WO2013136909A1 - 荷電粒子線装置用防音カバー及び荷電粒子線装置 - Google Patents
荷電粒子線装置用防音カバー及び荷電粒子線装置 Download PDFInfo
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- WO2013136909A1 WO2013136909A1 PCT/JP2013/053788 JP2013053788W WO2013136909A1 WO 2013136909 A1 WO2013136909 A1 WO 2013136909A1 JP 2013053788 W JP2013053788 W JP 2013053788W WO 2013136909 A1 WO2013136909 A1 WO 2013136909A1
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- soundproof cover
- particle beam
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- cover
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/16—Vessels; Containers
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/20—Means for supporting or positioning the objects or the material; Means for adjusting diaphragms or lenses associated with the support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/26—Electron or ion microscopes; Electron or ion diffraction tubes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/02—Details
- H01J2237/0216—Means for avoiding or correcting vibration effects
Definitions
- the present invention relates to a soundproof cover used for a charged particle beam device or the like, and more particularly to a soundproof cover and a charged particle beam device that can suppress the influence of sound of a specific frequency.
- a soundproof cover is installed to cover the apparatus from the outside as a means for blocking the transmission of the sound wave irradiated to the apparatus for the purpose of preventing the occurrence of an image failure caused by the irradiation of the installation environment sound.
- the soundproof cover is usually formed with a hexahedron structure having upper, lower, left, and upper surfaces in consideration of the property of sound wave wrapping around and further in view of workability and cost reduction.
- Patent Document 1 discloses a technique in which a sound absorbing material is covered with dustproof fibers and attached to the inner surface of the soundproof cover.
- Patent Document 2 discloses a sound absorbing structure including a box member having a large number of small holes.
- Patent Documents 3 and 4 disclose a structure in which a Helmholtz resonator is installed in a sash portion of a double window
- Patent Document 5 discloses a structure in which a Helmholtz resonator is installed in a lower part of a skirt portion of a railway vehicle. Yes.
- a high-resolution charged particle beam apparatus is provided with a soundproof cover as a means for interrupting transmission of sound waves irradiated to the apparatus, thereby improving noise resistance performance of relatively high frequencies.
- noise resistance may be reduced in the low frequency region. This is because, in a general design, a part that is sensitive to vibration is placed near the center of the cover in the device, whereas at a certain frequency, the antinode of the sound pressure of the standing acoustic wave generated in the cover is present. This is caused by oscillating a part sensitive to vibrations by just coming to the center of the cover.
- Patent Document 1 When the soundproof cover of Patent Document 1 is used to deal with vibrations caused by the sound of this specific frequency, the sound absorbing material to be installed becomes thick because the target frequency is low.
- Patent Document 2 it is necessary to open an infinite number of holes having an opening diameter less than or equal to the plate thickness, and it is difficult to perform general punching processing. The production cost may increase.
- Patent Document 3 to Patent Document 5 do not provide a structure such as a shape or an installation location that can efficiently absorb sound by a sound absorbing structure specialized for a frequency that is a problem in the charged particle beam apparatus. .
- a hollow portion forming member that forms a cylindrical body having a wall surface along the inner wall of the soundproof cover is provided. Proposed is a soundproof cover in which one end of a cylindrical body formed by a part forming member is open and the other end of the cylindrical part is closed, and a charged particle beam device surrounded by the soundproof cover.
- the block diagram of a charged particle beam apparatus The figure which shows the frequency characteristic of the noise-proof performance of a charged particle beam apparatus.
- FIG. 1 Another figure explaining the result of the numerical analysis which verifies the effect of a soundproof cover.
- the embodiment described below relates to a charged particle beam apparatus in which image disturbance occurs due to acoustic excitation.
- it relates to a soundproof cover for reducing noise and vibration from the external environment, and is assumed to be used particularly in a clean room.
- the soundproof cover for the high-resolution charged particle beam device installed for the purpose of preventing the occurrence of image failure caused by the environment sound of the installation environment has a uniform noise resistance performance over the entire frequency band.
- a structure that is improved and is realized at low cost without impairing dustproofness that can withstand use of a clean room, which is an installation environment of the charged particle beam device, and ease of opening and closing the cover in consideration of maintenance will be described.
- the present invention relates to a charged particle beam device including an electron gun, a sample chamber, and a detector, and a soundproof cover that covers the outside of the charged particle beam device.
- a charged particle beam device including an electron gun, a sample chamber, and a detector
- a soundproof cover that covers the outside of the charged particle beam device.
- Can be discriminated at a very high resolution and an electron gun and / or detector is disposed at the end of the apparatus, and a sample chamber is provided at the center of the apparatus.
- the soundproof cover has a cylindrical cavity part that is open on one side and closed on the other side with respect to the inner surface. An example in which it is arranged so as to be in the center of the direction or both will be described.
- a hollow portion forming member that forms a cylindrical body having a wall surface along the inner wall of the soundproof cover is provided, and one end of the cylindrical body formed by the hollow portion forming member is opened, and the cylindrical body
- the soundproof cover in which the other end of the cover is closed can efficiently eliminate the influence of sound brought into the cover. Specifically, it is possible to install a sound absorption mechanism having a large sound absorption characteristic at the frequency at which the acoustic standing wave is generated at the position of the antinode of the sound pressure of the acoustic standing wave generated in the cover.
- the soundproof cover described in detail below is particularly effective when applied to a high-resolution charged particle beam apparatus, and can prevent image failure caused by installation environment sound.
- the soundproof cover described below can improve the noise resistance performance evenly over the entire frequency band.
- it can be provided at a low cost without impairing the ease of opening and closing the cover in consideration of dust resistance and maintenance that can withstand the use of a clean room, which is an installation environment of the charged particle beam apparatus.
- the charged particle beam device referred to below is a high-precision scanning electron microscope, transmission electron microscope, length measuring device (CD-SEM), review device, defect inspection device, sample processing device using a charged particle beam, etc. This refers to a device that inspects, observes, and processes, and generally refers to a device in which an image failure occurs due to minute vibrations of the device.
- FIG. 1 is a schematic diagram showing the overall configuration of a transmission electron microscope that is an example of a charged particle beam apparatus 100.
- the transmission electron microscope of FIG. 1 includes a column 101, a converging device 102, a sample chamber 103, a stage 104, a holder 105, a sample 106, a detector 107, a gantry 108, a vibration isolation table 109, and the like. Electrons emitted from 110 (charged particle source) pass through the sample 106 and are detected by the detector 107.
- the trajectory of the electrons emitted from the electron gun 110 is slightly distorted, so that the position where the electrons are transmitted through the sample 106 is changed slightly, and accordingly detection is performed.
- the intensity of electrons detected by the device 107 changes. In this way, by imaging the intensity of the electrons that pass through the sample 106 as light and shade with respect to the corresponding coordinates, an enlarged image of the fine structure of the sample can be obtained.
- the charged particle beam apparatus is an imaging apparatus
- the main performance is resolution.
- a very minute structure is enlarged and displayed, an image failure is caused by a very small disturbance.
- the above-described vibration isolation table 109 is installed to prevent image failure caused by vibration from the floor. As an effect, image failure due to floor vibration is reduced.
- image defects caused by the environmental sound of the charged particle beam apparatus have also become apparent.
- the fact that the frequency characteristic of the allowable sound pressure is convex downward indicates that an image disturbance is likely to occur due to the installation environment sound at this frequency, but this is a charged particle beam device. This is because one of the structures has a portion that easily vibrates at this frequency and is affected by the natural vibration. In the case of a transmission electron microscope, this is generally caused by the natural vibration of the holder 105, and the frequency at which the allowable sound pressure falls often coincides with the natural vibration frequency of the holder 105.
- a soundproof cover 200 as shown in FIG. 3 is recently installed for a high-resolution charged particle beam apparatus. Is done.
- the installation of the soundproof cover 200 improves the noise resistance performance in a wide range at a high frequency, and the allowable sound pressure drop due to the natural vibration of each part of the structure of the charged particle beam device described above is also improved.
- the installation of the soundproof cover 200 improves the noise resistance performance in the high frequency region, while the noise resistance performance deteriorates in a certain limited frequency band in the low frequency region. It has been confirmed.
- an acoustic standing wave as shown in FIG. 5 is generated in the cover.
- a part sensitive to vibration is arranged near the center of the cover in the apparatus. This is caused by the fact that the sound pressure wave of the acoustic standing wave generated in the cover is vibrated at the center of the cover, so that the part sensitive to vibration is well excited.
- the embodiment described below provides a structure that effectively reduces the acoustic standing wave in the cover by taking the opposite side that the acoustic standing wave generated in the cover is generated at a frequency determined by the dimensions of the cover.
- FIG. 6 is an example of a cross-sectional view of the configuration of the charged particle beam apparatus and the soundproof cover according to the present embodiment
- FIG. 7 is a perspective view of a portion indicated by a broken line.
- the opening 211 of the cylindrical cavity 210 becomes an antinode of the sound pressure of the acoustic standing wave with respect to the inner surface of the cover. It is installed on the inner surface of the side wall of the soundproof cover so that it comes to the upper and lower inner sides of the cover in the vertical direction.
- the soundproof panel 7 is installed on the inner wall of a soundproof cover that surrounds the charged particle beam device, and a plurality of cylindrical bodies having wall surfaces along the inner wall of the soundproof cover are arranged along the inner wall of the soundproof cover. Is formed.
- the soundproof panel is formed so that the closed side of the cylindrical body is connected to the closed side of another cylindrical body.
- the soundproof panel serves as the cavity forming member, but is not limited thereto, and may be another cylindrical body that can exhibit the effects described below.
- the transmission electron microscope among other charged particle beam apparatuses, has a structure in which the portion of the holder 105 is weak against vibrations, and thus has a lower noise resistance than the surrounding frequency in the vicinity of the natural frequency of the holder 105.
- the drop in the noise resistance performance at this frequency is improved by the installation of the soundproof cover 200.
- the sound pressure is increased near the center of the cover where the holder is placed. The sound standing wave is generated and the noise resistance performance is deteriorated.
- the generation frequency of the acoustic standing wave (acoustic mode) which becomes the antinode of the sound pressure at the center of the cover where this holder is arranged depends on the shape and dimensions of the cover.
- h is [m]
- it is generated at 340 / h [Hz].
- the cover height is 2 [m]
- the frequency generated in the vertical three-stage antinode mode is 170 [Hz].
- the tube with one closed and the other opened when a sound with a wavelength four times the length of the tube arrives, re-radiates the sound of the opposite phase of the incoming sound wave to It is known to cancel and reduce (sound absorption). This is called a sound absorbing tube.
- the length is 1 [m]
- the frequency at which this sound absorbing tube exhibits the most sound absorbing effect is 340/4 l [Hz].
- the opening 211 should be installed at the position of the antinode of the sound pressure. In the vertical three-stage antinode mode, the upper surface of the cover, the lower surface of the cover, and the center of the cover in the height direction Install so that the opening comes to the front.
- the first space that is in contact with the top plate the second space that is located below the first space and includes the central region in the height direction of the soundproof cover, and the lower space than the second space.
- Two soundproof panels illustrated in FIG. 7 are provided on each of the four side walls so that the openings are located in the third space including the bottom.
- the soundproof panel of this example is formed so that four cylindrical bodies are arranged in the height direction, and an opening is located in each of the first to third spaces.
- the second space is located in the approximate center in the height direction of the soundproof cover, and is a region where the sample holder (sample stand) of the transmission electron microscope is located.
- the cylindrical cavities 210 functioning as sound absorbing tubes do not overlap each other, and as a result, the vertical direction generated in the cover It is possible to provide a soundproof cover structure that can effectively suppress the three-stage antinode mode and can improve the noise resistance performance evenly in the entire frequency band.
- FIG. 8 shows an analysis model created to verify the effect of the structure shown in the first embodiment. Only the soundproof cover is modeled, and the cover has a height of 2 m, a width of 1 m, and a depth of 1.4 m corresponding to a general transmission electron microscope. Regarding the installation of the internal sound absorption tube, when the sound absorption tube is not installed (Model 1), when equivalent to Example 1 (Model 2), when only the lower 1/4 of Example 1 is installed (Model 3) The length of the sound absorbing tube is the same as that of the first embodiment, but four types of cases where the position of the opening is different (model 4) were prepared.
- FIG. 9 shows the result of calculating the sound leaked and transmitted to the inside of the cover.
- the figure shows a cross section of the longitudinal sound pressure level at 175 Hz (the unit of contour is [dB]).
- the longitudinal three-stage antinode mode is generated at the frequency calculated as described above. I understand that.
- the acoustic standing wave is effectively suppressed in the model 2 corresponding to the first embodiment.
- the suppression of the standing wave is not sufficient, and in the model 4, the suppression effect is small enough to confirm the vertical three-stage antinode mode.
- FIG. 10 shows the frequency characteristics of sound pressure for each model shown above, and shows the average sound pressure at the sound pressure evaluation points shown in the upper diagram of FIG. This can be explained in the same manner as described above, and it is shown that the model 2 corresponding to the first embodiment can reduce the noise in the cover most at the frequency.
- the sound absorbing tube is installed using not only the side surfaces but also the inner surface and floor surface of the ceiling, so that acoustic standing waves in the vertical three-stage antinode mode and the horizontal two-stage antinode mode can be suppressed.
- FIG. 11 shows the length direction of the cylindrical hollow portion 210 of the first embodiment shown in FIG. 6 for the purpose of effectively using the inner surface and floor surface of the ceiling of the soundproof cover 200, and the cover height in the cover. It is installed in the side of the cover instead of the direction. In this way, the inner surface and floor surface of the ceiling of the soundproof cover 200 can be effectively used, and the in-cover lateral two-stage belly mode can be reduced although the contribution is small. Furthermore, it is expected that image defects can be reduced.
- FIG. 12 shows an example in which a perforated plate is installed in the opening 211 of the cylindrical cavity 210 having the structure shown in FIG. 6 and described in the first embodiment.
- FIG. 13 in the structure shown in FIG. 6 and described in the first embodiment, the cylindrical cavity portion 210 is again installed on the inner surface of the cylindrical cavity portion 210 installed on the inner surface of the soundproof cover 200. Is shown. In this way, the cylindrical cavity may be installed in multiple stages, and the length of the cylindrical cavity need not be the same as that of the first stage. Moreover, even when the soundproof cover ceiling surface or floor surface as in the second embodiment shown in FIG.
- the multi-stage structure of the cylindrical hollow portion is not arranged directly on the inner surface of the soundproof cover, but, for example, is suspended from the soundproof cover ceiling surface using a holding tool.
- a holding tool for example, is suspended from the soundproof cover ceiling surface using a holding tool.
- the soundproof cover itself needs to be easily opened and closed for the convenience of maintenance, there is a restriction that a structure cannot be installed on the inner surface.
- the multi-stage structure of the cylindrical hollow portion shown in Example 4 is configured to be hung from the ceiling surface using a holding tool so that it is not directly installed on the inner surface of the soundproof cover. It is good also as a structure.
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Abstract
Description
101 カラム
102 収束器
103 試料室
104 ステージ
105 ホルダ
106 試料
107 検出器
108 架台
109 除振台
110 電子銃
200 防音カバー
210 筒状空洞部
211 筒状空洞部の開口部
212 多孔板
Claims (15)
- 荷電粒子線装置を包囲する防音カバーにおいて、
当該防音カバーの内壁に沿った壁面を持つ筒状体を形成する空洞部形成部材を備え、当該空洞部形成部材によって形成される筒状体の一端は開放され、当該筒状部の他端は閉じられていることを特徴とする荷電粒子線装置用防音カバー。 - 請求項1において、
前記空洞部形成部材は、複数の前記筒状体を、前記防音カバーの内壁に沿って配列するように、当該筒状体を形成することを特徴とする荷電粒子線装置用防音カバー。 - 請求項1において、
前記空洞形成部材は、前記防音カバーの側壁に前記筒状体を形成し、前記開口が当該防音カバーの天板と接する第1の空間、当該防音カバーの高さ方向の中心領域を含む第2の空間、及び底部を含む第3の空間の少なくとも1つに位置するように、前記筒状体を形成していることを特徴とする荷電粒子線装置用防音カバー。 - 請求項3において、
前記筒状体は、前記側壁の高さ方向に、少なくとも4つ配列され、天板に一番近い筒状体は、前記第1の空間に開口を持ち、天板に2番目と3番目に近い筒状体は、前記第2の空間に開口を持ち、天板から4番目に近い筒状体は、前記第3の空間に開口を持つことを特徴とする荷電粒子線装置用防音カバー。 - 請求項4において、前記筒状体の空洞部の長さを、前記防音カバーの高さの1/4程度としたことを特徴とする荷電粒子線装置用防音カバー。
- 請求項1において、
前記開口に多孔板を設置したことを特徴とする荷電粒子線装置用防音カバー。 - 請求項1において、
前記空洞形成部材は、前記防音カバーの天板に前記筒状体を形成することを特徴とする荷電粒子線装置用防音カバー。 - 請求項1において、
前記空洞形成部材は、前記防音カバーの底部に前記筒状体を形成することを特徴とする荷電粒子線装置用防音カバー。 - 請求項1において、
前記空洞部形成部材は、前記筒状体を、前記防音カバーの内側、外側、あるいはその両方に対して、多段重ねて形成することを特徴とする荷電粒子線装置用防音カバー。 - 請求項1において、
前記空洞部形成部材は、前記筒状体を、前記防音カバーの内側の空間に対して、一段もしくは多段重ねて形成することを特徴とする荷電粒子線装置用防音カバー。 - 荷電粒子源と、当該荷電粒子源から放出される荷電粒子線が照射される試料を保持する試料台を備えた荷電粒子線装置において、
当該荷電粒子線装置を包囲する防音カバーを有し、当該防音カバーは、当該防音カバーの内壁に沿った壁面を持つ筒状体を形成する空洞部形成部材を備え、当該空洞部形成部材によって形成される筒状体の一端は開放され、当該筒状部の他端は閉じられていることを特徴とする荷電粒子線装置。 - 請求項11において、
前記空洞部形成部材は、複数の前記筒状体を、前記防音カバーの内壁に沿って配列するように、当該筒状体を形成することを特徴とする荷電粒子線装置。 - 請求項11において、
前記空洞形成部材は、前記防音カバーの側壁に前記筒状体を形成し、前記開口が、当該防音カバーの天板と接する第1の空間、当該防音カバーの高さ方向の中心領域を含む第2の空間、及び底部を含む第3の空間の少なくとも1つに位置するように、前記筒状体を形成していることを特徴とする荷電粒子線装置。 - 請求項11において、
前記空洞形成部材は、前記防音カバーの側壁に前記筒状体を形成し、前記開口が、当該防音カバーの天板と接する第1の空間、当該防音カバーの高さ方向の中心領域を含む第2の空間、及び底部を含む第3の空間の内、少なくとも第2の空間に位置するように、前記筒状体を形成していることを特徴とする荷電粒子線装置。 - 請求項14において、
前記試料台は、前記第2の空間に配置されることを特徴とする荷電粒子線装置。
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DE112013000944.7T DE112013000944T8 (de) | 2012-03-13 | 2013-02-18 | Störschalldämmende Abdeckung für Ladungsteilchenstrahlvorrichtung und Ladungsteilchenstrahlvorrichtung |
US14/378,688 US20150041676A1 (en) | 2012-03-13 | 2013-02-18 | Soundproof cover for charged-particle beam device, and charged-particle beam device |
CN201380007222.XA CN104081491A (zh) | 2012-03-13 | 2013-02-18 | 带电粒子线装置用隔音罩以及带电粒子线装置 |
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JP2017050046A (ja) | 2015-08-31 | 2017-03-09 | 株式会社日立ハイテクノロジーズ | 荷電粒子線装置 |
KR102329264B1 (ko) * | 2018-02-22 | 2021-11-18 | 어플라이드 머티어리얼스, 인코포레이티드 | 디스플레이 제조를 위한 기판에 대한 자동화된 임계 치수 측정을 위한 방법, 디스플레이 제조를 위한 대면적 기판을 검사하는 방법, 디스플레이 제조를 위한 대면적 기판을 검사하기 위한 장치, 및 그 동작 방법 |
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WO2011158458A1 (ja) * | 2010-06-16 | 2011-12-22 | 株式会社 日立ハイテクノロジーズ | 荷電粒子線装置および防音カバー |
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NL1036433A1 (nl) * | 2008-01-31 | 2009-08-03 | Asml Netherlands Bv | Lithographic apparatus, method and device manufacturing method. |
JP5537386B2 (ja) * | 2010-11-09 | 2014-07-02 | 株式会社日立ハイテクノロジーズ | 荷電粒子線装置 |
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JPH06222778A (ja) * | 1993-01-21 | 1994-08-12 | Towa Seisakusho:Kk | 吸音ゴム |
JP2006079870A (ja) * | 2004-09-08 | 2006-03-23 | Hitachi High-Technologies Corp | 荷電粒子線装置 |
JP2008009014A (ja) * | 2006-06-28 | 2008-01-17 | Kobe Steel Ltd | 多孔質防音構造体 |
JP2008138505A (ja) * | 2006-11-02 | 2008-06-19 | Kobe Steel Ltd | 吸音構造体 |
JP2009220652A (ja) * | 2008-03-14 | 2009-10-01 | Tokai Rubber Ind Ltd | 防音カバー |
WO2011158458A1 (ja) * | 2010-06-16 | 2011-12-22 | 株式会社 日立ハイテクノロジーズ | 荷電粒子線装置および防音カバー |
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US20150041676A1 (en) | 2015-02-12 |
JP5838106B2 (ja) | 2015-12-24 |
JP2013191333A (ja) | 2013-09-26 |
DE112013000944T8 (de) | 2014-12-24 |
CN104081491A (zh) | 2014-10-01 |
DE112013000944T5 (de) | 2014-12-11 |
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