VARIABLE FOCAL LENGTH LENS DEVICE AND VARIABLE FOCAL LENGTH LENS CONTROL METHOD
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United States of America Patent
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Issued Date -
Jun 27, 2024
app pub date -
Dec 26, 2023
filing date -
Dec 27, 2022
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Abstract
A variable focal length lens device includes: a liquid resonant liquid lens unit having a refractive index changeable in response to an inputted drive signal; a scanning range setter setting a predetermined standard frequency band as a scanning range of a frequency of the drive signal; a resonance frequency detector scanning the frequency of the drive signal over the scanning range and detecting a resonance frequency of the liquid lens unit based on an oscillation state of the liquid lens unit; and a resonance frequency estimator calculating an estimated value of a target resonance frequency based on a standard resonance frequency detected from the standard frequency band by the resonance frequency detector, the scanning range setter further setting a target frequency band including the estimated value of the target resonance frequency as the scanning range.
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