公开(公告)号：US11644304B2

公开(公告)日：2023-05-09

申请号：US17106638

申请日：2020-11-30

Applicant: MITUTOYO CORPORATION

Inventor： Masafumi Yamanaka

IPC: G01B11/02 ,  G02B27/00 ,  H04N23/55 ,  H04N23/67

CPC classification number: G01B11/02 ,  G02B27/0075 ,  H04N23/55 ,  H04N23/673

Abstract: A height measurement device includes: a lens system; a lens controller to output a drive signal to the lens system; a continuous illuminator to continuously illuminate a workpiece; an image detector to detect an image of the workpiece; an image calculation unit to calculate an EDOF image on a basis of a detected image; a focal depth adjustment unit to cause an extended focal depth of the EDOF image to be increased or decreased by increasing or decreasing an amplitude of the drive signal; a focus determination unit to determine a focus state of a portion of interest of the workpiece included in the EDOF image; and a height measurement unit to measure an upper limit or a lower limit of the extended focal depth, the upper limit or the lower limit being based on a timing at which the focus state of the portion of interest has changed.

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：USD870795S1

公开(公告)日：2019-12-24

申请号：US29658259

申请日：2018-07-30

Applicant: MITUTOYO CORPORATION

Designer： Masaki Okayasu ,  Masafumi Yamanaka ,  Isaiah Freerksen ,  Masanori Arai ,  Tatsuya Nagahama ,  Shigeru Ohtani ,  Yu Sugai ,  Yoshiro Asano