公开(公告)号：US11022727B2

公开(公告)日：2021-06-01

申请号：US16549323

申请日：2019-08-23

Applicant: MITUTOYO CORPORATION

Inventor： Shiro Igasaki ,  Nobuo Ooba

IPC: G02B3/14 ,  G02B15/14 ,  G02B7/02

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.

公开(公告)号：US11215739B2

公开(公告)日：2022-01-04

申请号：US16556546

申请日：2019-08-30

Applicant: MITUTOYO CORPORATION

Inventor： Shiro Igasaki ,  Nobuo Ooba ,  Masaki Okayasu ,  Yuki Kurahashi

IPC: G02B3/14 ,  G02B3/00 ,  G02F1/11 ,  G02F1/29

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.