WO2010134259A1 - 電子銃 - Google Patents
電子銃 Download PDFInfo
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- WO2010134259A1 WO2010134259A1 PCT/JP2010/002684 JP2010002684W WO2010134259A1 WO 2010134259 A1 WO2010134259 A1 WO 2010134259A1 JP 2010002684 W JP2010002684 W JP 2010002684W WO 2010134259 A1 WO2010134259 A1 WO 2010134259A1
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- WIPO (PCT)
- Prior art keywords
- electron gun
- field emission
- electron beam
- electron
- cathode
- Prior art date
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- 238000010894 electron beam technology Methods 0.000 claims abstract description 58
- 238000000605 extraction Methods 0.000 claims abstract description 56
- 230000000694 effects Effects 0.000 claims abstract description 11
- 230000005684 electric field Effects 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 2
- 230000004075 alteration Effects 0.000 abstract description 14
- 239000000284 extract Substances 0.000 abstract description 2
- 238000007654 immersion Methods 0.000 description 19
- 230000001133 acceleration Effects 0.000 description 9
- 239000000523 sample Substances 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 238000000921 elemental analysis Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
- H01J37/06—Electron sources; Electron guns
- H01J37/063—Geometrical arrangement of electrodes for beam-forming
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
- H01J37/06—Electron sources; Electron guns
- H01J37/073—Electron guns using field emission, photo emission, or secondary emission electron sources
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
- H01J37/10—Lenses
- H01J37/14—Lenses magnetic
- H01J37/141—Electromagnetic lenses
-
- 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
- H01J2237/06—Sources
- H01J2237/063—Electron sources
- H01J2237/06308—Thermionic sources
- H01J2237/06316—Schottky emission
-
- 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
- H01J2237/06—Sources
- H01J2237/063—Electron sources
- H01J2237/06325—Cold-cathode sources
- H01J2237/06341—Field emission
-
- 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
- H01J2237/06—Sources
- H01J2237/065—Source emittance characteristics
-
- 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
- H01J2237/26—Electron or ion microscopes
Definitions
- the present invention relates to an electron gun, and more particularly to a cold cathode field emission (Cold-FE) electron gun that generates a high-intensity electron beam.
- Cold-FE cold cathode field emission
- An electron microscope irradiates a substance (sample) to be observed while controlling an electron beam emitted from an electron gun using an electron optical system such as an electron lens or a deflector. Then, the principle is to detect the transmitted electrons transmitted through the irradiated sample, the reflected electrons generated by the interaction between the sample and the electron beam, and the secondary electrons, and to perform an enlarged observation of the sample. In this electron microscope, the role of the electron gun responsible for generating the electron beam is significant.
- a typical structure of an electron microscope includes an electron gun that generates an electron beam, and combines an irradiation system, an electromagnetic lens such as an objective lens, and an electron beam detection device.
- the electromagnetic lens plays a role of transporting and converging the electron beam to irradiate the sample.
- the luminance of the electron beam is defined as the amount of current per area per solid angle of the light source.
- the luminance of the electron beam transported without changing the energy by an electromagnetic lens or the like is The brightness cannot be exceeded. For this reason, in order to obtain a higher-brightness electron microscope, a high-brightness electron gun is required.
- Cold cathode field emission (C-FE) electron guns are widely used as electron microscopes having high resolution as high-intensity electron guns.
- the principle of electron beam generation of this electron gun is that a strong electric field is generated at the tip of a tungsten single crystal that is sharply sharpened by electropolishing, and the electron beam is drawn out by this strong electric field.
- the cold cathode field emission electron gun is closer to a point light source than other electron sources, and can obtain a high-intensity electron beam, as well as energy variations (energy width ⁇ E) of individual electrons in the extracted electron beam. Can be obtained.
- FIG. 1 The structure of a typical cold cathode field emission electron gun equipped with a Butler type electrostatic lens is shown in FIG.
- a potential difference (V 1 ) between the electron source 101 and the extraction electrode 110 is applied by the extraction power source 105, and an electric field generated at the tip of the electron source 101 (the lowest part of the electron source 101 in the drawing) causes an electric field at the electron source 101. Emission occurs and an electron beam is emitted.
- the electron beam that has passed through the aperture 109 provided in the extraction electrode 110 is a static electric field formed by the Butler-type electrodes 103 and 104 provided between the extraction electrode 110 and the anode 107.
- This structure can easily make the structure of the electron gun relatively small, and therefore has an advantage in realizing an ultra-high vacuum. Further, there is an advantage in that the electrostatic lens can simultaneously accelerate and converge the electron beam.
- the total amount of current that can be extracted from this electron gun is lower than that of other electron sources such as a Schottky electron source, and it is necessary to use an electron beam that emits from a chip at a wide angle when trying to extract a large current.
- the luminance effective luminance
- This phenomenon occurs remarkably when trying to extract a larger current. It is difficult to reduce this aberration with an electrostatic lens.
- an electron gun for converging an electron beam using a magnetic lens has been devised for the purpose of improving the brightness of the electron gun.
- Patent Document 1 there is a type called an electron source that is in a magnetic field (immersion type) in terms of aberration reduction, rather than a lens in which a converging lens by a magnetic field is provided directly under an electron gun.
- Immersion type a type in which a converging lens by a magnetic field is provided directly under an electron gun.
- Numerous devices have been devised, and as shown in Patent Documents 2 to 7, there are known examples of their detailed structures.
- the structure shown in these known examples generally shows a hot cathode field emission electron gun, and there is a big difference between these and the cold cathode field emission electron gun, with or without a suppressor.
- the suppressor which is characteristic of the hot cathode field emission electron gun, has a negative potential applied to the electron source, and reflects the thermoelectrons emitted from the heated filament in the vicinity of the electron source. , Have the role of confining in the suppressor.
- the filament is not heated, and no thermoelectrons are emitted, so a suppressor is unnecessary.
- the only electrode provided in the vicinity of the electron source in the cold cathode field emission electron gun is the extraction electrode, which generates a large electric field at the tip of the electron source and causes field emission from the tip.
- the optimum structure differs greatly between the hot cathode field emission electron gun and the cold cathode field emission electron gun. Even if the structure of the example is applied to a cold cathode field emission electron gun as it is, high performance cannot be exhibited.
- the present invention relates to a field emission electron gun for extracting an electron beam from a cathode and converging the extracted electron beam.
- the field emission electron gun includes a magnetic lens so that the cathode is arranged in a lens magnetic field, and is used for extracting electrons from the cathode.
- the electrode is formed in a cylindrical shape without a diaphragm structure.
- the magnetic field lens is provided so that the cathode is arranged in the lens magnetic field, and the convergence effect by the electric field formed between the extraction electrode for extracting electrons from the cathode and the anode for accelerating the electron beam is obtained.
- the magnetic lens has a large convergence effect due to the magnetic field.
- an electron gun having a function of converging an electron beam using a magnetic field an accompanying electrostatic lens action can be reduced, and an electron gun with low aberration and high brightness can be provided.
- the structure of a cold cathode field emission electron gun provided with a Butler type electrostatic lens.
- the structure of the immersion type cold cathode field emission electron gun which is one Embodiment of this invention.
- the structure of the immersion type cold cathode field emission electron gun which is one Embodiment of this invention.
- the structure of the immersion type cold cathode field emission electron gun which is one Embodiment of this invention.
- 1 shows a structure of an immersion type electron gun for an electron gun having an acceleration voltage of 100 kV to 300 kV and including an acceleration tube according to an embodiment of the present invention.
- the structure of the immersion type cold cathode field emission electron gun which is one Embodiment of this invention. Relationship between the voltage applied to the cylindrical extraction electrode and the electric field strength at the tip of the tip.
- Theoretical analysis results of the luminance of a magnetic field immersion type cold cathode field emission electron gun and the luminance of a cold cathode field emission electron gun equipped with a Butler type electrostatic lens. Comparison of luminance of magnetic field immersion type cold cathode field emission electron gun and luminance when the minimum inner diameter of the extraction electrode opening is ⁇ 1 mm and ⁇ 2 mm.
- FIG. 1 an embodiment of an immersion type cold cathode field emission electron gun is shown in FIG.
- FIG. 2 shows the structure of the electron gun according to the present invention.
- the electron source 101, the electron source holding unit 102, the extraction electrode 203, the anode 204, the magnetic path 207, and the permanent magnet 209 are in a vacuum container (not shown) and are maintained at an ultrahigh vacuum of about 10 ⁇ 8 Pa.
- the acceleration power supply 106 applies a potential V 0 (negative potential) to the electron source 101 with respect to the ground portion 108.
- the extraction power source 105 applies a voltage V 1 (positive voltage, several kV) to the extraction electrode 203 with reference to the electron source potential. This potential (V 1 ) causes field emission, and an electron beam (with energy V 0 -V 1 ) is emitted from the electron source 101.
- This electron beam is converged by the magnetic field generated in the electron beam path by the magnetic lens, in this embodiment the permanent magnet 209 and the magnetic path 207, and accelerated toward the anode 204.
- the magnetic lens is generated not by an electromagnet but by a permanent magnet 209, which is selected because of difficulty in introducing the electromagnet into the ultrahigh vacuum and high voltage portion of the electron gun.
- the magnetic field created by the permanent magnet 209 and the magnetic path 207 formed of a high permeability material such as permalloy is static and the intensity cannot be adjusted, but by moving the position of the electron source 201 up and down relative to the magnetic field, Effective magnetic lens intensity can be changed, and this can be used to adjust electro-optical conditions such as virtual light source position.
- the electron source holding unit 102 has a position adjusting mechanism (not shown).
- the extraction electrode 203 has a cylindrical shape without an aperture structure with the anode side open. Since the role of the extraction electrode is to generate a high electric field at the tip of the electron source, it seems that the extraction electrode needs to be positioned between the electron source and the anode. As shown in FIG. 1, which shows a typical structure of a conventional cold cathode field emission electron gun, the extraction electrode is an example in which a cup-type structure having a diaphragm structure on the anode side of the electron source, such as 110, is used. There are many.
- the extraction electrode 203 has no diaphragm structure.
- the electron source 101 has a sharp point with a diameter of several micrometers, while the extraction electrode has a macroscopic structure of 10 to several tens of millimeters.
- the radius of curvature of the hemispherical shape of the cathode tip is r ( ⁇ 1 ⁇ m)
- the distance between the anode and the cathode is R ( ⁇ 10 mm)
- the potential difference between the anode and the cathode is V
- the electric field strength F applied to the tip of the cathode is Is expressed by the following equation.
- FIG. 8 shows the relationship (theoretical analysis results) between the applied voltage and the electric field strength at the tip of a certain cylindrical extraction electrode.
- the horizontal axis is the extraction electrode inner diameter ⁇ d, and the vertical axis is the extraction voltage (V 1 ) necessary for generating an electric field of 4 ⁇ 10 19 V / m (calculated value) at the tip of the chip.
- the advantage of making the extraction electrode cylindrical without an aperture structure is that the potential gradient discontinuity generated in the aperture area is eliminated, and the electrostatic lens effect existing between the extraction electrode 203 and the anode 204 is reduced. It is to be done.
- the advantage of the present invention is to reduce the aberration of the entire electron gun by converging with a magnetic lens instead of an electrostatic lens structure having large aberrations. At this time, it is desirable to reduce the convergence effect by the electric field as much as possible. .
- the convergence force due to the electric field can be weakened, and as a result, aberration can be reduced.
- FIG. 9 shows the result of theoretical analysis of the luminance of a magnetic field immersion type cold cathode field emission electron gun assuming a certain shape compared with a conventional cold cathode field emission type electron gun (not a magnetic field immersion type).
- the horizontal axis of the graph is the probe current, and the vertical axis is the luminance obtained from the analysis.
- the brightness of the electron gun matches the on-axis brightness, and the brightness is the same as that of the immersion electron gun or the conventional electron gun. (The right end of the graph).
- the amount of extraction current is increased by collecting the current emitted at a large angle, the luminance starts to decrease due to the influence of the aberration of the electron gun.
- a magnetic field immersion type cold cathode field emission electron gun with small aberrations can extract even higher current while maintaining luminance.
- the immersion cold cathode field emission electron gun can obtain a higher current amount while maintaining the same luminance about 10 times as much as the extracted current amount at which the luminance starts to decrease.
- the electron beam is mainly focused by a magnetic lens while the focusing force and aberration by the electric field lens are kept low even if the shape of the extraction electrode is not completely cylindrical and has a slight aperture structure. You can achieve your goal.
- the protruding electrode 303 is provided with a protrusion to such an extent that a lens action due to an electric field does not occur.
- the minimum inner diameter 310 of the extraction electrode opening is 2 mm or more.
- FIG. 9 An example of the theoretical analysis result assuming the shape is shown in FIG. The theoretical analysis results when the inner diameter ds of the minimum portion is 1 mm ⁇ and 2 mm ⁇ are superimposed on the graph of FIG. 9.
- the inner diameter of the minimum portion is 1 mm ⁇
- the luminance is reduced to a state that is almost the same as that of the conventional cold cathode field emission electron gun. If it is 2mm ⁇ , the decrease in luminance is reduced and it approaches the immersion type electron gun (cylindrical electrode), but in order to take advantage of the immersion type electron gun, the inner diameter of the minimum part must be at least 2 mm or more. I understand.
- the electron beam is mainly converged by the magnetic field lens while the convergence force and aberration by the electric field lens are kept low regardless of whether the anode side end of the extraction electrode is on the anode side or the cathode side with respect to the electron source. Aim can be achieved.
- FIG. 4 and FIG. 5 show other examples regarding the position of the extraction electrode end.
- the extraction electrode 403 extends to the anode 404 side than the extraction electrode 203 of FIG.
- the permanent magnet 209 and the magnetic path 207 may extend to the anode 204 side from the lower surface of the magnetic path 410. In this case, the electric field lens effect is not so great.
- the end of the extraction electrode 503 on the anode 204 side of the electron source 101 may be located above (opposite the anode).
- FIG. 7 is given as a modification of FIG. FIG. 7 shows a structure in which the extraction electrode 703 in FIG. 4 is further extended to the anode 204 side and a planar portion is added so as to cover the magnetic path 207.
- the extraction electrode 703 has a shape that covers the magnetic path 207 so as to face the anode 204, and the reflection of scattered electrons 711 that collide with the anode 204 and are scattered hardly reaches the magnetic path 707. According to this structure, gas emission from the magnetic path 707 by the scattered electrons 711 can be prevented.
- the extraction electrode 703 is subjected to a surface treatment such as gold plating so that gas emission is reduced even when the scattered electrons 711 collide, and the heater 710 is sufficiently heated before the electron gun is used for degassing.
- the heater 710 and the extraction electrode 703 are preferably provided with a gap between the magnetic path 207 or a heat insulating material so as to be thermally insulated from the magnetic path 207. This is because the possibility of thermal demagnetization of the permanent magnet 709 can be reduced by heating the heater 710.
- Example 1-3 can be easily applied to an electron gun having an acceleration tube at a higher pressure.
- FIG. 6 shows the structure of an immersion gun of an electron gun having an acceleration tube and having an acceleration voltage of 100 kV to 300 kV. Also in this structure, V 0 is applied to the electron source 601 and the potential V 1 with respect to the electron source 101 is applied to the extraction electrode 603, and the electron beam is extracted from the electron source. This electron beam is initially accelerated by the potential difference with the second anode 604 having a potential of V 2 with respect to the electron source, and further to the anode 614 having the ground potential, inside an accelerating tube (not shown) provided with intermediate electrodes 610 to 613. Will be accelerated.
- the electron beam path diameters of the second anode 604 and the intermediate electrodes 610 to 613 are made at least as large as those of the extraction electrode 303 of FIG. 3, and the lens effect produced by the acceleration electric field is kept low.
- the heater 210 is provided in the vicinity of the anode 204, and the emitted gas can be suppressed by heating the parts of the anode 204 in a vacuum before the operation of the electron gun.
- the emitted gas can be suppressed in the cold cathode field emission electron gun having the accelerating tube of FIG. 6, if the heater 617 is provided in the vicinity of the anode 614, the emitted gas can be suppressed.
- a permanent magnet is used as the magnetic field lens for converging the electron beam.
- an example is shown in which a permanent magnet is disposed in an empty container and the vacuum container is disposed in the electron gun chamber. According to such a configuration, the effect of the present application can be obtained without degrading the degree of vacuum in the electron gun chamber even if the samarium cobalt magnet is not subjected to the titanium nitride coating treatment.
- the present invention is not limited to the above method, and if a permanent magnet coated with titanium nitride (for example, a samarium cobalt magnet) is used, it can be directly brought into the electron gun chamber without deteriorating the vacuum degree of the electron gun chamber. I found out as a result of the experiment. A permanent magnet can also be arranged outside the electron gun chamber. Even with such a configuration, the effect of the present application can be obtained without degrading the degree of vacuum in the electron gun chamber.
- a permanent magnet coated with titanium nitride for example, a samarium cobalt magnet
- the present invention When an effective luminance equivalent to that of a normal cold cathode field emission electron gun is to be obtained under all use conditions of an electron microscope, the present invention has a total radiation current amount as compared with a conventional cold cathode field emission electron gun. Can be taken out while keeping the current value as low as about 1/10. As a result, an electron gun having high performance with high stability of the amount of radiated current and a small energy distribution ⁇ E of radiated electrons can be obtained.
- an electron beam having a small spot diameter and high luminance can be supplied to an electron microscope using a relatively large current of 1 nA or more such as an electron microscope having an elemental analysis function.
- the present invention can be used as an electron source of an electron beam apparatus using other electron beams such as a scanning electron microscope, a transmission electron microscope, and a scanning transmission electron microscope.
- Electron source 102 Electron source holding
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Abstract
Description
Rとrの関係より、電界強度FがほとんどRに関係なく、Vとrのみに依存することがわかる。この非対称性から、電子源先端部分の電場強度は電子源先端径などの電子源構造によりほぼ決まり、引出電極の位置や構造にはほとんど依存しないことが分かった。よって、引出電極が円筒形であっても電界放出は起こり、本発明はこの現象を用いている。
102 電子源保持部
103,104 Butler電極
105 引出電源
106 加速電源
107,204,614 陽極
108 接地部
109 引出電極絞り
110,203,303,403,503,603 引出電極
207 磁路
209 永久磁石
210,617,710 ヒータ
310 引出電極最小開口部内径
410 磁路下面
604 第二陽極
610,611,612,613 中間電極
615 ブリーダー抵抗
616 V2電源
703 引出電極(シールド兼)
711 散乱電子
Claims (10)
- 電子線を陰極から引き出し、引き出された電子線を収束する電界放出型電子銃において、
レンズ磁界中に陰極が配置されるように磁場レンズを備え、陰極から電子を引き出すための引出電極を、絞り構造のない円筒形で構成したことを特徴とする電界放出型電子銃。 - 電子線を陰極から引き出し、引き出された電子線を収束する電界放出型電子銃において、
レンズ磁界中に陰極が配置されるように磁場レンズを備え、陰極から電子を引き出すための引出電極を、陰極と陽極の間に直径2mm以下の絞り部分が存在しない形状にしたことを特徴とする電界放出型電子銃。 - 電子線を陰極から引き出し、引き出された電子線を収束する電界放出型電子銃において、
レンズ磁界中に陰極が配置されるように磁場レンズを備え、陰極から電子を引き出すための引出電極と電子線を加速する陽極の間で形成される電界による収束作用が、前記磁場レンズの磁場による収束作用が大きいことを特徴とする電界放出型電子銃。 - 請求項1から3のいずれかの電界放出型電子銃において、前記磁場レンズは、永久磁石によって構成されることを特徴とする電界放出型電子銃。
- 請求項4の電界放出型電子銃において、前記陰極の位置を移動する移動機構を備えたことを特徴とする電界放出型電子銃。
- 請求項1から3のいずれかの電界放出型電子銃において、電子線を加速する陽極を加熱する加熱手段を備えたことを特徴とする電界放出型電子銃。
- 請求項3において、前記引出電極の下端が前記陽極に対向する面を有することを特徴とする電界放出型電子銃。
- 請求項1から3のいずれかの電界放出型電子銃において、前記引出電極を加熱する加熱手段を備えた電界放出型電子銃。
- 請求項8において、ヒータ加熱により永久磁石が熱減磁することを防ぐため、ヒータおよび引出電極と永久磁石磁路および永久磁石との間に熱絶縁構造を設けたことを特徴とする電界放出型電子銃。
- 電子線により試料を加工,検査する電子線装置において、請求項1から3のいずれかの電界放出型電子銃を搭載した電子線装置。
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Application Number | Priority Date | Filing Date | Title |
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DE112010002063.9T DE112010002063B4 (de) | 2009-05-22 | 2010-04-14 | Feldemissions-Elektronenkanone und Elektronenstrahlvorrichtung mit einer solchen Feldemissions-Elektronenkanone |
US13/322,025 US8669535B2 (en) | 2009-05-22 | 2010-04-14 | Electron gun |
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JP2009-123684 | 2009-05-22 | ||
JP2009123684A JP5386229B2 (ja) | 2009-05-22 | 2009-05-22 | 電子銃 |
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WO2010134259A1 true WO2010134259A1 (ja) | 2010-11-25 |
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PCT/JP2010/002684 WO2010134259A1 (ja) | 2009-05-22 | 2010-04-14 | 電子銃 |
Country Status (4)
Country | Link |
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US (1) | US8669535B2 (ja) |
JP (1) | JP5386229B2 (ja) |
DE (1) | DE112010002063B4 (ja) |
WO (1) | WO2010134259A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US9754760B2 (en) | 2014-12-09 | 2017-09-05 | Hermes Microvision Inc. | Charged particle source |
Families Citing this family (4)
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JP6095338B2 (ja) * | 2012-11-28 | 2017-03-15 | 株式会社日立製作所 | 電子銃および荷電粒子線装置 |
JP6340165B2 (ja) * | 2013-04-25 | 2018-06-06 | 株式会社日立ハイテクノロジーズ | 電子銃、荷電粒子銃およびそれらを用いた荷電粒子線装置 |
US11227740B2 (en) | 2017-09-07 | 2022-01-18 | Hitachi High-Tech Corporation | Electron gun and electron beam application device |
JP6916074B2 (ja) * | 2017-09-20 | 2021-08-11 | 浜松ホトニクス株式会社 | 電子放出管、電子照射装置及び電子放出管の製造方法 |
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- 2010-04-14 US US13/322,025 patent/US8669535B2/en not_active Expired - Fee Related
- 2010-04-14 DE DE112010002063.9T patent/DE112010002063B4/de not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
US20120062094A1 (en) | 2012-03-15 |
JP5386229B2 (ja) | 2014-01-15 |
JP2010272381A (ja) | 2010-12-02 |
DE112010002063T5 (de) | 2012-07-19 |
DE112010002063B4 (de) | 2018-10-04 |
US8669535B2 (en) | 2014-03-11 |
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