WO2016002719A1 - 自動試料作製装置 - Google Patents
自動試料作製装置 Download PDFInfo
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- WO2016002719A1 WO2016002719A1 PCT/JP2015/068688 JP2015068688W WO2016002719A1 WO 2016002719 A1 WO2016002719 A1 WO 2016002719A1 JP 2015068688 W JP2015068688 W JP 2015068688W WO 2016002719 A1 WO2016002719 A1 WO 2016002719A1
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- sample
- sample piece
- needle
- computer
- piece
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
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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
- H01J37/30—Electron-beam or ion-beam tubes for localised treatment of objects
- H01J37/302—Controlling tubes by external information, e.g. programme control
- H01J37/3023—Programme control
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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
- H01J37/30—Electron-beam or ion-beam tubes for localised treatment of objects
- H01J37/31—Electron-beam or ion-beam tubes for localised treatment of objects for cutting or drilling
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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
- H01J37/30—Electron-beam or ion-beam tubes for localised treatment of objects
- H01J37/317—Electron-beam or ion-beam tubes for localised treatment of objects for changing properties of the objects or for applying thin layers thereon, e.g. for ion implantation
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- 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
- H01J2237/20—Positioning, supporting, modifying or maintaining the physical state of objects being observed or treated
- H01J2237/202—Movement
- H01J2237/20278—Motorised movement
- H01J2237/20285—Motorised movement computer-controlled
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- 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
- H01J2237/20—Positioning, supporting, modifying or maintaining the physical state of objects being observed or treated
- H01J2237/208—Elements or methods for movement independent of sample stage for influencing or moving or contacting or transferring the sample or parts thereof, e.g. prober needles or transfer needles in FIB/SEM systems
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- 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
- H01J2237/30—Electron or ion beam tubes for processing objects
- H01J2237/317—Processing objects on a microscale
- H01J2237/3174—Etching microareas
- H01J2237/31745—Etching microareas for preparing specimen to be viewed in microscopes or analyzed in microanalysers
Definitions
- the present invention relates to an automatic sample preparation apparatus.
- sampling refers to a shape that is suitable for various processes such as observation, analysis, and measurement by extracting a sample piece produced by irradiating the sample with a charged particle beam. Refers to processing. More specifically, “sampling” refers to transferring a sample piece formed by processing of irradiating a sample with a focused ion beam to a sample piece holder.
- the present invention has been made in view of the above circumstances, and an automatic sample capable of automating an operation of extracting a sample piece formed by processing of irradiating a sample with an ion beam from the sample and transferring it to a sample piece holder. It is an object to provide a manufacturing apparatus.
- An automatic sample preparation device is an automatic sample preparation device that automatically prepares a sample piece from a sample, the charged particle beam irradiation optical system for irradiating a charged particle beam, and the sample A sample stage for holding and transferring the sample piece separated and extracted from the sample, and a sample piece holder fixing for holding a sample piece holder to which the sample piece is transferred A base, a gas supply unit for irradiating a gas for forming a deposition film by the charged particle beam, and at least an image of the sample piece held in the sample piece transfer means obtained in advance by the charged particle beam And a computer for controlling the charged particle beam irradiation optical system, the sample piece moving means, and the gas supply unit so as to transfer the sample piece to the sample piece holder.
- the computer extracts an edge from the image of the sample piece holder by the charged particle beam and obtains it by template matching using the template of the sample piece holder. Based on the positional information obtained, the movement of the sample piece transfer means or the sample stage is controlled so as to transfer the sample piece to the sample piece holder.
- An automatic sample preparation device is an automatic sample preparation device that automatically prepares a sample piece from a sample, and includes at least a focused ion beam irradiation optical system that irradiates a focused ion beam; A sample stage on which the sample is placed and moved, a sample piece transfer means for holding and transporting the sample piece separated and extracted from the sample, and a sample piece for holding a sample piece holder to which the sample piece is transferred A holder fixing base, a gas supply unit for irradiating a gas for forming a deposition film by the focused ion beam, and at least the sample piece held by the sample piece transfer means from different directions depending on the previously acquired focused ion beam.
- the focused ion beam irradiation optical system, the sample piece transfer means, and the gas supply unit so as to transfer the sample piece to the sample piece holder based on the image of Comprising a computer for controlling the.
- the computer extracts an edge from the image of the sample piece holder by the focused ion beam, and obtains it by template matching using the template of the sample piece holder. Based on the positional information obtained, the movement of the sample piece transfer means or the sample stage is controlled so as to transfer the sample piece to the sample piece holder.
- the computer extracts at least the template of the sample piece held by the sample piece transfer means by extracting an edge from the image.
- the movement of the sample piece transfer means or the sample stage is controlled so as to transfer the sample piece to the sample piece holder based on the positional information obtained by template matching using the template.
- the computer has no structure in the background of the sample piece held at least by the sample piece transfer means To obtain the image.
- the computer moves the sample piece so that there is no structure in the background of the sample piece held by the sample piece transfer means.
- the movement of the sample stage is instructed, if there is actually no structure in the background, at least the sample piece connected to the sample piece moving means is moved to the initial position.
- the computer rotates the sample piece moving unit so that the sample piece is in a predetermined posture. Get an image.
- the computer holds the sample and the sample held by the sample piece moving means based on the image.
- the distance to the piece holder is acquired, and the movement of the sample piece moving means or the sample stage is controlled so as to move the sample piece to a predetermined position of the sample piece holder based on the distance.
- the computer finally moves the sample piece in advance only by movement in a plane parallel to the sample stage. Move to the determined position of the sample piece holder.
- the computer shapes the sample held by the sample piece transfer means before the template is created.
- the computer sets the shaping position according to the distance from the sample piece moving means.
- the computer rotates the sample piece moving means for holding the sample piece so as to be in a predetermined posture. Next, eccentricity correction is performed.
- the automatic sample preparation apparatus of the present invention it is possible to automate the operation of extracting a sample piece formed by processing a sample with an ion beam and transferring it to a sample piece holder. Based on at least the sample piece holder, the sample piece transfer means, and the previously acquired image of the sample piece, the sample piece can be transferred to a predetermined position of the sample piece holder with high accuracy.
- FIG. 1 It is a figure which shows the needle which stopped moving around the attachment position of the sample piece of the sample stand in the image data obtained by the electron beam of the automatic sample preparation device according to the embodiment of the present invention. It is a figure which shows the process irradiation frame for connecting the sample piece connected to the needle in the image data obtained by the focused ion beam of the automatic sample preparation apparatus which concerns on embodiment of this invention to a sample stand. It is a figure which shows the cutting process position for cut
- FIG. 1 is a configuration diagram of an automatic sample preparation apparatus 10 including a charged particle beam apparatus 10a according to an embodiment of the present invention.
- An automatic sample preparation apparatus 10 according to an embodiment of the present invention includes a charged particle beam apparatus 10a.
- the charged particle beam apparatus 10 a includes a sample chamber 11 that can be maintained in a vacuum state, a stage 12 that can fix a sample S and a sample piece holder P inside the sample chamber 11, and a stage 12. And a drive mechanism 13 for driving the motor.
- the charged particle beam apparatus 10 a includes a focused ion beam irradiation optical system 14 that irradiates an irradiation target within a predetermined irradiation region (that is, a scanning range) inside the sample chamber 11 with a focused ion beam (FIB).
- the charged particle beam apparatus 10 a includes an electron beam irradiation optical system 15 that irradiates an irradiation target within a predetermined irradiation region inside the sample chamber 11 with an electron beam (EB).
- a focused ion beam irradiation optical system 14 that irradiates an irradiation target within a predetermined irradiation region (that is, a scanning range) inside the sample chamber 11 with a focused ion beam (FIB).
- the charged particle beam apparatus 10 a includes an electron beam irradiation optical system 15 that irradiates an irradiation target within a predetermined irradiation region inside the sample chamber 11 with an electron beam
- the charged particle beam device 10a includes a detector 16 that detects secondary charged particles (secondary electrons, secondary ions, etc.) R generated from an irradiation target by irradiation with a charged particle beam (that is, a focused ion beam or an electron beam). I have.
- the charged particle beam apparatus 10a includes a gas supply unit 17 that supplies the gas G to the surface of the irradiation target.
- the charged particle beam apparatus 10a takes out the sample piece Q from the sample S fixed to the stage 12, holds the sample piece Q and places the sample piece Q on the sample piece holder P by driving the needle 18 and driving the needle 18.
- a needle drive mechanism 19 for conveying.
- the needle 18 and the needle drive mechanism 19 may be collectively referred to as sample piece moving means.
- the charged particle beam apparatus 10 a includes a display device 20 that displays image data based on the secondary charged particles R detected by the detector 16, a computer 21, and an input device 22.
- the irradiation targets of the focused ion beam irradiation optical system 14 and the electron beam irradiation optical system 15 are the sample S fixed to the stage 12, the sample piece Q, the needle 18 existing in the irradiation region, and the like.
- the charged particle beam apparatus 10a can execute various processes (such as etching process) by sputtering and formation of a deposition film by irradiating the surface of the irradiation target with a focused ion beam while scanning. It is.
- the charged particle beam apparatus 10a can perform processing for forming a sample piece Q (for example, a thin piece sample, a needle-like sample, etc.) for transmission observation with a transmission electron microscope from the sample S.
- the charged particle beam apparatus 10a can perform processing to convert the sample piece Q installed in the sample piece holder P into a thin film having a desired thickness (for example, 10 to 20 nm) suitable for transmission observation with a transmission electron microscope. It is.
- the charged particle beam apparatus 10a can perform observation of the surface of the irradiation target by irradiating the surface of the irradiation target such as the sample piece Q and the needle 18 while scanning the focused ion beam or the electron beam.
- FIG. 2 is a plan view showing a sample piece Q formed on the sample S of the charged particle beam apparatus 10a according to the embodiment of the present invention.
- the sample piece Q is etched so that the peripheral portions on the side portion side and the bottom portion side are removed by removing the support portion Qa connected to the sample S.
- the sample piece Q is cantilevered by the sample S by the support portion Qa.
- the sample chamber 11 can be evacuated to a desired vacuum state by an evacuation device (not shown) and can maintain a desired vacuum state.
- the stage 12 holds the sample S.
- the stage 12 includes a holder fixing base 12a that holds the sample piece holder P.
- FIG. 3 is a plan view of the sample piece holder P
- FIG. 4 is a side view.
- the sample piece holder P includes a semicircular plate-like base 32 having a notch 31 and a sample stage 33 fixed to the notch 31.
- the base 32 is formed in a circular plate shape having a diameter of 3 mm and a thickness of 50 ⁇ m, for example, from metal.
- the sample stage 33 is formed from, for example, a silicon wafer by a MEMS process, and is attached to the notch 31 with a conductive adhesive.
- the sample stage 33 has a comb-teeth shape, and includes a plurality of (for example, five, etc.) columnar portions (pillars) 34 having different widths that are spaced apart and project.
- the sample pieces Q held by the plurality of columnar portions 34 are stored in the computer 21 in association with the sample pieces Q transferred to the respective columnar portions 34. Can be recognized without making a mistake.
- Each columnar part 34 is formed, for example, with a tip part thickness of 10 ⁇ m or less, and holds the sample piece Q attached to the tip surface.
- the driving mechanism 13 is accommodated in the sample chamber 11 while being connected to the stage 12, and displaces the stage 12 with respect to a predetermined axis in accordance with a control signal output from the computer 21.
- the drive mechanism 13 includes a moving mechanism 13a that moves the stage 12 in parallel along an X axis and a Y axis that are parallel to the horizontal plane and orthogonal to each other, and a vertical Z axis that is orthogonal to the X axis and the Y axis. .
- the drive mechanism 13 includes a tilt mechanism 13b that rotates the stage 12 around the X axis or the Y axis, and a rotation mechanism 13c that rotates the stage 12 around the Z axis.
- the focused ion beam irradiation optical system 14 causes a beam emitting unit (not shown) inside the sample chamber 11 to face the stage 12 at a position above the stage 12 in the irradiation region in the vertical direction, and the optical axis in the vertical direction.
- the sample chamber 11 is fixed in parallel. Thereby, it is possible to irradiate the irradiation target such as the sample S, the sample piece Q, and the needle 18 existing in the irradiation region with the focused ion beam from the upper side to the lower side in the vertical direction.
- the focused ion beam irradiation optical system 14 includes an ion source 14a that generates ions, and an ion optical system 14b that focuses and deflects ions extracted from the ion source 14a.
- the ion source 14 a and the ion optical system 14 b are controlled according to a control signal output from the computer 21, and the irradiation position and irradiation conditions of the focused ion beam are controlled by the computer 21.
- the ion source 14a is, for example, a liquid metal ion source using liquid gallium or the like, a plasma ion source, a gas field ion source, or the like.
- the ion optical system 14b includes, for example, a first electrostatic lens such as a condenser lens, an electrostatic deflector, and a second electrostatic lens such as an objective lens.
- the electron beam irradiation optical system 15 causes a beam emitting portion (not shown) inside the sample chamber 11 to face the stage 12 in a tilt direction inclined by a predetermined angle with respect to the vertical direction of the stage 12 in the irradiation region, and the optical axis is set.
- the sample chamber 11 is fixed in parallel to the tilt direction.
- the electron beam irradiation optical system 15 includes an electron source 15a that generates electrons, and an electron optical system 15b that focuses and deflects electrons emitted from the electron source 15a.
- the electron source 15 a and the electron optical system 15 b are controlled according to a control signal output from the computer 21, and the irradiation position and irradiation condition of the electron beam are controlled by the computer 21.
- the electron optical system 15b includes, for example, an electromagnetic lens and a deflector.
- the arrangement of the electron beam irradiation optical system 15 and the focused ion beam irradiation optical system 14 is changed, and the electron beam irradiation optical system 15 is set in a vertical direction, and the focused ion beam irradiation optical system 14 is set in a tilt direction inclined by a predetermined angle in the vertical direction. You may arrange.
- the detector 16 detects the intensity of secondary charged particles (such as secondary electrons and secondary ions) R emitted from the irradiation target when the irradiation target such as the sample S and the needle 18 is irradiated with the focused ion beam or the electron beam. (That is, the amount of secondary charged particles) is detected, and information on the detected amount of secondary charged particles R is output.
- the detector 16 is arranged at a position where the amount of the secondary charged particles R can be detected inside the sample chamber 11, for example, a position obliquely above the irradiation target such as the sample S in the irradiation region. It is fixed to.
- the gas supply unit 17 is fixed to the sample chamber 11 with the gas injection unit (not shown) facing the stage 12 inside the sample chamber 11.
- the gas supply unit 17 deposits an etching gas for selectively accelerating the etching of the sample S by the focused ion beam according to the material of the sample S, and a deposit such as a metal or an insulator on the surface of the sample S.
- a deposition gas for forming a film and the like can be supplied to the sample S.
- the gas supply unit 17 performs etching by supplying an etching gas such as xenon fluoride for the Si-based sample S and water for the organic-based sample S to the sample S together with the focused ion beam irradiation. Selectively promote.
- the gas supply unit 17 supplies a compound gas deposition gas containing, for example, phenanthrene, platinum, carbon, tungsten, or the like to the sample S together with the focused ion beam irradiation, thereby removing the deposition gas from the deposition gas.
- the decomposed solid component is deposited on the surface of the sample S.
- the needle drive mechanism 19 is housed inside the sample chamber 11 with the needle 18 connected, and displaces the needle 18 in accordance with a control signal output from the computer 21.
- the needle drive mechanism 19 is provided integrally with the stage 12. For example, when the stage 12 is rotated around the tilt axis (that is, the X axis or the Y axis) by the tilt mechanism 13 b, the needle drive mechanism 19 moves integrally with the stage 12.
- the needle drive mechanism 19 includes a moving mechanism (not shown) that moves the needle 18 in parallel along each of the three-dimensional coordinate axes, and a rotation mechanism (not shown) that rotates the needle 18 around the central axis of the needle 18. I have.
- This three-dimensional coordinate axis is independent of the orthogonal three-axis coordinate system of the stage 12 of the sample S.
- the orthogonal three-axis coordinate system of the stage 12 including a two-dimensional coordinate axis parallel to the surface of the stage 12, when the surface of the stage 12 is tilted or rotated, the coordinate system of the needle 18 is tilted or rotated.
- the computer 21 is disposed outside the sample chamber 11 and is connected to a display device 20 and an input device 22 such as a mouse and a keyboard for outputting a signal corresponding to an input operation by an operator.
- the computer 21 comprehensively controls the operation of the charged particle beam apparatus 10a by a signal output from the input device 22 or a signal generated by a preset automatic operation control process.
- the computer 21 converts the detection amount of the secondary charged particles R detected by the detector 16 while scanning the irradiation position of the charged particle beam into a luminance signal associated with the irradiation position.
- the computer 21 generates image data indicating the shape of the irradiation target based on the two-dimensional position distribution of the detected amount of the secondary charged particles R.
- the computer 21 detects the absorption current flowing through the needle 18 while scanning the irradiation position of the charged particle beam, and thereby the absorption current image data indicating the shape of the needle 18 by the two-dimensional position distribution of the absorption current. Is generated.
- the computer 21 causes the display device 20 to display a screen for executing operations such as enlargement, reduction, movement, and rotation of each image data together with each generated image data.
- the computer 21 causes the display device 20 to display a screen for performing various settings such as mode selection and processing setting in automatic sequence control.
- the charged particle beam apparatus 10a according to the embodiment of the present invention has the above-described configuration. Next, the operation of the charged particle beam apparatus 10a will be described.
- an automatic sample sampling operation performed by the computer 21, that is, an operation of automatically moving the sample piece Q formed in advance by processing the sample S with a charged particle beam (focused ion beam) to the sample piece holder P will be described. .
- FIG. 5 is a flowchart showing the operation of the charged particle beam apparatus 10a according to the embodiment of the present invention.
- the computer 21 performs mode selection such as presence / absence of an attitude control mode, which will be described later, and machining settings (setting of machining positions, dimensions, etc.) and the like in accordance with an input from the operator (step S01).
- the computer 21 executes a template creation process of the columnar part (pillar) 34.
- the computer 21 creates a template of pillars (pillars) 34 at the beginning of the sampling process.
- the computer 21 creates a template for each columnar part (pillar) 34.
- the computer 21 obtains the coordinates of the columnar part (pillar) 34 and creates a template as a set, and performs an inspection by determining the shape of the columnar part (pillar) 34 by template matching.
- the computer 21 stores, for example, edge information or CAD information in advance as a template of the columnar part (pillar) 34 used for template matching.
- the computer 21 determines the shape of the columnar part (pillar) 34 based on the template matching score. For example, when the columnar part (pillar) 34 is not a predetermined shape, the computer 21 is set to use the next columnar part (pillar) 34. To do.
- the computer 21 performs position registration processing of the sample piece holder P installed on the holder fixing base 12a of the stage 12 by the operator (step S02).
- the computer 21 drives the stage 12 by the drive mechanism 13 as a rough adjustment operation, and aligns the irradiation region at the position where the sample stage 33 is attached in the sample piece holder P.
- the computer 21 uses a template created in advance from the design shape of the sample stage 33 from each image data generated by irradiation with a charged particle beam (focused ion beam and electron beam).
- a charged particle beam focused ion beam and electron beam
- the computer 21 stores (registers) the extracted position coordinates of each columnar section 34 as the attachment position of the sample piece Q.
- the computer 21 sequentially performs this position registration process by the number of sample pieces Q for which automatic sample sampling is performed.
- the computer 21 confirms in advance that the proper sample stage 33 actually exists by performing the position registration process of the sample piece holder P prior to the movement of the sample piece Q described later.
- the computer 21 stores the position coordinates of each sample piece holder P and the image data of the corresponding sample piece holder P as a code for each sample piece holder P. Record with number. Further, the computer 21 stores (registers) a code number and image data corresponding to the position coordinates of each columnar portion 34 of each sample piece holder P. Thereby, when producing several tens of sample pieces Q, the computer 21 calls a specific columnar portion 34 of a specific sample piece holder P to which each sample piece Q is attached within the field of view of the charged particle beam. Can do.
- the computer 21 In this position registration process, if the sample piece holder P itself or the columnar portion 34 is deformed or damaged and the sample piece Q is not attached, the computer 21 Along with the coordinates, the image data, and the code number, “unusable” (the sample piece Q cannot be attached) is also registered. As a result, the computer 21 skips the “unusable” sample piece holder P or column 34 when moving the sample piece Q described later, and attaches it to the normal sample piece holder P or column 34. Can do.
- the computer 21 recognizes a reference mark Ref formed on the sample S at the time of execution of automatic processing for forming the sample piece Q on the sample S in advance using image data generated by irradiation of the charged particle beam onto the sample S. To do.
- the computer 21 stores in advance information on the relative positional relationship between the processing irradiation frame F and the reference mark Ref when the sample piece Q is formed on the sample S by irradiation with the focused ion beam.
- the computer 21 recognizes the position of the sample piece Q from the relative positional relationship between the known reference mark Ref and the sample piece Q, and aligns the sample piece Q (step S03). ).
- the computer 21 drives the stage 12 by the drive mechanism 13, and the angle corresponding to the posture control mode so that the posture of the sample piece Q becomes a predetermined posture (for example, a posture suitable for taking out by the needle 18).
- the stage 12 is rotated around the Z axis by the amount (step S04).
- the computer 21 recognizes the reference mark Ref using image data generated by irradiating the sample S with the charged particle beam.
- the computer 21 recognizes the position of the sample piece Q from the relative positional relationship between the known reference mark Ref and the sample piece Q, and aligns the sample piece Q (step S05).
- the computer 21 moves the needle 18 to the initial setting position by the needle driving mechanism 19.
- the initial setting position is, for example, a predetermined position within a preset visual field region, and is a predetermined position around the sample piece Q that has been aligned within the visual field region.
- the computer 21 After moving the needle 18 to the initial setting position, the computer 21 lowers the nozzle 17a at the tip of the gas supply unit 17 from the standby position vertically above the stage 12 to a predetermined position around the sample piece Q (step S06). .
- the computer 21 can accurately grasp the position of the sample piece Q using the reference mark Ref formed on the sample S when the automatic processing for forming the sample piece Q is performed when the needle 18 is moved. Even three-dimensional movement can be performed appropriately. Since the reference mark Ref is a mark indicating a processing position reference (for example, a drift correction mark), the position of the reference mark Ref is unchanged even when the shape of the sample piece Q is changed by processing.
- the computer 21 can move the needle 18 with high accuracy using the reference mark Ref with respect to the sample piece Q formed with reference to the reference mark Ref.
- the computer 21 performs the following steps S07 to S11 as a process for bringing the needle 18 into contact with the sample piece Q.
- the computer 21 switches to the absorption current image mode and recognizes the position of the needle 18 (step S07).
- the computer 21 detects the absorption current flowing through the needle 18 by irradiating the needle 18 with the charged particle beam while scanning the irradiation position, and the absorption current image data indicating the two-dimensional position distribution of the absorption current with respect to a plurality of different planes. Generate.
- the computer 21 acquires absorption current image data on the XY plane (a plane perpendicular to the optical axis of the focused ion beam) by irradiation with the focused ion beam, and XYZ plane (a plane perpendicular to the optical axis of the electron beam) by irradiation with the electron beam. ) Image data.
- the computer 21 detects the tip position of the needle 18 in the three-dimensional space using the respective absorption current image data acquired from two different directions.
- the computer 21 uses the detected tip position of the needle 18 to drive the stage 12 by the drive mechanism 13 and sets the tip position of the needle 18 to the center position (field center) of the preset field area. May be.
- the computer 21 uses the detected tip position of the needle 18 to obtain a template matching template (reference image data) for the tip shape of the needle 18 (step S08).
- FIG. 6 is a diagram showing a template at the tip of the needle 18 obtained by the focused ion beam
- FIG. 7 is a diagram showing a template at the tip of the needle 18 obtained by the electron beam.
- the computer 21 drives the stage 12 by the drive mechanism 13 and irradiates the needle 18 with a charged particle beam (each of a focused ion beam and an electron beam) while scanning the irradiation position with the sample piece Q retracted from the visual field region. To do.
- the computer 21 acquires each image data indicating the position distribution in a plurality of different planes of the secondary charged particles R emitted from the needle 18 by irradiation with the charged particle beam.
- the computer 21 acquires image data on the XY plane by irradiation with the focused ion beam, and acquires image data on the XYZ plane (a plane perpendicular to the optical axis of the electron beam) by irradiation with the electron beam.
- the computer 21 acquires image data based on the focused ion beam and the electron beam, and stores it as a template (reference image data).
- the computer 21 uses the image data actually acquired immediately before moving the needle 18 by coarse adjustment and fine adjustment as the reference image data, it is possible to perform highly accurate pattern matching regardless of the shape of the needle 18. . Further, since the computer 21 retracts the stage 12 and acquires each image data in a state where there is no complicated structure in the background, a template (reference image) that can clearly grasp the shape of the needle 18 excluding the influence of the background. Data).
- the computer 21 uses pre-stored image acquisition conditions such as magnification, brightness, and contrast in order to increase the recognition accuracy of the object. Further, the computer 21 may use the absorption current image data as a reference image instead of using the image data of the secondary charged particles R as a reference image. In this case, the computer 21 may acquire each absorption current image data for two different planes without driving the stage 12 and retracting the sample piece Q from the visual field region.
- the computer 21 executes needle movement (coarse adjustment) in which the needle 18 is moved by the needle drive mechanism 19 (step S09).
- the computer 21 uses each image data generated by irradiation of the focused ion beam and electron beam with respect to the sample S, and the reference mark Ref (described above) formed on the sample S by irradiation of the focused ion beam in advance when the sample piece Q is formed. (See FIG. 2).
- the computer 21 sets the movement target position AP of the needle 18 using the recognized reference mark Ref.
- the computer 21 sets the movement target position AP to a position required for performing processing for connecting the needle 18 and the sample piece Q by the deposition film, and is relative to the processing irradiation frame F when the sample piece Q is formed. A predetermined positional relationship is associated.
- the computer 21 stores information on the relative positional relationship between the processing irradiation frame F and the reference mark Ref when the sample piece Q is formed on the sample S by irradiation with the focused ion beam. Note that the computer 21 may set the reference mark Ref, the processing irradiation frame F, and the movement target position AP, which are correlated with each other, in advance when the sample piece Q is formed or the like, or may be different depending on an appropriate combination. The timing may be set.
- the computer 21 sets a reference mark Ref, a processing irradiation frame F, and a movement target position AP, and stores them in association with each other. Using the recognized reference mark Ref, the computer 21 uses the relative positional relationship between the reference mark Ref, the processing irradiation frame F, and the movement target position (predetermined position on the sample piece Q) AP, and the tip of the needle 18. The position is moved in the three-dimensional space toward the movement target position AP. When moving the needle 18 three-dimensionally, for example, the computer 21 first moves the needle 18 in the X direction and the Y direction, and then moves it in the Z direction.
- the computer 21 can accurately grasp the position of the sample piece Q using the reference mark Ref when moving the needle 18, and the needle 18 can be moved even if it is three-dimensionally moved relative to the movement target position AP. It can be moved properly. Since the position of the reference mark Ref does not change even when the shape of the sample piece Q changes due to processing, the computer 21 uses the movement target position AP associated with the reference mark Ref to move the needle 18 to the sample piece. It can be moved with respect to Q with high accuracy.
- FIG. 8 is a view showing the tip of the needle 18 in the image data obtained by the focused ion beam of the charged particle beam apparatus according to the embodiment of the present invention.
- FIG. 9 is a diagram showing the tip of the needle 18 in the image data obtained by the electron beam.
- the direction of the needle 18 is different because the positional relationship among the focused ion beam irradiation optical system 14, the electron beam irradiation optical system 15 and the detector 16 and the display direction of the image by secondary electrons.
- This shows a situation where the same needle 18 is viewed in different observation directions.
- two needles 18a and 18b are displayed, but in order to show the state of needle movement, the image data of the needle tip position before and after the movement is displayed superimposed on the same field of view. It is the same needle 18.
- the computer 21 uses the reference mark Ref and moves the tip position of the needle 18 to the movement target using the relative positional relationship among the reference mark Ref, the processing irradiation frame F, and the movement target position AP. Although it moved to the position AP in the three-dimensional space, it is not limited to this.
- the computer 21 uses the relative positional relationship between the reference mark Ref and the movement target position AP without using the processing irradiation frame F, and moves the tip position of the needle 18 toward the movement target position AP in the three-dimensional space. It may be moved.
- the computer 21 executes needle movement (fine adjustment) for moving the needle 18 by the needle drive mechanism 19 (step S10).
- the computer 21 repeats pattern matching using the reference image data, and moves the needle 18 while grasping the tip position of the needle 18.
- the computer 21 irradiates the needle 18 with a charged particle beam (each of a focused ion beam and an electron beam), and repeatedly acquires image data of the charged particle beam.
- the computer 21 acquires the tip position of the needle 18 by performing pattern matching using the reference image data on the acquired image data.
- the computer 21 moves the needle 18 in the three-dimensional space according to the acquired tip position and movement target position of the needle 18.
- the computer 21 performs a process of stopping the movement of the needle 18 (step S11).
- the computer 21 moves the needle 18 in a state where the irradiation region including the movement target position is irradiated with the charged particle beam, and when the absorbed current flowing through the needle 18 exceeds a predetermined current, the needle driving mechanism 19 drives the needle 18.
- the computer 21 arranges the tip position of the needle 18 at the movement target position close to the side portion on the opposite side of the support portion Qa among the side portions of the sample piece Q.
- FIGS. 10 and 11 show this state, and show the tip of the needle 18 and the sample piece Q in the image data obtained by the focused ion beam of the automatic sample preparation apparatus 10 according to the embodiment of the present invention (FIG. 10).
- FIG. 11 is a diagram (FIG. 11) showing the tip of the needle 18 and the sample piece Q in the image data obtained by the electron beam. 10 and 11, as in FIGS. 8 and 9, in addition to the observation direction being different between the focused ion beam and the electron beam, the observation magnification is different, but the observation object and the needle 18 are the same.
- the computer 21 performs a process of connecting the needle 18 to the sample piece Q (step S12).
- the computer 21 designates a preset connection processing position using the reference mark Ref formed on the sample S.
- the computer 21 sets the connection processing position at a position away from the sample piece Q by a predetermined interval.
- the computer 21 sets the upper limit of the predetermined interval to 1 ⁇ m, and preferably sets the predetermined interval to 100 nm or more and 200 nm or less.
- the computer 21 irradiates the irradiation area including the processing irradiation frame R1 set at the connection processing position with a focused ion beam for a predetermined time while supplying gas to the sample piece Q and the tip surface of the needle 18 by the gas supply unit 17. Supply.
- the computer 21 connects the sample piece Q and the needle 18 by the deposition film.
- this step S12 since the computer 21 is connected by the deposition film without bringing the needle 18 into contact with the sample piece Q, there is an advantage that it is possible to prevent the occurrence of problems such as damage due to the contact. Furthermore, it is possible to prevent the needle 18 from being cut when the needle 18 and the sample piece Q are separated by cutting in a later step. Further, even when the needle 18 vibrates, it is possible to suppress the vibration from being transmitted to the sample piece Q. Furthermore, even when the movement of the sample piece Q due to the creep phenomenon of the sample S occurs, it is possible to suppress the occurrence of excessive strain between the needle 18 and the sample piece Q.
- FIG. 12 shows this state, and the processing irradiation frame R1 including the connection processing position of the needle 18 and the sample piece Q in the image data obtained by the focused ion beam of the automatic sample preparation device 10 according to the embodiment of the present invention.
- FIG. 12 shows this state, and the processing irradiation frame
- the computer 21 When connecting the needle 18 to the sample piece Q, the computer 21 sets a connection posture suitable for each approach mode selected when the sample piece Q connected to the needle 18 is later transferred to the sample piece holder P. To do.
- the computer 21 sets a relative connection posture between the needle 18 and the sample piece Q in correspondence with each of a plurality of (for example, three) different approach modes described later.
- the computer 21 may determine the connection state by the deposition film by detecting the change in the absorption current of the needle 18.
- the computer 21 determines that the sample piece Q and the needle 18 are connected by the deposition film according to the change in the absorption current of the needle 18, the formation of the deposition film is stopped regardless of whether or not a predetermined time has elapsed. May be.
- the computer 21 performs a process of cutting the support portion Qa between the sample piece Q and the sample S (step S13).
- the computer 21 uses the reference mark formed on the sample S to specify a preset cutting position T1 of the support portion Qa.
- the computer 21 separates the sample piece Q from the sample S by irradiating the focused ion beam to the cutting processing position T1 for a predetermined time.
- FIG. 13 shows this state, and shows the cutting position T1 of the support portion Qa of the sample S and the sample piece Q in the image data obtained by the focused ion beam of the automatic sample preparation device 10 according to the embodiment of the present invention.
- the computer 21 determines whether or not the sample piece Q has been separated from the sample S by detecting conduction between the sample S and the needle 18.
- the computer 21 detects the conduction between the sample S and the needle 18 after the end of the cutting process, that is, after the cutting of the support portion Qa between the sample piece Q and the sample S at the cutting position T1 is completed. Determines that the sample piece Q is not separated from the sample S.
- the computer 21 determines that the sample piece Q has not been separated from the sample S, the computer 21 notifies that the separation of the sample piece Q and the sample S has not been completed by display or sound, and thereafter Stop execution of the process.
- the computer 21 does not detect the conduction between the sample S and the needle 18, it determines that the sample piece Q has been separated from the sample S, and continues to execute the subsequent processing.
- the computer 21 performs a needle retraction process (step S14).
- the computer 21 raises the needle 18 upward by a predetermined distance (for example, 5 ⁇ m) by the needle drive mechanism 19 (that is, the positive direction in the Z direction).
- FIG. 14 shows this state, and shows a state in which the needle 18 to which the sample piece Q is connected in the image data obtained by the electron beam of the automatic sample preparation device 10 according to the embodiment of the present invention is retracted. is there.
- the computer 21 performs stage saving processing (step S15). As shown in FIG. 15, the computer 21 lowers the stage 12 by a predetermined distance (for example, 5 mm) downward in the vertical direction (that is, the negative direction in the Z direction) by the drive mechanism 13.
- a predetermined distance for example, 5 mm
- the computer 21 lowers the stage 12 by a predetermined distance, and then raises the nozzle of the gas supply unit 17 to a standby position above the stage 12 in the vertical direction.
- FIG. 15 shows this state, and the stage 12 is retracted with respect to the needle 18 to which the sample piece Q in the image data obtained by the electron beam of the automatic sample preparation device 10 according to the embodiment of the present invention is connected. It is a figure which shows a state.
- the computer 21 executes an attitude control process as necessary.
- the computer 21 rotates the sample piece Q taken out from the sample S, and fixes the sample piece Q in a state where the top and bottom or the left and right of the sample piece Q are changed to the sample piece holder P.
- the computer 21 fixes the sample piece Q so that the surface of the original sample S in the sample piece Q is perpendicular to or parallel to the end face of the columnar portion 34.
- the computer 21 can secure the posture of the sample piece Q suitable for the finishing process to be executed later, and can reduce the influence of the curtain effect generated during the finishing process.
- the computer 21 corrects the rotation so that the sample piece Q does not deviate from the real field of view by performing eccentricity correction when rotating the needle 18.
- the computer 21 shapes the sample piece Q by irradiation with a focused ion beam as necessary.
- the shaped sample piece Q is shaped so that the end surface in contact with the columnar portion 34 is substantially parallel to the end surface of the columnar portion 34.
- the computer 21 performs a shaping process such as cutting a part of the sample piece Q before creating a template to be described later.
- the computer 21 sets the processing position of this shaping process based on the distance from the needle 18.
- the computer 21 facilitates edge extraction from a template, which will be described later, and ensures the shape of the sample piece Q suitable for finishing processing to be executed later.
- the computer 21 drives the needle 18 by the needle drive mechanism 19 and rotates the needle 18 by an angle corresponding to the posture control mode so that the posture of the sample piece Q becomes a predetermined posture.
- the posture control mode is a mode for controlling the sample piece Q to a predetermined posture.
- the needle 18 is approached at a predetermined angle with respect to the sample piece Q, and the needle 18 connected to the sample piece Q is moved to a predetermined angle.
- the posture of the sample piece Q is controlled by rotating in the direction.
- the computer 21 performs eccentricity correction when the needle 18 is rotated.
- FIGS. 16 and 17 are views showing a state of the needle 18 to which the sample piece Q is connected in the approach mode in which the needle 18 is rotated at an angle of 0 °.
- FIG. 16 is a diagram showing a state of the needle 18 to which the sample piece Q is connected in the image data obtained by the focused ion beam of the automatic sample preparation device 10 according to the embodiment of the present invention.
- FIG. 17 is a diagram illustrating a state of the needle 18 to which the sample piece Q is connected in the image data obtained by the electron beam of the automatic sample preparation device 10.
- FIGS. 18 and 19 are views showing a state of the needle 18 to which the sample piece Q is connected in the approach mode in which the needle 18 is rotated at a rotation angle of 90 °.
- FIG. 18 is a diagram showing a state in which the needle 18 connected to the sample piece Q in the image data obtained by the focused ion beam of the automatic sample preparation device 10 according to the embodiment of the present invention is rotated by 90 °.
- FIG. 18 is a diagram showing a state in which the needle 18 connected to the sample piece Q in the image data obtained by the focused ion beam of the automatic sample preparation device 10 according to the embodiment of the present invention is rotated by 90 °.
- FIG. 19 is a diagram illustrating a state in which the needle 18 connected to the sample piece Q in the image data obtained by the electron beam of the automatic sample preparation device 10 is rotated by 90 °.
- the computer 21 sets a posture state suitable for transferring the sample piece Q to the sample piece holder P with the needle 18 rotated by 90 °.
- 20 and 21 are views showing the state of the needle 18 to which the sample piece Q is connected in the approach mode in which the rotation angle of the needle 18 is 180 °.
- FIG. 20 is a diagram illustrating a state in which the needle 18 connected to the sample piece Q in the image data obtained by the focused ion beam of the automatic sample preparation device 10 according to the embodiment of the present invention is rotated 180 °.
- FIG. 21 is a diagram showing a state in which the needle 18 connected to the sample piece Q in the image data obtained by the electron beam of the automatic sample preparation device 10 is rotated by 90 °.
- the computer 21 sets a posture state suitable for transferring the sample piece Q to the sample piece holder P with the needle 18 rotated by 180 °. Yes.
- the relative connection posture between the needle 18 and the sample piece Q is set in advance to a connection posture suitable for each approach mode when the needle 18 is connected to the sample piece Q in the sample piece pick-up process described above. .
- step S ⁇ b> 16 the computer 21 uses the positions of the needles 18 at different angles of at least three points when the needles 18 are rotated around the central axis by the rotation mechanism (not shown) of the needle driving mechanism 19.
- the eccentric locus of the needle 18 is approximated to an ellipse.
- the computer 21 approximates the eccentric locus of the needle 18 to an ellipse or a circle by calculating a change in the position of the needle 18 at each of three or more different angles with a sine wave. Then, the computer 21 corrects the positional deviation of the needle 18 at every predetermined angle using the eccentric locus of the needle 18.
- the computer 21 executes a template creation process of the needle and the sample piece.
- the computer 21 acquires the template after moving the needle 18 to a place where there is no structure in the background of the needle 18 and the sample piece Q connected to each other.
- the computer 21 automatically recognizes the edge (contour) of the needle 18 and the sample piece Q from the image data obtained by each of the focused ion beam and the electron beam
- the computer 21 uses the background structure of the needle 18 and the sample piece Q. Prevent misidentification of edges.
- the computer 21 rotates the needle 18 to which the sample piece Q is fixed as necessary (that is, the posture in which the sample piece Q is connected to the columnar part (pillar) 34 of the sample stage 33) and the sample.
- a template for a piece Q is created. Accordingly, the computer 21 recognizes the edges (contours) of the needle 18 and the sample piece Q three-dimensionally from the image data obtained by the focused ion beam and the electron beam according to the rotation of the needle 18. Note that the computer 21 recognizes the edges (contours) of the needle 18 and the sample piece Q from the image data obtained by the focused ion beam without requiring an electron beam in the approach mode in which the rotation angle of the needle 18 is 0 °. May be.
- the computer 21 instructs the drive mechanism 13 or the needle drive mechanism 19 to move the needle 18 to a place where there is no structure in the background of the needle 18 and the sample piece Q, the needle 18 comes to the actually instructed place. If not, the observation magnification is set low and the needle 18 is searched. If the computer 21 is not found, the computer 21 initializes the position coordinates of the needle 18 and moves the needle 18 to the initial position.
- the computer 21 acquires a template for matching (reference image data) for the sample piece Q and the tip shape of the needle 18 to which the sample piece Q is connected (step S17).
- the computer 21 irradiates the needle 18 with a charged particle beam (a focused ion beam and an electron beam) while scanning the irradiation position.
- the computer 21 acquires each image data indicating the position distribution in a plurality of different planes of the secondary charged particles R emitted from the needle 18 by irradiation with the charged particle beam.
- the computer 21 acquires image data on the XY plane by irradiation with the focused ion beam, and acquires image data on the XYZ plane (a plane perpendicular to the optical axis of the electron beam) by irradiation with the electron beam.
- the computer 21 stores each image data acquired from two different directions as a template (reference image data).
- the computer 21 uses the sample piece Q actually formed by the focused ion beam processing and the image data actually acquired for the needle 18 to which the sample piece Q is connected as the reference image data. Regardless of the shape of the needle 18, highly accurate pattern matching can be performed.
- the computer 21 has a suitable magnification, brightness, contrast, etc. stored in advance in order to increase the accuracy of recognizing the shape of the sample piece Q and the needle 18 to which the sample piece Q is connected. Use image acquisition conditions.
- the computer 21 performs a needle retraction process (step S18).
- the computer 21 raises the needle 18 by a predetermined distance upward in the vertical direction (that is, the positive direction in the Z direction) by the needle drive mechanism 19.
- FIG. 22 is a diagram showing the attachment position U of the sample piece Q of the columnar portion 34 in the image data obtained by the focused ion beam of the automatic sample preparation device 10 according to the embodiment of the present invention.
- FIG. 23 is a diagram illustrating the attachment position U of the sample piece Q of the columnar portion 34 in the image data obtained by the electron beam of the automatic sample preparation device 10.
- the computer 21 moves the stage 12 by the drive mechanism 13 to adjust the horizontal position of the sample piece holder P, and the angle corresponding to the posture control mode so that the posture of the sample piece holder P becomes a predetermined posture.
- the stage 12 is rotated by the amount (step S20).
- the computer 21 lowers the nozzle 17a of the gas supply unit 17 from the standby position vertically above the stage 12 toward the machining position.
- the computer 21 executes a pillar template matching process.
- the computer 21 performs template matching in order to accurately recognize the positions of the plurality of columnar portions (pillars) 34 of the comb-shaped sample base 33.
- the computer 21 performs template matching on each image data obtained by irradiation of each of the focused ion beam and the electron beam, using a template for each columnar part (pillar) 34 created in advance in the pillar template creation step.
- the computer 21 instructs the drive mechanism 13 to move the stage 12, if the stage 12 does not actually move to the predetermined position, the computer 21 initializes the position coordinates of the stage 12 and moves the stage 12. Move to the initial position.
- the computer 21 selects the sample piece Q to be attached when there is a columnar part (pillar) 34 in which a problem is recognized.
- the columnar part (pillar) 34 in which the problem is recognized is changed to the adjacent columnar part (pillar) 34.
- the computer 21 displays the extracted edge on the display device 20 when extracting an edge (contour) from a predetermined region (region including at least the columnar portion (pillar) 34) of the image data in template matching. Since the columnar portion (pillar) 34 has a sharp edge (contour) as shown in FIGS. 22 and 23, template matching with high matching accuracy can be performed.
- the computer 21 acquires the image data again.
- the computer 21 recognizes the mounting position of the sample piece Q stored in step S02 described above using each image data generated by irradiation with each of the focused ion beam and electron beam (step S21). .
- the computer 21 drives the stage 12 by the drive mechanism 13 so that the attachment position recognized by the electron beam irradiation matches the attachment position recognized by the focused ion beam irradiation.
- the computer 21 drives the stage 12 by the drive mechanism 13 so that the attachment position U of the sample piece Q coincides with the visual field center (processing position) of the visual field region.
- the computer 21 performs the following steps S22 to S25 as a process of bringing the sample piece Q connected to the needle 18 into contact with the sample piece holder P.
- the computer 21 recognizes the position of the needle 18 (step S22).
- the computer 21 detects the absorption current flowing through the needle 18 by irradiating the needle 18 with the charged particle beam while scanning the irradiation position, and the absorption current image data indicating the two-dimensional position distribution of the absorption current with respect to a plurality of different planes. Generate.
- the computer 21 acquires absorption current image data on the XY plane by irradiation with the focused ion beam, and acquires image data on the XYZ plane (a plane perpendicular to the optical axis of the electron beam) by irradiation with the electron beam.
- the computer 21 detects the tip position of the needle 18 in the three-dimensional space using the respective absorption current image data acquired for two different planes.
- the computer 21 uses the detected tip position of the needle 18 to drive the stage 12 by the drive mechanism 13 and sets the tip position of the needle 18 to the center position (field center) of the preset field area. May be.
- the computer 21 executes a sample piece mounting process.
- the computer 21 performs template matching in order to accurately recognize the position of the sample piece Q connected to the needle 18.
- the computer 21 uses the template of the needle 18 and the sample piece Q, which are connected in advance in the template preparation process of the needle and the sample piece, in each image data obtained by each irradiation of the focused ion beam and the electron beam. Perform template matching.
- the computer 21 extracts an edge (contour) from a predetermined region (region including at least the needle 18 and the sample piece Q) of the image data in the template matching, the computer 21 displays the extracted edge on the display device 20. .
- the computer 21 acquires the image data again. Then, the computer 21 includes, in each image data obtained by irradiation of the focused ion beam and the electron beam, a template of the needle 18 and the sample piece Q that are connected to each other, and a columnar portion to which the sample piece Q is attached ( The distance between the sample piece Q and the columnar portion (pillar) 34 is measured based on template matching using the template of the pillar 34. Then, the computer 21 finally moves the sample piece Q to the columnar part (pillar) 34 to which the sample piece Q is attached only by movement in a plane parallel to the stage 12.
- the computer 21 executes needle movement in which the needle 18 is moved by the needle driving mechanism 19 (step S23). Based on template matching using the template of the needle 18 and the sample piece Q and the template of the columnar part (pillar) 34 in each image data obtained by irradiation of each of the focused ion beam and the electron beam, the computer 21 The distance between the piece Q and the columnar part (pillar) 34 is measured. The computer 21 moves the needle 18 toward the attachment position in the three-dimensional space according to the measured relative distance.
- the computer 21 executes a sample piece mounting process.
- the computer 21 terminates the deposition when the conduction between the columnar part (pillar) 34 and the needle 18 is detected.
- the computer 21 stops the needle 18 with a gap between the columnar part (pillar) 34 and the sample piece Q.
- the computer 21 sets the gap to 1 ⁇ m or less, and preferably sets the gap to 100 nm or more and 200 nm or less. When this gap is 500 nm or more, the time required for connection between the columnar part (pillar) 34 and the sample piece Q by the deposition film becomes longer than a predetermined value.
- the computer 21 may open the gap after the sample piece Q is once brought into contact with the columnar portion (pillar) 34. Further, the computer 21 may provide a gap by detecting an absorption current image of the columnar part (pillar) 34 and the needle 18 instead of detecting conduction between the columnar part (pillar) 34 and the needle 18. The computer 21 detects the conduction between the columnar part (pillar) 34 and the needle 18 or the absorption current image of the columnar part (pillar) 34 and the needle 18, whereby the sample piece Q is placed on the columnar part (pillar) 34.
- the computer 21 After the transfer, the presence or absence of separation of the sample piece Q and the needle 18 is detected. In addition, when the computer 21 cannot detect conduction between the columnar part (pillar) 34 and the needle 18, the computer 21 performs processing so as to detect an absorption current image of the columnar part (pillar) 34 and the needle 18. Switch. Further, when the computer 21 cannot detect conduction between the columnar part (pillar) 34 and the needle 18, the computer 21 stops the transfer of the sample piece Q, and separates the sample piece Q from the needle 18. You may perform the needle trimming process mentioned later.
- the computer 21 performs a process of stopping the movement of the needle 18 (step S24).
- 24 and 25 show this state.
- FIG. 24 shows the needle 18 stopped moving around the mounting position U of the sample piece Q of the columnar portion 34 in the image data obtained by the focused ion beam of the automatic sample preparation device 10 according to the embodiment of the present invention.
- FIG. 25 shows the needle 18 that has stopped moving around the attachment position U of the sample piece Q of the columnar portion 34 in the image data obtained by the electron beam of the automatic sample preparation device 10 according to the embodiment of the present invention.
- the apparent upper end portion of the sample piece Q is positioned so as to align with the upper end portion of the columnar portion (pillar) 34, which is convenient when the sample piece Q is additionally processed in a later step.
- the needle 18 shown in FIG. 24 stops moving so as to provide a distance L1 from the side surface of the columnar portion (pillar) 34 to the sample piece Q.
- the computer 21 performs a process of connecting the sample piece Q connected to the needle 18 to the columnar part (pillar) 34 (step S25).
- the computer 21 sets the processing irradiation frame R ⁇ b> 2 so as to include the edge of the columnar part (pillar) 34 where the attachment position of the sample piece Q is set.
- the computer 21 irradiates the irradiation region including the processing irradiation frame R2 with a focused ion beam over a predetermined time while supplying the gas to the surface of the sample piece Q and the columnar portion (pillar) 34 by the gas supply unit 17.
- the computer 21 may determine the connection state of the deposition film DM1 by detecting a change in the absorption current of the needle 18.
- the computer 21 determines that the sample piece Q and the columnar portion (pillar) 34 are connected by the deposition film DM1 according to the change in the absorption current of the needle 18, the deposition is performed regardless of whether or not a predetermined time has passed. The formation of the film DM1 may be stopped.
- the computer 21 performs a process of cutting the deposition film DM2 that connects the needle 18 and the sample piece Q (step S26).
- FIG. 26 shows this state, and the deposition film DM2 that connects the needle 18 and the sample piece Q in the image data obtained by the focused ion beam of the automatic sample preparation device 10 according to the embodiment of the present invention is cut.
- It is a figure which shows the cutting process position T2 for performing.
- the computer 21 is separated from the side surface of the columnar portion (pillar) 34 by a predetermined distance (that is, the sum of the distance L1 from the side surface of the columnar portion (pillar) 34 to the sample piece Q and the size L2 of the sample piece Q) L. This position is set as the cutting position T2.
- the computer 21 separates the needle 18 from the sample piece Q by irradiating the focused ion beam to the cutting position T2 for a predetermined time.
- FIG. 27 shows this state, and shows a state where the needle 18 in the image data obtained by the focused ion beam of the automatic sample preparation device 10 according to the embodiment of the present invention is separated from the sample piece Q.
- the computer 21 may cut a part of the sample piece Q instead of cutting the deposition film DM2 that connects the needle 18 and the sample piece Q. .
- the computer 21 may separate the deposition film DM2 and the needle 18 together with a part of the sample piece Q from the sample piece Q (that is, a part other than the cut part).
- the computer 21 determines whether or not the needle 18 has been separated from the sample piece Q by detecting the conduction between the sample piece holder P and the needle 18.
- the computer 21 detects the conduction between the sample piece holder P and the needle 18 after the end of the cutting process, that is, after the cutting of the deposition film between the needle 18 and the sample piece Q at the cutting position T2 is completed. In this case, it is determined that the needle 18 is not separated from the sample stage 33.
- the computer 21 determines that the needle 18 is not separated from the sample piece holder P
- the computer 21 notifies the user that the separation of the needle 18 and the sample piece Q has not been completed by display or sound, and thereafter. Stop execution of the process.
- the computer 21 does not detect conduction between the sample piece holder P and the needle 18, the computer 21 determines that the needle 18 has been disconnected from the sample piece Q, and continues the subsequent processing.
- the computer 21 performs a needle retraction process (step S27).
- the computer 21 raises the needle 18 upward by a predetermined distance (for example, 5 ⁇ m) by the needle drive mechanism 19 (that is, the positive direction in the Z direction).
- FIG. 28 and FIG. 29 show this state, and the state in which the needle 18 is retracted upward from the sample piece Q is obtained by the focused ion beam of the automatic sample preparation device 10 according to the embodiment of the present invention. It is an image (FIG. 28), and is an image (FIG. 29) obtained by an electron beam.
- the computer 21 performs stage saving processing (step S28).
- the computer 21 lowers the stage 12 by a predetermined distance (for example, 5 mm) downward in the vertical direction (that is, the negative direction in the Z direction) by the drive mechanism 13. After lowering the stage 12 by a predetermined distance, the computer 21 moves the nozzle 17a at the tip of the gas supply unit 17 away from the current position.
- a predetermined distance for example, 5 mm
- the computer 21 moves the nozzle 17a at the tip of the gas supply unit 17 away from the current position.
- the computer 21 executes a needle trimming process.
- the computer 21 performs trimming of the needle 18 after sampling in the automatic sample sampling, that is, after the sample piece Q separated and extracted from the sample S by the needle 18 is separated from the needle 18. Accordingly, the computer 21 repeatedly uses the needle 18 when separating and extracting the sample piece Q from the sample S.
- the computer 21 removes the deposition film DM2 attached to the needle 18 by etching using a focused ion beam.
- the computer 21 performs template matching on each image data obtained by irradiation of each of the focused ion beam and the electron beam, using the template of the needle 18 created in advance in the template creation process of the needle.
- the computer 21 moves the needle 18 to a place where there is no structure in the background of the needle 18 and then acquires each image data by irradiation with the focused ion beam and the electron beam.
- the computer 21 displays the extracted edge on the display device 20 when extracting an edge (contour) from a predetermined region of the image data (region including at least the tip of the needle 18) in the template matching.
- the computer 21 initializes the position coordinates of the needle 18 and moves the needle 18 to the initial position, and then places the structure where there is no structure in the background of the needle 18. The needle 18 is moved.
- the computer 21 determines that an abnormality such as a deformation has occurred in the shape of the needle 18 when an abnormality occurs in the template matching process.
- the automatic sample sampling is finished.
- the computer 21 may perform the needle trimming process every time automatic sample sampling is performed, and the automatic sample sampling process can be stabilized by periodically performing the needle trimming process.
- the computer 21 recognizes the tip position of the needle 18 using each image data generated by irradiation of each of the focused ion beam and the electron beam, and then sharpens the tip of the needle 18. (Step S29).
- the computer 21 rotates the needle 18 around the central axis by the rotation mechanism of the needle drive mechanism 19 to perform etching at a plurality of different specific rotation positions.
- the computer 21 performs image recognition of the tip shape of the needle 18 by pattern matching using the reference image acquired in step S08 described above, edge detection, or the like.
- the computer 21 sets the processing frame 40 so that the tip shape of the needle 18 becomes an ideal predetermined shape set in advance, and etching is performed according to the processing frame 40.
- the processing frame 40 sets an ideal distal end position C by linearly approximating, for example, a portion on the proximal end side from the distal end of the needle 18.
- FIGS. 30 and 31 show this state, and show the tip shape of the needle 18 in the image data obtained by the focused ion beam of the automatic sample preparation device 10 according to the embodiment of the present invention (FIG. 30).
- the tip shape of the needle 18 in the image data obtained by the beam is shown (FIG. 31).
- the computer 21 easily recognizes the needle 18 by pattern matching when the needle 18 is driven in a three-dimensional space by matching the tip shape of the needle 18 with a predetermined ideal shape set in advance. The position of the needle 18 in the three-dimensional space can be detected with high accuracy.
- the computer 21 moves the needle 18 to the initial setting position by the needle drive mechanism 19 (step S30).
- the automatic sample sampling operation is thus completed.
- the computer 21 can perform an unattended sampling operation by continuously operating the above-described steps 01 to 30.
- the sample piece Q can be produced without manual operation by the operator.
- each beam irradiation optical system 14 at least based on the template obtained in advance of the sample piece holder P, the needle 18, and the sample piece Q, 15. Since each drive mechanism 13 and 19 and the gas supply part 17 are controlled, the operation
- the precision of template matching using a template can be improved, and the sample piece Q can be transferred to the sample piece holder P with high accuracy based on position information obtained by template matching. Furthermore, since the columnar part (pillar) 34 of the sample stage 33 formed by the MEMS process has a sharp edge (contour), template matching with high matching accuracy can be performed.
- the drive mechanisms 13 and 19 can be returned to the normal state. Furthermore, since the template according to the attitude
- the edge cannot be extracted for a predetermined region in the image data of at least the sample piece holder P, the needle 18 and the sample piece Q, the image data is acquired again, so that the template is accurately created. be able to. Furthermore, since the sample piece Q is finally moved to the position of the predetermined sample piece holder P only by movement in a plane parallel to the stage 12, the sample piece Q can be transferred appropriately. Furthermore, since the sample piece Q held by the needle 18 is shaped before the template is created, the accuracy of edge extraction at the time of template creation can be improved, and the sample piece Q suitable for finishing processing to be executed later can be improved. The shape can be secured. Furthermore, since the position of the shaping process is set according to the distance from the needle 18, the shaping process can be performed with high accuracy. Further, when the needle 18 holding the sample piece Q is rotated so as to have a predetermined posture, the positional deviation of the needle 18 can be corrected by eccentricity correction.
- the computer 21 detects the relative position of the needle 18 with respect to the reference mark Ref when the sample piece Q is formed, whereby the needle with respect to the sample piece Q is detected.
- the relative positional relationship of 18 can be grasped.
- the computer 21 detects the relative position of the needle 18 with respect to the position of the sample piece Q, thereby appropriately driving the needle 18 in the three-dimensional space (that is, without touching other members or devices). be able to.
- the computer 21 can accurately grasp the position of the needle 18 in the three-dimensional space by using image data acquired from at least two different directions. Thereby, the computer 21 can appropriately drive the needle 18 three-dimensionally.
- the computer 21 uses the image data actually generated immediately before moving the needle 18 in advance as a template (reference image data), template matching with high matching accuracy can be performed regardless of the shape of the needle 18. it can. Accordingly, the computer 21 can accurately grasp the position of the needle 18 in the three-dimensional space, and can appropriately drive the needle 18 in the three-dimensional space. Furthermore, since the computer 21 retracts the stage 12 and acquires each image data in a state where there is no complicated structure in the background of the needle 18, it is possible to clearly grasp the shape of the needle 18 by eliminating the influence of the background. A template (reference image data) can be acquired.
- the computer 21 connects the needle 18 and the sample piece Q by the deposition film without bringing them into contact, the needle 18 is cut when the needle 18 and the sample piece Q are separated in a later step. This can be prevented. Further, even when the needle 18 vibrates, it is possible to suppress the vibration from being transmitted to the sample piece Q. Furthermore, even when the movement of the sample piece Q due to the creep phenomenon of the sample S occurs, it is possible to suppress the occurrence of excessive strain between the needle 18 and the sample piece Q.
- the gas supply unit 17 supplies a deposition gas containing platinum or tungsten, a dense deposition film with a thin film thickness can be formed. Thereby, even if the gas supply unit 17 is a case where the needle 18 and the sample piece Q are cut by an etching process in a later step, the process efficiency can be improved by the thin deposition film.
- the computer 21 determines whether or not the cutting is actually completed between the sample S and the needle 18 when the connection between the sample S and the sample piece Q is cut by etching processing by irradiation of the focused ion beam. This can be confirmed by detecting the presence or absence of conduction. Furthermore, since the computer 21 notifies that the actual separation between the sample S and the sample piece Q is not completed, the execution of a series of steps automatically executed following this step is interrupted. Even in such a case, the cause of the interruption can be easily recognized by the operator. Further, when the continuity between the sample S and the needle 18 is detected, the computer 21 determines that the disconnection between the sample S and the sample piece Q has not actually been completed, and performs this process.
- the connection between the sample piece Q and the needle 18 is cut off in preparation for the subsequent drive of the needle 18 such as retraction.
- the computer 21 can prevent the occurrence of problems such as the displacement of the sample S accompanying the driving of the needle 18 or the breakage of the needle 18.
- the computer 21 detects the continuity between the sample S and the needle 18 and drives the needle 18 after confirming that the disconnection between the sample S and the sample piece Q is actually completed. be able to. Thereby, the computer 21 can prevent the occurrence of problems such as the displacement of the sample S accompanying the driving of the needle 18 or the breakage of the needle 18.
- the computer 21 uses the actual image data as a template (reference image data) for the needle 18 to which the sample piece Q is connected, matching is performed regardless of the shape of the needle 18 connected to the sample piece Q. Highly accurate template matching can be performed. Accordingly, the computer 21 can accurately grasp the position of the needle 18 connected to the sample piece Q in the three-dimensional space, and can appropriately drive the needle 18 and the sample piece Q in the three-dimensional space. .
- the computer 21 extracts the positions of the plurality of columnar portions 34 constituting the sample table 33 using a known template of the sample table 33, it is determined whether or not the sample table 33 in an appropriate state exists. This can be confirmed prior to driving of the needle 18. Further, the computer 21 indirectly indicates that the needle 18 and the sample piece Q have reached the vicinity of the movement target position in accordance with the change in the absorption current before and after the needle 18 connected to the sample piece Q reaches the irradiation region. Can be accurately grasped. As a result, the computer 21 can stop the needle 18 and the sample piece Q without bringing them into contact with other members such as the sample stage 33 existing at the movement target position, and problems such as damage caused by the contact occur. This can be prevented.
- the computer 21 detects the presence or absence of conduction between the sample stage 33 and the needle 18 when the sample piece Q and the sample stage 33 are connected by the deposition film, the connection between the sample piece Q and the sample stage 33 is actually performed. It is possible to accurately check whether or not the process is completed. Further, the computer 21 detects the presence / absence of conduction between the sample stage 33 and the needle 18 and confirms that the connection between the sample stage 33 and the sample piece Q is actually completed before the sample piece Q and The connection with the needle 18 can be disconnected.
- the computer 21 can easily recognize the needle 18 by pattern matching when the needle 18 is driven in a three-dimensional space by matching the actual shape of the needle 18 with the ideal reference shape.
- the position of the needle 18 in the three-dimensional space can be detected with high accuracy.
- the needle drive mechanism 19 is provided integrally with the stage 12, but is not limited thereto.
- the needle drive mechanism 19 may be provided independently of the stage 12.
- the needle drive mechanism 19 may be provided independently from the tilt drive of the stage 12 by being fixed to the sample chamber 11 or the like, for example.
- the focused ion beam irradiation optical system 14 has the optical axis in the vertical direction
- the electron beam irradiation optical system 15 has the optical axis inclined with respect to the vertical direction.
- the present invention is not limited to this.
- the focused ion beam irradiation optical system 14 may have a direction in which the optical axis is inclined with respect to the vertical
- the electron beam irradiation optical system 15 may have the optical axis in the vertical direction.
- the charged particle beam irradiation optical system is configured to be able to irradiate the two types of beams of the focused ion beam irradiation optical system 14 and the electron beam irradiation optical system 15, but is not limited thereto.
- the configuration may be such that there is no electron beam irradiation optical system 15 and only the focused ion beam irradiation optical system 14 installed in the vertical direction.
- the electron beam and the focused ion beam are irradiated from different directions to the sample piece holder P, the needle 18, the sample piece Q, etc.
- the image by the electron beam and the focused ion beam are used.
- the image was acquired.
- the positions and positional relationships of the sample piece holder P, the needle 18, the sample piece Q, and the like are ascertained based on the images of the electron beam and the focused ion beam, but only the image of the focused ion beam is used.
- step S22 when the positional relationship between the sample piece holder P and the sample piece Q is grasped, in the case where the inclination of the stage 12 is horizontal and the case where the stage 12 is inclined from the horizontal at a specific inclination angle, An image by the focused ion beam is acquired so that both the sample piece holder P and the sample piece Q are in the same field of view.
- the three-dimensional positional relationship between the sample piece holder P and the sample piece Q can be grasped from both the images when the stage 12 is inclined horizontally and when it is inclined from the horizontal at a specific inclination angle.
- the needle drive mechanism 19 can be moved horizontally and vertically and tilted integrally with the stage 12, the relative positional relationship between the sample piece holder P and the sample piece Q is maintained regardless of whether the stage 12 is horizontal or inclined. . Therefore, even if there is only one charged ion beam irradiation optical system 14 of the focused ion beam irradiation optical system 14, the sample piece Q can be observed and processed from two different directions. Similarly, registration of image data of the sample piece holder P in step S02, recognition of the needle position in step S07, acquisition of a needle template (reference image) in step S08, reference of the needle 18 to which the sample piece Q is connected in step S17.
- the stage 12 is connected in a horizontal state by forming a deposition film from the upper end surface of the sample piece holder P and the sample piece Q.
- the deposition film can be formed from different directions by tilting the stage 12, and a reliable connection can be made.
- the computer 21 automatically executes the series of processing from step S01 to step S30 as the automatic sample sampling operation.
- the computer 21 may switch so that at least one of steps S01 to S30 is executed manually by the operator.
- the computer 21 performs the automatic sample sampling operation on the plurality of sample pieces Q, each time one of the plurality of sample pieces Q is formed on the sample S, the one sample piece Q An automatic sample sampling operation may be performed on the above.
- the computer 21 may execute an automatic sample sampling operation on each of the plurality of sample pieces Q after all the plurality of sample pieces Q are formed on the sample S.
- the computer 21 extracts the position of the columnar part (pillar) 34 using a known template of the columnar part (pillar) 34. However, as this template, the actual columnar part (pillar) is previously extracted. A reference pattern created from 34 image data may be used. Further, the computer 21 may use a pattern created during execution of automatic processing for forming the sample stage 33 as a template. In the above-described embodiment, the computer 21 uses the reference mark Ref formed by irradiation of the charged particle beam when the columnar part (pillar) 34 is created, and the relative relationship between the position of the needle 18 and the position of the sample stage 33. You may know. The computer 21 detects the relative position of the needle 18 with respect to the position of the sample stage 33, thereby appropriately driving the needle 18 in the three-dimensional space (that is, without touching other members or devices). be able to.
- the computer 21 supplies the gas to the surface of the sample piece Q and the sample stage 33 by the gas supply unit 17 after moving the sample piece Q connected to the needle 18 toward the attachment position.
- the computer 21 may supply the gas to the irradiation region by the gas supply unit 17 before the sample piece Q connected to the needle 18 reaches the target position around the attachment position.
- the computer 21 can form a deposition film on the sample piece Q in a state where the sample piece Q connected to the needle 18 moves toward the attachment position, and the sample piece Q is etched by the focused ion beam. Can be prevented. Further, the computer 21 can immediately connect the sample piece Q and the sample stage 33 with the deposition film when the sample piece Q reaches the target position around the attachment position.
- the computer 21 performs the etching process at a specific rotational position while rotating the needle 18 around the central axis, but is not limited thereto.
- the computer 21 may perform the etching process by irradiating the focused ion beam from a plurality of different directions in accordance with the tilt (rotation around the X axis or Y axis) of the stage 12 by the tilt mechanism 13b of the drive mechanism 13.
- the computer 21 sharpens the tip of the needle 18 every time in the automatic sample sampling operation.
- the computer 21 may perform sharpening of the needle 18 at an appropriate timing when the automatic sample sampling operation is repeatedly performed, for example, at a predetermined number of times of repeated execution.
- the computer 21 executes the needle trimming process after the stage evacuation process (step S28).
- the present invention is not limited to this.
- the computer 21 recognizes an image of the tip shape of the needle 18 at a timing before the sample piece Q is first moved by the needle 18, for example, before the template creation step (step S08) of the needle 18, and When the sharpening is necessary, the tip of the needle 18 may be sharpened.
- step S22 to step S25 for connecting the sample piece Q to the sample piece holder P may be performed as follows. That is, in the process of obtaining the positional relationship (distance between each other) from the columnar portion 34 of the sample piece holder P, the sample piece Q, and the image, and operating the needle drive mechanism 19 so that these distances have a target value. is there.
- the computer 21 recognizes the positional relationship between the secondary particle image data or the absorption current image data of the needle 18, the sample piece Q, and the columnar portion 34 by the electron beam and the focused ion beam.
- FIG. 32 and 33 are diagrams schematically showing the positional relationship between the columnar portion 34 and the sample piece Q.
- FIG. 32 is based on an image obtained by focused ion beam irradiation
- FIG. 33 is based on an image obtained by electron beam irradiation. Yes. From these figures, the relative positional relationship between the columnar portion 34 and the sample piece Q is measured. As shown in FIG. 32, an orthogonal three-axis coordinate (coordinate different from the three-axis coordinate of the stage 12) is determined with one corner of the columnar part 34 as the origin 34a, and the distance between the origin 34a of the columnar part 34 and the reference point Qc of the sample piece Q is determined. From FIG. 32, distances DX and DY are obtained.
- the distance DZ is obtained from FIG. However, since it is inclined by an angle ⁇ with respect to the electron beam optical axis and the focused ion beam axis (vertical), the actual distance between the columnar portion 34 and the sample piece Q in the Z-axis direction is DZ / sin ⁇ .
- step 23 in the above-described embodiment the needle driving mechanism 19 is operated so that the distance between the columnar part 34 measured from the image of the needle 18 and the sample piece Q becomes a target value.
- the processing from step S22 to step S25 for connecting the sample piece Q to the sample piece holder P may be performed as follows. That is, this is a process in which the attachment position of the sample piece Q to the columnar portion 34 of the sample piece holder P is determined in advance as a template, and the needle driving mechanism 19 is operated by pattern matching the image of the sample piece Q at that position. .
- a template showing the movement stop position relationship of the sample piece Q with respect to the columnar portion 34 will be described.
- the upper end surface 34b of the columnar portion 34 and the upper end surface Qb of the sample piece Q are flush with each other, the side surface of the columnar portion 34 and the cross section of the sample piece Q are the same plane, and between the columnar portion 34 and the sample piece Q. Is a positional relationship with a gap of about 0.5 ⁇ m.
- Such a template may create a line drawing by extracting a contour (edge) portion from the secondary particle image or absorption current image data of the needle 18 to which the actual sample piece holder P or sample piece Q is fixed, You may create as a line drawing from a design drawing.
- the columnar portion 34 is displayed superimposed on the image of the columnar portion 34 by the electron beam and the focused ion beam in real time, and an operation instruction is given to the needle driving mechanism 19 so that the sample piece Q is placed on the template. It moves toward the stop position of the sample piece Q (steps 23 and 24). After confirming that the image by the electron beam and the focused ion beam in real time overlaps with the stop position of the sample piece Q on the predetermined template, the needle drive mechanism 19 is stopped (step 25). In this way, the sample piece Q can be accurately moved to the predetermined stop position relative to the columnar portion 34.
- step 23 in the above-described embodiment, the needle 18 is moved. If the sample piece Q that has finished step 23 is in a positional relationship greatly deviated from the target position, the following operation may be performed.
- step 22 it is desirable that the position of the sample piece Q before the movement is in a region of Y> 0, Z> 0 in the orthogonal triaxial coordinate system with the origin of each columnar portion 34. This is because there is very little risk of the sample piece Q colliding with the columnar portion 34 during the movement of the needle 18, and the X, Y, and Z drive portions of the needle drive mechanism 19 are simultaneously operated to quickly and safely.
- the target position can be reached.
- the columnar portion 34 is obtained by simultaneously operating the X, Y, and Z drive portions of the needle drive mechanism 19 with the sample piece Q directed to the stop position.
- the needle 18 reaches the target position along a path avoiding the columnar part 34.
- the sample piece Q is driven only by the Y axis of the needle driving mechanism 19 and moved to a region where Y> 0 to reach a predetermined position, and then the X, Y, Z driving unit It moves toward the final stop position by simultaneous operation.
- the sample piece Q can be safely and quickly moved without colliding with the columnar portion 34.
- the computer 21 may be a software function unit or a hardware function unit such as an LSI.
- the computer 21 is based on at least the sample piece holder P, the needle 18, and the template obtained in advance of the sample piece Q, and each beam irradiation optical system 14, 15, each drive mechanism 13, 19, and Since the gas supply unit 17 is controlled, it is possible to provide the automatic sample preparation device 10 capable of appropriately automating the operation of transferring the sample piece Q to the sample piece holder P.
- SYMBOLS 10 Charged particle beam apparatus, 11 ... Sample chamber, 12 ... Stage (sample stage), 13 ... Drive mechanism, 14 ... Focused ion beam irradiation optical system (charged particle beam irradiation optical system), 15 ... Electron beam irradiation optical system ( (Charged particle beam irradiation optical system), 16 ... detector (secondary particle detector), 17 ... gas supply unit, 18 ... needle, 19 ... needle drive mechanism, 20 ... display device, 21 ... computer, 22 ... input device, 33 ... Sample stage, 34 ... Columnar part, P ... Sample piece holder, Q ... Sample piece, R ... Secondary charged particle, S ... Sample cage
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Abstract
Description
なお、本明細書で用いる「サンプリング」とは、試料に荷電粒子ビームを照射することによって作製した試料片を摘出して、その試料片を観察、分析、および計測などの各種工程に適した形状に加工することを指す。さらに具体的には、「サンプリング」とは、試料に集束イオンビームを照射する加工によって形成された試料片を試料片ホルダに移設することを言う。
(1)本発明の一態様に係る自動試料作製装置は、試料から試料片を自動的に作製する自動試料作製装置であって、荷電粒子ビームを照射する荷電粒子ビーム照射光学系と、前記試料を載置して移動する試料ステージと、前記試料から分離および摘出した前記試料片を保持して搬送する試料片移設手段と、前記試料片が移設された試料片ホルダを保持する試料片ホルダ固定台と、前記荷電粒子ビームによってデポジション膜を形成するガスを照射するガス供給部と、少なくとも前記試料片移設手段に保持された前記試料片の予め取得した前記荷電粒子ビームによる画像を基にして、前記試料片を前記試料片ホルダに移設するよう前記荷電粒子ビーム照射光学系と前記試料片移設手段と前記ガス供給部を制御するコンピュータと、を備える。
なお、集束イオンビーム照射光学系14および電子ビーム照射光学系15の照射対象は、ステージ12に固定された試料S、試料片Q、および照射領域内に存在するニードル18などである。
ステージ12は、試料Sを保持する。ステージ12は、試料片ホルダPを保持するホルダ固定台12aを備えている。図3は試料片ホルダPの平面図であり、図4は側面図である。試料片ホルダPは、切欠き部31を有する半円形板状の基部32と、切欠き部31に固定される試料台33とを備えている。基部32は、例えば金属によって直径3mmおよび厚さ50μmなどの円形板状に形成されている。試料台33は、例えばシリコンウェハからMEMSプロセスによって形成され、導電性の接着剤によって切欠き部31に貼着されている。試料台33は櫛歯形状であり、離間配置されて突出する複数(例えば、5本など)で、幅が異なる柱状部(ピラー)34を備えている。各柱状部34の幅を違えておくことに加え、各柱状部34に移設した試料片Qと対応付けてコンピュータ21に記憶させておくことにより、複数の柱状部34に保持された試料片Qを間違わずに認識することができる。各柱状部34は、例えば先端部の厚さが10μm以下などに形成され、先端面に取り付けられる試料片Qを保持する。
集束イオンビーム照射光学系14は、イオンを発生させるイオン源14aと、イオン源14aから引き出されたイオンを集束および偏向させるイオン光学系14bと、を備えている。イオン源14aおよびイオン光学系14bは、コンピュータ21から出力される制御信号に応じて制御され、集束イオンビームの照射位置および照射条件などがコンピュータ21によって制御される。イオン源14aは、例えば、液体ガリウムなどを用いた液体金属イオン源、プラズマ型イオン源、ガス電界電離型イオン源などである。イオン光学系14bは、例えば、コンデンサレンズなどの第1静電レンズと、静電偏向器と、対物レンズなどの第2静電レンズと、などを備えている。
電子ビーム照射光学系15は、電子を発生させる電子源15aと、電子源15aから射出された電子を集束および偏向させる電子光学系15bと、を備えている。電子源15aおよび電子光学系15bは、コンピュータ21から出力される制御信号に応じて制御され、電子ビームの照射位置および照射条件などがコンピュータ21によって制御される。電子光学系15bは、例えば、電磁レンズと偏向器となどを備えている。
コンピュータ21は、入力デバイス22から出力される信号または予め設定された自動運転制御処理によって生成される信号などによって、荷電粒子ビーム装置10aの動作を統合的に制御する。
次に、コンピュータ21は、柱状部(ピラー)34のテンプレート作成工程を実行する。コンピュータ21は、サンプリングプロセスの最初に柱状部(ピラー)34のテンプレートを作成する。コンピュータ21は、柱状部(ピラー)34毎にテンプレートを作成する。コンピュータ21は、柱状部(ピラー)34の座標取得とテンプレート作成をセットで行うとともに、テンプレートマッチングで柱状部(ピラー)34の形状を判定することによって検査を行なう。コンピュータ21は、テンプレートマッチングに用いる柱状部(ピラー)34のテンプレートとして、例えばエッジ情報またはCAD情報などを予め記憶している。コンピュータ21は、テンプレートマッチングのスコアによって柱状部(ピラー)34の形状を判定し、例えば柱状部(ピラー)34が所定の形状でない場合には、次の柱状部(ピラー)34を用いるように設定する。
この位置登録処理において、先ず、コンピュータ21は、粗調整の動作として、駆動機構13によってステージ12を駆動し、試料片ホルダPにおいて試料台33が取り付けられた位置に照射領域を位置合わせする。次に、コンピュータ21は、微調整の動作として、荷電粒子ビーム(集束イオンビームおよび電子ビームの各々)の照射により生成する各画像データから、事前に試料台33の設計形状から作成したテンプレートを用いて試料台33を構成する複数の柱状部34の位置を抽出する。そして、コンピュータ21は、抽出した各柱状部34の位置座標を、試料片Qの取り付け位置として記憶(登録処理)する。
コンピュータ21は、この位置登録処理を、自動試料サンプリングを実施する試料片Qの数の分だけ、順次、実施する。コンピュータ21は、試料片ホルダPの位置登録処理を、後述する試料片Qの移動に先立って行なうことによって、実際に適正な試料台33が存在することを予め確認する。
なお、この位置登録処理において、万一、試料片ホルダP自体、もしくは、柱状部34が変形や破損していて、試料片Qが取り付けられる状態に無い場合には、コンピュータ21は、上記の位置座標、画像データ、およびコード番号と共に、対応させて「使用不可」(試料片Qが取り付けられない)とも登録しておく。これによって、コンピュータ21は、後述する試料片Qの移動の際に、「使用不可」の試料片ホルダP、もしくは柱状部34はスキップされ、正常な試料片ホルダP、もしくは柱状部34に取り付けることができる。
次に、コンピュータ21は、駆動機構13によってステージ12を駆動し、試料片Qの姿勢が所定姿勢(例えば、ニードル18による取出しに適した姿勢など)になるように、姿勢制御モードに対応した角度分だけステージ12をZ軸周りに回転させる(ステップS04)。
次に、コンピュータ21は、ニードル駆動機構19によってニードル18を初期設定位置に移動させる。初期設定位置は、例えば、予め設定されている視野領域内の所定位置などであって、視野領域内で位置合わせが完了した試料片Qの周辺の所定位置などである。コンピュータ21は、ニードル18を初期設定位置に移動させた後に、ガス供給部17先端のノズル17aをステージ12の鉛直方向上方の待機位置から試料片Qの周辺の所定位置に下降させる(ステップS06)。
コンピュータ21は、ニードル18を移動させる際に、試料片Qを形成する自動加工の実行時に試料Sに形成されたレファレンスマークRefを用いて、試料片Qの位置を精度良く把握することができ、3次元的な移動であっても適正に移動させることができる。レファレンスマークRefは、加工の位置基準を示すマーク(例えば、ドリフト補正マーク)なので、試料片Qの形状が加工によって変化する場合であっても、レファレンスマークRefの位置は不変である。コンピュータ21は、レファレンスマークRefを基準にして形成された試料片Qに対して、レファレンスマークRefを用いてニードル18を精度良く移動させることができる。
先ず、コンピュータ21は、吸収電流画像モードに切り替え、ニードル18の位置を認識する(ステップS07)。コンピュータ21は、照射位置を走査しながらニードル18に荷電粒子ビームを照射することによってニードル18に流れる吸収電流を検出し、複数の異なる平面に対する吸収電流の2次元位置分布を示す吸収電流画像データを生成する。コンピュータ21は、集束イオンビームの照射によってXY平面(集束イオンビームの光軸に垂直な平面)の吸収電流画像データを取得し、電子ビームの照射によってXYZ平面(電子ビームの光軸に垂直な平面)の画像データを取得する。コンピュータ21は、2つの異なる方向から取得した各吸収電流画像データを用いて3次元空間でのニードル18の先端位置を検出する。
なお、コンピュータ21は、検出したニードル18の先端位置を用いて、駆動機構13によってステージ12を駆動して、ニードル18の先端位置を予め設定されている視野領域の中心位置(視野中心)に設定してもよい。
次に、コンピュータ21は、検出したニードル18の先端位置を用いて、ニードル18の先端形状に対するテンプレートマッチング用のテンプレート(レファレンス画像データ)を取得する(ステップS08)。図6は集束イオンビームにより得られるニードル18の先端のテンプレートを示す図であり、図7は電子ビームにより得られるニードル18の先端のテンプレートを示す図である。コンピュータ21は、駆動機構13によってステージ12を駆動し、試料片Qを視野領域から退避させた状態で照射位置を走査しながらニードル18に荷電粒子ビーム(集束イオンビームおよび電子ビームの各々)を照射する。コンピュータ21は、荷電粒子ビームの照射によってニードル18から放出される二次荷電粒子Rの複数の異なる平面内での位置分布を示す各画像データを取得する。コンピュータ21は、集束イオンビームの照射によってXY平面の画像データを取得し、電子ビームの照射によってXYZ平面(電子ビームの光軸に垂直な平面)の画像データを取得する。コンピュータ21は、集束イオンビームおよび電子ビームによる画像データを取得し、テンプレート(レファレンス画像データ)として記憶する。
コンピュータ21は、粗調整および微調整によりニードル18を移動させる直前に実際に取得する画像データをレファレンス画像データとするので、ニードル18の形状によらずに、精度の高いパターンマッチングを行うことができる。さらに、コンピュータ21は、ステージ12を退避させ、背景に複雑な構造物が無い状態で各画像データを取得するので、バックグラウンドの影響を排除したニードル18の形状が明確に把握できるテンプレート(レファレンス画像データ)を取得することができる。
また、コンピュータ21は、二次荷電粒子Rの画像データをレファレンス画像とする代わりに、吸収電流画像データをレファレンス画像としてもよい。この場合、コンピュータ21は、ステージ12を駆動して試料片Qを視野領域から退避させることなしに、2つの異なる平面に対して各吸収電流画像データを取得してもよい。
次に、コンピュータ21は、ニードル駆動機構19によってニードル18を移動させるニードル移動(粗調整)を実行する(ステップS09)。コンピュータ21は、試料Sに対する集束イオンビームおよび電子ビームの各々の照射によって生成する各画像データを用いて、試料片Qの形成時に予め集束イオンビームの照射によって試料Sに形成したレファレンスマークRef(上述した図2参照)を認識する。コンピュータ21は、認識したレファレンスマークRefを用いてニードル18の移動目標位置APを設定する。コンピュータ21は、移動目標位置APを、ニードル18と試料片Qとをデポジション膜によって接続する加工を行なうために必要とされる位置とし、試料片Qの形成時の加工照射枠Fに対して所定の位置関係を対応付けている。コンピュータ21は、集束イオンビームの照射によって試料Sに試料片Qを形成する際の加工照射枠FとレファレンスマークRefとの相対的な位置関係の情報を記憶している。なお、コンピュータ21は、相互に相関するレファレンスマークRefと加工照射枠Fと移動目標位置APとを、予め試料片Qの形成時などに一括して設定してもよいし、適宜の組み合わせで異なるタイミングに設定してもよい。コンピュータ21は、レファレンスマークRefと加工照射枠Fと移動目標位置APとを設定して、相互に対応付けて記憶している。
コンピュータ21は、認識したレファレンスマークRefを用いて、レファレンスマークRefと加工照射枠Fと移動目標位置(試料片Q上の所定位置)APとの相対的な位置関係を用いて、ニードル18の先端位置を移動目標位置APに向かい3次元空間内で移動させる。コンピュータ21は、ニードル18を3次元的に移動させる際に、例えば、先ずX方向およびY方向で移動させ、次にZ方向に移動させる。
コンピュータ21は、ニードル18を移動させる際に、レファレンスマークRefを用いて試料片Qの位置を精度良く把握することができ、移動目標位置APに対する3次元的な移動であっても、ニードル18を適正に移動させることができる。レファレンスマークRefの位置は、試料片Qの形状が加工によって変化する場合であっても不変なので、コンピュータ21は、レファレンスマークRefに対応付けられた移動目標位置APを用いて、ニードル18を試料片Qに対して精度良く移動させることができる。
また、図9においては、2本のニードル18a、18bが表示されているが、ニードル移動の状況を示すために、同じ視野について移動前後のニードル先端位置の画像データを重ねて表示したもので、同一のニードル18である。
このステップS12では、コンピュータ21は、ニードル18を試料片Qに接触させずにデポジション膜により接続するので、接触に起因する損傷などの不具合が発生することを防止できる利点を有している。さらに、後の工程でニードル18と試料片Qとが切断により分離される際にニードル18が切断されてしまうことを防止することができる。さらに、ニードル18の振動が発生する場合であっても、この振動が試料片Qに伝達されることを抑制することができる。さらに、試料Sのクリープ現象による試料片Qの移動が発生する場合であっても、ニードル18と試料片Qとの間に過剰なひずみが生じることを抑制することができる。図12は、この様子を示しており、本発明の実施形態に係る自動試料作製装置10の集束イオンビームにより得られる画像データにおける、ニードル18および試料片Qの接続加工位置を含む加工照射枠R1を示す図である。
コンピュータ21は、試料Sとニードル18との導通を検出することによって、試料片Qが試料Sから切り離されたか否かを判定する。コンピュータ21は、切断加工の終了後、つまり切断加工位置T1での試料片Qと試料Sとの間の支持部Qaの切断が完了した後に、試料Sとニードル18との導通を検出した場合には、試料片Qが試料Sから切り離されていないと判定する。コンピュータ21は、試料片Qが試料Sから切り離されていないと判定した場合には、この試料片Qと試料Sとの分離が完了していないことを表示または音により報知して、これ以降の処理の実行を停止する。一方、コンピュータ21は、試料Sとニードル18との導通を検出しない場合には、試料片Qが試料Sから切り離されたと判定し、これ以降の処理の実行を継続する。
次に、コンピュータ21は、ステージ退避の処理を行なう(ステップS15)。コンピュータ21は、図15に示すように、駆動機構13によってステージ12を所定距離(例えば、5mmなど)だけ鉛直方向下方(つまりZ方向の負方向)に下降させる。コンピュータ21は、ステージ12を所定距離だけ下降させた後に、ガス供給部17のノズルをステージ12の鉛直方向上方の待機位置に上昇させる。図15は、この様子を示しており、本発明の実施形態に係る自動試料作製装置10の電子ビームにより得られる画像データにおける試料片Qが接続されたニードル18に対してステージ12を退避させた状態を示す図である。
次に、コンピュータ21は、必要に応じて姿勢制御工程を実行する。コンピュータ21は、試料Sから取り出した試料片Qを回転させ、試料片ホルダPに試料片Qの上下または左右を変更した状態の試料片Qを固定する。コンピュータ21は、試料片Qにおける元の試料Sの表面が柱状部34の端面に垂直関係にあるか平行関係になるよう試料片Qを固定する。これによりコンピュータ21は、例えば後に実行する仕上げ加工に適した試料片Qの姿勢を確保するとともに、仕上げ加工時に生じるカーテン効果の影響などを低減することができる。コンピュータ21は、ニードル18を回転させる際には偏心補正を行なうことによって、試料片Qが実視野から外れないように回転を補正する。
さらに、コンピュータ21は、必要に応じて集束イオンビームの照射によって試料片Qの整形加工を行なう。特に、整形後の試料片Qは、柱状部34に接する端面が、柱状部34の端面とほぼ平行になるように整形されることが望ましい。コンピュータ21は、後述するテンプレート作成前に試料片Qの一部を切断するなどの整形加工を行なう。コンピュータ21は、この整形加工の加工位置をニードル18からの距離を基準として設定する。これによりコンピュータ21は、後述するテンプレートからのエッジ抽出を容易にするとともに、後に実行する仕上げ加工に適した試料片Qの形状を確保する。
図16および図17は、ニードル18の回転角度0°でのアプローチモードにおいて、試料片Qが接続されたニードル18の状態を示す図である。図16は、本発明の実施形態に係る自動試料作製装置10の集束イオンビームにより得られる画像データにおける試料片Qが接続されたニードル18の状態を示す図である。図17は、自動試料作製装置10の電子ビームにより得られる画像データにおける試料片Qが接続されたニードル18の状態を示す図である。コンピュータ21は、ニードル18の回転角度0°でのアプローチモードにおいては、ニードル18を回転させずに試料片Qを試料片ホルダPに移設するために適した姿勢状態を設定している。
図18および図19は、ニードル18の回転角度90°でのアプローチモードにおいて、試料片Qが接続されたニードル18の状態を示す図である。図18は、本発明の実施形態に係る自動試料作製装置10の集束イオンビームにより得られる画像データにおける試料片Qが接続されたニードル18を90°回転させた状態を示す図である。図19は、自動試料作製装置10の電子ビームにより得られる画像データにおける試料片Qが接続されたニードル18を90°回転させた状態を示す図である。コンピュータ21は、ニードル18の回転角度90°でのアプローチモードにおいては、ニードル18を90°だけ回転させた状態で試料片Qを試料片ホルダPに移設するために適した姿勢状態を設定している。
図20および図21は、ニードル18の回転角度180°でのアプローチモードにおいて、試料片Qが接続されたニードル18の状態を示す図である。図20は、本発明の実施形態に係る自動試料作製装置10の集束イオンビームにより得られる画像データにおける試料片Qが接続されたニードル18を180°回転させた状態を示す図である。図21は、自動試料作製装置10の電子ビームにより得られる画像データにおける試料片Qが接続されたニードル18を90°回転させた状態を示す図である。コンピュータ21は、ニードル18の回転角度180°でのアプローチモードにおいては、ニードル18を180°だけ回転させた状態で試料片Qを試料片ホルダPに移設するために適した姿勢状態を設定している。
なお、ニードル18と試料片Qとの相対的な接続姿勢は、予め上述した試料片ピックアップ工程においてニードル18を試料片Qに接続する際に、各アプローチモードに適した接続姿勢に設定されている。
次に、コンピュータ21は、ニードルおよび試料片のテンプレート作成工程を実行する。コンピュータ21は、相互に接続されたニードル18および試料片Qの背景に構造物がない場所にニードル18を移動させてからテンプレートを取得する。これによりコンピュータ21は、集束イオンビームおよび電子ビームの各々により得られる画像データからニードル18および試料片Qのエッジ(輪郭)を自動認識する際に、ニードル18および試料片Qの背景の構造物によってエッジを誤認することを防止する。コンピュータ21は、試料片Qが固定されたニードル18を必要に応じて回転させた姿勢状態(つまり、試料台33の柱状部(ピラー)34に試料片Qを接続する姿勢)のニードル18および試料片Qのテンプレートを作成する。これによりコンピュータ21は、ニードル18の回転に応じて、集束イオンビームおよび電子ビームの各々により得られる画像データから3次元的にニードル18および試料片Qのエッジ(輪郭)を認識する。なお、コンピュータ21は、ニードル18の回転角度0°でのアプローチモードにおいては、電子ビームを必要とせずに、集束イオンビームにより得られる画像データからニードル18および試料片Qのエッジ(輪郭)を認識してもよい。
コンピュータ21は、ニードル18および試料片Qの背景に構造物がない場所にニードル18を移動させることを駆動機構13またはニードル駆動機構19に指示した際に、実際に指示した場所にニードル18が来ていない場合には、観察倍率を低倍率にしてニードル18を探す。コンピュータ21は、見つからない場合にはニードル18の位置座標を初期化して、ニードル18を初期位置に移動させる。
コンピュータ21は、集束イオンビーム加工により実際に形成された形状の試料片Qおよび試料片Qが接続されたニードル18に対して実際に取得する画像データをレファレンス画像データとするので、試料片Qおよびニードル18の形状によらずに、精度の高いパターンマッチングを行うことができる。
なお、コンピュータ21は、各画像データを取得する際に、試料片Qおよび試料片Qが接続されたニードル18の形状の認識精度を増大させるために予め記憶した好適な倍率、輝度、コントラスト等の画像取得条件を用いる。
次に、コンピュータ21は、駆動機構13によってステージ12を移動させて試料片ホルダPの水平位置を調整するとともに、試料片ホルダPの姿勢が所定姿勢になるように、姿勢制御モードに対応した角度分だけステージ12を回転させる(ステップS20)。そしてコンピュータ21は、ガス供給部17のノズル17aをステージ12の鉛直方向上方の待機位置から加工位置に向かい下降させる。
次に、コンピュータ21は、ピラーのテンプレートマッチング工程を実行する。コンピュータ21は、櫛歯形状の試料台33の複数の柱状部(ピラー)34の位置を正確に認識するために、テンプレートマッチングを実施する。コンピュータ21は、予めピラーのテンプレート作成工程において作成した柱状部(ピラー)34毎のテンプレートを用いて、集束イオンビームおよび電子ビームの各々の照射により得られる各画像データにおいてテンプレートマッチングを実施する。
なお、コンピュータ21は、ステージ12を移動させることを駆動機構13に指示した際に、実際にはステージ12が所定位置に移動しない場合には、ステージ12の位置座標を初期化して、ステージ12を初期位置に移動させる。
また、コンピュータ21は、ステージ12を移動した後に実施する柱状部(ピラー)34毎のテンプレートマッチングにおいて、問題が認められる柱状部(ピラー)34が存在する場合には、試料片Qの取付対象を、問題が認められる柱状部(ピラー)34から隣の柱状部(ピラー)34に変更する。
また、コンピュータ21は、テンプレートマッチングにおいて画像データの所定領域(少なくとも柱状部(ピラー)34を含む領域)からエッジ(輪郭)を抽出する際には、抽出したエッジを表示装置20に表示する。柱状部(ピラー)34は、図22および図23に示すようにシャープなエッジ(輪郭)を有するので、マッチング精度の高いテンプレートマッチングを行なうことができる。また、コンピュータ21は、テンプレートマッチングにおいて画像データの所定領域(少なくとも柱状部(ピラー)34を含む領域)からエッジ(輪郭)を抽出することができない場合には、画像データを再度取得する。
先ず、コンピュータ21は、ニードル18の位置を認識する(ステップS22)。コンピュータ21は、照射位置を走査しながらニードル18に荷電粒子ビームを照射することによってニードル18に流れる吸収電流を検出し、複数の異なる平面に対する吸収電流の2次元位置分布を示す吸収電流画像データを生成する。コンピュータ21は、集束イオンビームの照射によってXY平面の吸収電流画像データを取得し、電子ビームの照射によってXYZ平面(電子ビームの光軸に垂直な平面)の画像データを取得する。コンピュータ21は、2つの異なる平面に対して取得した各吸収電流画像データを用いて3次元空間でのニードル18の先端位置を検出する。
なお、コンピュータ21は、検出したニードル18の先端位置を用いて、駆動機構13によってステージ12を駆動して、ニードル18の先端位置を予め設定されている視野領域の中心位置(視野中心)に設定してもよい。
次に、コンピュータ21は、試料片マウント工程を実行する。先ず、コンピュータ21は、ニードル18に接続された試料片Qの位置を正確に認識するために、テンプレートマッチングを実施する。コンピュータ21は、予めニードルおよび試料片のテンプレート作成工程において作成した相互に接続されたニードル18および試料片Qのテンプレートを用いて、集束イオンビームおよび電子ビームの各々の照射により得られる各画像データにおいてテンプレートマッチングを実施する。
なお、コンピュータ21は、このテンプレートマッチングにおいて画像データの所定の領域(少なくともニードル18および試料片Qを含む領域)からエッジ(輪郭)を抽出する際には、抽出したエッジを表示装置20に表示する。また、コンピュータ21は、テンプレートマッチングにおいて画像データの所定の領域(少なくともニードル18および試料片Qを含む領域)からエッジ(輪郭)を抽出することができない場合には、画像データを再度取得する。
そして、コンピュータ21は、集束イオンビームおよび電子ビームの各々の照射により得られる各画像データにおいて、相互に接続されたニードル18および試料片Qのテンプレートと、試料片Qの取付対象である柱状部(ピラー)34のテンプレートとを用いたテンプレートマッチングに基づき、試料片Qと柱状部(ピラー)34との距離を計測する。
そして、コンピュータ21は、最終的にステージ12に平行な平面内での移動のみによって試料片Qを、試料片Qの取付対象である柱状部(ピラー)34に移設する。
次に、コンピュータ21は、試料片マウント工程を実行する。コンピュータ21は、柱状部(ピラー)34に試料片Qをデポジションにより固定する工程において、柱状部(ピラー)34とニードル18と間の導通を検知した場合にデポジションを終了する。コンピュータ21は、柱状部(ピラー)34と試料片Qとの間に隙間を空けてニードル18を停止する。コンピュータ21は、この隙間を1μm以下とし、好ましくは、隙間を100nm以上かつ200nm以下とする。この隙間が500nm以上の場合には、デポジション膜による柱状部(ピラー)34と試料片Qとの接続に要する時間が所定値以上に長くなる。この隙間が小さくなるほど、デポジション膜による柱状部(ピラー)34と試料片Qとの接続に要する時間が短くなる。
なお、コンピュータ21は、この隙間を設ける際に、一度、柱状部(ピラー)34に試料片Qを接触させてから、隙間を空けてもよい。また、コンピュータ21は、柱状部(ピラー)34とニードル18と間の導通を検知する代わりに、柱状部(ピラー)34およびニードル18の吸収電流像を検知することによって隙間を設けてもよい。
コンピュータ21は、柱状部(ピラー)34とニードル18との間の導通、または柱状部(ピラー)34およびニードル18の吸収電流像を検知することによって、柱状部(ピラー)34に試料片Qを移設した後において、試料片Qとニードル18との切り離しの有無を検知する。
なお、コンピュータ21は、柱状部(ピラー)34とニードル18との間の導通を検知することができない場合には、柱状部(ピラー)34およびニードル18の吸収電流像を検知するように処理を切り替える。
また、コンピュータ21は、柱状部(ピラー)34とニードル18との間の導通を検知することができない場合には、この試料片Qの移設を停止し、この試料片Qをニードル18から切り離し、後述するニードルトリミング工程を実行してもよい。
コンピュータ21は、所定時間に亘って、切断加工位置T2に集束イオンビームを照射することによって、ニードル18を試料片Qから分離する。図27は、この様子を示しており、本発明の実施形態に係る自動試料作製装置10の集束イオンビームにより得られる画像データにおけるニードル18が試料片Qから切り離された状態を示す図である。
なお、コンピュータ21は、ニードル18を試料片Qから分離する際に、ニードル18と試料片Qとを接続するデポジション膜DM2を切断する代わりに、試料片Qの一部を切断してもよい。コンピュータ21は、試料片Qの一部とともにデポジション膜DM2およびニードル18を試料片Q(つまり切断した一部以外の部位)から分離してもよい。
次に、コンピュータ21は、ステージ退避の処理を行なう(ステップS28)。コンピュータ21は、駆動機構13によってステージ12を所定距離(例えば、5mmなど)だけ鉛直方向下方(つまりZ方向の負方向)に下降させる。コンピュータ21は、ステージ12を所定距離だけ下降させた後に、ガス供給部17の先端のノズル17aを現状の位置から遠ざける。
次に、コンピュータ21は、ニードルトリミング工程を実行する。コンピュータ21は、自動試料サンプリングにおいてサンプリング後、つまりニードル18によって試料Sから分離および摘出した試料片Qをニードル18から切り離した後に、ニードル18のトリミングを実施する。これによりコンピュータ21は、試料Sから試料片Qを分離および摘出する際にニードル18を繰り返し使用する。コンピュータ21は、ニードル18に付着しているデポジション膜DM2を、集束イオンビームを用いたエッチング加工により除去する。コンピュータ21は、予めニードルのテンプレート作成工程において作成したニードル18のテンプレートを用いて、集束イオンビームおよび電子ビームの各々の照射により得られる各画像データにおいてテンプレートマッチングを実施する。コンピュータ21は、ニードル18の背景に構造物がない場所にニードル18を移動させてから、集束イオンビームおよび電子ビームの各々の照射によって各画像データを取得する。
なお、コンピュータ21は、このテンプレートマッチングにおいて画像データの所定の領域(少なくともニードル18の先端を含む領域)からエッジ(輪郭)を抽出する際には、抽出したエッジを表示装置20に表示する。
また、コンピュータ21は、テンプレートマッチングの処理に異常が生じる場合には、ニードル18の位置座標を初期化して、ニードル18を初期位置に移動させた後に、ニードル18の背景に構造物がない場所にニードル18を移動させる。さらに、コンピュータ21は、ニードル18の位置座標を初期化した後であっても、テンプレートマッチングの処理に異常が生じる場合には、ニードル18の形状に変形などの異常が生じていると判断して、自動試料サンプリングを終了する。
コンピュータ21は、ニードルトリミング工程を自動試料サンプリングの毎回の実行毎に実施してもよく、ニードルトリミング工程を定期的に実施することによって、自動試料サンプリングの処理を安定化させることができる。ニードルトリミング工程を備えることにより、ニードル18を交換することなく繰り返し試料サンプリングすることができるため、同一のニードル18を用いて複数の試料片Qを連続してサンプリングすることができる。
コンピュータ21は、ニードル18の先端形状を予め設定された理想的な所定形状に一致させることにより、ニードル18を3次元空間内で駆動する際などにおいて、パターンマッチングによってニードル18を容易に認識することができ、ニードル18の3次元空間内の位置を精度良く検出することができる。
以上により、自動試料サンプリングの動作が終了する。
コンピュータ21は、上述したステップ01からステップ30までを連続動作させることで、無人でサンプリング動作させることができる。従来のように、操作者の手動操作を施すことなく試料片Qを作製できる。
さらに、少なくとも試料片ホルダP、ニードル18、および試料片Qの背景に構造物が無い状態で荷電粒子ビームの照射によって取得した画像からテンプレートを作成するので、テンプレートの信頼性を向上させることができる。これにより、テンプレートを用いたテンプレートマッチングの精度を向上させることができ、テンプレートマッチングによって得られる位置情報を基にして試料片Qを精度良く試料片ホルダPに移設することができる。
さらに、MEMSプロセスにより形成される試料台33の柱状部(ピラー)34はシャープなエッジ(輪郭)を有するので、マッチング精度の高いテンプレートマッチングを行なうことができる。
さらに、試料片Qを試料片ホルダPに移設する際の姿勢に応じたテンプレートを作成するので、移設時の位置精度を向上させることができる。
さらに、少なくとも試料片ホルダP、ニードル18、および試料片Qのテンプレートを用いたテンプレートマッチングに基づき相互間の距離を計測するので、移設時の位置精度を、より一層、向上させることができる。
さらに、少なくとも試料片ホルダP、ニードル18、および試料片Qの各々の画像データにおける所定領域に対してエッジを抽出することができない場合に、画像データを再度取得するので、テンプレートを的確に作成することができる。
さらに、最終的にステージ12に平行な平面内での移動のみによって試料片Qを予め定めた試料片ホルダPの位置に移設するので、試料片Qの移設を適正に実施することができる。
さらに、テンプレートの作成前にニードル18に保持される試料片Qを整形加工するので、テンプレート作成時のエッジ抽出の精度を向上させることができるとともに、後に実行する仕上げ加工に適した試料片Qの形状を確保することができる。さらに、整形加工の位置をニードル18からの距離に応じて設定するので、精度良く整形加工を実施することができる。
さらに、試料片Qを保持するニードル18が所定姿勢になるように回転させる際に、偏芯補正によってニードル18の位置ずれを補正することができる。
さらに、コンピュータ21は、少なくとも2つの異なる方向から取得した画像データを用いることによって、ニードル18の3次元空間内の位置を精度良く把握することができる。これによりコンピュータ21は、ニードル18を3次元的に適切に駆動することができる。
さらに、コンピュータ21は、試料Sと試料片Qとの実際の分離が完了していないことを報知するので、この工程に続いて自動的に実行される一連の工程の実行が中断される場合であっても、この中断の原因を操作者に容易に認識させることができる。
さらに、コンピュータ21は、試料Sとニードル18との間の導通が検出された場合には、試料Sと試料片Qとの接続切断が実際には完了していないと判断して、この工程に続くニードル18の退避などの駆動に備えて、試料片Qとニードル18との接続を切断する。これによりコンピュータ21は、ニードル18の駆動に伴う試料Sの位置ずれまたはニードル18の破損などの不具合の発生を防止することができる。
さらに、コンピュータ21は、試料Sとニードル18との間の導通有無を検出して、試料Sと試料片Qとの接続切断が実際に完了していることを確認してからニードル18を駆動することができる。これによりコンピュータ21は、ニードル18の駆動に伴う試料Sの位置ずれまたはニードル18の破損などの不具合の発生を防止することができる。
さらに、コンピュータ21は、試料片Qが接続されたニードル18が照射領域内に到達する前後における吸収電流の変化に応じて、ニードル18および試料片Qが移動目標位置の近傍に到達したことを間接的に精度良く把握することができる。これによりコンピュータ21は、ニードル18および試料片Qを移動目標位置に存在する試料台33などの他の部材に接触させること無しに停止させることができ、接触に起因する損傷などの不具合が発生することを防止することができる。
さらに、コンピュータ21は、試料台33とニードル18との間の導通有無を検出して、試料台33と試料片Qとの接続が実際に完了していることを確認してから試料片Qとニードル18との接続を切断することができる。
上述した実施形態において、ニードル駆動機構19はステージ12と一体に設けられるとしたが、これに限定されない。ニードル駆動機構19は、ステージ12と独立に設けられてもよい。ニードル駆動機構19は、例えば試料室11などに固定されることによって、ステージ12のチルト駆動などから独立して設けられてもよい。
上述した実施形態において、集束イオンビーム照射光学系14は光軸を鉛直方向とし、電子ビーム照射光学系15は光軸を鉛直に対して傾斜した方向としたが、これに限定されない。例えば、集束イオンビーム照射光学系14は光軸を鉛直に対して傾斜した方向とし、電子ビーム照射光学系15は光軸を鉛直方向としてもよい。
上述した実施形態において、荷電粒子ビーム照射光学系として集束イオンビーム照射光学系14と電子ビーム照射光学系15の2種のビームが照射できる構成としたが、これに限定されない。例えば、電子ビーム照射光学系15が無く、鉛直方向に設置した集束イオンビーム照射光学系14のみの構成としてもよい。
上述した実施形態では、上述のいくつかのステップにおいて、試料片ホルダP、ニードル18、試料片Q等に電子ビームと集束イオンビームを異なる方向から照射して、電子ビームによる画像と集束イオンビームによる画像を取得していた。上述した実施形態では、電子ビームおよび集束イオンビームの画像に基づき、試料片ホルダP、ニードル18、試料片Q等の位置および位置関係を把握していたが、集束イオンビームの画像のみで行なう。
例えば、ステップS22において、試料片ホルダPと試料片Qとの位置関係を把握する場合には、ステージ12の傾斜が水平の場合と、或る特定の傾斜角で水平から傾斜する場合とにおいて、試料片ホルダPと試料片Qの両者が同一視野に入るように集束イオンビームによる画像を取得する。ステージ12の傾斜が水平の場合と、或る特定の傾斜角で水平から傾斜する場合との両画像から、試料片ホルダPと試料片Qの三次元的な位置関係が把握できる。上述したように、ニードル駆動機構19はステージ12と一体で水平垂直移動、傾斜ができるため、ステージ12が水平、傾斜に関わらず、試料片ホルダPと試料片Qの相対位置関係は保持される。そのため、荷電粒子ビーム照射光学系が集束イオンビーム照射光学系14の1本だけであっても、試料片Qを異なる2方向から観察、加工することができる。
同様に、ステップS02における試料片ホルダPの画像データの登録、ステップS07におけるニードル位置の認識、ステップS08におけるニードルのテンプレート(レファレンス画像)の取得、ステップS17における試料片Qが接続したニードル18のレファレンス画像の取得、ステップS21における試料片Qの取り付け位置の認識、およびステップS25におけるニードル移動停止においても同様に行なえばよい。
また、ステップS25における試料片Qと試料片ホルダPとの接続おいても、ステージ12が水平状態において試料片ホルダPと試料片Qの上端面からデポジション膜を形成して接続し、さらに、ステージ12を傾斜させて異なる方向からデポジション膜が形成でき、確実な接続ができる。
上述した実施形態において、コンピュータ21は、自動試料サンプリングの動作として、ステップS01からステップS30の一連の処理を自動的に実行するとしたが、これに限定されない。コンピュータ21は、ステップS01からステップS30のうちの少なくとも何れか1つの処理を、操作者の手動操作によって実行するように切り替えてもよい。
また、コンピュータ21は、複数の試料片Qに対して自動試料サンプリングの動作を実行する場合に、試料Sに複数の試料片Qの何れか1つが形成される毎に、この1つの試料片Qに対して自動試料サンプリングの動作を実行してもよい。また、コンピュータ21は、試料Sに複数の試料片Qの全てが形成された後に、複数の試料片Qの各々に対して自動試料サンプリングの動作を実行してもよい。
1つの試料片Qが形成される毎に自動試料サンプリングを実行する場合には、レファレンスマークRefに基づいて、試料片Qの形成およびニードル18の移動を、ステージ12の移動(例えば、ステージ12の傾斜など)無しに行うことができる。ステージ12を移動させずに試料片Qの形成およびニードル18の移動を行うので、位置ずれ及びレファレンスマークRefの認識ミスの発生を防ぐことができる。さらに、自動試料サンプリングが異常などによって中断される場合であっても、サンプリングされない試料片Qが生じることを防止することができる。
上述した実施形態において、コンピュータ21は、既知である柱状部(ピラー)34のテンプレートを用いて柱状部(ピラー)34の位置を抽出するとしたが、このテンプレートとして、予め実際の柱状部(ピラー)34の画像データから作成するレファレンスパターンを用いてもよい。また、コンピュータ21は、試料台33を形成する自動加工の実行時に作成したパターンを、テンプレートとしてもよい。
また、上述した実施形態において、コンピュータ21は、柱状部(ピラー)34の作成時に荷電粒子ビームの照射によって形成されるレファレンスマークRefを用いて、試料台33の位置に対するニードル18の位置の相対関係を把握してもよい。コンピュータ21は、試料台33の位置に対するニードル18の相対位置を逐次検出することによって、ニードル18を3次元空間内で適切に(つまり、他の部材や機器などに接触することなしに)駆動することができる。
上述した実施形態において、コンピュータ21は、ニードル18に接続された試料片Qを取り付け位置に向かい移動させた後に、試料片Qおよび試料台33の表面にガス供給部17によってガスを供給するとしたが、これに限定されない。
コンピュータ21は、ニードル18に接続された試料片Qが取り付け位置周辺の目標位置に到達するのに先立って、照射領域にガス供給部17によってガスを供給してもよい。
コンピュータ21は、ニードル18に接続された試料片Qが取り付け位置に向かい移動している状態で試料片Qにデポジション膜を形成することができ、試料片Qが集束イオンビームによってエッチング加工されてしまうことを防止することができる。さらに、コンピュータ21は、試料片Qが取り付け位置周辺の目標位置に到達した時点で直ちに試料片Qおよび試料台33をデポジション膜により接続することができる。
上述した実施形態において、コンピュータ21は、ニードル18を中心軸周りに回転させつつ、特定の回転位置においてエッチング加工を行なうとしたが、これに限定されない。
コンピュータ21は、駆動機構13のチルト機構13bによるステージ12のチルト(X軸またはY軸周りの回転)に応じて、複数の異なる方向からの集束イオンビームの照射によってエッチング加工を行なってもよい。
上述した実施形態において、コンピュータ21は、自動試料サンプリングの動作において、毎回、ニードル18の先端を先鋭化加工するとしたが、これに限定されない。
コンピュータ21は、自動試料サンプリングの動作が繰り返し実行される場合の適宜のタイミング、例えば繰り返し実行の回数が所定回数毎などにおいて、ニードル18の先鋭化加工を実行してもよい。
また、上述した実施形態において、コンピュータ21は、ステージ退避の処理(ステップS28)の実行後にニードルトリミング工程を実行するとしたが、これに限定されない。
コンピュータ21は、ニードル18によって最初に試料片Qを移設するよりも前のタイミング、例えばニードル18のテンプレート作成工程(ステップS08)よりも前などにおいて、ニードル18の先端形状を画像認識して、先端の先鋭化が必要な場合にニードル18の先端を先鋭化加工してもよい。
上述した実施形態において、試料片Qを試料片ホルダPに接続させるステップS22からステップS25までの処理を次のように行なってもよい。つまり、試料片ホルダPの柱状部34と試料片Qと画像から、それらの位置関係(互いの距離)を求め、それらの距離が目的の値となるようにニードル駆動機構19を動作させる処理である。
ステップ22おいて、コンピュータ21は、電子ビーム及び集束イオンビームによるニードル18、試料片Q、柱状部34の二次粒子画像データまたは吸収電流画像データをからそれらの位置関係を認識する。図32および図33は、柱状部34と試料片Qの位置関係を模式的に示した図であり、図32は集束イオンビーム照射によって、図33は電子ビーム照射によって得た画像を基にしている。これらの図から柱状部34と試料片Qの相対位置関係を計測する。図32のように柱状部34の一角を原点34aとして直交3軸座標(ステージ12の3軸座標とは異なる座標)を定め、柱状部34の原点34aと試料片Qの基準点Qcの距離として、図32から距離DX、DYが求まる。
一方、図33からは距離DZが求まる。但し、電子ビーム光学軸と集束イオンビーム軸(鉛直)に対して角度θだけ傾斜しているので、柱状部34と試料片QのZ軸方向の実際の距離はDZ/sinθとなる。
次に、柱状部34に対する試料片Qの移動停止位置関係を図32,図33で説明する。
柱状部34の上端面34bと試料片Qの上端面Qbを同一面とし、かつ、柱状部34の側面と試料片Qの断面が同一面となり、しかも、柱状部34と試料片Qとの間には約0.5μmの空隙がある位置関係とする。つまり、DX=0、DY=0.5μm、DZ=0となるように、ニードル駆動機構19を動作させることで、目標とする停止位置に試料片Qを到達させることができる。
上述した実施形態におけるステップ23では、ニードル18を画像から計測した柱状部34と試料片Qの間隔が目標の値となるようにニードル駆動機構19を動作させた。
上述した実施形態において、試料片Qを試料片ホルダPに接続させるステップS22からステップS25までの処理を次のように行なってもよい。つまり、試料片ホルダPの柱状部34への試料片Qの取り付け位置をテンプレートとして予め定めておき、その位置に試料片Qの画像をパターンマッチングさせて、ニードル駆動機構19を動作させる処理である。
柱状部34に対する試料片Qの移動停止位置関係を示すテンプレートを説明する。柱状部34の上端面34bと試料片Qの上端面Qbを同一面とし、かつ、柱状部34の側面と試料片Qの断面が同一面となり、しかも、柱状部34と試料片Qとの間には約0.5μmの空隙がある位置関係である。このようなテンプレートは、実際の試料片ホルダPや試料片Qを固着したニードル18の二次粒子画像や吸収電流画像データから輪郭(エッジ)部を抽出して線画を作成してもよいし、設計図面から線画として作成してもよい。
作成したテンプレートのうち柱状部34をリアルタイムでの電子ビーム及び集束イオンビームによる柱状部34の画像に重ねて表示し、ニードル駆動機構19に動作の指示を出すことで、試料片Qはテンプレート上の試料片Qの停止位置に向かって移動する(ステップ23,24)。リアルタイムでの電子ビーム及び集束イオンビームによる画像が、予め定めたテンプレート上の試料片Qの停止位置に重なったことを確認して、ニードル駆動機構19の停止処理を行なう(ステップ25)。このようにして、試料片Qを予め定めた柱状部34に対する停止位置関係に正確に移動させることができる。
上述した実施形態におけるステップ23ではニードル18を移動させた。もし、ステップ23を終えた試料片Qが、目的位置から大きくずれた位置関係にある場合、次の動作を行なってもよい。
ステップ22において、移動前の試料片Qの位置は、各柱状部34の原点とした直交3軸座標系において、Y>0、Z>0の領域に在ることが望ましい。これは、ニードル18の移動中に試料片Qが柱状部34への衝突の危険性が極めて少ないためで、ニードル駆動機構19のX、Y、Z駆動部を同時に動作させて、安全に迅速に目的位置に到達できる。一方、移動前の試料片Qの位置がY<0の領域にある場合、試料片Qを停止位置に向けてニードル駆動機構19のX、Y、Z駆動部を同時に動作させると、柱状部34に衝突する危険性が大きい。このため、ステップ22で試料片QがY<0の領域にある場合、ニードル18は柱状部34を避けた経路で目標位置に到達させる。具体的には、まず、試料片Qをニードル駆動機構19のY軸のみを駆動させ、Y>0の領域まで移動させて所定の位置に到達させ、次に、X、Y、Z駆動部の同時動作によって最終的な停止位置に向けて移動する。このようなステップによって、試料片Qを柱状部34に衝突することなく、安全に迅速に移動させることができる。
Claims (14)
- 試料から試料片を自動的に作製する自動試料作製装置であって、
荷電粒子ビームを照射する荷電粒子ビーム照射光学系と、
前記試料を載置して移動する試料ステージと、
前記試料から分離および摘出した前記試料片を保持して搬送する試料片移設手段と、
前記試料片が移設された試料片ホルダを保持する試料片ホルダ固定台と、
前記荷電粒子ビームによってデポジション膜を形成するガスを照射するガス供給部と、
少なくとも前記試料片移設手段に保持された前記試料片の予め取得した前記荷電粒子ビームによる画像を基にして、前記試料片を前記試料片ホルダに移設するよう前記荷電粒子ビーム照射光学系と前記試料片移設手段と前記ガス供給部を制御するコンピュータと、
を備えること、
を特徴とする自動試料作製装置。 - 前記コンピュータは、
前記試料片ホルダの前記荷電粒子ビームによる画像からエッジを抽出し、前記試料片ホルダのテンプレートを用いたテンプレートマッチングによって得られる位置情報を基にして、前記試料片を前記試料片ホルダに移設するよう前記試料片移設手段または前記試料ステージの移動を制御すること、
を特徴とする請求項1に記載の自動試料作製装置。 - 試料から試料片を自動的に作製する自動試料作製装置であって、
少なくとも、
集束イオンビームを照射する集束イオンビーム照射光学系と、
前記試料を載置して移動する試料ステージと、
前記試料から分離および摘出した前記試料片を保持して搬送する試料片移設手段と、
前記試料片が移設された試料片ホルダを保持する試料片ホルダ固定台と、
前記集束イオンビームによってデポジション膜を形成するガスを照射するガス供給部と、
少なくとも前記試料片移設手段に保持された前記試料片の予め取得した前記集束イオンビームによる異なる方向からの画像を基にして、前記試料片を前記試料片ホルダに移設するよう前記集束イオンビーム照射光学系と前記試料片移設手段と前記ガス供給部を制御するコンピュータと、
を備えること、
を特徴とする自動試料作製装置。 - 前記コンピュータは、
前記試料片ホルダの前記集束イオンビームによる画像からエッジを抽出し、前記試料片ホルダのテンプレートを用いたテンプレートマッチングによって得られる位置情報を基にして、前記試料片を前記試料片ホルダに移設するよう前記試料片移設手段または前記試料ステージの移動を制御すること、
を特徴とする請求項3に記載の自動試料作製装置。 - 前記コンピュータは、
前記画像からエッジを抽出することによって、少なくとも前記試料片移設手段に保持された前記試料片のテンプレートを作成し、前記テンプレートを用いたテンプレートマッチングによって得られる位置情報を基にして、前記試料片を前記試料片ホルダに移設するよう前記試料片移設手段または前記試料ステージの移動を制御すること、
を特徴とする請求項1または請求項3に記載の自動試料作製装置。 - 前記コンピュータは、
少なくとも前記試料片移設手段に保持された前記試料片の背景に構造物が無い状態で前記画像を取得すること、
を特徴とする請求項1から請求項5の何れか1つに記載の自動試料作製装置。 - 前記コンピュータは、
少なくとも前記試料片移設手段に保持された前記試料片の背景に構造物が無い状態となるように前記試料片移設手段または前記試料ステージの移動を指示した際に、実際には背景に構造物が無い状態とならない場合には、少なくとも前記試料片移設手段に接続された前記試料片を初期位置に移動させること、
を特徴とする請求項6に記載の自動試料作製装置。 - 前記コンピュータは、
前記試料片が所定姿勢になるように前記試料片移設手段を回転した状態で前記画像を取得すること、
を特徴とする請求項1から請求項5の何れか1つに記載の自動試料作製装置。 - 前記コンピュータは、
少なくとも前記試料片移設手段に保持された前記試料片の所定領域に対して前記画像からエッジを抽出することができない場合に、前記画像を再度取得すること、
を特徴とする請求項5に記載の自動試料作製装置。 - 前記コンピュータは、
前記画像を基にして、前記試料片移設手段に保持される前記試料片と前記試料片ホルダとの間の距離を取得し、
前記距離を基にして、前記試料片を予め定めた前記試料片ホルダの位置に移設するよう前記試料片移設手段または前記試料ステージの移動を制御すること、
を特徴とする請求項1から請求項9の何れか1つに記載の自動試料作製装置。 - 前記コンピュータは、
最終的に前記試料ステージに平行な平面内での移動のみによって前記試料片を予め定めた前記試料片ホルダの位置に移設すること、
を特徴とする請求項1から請求項10の何れか1つに記載の自動試料作製装置。 - 前記コンピュータは、
前記テンプレートの作成前に前記試料片移設手段に保持される前記試料片を整形加工すること、
を特徴とする請求項5に記載の自動試料作製装置。 - 前記コンピュータは、
前記整形加工の位置を前記試料片移設手段からの距離に応じて設定すること、
を特徴とする請求項12に記載の自動試料作製装置。 - 前記コンピュータは、
前記試料片を保持する前記試料片移設手段が所定姿勢になるように回転させる際に、偏心補正を行なうこと、
を特徴とする請求項1から請求項5の何れか1つに記載の自動試料作製装置。
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EP3163283A4 (en) | 2018-02-21 |
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US20200355589A1 (en) | 2020-11-12 |
US11073453B2 (en) | 2021-07-27 |
TWI664658B (zh) | 2019-07-01 |
EP3163283B1 (en) | 2023-08-30 |
CN106461516A (zh) | 2017-02-22 |
JPWO2016002719A1 (ja) | 2017-04-27 |
US20190025167A1 (en) | 2019-01-24 |
KR102383571B1 (ko) | 2022-04-06 |
JP7008355B2 (ja) | 2022-01-25 |
US10677697B2 (en) | 2020-06-09 |
JP6708547B2 (ja) | 2020-06-10 |
JP2022033241A (ja) | 2022-02-28 |
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