Method for pre-calibrating balance gain of analog front end in optical disk drive to calibrate variation of focus balance
US7764577B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 13, 2008 |
| Grant date | Jul 27, 2010 |
| Priority date | — |
| Expiry date | Jan 24, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0945
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for pre-calibrating a balance gain of an analog front end in an optical disk drive to calibrate a variation of a focus balance. The method includes the steps of: adjusting the balance gain of the focus balance; moving a lens and getting an S curve; and comparing a positive half cycle of the S curve with a negative half cycle of the S curve. When the positive half cycle is equal to the negative half cycle, it represents that the balance gain of the focus balance is optimized and the procedure ends; or otherwise the above-mentioned steps are repeated to adjust the balance gain of the focus balance again. Because the balance gain is pre-calibrated, the optimal power calibration, the successful disk-reading possibility, the write-in quality and the stability of the disk judging mechanism can be enhanced and the consistency and the stability of the product can be improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.