-
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.
-
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.
-
公开(公告)号：US20250047960A1
公开(公告)日：2025-02-06
申请号：US18790356
申请日：2024-07-31
Applicant: MITUTOYO CORPORATION
Inventor： Yuko SHISHIDO , Koji KUBO , Tatsuya NAGAHAMA
Abstract: A variable focal length lens device includes: a variable focal length optical system configured to change a focal length; a beam splitter configured to cause passing light, which is reflected off an object and passes through the variable focal length optical system, to branch into branched beams; an image-forming lens configured to condense the branched beams respectively; an image sensor configured to capture an image of the object by receiving the branched beam condensed by the image-forming lens; and an image sensor configured to capture an image of the object by receiving the branched beam condensed by the image-forming lens. An imaging distance on a first optical axis from the image sensor to the image-forming lens and an imaging distance on a second optical axis from the image sensor to the image-forming lens are different from each other.
-
公开(公告)号：US20170227352A1
公开(公告)日：2017-08-10
申请号：US15417751
申请日：2017-01-27
Applicant: MITUTOYO CORPORATION
Inventor： Norihiko MASUDA , Koji KUBO
IPC: G01B11/14
CPC classification number: G01B11/14 , G01B11/002 , G01B11/04 , G01B2210/50
Abstract: Provided is a chromatic confocal sensor including: a first light source that emits measurement light including a plurality of light beams having different wavelengths; a second light source that emits a visible light beam having a predetermined wavelength; an optical head that causes incident light to be converged at a focal position corresponding to a wavelength of the incident light and outputs reflection light reflected by an object to be measured at the focal position; a position calculation section that calculates a position of the object to be measured on the basis of the reflection light output by the optical head; and a switching section that selectively switches between a first operation in which only the measurement light enters the optical head and a second operation in which at least the visible light beam enters the optical head.
-
公开(公告)号：US20210223443A1
公开(公告)日：2021-07-22
申请号：US17148998
申请日：2021-01-14
Applicant: MITUTOYO CORPORATION
Inventor： Koji KUBO , Yuko SHISHIDO
Abstract: A variable focal length optical system includes: an imaging lens configured to condense a parallel beam of light from an objective lens to form an intermediate image; a relay system including, in sequence from an object side, a first relay lens and a second relay lens and configured to relay the intermediate image to infinity; and a lens system of a liquid resonant type which is located between the first relay lens and the second relay lens. A front principal point of the lens system is located to be conjugated with an exit pupil of the objective lens and an expression, 1.90≤fTube/fR1≤2.15, is satisfied. In the expression, fTube denotes a focal length of the imaging lens and fR1 denote a focal length of the first relay lens.
-
Patent Agency Ranking
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.
-
公开(公告)号：US20200041267A1
公开(公告)日：2020-02-06
申请号：US16519117
申请日：2019-07-23
Applicant: MITUTOYO CORPORATION
Inventor： Koji KUBO , Yuko SHISHIDO
Abstract: A non-contact type displacement sensor includes a light source that emits measurement light; a liquid lens apparatus in which a refractive index periodically changes in response to an input drive signal; an objective lens emitting, at a measurable object, the measurement light that is emitted from the light source and has passed through the liquid lens apparatus; a photodetector receiving the measurement light that is reflected by the measurable object and outputs a photodetection signal; and a signal processor (controller) that calculates focus timing with which the measurement light is in focus on a surface of the measurable object based on the photodetection signal output from the photodetector, and that obtains a position of the measurable object based on a phase of the focus timing with respect to a cycle of the drive signal.
-
公开(公告)号：US20210170523A1
公开(公告)日：2021-06-10
申请号：US17100022
申请日：2020-11-20
Applicant: MITUTOYO CORPORATION
Inventor： Koji KUBO
IPC: B23K26/06 , B23K26/0622 , B23K26/066 , B23K26/03
Abstract: A laser processing machine includes: a variable focal length optical system in which a focus position is periodically changed in response to a drive signal to be inputted; a position-detection light source configured to emit a detection light onto a workpiece through the variable focal length optical system; a light detector configured to receive the detection light reflected on the workpiece and output a light detection signal; a signal processor configured to output a synchronization pulse signal in synchronization with the focus timing when the detection light is focused on the surface of the workpiece in accordance with the inputted light detection signal; and a laser oscillator configured to oscillate a pulse laser beam in accordance with the inputted synchronization pulse signal to radiate the pulse laser beam on the workpiece through the variable focal length optical system.
-
公开(公告)号：US20200049545A1
公开(公告)日：2020-02-13
申请号：US16527486
申请日：2019-07-31
Applicant: MITUTOYO CORPORATION
Inventor： Koji KUBO
IPC: G01F23/292 , G01J1/32
Abstract: A non-contact displacement sensor includes a focus timing calculator that, calculates a measurement-side focus timing at which measurement light is focused on a surface of a measurable object, a first reference-side focus timing at which reference light is focused on a first reference surface, and a second reference-side focus timing at which the reference light is focused on a second reference surface; a characteristics calculator that calculates the refractive index characteristics of a liquid lens apparatus based on the first reference-side focus timing, the second reference-side focus timing, and an optical path length difference; and a position calculator that calculates a position of the measurable object based on the refractive index characteristics and a phase of the measurement-side focus timing relative to a period of a drive signal.
-
公开(公告)号：US20200041757A1
公开(公告)日：2020-02-06
申请号：US16519359
申请日：2019-07-23
Applicant: MITUTOYO CORPORATION
Inventor： Koji KUBO
Abstract: A variable focal length lens apparatus is provided with a variable focal length lens in which a focusing position periodically changes in response to a drive signal that is input; a light source that emits detection light at an object via the variable focal length lens; an photodetector that receives the detection light that is reflected by the object, and outputs a light detection signal; a signal processor that, based on the light detection signal that is input, outputs a light emission signal that is synchronized to a focusing time point where the detection light is focused on a surface of the object; an illuminator that provides pulse illumination to the object with illuminating light, based on the light emission signal that is input; and an image capturer that captures an image of the object through the variable focal length lens.
-
-
-
-
-
-
-
-
-
Search Results
11
records
(took 0.014 seconds)
