The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 07, 2026
Filed:
Dec. 26, 2023
Mitutoyo Corporation, Kanagawa, JP;
MITUTOYO CORPORATION, Kanagawa, JP;
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.