EP0146839B1 - Farbbildröhre und Verfahren zu deren Herstellung und Justierung - Google Patents
Farbbildröhre und Verfahren zu deren Herstellung und Justierung Download PDFInfo
- Publication number
- EP0146839B1 EP0146839B1 EP84114760A EP84114760A EP0146839B1 EP 0146839 B1 EP0146839 B1 EP 0146839B1 EP 84114760 A EP84114760 A EP 84114760A EP 84114760 A EP84114760 A EP 84114760A EP 0146839 B1 EP0146839 B1 EP 0146839B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- deflection unit
- electron beams
- picture tube
- raster
- deflection
- 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
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/42—Measurement or testing during manufacture
Definitions
- the invention relates to a color picture tube according to the preamble of the main claim and a method for attaching and adjusting a deflection unit to such a color picture tube.
- a color picture tube which bears a large number of markings on the side of the shadow mask facing the beam generator system. These markings, which also have a strip of phosphorus running in the direction of image deflection, are all arranged in the perforated area of the shadow mask, so that they are struck by the electron beams during normal operation of the color picture tube.
- the signals generated in this way are scanned through a window in the tube bulb and fed to a correction control system which carries out a convergence and / or geometry adjustment of the displayed image.
- the invention has for its object to design a color picture tube so that an automatic adjustment of the deflection unit can take place and to specify a suitable method.
- a color picture tube 19 like a conventional color picture tube, consists of a glass tube bulb 9, a screen 8, a shadow mask 7 of the slit or shadow mask type, a glass tube neck 25 and three jet generator systems 1, 2 mounted in the tube neck , 3.
- an opaque inner coating 10 is attached on the inside of the tube bulb 9, an opaque inner coating 10 is attached.
- a deflection unit 18 is attached to the outside of the color picture tube 19 at the transition from the tube neck 25 to the tube bulb 9. Electron beams 4, 5, 6 emanate from the beam generator systems 1, 2, 3, which are deflected in the region of the deflection unit 18 and which are intended to intersect in the holes in the shadow mask 7.
- the color picture tube 19 also has at least one opening 11 in the inner coating 10.
- the changes to the shadow mask 7 compared to a conventional one are further explained with reference to FIG. 2.
- the rear view of the shadow mask 7 of the color picture tube 19 is shown.
- the shadow mask 7 is attached to the front of a frame 16.
- the edges of the shadow mask 7 are covered on the back by the frame 16.
- There are markings 13a, 13b, 14a, 14b which run in the direction of the image deflection and which consist of a material which emits visible or UV light when an electron beam strikes it.
- the markings preferably consist of phosphor strips.
- the markings 13a, 13b, 14a are applied on the frame 16 and the marking 14b on a marking carrier 17 attached thereon. It is also possible to make markings directly on the shadow mask 7 in its edge region, which, however, must not be shadowed by the frame 16 for the electron beams 4, 5, 6.
- the type and placement of markings should be selected so that a specific error to be corrected can be identified.
- the openings 11 in the inner coating 10 of the tube bulb 9 and the associated photosensitive elements 12, on the other hand, are to be selected such that the largest possible part of the light emanating from the markings can be received from each photosensitive element 12 and that each of any part of one Mark outgoing flash of light from at least one photosensitive element 12 is receivable. Whether a photosensitive element 12 is permanently attached or whether such is only applied temporarily, for example by fitting a corresponding test head, depends primarily on whether one-off adjustment work or regular checks are carried out with the aid of the light received by this photosensitive element 12 should.
- the markings 13a, 13b, 14a, 14b are applied to the frame 16 or the marking carrier 17 in such a way that they are struck by electron beams whose imaginary extensions extend the four centers of the edges of the image screen 8 meet. This makes it possible, in particular, to check the convergence at the four center sides.
- a color picture tube is usually described with a grid that extends only a few percent on all sides beyond the edge of the screen and thus also beyond the perforated part of the shadow mask.
- the markings 13 and 14 which serve to correct the convergence lie outside this range, since a larger grid is written during the adjustment of the color picture tube.
- the correct fit of the deflection unit can be checked well. Not only can the deflection unit be adjusted very well, the adjustment process can also be largely automated.
- the deflection unit 18 is usually attached and adjusted to the color picture tube 19 in such a way that the deflection unit 18 is first preassembled on the tube bulb 9 at the transition to the tube neck 25 and that the color picture tube 19 with the deflection unit 18 is then put into operation such that A grid is written to electron beams. Thereafter, the deflection unit 18 is first shifted on the tube neck 25 of the picture tube 19 such that the electron beams 4, 5, 6 of the three beam generator systems 1, 2, 3 converge in the center of the screen. The deflection unit 28 is then rotated about an axis running in the direction of the line deflection such that the electron beams 4, 5, 6 converge in the middle of the upper and lower raster edges.
- the deflection unit 18 is then rotated about an axis running in the direction of the image deflection in such a way that the electron beams 4, 5, 6 converge in the middle of the right and left raster edges.
- the convergence is usually determined by a test person by checking whether, in the presence of only a single electron beam, only the associated color is present everywhere. If necessary, the process is repeated.
- the deflection unit 18 is then immovably connected to the color picture tube 19.
- this method is modified in such a way that, at least during the setting of the convergence, the grid is written in such capital that the markings 13a, 13b, 14a, 14b are also overwritten by the grid.
- the grid is not written by all jet generator systems 1, 2 and 3 at the same time, but only by one.
- the times that the electron beams need to reach the respective marking 13a, 13b, 14a, 14b from the raster edge on the left when viewing the screen are then measured. An exact adjustment is achieved when all electron beams need the same length to reach a certain marking from the left raster edge. Depending on which electron beam arrives earlier and how big the time difference is, one has to change more or less in one or the other direction.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833346361 DE3346361A1 (de) | 1983-12-22 | 1983-12-22 | Farbbildroehre und verfahren zu deren herstellung und justierung |
DE3346361 | 1983-12-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0146839A1 EP0146839A1 (de) | 1985-07-03 |
EP0146839B1 true EP0146839B1 (de) | 1988-06-01 |
Family
ID=6217664
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84114760A Expired EP0146839B1 (de) | 1983-12-22 | 1984-12-04 | Farbbildröhre und Verfahren zu deren Herstellung und Justierung |
Country Status (5)
Country | Link |
---|---|
US (1) | US4659957A (ja) |
EP (1) | EP0146839B1 (ja) |
JP (1) | JPS60157145A (ja) |
CA (1) | CA1220508A (ja) |
DE (2) | DE3346361A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0226423B1 (en) * | 1985-12-09 | 1991-04-10 | Kabushiki Kaisha Toshiba | Color cathode ray tube |
US4748371A (en) * | 1987-02-10 | 1988-05-31 | Rca Licensing Corporation | Cathode-ray tube shadow mask for low overscan |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7610353A (nl) * | 1976-09-17 | 1978-03-21 | Philips Nv | Werkwijze voor het aanbrengen van referentiepunten voor de magnetische afbuigeenheid van een kleuren- beeldbuis, inrichting voor het uitvoeren van een dergelijke werkwijze en beeldbuis voorzien van refe- rentiepunten volgens de werkwijze of met de inrichting. |
US4456853A (en) * | 1981-07-06 | 1984-06-26 | Tektronix, Inc. | Feedback CRT for use in a closed-loop correction system |
-
1983
- 1983-12-22 DE DE19833346361 patent/DE3346361A1/de not_active Withdrawn
-
1984
- 1984-12-04 DE DE8484114760T patent/DE3471811D1/de not_active Expired
- 1984-12-04 EP EP84114760A patent/EP0146839B1/de not_active Expired
- 1984-12-17 US US06/682,419 patent/US4659957A/en not_active Expired - Fee Related
- 1984-12-17 CA CA000470282A patent/CA1220508A/en not_active Expired
- 1984-12-21 JP JP59268722A patent/JPS60157145A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
EP0146839A1 (de) | 1985-07-03 |
DE3471811D1 (en) | 1988-07-07 |
US4659957A (en) | 1987-04-21 |
JPS60157145A (ja) | 1985-08-17 |
CA1220508A (en) | 1987-04-14 |
DE3346361A1 (de) | 1985-07-04 |
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Owner name: DOTT. ANTONIO SERGI |
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