Lens positioning system
US8363324B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 10, 2008 |
| Grant date | Jan 29, 2013 |
| Priority date | — |
| Expiry date | Nov 23, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/67
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Systems and methods to position most precisely a lens system of an optical device are disclosed. Embodiments of these electrical sensors comprise capacitive sensors, inductive sensors and resistive sensors to measure the actual position of a lens system with a precision of at least 1 μm. Read-out circuits using double-correlated sampling structures are providing the position signals from the electrical sensors to a controller. The controller compares the actual position signals with a set-signal representing a target position of the lens signal and issues a signal to a motor to get the lens system moved to the target position. A variety of motors/actuators can be used to move a slider carrying the lens system to the position desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.