Source: http://www.google.com/patents/US20010025925?dq=7,249,099
Timestamp: 2016-09-26 07:52:05
Document Index: 22564874

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Patent US20010025925 - Charged particle beam system and pattern slant observing method - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA charged particle beam system comprising a charged beam source, a condenser lens, a scanning deflecting device, an objective lens and a secondary electron detector further comprises a slant observing deflecting device arranged between the objective lens and a sample. The slant observing deflecting device...http://www.google.com/patents/US20010025925?utm_source=gb-gplus-sharePatent US20010025925 - Charged particle beam system and pattern slant observing methodAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS20010025925 A1Publication typeApplicationApplication numberUS 09/816,468Publication dateOct 4, 2001Filing dateMar 26, 2001Priority dateMar 28, 2000Also published asUS6534766Publication number09816468, 816468, US 2001/0025925 A1, US 2001/025925 A1, US 20010025925 A1, US 20010025925A1, US 2001025925 A1, US 2001025925A1, US-A1-20010025925, US-A1-2001025925, US2001/0025925A1, US2001/025925A1, US20010025925 A1, US20010025925A1, US2001025925 A1, US2001025925A1InventorsHideaki Abe, Yuichiro Yamazaki, Kazuyoshi Sugihara, Masahiro InoueOriginal AssigneeKabushiki Kaisha ToshibaExport CitationBiBTeX, EndNote, RefManReferenced by (48), Classifications (18), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetCharged particle beam system and pattern slant observing method
BRIEF DESCRIPTION OF THE DRAWINGS [0040] In the drawings: [0041] [0041]FIG. 1 is a schematic diagram showing the first preferred embodiment of a charged particle beam system according to the present invention; [0042] [0042]FIGS. 2A and 2B are bottom and sectional views schematically showing a slant observing deflecting device shown in FIG. 1; [0043] [0043]FIG. 3 is an illustration showing an example of equipotential lines for explaining the calculation of a slant observing electrostatic deflecting device shown in FIGS. 2A and 2B; [0044] [0044]FIG. 4 is a graph showing the relationship between a voltage applied to the slant observing electrostatic deflecting device shown in FIGS. 2A and 2B, and a deflection angle of electron beams; [0045] [0045]FIG. 5 is a flow chart for explaining the procedure for carrying out a pattern slant observing method according to the present invention; [0046] [0046]FIG. 6 is a schematic diagram showing the second preferred embodiment of a charged particle beam system according to the present invention; [0047] [0047]FIG. 7 is a schematic diagram showing the third preferred embodiment of a charged particle beam system according to the present invention; [0048] [0048]FIG. 8 is a schematic diagram showing the fourth preferred embodiment of a charged particle beam system according to the present invention; [0049] [0049]FIG. 9 is a schematic diagram showing the fifth preferred embodiment of a charged particle beam system according to the present invention; [0050] [0050]FIG. 10 is a schematic diagram showing the sixth preferred embodiment of a charged particle beam system according to the present invention; [0051] [0051]FIGS. 11A through 11C are illustrations for explaining a method for correcting the shift of the irradiation position electron beams with which a sample is irradiated; [0052] [0052]FIG. 12 is a schematic diagram showing the seventh preferred embodiment of a charged particle beam system according to the present invention; [0053] [0053]FIG. 13 is a schematic diagram showing the eighth preferred embodiment of a charged particle beam system according to the present invention; and [0054] [0054]FIG. 14 is a schematic diagram showing the ninth preferred embodiment of a charged particle beam system according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS [0055] Referring now to the accompanying drawings, some preferred embodiment of the present invention will be described below. Furthermore, the same reference numbers are given to the same portions in the respective figures, and the descriptions thereof are omitted. [0056] (1) First Preferred Embodiment [0057] [0057]FIG. 1 is a schematic diagram showing the first preferred embodiment of a charged particle beam system according to the present invention. In this figure, the feature of a charged particle beam system 10 in this preferred embodiment is that a slant observing deflecting device 32 is provided between an objective lens 28 and a sample S. [0058] First, the schematic construction of this preferred embodiment will be described. The charged particle beam system 10 shown in FIG. 10 comprises an electron gun part, an electron-optical system, a stage, a secondary electron image acquiring part, and a control part. [0059] The stage 42 has a mechanism capable of moving in optional directions on a horizontal plane. The sample S is supported on the top face of the stage 42. The stage 42 is connected to a power supply 43 to apply an optional voltage on the sample S. Thus, a retarding field is formed above the sample S. [0060] The electron gun part includes an electron gun 12, an extraction electrode 14, and an acceleration electrode 16. The electron gun 12 emits electrons when a voltage is applied thereto. The extraction electrode 14 extracts the emission electrodes when a voltage is applied thereto. The acceleration electrode 16 accelerates the extracted emission electrodes to cause the electrons to be incident on the electron-optical system as electron beams 6. [0061] The electron-optical system includes a condenser lens 22, a scanning deflecting device 26, the objective lens 28, and the slant observing deflecting device 32 which is one of the feature in this preferred embodiment. [0062] The condenser lens 22 condenses the electron beams 6, which have passed through the acceleration electrode 16, to cause the condensed electron beams 6 to pass through a diaphragm 24. The scanning deflecting device 26 receives a serrate signal ACa through ACd from a scanning deflection control part 56, which will be described later, to scan and deflect the electron beams 26 which have passed through the diaphragm 24. The objective lens 28 condenses the scanned primary electron beams 6 to form an image on the top of the sample S. Between the objective lens 28 and the sample S, the slant observing deflecting device 32 is provided. In this preferred embodiment, the slant observing deflecting device 32 is an electrostatic deflecting device 32. The detailed construction and calculation of the slant observing deflecting device 32 will be described later. [0063] The secondary electron image acquiring part has a secondary electron detector 82, an image processing part 84 and a monitor 86. [0064] When the sample S is irradiated with the electron beams 6, secondary electrons and reflected electrons (which will be hereinafter referred to as secondary electrons and so forth) are generated. After the generated secondary electrons and so forth pass through the objective lens 28 while being accelerated by the retarding field formed between the sample S and the objective lens, the secondary electrons are drawn into the secondary electron detector 82. The secondary electrons and so forth detected by the secondary electron detector 82 are converted into electric signals by the image processing part 84 to be amplified to be supplied to the monitor 86. The monitor 86 displays a secondary electron image indicative of the state of the surface of the sample S. [0065] The control part comprises a control computer 2, the scanning deflection control part 56, and a slant observing deflection control part 62. The control computer 2 controls the whole system. The scanning deflection control part 56 is connected to the scanning deflecting device 26, and sets the above described serrate signal ACa through ACd on the basis of command signals, which are supplied from the control computer 2, and supplies the set serrate signal ACa through ACd to the scanning deflecting device 26. The slant observing deflection control part 62 is connected to the slant observing deflecting device 32, and sets a slant observing DC voltage DC1 on the basis of control signals, which are supplied from the control computer 2 and applies the DC voltage to the slant observing deflecting device 32. [0066] [0066]FIG. 2A is a bottom view schematically showing the slant observing deflecting device 32, and FIG. 2B is a sectional view taken along line A-A of FIG. 2A. In the charged particle beam system 10, the distance between the objective lens 28 and the sample S is generally very short, about a few mm. In this preferred embodiment, this distance is 2.5 mm. Therefore, the slant observing deflecting device 32 must be compact and simple. [0067] As shown in FIGS. 2A and 2B, the slant observing deflecting device 32 comprises a body 112, a sleeve 116, and four electrodes 114. In this preferred embodiment, the slant observing deflecting device 32 is mounted so that the top faces of the body 112 and sleeve 116 contact the bottom face of the objective lens. [0068] The body 112 includes a ring-shaped body portion 112 a, and four protruding portions 112 b which are formed on the peripheral edge portion of the bottom face of the body portion 112. In this preferred embodiment, the body portion 112 a and the protruding portions 112 b are integrally formed of an insulator. The protruding portions 112 b are arranged along a concentric circle about the center of beam axes so as to protrude outwardly from the outer peripheral edge of the body portion 112 a. The peripheral and bottom surfaces of the protruding portions 112 b are plated with gold to construct the electrodes 114. Each of the electrodes 114 is connected to the slant observing deflection control part 62 by means of wires so that a voltage can be applied thereto. [0069] Since the voltage applied to the electrodes 114 has a value of a few kV, there is the possibility that discharge may occur between the electrodes 114 and the bottom face of the objective lens 28. In this preferred embodiment, a sufficient edge face distance (DEa+DEb in the figure) is ensured by adopting the above described structure using the insulator. [0070] The sleeve 116 is mounted on the inner peripheral surface of the body 112. The sleeve 116 has a cylindrical shape which has a central axis common to the central axis of the body portion 112 a. The bottom face of the sleeve 116 is formed so as to protrude from the bottom face of the body portion 112 a toward the sample S. With such shape and arrangement, an electric field shielding is formed in a region extending from the bottom face of the objective lens 28 immediately before the electron beams 6 are incident on the surface of the sample. Thus, it is possible to prevent a deterioration of an electron-optics property such as lens aberration of the electron beams 6. [0071] The deflection angle and deflected direction of the electron beams 6 are controlled by set values of the respective slant observing deflection control parts 62. That is, since the slant observing deflecting device 32 in this preferred embodiment is an electrostatic deflecting device, the deflection angle and deflected direction can be controlled by DC voltage components applied to the electrodes 114. If different DC voltages are applied to the two facing electrodes 114, respectively, an ununiform electric field is formed between the electrodes 114 and below the electrodes 114. This ununiform electric field changes the deflected direction of the electron beams 6 to only one direction. Thus, the electron beams 6 can be slanted. [0072] [0072]FIG. 3 shows an example of equipotential lines which are numerically calculated when 0 V and +3.0 kV are applied to the two facing electrodes 114 a and 114 b, respectively. The distance between the objective lens 28 and the sample S is 2.5 mm, the incident voltage on the sample S is 0.4 kV, and the sample voltage is 0 V. As can be seen from this figure, an electric field is formed about the electrode 114 a to which the voltage of 3.0 kV is applied. Below the sleeve 116, the electric field projects toward the trajectories of the electron beams 6. By such an ununiform electric field, the trajectories of the electron beams 6 extending vertically downwards are bent to be attracted toward the electrode 114 a to which the voltage has been applied. As a result, the electron beams 6 are incident on the sample S at a deflection angle of about 20� while focusing by the force applied by the objective lens 28. By the irradiation with such slanted electron beams 6, the secondary electron image displayed on the monitor 86 is an image wherein the sample S is slanted by 20�. [0073] [0073]FIG. 4 shows the deflection angle of the electron beams 6 when the electrode voltage is changed from 0 V to 4 kV. In this figure, a line 1 a drawn between marks ∘ shows the deflection angle when the sample voltage=0 V, and a line 1 b drawn between marks Δ shows the deflection angle when the sample voltage=−2.6 kV (electron beam 6=+3.0 kV). It can be seen from this figure that the deflection angle of the electron beams 6 is linearly changed by the DC voltage applied to the electrode 114 a. From this, it can be seen that the deflection angle can be obtained by calculation or experiment if the electrode voltage, the energy of the electron beams 6 and the sample voltage are known. It can also be seen from this figure that the slant can be observed regardless of the presence of the retarding field. [0074] While the two facing electrodes 114 a and 114 b have been described in FIGS. 3 and 4 for simple explanation, the deflection angle can be changed in optional directions if different DC voltages are applied to the four electrodes 114 a through 114 d, respectively. Thus, it is possible to obtain an optional slant image. In order to obtain the three-dimensional information on the sample S, the slant observing deflecting device 32 must have a very large deflection angle (1� or more) as compared with the deflection angle (about 0.20) of the scanning deflecting device 26. Although FIG. 1 shows an example where a voltage of 0 V is applied to the left electrode 114, the trajectories of the electron beams 6 can be bent if a potential difference occurs between electrodes. [0075] [0075]FIG. 5 is a flow chart showing the procedure for acquiring a secondary electron image using the charged particle beam system 10 shown in FIG. 1. In this figure, steps S1 through S7, S9 and S10 show the procedure for carrying out a pattern slant observing method. [0076] First, irradiation conditions, such as acceleration voltages and beam currents, for the electron beams 6 are set (step S1). Then, the control values of the scanning deflecting device 26 are set (step S2). The setting of these conditions and values is carried out by inputting setting values to the control computer 2. [0077] When a slant image is not intended to be acquired (step S3), the charged particle beam system 10 scans and deflects electron beams 6 to cause the electron beams 6 to be incident on the sample S in a direction perpendicular thereto in the same manner as the conventional manner (step S8). Thus, a secondary electron image is acquired (step S9), and a top-down image is outputted to the monitor 86 (step S10). [0078] When an slant image is intended to be acquired (step S3), a slant angle at which the sample S is to be observed (which will be hereinafter referred to as a “target slant angle”) is inputted from the control computer 2 (step S4). Thus, the control computer 2 calculates a DC voltage, which slants the electron beams 6 at the target slant angle, on the basis of the irradiation conditions, sample applied voltage and so forth by means of an calculation part (not shown), and then, supplies a control signal to the slant observing deflection control part 62 (step S5). The slant observing deflection control part 62 sets a DC voltage value on the basis of the control signal, and the set DC voltage is applied to the corresponding electrostatic electrodes 114 of the slant observing deflecting device 32 (step S6). As a result, as described above, the electron beams 6 are deflected by the ununiform electric field, which is formed by the slant observing deflecting device 32, while being scanned and deflected by the electric field of the objective lens 28, so that the electron beams 6 are obliquely incident on the sample S (step S7). Thereafter, secondary electrons and so forth, which are generated from the sample S by the incidence of the electron beams 6, are incorporated into the secondary electron detector 82 to acquire a secondary electron image (step S9) to display a slant image on the monitor 86 (step S10). [0079] Furthermore, in the slant observing deflecting device 32 of the charged particle beam system 10 shown in FIG. 1, the number of the electrodes 114 may be changed in accordance with uses. If the direction to be slanted is one direction, the number of the electrodes 114 may be at least one, and if it is required to obtain slant images in optional directions, the number of the electrodes 114 must be four or more. [0080] While the electrostatic deflecting device and electrodes having excellent rapid deflection and linearity have been used in the above described first preferred embodiment, the combination of a magnetic deflecting device and a coil may be used for bending the trajectories of the electron beams 6 to observe the slant. [0081] (2) Second Preferred Embodiment [0082] Referring to the accompanying drawing, the second preferred embodiment of a charged particle beam system according to the present invention will be described below. [0083] [0083]FIG. 6 is a schematic diagram showing the construction of a charged particle beam system 20 in this preferred embodiment. As shown in this figure, the charged particle beam system 20 in this preferred embodiment is characterized in that the system 20 further comprises a correction deflection calculating part 64 connected to the slant observing deflection control part 62 and the scanning deflection control part 56, in addition to the construction shown in FIG. 1. Other constructions of the system 10 are substantially the same as those of the charged particle beam system 10 of FIG. 1. Furthermore, the correction deflection calculating part 64 is connected to the control computer 2 and to all of the slant observing deflection control parts 62 and all of the scanning deflection control parts 56 although the details thereof are not shown in the figure. [0084] In the charged particle beam system 10 shown in FIG. 1, although it is possible to obtain a slant image since the electron beams 6 are deflected by the slant observing deflecting device 32, a shift Dev of the irradiation position of the electron beams 6 with which the sample S is irradiated occurs as shown in FIG. 3. In the charged particle beam system 20 shown in FIG. 6, the correction deflection calculating part 64 calculates the quantity of such a shift of the irradiation position (which will be hereinafter referred to as an “irradiation position shift”) and controls the scanning deflecting device 26 via the scanning deflection control part 56 to correct the irradiation position shift. In this preferred embodiment, the control computer 2, the correction deflection control part 64 and the scanning deflecting device 26 constitute an irradiation position shift correcting part. [0085] The procedure for correcting the irradiation position by the charged particle beam system 20 shown in FIG. 6 will be described below. [0086] First, the control computer 2 supplies a slant observing control signal to the slant observing deflection control part 62 and supplies data, such as a deflection angle and energy of electron beams 6, to the correction deflection calculating part 64. As described above in the first preferred embodiment, the slant observing deflection control part 62 receives the control signal from the control computer 2, sets a DC component DC1 and supplies an input signal, which is to be inputted to the slant observing deflecting device 32, to the correction deflection calculating part 64. The correction deflection calculating part 64 calculates an irradiation position shift quantity of the electron beams 6 using data on the deflection angle and energy of the electron beams 6, and the input signal which is to be inputted to the slant observing deflecting device 32, as parameters. On the basis of the calculated results, the correction deflection calculating part 64 supplies a control signal for irradiation position shift correction to the scanning deflection control part 56. Then, the scanning deflection control part 56 sets DC components DC1 a through DC1 d capable of correcting the irradiation position shift of the electron beams 6. The DC voltage component DC1 is applied to the electrode 114 of the slant observing deflecting device 32, and the DC components DC1 a through DC1 d are simultaneously applied to the scanning deflecting devices 26 a through 26 d. In the embodiment shown in FIG. 6, the DC components DC1 c and DC1 d have a value of 0. As a result, the trajectories 8 of the electron beams 6 are shifted in a direction, in which the irradiation position shift is corrected, so that it is possible to avoid the shift of the observation region by the slant deflection. [0087] (3) Third Preferred Embodiment [0088] Referring to the accompanying drawing, the third preferred embodiment of a charged particle beam system according to the present invention will be described below. [0089] [0089]FIG. 7 is a schematic diagram showing the construction of a charged particle beam system 30 in this preferred embodiment. As shown in this figure, the charged particle beam system 30 in this preferred embodiment is characterized in that the system 30 further comprises a correction deflection calculating part 66 and an objective lens correction control part 68, in addition to the construction shown in FIG. 1. The correction deflection calculating part 66 is connected to the control computer 2 and to all of the scanning deflection control parts 56, the objective lens correction control part 68 and the slant observing deflection control part 62. Other constructions of the system 30 are substantially the same as those of the charged particle beam system 10 of FIG. 1. [0090] In the charged particle beam system 20 shown in FIG. 1, there is no problem when the magnitude of the irradiation position shift is small, e.g., a few μm. However, the magnitude increases to, e.g., tens μm, the trajectories 8 of the electron beams 6 are greatly spaced from the center of the objective lens 28, so that electron-optical characteristics may deteriorate. In this preferred embodiment, the trajectories 8 of the electron beams 6 are shifted by the scanning deflecting device 26, and the center of the objective lens 28 is shifted to the position after the trajectories 8 of the electron beams 6 are shifted, so that a deterioration of an electron-optics property is prevented. [0091] The procedure for correcting an irradiation position shift in the charged particle beam system 30 shown in FIG. 7 will be described below. [0092] First, the control computer 2 supplies data on a deflection angle and energy of the electron beams 6 to the slant observing deflection control part 62 and the correction deflection calculating part 66. The slant observing deflection control part 62 sets a DC voltage component DC1 as an input signal which is to be inputted to the electrode 114 of the slant observing deflecting device 32 and supplies the input signal to the correction deflection calculating part 66. The correction deflection calculating part 66 calculates an irradiation position shift quantity of the electron beams 6 using data on the deflection angle and energy of the electron beams 6, and the input signal which is to be inputted to the slant observing deflecting device 32, as parameters. On the basis of the calculated results, the correction deflection calculating part 66 supplies a control signal for irradiation position shift correction to the scanning deflection control part 56 and the objective lens correction control part 68. Then, the DC voltage component DC1 is applied to one of the electrodes 114 of the slant observing deflecting device 32 (the right electrode in the embodiment of FIG. 7), and the DC voltage components DC1 is applied to a corresponding electrode of each of the scanning deflecting devices 26 (the right electrode in the embodiment of FIG. 7). Simultaneously, the objective lens correction control part 68 controls the objective lens 28 so that the center of the objective lens 28 is shifted to the corrected position of the electron beams 6. Thus, the central portion of the objective lens 28 is coincident with the trajectories 8 of the electron beams 6. [0093] Thus, according to this preferred embodiment, the irradiation position shift is corrected by both of the scanning deflecting device 26 and the objective lens 28, so that it is possible to observe a slant image while maintaining the electron-optics property even if the slant angle of the electron beams 6 is large to greatly change the observation position. [0094] (4) Fourth Preferred Embodiment [0095] Referring to the accompanying drawing, the fourth preferred embodiment of a charged particle beam system according to the present invention will be described below. [0096] [0096]FIG. 8 is a schematic diagram showing the construction of a charged particle beam system 40 in this preferred embodiment. As can be seen from the comparison with the charged particle beam system 30 shown in FIG. 7, the charged particle beam system 40 in this preferred embodiment is characterized in that the system 40 further comprises an objective lens holding part 92, and an objective lens holding control part 98 substituted for the objective lens correction control part 68. Other constructions of the charged particle beam system 40 are substantially the same as those of the charged particle beam system 30 of FIG. 7. [0097] The objective lens holding part 92 holds the objective lens 28, and receives a control signal from the objective lens holding control part 98 to move the objective lens 28 on a plane perpendicular to the beam axis 8 during a slant observation. That is, the correction deflection calculating part 66 calculates an irradiation position shift quantity to supply a control signal for irradiation position shift correction to the scanning deflecting control part 56 and the objective lens holding control part 98. Then, a DC voltage component DC1 is applied to one of the electrodes 114 of the slant observing deflecting device 32 (the right electrode in the embodiment of FIG. 8), and the DC voltage components DC1 is applied to a corresponding electrode of each of the scanning deflecting devices 26 (the right electrode in the embodiment of FIG. 8) by the scanning deflecting part 56. Simultaneously, the objective lens holding control part 98 moves the objective lens 28 by a distance according to the magnitude of the irradiation position shift quantity in a direction, in which the irradiation position of the electron beams 6 is shifted, on the basis of a control signal from the correction deflection calculating part 66. Thus, the central portion of the objective lens 28 is coincident with the trajectories 8 of the electron beams 6. [0098] Thus, also according to this preferred embodiment, the irradiation position shift is corrected by both of the scanning deflecting device 26 and the objective lens 28, so that it is possible to observe a slant image while maintaining an electron-optics property even if the observation position is greatly changed due to a large slant angle of the electron beams 6. [0099] (5) Fifth Preferred Embodiment [0100] Referring to the accompanying drawing, the fifth preferred embodiment of a charged particle beam system according to the present invention will be described below. [0101] [0101]FIG. 9 is a schematic diagram showing the construction of a charged particle beam system 50 in this preferred embodiment. As shown in this figure, the charged particle beam system 50 in this preferred embodiment is characterized in that the system 50 further comprises a stage control part 72 for controlling the stage 42, so that the irradiation position shift of the electron beams 6 is corrected by the movement of the stage. Other constructions of the charged particle beam system 50 are substantially the same as those of the charged particle beam system 10 of FIG. 1. In this preferred embodiment, the control computer 2 also constitutes an irradiation position shift quantity calculating part. [0102] The procedure for correcting the irradiation position shift of the electron beams 6 by the charged particle beam system 50 shown in FIG. 9 will be described below. [0103] First, the control computer 2 calculates an irradiation position shift quantity of the electron beams 6 using an input signal which is to be inputted to the slant observing deflecting device 62, and data on a deflection angle and energy of the electron beams 6, as parameters. On the basis of the calculated results, the control computer 2 supplies a control signal for irradiation position shift correction to the stage control part 72. This control signal includes information on a direction, in which the irradiation position is shifted, and on the distance between the original irradiation position, at which the sample is vertically irradiated with the electron beams 6, and a position at which the slant electron beams 6 reach the surface of the sample. The stage control part 72 feeds a movement command to the stage 42 on the basis of the control signal. Thus, the stage 42 moves in the calculated direction by the calculated distance. As shown in FIG. 8, the stage 42 can move the sample S from a position, at which observation is carried out before the electron beams 6 are slanted and deflected, so that the target position is displayed on the slant image on the monitor. [0104] Thus, according to this preferred embodiment, the irradiation position shift is corrected by the movement of the stage 42, so that no additional operation is required for the electron-optical system mainly including the scanning deflecting device 28 and the objective lens 28. For that reason, it is possible to observe a slant image without fearing a deterioration of an electron-optics property. [0105] (6) Sixth Preferred Embodiment [0106] [0106]FIG. 10 is a schematic diagram showing the sixth preferred embodiment of a charged particle beam system according to the present invention. The charged particle beam system 60 shown in this figure is characterized in that the system 60 further comprises an image processing control part 88 in addition to the construction of the charged particle beam system 10 shown in FIG. 1, so that the irradiation position shift of the electron beams 6 is corrected by the image processing. Other constructions of the charged particle beam system 60 are substantially the same as those of the charged particle beam system 10 of FIG. 1. Also in this preferred embodiment, the control computer 2 also constitutes an irradiation position shift quantity calculating part. [0107] Referring to FIGS. 11A through 11C, the procedure for correcting the irradiation position shift by the charged particle beam system 60 shown in FIG. 10 will be described below. [0108] [0108]FIG. 11A shows a state that electron beams 6 are obliquely incident on the surface of a sample by the procedure shown in FIG. 5. In the example of FIG. 11A a pattern having two protrusions substantially at the center on the top face of a sample S is formed. If the electron beams 6 are incident on the surface of the sample S in a direction perpendicular thereto in accordance with the conventional image acquiring method, the pattern of the surface of the sample S is displayed on the central portion of the display screen of the monitor 86. In this preferred embodiment, since the electron beams 6 are incident on the sample S at a predetermined slant angle, a slant image M1 is displayed on the screen so as to be shifted by Dev′, which corresponds to an irradiation position shift quantity Dev, in the opposite direction to a direction in which the irradiation position is shifted from the center of the monitor screen. [0109] The control computer 2 calculates an irradiation position shift quantity of the electron beams 6 using an input signal which is to be inputted to the slant observing deflection control part 62, and data on a deflection angle and energy of the electron beams 6, as parameters, and supplies the calculated results to the image processing control part 88. On the basis of the calculated results, the image processing control part 88 supplies a control signal for image correction to the image processing part 84. Then, the image processing part 84 excessively incorporates an image so as to include Dev′ corresponding to the irradiation position shift as shown in the upper portion of FIG. 11C, and then, incorporates an image again at a position, at which the shift quantity Dev′ is shifted, as shown by the arrow in the left direction in this figure. Thus, as shown in the lower portion of FIG. 11C, the shift quantity is corrected, so that a slant image M2 at the target position is observed at the center of the screen. Furthermore, the correction using the image processing should not be limited to the above-described method. For example, the image may be cut by the shift quantity due to the slant deflection and may be displayed in a smaller region than the usual region on the screen. [0110] (7) Seventh Preferred Embodiment [0111] Referring to the accompanying drawing, the seventh preferred embodiment of a charged particle beam system according to the present invention will be described below. [0112] [0112]FIG. 12 is a schematic diagram showing the construction of a charged particle beam system 70 in this preferred embodiment. As can be seen from the comparison with the charged particle beam system shown in FIG. 1, the charged particle beam system 70 further comprises two stages of slant observing deflecting devices 33, 34 and slant observing deflection control parts 63, 64, which are provided between the objective lens 28 and the sample S substituted for the scanning deflecting device and scanning deflection control part between the condenser lens 22 and the objective lens 28. The slant observing deflecting devices 33 and 34 substantially have the same construction as that of the above described slant observing deflecting part 32. Other constructions of the charged particle beam system 70 are substantially the same as those of the charged particle beam system 10 shown in FIG. 1. [0113] This preferred embodiment is characterized in that the scanning and slant deflection of the electron beams 6 are simultaneously carried out by the two stages of slant observing deflecting devices 33 and 34. This will be described in detail below. [0114] The electron beams 6 produced by the electron gun part to pass through the condenser lens 22 are focused by the objective lens 28 so as to form an image on the top face of the sample S. The slant observing deflecting devices 33 and 34 arranged between the objective lens 28 and the sample S are connected to the slant observing deflection control part 63 and 64, respectively. The slant observing deflection control part 64 in the upper stage (on the side of the objective lens 28) sets scanning AC voltage components ACb and ACd on the basis of a command signal from the control computer 2 as shown in the respective waveform illustrations on both sides of FIG. 12, and applies the set scanning AC voltage components ACb and ACd to the slant observing deflecting device 34 in the upper stage. On the other hand, the slant observing deflection control part 63 in the lower stage (on the side of the sample) sets voltages, which are obtained by adding slanting DC components DC1 and DC0 (=0) to scanning AC voltage components ACa and ACc on the basis of a command signal from the control computer 2 as shown in the waveform illustrations of the figure, and applies the set voltages to the slant observing deflecting device 34. Thus, the scanning deflection and slant observing deflection of the electron beams 6 can be simultaneously controlled. Furthermore, at this time, as the scanning AC components, signals of different levels are inputted to the facing electrodes in the respective slant observing deflecting devices 33 and 34, so that the deflection angle and deflection direction are controlled. [0115] (8) Eighth Preferred Embodiment [0116] Referring to the accompanying drawing, the eighth preferred embodiment of a charged particle beam system according to the present invention will be described below. [0117] [0117]FIG. 13 is a schematic diagram showing the construction of a charged particle beam system 80 in this preferred embodiment. As can be seen from the comparison with the charged particle beam system 70 shown in FIG. 12, the charged particle beam system 80 further comprises two stages of correction deflecting devices 27 provided above the objective lens 28, correction deflection control parts 57 connected to the correction deflecting devices 27, respectively, and a correction deflection calculating part 66. The correction deflection calculating part 66 is connected to the control computer 2, and to all of the slant observing deflection control part 63 in the lower stage and the correction deflection control parts 57. Other constructions of the charged particle beam system 80 are substantially the same as those of the charged particle beam system 70 shown in FIG. 12. [0118] This preferred embodiment is characterized in that the scanning deflection and slant observing deflection of the electron beams 6 are simultaneously carried out by the slant observing deflecting device 33 and the slant observing deflection control part 63, and that the irradiation position shift of the electron beams 6 due to slant is corrected by the correction deflection calculating part 66, the correction deflecting device 27 and the correction deflection control part 57. The procedure for correcting the irradiation position shift using the charged particle beam system 80 will be described below. [0119] First, the control computer 2 supplies data on a deflection angle and energy of the electron beams 6 to the correction deflection calculating part 66. The slant observing deflection control parts 63 and 64 also supply input signals, which are to be inputted to the slant observing deflecting devices 33 and 34 respectively, to the correction deflection calculating part 66. The correction deflection calculating part 66 uses these data as correcting parameters to calculate an irradiation position shift quantity of the electron beams 6. On the basis of the calculated results, the correction reflection calculating part 66 supplies a control signal for irradiation position shift correction to the correction reflection control part 57. On the basis of this control signal, the correction reflection control part 57 sets DC current components DC2 a, DC2 b, DC0 (=0) and DC0 (=0) capable of correcting the irradiation position shift and applies the current components to the corresponding electrodes of the correction deflecting device 27 respectively. In the embodiment of FIG. 13, the current components DC2 a and DC2 b are applied to the right electrodes of the correction deflecting device 27. Thus, the trajectories of the electron beams 6 are shifted in a direction in which the irradiation position shift is corrected by the correction deflecting device 27. As a result, it is possible to avoid the shift in the observation region due to deflection. [0120] (9) Ninth Preferred Embodiment [0121] Referring to the accompanying drawing, the ninth preferred embodiment of a charged particle beam system according to the present invention will be described below. [0122] [0122]FIG. 14 is a schematic diagram showing the construction of a charged particle beam system in the ninth preferred embodiment according to the invention. As can be seen from the comparison with the charged particle beam system 70 shown in FIG. 12, the charged particle beam system 90 in this preferred embodiment further comprises a correction deflection calculating part 66 connected to two stages of slant observing deflection control parts 63 and 64. Other constructions of the charged particle beam system 90 are substantially the same as those of the charged particle beam system 70 shown in FIG. 12. [0123] This preferred embodiment is characterized in that the scanning deflection and slant observing deflection of the electron beams 6 and the correction of the irradiation position shift of the electron beams 6 due to slant are simultaneously carried out by the slant observing deflecting devices 33, 34 and the slant observing deflection control parts 63, 64. The procedure for correcting the irradiation position shift using the charged particle beam system 90 will be described below. [0124] The correction deflection calculating part 66 receives a signal of a slanting DC component DC1, which is fed back from the lower-stage slant observing deflection control part 63, to calculates DC components DC2 a through DC2 d for correcting an irradiation position shift, supplies a control signal for causing the DC components DC2 a and DC2 c to the lower-stage slant observing deflection control part 63 and supplies a control signal for causing the DC components DC2 b and DC2 d to the upper-stage slant observing deflection control part 64. Thus, in the embodiment of FIG. 14, the DC components DC2 a and DC2 b are applied to the right electrodes of the slant observing deflecting devices 33 and 34 respectively. In the embodiment of this figure, the DC components DC2 c and DC2 d are DC0 (=0). The respective electron beams 6 pass through the objective lens 28 to pass through the upper-stage slant observing deflecting device 34 and lower-stage slant observing deflecting device 33 which are provided between the objective lens 28 and the sample S. A signal obtained by synthesizing three components of a scanning AC component ACa, the slanting DC component DC1 and the correcting DC component DC2 a, which is fed back from the correction deflection calculating part 66, is set by the lower-stage slant observing deflection control part 63 to be inputted to one of the electrodes 144 of the lower-stage slant observing deflecting device 33 (the right electrode in the embodiment of FIG. 14). On the other hand, a signal obtained by synthesizing two components of a scanning AC component ACb and the correcting DC component DC2 b is set by the upper-stage slant observing deflection control part 64 to be inputted to a corresponding one of the electrodes 144 of the upper-stage slant observing deflecting device 34 (the right electrode in the embodiment of FIG. 14). By thus setting and inputting the signals to the respective deflecting devices 33 and 34, the scanning deflection and slant observing deflection of the electron beams 6, and the correction of the irradiation position shift can be simultaneously controlled. At this time, as the scanning AC component Ac, the signals having the same level are inputted to the facing electrodes in the deflecting device. On the other hand, as the slant observing DC component DC, the signals having different levels are inputted to the facing electrodes in the deflecting device. Thus, the deflection angle and the deflection direction are controlled. In order to correct the irradiation position shift, although DC components having different levels are inputted to the facing electrodes in the deflecting device similar to the slant observing DC component, it is required that the trajectories of the electrode beams 6 are not bent in the scanning deflection. [0125] While some preferred embodiments of the present invention have been described, the present invention should not be limited to the above-described embodiments, but the invention can be embodied in various ways without departing from the scope of the invention. While the irradiation position shift quantity has been calculated by the correction deflection calculating part in the above described second, third, eighth and ninth preferred embodiments, the irradiation position shift quantity may be calculated by the control computer similar to the fifth and sixth preferred embodiments. While the electron beams have been used as charged particle beams, ion beams due to ions other than electrons may be used. 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INTEREST;ASSIGNORS:ABE, HIDEAKI;YAMAZAKI, YUICHIRO;SUGIHARA, KAZUYOSHI;AND OTHERS;REEL/FRAME:011632/0923Effective date: 20010322Owner name: KABUSHIKI KAISHA TOPCON, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ABE, HIDEAKI;YAMAZAKI, YUICHIRO;SUGIHARA, KAZUYOSHI;AND OTHERS;REEL/FRAME:011632/0923Effective date: 20010322Sep 18, 2006FPAYFee paymentYear of fee payment: 4Sep 20, 2010FPAYFee paymentYear of fee payment: 8Oct 24, 2014REMIMaintenance fee reminder mailedMar 18, 2015LAPSLapse for failure to pay maintenance feesMay 5, 2015FPExpired due to failure to pay maintenance feeEffective date: 20150318RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services