflector mounted on the hard drive arm. A sensor mounted on the master arm receives the reflected light and generates a signal proportional to the amount of reflected light received. A servo controller coupled to the sensor controls movement of the hard drive arm in accordance to the signal generated. In one embodiment, the sensor comprises a circuit having a first photosensing element and a second photosensing element. A first signal and a second signal proportional to the amount of reflected light received by the first photosensing element and the second photosensing element respectively are generated by the circuit. The sensor also provides a sensor output signal representative of the difference between the first signal and the second signal. The sensor output signal is representative of the position of the disk drive arm with respect to the master arm. The servo controller then moves the hard drive arm in accordance with the sensor output s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.