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CN1089478C - Cathode Structure body and method of coating electronics radiative body - Google Patents

Cathode Structure body and method of coating electronics radiative body Download PDF

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CN1089478C
CN1089478C CN96120538A CN96120538A CN1089478C CN 1089478 C CN1089478 C CN 1089478C CN 96120538 A CN96120538 A CN 96120538A CN 96120538 A CN96120538 A CN 96120538A CN 1089478 C CN1089478 C CN 1089478C
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CN1173036A (en
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李庆相
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Miller Lighting (korea) Co Ltd
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LG Electronics Inc
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment

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Abstract

本发明之目的在于，将电子发射物质的涂布密度提高约2倍以上。为达此目的，采用在气体金属上表面上，在形成电子发射体时，多次交替地涂布电子发射物质和活性化金属的方法，作成多段积层式以构成电子发射体。在其内插设有阴极加热用的灯丝(104)的圆筒形阴极附属件(103)上段，设置为提供电子发射体(107)的气体金属(102)，在上述气体金属(102)上表面上设置多段涂布活性化金属(105)和电子放射物质的电子发射体(107)。

Figure 96120538

The object of the present invention is to increase the coating density of the electron emission material by about 2 times or more. To achieve this purpose, a method of alternately coating electron-emitting materials and active metals on the upper surface of the gas metal when forming electron emitters is used to form a multi-stage laminate to form an electron emitter. The upper section of the cylindrical cathode attachment (103) with the filament (104) for cathode heating inserted therein is set as the gas metal (102) providing the electron emitter (107), on the gas metal (102) Electron emitters (107) coated with active metals (105) and electron emitting substances in multiple stages are arranged on the surface.

Figure 96120538

Description

阴极构件及其制造方法Cathode component and manufacturing method thereof

本发明涉及阴极构件及其制造方法，特别涉及通过改变涂覆在圆筒形阴极附属件上端的金属层上表面之上的电子发射体的结构，来提高阴极电流密度、延长电子发射寿命的阴极构件。The present invention relates to a cathode component and a manufacturing method thereof, in particular to a cathode which improves the current density of the cathode and prolongs the lifetime of electron emission by changing the structure of the electron emitter coated on the upper surface of the metal layer on the upper end of the cylindrical cathode accessory member.

常规的阴极射线管用的阴极结构，如图1所示，包括在其内部设有阴极加热用的灯丝4的圆筒形阴极附属件3，在其上部形成含有微量活性化金属(例如Mg，Si)的镍(Ni)合金的金属层2，以及在上述金属层2的上表面上，由以氧化钡(BaO)为主要成份，并含有氧化锶(SrO)、氧化钙(CaO)的电子发射物质构成电子发射体1。The cathode structure that conventional cathode ray tube is used, as shown in Figure 1, comprises the cylindrical cathode accessory part 3 that is provided with the filament 4 that cathode heating is used in it, forms on its upper part and contains trace active metal (such as Mg, Si). ) metal layer 2 of nickel (Ni) alloy, and on the upper surface of the above metal layer 2, the electron emission is mainly composed of barium oxide (BaO) and contains strontium oxide (SrO) and calcium oxide (CaO). The substance constitutes the electron emitter 1 .

图中未说明的标号5表示高阻中间层。Reference numeral 5 not illustrated in the figure denotes a high-resistance intermediate layer.

在阴极射线管中的阴极，由于插设在阴极附属件3内部的阴极加热用的灯丝4的发热作用，使金属层2上表面上的电子发射体生成电子。In the cathode in the cathode ray tube, the electron emitter on the upper surface of the metal layer 2 generates electrons due to the heat generation of the cathode heating filament 4 inserted inside the cathode attachment 3 .

而且，阴极电流密度就单位电子发射体表面面积的阴极电流而言，一般位于电子发射中心的电流密度则意味着电子束电流密度。Moreover, the cathode current density refers to the cathode current per unit surface area of the electron emitter, and the current density generally located at the electron emission center means the electron beam current density.

另外，电子发射寿命是指在正常工作条件下的阴极电流与初始阴极电流相比，劣化到其初始值的40～50％的时间。作为与电子发射寿命相关的主要因素，由于活性化金属的不足而使自由钡不足，随着电子发射物质的蒸发而使自由钡不足，在电子发射体1与金属层2之间就有高阻的中间层5生成。In addition, the electron emission lifetime refers to the time during which the cathode current under normal operating conditions deteriorates to 40 to 50% of its initial value compared to the initial cathode current. As a main factor related to electron emission lifetime, free barium is insufficient due to insufficient activation metal, and free barium is insufficient due to evaporation of electron emission material, and there is high resistance between electron emitter 1 and metal layer 2 The intermediate layer 5 is generated.

常规的阴极射线管用的阴极构件的电子生成机理如下： The electron generation mechanism of a cathode member for a conventional cathode ray tube is as follows:

在常规的阴极射线管用的阴极构件中，电子生成反应是在电子发射体1的电子发射物质与金属层2中的活性化金属之间发生的，因此，在电子发射体1与金属层2之间就会形成高阻的氧化物层的中间层5。当电子从阴极生成放出时，由于高阻中间层的存在会产生大量的热，从而损伤了电子发射体1。另一方面，其阻断了电子发射体1中的电子发射物质与金属层2中的活性化金属间发生接触反应，导致电子发射性能的急剧劣化，从而急剧地缩短了电子发射寿命。In a conventional cathode member for a cathode ray tube, an electron generation reaction occurs between the electron emission material of the electron emitter 1 and the active metal in the metal layer 2, and therefore, between the electron emitter 1 and the metal layer 2 An intermediate layer 5 of a high-resistance oxide layer is formed between them. When electrons are generated and released from the cathode, a large amount of heat is generated due to the existence of the high-resistance interlayer, thereby damaging the electron emitter 1 . On the other hand, it blocks the contact reaction between the electron emission material in the electron emitter 1 and the activated metal in the metal layer 2, resulting in a sharp deterioration of the electron emission performance, thereby shortening the electron emission lifetime sharply.

在金属层2上表面上形成这种电子发射体1的方法是采取利用了洁净空气压的空气喷射涂覆方法，涂覆密度约0.8～1.1g/cm3。The method of forming this electron emitter 1 on the upper surface of the metal layer 2 is an air spray coating method using clean air pressure, and the coating density is about 0.8-1.1 g/cm 3 .

这意味着，通过蒸发电子发射物质来提高阴极电流密度和电子发射寿命是有限度的。This means that there is a limit to increasing the cathode current density and electron emission lifetime by evaporating electron emitting materials.

再有，常规的阴极射线管用的阴极构件可工作的峰值阴极电流密度约2.5A/cm2，电子发射寿命约20,000小时。Furthermore, the cathode member for a conventional cathode ray tube can operate at a peak cathode current density of about 2.5 A/cm 2 , and has an electron emission life of about 20,000 hours.

这种常规的阴极射线管虽然主要使用氧化物阴极，但由于最近的阴极射线管的大型化、高辉度化的趋势，需要更高的阴极电流密度，为了提高阴极电流密度，正在开发使用一种配合(dispenser)阴极。但配合阴极的制作工艺过程极为复杂，其价格与氧化物阴极相比高约20倍左右，难以应用于阴极射线管。Although such a conventional cathode ray tube mainly uses an oxide cathode, due to the recent trend of increasing the size and brightness of cathode ray tubes, a higher cathode current density is required. In order to increase the cathode current density, a A dispenser cathode. However, the manufacturing process of the matching cathode is extremely complicated, and its price is about 20 times higher than that of the oxide cathode, which is difficult to apply to the cathode ray tube.

本发明之目的在于，提高电子发射物质的涂覆密度，使常规的氧化物阴极的约2.5A/cm2的阴极电流密度和约20,000小时的电子发射寿命限度提高约2倍以上。The purpose of the present invention is to increase the coating density of electron emission materials, so that the cathode current density of about 2.5 A/cm 2 and the electron emission life limit of about 20,000 hours of conventional oxide cathodes are increased by more than about 2 times.

为实现上述目的，本发明提供了一种阴极构件，包括一个阴极附属件103和设置在所述阴极附属件内用于加热的灯丝104，一金属层102涂覆在所述阴极附属件103的外表面，以及一电子发射体107形成在金属层上表面之上，其特征在于所述电子发射体107由多层构成，该多层由电子发射物质层106和活性化金属层105交替层叠而成。To achieve the above object, the present invention provides a cathode component, including a cathode accessory 103 and a filament 104 arranged in the cathode accessory for heating, a metal layer 102 coated on the cathode accessory 103 The outer surface and an electron emitter 107 are formed on the upper surface of the metal layer. It is characterized in that the electron emitter 107 is composed of multiple layers, and the multilayer is formed by alternately stacking electron emission material layers 106 and active metal layers 105. become.

本发明还提供了用于制造上述阴极构件的制造方法，所述阴极构件包括一个阴极附属件103和设置在所述阴极附属件内用于加热的灯丝104，一金属层102涂覆在所述阴极附属件103的外表面，一电子发射体107形成在金属层107上表面之上，其特征在于在金属层102上表面之上交替地涂覆电子发射物质层106和活性化金属层105以形成所述的电子发射体。The present invention also provides a manufacturing method for manufacturing the above-mentioned cathode component, the cathode component includes a cathode accessory 103 and a filament 104 arranged in the cathode accessory for heating, a metal layer 102 is coated on the On the outer surface of the cathode attachment 103, an electron emitter 107 is formed on the upper surface of the metal layer 107, which is characterized in that the electron emission material layer 106 and the active metal layer 105 are alternately coated on the upper surface of the metal layer 102 to forming the electron emitter.

图1是常规的阴极射线管用的阴极构件的结构图。FIG. 1 is a structural diagram of a cathode member for a conventional cathode ray tube.

图2是本发明的阴极射线管用的阴极构件的结构图。Fig. 2 is a structural diagram of a cathode member for a cathode ray tube of the present invention.

图2是表示本发明的阴极构件的结构图，在其内插设有阴极加热用的灯丝104的圆筒形阴极附属件103的上端，设置有金属层102，在上述金属层102上表面上设置由活性化金属层105和电子放射物质层106层叠形成的电子发射体107。Fig. 2 is the structural diagram showing the cathode member of the present invention, in which the upper end of the cylindrical cathode attachment 103 of the filament 104 for cathode heating is inserted, a metal layer 102 is provided, on the above-mentioned metal layer 102 upper surface An electron emitter 107 formed by laminating the active metal layer 105 and the electron emissive material layer 106 is provided.

而且，上述电子发射物质层106是以氧化钡(BaO)为主要成份并至少含有氧化锶(SrO)、氧化钙(CaO)、氧化钪(Sc2O3)及氧化铝(Al2O3)中之一种的复合氧化物，活性化金属层105，例如，至少包含镁(Mg)、锆(Zr)、锰(Mn)、钨(W)及钍(Th)中之一种作为与氧化钡起反应生成自由钡的金属。Furthermore, the electron emission material layer 106 is mainly composed of barium oxide (BaO) and contains at least strontium oxide (SrO), calcium oxide (CaO), scandium oxide (Sc 2 O 3 ) and aluminum oxide (Al 2 O 3 ). One of the composite oxides, the active metal layer 105, for example, contains at least one of magnesium (Mg), zirconium (Zr), manganese (Mn), tungsten (W) and thorium (Th) as an oxide Barium A metal that reacts to form free barium.

这种在金属层102上表面上涂覆电子发射体107的方法，以多次交替涂覆电子发射物质层106与活性化金属层105的方法最为有效，而采用将电子发射物质层106与活性化金属层105混合后涂覆、喷射等方法，都不能均匀分布。This method of coating the electron emitter 107 on the upper surface of the metal layer 102 is the most effective method of alternately coating the electron emission material layer 106 and the active metal layer 105 multiple times, and adopts the method of coating the electron emission material layer 106 and the active metal layer 105. After the metallization layer 105 is mixed, coating, spraying and other methods cannot be evenly distributed.

另外，在涂覆电子发射体107时，首先在金属层102的上表面上，涂覆电子发射物质层106，在电子发射物质层106表面上再设置活性化金属层105，则使活性化金属层不脱离，可以有效地构成电子发射体107。In addition, when coating the electron emitter 107, first on the upper surface of the metal layer 102, the electron emission material layer 106 is coated, and then the active metal layer 105 is set on the surface of the electron emission material layer 106, so that the active metal The electron emitter 107 can be constituted efficiently without layer detachment.

涂覆电子发射物质层106的方法，虽然可以使用常规的喷射方法，但为了提高电子发射体107的涂覆密度，施加一定压力的印制方法是有效的，当每一层涂覆厚度在20μm以下时，可使活性化金属层105与电子发射物质106间的反应成为可能。这时，以微细粉末涂覆活性化金属的方法，若利用采取干燥空气喷射方式的喷射方法，能使活性化金属分布均匀，提高效果。The method for coating the electron emission material layer 106, although the conventional spraying method can be used, in order to improve the coating density of the electron emitter 107, the printing method of applying a certain pressure is effective, when the coating thickness of each layer is 20 μm In the following cases, the reaction between the active metal layer 105 and the electron emission material 106 can be made possible. At this time, the method of coating the activated metal with fine powder can make the distribution of the activated metal uniform and improve the effect by using the dry air spraying method.

在本发明的阴极射线管用的阴极构件中，在含有镁和硅的镍合金的金属层102上表面上设置由以氧化钡、氧化铝为主要成分的电子发射物质层106和含钨粉末的活性化金属层105构成的电子发射体107，电子生成机理如下：In the cathode member for cathode ray tube of the present invention, on the upper surface of the metal layer 102 of a nickel alloy containing magnesium and silicon, an electron emission material layer 106 mainly composed of barium oxide and aluminum oxide and an active substance containing tungsten powder are provided. The electron emitter 107 that metallization layer 105 is formed, electron generation mechanism is as follows:

①电子发射物质层106和金属层102之间的电子生成机理： ① Electron generation mechanism between the electron emission material layer 106 and the metal layer 102:

②电子发射体107内的电子发射物质层106与活性化金属层105间的电子生成机理：② Electron generation mechanism between the electron emission material layer 106 and the active metal layer 105 in the electron emitter 107:

本发明的阴极射线管用的阴极构件与常规的阴极构件相比生成有大量的自由钡，但电子发射体107内的电子发射物质层106同活性化金属层105间的反应生成物不同于上述电子发射物质层106同金属层102间的反应生成物的中间层，它生成在表面宽大的活性化金属层105表面上，这就防止了电子发射时的发热。相对来讲，象常规那样的电子发射物质与金属层间的中间层生成得也薄些，构不成电子发射劣化的主要原因，所以可以抑制常规的电子发射物质与金属层间的中间层的电子发射变热，抑制电子发射劣化，延长电子发射寿命。The cathode member for a cathode ray tube of the present invention generates a large amount of free barium compared with a conventional cathode member, but the reaction product between the electron emission material layer 106 and the active metal layer 105 in the electron emitter 107 is different from the above-mentioned electron emission material layer 105. The intermediate layer of the reaction product between the emissive material layer 106 and the metal layer 102 is formed on the surface of the active metal layer 105 with a wide surface, which prevents heat generation during electron emission. Relatively speaking, the intermediate layer between the conventional electron emission material and the metal layer is formed thinner, which does not constitute the main cause of electron emission degradation, so the electron emission in the intermediate layer between the conventional electron emission material and the metal layer can be suppressed. Emission heats up, suppresses deterioration of electron emission, and prolongs life of electron emission.

再有，本发明的电子发射体涂覆方法是利用给电子发射物质层106施加压力的印制方法涂覆的，活性化金属层105是利用空气喷射方式涂覆的，因而可以得到含均匀的活性化金属层105的电子发射体107。而且，电子发射物质层106的涂覆密度提高至1.2g/cm2以上，可以抑制阴极工作时电子发射物质层106的蒸发，因而可以提高阴极电流密度，延长发射寿命。In addition, the electron emitter coating method of the present invention is coated by a printing method that applies pressure to the electron emission material layer 106, and the active metal layer 105 is coated by air spraying, so that a uniform coating can be obtained. The electron emitter 107 of the metal layer 105 is activated. Moreover, increasing the coating density of the electron emission material layer 106 to above 1.2 g/cm 2 can suppress the evaporation of the electron emission material layer 106 when the cathode is working, thereby increasing the cathode current density and prolonging the emission life.

以上，如所说明的，若依本发明，可以得到均匀的活性化金属的电子发射体，将电子发射物质的涂覆密度提高至1.2g/cm2以上，可以抑制阴极工作时的电子发射物质的蒸发，增大阴极电流密度并延长电子发射寿命。Above, as explained, according to the present invention, uniform electron emitters of activated metals can be obtained, and the coating density of the electron emission materials can be increased to more than 1.2 g/cm 2 , which can suppress the electron emission materials during cathode operation. The evaporation of the cathode increases the cathode current density and prolongs the lifetime of electron emission.

Claims (8)

1. A cathode structure comprising a cathode attachment (103) and a filament (104) provided in the cathode attachment for heating, a metal layer (102) coated on an outer surface of the cathode attachment (103), and an electron emitter (107) formed on an upper surface of the metal layer, characterized in that the electron emitter (107) is formed of a plurality of layers formed by alternately laminating an electron emitting material layer (106) and an activated metal layer (105).
2. Cathode structure according to claim 1, characterized in that the electron emitter (107) is formed by two layers (106) of electron-emitting material sandwiching an activated metal layer (105).
3. A cathode structure according to claim 1, characterized in that the activating metal comprises at least one of magnesium, zirconium, manganese, tungsten and thorium.
4. The cathode structure according to claim 1, wherein said electron-emitting material comprises barium oxide as a main component and at least one of strontium oxide, calcium oxide, scandium oxide and aluminum oxide.
5. The cathode structure according to claim 1, wherein each layer of the electron-emitting material is coated to a thickness of 20 μm or less.
6. A method of manufacturing a cathode structure comprising a cathode attachment (103) and a filament (104) for heating provided in the cathode attachment, a metal layer (102) being coated on an outer surface of the cathode attachment (103), an electron emitter (107) being formed on an upper surface of the metal layer, characterized in that an electron emitting material layer (106) and an activated metal layer (105) are alternately coated on the upper surface of the metal layer (102) to form the electron emitter.
7. The method of claim 6, wherein the electron-emitting material layer is applied by printing under a predetermined pressure.
8. The method of claim 6, wherein said activated metal layer is applied by an air spray method.
CN96120538A 1995-12-20 1996-12-10 Cathode Structure body and method of coating electronics radiative body Expired - Fee Related CN1089478C (en)

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Publication number Priority date Publication date Assignee Title
JPH04253137A (en) * 1991-01-25 1992-09-08 Mitsubishi Electric Corp Cathode for electron tube

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US3113236A (en) * 1959-06-23 1963-12-03 Philips Corp Oxide dispenser type cathode
NL113461C (en) * 1961-03-08
JP2758244B2 (en) * 1990-03-07 1998-05-28 三菱電機株式会社 Cathode for electron tube
DE4207220A1 (en) * 1992-03-07 1993-09-09 Philips Patentverwaltung SOLID ELEMENT FOR A THERMIONIC CATHODE

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04253137A (en) * 1991-01-25 1992-09-08 Mitsubishi Electric Corp Cathode for electron tube

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GB2308495B (en) 2000-08-30
KR100195955B1 (en) 1999-06-15
BR9606144A (en) 1998-11-03
MY117904A (en) 2004-08-30
GB9626424D0 (en) 1997-02-05
KR970051633A (en) 1997-07-29
JPH09180622A (en) 1997-07-11
CN1173036A (en) 1998-02-11
GB2308495A (en) 1997-06-25

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