EP0137373B1 - Système de canon électronique pour tubes à rayons cathodiques multiples, tels que tubes d'images en couleurs - Google Patents
Système de canon électronique pour tubes à rayons cathodiques multiples, tels que tubes d'images en couleurs Download PDFInfo
- Publication number
- EP0137373B1 EP0137373B1 EP84111219A EP84111219A EP0137373B1 EP 0137373 B1 EP0137373 B1 EP 0137373B1 EP 84111219 A EP84111219 A EP 84111219A EP 84111219 A EP84111219 A EP 84111219A EP 0137373 B1 EP0137373 B1 EP 0137373B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- electron
- segments
- expansion coefficient
- gun system
- 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
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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
- H01J29/484—Eliminating deleterious effects due to thermal effects, electrical or magnetic fields; Preventing unwanted emission
Definitions
- the invention relates to an electron beam generation system for multiple cathode ray tubes, such as color picture tubes, with cathodes and a plurality of electrodes which follow one another and lie one behind the other in the electron beam direction, at least one of which has a substantially greater spatial dimension in the electron beam direction than the other electrodes and consists of at least two segments and in which the electrodes are made of different materials.
- At least the first three electrodes are made of different materials when viewed in the beam direction.
- the coefficients of thermal expansion of the materials of the electrodes are increasingly staggered from the cathode to the screen such that the changes in distance in the beam direction between the adjacent openings of the electrodes, through which the electron beams pass, decrease linearly when the electrode beam generation system is at operating temperature.
- This measure ensures that the voltages occurring in the electron beam generating system as a result of its heating to such high temperatures are as low as possible and that the electron-optical lenses present between the electrodes can have the most undisturbed effect on the electron beams.
- the offset between an electrode opening in the electrode G3 of an external electron beam and the corresponding electrode opening in the Electrode G4 with a center distance of the electrode openings of 6.6 mm is approximately 1.5 ⁇ m.
- the displacement of the light spots generated by the two outer electron beams in a color picture tube with each other, that is, the red and blue light spots then thus amounts to about 0.4 mm in the center of the screen. This is a clearly visible t misconvergence.
- any remaining misconvergence in the steady state of the color picture tube i.e. when their electron gun has reached operating temperature, can be corrected in a known manner with a convergence unit.
- this misconvergence that occurs during the heating phase is of course undesirable.
- the object on which the invention is based is therefore to further develop the known electron beam generation system in such a way that the least possible offset between the electrodes occurs in the heating phase and that any offset that does occur is below the interference limit.
- the electrodes G2 and G4 adjacent to the larger electrode G3 and the segments of the larger electrode G3 adjacent to these electrodes consist of materials with different coefficients of thermal expansion such that the material of the electrode segment adjacent to electrode G4 has a smaller coefficient of thermal expansion than that Material of the electrode G4 and the material of the electrode segment adjacent to the electrode G2 has a greater or the same coefficient of thermal expansion than the material of the electrode G2.
- the electron gun is designed in this way, there will be less offset between the electrodes during its heating-up period and / or the period in which misconvergence will occur due to the offset is shorter than in the known electron gun systems, so that the convergence correction required is less is and can be done much sooner.
- FIGS. 1 to 3 A “unitized gun” electron beam generating system for a “inline” color picture tube is illustrated in FIGS. 1 to 3.
- Such an electron beam generation system has - as can be clearly seen from FIG. 3 - an approximately rectangular cross section and, arranged parallel to one another on a line, contains three electron beam generation systems which are each intended to excite the red, green and blue light spots on the screen of the color picture tube.
- the electron gun has three individual cathodes 1 and electrodes G1, G2, G3 and G4.
- the electrodes consist either of individual (G1, G2 and G4) or of several, composite, pot-shaped metal bodies with an edge, which are melted into the glass rods 3 either at the edges or on additional holding parts 2 connected to the electrodes or segments.
- the electrode G3 has the greatest length of all electrodes and is composed of the electrode segments 4, 5, 6 and 7.
- further electrode segments 8 and 9 are present within the electrode segments 6 and 7.
- the electrode segments forming the electrode G3 are connected to one another in a non-positive and / or positive manner. As a rule, the connection is made by spot welding.
- the electrodes are provided with openings through which the electron beams emanating from the cathodes 1 pass on their way to the screen.
- the openings in the same electrode or in the same electrode segment are arranged on a line next to one another and at the same distance from one another, as illustrated in FIG. 3. This distance at room temperature is denoted by Q.
- the openings of different electrodes have a different diameter; however, they are arranged concentrically to a common axis of symmetry. Since the electrodes have different electrical potentials during operation of the color picture tube, electron-optical lenses are formed between them, which influence the path of the electron beams.
- the invention deals with the changes in the electron-optical lenses due to the different expansions of the electrodes during the heating phase of the electrode beam generation system to the operating temperature, which lead to the misconvergences already mentioned at the beginning.
- the cathodes have a temperature of approximately 760 ° C. in the operating state.
- the electrode G2 has a temperature of approximately 150 ° C, the electrode segment 4 a temperature of approximately 100 ° C, the electrode segment 7 a temperature of approximately 85 ° C and the electrode G4 a temperature of approximately 70 ° C.
- the convergence errors in the heating phase of the color picture tube can be very greatly reduced if different materials are used for the electrodes G4 and G2 and the electrode segments 7 and 4 in the manner according to the invention. Materials are used which have a coefficient of thermal expansion between 1.0 x 10- 5 ° C -1 and 1.7 x 10- 5 ° C- 'at the application temperatures between 20 ° C and 150 ° C.
- an austenitic stainless steel As a material with the coefficient of thermal expansion of 1.7 x 10- 5 ° C- 1, an austenitic stainless steel has in embodiments been found suitable, of the 16-20 wt .-% Cr, 8-12 wt .-% Ni and remainder iron. This material is not ferromagnetic at room temperature.
- a series of austenitic steels are useful whose thermal expansion coefficient is 1.7 to 1.9 x 10- 5 ° C-. 1
- a nickel-chromium-iron alloy can be used, which, from 72 wt .-% Ni 14-21 wt .-% CR and max 10% FE.
- alloys which contain approximately 80% by weight of Ni and approximately 20% by weight of Cr or whose composition consists of approximately 65% by weight of Ni, approximately 30% by weight of Cr and a maximum 1 wt .-% Fe exists. These alloys are also not ferromagnetic at room temperature.
- Materials which are ferromagnetic at room temperature such as an alloy of 48-54% by weight of Ni, a maximum of 2% by weight of Cr and the rest of Fe or with approximately 72% by weight of Fe and can also be used for the electrode G2 approx. 28% by weight Cr.
- the electrode segment 7 consists of a material with 80% by weight Ni and 20% by weight Cr, then the electrode segments 4, 5 and 6 can consist of an austenitic chromium-nickel steel.
- electrode segments 7 and 9 are formed in several parts, such as the part of the electrode G3 consisting of the electrode segments 7, 8 and 9, then it is advantageous if all the electrode segments consist of the same material. However, it is possible that there are only slight deviations if the electrode segments 8 and 9 are made from a material with a slightly different temperature expansion coefficient than that of the electrode segment 7 from a material with> 72% by weight Ni, 14-21% by weight. % Cr and> 10 wt .-% Fe and the electrode segments 8 and 9 consist of an austenitic chromium-nickel steel.
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833334242 DE3334242A1 (de) | 1983-09-22 | 1983-09-22 | Elektronenstrahlerzeugungssystem fuer mehrfachkathodenstrahlroehren, wie farbbildroehren |
DE3334242 | 1983-09-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0137373A1 EP0137373A1 (fr) | 1985-04-17 |
EP0137373B1 true EP0137373B1 (fr) | 1988-01-27 |
Family
ID=6209756
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84111219A Expired EP0137373B1 (fr) | 1983-09-22 | 1984-09-20 | Système de canon électronique pour tubes à rayons cathodiques multiples, tels que tubes d'images en couleurs |
Country Status (5)
Country | Link |
---|---|
US (1) | US4631442A (fr) |
EP (1) | EP0137373B1 (fr) |
JP (1) | JPS6095836A (fr) |
CA (1) | CA1216016A (fr) |
DE (2) | DE3334242A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2553035B2 (ja) * | 1985-06-19 | 1996-11-13 | 株式会社日立製作所 | カラ−受像管用電子銃 |
JP2815169B2 (ja) * | 1989-03-18 | 1998-10-27 | 株式会社日立製作所 | インライン型電子銃 |
US5010271A (en) * | 1989-10-24 | 1991-04-23 | Rca Licensing Corporation | Color picture tube having an electron gun with reduced convergence drift |
US4952186A (en) * | 1989-10-24 | 1990-08-28 | Rca Licensing Corporation | Method of making a color picture tube electron gun with reduced convergence drift |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2642560C2 (de) * | 1976-09-22 | 1983-08-04 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Farbbildkathodenstrahlröhre |
NL7902159A (nl) * | 1979-03-20 | 1980-09-23 | Philips Nv | Kleurentelevisiebeeldbuis. |
DE2920151C2 (de) * | 1979-05-18 | 1985-04-11 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Elektronenstrahlerzeugungssystem für Kathodenmehrstrahlröhren |
JPS56130063A (en) * | 1980-03-17 | 1981-10-12 | Mitsubishi Electric Corp | Electron gun electrode |
JPS56153652A (en) * | 1980-04-30 | 1981-11-27 | Toshiba Corp | Electron gun frame for color cathode-ray tube |
-
1983
- 1983-09-22 DE DE19833334242 patent/DE3334242A1/de not_active Withdrawn
-
1984
- 1984-09-20 EP EP84111219A patent/EP0137373B1/fr not_active Expired
- 1984-09-20 DE DE8484111219T patent/DE3469103D1/de not_active Expired
- 1984-09-21 JP JP59196942A patent/JPS6095836A/ja active Granted
- 1984-09-21 CA CA000463714A patent/CA1216016A/fr not_active Expired
- 1984-09-21 US US06/653,753 patent/US4631442A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CA1216016A (fr) | 1986-12-30 |
DE3334242A1 (de) | 1985-04-04 |
JPH0410697B2 (fr) | 1992-02-26 |
US4631442A (en) | 1986-12-23 |
DE3469103D1 (en) | 1988-03-03 |
JPS6095836A (ja) | 1985-05-29 |
EP0137373A1 (fr) | 1985-04-17 |
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