Liquid-crystal varifocal lens and focal length control method
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United States of America Patent
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Nov 19, 2019
Grant Date -
Jun 7, 2018
app pub date -
Sep 21, 2017
filing date -
Dec 6, 2016
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Abstract
A liquid-crystal varifocal lens includes a liquid crystal lens, and an ultrasonic transducer for generating an ultrasonic wave with a frequency that matches a resonant frequency of the liquid crystal lens. The ultrasonic transducer generates flexural oscillation in the liquid crystal lens such that the flexural oscillation has a vibration intensity decreasing continuously from the center to the circumference of a liquid crystal layer, whereby the thickness of the liquid crystal layer is changed, with the result that the orientation of the liquid crystal molecules is changed.
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