JPH0562637A - Secondary electron microscope - Google Patents

Secondary electron microscope

Info

Publication number
JPH0562637A
JPH0562637A JP3253196A JP25319691A JPH0562637A JP H0562637 A JPH0562637 A JP H0562637A JP 3253196 A JP3253196 A JP 3253196A JP 25319691 A JP25319691 A JP 25319691A JP H0562637 A JPH0562637 A JP H0562637A
Authority
JP
Japan
Prior art keywords
electron beam
observed
primary electron
secondary electron
electron microscope
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3253196A
Other languages
Japanese (ja)
Inventor
Masahiko Hiyouzou
正彦 兵三
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP3253196A priority Critical patent/JPH0562637A/en
Publication of JPH0562637A publication Critical patent/JPH0562637A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To provide a secondary electron microscope enabling intermittent radiation of a primary electron beam in order to suppress the electrical change of an observed-substance surface resulting from continuous radiation of a primary electron beam onto the observed substance as in a conventional secondary electron microscope. CONSTITUTION:The secondary electron microscope according to the present invention includes a mechanism composed of a cutoff voltage generator 15 and a cutoff electrode 14 and capable of cutting off a primary electron beam before a primary electron beam 7 is radiated onto an observed substance, thereby preventing the primary electron beam from being continously radiated onto the observed substance so as to make intermittent radiation.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、2次電子顕微鏡(S
EM)に関し、特に被観察物の帯電を抑制できるように
したものに関するものである。
This invention relates to a secondary electron microscope (S
The present invention relates to EM), and more particularly, to a device capable of suppressing charging of an object to be observed.

【0002】[0002]

【従来の技術】図5は従来の2次電子顕微鏡の基本構成
を示したものである。図4において、1は被観察物、2
は電子ビーム源、3は電子ビームのX軸偏向電極、4は
Y軸偏向電極、5はX軸偏向電圧発生器、6はY軸偏向
電圧発生器、7は1次電子ビーム、8は2次電子、9は
2次電子検出器、10は2次電子検出信号増幅器、11
は2次電子像観察用モニタである。図6は2次電子像観
察における、被観察物の1次電子ビームの照射方法につ
いて示したものである。図6において、12は被観察物
上に形成される1次電子ビームの軌跡を示したものであ
り、13は1次電子ビームが照射される領域を示したも
のである。図7はX軸偏向電極に印加されるX軸偏向電
圧の電圧波形を示したものである。図8はY軸偏向電極
に印加されるY軸偏向電圧の電圧波形を示したものであ
る。図9は被観察物の観察領域に照射される1次電子ビ
ームの照射電流と時間の関係を示したものである。
2. Description of the Related Art FIG. 5 shows a basic structure of a conventional secondary electron microscope. In FIG. 4, 1 is an object to be observed, 2
Is an electron beam source, 3 is an electron beam X-axis deflection electrode, 4 is a Y-axis deflection electrode, 5 is an X-axis deflection voltage generator, 6 is a Y-axis deflection voltage generator, 7 is a primary electron beam, and 8 is 2 Secondary electron, 9 is a secondary electron detector, 10 is a secondary electron detection signal amplifier, 11
Is a monitor for observing secondary electron images. FIG. 6 shows a method of irradiating an observed object with a primary electron beam in observing a secondary electron image. In FIG. 6, reference numeral 12 shows the locus of the primary electron beam formed on the object to be observed, and 13 shows the region irradiated with the primary electron beam. FIG. 7 shows the voltage waveform of the X-axis deflection voltage applied to the X-axis deflection electrode. FIG. 8 shows the voltage waveform of the Y-axis deflection voltage applied to the Y-axis deflection electrode. FIG. 9 shows the relationship between the irradiation current of the primary electron beam with which the observation region of the object to be observed is irradiated and the time.

【0003】従来の2次電子顕微鏡においては、図5に
示すように、電子ビーム源2から発生した1次電子ビー
ムをX軸偏向電極3,Y軸偏向電極4によって偏向し
て、被観察物1に照射し、そこから発生する2次電子を
2次電子検出器9によって検出し、2次電子検出信号増
幅器10によって増幅された信号を2次電子像として、
2次電子像観察用モニタ11で観察していた。X軸偏向
電極3にはX軸偏向電圧発生器5から電圧が供給され、
Y軸偏向電極4にはY軸偏向電圧発生器6から電圧が供
給されている。被観察物への1次電子ビームの照射範囲
は図6に示された点線内の領域であり、被観察物上のA
点からB点(X軸方向)に向かって、1次電子ビームが
走査された後、A点からY軸方向にずれたC点から直ち
にD点(X軸方向)に向かって走査される。このような
走査がE点まで行われる。図6に示したA点に1次電子
ビームが照射されるとき、X軸偏向電極に印加される電
圧は図7にV1 で示された電圧であり、同様に、B点の
場合はV2 で示された電圧である。図6に示したA点に
1次電子ビームが照射されるとき、Y軸偏向電極に印加
される電圧は図8にV3 で示された電圧であり、同様
に、E点の場合はV4 で示された電圧である。図6に示
したA点からE点まで、1次電子ビームが照射される時
間は図8に示されているt1 である。図7,図8の電圧
波形に示されているように、電圧波形は時間t1 を1周
期として、連続的に繰り返される。従って、1次電子ビ
ームは図6のA点からE点までを繰り返して連続的に照
射されることがわかる。
In a conventional secondary electron microscope, as shown in FIG. 5, a primary electron beam generated from an electron beam source 2 is deflected by an X-axis deflection electrode 3 and a Y-axis deflection electrode 4 to observe an object to be observed. 1, secondary electrons generated therefrom are detected by the secondary electron detector 9, and the signal amplified by the secondary electron detection signal amplifier 10 is used as a secondary electron image.
It was observed by the monitor 11 for observing the secondary electron image. A voltage is supplied from the X-axis deflection voltage generator 5 to the X-axis deflection electrode 3,
The Y-axis deflection electrode 4 is supplied with a voltage from a Y-axis deflection voltage generator 6. The irradiation range of the primary electron beam to the object to be observed is the area within the dotted line shown in FIG.
After the primary electron beam is scanned from point A to point B (X axis direction), it is immediately scanned from point C deviated from point A in the Y axis direction to point D (X axis direction). Such scanning is performed up to point E. When the primary electron beam is applied to the point A shown in FIG. 6, the voltage applied to the X-axis deflection electrode is the voltage indicated by V 1 in FIG. It is the voltage indicated by 2 . When the primary electron beam is applied to the point A shown in FIG. 6, the voltage applied to the Y-axis deflection electrode is the voltage indicated by V 3 in FIG. It is the voltage indicated by 4 . The time for which the primary electron beam is irradiated from point A to point E shown in FIG. 6 is t 1 shown in FIG. As shown in the voltage waveforms of FIGS. 7 and 8, the voltage waveform is continuously repeated with time t 1 as one cycle. Therefore, it can be seen that the primary electron beam is continuously irradiated by repeating points A to E in FIG.

【0004】[0004]

【発明が解決しようとする課題】従来の2次電子顕微鏡
においては、図7及び図8に示されたような偏向電圧に
よって1次電子ビームを偏向していたため、被観察物に
照射される1次電子ビーム電流が図9に示すようにな
り、たえず被観察物の表面に電子ビームが照射されてい
る。そのため、被観察物表面の帯電が顕著となる。帯電
前の1次電子ビームの照射位置を図10に、帯電後の照
射位置を図11に示す。図11に斜線で示された部分は
1次電子ビームによる帯電を示している。帯電の程度は
被観察物上への1次電子ビームの照射電流量に比例して
大きくなる。従って、図10,図11に示したように、
1次電子ビームの被観察物上への照射位置が帯電前と帯
電後で大きく変わるという問題点があった。
In the conventional secondary electron microscope, since the primary electron beam is deflected by the deflection voltage as shown in FIGS. 7 and 8, the object to be observed is irradiated with 1 The next electron beam current is as shown in FIG. 9, and the surface of the object to be observed is constantly irradiated with the electron beam. Therefore, the surface of the object to be observed is significantly charged. The irradiation position of the primary electron beam before charging is shown in FIG. 10, and the irradiation position after charging is shown in FIG. The hatched portion in FIG. 11 indicates charging by the primary electron beam. The degree of charging increases in proportion to the irradiation current amount of the primary electron beam onto the object to be observed. Therefore, as shown in FIG. 10 and FIG.
There has been a problem that the irradiation position of the primary electron beam on the object to be observed changes greatly before and after charging.

【0005】この発明は、上記のような問題点を解消す
るためになされたもので、被観察物表面の帯電を抑制
し、1次電子ビームの位置が変化しない2次電子顕微鏡
を得ることを目的としている。
The present invention has been made to solve the above problems, and it is an object of the present invention to obtain a secondary electron microscope in which the surface of the object to be observed is suppressed from being charged and the position of the primary electron beam does not change. Has a purpose.

【0006】[0006]

【課題を解決するための手段】この発明に係る2次電子
顕微鏡は、基本的には従来の2次電子顕微鏡と同様な構
成であるが、1次電子ビームが被観察物に照射される前
に、1次電子ビームを遮断できる機構を持たせ、1次電
子ビームが連続的に被観察物に照射されることを防ぎ、
断続的に照射できるようにする。
The secondary electron microscope according to the present invention has basically the same structure as the conventional secondary electron microscope, but before the primary electron beam is applied to the object to be observed. Has a mechanism for blocking the primary electron beam to prevent the primary electron beam from continuously irradiating the object to be observed,
Allow intermittent irradiation.

【0007】[0007]

【作用】この発明における2次電子顕微鏡においては、
1次電子ビームを断続的に遮断することにより、1次電
子ビームが連続的に被観察物に照射されることを防いで
いるため、1次電子ビームによる被観察物表面の帯電が
抑制され、1次電子ビームの位置が変化しないようにな
っている。
In the secondary electron microscope according to the present invention,
By interrupting the primary electron beam intermittently, it is possible to prevent the primary electron beam from continuously irradiating the object to be observed, so that the surface of the object to be observed is prevented from being charged by the primary electron beam. The position of the primary electron beam does not change.

【0008】[0008]

【実施例】以下、この発明の一実施例を図について説明
する。図1はこの発明の一実施例による2次電子顕微鏡
の基本構成を示したものである。図1において、図5と
同一符号は同一のものを示す。14は1次電子ビームの
遮断電極、15は遮断電圧発生器である。図2は遮断電
極に印加される遮断電圧の波形を示したものである。図
3は本実施例の2次電子顕微鏡による2次電子像観察時
に被観察物に照射される1次電子ビームの照射電流を示
したものである。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the basic structure of a secondary electron microscope according to an embodiment of the present invention. In FIG. 1, the same reference numerals as those in FIG. 5 indicate the same parts. Reference numeral 14 is a blocking electrode for the primary electron beam, and 15 is a blocking voltage generator. FIG. 2 shows a waveform of the cutoff voltage applied to the cutoff electrode. FIG. 3 shows the irradiation current of the primary electron beam with which the object to be observed is irradiated when the secondary electron image is observed by the secondary electron microscope of this embodiment.

【0009】次にその遮断電極による1次電子ビームの
遮断の仕方について説明する。遮断電極には図2に示し
たような電圧波形が印加される。電圧VSは1次電子ビ
ームを大きく偏向できる電圧で、1次電子ビームが被観
察物に照射されない電圧に設定する。図2の電圧波形か
ら時刻0からt1 までは電圧が0のため、1次電子ビー
ムは遮断されることなく被観察物に照射される。また、
時刻t1 からt2 までは遮断電圧VSが遮断電極に印加
されているため、1次電子ビームはその電界のため大き
く偏向され、被観察物には照射されない。このため、被
観察物に照射される1次電子ビームの照射電流は図3に
示されたようになる。図3に示されたように、1次電子
ビームは被観察物に連続的に照射されず、断続的に照射
されるので、被観察物表面の帯電が抑制される。従っ
て、この2次電子顕微鏡では、1次電子ビームが連続的
に被観察物に照射されることを防いでいるため、1次電
子ビームによる被観察物表面の帯電が抑制され、1次電
子ビームの位置を変化しないようにできる。
Next, a method of blocking the primary electron beam by the blocking electrode will be described. A voltage waveform as shown in FIG. 2 is applied to the cutoff electrode. The voltage VS is a voltage that can largely deflect the primary electron beam, and is set to a voltage at which the observation target object is not irradiated with the primary electron beam. Since the voltage is 0 from time 0 to t 1 from the voltage waveform of FIG. 2, the primary electron beam is irradiated to the observed object without being blocked. Also,
From time t 1 to t 2 , the cutoff voltage VS is applied to the cutoff electrode, so that the primary electron beam is largely deflected by the electric field and is not irradiated on the observed object. Therefore, the irradiation current of the primary electron beam with which the object to be observed is irradiated is as shown in FIG. As shown in FIG. 3, the primary electron beam is not continuously applied to the object to be observed but is intermittently irradiated, so that the charging of the surface of the object to be observed is suppressed. Therefore, in this secondary electron microscope, the primary electron beam is prevented from being continuously irradiated to the object to be observed, so that the surface of the object to be observed is prevented from being charged by the primary electron beam. The position of can be fixed.

【0010】[0010]

【発明の効果】以上のように、この発明に係る2次電子
顕微鏡によれば、1次電子ビームが被観察物に断続的に
照射されるようにしたので、被観察物表面の帯電が抑制
され、1次電子ビームの被観察物への照射位置を変化し
ないようにできる。
As described above, according to the secondary electron microscope of the present invention, the primary electron beam is intermittently irradiated to the object to be observed, so that the surface of the object to be observed is prevented from being charged. Therefore, the irradiation position of the primary electron beam on the object to be observed can be kept unchanged.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の一実施例による2次電子顕微鏡の基
本構成を示した図である。
FIG. 1 is a diagram showing a basic configuration of a secondary electron microscope according to an embodiment of the present invention.

【図2】遮断電極に印加される遮断電圧の波形を示した
図である。
FIG. 2 is a diagram showing a waveform of a cutoff voltage applied to a cutoff electrode.

【図3】2次電子顕微鏡による2次電子像観察時に被観
察物に照射される1次電子ビームの照射電流を示した図
である。
FIG. 3 is a diagram showing an irradiation current of a primary electron beam with which an object to be observed is irradiated when a secondary electron image is observed with a secondary electron microscope.

【図4】従来の2次電子顕微鏡の基本構成を示した図で
ある。
FIG. 4 is a diagram showing a basic configuration of a conventional secondary electron microscope.

【図5】従来の2次電子顕微鏡の基本構成を示した図で
ある。
FIG. 5 is a diagram showing a basic configuration of a conventional secondary electron microscope.

【図6】2次電子像観察における被観察物への1次電子
ビームの照射方法について示した図である。
FIG. 6 is a diagram showing a method of irradiating an observation object with a primary electron beam in observing a secondary electron image.

【図7】X軸偏向電極に印加されるX軸偏向電圧の電圧
波形を示した図である。
FIG. 7 is a diagram showing a voltage waveform of an X-axis deflection voltage applied to an X-axis deflection electrode.

【図8】Y軸偏向電極に印加されるY軸偏向電圧の電圧
波形を示した図である。
FIG. 8 is a diagram showing a voltage waveform of a Y-axis deflection voltage applied to a Y-axis deflection electrode.

【図9】被観察物の観察領域に照射される1次電子ビー
ムの照射電流と時間の関係を示した図である。
FIG. 9 is a diagram showing a relationship between an irradiation current of a primary electron beam with which an observation region of an observation object is irradiated and time.

【図10】被観察物表面が帯電前の1次電子ビームの照
射位置を示した図である。
FIG. 10 is a diagram showing the irradiation position of the primary electron beam before the surface of the object to be observed is charged.

【図11】被観察物表面が帯電後の1次電子ビームの照
射位置を示した図である。
FIG. 11 is a diagram showing the irradiation position of the primary electron beam after the surface of the object to be observed is charged.

【符号の説明】[Explanation of symbols]

1 被観察物 2 電子ビーム源 3 電子ビームのX軸偏向電極 4 電子ビームのY軸偏向電極 5 X軸偏向電圧発生器 6 Y軸偏向電圧発生器 7 1次電子ビーム 8 2次電子 9 2次電子検出器 10 2次電子検出信号増幅器 11 2次電子像観察用モニタ 12 被観察物上に形成される1次電子ビームの軌跡 13 1次電子ビームが照射される領域 14 遮断電極 15 遮断電圧発生器 DESCRIPTION OF SYMBOLS 1 Observed object 2 Electron beam source 3 Electron beam X-axis deflection electrode 4 Electron beam Y-axis deflection electrode 5 X-axis deflection voltage generator 6 Y-axis deflection voltage generator 7 Primary electron beam 8 Secondary electron 9 Secondary Electron detector 10 Secondary electron detection signal amplifier 11 Secondary electron image observation monitor 12 Trajectory of primary electron beam formed on an object to be observed 13 Area irradiated with primary electron beam 14 Breaking electrode 15 Breaking voltage generation vessel

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 被観察物に1次電子ビームを照射し被観
察物から発生する2次電子像を観察する2次電子顕微鏡
において、 被観察物に照射すべき1次電子ビームを断続的に遮断す
る手段を備え、 被観察物の帯電を抑制できることを特徴とする2次電子
顕微鏡。
1. A secondary electron microscope for observing a secondary electron image generated from an object to be observed by irradiating the object to be observed with a primary electron beam, wherein the primary electron beam to be irradiated to the object to be observed is intermittently supplied. A secondary electron microscope having a means for blocking and capable of suppressing the charging of the object to be observed.
JP3253196A 1991-09-02 1991-09-02 Secondary electron microscope Pending JPH0562637A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3253196A JPH0562637A (en) 1991-09-02 1991-09-02 Secondary electron microscope

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3253196A JPH0562637A (en) 1991-09-02 1991-09-02 Secondary electron microscope

Publications (1)

Publication Number Publication Date
JPH0562637A true JPH0562637A (en) 1993-03-12

Family

ID=17247894

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3253196A Pending JPH0562637A (en) 1991-09-02 1991-09-02 Secondary electron microscope

Country Status (1)

Country Link
JP (1) JPH0562637A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10269983A (en) * 1997-03-24 1998-10-09 Toyota Gakuen Scanning proton microscope

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10269983A (en) * 1997-03-24 1998-10-09 Toyota Gakuen Scanning proton microscope

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