JPH04116347U - focus magnet - Google Patents
focus magnetInfo
- Publication number
- JPH04116347U JPH04116347U JP2861891U JP2861891U JPH04116347U JP H04116347 U JPH04116347 U JP H04116347U JP 2861891 U JP2861891 U JP 2861891U JP 2861891 U JP2861891 U JP 2861891U JP H04116347 U JPH04116347 U JP H04116347U
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- magnet
- cylindrical permanent
- focus
- permanent magnet
- 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.)
- Granted
Links
- 230000005291 magnetic effect Effects 0.000 claims abstract description 30
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- 239000004033 plastic Substances 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 30
- 229910052742 iron Inorganic materials 0.000 abstract description 15
- 230000003068 static effect Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010894 electron beam technology Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 7
- 229910000859 α-Fe Inorganic materials 0.000 description 6
- 229910000828 alnico Inorganic materials 0.000 description 5
- 239000003302 ferromagnetic material Substances 0.000 description 4
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 3
- 239000006247 magnetic powder Substances 0.000 description 3
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000003700 epoxy group Chemical group 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
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
(57)【要約】
【目的】 高い周波数で使用しても鉄損が増大せず効率
のよいフォーカスマグネットを提供する。
【構成】 金属製の円筒状永久磁石１及び２の内周側に
プラスチック製の円筒状永久磁石８及び９を設けて、そ
の内周側にリッツ線からなる中心磁界補正用のダイナミ
ックフォーカスコイル６と、中心磁界補正用のスタティ
ックフォーカスコイル７とを配置する。
【効果】 鉄損の少ないプラスチック製磁石と保磁力の
大きい金属製磁石の特徴が発揮され、高い周波数で使用
しても鉄損が少なく効率がよい。
(57) [Summary] [Purpose] To provide an efficient focusing magnet that does not increase iron loss even when used at high frequencies. [Structure] Plastic cylindrical permanent magnets 8 and 9 are provided on the inner circumferential side of metal cylindrical permanent magnets 1 and 2, and a dynamic focus coil 6 for center magnetic field correction made of a Litz wire is provided on the inner circumferential side. and a static focus coil 7 for center magnetic field correction. [Effect] The characteristics of plastic magnets with low iron loss and metal magnets with high coercive force are exhibited, and even when used at high frequencies, iron loss is low and efficiency is high.
Description
【０００１】0001
本考案は、例えばビデオプロジェクタなどのＣＲＴのネック部周辺に配置され て電子ビームを集束する磁界を発生させるためのフォーカスマグネットに関する ものである。 The present invention is designed to be placed around the neck of a CRT such as a video projector. Concerning a focus magnet for generating a magnetic field to focus an electron beam It is something.
【０００２】0002
従来、ＣＲＴの電子銃より発した電子ビームを蛍光面上に集束させる方法には 、電子ビームに静電界を作用させる電界レンズ方式と、磁界を作用させる磁界レ ンズ方式の２種類がある。さらに磁界レンズ方式には、その磁界発生源により電 磁石方式と永久磁石方式の２種類に分けられるが、電磁石方式は形状が大きくな り、電子ビーム集束用の電流を常時通電する電源が必要なため、現在は永久磁石 方式が主流となっており、ビデオプロジェクタなどの投射型テレビに、解像度が 優れている上記永久磁石を用いた磁界レンズ方式のフォーカスマグネットが用い られている。 Conventionally, the method of focusing the electron beam emitted from a CRT electron gun onto a phosphor screen is as follows: , an electric field lens method that applies an electrostatic field to the electron beam, and a magnetic field lens method that applies a magnetic field to the electron beam. There are two types of lenses. Furthermore, the magnetic field lens method uses a magnetic field source to generate electricity. There are two types: magnet type and permanent magnet type, but electromagnetic type has a larger shape. Currently, permanent magnets are used because a power source is required to constantly supply current for electron beam focusing. This method has become mainstream, and projection televisions such as video projectors have higher resolution. Uses a magnetic field lens type focus magnet using the excellent permanent magnet mentioned above. It is being
【０００３】 特公昭４９−４５７３、４９−４５７４号公報などに示される従来のフォカス マグネットを図２に示す。 図において、円筒状の永久磁石１１及び１２は軸方向に着磁して端面にＮ，Ｓ 磁極が設けられた、焼結形アルニコ又はフェライトあるいはサマリウムコバルト などから構成されている。この永久磁石１１，１２は磁石の偏磁による電子ビー ムへの悪影響を回避するため、図示しないＣＲＴのネック部から離れた外周部に 配置されている。永久磁石１１，１２の中間部に設けられた中空円板状のセンタ ーヨーク１３は軟鉄などの強磁性体で構成されている。永久磁石１１及び１２の 端面に固定された中空円板状のサイドヨーク１４及び１５は軟鉄などの強磁性材 料で構成されている。 永久磁石１１の内周側に設けられた中心磁界補正用のダイナミックフォーカス コイル１６は図示しないＣＲＴの管面周辺部に電子ビームを集束させる補正磁界 を発生するものであり、図示しないダイナミックフォーカス回路から偏向走査に 応じた波形をもつパラボラ電流などが供給されている。 永久磁石１２の内周側に設けられた中心磁界補正用のスタティックフォーカス コイル１７は図示しないＣＲＴの管面中心部に電子ビームを集束させる補正磁界 を発生するものであり、図示しないスタティックフォーカス回路から一定の直流 電流が供給されている。0003 Conventional focus shown in Japanese Patent Publication Nos. 49-4573 and 49-4574, etc. The magnet is shown in Figure 2. In the figure, cylindrical permanent magnets 11 and 12 are magnetized in the axial direction and have N and S on their end faces. Sintered alnico or ferrite or samarium cobalt with magnetic poles It is composed of etc. These permanent magnets 11 and 12 generate electron beams due to the biased magnetism of the magnets. In order to avoid adverse effects on the CRT (not shown), the It is located. A hollow disk-shaped center provided between the permanent magnets 11 and 12 - The yoke 13 is made of a ferromagnetic material such as soft iron. Permanent magnets 11 and 12 The hollow disk-shaped side yokes 14 and 15 fixed to the end faces are made of ferromagnetic material such as soft iron. It consists of a fee. Dynamic focus for center magnetic field correction provided on the inner circumferential side of the permanent magnet 11 The coil 16 is a correction magnetic field that focuses the electron beam on the periphery of the tube surface of the CRT (not shown). is generated, and is used for deflection scanning from a dynamic focus circuit (not shown). A parabolic current with a corresponding waveform is supplied. Static focus for center magnetic field correction provided on the inner circumferential side of the permanent magnet 12 The coil 17 is a correction magnetic field that focuses the electron beam on the center of the tube surface of the CRT (not shown). A constant DC current is generated from a static focus circuit (not shown). Current is being supplied.
【０００４】 このように構成されたフォーカスマグネットに図示しないリード線を介して各 コイル１６，１７に電流を通電すると磁界が発生して、永久磁石１１，１２によ って発生している中心部の磁界を調整（補正）することが可能となり、ＣＲＴの 管面全体に一様に電子ビームを集束することができる。0004 Each focus magnet is connected to the focus magnet configured in this way via a lead wire (not shown). When current is applied to the coils 16 and 17, a magnetic field is generated and the permanent magnets 11 and 12 generate a magnetic field. It is now possible to adjust (correct) the magnetic field at the center of the CRT. The electron beam can be focused uniformly over the entire tube surface.
【０００５】[0005]
最近、ビデオプロジェクタなどの投射型テレビはＨＤＴＶ及びＥＤＴＶなどの 高精細度テレビジョン信号を表示するディスプレイとして注目されており、この 場合、水平走査周波数は３３．７５ＫＨｚあるいは３１．４７ＫＨｚとなり従来 の１５．７３ＫＨｚと比較して２倍以上の周波数となる。 これに対して、上記従来のフォーカスマグネットは、永久磁石１１，１２に焼 結形アルニコ又はフェライト，サマリウムコバルトなどの金属性の永久磁石を使 用しているため、ダイナミックフォーカスコイル１６に流すパラボラ電流の周波 数を２０ＫＨｚ以上にすると永久磁石１１，１２の鉄損が増大して発熱し効率が 低下する。 Recently, projection televisions such as video projectors have become popular, such as HDTV and EDTV. It is attracting attention as a display that displays high-definition television signals, and this In this case, the horizontal scanning frequency is 33.75KHz or 31.47KHz, which is different from the conventional The frequency is more than twice that of the 15.73 KHz. On the other hand, in the conventional focus magnet described above, the permanent magnets 11 and 12 are baked. A permanent magnet made of metal such as crystalline alnico, ferrite, or samarium cobalt is used. Since the frequency of the parabolic current flowing through the dynamic focus coil 16 is If the number is 20KHz or higher, the iron loss of permanent magnets 11 and 12 will increase, generating heat and reducing efficiency. descend.
【０００６】 それ故に、本考案の目的は、ＨＤＴＶ及びＥＤＴＶなどの高い水平走査周波数 で使用しても鉄損が増大せず効率のよいフォーカスマグネットを提供することに ある。[0006] Therefore, the purpose of the present invention is to provide high horizontal scanning frequency such as HDTV and EDTV. To provide an efficient focusing magnet that does not increase iron loss even when used in be.
【０００７】[0007]
従って、上述の目的を達成するために第１の本考案は、軸方向に着磁された金 属製の円筒状永久磁石と、この円筒状永久磁石の両端に装着されたヨークプレー トと、前記円筒状永久磁石の内周に配置された複数の中心磁界補正用のコイルと を備えたフォーカスマグネットにおいて、前記円筒状永久磁石と中心磁界補正用 のコイルとの間に軸方向に着磁されたプラスチック製の円筒状永久磁石を設けた こものである。 第２の本考案は前記中心磁界補正用のコイルの１つをリッツ線で構成したもも である。 Therefore, in order to achieve the above-mentioned object, the first present invention is based on an axially magnetized metal. A cylindrical permanent magnet made of metal and a yoke plate attached to both ends of this cylindrical permanent magnet. and a plurality of center magnetic field correction coils arranged on the inner periphery of the cylindrical permanent magnet. In the focus magnet equipped with the cylindrical permanent magnet and the center magnetic field correction A plastic cylindrical permanent magnet magnetized in the axial direction was installed between the coil and the It's a small thing. The second invention is based on a method in which one of the coils for correcting the central magnetic field is made of a Litz wire. It is.
【０００８】[0008]
この本考案によれば、円筒状永久磁石を金属製とプラスチック製との２つで構 成したため、鉄損の少ないプラスチック磁石と保磁力の強い金属製磁石との特徴 が発揮され、高い水平走査周波数で使用した場合の鉄損が増大する問題を解決し ている。 According to this invention, the cylindrical permanent magnet is made of two materials, one made of metal and one made of plastic. Therefore, the characteristics of plastic magnets with low iron loss and metal magnets with strong coercive force are This solves the problem of increased iron loss when used at high horizontal scanning frequencies. ing.
【０００９】[0009]
次に、本考案の一実施例について図１を参照して説明する。 図１は本考案に係わるフォーカスマグネットの断面図である。図において、金 属製の円筒状の永久磁石１及び２は軸方向に着磁して端面にＮ，Ｓ磁極が設けら れた、焼結形アルニコ又はフェライトあるいはサマリウムコバルトなどから構成 されている。永久磁石１，２の中間部に設けられた中空円板状のセンターヨーク ３は軟鉄などの強磁性体で構成されている。永久磁石１及び２の端面に固定され た中空円板状のサイドヨーク４及び５は軟鉄などの強磁性材料で構成されている 。 永久磁石１の内周側に設けられた中心磁界補正用のダイナミックフォーカス コイル６は図示しないＣＲＴの管面周辺部に電子ビームを集束させる補正磁界を 発生するものであり、図示しないダイナミックフォーカス回路から偏向走査に応 じた波形をもつパラボラ電流などが供給されている。 永久磁石２の内周側に設けられた中心磁界補正用のスタティックフォーカスコ イル７は図示しないＣＲＴの管面中心部に電子ビームを集束させる補正磁界を発 生するものであり、図示しないスタティックフォーカス回路から一定の直流電流 が供給されている。 Next, an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a sectional view of a focus magnet according to the present invention. In the figure, gold Cylindrical permanent magnets 1 and 2 made of metal are axially magnetized and have N and S magnetic poles on their end faces. composed of sintered alnico or ferrite or samarium cobalt. has been done. Hollow disk-shaped center yoke provided in the middle of permanent magnets 1 and 2 3 is made of a ferromagnetic material such as soft iron. Fixed to the end faces of permanent magnets 1 and 2 The hollow disk-shaped side yokes 4 and 5 are made of ferromagnetic material such as soft iron. . Dynamic focus for center magnetic field correction provided on the inner circumferential side of permanent magnet 1 The coil 6 applies a correction magnetic field to focus the electron beam around the tube surface of the CRT (not shown). This is generated in response to deflection scanning from a dynamic focus circuit (not shown). A parabolic current with a similar waveform is supplied. A static focus core for center magnetic field correction provided on the inner circumferential side of the permanent magnet 2. The coil 7 generates a correction magnetic field that focuses the electron beam on the center of the tube surface of the CRT (not shown). A constant DC current is generated from a static focus circuit (not shown). is supplied.
【００１０】 ここまでは従来のフォーカスマグネットと変わりは無いが、金属製の円筒状永 久磁石１，２と各コイル６，７との間に、軸方向に着磁されたプラスチック製の 円筒状永久磁石６，７が設けられている。 すなわち、円筒状永久磁石は金属製の永久磁石１，２とプラスチック製の永久 磁石８，９とで構成されている。 プラスチック製の円筒状永久磁石６，７はアルニコ及びフェライト系、サマリ ウム・コバルトなどの希土類系、ネオジ−鉄−ボロンなどの磁性体粉末を、ポリ アミド、ポリエステル、エポキシなどのプラスチック樹脂からなる結合剤（バイ ンダー）と一緒に添加剤を加えて混練したのち、射出成形又は圧縮成形工程を経 て軸方向に着磁したものである。 但し、磁性体粉末にフェライト系を使用した場合は周囲温度によって特性が変 化するので、温度センサーを含む温度補償回路を、スタティックフォーカスコイ ル７に接続する必要がある。0010 Up to this point, it is no different from a conventional focus magnet, but it is made of a metal cylindrical permanent magnet. Between the permanent magnets 1 and 2 and each coil 6 and 7, there is a plastic magnet magnetized in the axial direction. Cylindrical permanent magnets 6, 7 are provided. In other words, the cylindrical permanent magnet consists of metal permanent magnets 1 and 2 and plastic permanent magnets. It is composed of magnets 8 and 9. Plastic cylindrical permanent magnets 6 and 7 are alnico and ferrite type, summary Rare earth elements such as aluminum and cobalt, and magnetic powders such as neodymium-iron-boron are used in polyimide. Binders made of plastic resins such as amides, polyesters, and epoxies After adding additives and kneading together with the molding powder, it goes through an injection molding or compression molding process. It is magnetized in the axial direction. However, if ferrite-based magnetic powder is used, the characteristics may change depending on the ambient temperature. Since the temperature compensation circuit including the temperature sensor is It is necessary to connect to 7.
【００１１】 このようなプラスチック製の磁石は各材料の配合と着磁を比較的容易に制御で きるため、従来の焼結形アルニコ又はフェライト系磁石と比較し偏磁の少ない永 久磁石を形成することができると共にプラスチック樹脂からなるバインダーによ って磁性体粉末間の絶縁性が高くなり鉄損が減少する。 従って、２０ＫＨｚ以上の高周波数で使用しても鉄損が増大しない。但し、バ インダーが加わった分保磁力が低下し磁界の発生が弱くなるため、この保磁力低 下を金属製の円筒状永久磁石１，２と組み合わせることにより補っている。 また、ダイナミックフォーカスコイル６の巻線は高周波数による表皮効果を低 減するためリッツ線を使用している。[0011] For such plastic magnets, the composition and magnetization of each material can be controlled relatively easily. Because of this, it is a permanent magnet with less biased magnetism compared to conventional sintered alnico or ferrite magnets. It is possible to form a long-lasting magnet, and it can also be used with a binder made of plastic resin. This increases the insulation between the magnetic powders and reduces iron loss. Therefore, iron loss does not increase even when used at a high frequency of 20 KHz or higher. However, The coercive force decreases due to the addition of the inder, and the generation of a magnetic field becomes weaker. This is supplemented by combining the lower part with metal cylindrical permanent magnets 1 and 2. In addition, the winding of the dynamic focus coil 6 reduces the skin effect caused by high frequencies. Litz wire is used to reduce the
【００１２】0012
以上説明したように本考案は、円筒状永久磁石を金属製とプラスチック製との ２つで構成したため、鉄損の少ないプラスチック磁石と保磁力の強い金属製磁石 との特徴が発揮され、ＨＤＴＶ及びＥＤＴＶなどの高い水平走査周波数で使用し た場合でも鉄損が増大することがなくなる効果がある。 As explained above, the present invention combines cylindrical permanent magnets made of metal and plastic. Consists of two parts: a plastic magnet with low iron loss and a metal magnet with strong coercive force. This feature makes it possible to use it at high horizontal scanning frequencies such as HDTV and EDTV. This has the effect of preventing iron loss from increasing even when
【図面の簡単な説明】[Brief explanation of drawings]
【図１】本考案に係わるフォーカスマグネットの断面図
である。FIG. 1 is a sectional view of a focus magnet according to the present invention.
【図２】従来のフォーカスマグネットの断面図である。FIG. 2 is a cross-sectional view of a conventional focus magnet.
１，２，１１，１２ 金属製の円筒状永久磁石
３，１３ センターヨーク
４，５，１４，１５ サイドヨーク
６，１６ 中心磁界補正用のコイル（ダイナミックフォ
ーカスコイル）
７，１７ 中心磁界補正用のコイル（スタティックフォ
ーカスコイル）
８，９ プラスチック製の円筒状永久磁石1, 2, 11, 12 Metal cylindrical permanent magnet 3, 13 Center yoke 4, 5, 14, 15 Side yoke 6, 16 Coil for center magnetic field correction (dynamic focus coil) 7, 17 Coil for center magnetic field correction Coil (static focus coil) 8, 9 Plastic cylindrical permanent magnet
Claims (2)
磁石と、この円筒状永久磁石の両端に固定されたヨーク
プレートと、前記円筒状永久磁石の内周に配置された複
数の中心磁界補正用のコイルとを備えたフォーカスマグ
ネットにおいて、前記円筒状永久磁石と中心磁界補正用
のコイルとの間に軸方向に着磁されたプラスチック製の
円筒状永久磁石を設けたことを特徴とするフォーカスマ
グネット。1. A cylindrical permanent magnet made of metal magnetized in the axial direction, a yoke plate fixed to both ends of the cylindrical permanent magnet, and a plurality of yoke plates arranged on the inner periphery of the cylindrical permanent magnet. A focus magnet including a coil for correcting a central magnetic field, characterized in that a cylindrical permanent magnet made of plastic magnetized in the axial direction is provided between the cylindrical permanent magnet and the coil for correcting a central magnetic field. Focus magnet.
ッツ線で構成されたことを特徴とする請求項１記載のフ
ォーカスマグネット。2. The focus magnet according to claim 1, wherein one of the central magnetic field correction coils is made of a Litz wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2861891U JP2551867Y2 (en) | 1991-03-29 | 1991-03-29 | Focus magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2861891U JP2551867Y2 (en) | 1991-03-29 | 1991-03-29 | Focus magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04116347U true JPH04116347U (en) | 1992-10-16 |
| JP2551867Y2 JP2551867Y2 (en) | 1997-10-27 |
Family
ID=31912674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2861891U Expired - Lifetime JP2551867Y2 (en) | 1991-03-29 | 1991-03-29 | Focus magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2551867Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140049471A (en) * | 2012-10-17 | 2014-04-25 | 가부시키가이샤 리가쿠 | X-ray generating apparatus |
| WO2018107823A1 (en) | 2016-12-14 | 2018-06-21 | Focus-Ebeam Technology (Beijing) Co., Ltd. | Magnetic lens and exciting current control method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101861210B1 (en) | 2010-10-27 | 2018-05-25 | 가부시키가이샤 파람 | Electron lens and the electron beam device |
-
1991
- 1991-03-29 JP JP2861891U patent/JP2551867Y2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140049471A (en) * | 2012-10-17 | 2014-04-25 | 가부시키가이샤 리가쿠 | X-ray generating apparatus |
| WO2018107823A1 (en) | 2016-12-14 | 2018-06-21 | Focus-Ebeam Technology (Beijing) Co., Ltd. | Magnetic lens and exciting current control method |
| EP3357079A4 (en) * | 2016-12-14 | 2018-12-05 | Focus-eBeam Technology (Beijing) Co., Ltd. | Magnetic lens and exciting current control method |
| US10923312B2 (en) | 2016-12-14 | 2021-02-16 | Focus-Ebeam Technology (Beijing) Co., Ltd. | Magnetic lens and exciting current control method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2551867Y2 (en) | 1997-10-27 |
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