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:
Jun. 01, 2021
Filed:
Aug. 23, 2019
Applicant:
Mitutoyo Corporation, Kanagawa, JP;
Inventors:
Shiro Igasaki, Kanagawa, JP;
Nobuo Ooba, Kanagawa, JP;
Assignee:
MITUTOYO CORPORATION, Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 3/14 (2006.01); G02B 15/14 (2006.01); G02B 7/02 (2021.01);
U.S. Cl.
CPC ...
G02B 3/14 (2013.01); G02B 15/14 (2013.01); G02B 7/02 (2013.01);
Abstract
A variable focal length lens apparatus includes a liquid lens apparatus in which the refractive index changes in accordance with an input drive signal, and a drive controller that outputs the drive signal to the liquid lens apparatus. The drive controller includes a resonance lock controller that changes a frequency of the drive signal by tracking the drive signal to a resonance frequency of the liquid lens apparatus, and a tracking delayer that delays a change in the frequency of the drive signal that is due to the resonance lock controller.