Controllable optical lens

Details Controllable optical lens Controllable optical lens

2005-09-28

2009-11-03

Dinh, Jack (Department: 2873)

Optical: systems and elements

Lens

Fluid

C359S698000, C359S245000, C359S253000, C359S900000

Reexamination Certificate

active

07612947

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.

REFERENCES:
patent: 7245439 (2007-07-01), Kuiper et al.
patent: 2002/0176148 (2002-11-01), Onuki et al.
patent: 2005/0041301 (2005-02-01), Kibayashi
patent: 03069380 (2003-08-01), None
patent: 2004077126 (2004-09-01), None

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