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公开(公告)号：US20180314042A1
公开(公告)日：2018-11-01
申请号：US15947144
申请日：2018-04-06
Applicant: MITUTOYO CORPORATION
Inventor： Shiro IGASAKI , Nobuo OHBA , Koji KUBO , Takahisa OOTAKE
Abstract: A variable focal length lens device includes: a lens system whose refractive index changes depending on an inputted drive signal; an objective lens disposed in an optical axis common to the lens system; an image detector for detecting an image of a target object through the lens system and the objective lens; a resonance-lock controller for locking the frequency of the drive signal to a resonance frequency of the lens system; and a resonance-lock operation unit for switching enabling and suspending the resonance-lock controller.
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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
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.
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公开(公告)号：US20180314041A1
公开(公告)日：2018-11-01
申请号：US15947088
申请日：2018-04-06
Applicant: MITUTOYO CORPORATION
Inventor： Shiro IGASAKI , Nobuo OHBA , Yuki KURAHASHI
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.
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