EP0137373A1 - 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
- EP0137373A1 EP0137373A1 EP84111219A EP84111219A EP0137373A1 EP 0137373 A1 EP0137373 A1 EP 0137373A1 EP 84111219 A EP84111219 A EP 84111219A EP 84111219 A EP84111219 A EP 84111219A EP 0137373 A1 EP0137373 A1 EP 0137373A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- segments
- electron beam
- electrodes
- generation 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.)
- Granted
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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 image 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 the electrodes consist of different materials.
- 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 in such a way that the changes in distance in the beam direction between those lying next to one another Open the openings of the electrodes, through which the electron beams pass, linearly when the electrode beam generation system is at operating temperature.
- This measure ensures that the voltages occurring in the electron beam generation 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 one 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 shift the light spots generated by the two outer electron beams of a color picture tube, ie the red and blue light spots, is then about 0.4 mm in the center of the screen. This is a clearly visible misconvergence.
- 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 occurs does not exceed the interference limit.
- this object is achieved in that the electrodes G2 and G4 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 the electrode G4 has a smaller temperature expansion coefficient than the material of the electrode G4 and the material of the electrode segment adjacent to the electrode G2 a larger one or the has the same temperature expansion coefficient as 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 time 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.
- FIG. 1 to 3 illustrate a so-called "unitized gun” electron gun system for a so-called “inLine” color picture tube.
- Such an electron gun has - as can be clearly seen from Fig. 3 - an approximately rectangular cross section and, arranged parallel to each other on a line, contains three electron gun systems, each of which should 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 the electrodes G1, G2, G3 and G4.
- the electrodes consist either of individual (G1, G2 and G4) or of several, composite, cup-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.
- the electrode segments forming the electrode G3 are connected to one another in a non-positive and / or positive manner. In the rule, the connection is made by spot welding.
- the electrodes are provided with openings through which the cathodes 1 outgoing electron beams 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 different diameters; however, they are arranged concentrically to a common axis of symmetry. Since the electrodes have different electrical potentials when the color tube is in operation, electron-optical lenses are formed between them, which influence the path of the electron beams.
- the invention is concerned with the changes in the electron-optical lenses due to the different dimensions of the electrodes during the heating-up phase of the electrode-beam generating system to the operating temperature, which lead to the misconvergences already mentioned at the beginning.
- the cathodes have a temperature of about 760 ° C in the operating state.
- the electrode G2 has a temperature of approx. 150 ° C, the electrode segment 4 a temperature of approx. 100 ° C, the EL electrode segment 7 a temperature of approx. 85 ° C and the electrode G4 a temperature of approx. 70 ° C.
- the convergence errors in the heating phase of the color picture tube can be 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. Thereby materials become set, which have at the use temperatures between 20 ° C and 150 0 C temperature expansion coefficients between 1 , 0 x 10 5 ° C -1 and 1, 7 x 10 -5 ° C -1 .
- a nickel-chromium-iron alloy can be used, consisting of ⁇ 72 wt.% Ni, 14 - 21 wt.% Cr and max. 10% Fe.
- alloys which contain about 80% by weight of Ni and about 20% by weight of Cr or whose composition consists of about 65% by weight of Ni, about 30% by weight of Cr and a maximum of 1% by weight Fe exists. These alloys are also not ferromagnetic at room temperature.
- Materials that are ferromagnetic at room temperature such as an alloy of 48-54 wt.% Ni, a maximum of 2 wt.% Cr and the rest of Fe or with approx. 72 wt.% Fe and approx. 28 can also be used for the electrode G2 % Cr.
- the electrode segment 7 consists of a material with 80% by weight of Ni and 20% by weight of Cr, then the electrode segments 4, 5 and 6 can consist of an austenitic chrome nickel steel.
- the electrode segments 7 and 9 can be made of a material with ⁇ 72 GewX Ni, 14-21% by weight Cr and ⁇ 10% by weight Fe and the electrode segments 8 and 9 can be made of an austenitic chrome-nickel steel.
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
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 true EP0137373A1 (fr) | 1985-04-17 |
| EP0137373B1 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0425206A3 (en) * | 1989-10-24 | 1991-11-21 | Thomson Consumer Electronics, Inc. | Method of making a colour picture tube electron gun with reduced convergence drift |
| EP0425205A3 (en) * | 1989-10-24 | 1991-11-21 | Thomson Consumer Electronics, Inc. | Color picture tube having an electron gun with reduced convergence drift |
Families Citing this family (2)
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4138624A (en) * | 1976-09-22 | 1979-02-06 | Licentia Patent-Verwaltungs Gmbh | Color television cathode ray tube gun mounting |
| DE2920151A1 (de) * | 1979-05-18 | 1980-12-18 | Standard Elektrik Lorenz Ag | Elektronenstrahl-erzeugungssystem fuer kathodenstrahlroehren |
| US4331904A (en) * | 1979-03-20 | 1982-05-25 | U.S. Philips Corporation | Color television display tube |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 DE DE8484111219T patent/DE3469103D1/de not_active Expired
- 1984-09-20 EP EP84111219A patent/EP0137373B1/fr not_active Expired
- 1984-09-21 CA CA000463714A patent/CA1216016A/fr not_active Expired
- 1984-09-21 JP JP59196942A patent/JPS6095836A/ja active Granted
- 1984-09-21 US US06/653,753 patent/US4631442A/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4138624A (en) * | 1976-09-22 | 1979-02-06 | Licentia Patent-Verwaltungs Gmbh | Color television cathode ray tube gun mounting |
| US4331904A (en) * | 1979-03-20 | 1982-05-25 | U.S. Philips Corporation | Color television display tube |
| DE2920151A1 (de) * | 1979-05-18 | 1980-12-18 | Standard Elektrik Lorenz Ag | Elektronenstrahl-erzeugungssystem fuer kathodenstrahlroehren |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0425206A3 (en) * | 1989-10-24 | 1991-11-21 | Thomson Consumer Electronics, Inc. | Method of making a colour picture tube electron gun with reduced convergence drift |
| EP0425205A3 (en) * | 1989-10-24 | 1991-11-21 | Thomson Consumer Electronics, Inc. | Color picture tube having an electron gun with reduced convergence drift |
| TR24860A (tr) * | 1989-10-24 | 1992-07-01 | Thomson Consumer Electronics | YAKINSAMA SAVRULMASI AZALTILMIS BIR ELEKTRON TABANCASI OLAN RENKLI RESIM TüPü. |
| TR24852A (tr) * | 1989-10-24 | 1992-07-01 | Thomson Consumer Electronics | YAKINSAMA SAVRULMASI AZALTILMIS BIR RENKLI RESIM TüPü ELEKTRON TABANCASININ YAPILMASI ICIN YÖNTEM |
Also Published As
| Publication number | Publication date |
|---|---|
| CA1216016A (fr) | 1986-12-30 |
| US4631442A (en) | 1986-12-23 |
| JPH0410697B2 (fr) | 1992-02-26 |
| DE3334242A1 (de) | 1985-04-04 |
| JPS6095836A (ja) | 1985-05-29 |
| DE3469103D1 (en) | 1988-03-03 |
| EP0137373B1 (fr) | 1988-01-27 |
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