JP2009145050A - Sample shielding mechanism of sample cross section making device - Google Patents
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Abstract
Description
本発明は試料断面作製装置の試料遮蔽機構に関し、更に詳しくは試料の温度上昇を抑制することができるようにした試料断面作製装置の試料遮蔽機構に関する。 The present invention relates to a sample shielding mechanism of a sample cross-section preparation apparatus, and more particularly to a sample shielding mechanism of a sample cross-section preparation apparatus capable of suppressing a temperature rise of a sample.
試料の断面図を撮影するために、試料の断面をエッチング（ミリング）により削るＣＰ装置（クロスセクション・ポリシャー：イオンによる試料断面作製装置）が知られている。この装置は、遮蔽材を試料の上部に設け、エッチング時に遮蔽材が試料の所定の領域を遮蔽し、試料のエッチング部以外の領域がイオンビームの照射を受けることを防いでいる。 In order to photograph a cross-sectional view of a sample, a CP apparatus (cross-section polisher: sample cross-section preparation apparatus using ions) that cuts a cross section of a sample by etching (milling) is known. In this apparatus, a shielding material is provided on the upper part of the sample, and the shielding material shields a predetermined region of the sample during etching, and the region other than the etched portion of the sample is prevented from being irradiated with the ion beam.
従来のこの種装置としては、真空チャンバ内に配置され、試料にイオンビームを照射するためのイオンビーム照射手段と、前記真空チャンバ内に配置され、前記試料を保持する試料ホルダとを備えたイオンビーム−ミリング試料作製装置であって、前記試料ホルダは、前記イオンビーム照射手段からのイオンビームが進入するイオンビーム進入孔を有している技術が知られている（例えば特許文献１参照）。 As this type of conventional apparatus, an ion beam irradiation means for irradiating a sample with an ion beam and an ion beam irradiation means arranged in the vacuum chamber and holding a sample is provided in the vacuum chamber. A beam-milling sample preparation apparatus is known in which the sample holder has an ion beam entrance hole into which an ion beam from the ion beam irradiation means enters (see, for example, Patent Document 1).
また、光学顕微鏡により遮蔽材の位置調整を行ない、この位置調整が行われた試料の所定の位置にイオンビームが正確に照射されるようにした技術が知られている（例えば特許文献２参照）。 Further, a technique is known in which the position of a shielding material is adjusted with an optical microscope, and an ion beam is accurately irradiated to a predetermined position of the sample for which the position adjustment has been performed (see, for example, Patent Document 2). .
また、イオンビームマスク用部材が標本の表面に固定され、イオンビームにより平削り加工され、この平削り加工された標本の状態を観測するための光学顕微鏡が含まれたシステムが知られている（例えば特許文献３参照）。
前述した試料断面作製装置（ＣＰ）は、試料に遮蔽材を密着させてセットして、試料と遮蔽材に直接イオンビームが照射される。試料を冷却するためには、試料と、試料に密着した遮蔽材を冷却する必要があるが、イオンビームが照射される位置には冷却材（冷却伝導材）は設置できず、試料加工部付近（試料密着遮蔽材部分）の温度が上がる。この結果、以下のような問題が発生する。
１）試料加工位置はイオンビーム下遮蔽材部分と接している事から遮蔽板輻射熱で試料上が高温になる。
２）遮蔽材冷却はイオンビーム照射範囲から外れた箇所に接続しなければならない。
３）試料自体もイオンビーム照射範囲から外れた箇所でないと冷却できない。
４）特に熱伝導の悪い試料の場合、３）の場合よりも効果的に冷却ができない。
このように、従来の試料遮蔽方法の場合、熱に弱い試料、例えばＰＥＴ又はプラスチックの場合、熱により試料が破損し、試料の作製が困難である。
In the sample cross-section preparation apparatus (CP) described above, a shielding material is set in close contact with the sample, and the sample and the shielding material are directly irradiated with an ion beam. In order to cool the sample, it is necessary to cool the sample and the shielding material that is in close contact with the sample. However, the coolant (cooling conduction material) cannot be installed at the position where the ion beam is irradiated, and the vicinity of the sample processing part. The temperature of the (sample contact shielding material part) rises. As a result, the following problems occur.
1) Since the sample processing position is in contact with the shielding material portion under the ion beam, the surface of the sample becomes high due to the radiant heat of the shielding plate.
2) Shielding material cooling must be connected to a location outside the ion beam irradiation range.
3) The sample itself cannot be cooled unless it is outside the ion beam irradiation range.
4) Especially in the case of a sample with poor heat conduction, cooling cannot be performed more effectively than in the case of 3).
As described above, in the case of a conventional sample shielding method, in the case of a sample that is vulnerable to heat, for example, PET or plastic, the sample is damaged by heat and it is difficult to prepare the sample.
本発明はこのような課題に鑑みてなされたものであって、熱に弱い試料でも正確な試料断面を作製することができる試料断面作製装置の試料遮蔽機構を提供することを目的としている。 The present invention has been made in view of such problems, and an object of the present invention is to provide a sample shielding mechanism of a sample cross-section preparation apparatus that can produce an accurate sample cross-section even with a heat-sensitive sample.
（１）請求項１記載の発明は、イオンビームを用いて試料に断面を形成する試料断面作製装置に用いる試料遮蔽機構であって、イオンビームを遮蔽する第１の遮蔽手段と、該第１の遮蔽手段と密着され、その下部面に試料が接着される第２の遮蔽手段を設け、前記第１の遮蔽手段と第２の遮蔽手段との間に熱を遮断するための熱遮断手段を設けることを特徴とする。
（２）請求項２記載の発明は、前記熱遮断手段は、断熱材又は気体又は真空の層であることを特徴とする。
（３）請求項３記載の発明は、前記第２の遮蔽手段に冷却伝導用編組線を取り付けたことを特徴とする。
(1) The invention described in claim 1 is a sample shielding mechanism used in a sample section preparation apparatus for forming a section on a sample using an ion beam, the first shielding means for shielding the ion beam, and the first shielding means. A second shielding means for adhering a sample to the lower surface of the shielding means, and a heat shielding means for shielding heat between the first shielding means and the second shielding means. It is characterized by providing.
(2) The invention according to claim 2 is characterized in that the heat blocking means is a heat insulating material or a gas or vacuum layer.
(3) The invention according to claim 3 is characterized in that a braided wire for cooling conduction is attached to the second shielding means.
（１）請求項１記載の発明によれば、第１の遮蔽手段と第２の遮蔽手段との間に熱を遮断するための熱遮断手段を設けることにより、第１の遮蔽手段の熱が試料に伝達されることを防止することができ、熱に弱い試料でも正確な試料断面を作製することができる。
（２）請求項２記載の発明によれば、前記熱遮断手段として断熱材又は空気又は真空の層を設けることで、第１の遮蔽手段からの熱が試料に伝達されることを防止することができる。
（３）請求項３記載の発明によれば、前記第２の遮蔽手段に冷却伝導用編組線を取り付けることにより、試料を効果的に冷却することができる。
(1) According to the invention described in claim 1, the heat of the first shielding means is generated by providing the heat shielding means for shielding heat between the first shielding means and the second shielding means. Transmission to the sample can be prevented, and an accurate sample cross section can be produced even with a sample that is weak against heat.
(2) According to the invention described in claim 2, by providing a heat insulating material or an air or vacuum layer as the heat blocking means, it is possible to prevent heat from the first shielding means from being transmitted to the sample. Can do.
(3) According to the invention described in claim 3, the sample can be effectively cooled by attaching the braided wire for cooling conduction to the second shielding means.
以下、図面を参照して本発明の実施の形態を詳細に説明する。図１は本発明の一実施の形態を示す構成図で、イオンビームを用いて試料に断面を形成する試料断面作製装置（ＣＰ）に用いる試料遮蔽機構を示している。（ａ）は側面図、（ｂ）は斜め上方から観た透過図である。図において、１は試料、ＩＢは該試料１に照射されるイオンビームである。該イオンビームＩＢは、図示しないイオン銃から照射されるようになっている。２は遮蔽材を保持する遮蔽材保持部である。試料１において、熱に弱い試料としては、例えばＰＥＴやプラスチックが用いられる。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of the present invention, and shows a sample shielding mechanism used in a sample cross section preparation apparatus (CP) that forms a cross section in a sample using an ion beam. (A) is a side view, (b) is a transparent view seen from diagonally above. In the figure, 1 is a sample, and IB is an ion beam applied to the sample 1. The ion beam IB is irradiated from an ion gun (not shown). Reference numeral 2 denotes a shielding material holding portion for holding the shielding material. In the sample 1, as a sample that is weak against heat, for example, PET or plastic is used.
３はイオンビームＩＢを遮蔽する第１の遮蔽材、４は該第１の遮蔽材３と接着され、その下部面に試料１が密着される第２の遮蔽材である。遮蔽材３はイオンビームＩＢを遮蔽するために用いられ、遮蔽材４は試料１を冷却するために用いられる。５は遮蔽材３と遮蔽材４との間に設けられた熱を遮断するための熱遮断部である。該熱遮断部５としては、例えば断熱材、気体の層、又は真空の層等が用いられる。気体としては、例えば空気、窒素ガス等が用いられ、断熱材としては、例えばウレタンやセルロース等が用いられる。遮蔽材としては、例えば表面がニッケル・リンで覆われた金属等が用いられる。遮蔽材保持部２は、遮蔽材３と４とを保持することができるようになっている。 3 is a first shielding material that shields the ion beam IB, 4 is a second shielding material that is bonded to the first shielding material 3 and the sample 1 is in close contact with the lower surface thereof. The shielding material 3 is used for shielding the ion beam IB, and the shielding material 4 is used for cooling the sample 1. Reference numeral 5 denotes a heat blocking portion for blocking heat provided between the shielding material 3 and the shielding material 4. As the heat shield 5, for example, a heat insulating material, a gas layer, a vacuum layer, or the like is used. As the gas, for example, air, nitrogen gas or the like is used, and as the heat insulating material, for example, urethane or cellulose is used. As the shielding material, for example, a metal whose surface is covered with nickel / phosphorus is used. The shielding material holding part 2 can hold the shielding materials 3 and 4.
６は試料１を支持する試料支持部材である。７は遮蔽材４中にその先端が埋め込まれた冷却伝導用編組線である。該冷却伝導用編組線７としては、熱伝導率のよい材料、例えば銅等が用いられる。この冷却伝導用編組線７の他方の端は、例えば液体窒素等で冷却されている冷却部（図示せず）に接続されている。このように構成された装置の動作を説明すれば、以下の通りである。 Reference numeral 6 denotes a sample support member that supports the sample 1. Reference numeral 7 denotes a braided wire for cooling conduction, the tip of which is embedded in the shielding material 4. As the cooling conduction braided wire 7, a material having good thermal conductivity, such as copper, is used. The other end of the braided wire 7 for cooling conduction is connected to a cooling unit (not shown) cooled by, for example, liquid nitrogen. The operation of the apparatus configured as described above will be described as follows.
本発明では、遮蔽材３と遮蔽材４との間に熱遮断部５が設けられている。試料１にイオンビームＩＢが照射されてエッチングが行われている時、遮蔽材３にはイオンビームＩＢが照射されるので、該遮蔽材３は発熱して温度が上昇する。熱遮断部５は、この温度上昇により遮蔽材４に熱が伝達されるのを防ぐことができる。従って、この実施の形態によれば、第１の遮蔽手段３と第２の遮蔽手段４との間に熱を遮断するための熱遮断手段を設けることにより、第１の遮蔽手段の熱が試料に伝達されることを防止することができ、熱に弱い試料でも正確な試料断面を作製することができる。 In the present invention, the heat blocking part 5 is provided between the shielding material 3 and the shielding material 4. When the sample 1 is irradiated with the ion beam IB and etching is performed, the shielding material 3 is irradiated with the ion beam IB, so that the shielding material 3 generates heat and the temperature rises. The heat blocking part 5 can prevent heat from being transferred to the shielding material 4 due to this temperature rise. Therefore, according to this embodiment, the heat shielding means for shielding heat is provided between the first shielding means 3 and the second shielding means 4, so that the heat of the first shielding means is changed to the sample. Therefore, an accurate sample cross section can be produced even with a sample that is weak against heat.
実際には、遮蔽材３を介して遮蔽材４にも熱が少し伝達され、試料１は暖められることになる。そこで、冷却伝導用編組線７により、遮蔽材４を冷却することにより、遮蔽材４に伝わる温度上昇を抑制し、試料の温度上昇を抑えることができる。 Actually, a little heat is transmitted to the shielding material 4 through the shielding material 3, and the sample 1 is warmed. Therefore, by cooling the shielding material 4 with the cooling conduction braided wire 7, the temperature rise transmitted to the shielding material 4 can be suppressed, and the temperature rise of the sample can be suppressed.
以上、説明したように、本実施の形態によれば、前記熱遮断部５として断熱材又は気体又は真空の層を設けることで、第１の遮蔽手段からの熱が試料に伝達されることを防止することができる。また、本実施の形態によれば、前記第２の遮蔽手段に冷却伝導用編組線を取り付けることにより、試料を効果的に冷却することができる。 As described above, according to the present embodiment, by providing a heat insulating material or a gas or vacuum layer as the heat blocking portion 5, heat from the first shielding means is transmitted to the sample. Can be prevented. Moreover, according to this Embodiment, a sample can be cooled effectively by attaching the braided wire for cooling conduction to the said 2nd shielding means.
上述の実施の形態では、遮蔽材４を冷却するために冷却伝導用編組線を用いた場合を例にとった。しかしながら、本発明はこれに限るものではなく、他の冷却手段を用いることができる。例えば、遮蔽材４にベルチエ素子を取り付け、このベルチエ素子に電流を流して、遮蔽材４を直接冷やすようにすることも可能である。 In the above-described embodiment, the case where the braided wire for cooling conduction is used to cool the shielding material 4 is taken as an example. However, the present invention is not limited to this, and other cooling means can be used. For example, it is also possible to attach a Berttier element to the shielding material 4 and to directly cool the shielding material 4 by passing an electric current through the Berthier element.
１ 試料
２ 遮蔽材保持部
３ 遮蔽材
４ 遮蔽材
５ 熱遮断部
６ 試料支持部材
７ 冷却伝導用編組線
DESCRIPTION OF SYMBOLS 1 Sample 2 Shielding material holding part 3 Shielding material 4 Shielding material 5 Heat shielding part 6 Sample support member 7 Braided wire for cooling conduction
Claims (3)
イオンビームを遮蔽する第１の遮蔽手段と、
該第１の遮蔽手段と接着され、その下部面に試料が密着される第２の遮蔽手段を設け、
前記第１の遮蔽手段と第２の遮蔽手段との間に熱を遮断するための熱遮断手段を設けることを特徴とする試料断面作製装置の試料遮蔽機構。 A sample shielding mechanism used in a sample cross-section preparation apparatus that forms a cross-section in a sample using an ion beam,
A first shielding means for shielding the ion beam;
A second shielding means that is adhered to the first shielding means and in which the sample is in close contact with the lower surface;
A sample shielding mechanism for a sample cross-section preparation apparatus, wherein a heat shielding means for shielding heat is provided between the first shielding means and the second shielding means.
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| CN105264632A (en) * | 2013-06-10 | 2016-01-20 | 株式会社日立高新技术 | Ion milling device |
| WO2014199737A1 (en) * | 2013-06-10 | 2014-12-18 | 株式会社 日立ハイテクノロジーズ | Ion milling device |
| JP2016186449A (en) * | 2015-03-27 | 2016-10-27 | 京セラドキュメントソリューションズ株式会社 | Cross-sectional sample creation device and cross-sectional sample creation method |
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