Precision measurement and positioning system for disk storage system
US4870635A · kind A · utility
16Cited by
9References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1986 |
| Grant date | Sep 26, 1989 |
| Priority date | — |
| Expiry date | Sep 19, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5526
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention uses a small sized, low cost, high accuracy, semiconductor laser interferometer to position the transducer in a disc storage system. Light is reflected back over the path to be measured and directly back into the semiconductor laser. This causes the power present in the laser to be varied. Unexpectedly, the output of the photosensor associated with the laser has an asymmetric, sawtooth waveform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.