Laser optical disk position encoder with active heads
US5107107A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1990 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Mar 30, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/245
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An angular position encoder is provided that minimizes the effects of eccentricity and other misalignments between the disk and the read stations by employing heads which incorporate beam steering optics with the ability to actively track the disk in directions along the disk radius and normal to its surface. The device adapts features prevalent in optical disk technology toward the application of angular position sensing. A reflective disk and the principles of interferometry are employed. The servo controlled steering optics move so as to acquire a track on the disk lying at a predetermined radius and distance below the head, and then adjust position and orientation in order to maintain view of the disk track as required. Thus, the device is actively self-aligning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.