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公开(公告)号：US20180180774A1
公开(公告)日：2018-06-28
申请号：US15854251
申请日：2017-12-26
Applicant: MITUTOYO CORPORATION
Inventor： Tatsuya NAGAHAMA , Yuko SHISHIDO , Yuki KURAHASHI
Abstract: A variable focal length lens apparatus includes a lens system where a refractive index changes in response to an input drive signal; a field lens arranged on the same optical axis as the lens system; an image detector detecting an image of a measured object through the lens system and the field lens; a pulse illuminator providing pulse illumination of the measured object based on an input light emission signal; a temperature sensor detecting temperature information for an interior of the lens system; and a controller outputting the drive signal and the light emission signal in addition to correcting the timing of the light emission signal based on the temperature information.
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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
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.
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公开(公告)号：US20200073025A1
公开(公告)日：2020-03-05
申请号：US16556546
申请日：2019-08-30
Applicant: MITUTOYO CORPORATION
Inventor： Shiro IGASAKI , Nobuo OOBA , Masaki OKAYASU , Yuki KURAHASHI
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.
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公开(公告)号：US20210075951A1
公开(公告)日：2021-03-11
申请号：US17012291
申请日：2020-09-04
Applicant: MITUTOYO CORPORATION
Inventor： Raiitsu SUZUKI , Yuki KURAHASHI
Abstract: An image detection device includes: a liquid resonant lens system whose focal point is cyclically changed; an image detector configured to detect an image of an object through the lens system; a pulsed illuminator configured to provide pulsed illumination to the object in synchronization with the focal point; and an illumination controller configured to control the pulsed illuminator, in which the pulsed illuminator includes a main illumination section and a supplementary illumination section, and the illumination controller is configured to provide pulsed illumination to the object with the main illumination section and supplement illuminance on the object with the supplementary illumination section when the illuminance on the object by the main illumination section is equal to or less than a predetermined threshold.
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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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Patent Agency Ranking
公开(公告)号：US20250088754A1
公开(公告)日：2025-03-13
申请号：US18825483
申请日：2024-09-05
Applicant: MITUTOYO CORPORATION
Inventor： Yuki KURAHASHI
Abstract: An image detection device includes: a variable focal length lens whose focal length is periodically changed in response to a drive signal that is periodic; an illuminator configured to illuminate a measurement target; an image detector configured to detect an image of the measurement target through the variable focal length lens; a drive controller configured to output the drive signal to the variable focal length lens; a light-emission controller configured to output a light-emission signal, which is in synchronization with the drive signal, to the illuminator; an oscillation sensor configured to detect oscillation information of the variable focal length lens; and a synchronous controller configured to adjust an output timing of the light-emission signal based on the oscillation information.
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公开(公告)号：US20210173129A1
公开(公告)日：2021-06-10
申请号：US17141507
申请日：2021-01-05
Applicant: MITUTOYO CORPORATION
Inventor： Shiro IGASAKI , Yuki KURAHASHI
Abstract: A variable focal length lens device includes: a lens system of a liquid resonant type whose refractive index is changed in response to a drive signal to be inputted; a temperature sensor configured to acquire temperature information of the lens system; and a drive controller configured to control the lens system. The drive controller includes: a resonant frequency estimation unit configured to calculate an estimated value of a resonant frequency of the lens system on a basis of the temperature information; and a starting frequency setting unit configured to set a starting frequency of the lens system on a basis of the estimated value of the resonant frequency.
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8.发明申请公开(公告)号：US20210109336A1
公开(公告)日：2021-04-15
申请号：US17065079
申请日：2020-10-07
Applicant: MITUTOYO CORPORATION
Inventor： Yuki KURAHASHI
Abstract: A variable focal length lens device includes: a variable focal length lens whose focal length cyclically changes in accordance with an inputted drive signal; an image detector configured to detect an image of a measurement target through the variable focal length lens; a pulsed light illuminator configured to emit a pulsed light to illuminate the measurement target; and an illumination controller configured to control the pulsed light illuminator so that the pulsed light is emitted twice in one cycle of the drive signal based on two detection phases corresponding to a designated focal distance of the variable focal length lens.
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公开(公告)号：US20210075955A1
公开(公告)日：2021-03-11
申请号：US17012262
申请日：2020-09-04
Applicant: MITUTOYO CORPORATION
Inventor： Yuki KURAHASHI
IPC: H04N5/232 , G02F1/29 , H05B47/105
Abstract: An image detection device includes a liquid resonant lens system whose focal point is cyclically changeable; an image detector configured to detect a detection image in a to-be-imaged region through the lens system; a pulsed illuminator configured to emit pulsed light on the to-be-imaged region in synchronization with the focal point; and an illumination controller configured to increase or decrease an illumination duration of the pulsed illuminator depending on a required light volume of the to-be-imaged region at the focal point where the pulsed illuminator emits pulsed light.
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10.发明申请公开(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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