EP1147543A1 - Tube neck for cathode-ray tube - Google Patents

Tube neck for cathode-ray tube

Info

Publication number
EP1147543A1
EP1147543A1 EP99964456A EP99964456A EP1147543A1 EP 1147543 A1 EP1147543 A1 EP 1147543A1 EP 99964456 A EP99964456 A EP 99964456A EP 99964456 A EP99964456 A EP 99964456A EP 1147543 A1 EP1147543 A1 EP 1147543A1
Authority
EP
European Patent Office
Prior art keywords
tube
tube neck
focusing
cathode ray
cylinder
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
Application number
EP99964456A
Other languages
German (de)
French (fr)
Other versions
EP1147543B1 (en
Inventor
Klaus Burkhardt
Wolfgang Eckhardt
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1147543A1 publication Critical patent/EP1147543A1/en
Application granted granted Critical
Publication of EP1147543B1 publication Critical patent/EP1147543B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/88—Vessels; Containers; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks

Definitions

  • the invention relates to a tube neck for a cathode ray tube with an anode and a focusing cylinder.
  • the invention further relates to a cathode ray tube.
  • cathode ray tubes are usually provided with a tube neck, which is made of glass and has a metal anode and a metal focusing cylinder.
  • the anode and the focusing cylinder are part of an electron beam generator known per se, which further comprises a cathode, a control grid and a screen grid arranged downstream of this control grid.
  • German patent application 198 24 783.4 proposes an electrode arrangement which comprises a plurality of electrodes and serves as an electron gun for focusing an electron beam.
  • This electrode arrangement is constructed monolithically from several ceramic layers.
  • the present invention has for its object to provide a tube neck of the type mentioned, which enables improved image sharpness and improved high-voltage flashover behavior of the tubes.
  • the tube neck is made of non-conductive material, in particular ceramic, the inside of the anode cylinder and the inside and outside of the focusing cylinder being coated with an electrically conductive material.
  • the tube neck is provided with a recess which has a connection for applying a focusing voltage.
  • connection is provided with an opening through which a vacuum can be generated in the cathode ray tube.
  • Figures 1 to 3 a tube neck in a side view, in a sectional view and in a perspective view and
  • Figure 4 is a schematic diagram of a cathode ray tube known per se.
  • a glass bulb 1 of a cathode ray tube essentially comprises a tube neck 2, a funnel-shaped part 3, which has an anode connection 4, and a tube plate 6 provided with a luminous layer 5.
  • An inner coating of the glass bulb 1 consists of an electrically conductive coating, e.g. B. from an aluminum layer 7, which is used to derive the electrons emitted by a cathode 8 on the luminous layer 5, and from an outer coating of a graphite layer
  • the graphite layer 9 and the aluminum layer 7 represent a capacitor which serves to smooth the anode voltage.
  • the pipe neck 2 is provided with a focusing cylinder 13 made of sheet metal parts and an anode cylinder 14 which is connected to the aluminum layer 7 at connections 15.
  • FIG. 1 shows a side view of a cylindrical tube neck 16 made of ceramic material.
  • the tube neck 16 has an essentially conical recess 17 which is provided with a metallic layer. This metallic layer makes it possible to apply a focusing voltage to a focusing cylinder of the tube neck 16.
  • a ball 18 can be inserted into the conical recess 17 and, after the cathode ray tube has been evacuated, closes the tubes in a vacuum-tight manner.
  • FIG. 2 shows the representation of the section AA
  • FIG. 3 shows a perspective view of the tube neck 16 according to FIG. 1.
  • the tube neck 16 comprises a focusing cylinder 19 and an anode cylinder 20, of which the anode cylinder 20 is coated on its inside and the focusing cylinder 19 on its inside and outside with an electrically conductive material 21.
  • the use of ceramic material for the production of the tube neck 16 enables simple manufacture of flat surfaces of the focusing and anode cylinders 19, 20, which means that such tube neck of a cathode ray tube brings about very good image sharpness.
  • the side faces of the recess 17 are also coated with this electrically conductive material 21, via which a focusing voltage can be supplied to the focusing cylinder 19.
  • the tube neck 16 is provided with a ceramic electrode arrangement 22 proposed in German patent application 198 24 783.4, which is provided for focusing the electron beam.
  • a cylindrical ceramic End cap 23 is used for the vacuum-tight covering of the tube neck and the cathode ray tube.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

In order to improve the definition and the breakdown behavior in a tube neck (16) that includes an anode cylinder (20) and a focusing cylinder (19), the tube neck (16) is made of a non-conductive material, particularly a ceramic. The inner surface of the anode cylinder (20) and the inner surface and the outer surface of the focusing cylinder (19) are coated with an electrically conductive material (21).

Description

Beschreibungdescription
Röhrenhals für eine KathodenstrahlrohreTube neck for a cathode ray tube
Die Erfindung betrifft einen Rohrenhals für eine Kathodenstrahlröhre mit einem Anoden- und einem Fokussierzylmder . Ferner betrifft die Erfindung eine Kathodenstrahlrohre.The invention relates to a tube neck for a cathode ray tube with an anode and a focusing cylinder. The invention further relates to a cathode ray tube.
Konventionelle Kathodenstrahlrohren sind gewöhnlich mit einem Röhrenhals versehen, welcher aus Glas besteht und einen metallenen Anoden- und einen metallenen Fokussierzylmder aufweist. Der Anoden- und der Fokussierzylmder sind Bestandteil eines an sich bekannten Elektronenstrahlerzeugers, welcher ferner eine Kathode, ein Steuergitter und ein diesem Steuer- gitter nachgeordnetes Schirmgitter umfaßt. Insbesondere m hochauflösenden Monitoren ist es erforderlich, den Fokussierzylmder zentπsch m dem Anodenzylinder anzuordnen, um eine ausreichende Bildschärfe zu gewährleisten.Conventional cathode ray tubes are usually provided with a tube neck, which is made of glass and has a metal anode and a metal focusing cylinder. The anode and the focusing cylinder are part of an electron beam generator known per se, which further comprises a cathode, a control grid and a screen grid arranged downstream of this control grid. In particular in the case of high-resolution monitors, it is necessary to arrange the focusing cylinder in the center of the anode cylinder in order to ensure sufficient image sharpness.
In der deutschen Patentanmeldung 198 24 783.4 wird eine Elektrodenanordnung vorgeschlagen, welche mehrere Elekroden umfaßt und als Elektronenkanone zur Fokussierung eines Elektronenstrahls dient. Diese Elektrodenanordnung ist monolithisch aus mehreren Keramiklagen aufgebaut.German patent application 198 24 783.4 proposes an electrode arrangement which comprises a plurality of electrodes and serves as an electron gun for focusing an electron beam. This electrode arrangement is constructed monolithically from several ceramic layers.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Röhrenhals der eingangs genannten Art zu schaffen, welcher eine verbesserte Bildschärfe und em verbessertes Hochspan- nungs-Uberschlagsverhalten der Rohre ermöglicht.The present invention has for its object to provide a tube neck of the type mentioned, which enables improved image sharpness and improved high-voltage flashover behavior of the tubes.
Diese Aufgabe wird dadurch gelost, daß der Rohrenhals aus nichtleitendem Material, insbesondere aus Keramik, besteht, wobei die Innenseite des Anodenzylinders und die Innen- und Außenseite des Fokussierzylmders mit einem elektrisch lei- tenden Material beschichtet ist. In einer vorteilhaften Ausgestaltung der Erfindung ist der Röhrenhals mit einer Ausnehmung versehen, welche einen Anschluß zum Anlegen einer Fokussierspannung aufweist.This object is achieved in that the tube neck is made of non-conductive material, in particular ceramic, the inside of the anode cylinder and the inside and outside of the focusing cylinder being coated with an electrically conductive material. In an advantageous embodiment of the invention, the tube neck is provided with a recess which has a connection for applying a focusing voltage.
In einer weiteren Ausgestaltung der Erfindung ist der Anschluß mit einer Öffnung versehen, durch welche in der Kathodenstrahlröhre ein Vakuum erzeugt werden kann.In a further embodiment of the invention, the connection is provided with an opening through which a vacuum can be generated in the cathode ray tube.
Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den weiteren Unteransprüchen.Further advantageous embodiments of the invention result from the further subclaims.
Anhand der Zeichnung, in der ein Ausführungsbeispiel der Erfindung veranschaulicht ist, werden im folgenden die Erfindung, deren Ausgestaltungen sowie Vorteile näher er- läutert.The invention, its configurations and advantages are explained in more detail below with reference to the drawing, in which an exemplary embodiment of the invention is illustrated.
Es zeigenShow it
Figuren 1 bis 3 einen Röhrenhals in einer Seitenansicht, in einer Schnittdarstellung und in einer per- spektivischen Ansicht undFigures 1 to 3 a tube neck in a side view, in a sectional view and in a perspective view and
Figur 4 eine Prinzipdarstellung einer an sich bekannten Kathodenstrahlröhre.Figure 4 is a schematic diagram of a cathode ray tube known per se.
Es wird zunächst auf Figur 4 verwiesen. Ein Glaskolben 1 einer Kathodenstrahlröhre umfaßt im wesentlichen einen Röhrenhals 2, einen trichterförmigen Teil 3, der einen Anodenanschluß 4 aufweist, und einen mit einer Leuchtschicht 5 versehenen Röhrenboden 6. Ein innerer Belag des Glaskolbens 1 besteht aus einem elektrisch leitenden Belag, z. B. aus einer Aluminiumschicht 7, die zur Ableitung der von einer Kathode 8 auf die Leuchtschicht 5 ausgesendeten Elektronen dient, und aus einem äußeren Belag aus einer GraphitschichtReference is first made to FIG. 4. A glass bulb 1 of a cathode ray tube essentially comprises a tube neck 2, a funnel-shaped part 3, which has an anode connection 4, and a tube plate 6 provided with a luminous layer 5. An inner coating of the glass bulb 1 consists of an electrically conductive coating, e.g. B. from an aluminum layer 7, which is used to derive the electrons emitted by a cathode 8 on the luminous layer 5, and from an outer coating of a graphite layer
9. Die Graphitschicht 9 und die Aluminiumschicht 7 stellen einen Kondensator dar, welcher zur Glättung der Anoden- Spannung dient. Im Röhrenhals 2 ist e Elektronenstrahl- erzeuger angeordnet, welcher die Kathode 8, ein Steuergitter9. The graphite layer 9 and the aluminum layer 7 represent a capacitor which serves to smooth the anode voltage. An electron beam generator, which is the cathode 8, a control grid, is arranged in the tube neck 2
10, ein dem Steuergitter 10 nachgeordnetes Schirmgitter 11 sowie eine Fokussieremrichtung 12 umfaßt. Der Rohrenhals 2 ist mit einem aus Blechteilen hergestellten Fokussierzylmder 13 und einem Anodenzylinder 14 versehen, welcher an Anschlüssen 15 mit der Alummiumschicht 7 verbunden ist.10, a screen grid 11 arranged downstream of the control grid 10 and a focusing device 12. The pipe neck 2 is provided with a focusing cylinder 13 made of sheet metal parts and an anode cylinder 14 which is connected to the aluminum layer 7 at connections 15.
Im folgenden wird auf Figur 1 verwiesen, m welcher em zylindrischer Rohrenhals 16 aus keramischem Material m einer Seitenansicht dargestellt ist. Der Rohrenhals 16 weist eine im wesentlichen konisch ausgebildete Ausnehmung 17 auf, welche mit einer metallischen Schicht versehen ist. Durch diese metallische Schicht ist es möglich, eine Fokussier- spannung an einen Fokussierzylmder des Rohrenhalses 16 anzulegen. In die konische Ausnehmung 17 ist eine Kugel 18 einsetzbar, die nach einer Evakuierung der Kathodenstrahl- röhre die Rohre vakuumdicht verschließt.In the following, reference is made to FIG. 1, which shows a side view of a cylindrical tube neck 16 made of ceramic material. The tube neck 16 has an essentially conical recess 17 which is provided with a metallic layer. This metallic layer makes it possible to apply a focusing voltage to a focusing cylinder of the tube neck 16. A ball 18 can be inserted into the conical recess 17 and, after the cathode ray tube has been evacuated, closes the tubes in a vacuum-tight manner.
Im folgenden wird auf Figur 2 und 3 verwiesen. Figur 2 zeigt die Darstellung des Schnitts A-A und Figur 3 eine perspektivische Ansicht des Rohrenhalses 16 gemäß Figur 1. Die m den Figuren 1, 2 und 3 gleichen Teile sind mit gleichen Bezugszeichen versehen. Der Rohrenhals 16 umfaßt einen Fokussierzylmder 19 und einen Anodenzylinder 20, von denen der Anodenzylinder 20 auf seiner Innenseite und der Fokussierzylmder 19 auf semer Innen- und seiner Außenseite mit einem elektrisch leitenden Material 21 Deschichtet ist. Die Verwendung von keramischem Material zur Herstellung des Rohrenhalses 16 ermöglicht eine einfache Fertigung planer Oberflachen der Fokussier- und Anodenzylinder 19, 20, was bedeutet, daß em derartiger Rohrenhals einer Kat oden- Strahlrohre eine sehr gute Bildscharfe bewirkt. Die Seiten- flachen der Ausnehmung 17 sind ebenfalls mit diesem elektrisch leitenden Material 21 beschichtet, über das dem Fokussierzylmder 19 eine Fokussierspannung zufuhrbar ist. Der Rohrenhals 16 ist mit einer m der deutschen Patent- an eldung 198 24 783.4 vorgeschlagenen keramischen Elektrodenanordnung 22 versehen, die zur Fokussierung des Elek- tronenstrahls vorgesehen ist. Eine zylindrische keramische Abschlußkappe 23 dient der vakuumdichten Abdeckung des Röhrenhalses und der Kathodenstrahlröhre. In the following, reference is made to FIGS. 2 and 3. FIG. 2 shows the representation of the section AA and FIG. 3 shows a perspective view of the tube neck 16 according to FIG. 1. The parts that are the same in FIGS. 1, 2 and 3 are provided with the same reference numerals. The tube neck 16 comprises a focusing cylinder 19 and an anode cylinder 20, of which the anode cylinder 20 is coated on its inside and the focusing cylinder 19 on its inside and outside with an electrically conductive material 21. The use of ceramic material for the production of the tube neck 16 enables simple manufacture of flat surfaces of the focusing and anode cylinders 19, 20, which means that such tube neck of a cathode ray tube brings about very good image sharpness. The side faces of the recess 17 are also coated with this electrically conductive material 21, via which a focusing voltage can be supplied to the focusing cylinder 19. The tube neck 16 is provided with a ceramic electrode arrangement 22 proposed in German patent application 198 24 783.4, which is provided for focusing the electron beam. A cylindrical ceramic End cap 23 is used for the vacuum-tight covering of the tube neck and the cathode ray tube.

Claims

Patentansprüche claims
1. Röhrenhals für eine Kathodenstrahlröhre mit einem Anoden- und einem Fokussierzylinder, dadurch gekennzeichnet, daß der Röhrenhals (16) aus nichtleitendem Material, insbesondere aus Keramik, besteht, wobei die Innenseite des Anodenzylinders (20) und die Innen- und Außenseite des Fokus- sierzylinders (19) mit einem elektrisch leitenden Material (21) beschichtet ist.1. tube neck for a cathode ray tube with an anode and a focusing cylinder, characterized in that the tube neck (16) consists of non-conductive material, in particular ceramic, the inside of the anode cylinder (20) and the inside and outside of the focus sierzylinders (19) with an electrically conductive material (21) is coated.
2. Röhrenhals nach Anspruch 1, dadurch gekennzeichnet, daß der Röhrenhals (16) mit einer Ausnehmung (17) versehen ist, welche einen Anschluß zum Anlegen einer Fokussier- spannung aufweist.2. Tube neck according to claim 1, characterized in that the tube neck (16) is provided with a recess (17) which has a connection for applying a focusing voltage.
3. Röhrenhals nach Anspruch 2, dadurch gekennzeichnet, daß der Anschluß eine Öffnung zum Evakuieren der Kathodenstrahlröhre aufweist.3. Tube neck according to claim 2, characterized in that the connection has an opening for evacuating the cathode ray tube.
4. Röhrenhals nach Anspruch 2, dadurch gekennzeichnet, daß die Ausnehmung (17) im wesentlichen konusförmig ausgebildet ist und mit einer metallischen Schicht (21) zum Anlegen einer Fokussierspannung versehen ist.4. Tube neck according to claim 2, characterized in that the recess (17) is substantially conical and is provided with a metallic layer (21) for applying a focusing voltage.
5. Röhrenhals nach Anspruch 4, dadurch gekennzeichnet, daß zum vakuumdichten Verschließen der Kathodenstrahlröhre ein im wesentlichen kugelförmiges Verschlußmittel (18) in die Ausnehmung (17) einsetzbar ist.5. A tube neck according to claim 4, characterized in that a substantially spherical closure means (18) can be inserted into the recess (17) for the vacuum-tight closure of the cathode ray tube.
6. Kathodenstrahlröhre mit einem Röhrenhals nach einem der Ansprüche 1 bis 5. 6. cathode ray tube with a tube neck according to one of claims 1 to 5.
EP99964456A 1998-12-28 1999-12-21 Tube neck for cathode-ray tube Expired - Lifetime EP1147543B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE29823118U 1998-12-28
DE29823118U DE29823118U1 (en) 1998-12-28 1998-12-28 Tube neck for a cathode ray tube
PCT/DE1999/004061 WO2000039834A1 (en) 1998-12-28 1999-12-21 Tube neck for cathode-ray tube

Publications (2)

Publication Number Publication Date
EP1147543A1 true EP1147543A1 (en) 2001-10-24
EP1147543B1 EP1147543B1 (en) 2004-05-06

Family

ID=8067233

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99964456A Expired - Lifetime EP1147543B1 (en) 1998-12-28 1999-12-21 Tube neck for cathode-ray tube

Country Status (6)

Country Link
US (1) US6504296B2 (en)
EP (1) EP1147543B1 (en)
JP (1) JP2003529890A (en)
AT (1) ATE266255T1 (en)
DE (2) DE29823118U1 (en)
WO (1) WO2000039834A1 (en)

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US7164629B2 (en) * 2002-01-22 2007-01-16 Ricoh Company, Ltd. Method of controlling an optical disk apparatus
US6952466B2 (en) * 2002-11-12 2005-10-04 Ge Medical Systems Global Technology Company, Llc Oil-free electron source for an EBT scanner
US6891321B2 (en) * 2002-11-12 2005-05-10 Ge Medical Systems Global Technology Company, Llc Oil-free electron source having cathode and anode members adjustable with five degrees of freedom

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DE2649617A1 (en) 1975-10-31 1977-05-12 Nippon Telegraph & Telephone Travelling electron wave tube with annular electrodes - has internal taper and channelling electrode to reduce arcing due to gas ionisation
GB1598888A (en) 1978-05-30 1981-09-23 Philips Electronic Associated Electron display tubes
NL7809345A (en) * 1978-09-14 1980-03-18 Philips Nv CATHED BEAM TUBE.
US4350925A (en) 1980-07-09 1982-09-21 Rca Corporation Main lens assembly for an electron gun
US4585976A (en) * 1982-01-19 1986-04-29 Hewlett-Packard Company Beam penetration CRT with internal automatic constant deflection factor and pattern correction
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Also Published As

Publication number Publication date
DE59909428D1 (en) 2004-06-09
US20020003395A1 (en) 2002-01-10
US6504296B2 (en) 2003-01-07
WO2000039834A1 (en) 2000-07-06
ATE266255T1 (en) 2004-05-15
DE29823118U1 (en) 1999-02-25
JP2003529890A (en) 2003-10-07
EP1147543B1 (en) 2004-05-06

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