Patent · US Active

Variable focal length lens apparatus and control method

US11215739B2 · kind B2 · utility

1Cited by

0References

7Claims

0Family size

Assignee

Mitutoyo Corporation · JP

Inventors

Shiro Igasaki · Yokohama, JP
Nobuo Ooba · Yokohama, JP
Masaki Okayasu · Tokyo, JP
Yuki Kurahashi · Tokyo, JP

Key dates

Filing date	Aug 30, 2019
Grant date	Jan 4, 2022
Priority date	—
Expiry date	Apr 6, 2040

Classification

Technology area (CPC G)Physics
CPC primaryG02F1/294
WIPO fieldOptics
WIPO sectorInstruments

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 refractive power controller that controls refractive power of the lens system. The refractive power controller adjusts the voltage of the drive signal in accordance with effective power that is supplied to the liquid lens apparatus.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.