公开(公告)号：US20240210601A1

公开(公告)日：2024-06-27

申请号：US18395812

申请日：2023-12-26

Applicant: MITUTOYO CORPORATION

Inventor： Satoru YOSHIDA ,  Yuki KURAHASHI ,  Koji KUBO

IPC: G02B3/14 ,  G02F1/29

CPC classification number: G02B3/14 ,  G02F1/294 ,  G02F2203/15

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.

公开(公告)号：US20200208965A1

公开(公告)日：2020-07-02

申请号：US16717320

申请日：2019-12-17

Applicant: MITUTOYO CORPORATION

Inventor： Satoru YOSHIDA ,  Tatsuya NAGAHAMA ,  Hitoshi ISOBE ,  Masafumi YAMANAKA ,  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 ,  G02B21/36 ,  H04N5/225

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.