Systems and methods reduce temperature induced drift effects on a liquid lens
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United States of America Patent
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Jun 23, 2020
Grant Date -
Dec 14, 2017
app pub date -
Aug 29, 2017
filing date -
Dec 31, 2013
priority date (Note) -
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Abstract
Systems and methods reduce temperature induced drift effects on a liquid lens used in a vision system. A feedback loop receives a temperature value from a temperature sensor, and based on the received temperature value, controls a power to the heating element based on a difference between the measured temperature of the liquid lens and a predetermined control temperature to maintain the temperature value within a predetermined control temperature range to reduce the effects of drift. A processor can also control a bias signal applied to the lens or a lens actuator to control temperature variations and the associated induced drift effects. An image sharpness can also be determined over a series of images, alone or in combination with controlling the temperature of the liquid lens, to adjust a focal distance of the lens.
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