WO2006038439A1 - 焦点位置制御機構付き観察装置 - Google Patents
焦点位置制御機構付き観察装置 Download PDFInfo
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- WO2006038439A1 WO2006038439A1 PCT/JP2005/016843 JP2005016843W WO2006038439A1 WO 2006038439 A1 WO2006038439 A1 WO 2006038439A1 JP 2005016843 W JP2005016843 W JP 2005016843W WO 2006038439 A1 WO2006038439 A1 WO 2006038439A1
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- Prior art keywords
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- light
- control mechanism
- optical system
- position control
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/24—Base structure
- G02B21/241—Devices for focusing
- G02B21/245—Devices for focusing using auxiliary sources, detectors
- G02B21/247—Differential detectors
Definitions
- the present invention relates to an observation apparatus with a focal position control mechanism.
- observation apparatuses such as microscopes that can observe a minute sample as an object and record an observation image as a video image have led to an inspection process in an industrial field including research in a biological field.
- the focus is usually adjusted by adjusting the focus of the observation sample by operating the focusing handle.
- the focal depth is shallow and the focusing range is narrow as in the case of a high-magnification objective lens, considerable skill is required for quick focusing operation.
- This operability has bad effects, fatigue of workers, reduced production efficiency, and bad effects. Especially in routine operations such as the inspection process, it is very important to perform this operation quickly to shorten the inspection time.
- AF devices in the industrial field not only improve operability and throughput, but also, for example, for a specimen having a step such as a multi-layered semiconductor wafer, between each layer of defects and patterns. Detecting and measuring line widths without omissions, or measuring minute steps on a subject with high accuracy, there is a need for any application, and AF devices with performance suitable for these inspections and measurements have been proposed. Yes.
- AF device in the industrial field light such as an infrared laser is projected onto the subject to detect the reflected light state for reasons such as compatibility with the subject and shortening of the AF time.
- the so-called active AF method which performs focusing operation, is often used.
- a method called a knife edge method is known. The in-focus position is described in detail in Japanese Patent Laid-Open No. 2001-296469.
- the spot light projected onto the subject is a single minute light beam (hereinafter referred to as a single spot method). Therefore, light is scattered at the edge portion near the step of the subject as shown in FIG. 8B, and the amount of signal light that should be returned is insufficient, and the AF operation becomes unstable. Furthermore, as shown in FIG. 8C, when observing a subject having a plurality of steps in the same field of view, only the step at the position where the spot light is projected is in focus, and other step portions are extremely blurred. It is inefficient for line and line width measurement by recognizing the pattern image in the field of view!
- the collimator lens is vibrated by a voice coil motor to vibrate the spot light on the wafer to form a line-like light projection and generate a position detection signal to improve performance (for example, see JP-A-2001-82926;).
- the projection light is made into a slit shape as shown in FIG. 9A by inserting a cylindrical lens in the laser beam, and the return light at the edge portion near the step of the subject as shown in FIG. 9B.
- a diffraction grating to widen the range of projection light to the subject (see, for example, Japanese Patent Application Laid-Open No. 2001-296469).
- a plurality of spot-shaped projection methods are referred to as a multi-spot method.
- an object of the present invention is to provide an observation apparatus with a focus position control mechanism that can achieve an average focus on a subject having a plurality of steps and achieves focusing stability.
- the present invention employs the following means in order to solve the above problems.
- An observation apparatus with a focal position control mechanism includes an observation optical system having an imaging element that irradiates a subject with illumination light through one of a plurality of interchangeable objective lenses and observes light of the subject force.
- a light projecting unit that irradiates the subject with visible light through the objective lens of the observation optical system, and an image surface of the optical image of the visible light reflected by the subject, and the image of the optical image.
- a focus detection optical system that detects a relative distance between the object lens and the subject, and a photoelectric conversion unit that outputs a signal corresponding to an in-plane position; and an output signal from the focus detection optical system.
- An object position adjusting unit that adjusts the in-focus position of the object and a diaphragm unit that adjusts the projection range of the visible light are provided.
- This observation device with a focal position control mechanism can block the visible light radiated to the portion where the imaging range force protrudes even in the real field of view by the diaphragm means, and the observation is performed when adjusting the distance.
- the subject can be aligned by limiting the incidence of invisible light outside the imaging range necessary for the incident to the photoelectric conversion unit within the imaging range.
- the observation apparatus with a focus position control mechanism is the observation apparatus with the focus position control mechanism, wherein the focus detection optical system includes the intermediate imaging position of the visible light, A diaphragm means is arranged at the intermediate image forming position.
- a projection means having a diaphragm diameter corresponding to the imaging range is arranged at the intermediate imaging position, so that the projection range of invisible light is more preferably limited to the imaging range. Can be flooded.
- the observation apparatus with a focal position control mechanism provides the focal position control mechanism.
- the diaphragm means is disposed between the subject and the objective lens.
- the observation apparatus with a focus position control mechanism is the observation apparatus with the focus position control mechanism, wherein the focus detection optical system forms an image of the non-visible light on the photoelectric conversion unit.
- the diaphragm means is disposed between the imaging lens and the photoelectric conversion unit.
- the projection range of the visible light is more preferably limited to the imaging range by disposing the aperture unit having an aperture diameter corresponding to the imaging range at the above-described position. Can be projected.
- the observation apparatus with a focal position control mechanism is the observation apparatus with the focal position control mechanism, wherein the diaphragm means has a plurality of different diaphragm diameters that can be selected. It is characterized by having.
- This observation apparatus with a focal position control mechanism can select the optimum aperture diameter for the imaging element and imaging range.
- the observation apparatus with a focal position control mechanism is the observation apparatus with the focal position control mechanism, wherein the aperture means includes a variable aperture capable of adjusting an aperture diameter.
- This observation apparatus with a focal position control mechanism can be selected while adjusting on the spot without having to set a plurality of aperture diameters that are optimal for the imaging range of the imaging device in advance.
- the observation apparatus with a focus position control mechanism is the observation apparatus with the focus position control mechanism, wherein the aperture diameter of the aperture stop means is set based on an output signal from the subject position adjustment means.
- a control unit for adjustment is provided.
- This observation apparatus with a focus position control mechanism can automatically adjust the optimum aperture diameter for the imaging range, and can make a suitable adjustment in a short time.
- the present invention it is possible to improve the focusing performance by improving the focusing stability within the imaging range of the subject. Defect extraction must be performed accurately, especially for pattern defect observation. This makes it possible to easily compare the defect with the reference image during defect classification and improve the defect classification accuracy.
- FIG. 1 is a schematic diagram showing the configuration of a microscope AF device according to a first embodiment of the present invention.
- FIG. 2A is a view showing a subject with a step to be observed in the AF apparatus for a microscope according to the first embodiment of the present invention.
- FIG. 2B is a diagram showing the state of spot light irradiated to a subject with a step in the case of the single spot projection method.
- FIG. 2C is a diagram showing the state of spot light irradiated to a subject with a step in the case of the multi-spot projection method.
- FIG. 3A is a diagram showing a subject with unevenness with different heights to be observed in the microscope AF device according to the first embodiment of the present invention.
- FIG. 3B In the case of the single spot projection method for a subject with unevenness of different heights to be observed, the state of the spot light irradiated on the subject and the photo detector at that time It is a figure which shows the state of spotlight.
- FIG. 3C In the case of the multi-spot projection method for a subject with unevenness of different heights to be observed, the state of the spot light irradiated on the subject and the spot light on the photodetector at that time It is a figure which shows the state of.
- FIG. 4 is an explanatory diagram showing a relationship between an optical field of view and an imaging range when observing an object having a step in the AF device for a microscope according to the first embodiment of the present invention.
- FIG. 5 is a schematic diagram showing the configuration of an AF apparatus for a microscope according to a second embodiment of the present invention.
- FIG. 6 is a schematic diagram showing the configuration of an AF apparatus for a microscope according to a third embodiment of the present invention.
- FIG. 7 is a schematic view showing a configuration of an AF apparatus for a microscope according to a fourth embodiment of the present invention.
- FIG. 8A In the single-spot projection method, light is projected onto the flat surface of the convex part on the subject with irregularities. It is a figure which shows the mode of the spot light in case the spot is irradiated.
- FIG. 8B is a diagram showing the state of the spot light when the light spot is irradiated on the edge portion of the convex portion on the subject having irregularities in the single spot projection method.
- FIG. 8C is a diagram showing a state of spot light in the case of irradiating a subject with unevenness having different heights in the single spot projection method.
- FIG. 9A is a diagram showing the state of spot light when a light spot is irradiated on the flat surface of a convex portion on a subject with irregularities in the slit-shaped multi-spot projection method.
- FIG. 9B is a diagram showing the state of spot light in the slit-shaped multi-spot projection method when a light spot is irradiated on the edge portion of the convex portion on the subject with irregularities.
- FIG. 9C is a diagram showing the state of spot light when the slit-shaped multi-spot projection method is used to irradiate an object having unevenness with different heights.
- FIG. 10 is an explanatory view showing another example of the fixed aperture of the microscope AF device according to the first embodiment of the present invention.
- FIG. 11 is an explanatory view showing another example of the variable aperture of the AF device for a microscope according to the second embodiment of the present invention.
- Microscope AF device observation device with focal position control mechanism
- the microscope AF device (observation device with a focus position control mechanism) 1 irradiates illumination light onto the subject 3 through one of a plurality of replaceable objective lenses 2 as shown in FIG.
- the observation optical system 6 having a CCD (imaging device) 5 for observing the reflected light from the subject 3, and the infrared laser beam (invisible light) to the subject 3 through the objective lens 2 of the observation optical system 6
- a focus detection optical system 10 for detecting the relative distance between the objective lens 2 and the subject 3 and a subject position adjusting means 1 for adjusting the in-focus position of the subject 3 based on an output signal from the focus detection optical system 10 1 and the aperture means 12 for adjusting the laser beam projection range within the imaging range of the CCD 5, and the operation unit 13
- a control unit (control unit) 14 that adjusts the aperture diameter of the aperture means 12 based on the output signal is provided.
- the CCD 5 is connected to an image generating device 60, and the image generating device 60 is connected to an image monitor 61.
- the focus detection optical system 10 further includes a polarization beam splitter 15 that separates the optical path between the light emitted from the light projecting unit 7 and the reflected light from the subject 3, and the direction of the emitted light in the direction of the subject 3. And deflects the reflected light from the subject 3 in the direction of the polarizing beam splitter 15, and once collects the laser light between the polarizing beam splitter 15 and the polarizing beam splitter 15 and the dichroic mirror 16 for the objective.
- a polarization beam splitter 15 that separates the optical path between the light emitted from the light projecting unit 7 and the reflected light from the subject 3, and the direction of the emitted light in the direction of the subject 3. And deflects the reflected light from the subject 3 in the direction of the polarizing beam splitter 15, and once collects the laser light between the polarizing beam splitter 15 and the polarizing beam splitter 15 and the dichroic mirror 16 for the objective.
- An imaging lens 21 that is arranged between the photodetector 8 and forms an image of the laser beam on the photodetector 8, and a knife edge that is arranged between the light projecting unit 7 and the polarization beam splitter 15 to make the laser beam semicircular.
- a 22 is arranged between the photodetector 8 and forms an image of the laser beam on the photodetector 8 and a knife edge that is arranged between the light projecting unit 7 and the polarization beam splitter 15 to make the laser beam semicircular.
- the light projecting unit 7 includes a reference light source 23 that emits laser light, a laser driving unit 25 that drives the light source, a collimator lens 26 that converts illumination light into parallel light, and the pupil and conjugate position of the objective lens 2.
- a diffraction grating 27 for converting parallel light into a plurality of spot lights arranged in a line on a line.
- the photodetector 8 is connected to the control unit 14 via an amplifier 28 that amplifies the output signal photoelectrically converted by the photodetector 8 and an AZD conversion 30 that AZD converts the signal amplified by the amplifier 28.
- the diffraction grating 27 may be disposed between the knife edge 22 and the polarization beam splitter 15 as long as the diffraction grating 27 is disposed at a position where the reflected light beam from the subject 3 does not pass.
- the photodetector 8 can output each region force signal by dividing the image plane of the light image of the reflected light from the subject 3 into an A region and a B region.
- the A region and the B region are arranged above and below corresponding to the position at which the edge image of the knife edge 22 is projected onto the photodetector 8.
- the control unit 14 performs arithmetic processing of these signals and adjusts the focus position.
- the subject position adjusting means 11 includes a support base 31 on which the subject 3 is placed, an electric revolver 32 that has the objective lens 2 and is rotatable to replace the objective lens 2, and a support base 31.
- a focusing motor 33 that drives up and down, a focusing motor drive unit 35 that drives and controls the motor, an encoder 36 that detects the rotation speed of the focusing motor 33, and a rotation direction and rotation connected to the encoder 36.
- a pulse counter 37 for detecting the quantity.
- the support base 31 is movable in the vertical direction with respect to the electric revolver 32.
- the electric revolver 32 is used for rotating the revolver that rotates the revolver main body 38 so that the revolver body 38 having a mounting hole to which a plurality of objective lenses 2 can be attached and the arbitrary objective lens 2 is inserted into the optical path.
- Revolver motor drive unit 40 that electrically drives motor 39 and revolver rotation motor 39, and repo hole position for detecting which mounting hole position of revolver body 38 is equipped with objective lens 2 And a detection unit 41.
- the aperture means 12 has a plurality of selectable fixed apertures 42 having different aperture diameters arranged on the circumference, and the desired fixed aperture 42 is intermediately imaged between the pair of lenses 17 and 18.
- a fixed diaphragm rotating plate 43 that can be moved to a position, a rotating plate motor 45 that rotationally drives the fixed diaphragm rotating plate 43, and a rotating plate drive unit 46 that drives the motor.
- Japanese Patent Laid-Open No. 2001-296469 discloses a method of projecting laser light according to the multi-spot method by the focus detection optical system 10 and adjustment of the in-focus position of the subject 3 by the subject position adjusting means 11. Etc. can be performed in the same manner as described in
- the spot light on the subject 3 is single. For this reason, most of the reflected light from the spot light becomes scattered light at the step C in the figure and does not return to the photodetector 8, making AF operation impossible.
- the step shown in FIG. 3A as shown in FIG. 3B, only the position of the spot light projected on the subject 3 is in focus, and particularly when using the high-magnification objective lens 2, The subject images at other steps are greatly blurred. Therefore, even if the width between D and E in the figure can be measured, the width between F and G in the figure cannot be measured.
- the optical field 47 generally has a substantially circular shape
- the imaging range 48 has a rectangular shape
- the multi-point spot light L is within the optical field 47.
- the photodetector 8 also receives signals from a plurality of spot lights outside the imaging range 48, signal processing for focusing may be performed under the influence of this portion, and imaging that is actually visible is possible. Images within range 48 may not be in focus sufficiently.
- the electrical signal of the image captured by the CCD 5 is displayed on the monitor by the image generator 60. It is converted into a signal that can be displayed and displayed on the image monitor 61. The observer can check whether he is in focus.
- a spot light switching switch (not shown) arranged in the operation unit 13 is operated, an instruction is issued from the control unit 14 to the rotary plate drive unit 46 to drive the rotary plate motor 45, and a fixed iris
- the rotating plate 43 is rotated, and the fixed stop 42 is selected so that the laser spot light projected onto the subject 3 is disposed within the imaging range 48, and is disposed at the intermediate imaging position described above.
- a plurality of laser spot lights are irradiated and reflected only within the imaging range 48, so that the photodetector 8 has a pattern step or reflection at a position outside the imaging range 48.
- the reflected light is received only within the imaging range 48 that is not affected by the rate, and the focal position is adjusted based on this.
- the control unit detects a signal from the repo hole position detection unit 41, determines the objective lens 2 to be used from this signal, and determines the fixed aperture 42 corresponding to the imaging range of the imaging camera to be used. By selecting, a signal is sent from the control unit to the rotary plate drive unit 46, and the rotary drive unit 46 rotates the rotary plate motor 45 to automatically set the optimum fixed aperture 42. A little.
- control unit may have an image composition function, and the image signal converted by the image generation device 60 and the optical field image created in a pseudo manner may be synthesized and displayed.
- the current aperture status can be displayed so that the observer can manually select the aperture.
- the spot of the laser beam according to the size of the imaging range 48 is provided by disposing the aperture means 12 having an aperture diameter corresponding to the imaging range 48 at the intermediate imaging position.
- the projection length can be limited within the imaging range 48.
- control unit 14 can automatically adjust the pinhole 42 optimum for the imaging range 48 to the intermediate image forming position, and can make a suitable adjustment in a short time.
- the shape of the fixed stop 42 may be configured to shield the outside of the imaging range and the inside of the imaging range in accordance with the purpose. In this case, focus weighting can be performed on the center portion and the peripheral portion of the imaging range. Alternatively, the transmittance may be continuously changed by shielding the outside of the imaging range and directing the force from the center to the periphery!
- the diaphragm means 51 of the microscope AF device 50 has a diaphragm diameter such as a feather diaphragm used in a camera or the like.
- the variable aperture 52 that can be adjusted, the variable aperture motor 53 that drives the variable aperture 52, and the variable aperture drive unit 55 that drives the variable aperture 52 are provided.
- the control unit 56 can adjust the aperture diameter of the variable aperture 52 based on the output signal from the subject position adjusting means 11. Also, CCD5 and later are omitted.
- the control unit 56 detects a signal from the repo hole position detection unit 41 when performing focusing. At this time, the objective lens 2 having a magnification determined in advance for each mounting hole of the revolver body 38 is attached. Therefore, the objective lens 2 currently used is identified by the signal from the repo hole position detector 41.
- the control unit 56 calculates the aperture diameter that falls within the imaging range of the imaging device corresponding to the magnification of the objective lens 2. Alternatively, it may have a memory containing a table of aperture diameters corresponding to the magnification. Then, an instruction is sent from the control unit 56 to the variable aperture drive unit 55 to drive the variable aperture motor 53, and the spot projection length projected onto the subject 3 is substantially the same as the diagonal length of the imaging range 48.
- the aperture diameter of the variable aperture 52 is changed so that
- L-shaped members as shown in FIG. 11 may be moved diagonally by driving means (not shown) as a variable diaphragm.
- the two members may be moved to any position within the imaging range while maintaining the relative positions of the two members.
- the same effect as the first embodiment can be obtained, but it is not necessary to set a plurality of optimum aperture diameters in advance in the imaging range 48.
- the light projection length of the spot can be adjusted arbitrarily, and the focusing operation can be performed more suitably.
- the difference between the third embodiment and the second embodiment is the AF for microscope according to this embodiment.
- the variable aperture 52 of the apparatus 60 is arranged at a position Y between the subject 3 and the objective lens 2.
- variable diaphragm 52 is arranged at a position where the light beam of the laser beam converges, by varying the diaphragm diameter of the variable diaphragm 52, the second embodiment and the second embodiment can be used.
- the spot projection length of the laser light can be more preferably limited to the imaging range 48.
- variable aperture 52 of the microscope AF device 70 is arranged at a position between the imaging lens 21 and the photodetector 8. This is the point.
- variable aperture 52 is arranged at the position where the light beam of the laser beam converges, as in the second and third embodiments.
- the aperture diameter of 52 By varying the aperture diameter of 52, the same effect as in the second and third embodiments can be obtained.
- the subject position adjusting means 11 that adjusts the distance between the subject and the objective lens drives the support base 31 up and down with respect to the electric revolver 32.
- the revolver may be driven up and down.
- the present invention is not affected by the step of the pattern outside the range and the reflectivity when focused, and thus the laser beam is projected only within the range desired to be focused. Since it can be focused, it can be applied to a subject with multiple steps.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/724,416 US20070164194A1 (en) | 2004-09-16 | 2007-03-15 | Observation apparatus with focal position control mechanism |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004269669A JP2006084794A (ja) | 2004-09-16 | 2004-09-16 | 焦点位置制御機構付き観察装置 |
JP2004-269669 | 2004-09-16 |
Publications (1)
Publication Number | Publication Date |
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WO2006038439A1 true WO2006038439A1 (ja) | 2006-04-13 |
Family
ID=36142519
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/016843 WO2006038439A1 (ja) | 2004-09-16 | 2005-09-13 | 焦点位置制御機構付き観察装置 |
Country Status (5)
Country | Link |
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US (1) | US20070164194A1 (ja) |
JP (1) | JP2006084794A (ja) |
CN (1) | CN101019058A (ja) |
TW (1) | TW200619806A (ja) |
WO (1) | WO2006038439A1 (ja) |
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JP2014202565A (ja) * | 2013-04-03 | 2014-10-27 | セイコーNpc株式会社 | 赤外線吸収率の測定における被測定物に対する赤外線光の入射方法 |
WO2017086287A1 (ja) * | 2015-11-17 | 2017-05-26 | 株式会社ニコン | 遮光装置、顕微鏡、及び観察方法 |
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JP4690132B2 (ja) * | 2005-07-13 | 2011-06-01 | オリンパス株式会社 | 焦点検出装置 |
JP4257863B2 (ja) * | 2007-02-13 | 2009-04-22 | 東レエンジニアリング株式会社 | 自動外観検査装置 |
CN101750711B (zh) * | 2008-12-19 | 2011-12-21 | 财团法人工业技术研究院 | 聚焦方法与自动聚焦装置及其侦测模块 |
DK2406679T3 (da) | 2009-03-11 | 2017-04-18 | Sakura Finetek Usa Inc | Autofokusfremgangsmåde og autofokusanordning |
JP2012073285A (ja) * | 2010-09-27 | 2012-04-12 | Olympus Corp | 撮像方法および顕微鏡装置 |
US20120097833A1 (en) * | 2010-10-22 | 2012-04-26 | Industrial Technology Research Institute | Laser scanning device |
US8669507B2 (en) | 2010-10-22 | 2014-03-11 | Industrial Technology Research Institute | Laser scanning device |
TWI428654B (zh) * | 2010-11-23 | 2014-03-01 | Ind Tech Res Inst | 自動聚焦模組與其方法 |
TWI406025B (zh) | 2010-11-25 | 2013-08-21 | Ind Tech Res Inst | 自動聚焦裝置及方法 |
DE102013103971A1 (de) | 2013-04-19 | 2014-11-06 | Sensovation Ag | Verfahren zum Erzeugen eines aus mehreren Teilbildern zusammengesetzten Gesamtbilds eines Objekts |
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JP6335499B2 (ja) * | 2013-12-13 | 2018-05-30 | 株式会社イシダ | 光学検査装置 |
CN103698879B (zh) * | 2013-12-18 | 2016-02-24 | 宁波江丰生物信息技术有限公司 | 一种实时对焦的装置及方法 |
US10007102B2 (en) | 2013-12-23 | 2018-06-26 | Sakura Finetek U.S.A., Inc. | Microscope with slide clamping assembly |
JP6364193B2 (ja) * | 2014-01-23 | 2018-07-25 | 株式会社ニューフレアテクノロジー | 焦点位置調整方法および検査方法 |
JP2016038408A (ja) * | 2014-08-05 | 2016-03-22 | オリンパス株式会社 | オートフォーカス装置、及び、標本観察装置 |
CN104317041B (zh) * | 2014-09-30 | 2016-11-02 | 无锡微焦科技有限公司 | 一种自聚焦光路系统 |
JP6748706B2 (ja) | 2016-03-31 | 2020-09-02 | 三菱重工エンジン&ターボチャージャ株式会社 | ラジアルコンプレッサのケーシング、及びラジアルコンプレッサ |
US11280803B2 (en) | 2016-11-22 | 2022-03-22 | Sakura Finetek U.S.A., Inc. | Slide management system |
KR20220084147A (ko) * | 2019-10-19 | 2022-06-21 | 세큘라이트 제노믹스 유에스, 아이앤씨. | 가상 기준 |
CN115113383B (zh) * | 2022-05-30 | 2023-11-28 | 中国人民解放军国防科技大学 | 一种观测超高真空内被观测物的长镜筒真空显微成像镜头 |
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JP2014202565A (ja) * | 2013-04-03 | 2014-10-27 | セイコーNpc株式会社 | 赤外線吸収率の測定における被測定物に対する赤外線光の入射方法 |
WO2017086287A1 (ja) * | 2015-11-17 | 2017-05-26 | 株式会社ニコン | 遮光装置、顕微鏡、及び観察方法 |
JPWO2017086287A1 (ja) * | 2015-11-17 | 2018-08-30 | 株式会社ニコン | 遮光装置、顕微鏡、及び観察方法 |
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CN101019058A (zh) | 2007-08-15 |
JP2006084794A (ja) | 2006-03-30 |
US20070164194A1 (en) | 2007-07-19 |
TW200619806A (en) | 2006-06-16 |
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