EP0763846B1 - Kathodenstrahlröhre - Google Patents
Kathodenstrahlröhre Download PDFInfo
- Publication number
- EP0763846B1 EP0763846B1 EP96114110A EP96114110A EP0763846B1 EP 0763846 B1 EP0763846 B1 EP 0763846B1 EP 96114110 A EP96114110 A EP 96114110A EP 96114110 A EP96114110 A EP 96114110A EP 0763846 B1 EP0763846 B1 EP 0763846B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grid electrode
- ray tube
- cathode ray
- aperture opening
- aperture
- 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.)
- Expired - Lifetime
Links
Images
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
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
- H01J29/485—Construction of the gun or of parts thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
- H01J3/02—Electron guns
- H01J3/027—Construction of the gun or parts thereof
Definitions
- the invention relates to a cathode ray tube according to the preamble of the claim 1.
- Such tubes are used in particular as display tubes.
- the resolution and contrast of the display are provided by the tube structure conditional capacities, especially between neighboring electrodes, is a problem due to the limit frequency that is thereby determined.
- GB 656 617 describes a beam generation system of a cathode ray tube, in which a first, spaced apart from the cathode Grid electrode as a metallic film on a thin ceramic substrate is trained.
- a second grid electrode can be on the side facing away from the cathode Side of the ceramic substrate formed as a further metallic film or separated from the first grid electrode in a conventional manner be executed.
- a cathode ray tube in which for Reduction of the lattice capacity of a ceramic carrier body on a flat surface Side one first grid electrode and on an opposite side in a conical Recess has a frustoconical second grid electrode.
- the object of the present invention is to provide a cathode ray tube with at least to indicate a control electrode having an aperture, which enables a shift of the cutoff frequency to higher values.
- the total capacity the electron arrangement is significantly reduced while influencing the beam compared to a full-surface metallic grid electrode is changed.
- the thin ceramic film is inexpensive to manufacture and simple to handle and allows a compact arrangement especially in systems with multiple grid electrodes.
- the in FIG. 1 sketched grid electrode consists of one Carrier body T2 made of non-conductive material in the area the aperture B2 a metallized, has an annular surface M. About one or several lines L leading to the edge of the carrier body is the metallized surface M with a control connection contactable.
- the carrier body is preferably approximate circular and has several radially on its circumference external pin Z for mechanical fixation inside of the tube structure. Since the line L only one has electrical but no mechanical function Line width and thus the field influence kept small become.
- the aperture B2 has a diameter DB, the metallized surface has a diameter DF.
- FIG. 2 is a partial example of a relative Electrode geometry of a cathode ray tube according to the invention with a cathode K, a first grid electrode G1 a second grid electrode G2 and a third Grid electrode G3 outlined.
- the first grid electrode G1 is pot-shaped and fully metallic. It has a central first aperture B1. through of an insulating cathode support KT is the cathode K fixed in the first grid electrode.
- the second grid electrode G2 which consists of consists of two spaced apart electrodes G21 and G22, a third grid electrode G3 and others not drawn electrodes.
- the capacitance formed by grid G1 and grid electrode G21 is the capacitance formed by grid G1 and grid electrode G21.
- the invention is therefore particularly advantageous for the formation of the grid electrode G21 with a concentric to the first aperture B1 second aperture B2.
- the metallization M of the second grid electrode G2 in the area of the aperture B2 and the first grid electrode lie on different potential.
- a modulation of the emitted electron beam is usually done by modulating the potential of the first grid electrode G1 at a constant potential of the second grid electrode G21 and hence the voltage between the two grid electrodes. This act as a capacitor, the capacity of which is the possible modulation frequency limited.
- the inventive design of the second grid electrode as a non-conductive carrier body T2 with a metallized surface in the area of the aperture B2, the capacitance of the capacitor can be low kept and a high cutoff frequency can be achieved.
- the exact dimensioning of the metallized surface can be used as a construction parameter be optimized according to the circumstances of the individual case.
- the diameter DF of the metallized area is between 2 times and 10 times of the diameter DB of the aperture, 2DB ⁇ DF ⁇ 10DB. proven has about that for the diameter DF of the metallized surface Choose five times the diameter DB of the aperture B2.
- the carrier body T2 of the second grid electrode is made from a ceramic film with a film thickness in the area of preferably 0.1-0.5 mm.
- the application of the metallic Surface can be created using a method known per se, for example vapor deposition or chemical deposition in Connection with structure etching techniques and possibly additional ones galvanic amplification.
- a metal for example Brazeable MoMn use that is galvanic is reinforced with nickel.
- the metallic surface extends preferably also in the wall of the aperture B2.
- the supply line L can be on any side of the support body be applied when the aperture is metallized is. The arrangement of the line L on the Side facing cathode allows structuring together with the metallic surface M.
- the cathode ray tube can contain several such grid electrodes.
- the Grid electrode structure with a non-conductive support and one Metallization area is in the area of the aperture particularly advantageous for such Grid electrodes of a multi-grid tube, the have a particularly small mutual distance and therefore supply the majority of the electrode capacity.
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
- Microwave Tubes (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Description
- Fig. 1
- eine Aufsicht auf eine Gitterelektrode
- Fig. 2
- einen Längsschnitt durch eine Elektrodenanordnung einer Kathodenstrahlröhre
Claims (2)
- Kathodenstrahlröhre mit einer Kathode (K) und auf diese in Ausbreitungsrichtung des Elektronenstrahls folgend einer ersten Gitterelektrode (G1) mit einer ersten Blendenöffnung (B1) und einer zweiten Gitterelektrode (G2) mit einer zweiten Blendenöffnung (B2), wobei die zweite Gitterelektrode als metallisierte Fläche auf einem Trägerkörper aus nichtleitendem Material angeordnet ist, dadurch gekennzeichnet, daß die erste Gitterelektrode voll metallisch und der Trägerkörper als Keramikfolie mit einer Foliendicke von weniger als 0,5 mm ausgeführt ist und in Ausbreitungsrichtung des Elektronenstrahls auf die erste Gitterelektrode von dieser beabstandet folgt und auf seiner der ersten Gitterelektrode zugewandten Seite die zweite Gitterelektrode als eine kreisförmige metallisierte Fläche (11) im Bereich der zweiten Blendenöffnung (B2) ausgeführt ist, wobei für den Durchmesser DF der metallisierten Fläche (11) bezüglich des Durchmessers DB der zweiten Blendenöffnung die Beziehung 2 DB ≤ DF ≤ 10 DB gilt.
- Kathodenstrahlröhre nach Anspruch 1, dadurch gekennzeichnet, daß die metallisierte Fläche sich in die Wandung der zweiten Blendenöffnung erstreckt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19534124A DE19534124A1 (de) | 1995-09-14 | 1995-09-14 | Kathodenstrahlröhre |
DE19534124 | 1995-09-14 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0763846A2 EP0763846A2 (de) | 1997-03-19 |
EP0763846A3 EP0763846A3 (de) | 1997-11-12 |
EP0763846B1 true EP0763846B1 (de) | 2002-12-18 |
Family
ID=7772186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96114110A Expired - Lifetime EP0763846B1 (de) | 1995-09-14 | 1996-09-04 | Kathodenstrahlröhre |
Country Status (3)
Country | Link |
---|---|
US (1) | US5726527A (de) |
EP (1) | EP0763846B1 (de) |
DE (2) | DE19534124A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19630200A1 (de) * | 1996-07-26 | 1998-01-29 | Aeg Elektronische Roehren Gmbh | Kathodenstrahlröhre |
DE19857800C2 (de) * | 1998-12-15 | 2000-11-30 | Thomson Tubes Electroniques Gm | Elektronenstrahlröhre mit einer Gitter1-Blende |
TWI234210B (en) * | 2002-12-03 | 2005-06-11 | Sanyo Electric Co | Semiconductor module and manufacturing method thereof as well as wiring member of thin sheet |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL58348C (de) * | 1940-03-09 | |||
GB656617A (en) * | 1948-07-13 | 1951-08-29 | Emi Ltd | Improvements relating to electron guns for cathode ray tubes |
US4500809A (en) * | 1979-04-09 | 1985-02-19 | Tektronix, Inc. | Electron gun having a low capacitance cathode and grid assembly |
GB2046511B (en) * | 1979-04-09 | 1983-04-20 | Tektronix Inc | Electron gun having a low capacitance cathode and grid assembly |
DE3339696A1 (de) * | 1983-11-03 | 1984-04-12 | Klaus Dipl.-Ing.(FH) 4150 Krefeld Sundergeld | Bildwiedergabevorrichtung mit flachem bildschirm |
KR970011874B1 (en) * | 1989-07-31 | 1997-07-18 | Lg Electronics Inc | Electron gun for color picture tube |
-
1995
- 1995-09-14 DE DE19534124A patent/DE19534124A1/de not_active Withdrawn
-
1996
- 1996-09-04 EP EP96114110A patent/EP0763846B1/de not_active Expired - Lifetime
- 1996-09-04 DE DE59609993T patent/DE59609993D1/de not_active Expired - Lifetime
- 1996-09-12 US US08/713,086 patent/US5726527A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US5726527A (en) | 1998-03-10 |
DE19534124A1 (de) | 1997-03-20 |
EP0763846A2 (de) | 1997-03-19 |
EP0763846A3 (de) | 1997-11-12 |
DE59609993D1 (de) | 2003-01-30 |
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