Tilt servo apparatus and control method thereof
US6690632B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 2000 |
| Grant date | Feb 10, 2004 |
| Priority date | — |
| Expiry date | Apr 12, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/13927
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tilt servo apparatus which can correct a tilt error at a high speed and with high precision irrespective of a magnitude of the tilt error even if a response speed of a liquid crystal device decreases is provided. An amount of change and an increase/decrease of a signal intensity are detected by changing a correction value of a tilt error correcting arrangement by a first correction width, and a correction width of the correction value and a correcting direction are determined on the basis of the detection result. When the amount of change of the signal intensity is smaller than a predetermined amount of change, the correction width is changed to a second correction width which is smaller than a first correction width. When it is larger than the predetermined amount of change, the correction width is changed to a third correction width larger than the first correction width. The correction width is also determined in accordance with a change in environmental temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.