公开(公告)号：US11193757B2

公开(公告)日：2021-12-07

申请号：US16717320

申请日：2019-12-17

Applicant: MITUTOYO CORPORATION

Inventor： Satoru Yoshida ,  Tatsuya Nagahama ,  Masafumi Yamanaka ,  Hitoshi Isobe ,  Naoto Oita ,  Koji Kubo ,  Yuko Shishido ,  Nobuo Ohba ,  Takahisa Ootake ,  Hiroki Matsui ,  Masanori Arai ,  Shiro Igasaki ,  Yuki Kurahashi ,  Hiroshi Sakai ,  Yutaka Watanabe

IPC: G01B11/24 ,  H04N5/225 ,  G02B21/36

Abstract: An image measurement apparatus, which functions as a non-contact profile-measuring device, includes: an image sensor as an image pick-up device; a variable focal length lens (liquid lens unit) disposed on an optical axis extending from a workpiece to the image sensor; and a controller (image-pickup lens controller and image measurement processor) configured to control the variable focal length lens and process a detected image by the image sensor. The image measurement apparatus, which also functions as a non-contact displacement-detecting device, includes: an image sensor; a variable focal length lens (liquid lens unit) disposed on an optical axis extending from the workpiece to the image sensor; and a controller (displacement-detection lens controller and profile measurement processor) configured to control the variable focal length lens and a detected image by the image sensor.

公开(公告)号：US10908398B2

公开(公告)日：2021-02-02

申请号：US15947088

申请日：2018-04-06

Applicant: MITUTOYO CORPORATION

Inventor： Shiro Igasaki ,  Nobuo Ohba ,  Yuki Kurahashi

IPC: G02B15/14 ,  G02B7/04 ,  G02B3/14 ,  G02B7/28 ,  G02B7/08 ,  H04N5/225

Abstract: A variable focal length lens device includes: a lens system whose refractive index changes in accordance with an inputted drive signal; and a resonance-lock controller that locks the drive signal to a resonance frequency of the lens system. The resonance-lock controller tunes a frequency of the drive signal to a peak position of a voltage-current phase difference between a voltage of the drive signal and a drive current of the lens system, and raises or lowers the frequency of the drive signal in accordance with the drive current when the voltage-current phase difference changes.