Controllable optical lens
US7612947B2 · kind B2 · utility
9Cited by
1References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2005 |
| Grant date | Nov 3, 2009 |
| Priority date | — |
| Expiry date | Mar 24, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A controllable electrowetting lens system has a feedback control loop for controlling the electrode arrangement drive signals to implement an autofocus function. The feedback control loop comprising an image analysis focus detection system and a variable gain element. The gain is adjusted based on the lens condition, for example as sensed by a capacitance sensing arrangement. The autofocus control loop can be optimized to the lens characteristics (because the lens characteristics change over time) and/or to external conditions such as temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.