EP0138264B1 - Farbbildwiedergaberöhre - Google Patents

Farbbildwiedergaberöhre Download PDF

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Publication number
EP0138264B1
EP0138264B1 EP84201404A EP84201404A EP0138264B1 EP 0138264 B1 EP0138264 B1 EP 0138264B1 EP 84201404 A EP84201404 A EP 84201404A EP 84201404 A EP84201404 A EP 84201404A EP 0138264 B1 EP0138264 B1 EP 0138264B1
Authority
EP
European Patent Office
Prior art keywords
field
plates
deflection
plane
formers
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
Application number
EP84201404A
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German (de)
English (en)
French (fr)
Other versions
EP0138264A2 (de
EP0138264A3 (es
Inventor
Jan Gerritsen
Piet Gerard Joseph Barten
Otto Mensies
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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Publication date
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Publication of EP0138264A2 publication Critical patent/EP0138264A2/de
Publication of EP0138264A3 publication Critical patent/EP0138264A3/xx
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Publication of EP0138264B1 publication Critical patent/EP0138264B1/de
Expired legal-status Critical Current

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    • 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
    • H01J29/51—Arrangements for controlling convergence of a plurality of beams by means of electric field only
    • 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
    • H01J29/56—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses
    • 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
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least
    • H01J29/707—Arrangements intimately associated with parts of the gun and co-operating with external magnetic excitation devices

Definitions

  • the invention consists of a color image display tube according to claim 1.
  • a common problem with color display tubes with an “in-line” type electron gun is the so-called image coma.
  • This coma is expressed in the fact that the dimensions of the grids, which describe the two outer electron beams on the screen, differ from those of the central beam. This is caused by the eccentric position of the outer electron beams in relation to the field for the vertical deflection.
  • a large number of patents are mentioned in US Pat. No. 4,196,370, in which partial solutions are specified. These solutions consist of the use of conductive and / or shielding rings and plates which are mounted at the end of the beam generating system and which reinforce or weaken the deflection field or the deflection fields in places along part of the paths of the electron beams.
  • a deflection coil system is known from the published Dutch patent application 7 801 317, in which field-forming means are attached in the deflection coil system. They consist, for example, of two soft magnetic elements which are mounted diametrically opposite one another outside the horizontal deflection coil and essentially transversely to the magnetic field of the vertical deflection coil on the neck side of the deflection coil system.
  • field shaping means A disadvantage of using such field shaping means is that a large part of the vertical deflection field is guided around the beams by these means, which reduces the sensitivity to deflection of the tube / coil system.
  • the older EP-A-0 125 729 describes measures for reducing losses in the second deflection field.
  • the field formers according to EP-A-0 125 729 each consist of at least two adjacent plates which are symmetrical with respect to the plane mentioned by the beam axes and the tube axis. The gaps between the plates are overlapped on the side facing away from the electron beams at a distance from these plates from other plates, so that magnetic shunts are created for the second deflection field in each field former.
  • the invention has for its object to provide a color display tube, in which the losses in the second deflection field are reduced by the field former, that the second deflection field is almost not deformed and the desired cushion distortion of the first deflection field is further increased in the field former.
  • each field former is provided at its end facing from the plane mentioned with angled substantially flat plates which extend in the direction of the central electron beam, in which case the gaps between the plates are overlapped by shunt plates, the shunt plates are located on the side facing away from the electron beams at a distance from the plates separated by the gaps.
  • the plates of each field former are separated by a gap, which gap on the elec Tron rays facing side of the field former at a distance from the plates is covered by a shunt plate.
  • the invention is based on the knowledge that the attachment to the middle . Electron beam-extending, angled plates, the first deflection field (the vertical field) is guided further to the central beam, whereby this field becomes pillow-shaped. Through these radially directed plates, part of the second deflection field (the horizontal field), which is otherwise guided around the beams via the tangentially arranged plates (which lie next to one another and symmetrically with respect to the plane mentioned), is further guided to the beams whereby this field is enhanced at the position of the electron beams with respect to the state without the radially directed plates (EP-A-0 109 717 and EP-A-0 125 729).
  • An advantage of the partially larger pillow shape of the first deflection field is that the desired coma correction is increased, as a result of which the length of the field shapers in the direction of propagation of the central electron beam is smaller than the length of the field shapers according to the mentioned EP-A-0 109 717 and EP-A- 0 125 729.
  • This shorter length of the field formers means that less energy loss occurs in the second deflection field.
  • the tangential parts of the field formers can also have shorter lengths in comparison to the field formers according to EP-A-0 109 717, as a result of which less loss occurs in the second deflection field (the horizontal field).
  • a preferred first embodiment of the field former for an image display tube according to the invention is characterized in that each field former contains four plates which are adjacent to one another and are symmetrical with respect to the plane mentioned and are separated by three columns.
  • the attenuation of the second deflection field at the location of the rays is reduced; with a correct dimensioning of the gaps it can be achieved that the field at the location of the electron beams is almost homogeneous.
  • a second preferred embodiment of the field formers for a tube according to the invention is characterized in that the gap intersecting the plane is wider than the column above and below the plane. The widening of the gap intersecting the plane ensures that the second deflection field becomes more homogeneous at the location of the beams.
  • a third preferred embodiment of the field formers for a tube according to the invention is characterized in that, in addition, the plates which are closest to the plane mentioned are provided at their end facing away from the plane with angled flat plates which point in the direction of the central electron beam extend. By attaching these additional plates, the shape of the first deflection field is made pillow-shaped at the location of the electron beams.
  • a fourth preferred embodiment of the field formers for an image display tube according to the invention is characterized in that the electron beam generating system is equipped at its end with a centering cup, the plates lying side by side and symmetrically with respect to the plane mentioned being attached to the inner wall or outer wall of this centering cup. In this way it is possible to easily attach the field formers to the electron gun. If the adjacent plates are attached to the outer wall of the centering cup, the centering cup must be provided with slots through which the angled plates extend in the direction of the central electron beam. By partially placing the plates inside and outside the centering cup, the influence of the gaps on the second deflection field (the horizontal field) can be changed.
  • a fifth preferred embodiment of the field formers for a picture tube according to the invention is characterized in that at least one of the gaps between the plates on the side facing away from the electron beams is overlapped at a distance from the plates by shunt plates.
  • the shunt plates provide magnetic resistance in the field formers, with the field being less distorted.
  • FIG. 1 shows a color image display tube of the "in-line ..” type in longitudinal section.
  • a glass bulb 1 which is composed of an image window 2, a cone 3 and a neck 4, an electron beam generation system 5 is accommodated in this neck 4, which has three electron beams 6, 7 and 8 lying with their axes in one plane (the drawing plane) generated.
  • the axis of the central electron beam 7 coincides with the tube axis 9 before the deflection.
  • the image window 2 is provided on the inside with a large number of tripein from phosphor lines.
  • Each triple contains a line of blue fluorescent, a line of green fluorescent, and a line of red fluorescent. All triples together form the screen 10.
  • the fluorescent lines run perpendicular to the plane of the drawing.
  • a perforated mask 11 is arranged in front of the screen, in which a large number of elongated openings 12 are provided, through which the electron beams 6, 7 and 8 pass, which each hit only fluorescent lines of a single color.
  • the three electron beams 6, 7, 8 lying in one plane are deflected by a deflection coil system 13.
  • a vertical coma correction is carried out on the beams without any distortion of the impact area of the outer electron beams and with almost no loss of deflection energy of the horizontal field, as will be explained in more detail below with reference to the figures.
  • FIG. 2 shows a broken away view of the electron gun 5. It consists of three separate electron guns 14, 15 and 16. However, it is also possible to apply the invention to a so-called integrated electron gun, as described for example in US Pat. No. 4,196,370, in which the electron gun has a number of electrodes have in common.
  • the beam generators 14, 15 and 16 each contain a control electrode 17 with an opening 18. A cathode (not visible here) for generating the electron beams is mounted in this control electrode opposite this opening.
  • Each beam generator also contains a second grating 19, a third grating 20 and a fourth grating 21.
  • the grids 17, 19 and 20 are fastened to glass rods 23 by means of metal strips 22.
  • the grids 21 are attached to the bottom of a common centering cup 24 made of non-ferromagnetic material.
  • the bottom 25 of the centering cup 24 broken open here is provided with three openings 26 through which the electron beams pass.
  • Attached to the inner wall of the centering cup 24 are two field formers 27 and 28, each consisting of four curved plates 29, 30, 31 and 32, the plates 29 and 32 being provided with bends 33 which extend to the central electron beam.
  • the bends 33 can be attached to the plates 29 and 32 or form a whole with them.
  • the bends 33 can also be slightly curved or angled in themselves. All plates are made of ferromagnetic material with a thickness of 0.25 mm (e.g. an alloy with 58% by weight nickel and 42% by weight iron).
  • the plates have a length of approximately 10 mm, measured in the direction of propagation of the electron beams. Between the plates 29 and 30 and the plates 31 and 32 there are 0.5 mm wide gaps 34. Between the plates 30 and 31, a 1 mm wide column 35 is attached. The diameter of the centering cup 24 is approximately 22 mm. The width of the plates 30 and 31 is 2.8 mm in the flat state. The width of the plates 29 and 32 is 3.7 mm in the flat state and the width of the bends 33 is 3.7 mm. If there is a magnetized multipole ring for the static in the display tube Convergence of the electron beams is used, as described for example in US Pat. No. 4,220,897, it is preferably attached to the bottom 25 of the centering cup 24. The field formers are preferably attached at least 22 mm from this ring in connection with the magnetization of the multipole ring.
  • FIG. 3 in which the same reference numerals are used as in FIG. 2, shows a cross section through the centering cup 24 in FIG. 2.
  • the field formers 27 and 28 are symmetrical with respect to the plane 36 through the beam axes (the plane of the drawing according to FIG. 1) and symmetrical with respect to the tube axis 9, which coincides with the axis of the central electron beam 7 before the deflection.
  • a part of the plates can also lie outside the centering cup. It is also possible not to use a centering cup and to fasten the field formers together, for example with glass beads.
  • the magnetic field As shown schematically in FIG. 4a, the magnetic field, of which some field lines 40 are indicated, is attracted by the known rings 41 around the outer electron beams 42 and 43.
  • the resulting field strength curve B x in the plane through the bundle axes (44, 45, 46) is shown in Fig. 4b with a solid line.
  • the desired coma-free field is indicated by a dashed line.
  • the field does not have the correct field strength profile, as a result of which a four-pole lens effect (four-pole field lines 47) shown in FIG. 4c is exerted on the rays, which is expressed in a deflection defocusing of the side beams.
  • the radial arrows in Fig. 4c indicate the forces that affect the rays.
  • the impact spots on the screen shown in FIG. 4d become elliptical and are surrounded by a fog.
  • the axes of the ellipses in FIG. 4d form an angle of 45 ° with line 37.
  • the elliptical shape of the impact spot is the result of underfocusing.
  • the dashed fog areas 48 are the result of overfocusing.
  • 5a, b, c and d the effect of the field formers, as described in the already mentioned EP-A-0 109717, is explained in more detail.
  • 5a shows a part of the vertical field (the first deflection field), of which some field lines 50 are shown.
  • two field formers 51 and 52 are arranged at the end of the beam generator and distort the vertical field in the manner of a pillow in the desired manner.
  • This pillow-shaped field essentially consists of a two-pole field with a six-pole component.
  • FIG. 6a shows a part of the vertical field, analogous to FIG. 5a, of which some field lines 60 are shown.
  • two curved field formers 61 and 62 are again arranged, each consisting of two curved plates 63, 64 or 65, 66 lying next to one another and symmetrically with respect to the plane mentioned, and each consisting of two curved plates 69 overlapping the columns 67 and 68 and 70 exist.
  • plates 69 and 79 can also be flat. From Fig. 5b analogous to Fig. 6b it can be seen that the vertical field profile has not changed much by the arrangement of the plates 69 and 70 with respect to the vertical field profile according to Fig. 6a.
  • FIG. 6c shows a part of the horizontal field, of which some field lines 71 are shown. From FIG. 5d analogous to FIG. 6d it can be seen that the horizontal field is weakened by the arrangement of the gaps 67 and 68, but also that the course in the x direction is relatively flat; in other words, the horizontal field is less distorted compared to FIG. 5d. This can also be seen from the comparison of FIGS. 5c and 6c.
  • 7a, b, c and d explain the effect of the field formers for a color image display tube according to the invention as shown in FIG. 2.
  • 7a shows, analogous to FIGS. 5a and 6a, part of the vertical field, of which some field lines 80 are shown.
  • two field formers 81 and 82 are arranged in the manner shown in FIG. 2.
  • Each field former consists of four side by side curved plates 83, 84, 85 and 86, which are separated by columns 87, 88 and 89. Bends 90 extend from the ends of plates 83 and 86 toward the center electron beam 55.
  • FIG. 7b which is analogous to FIGS. 5b and 6b, that the field shape is substantially more pillow-shaped due to the bends 90.
  • the field formers 81 and 82 can therefore be shorter, measured in the direction of propagation of the central electron beam. By shortening the field formers, there is even less loss in the horizontal field.
  • FIG. 7c shows a part of the horizontal field, of which some field lines 91 are shown. From FIG. 6d, which is analogous to FIG. 6d, it can be seen that the horizontal field is weakened less by the bends 90 than in the state according to FIGS. 6c and d, while the course in the x direction is also flatter than in FIG. 6d. This can also be seen from the comparison of FIGS. 6c and 7c.
  • FIG. 8 shows another embodiment of the field shaper for an image display tube according to the invention in a cross section analogous to FIG. 3.
  • the plates 30 and 31 of the adjacent plates 29, 30, 31 and 32 are arranged on the outside of the centering cup 24. This different position of the plates and the gaps 34 can influence the shape of the horizontal field (the second deflection field).
  • the plates 29, 30, 31 and 32, which together form the curved field formers 27 and 28, can also be flat. If the plates 29 and 32 are also arranged on the outside of the centering cup 24, slots must be provided in the centering cup 24 through which the bends 33 can extend into the centering cup.
  • FIG. 9 shows another embodiment of the field shaper for an image display tube according to the invention in a cross section analogous to FIG. 3.
  • the reference numbers in this figure are again the same as in FIG. 3.
  • the gaps 35 are overlapped by plates 90 according to EP-A-0 125 729 on the side facing away from the electron beams.
  • the shape of the horizontal field (the second deflection field) can be influenced. It is also possible to overlap column 34 in this way.
  • FIG. 10a shows a part of the vertical field, analogous to FIG. 7a, of which some field lines 100 are shown.
  • Two field formers 101 and 102 are arranged in this field.
  • FIG. 7a shows that these are field formers for a so-called mini neck tube with a neck diameter of approximately 22.5 mm and a mutual beam spacing of 4.4 mm, and the plates 103 which are closest to of the plane mentioned, are provided at their end facing away from the plane through the beam axes with angled flat plates 104 which, like the bends 105, extend inwards towards the central electron beam.
  • the field lines 106 are additionally pulled outwards by the plates 104, as a result of which an even better pillow-shaped field is obtained.
  • the bent plates are arranged on the wall of a centering cup with an inner diameter of 14.8 mm (not shown here). The dimensions of the plates can be derived to scale from FIG. 10a.
  • the vertical field course is strongly pillow-shaped.
  • the field formers 101 and 102 can be shorter in the direction perpendicular to the drawing plane of FIG. 10a than field formers without the angled plates 104 and 105. This shortening again results in lower horizontal field losses.
  • FIG. 10c shows a part of the horizontal field, some field lines 107 of which are shown. From Fig. 10c and that of Fig. 7d analogous to Fig. 10d it can be seen that the horizontal field is only slightly weakened by the angled plates 105 and 104 and the gaps between the plates and almost not distorted at the location of the electron beams.
  • the invention consists of a color image display tube according to claim 1.
  • a common problem with color display tubes with an “in-line” type electron gun is the so-called image coma.
  • This coma is expressed in the fact that the dimensions of the grids, which describe the two outer electron beams on the screen, differ from those of the central beam. This is caused by the eccentric position of the outer electron beams in relation to the field for the vertical deflection.
  • a large number of patents are mentioned in US Pat. No. 4,196,370, in which partial solutions are specified. These solutions consist of the use of a magnetic field of conductive and / or shielding rings and plates which are mounted at the end of the beam generating system and which reinforce or weaken the deflection field or the deflection fields in places along part of the path of the electron beams.
  • a deflection coil system is known from the published Dutch patent application 7 801 317, in which field-forming means are attached in the deflection coil system. They consist, for example, of two soft magnetic elements which are mounted diametrically opposite one another outside the horizontal deflection coil and essentially transversely to the magnetic field of the vertical deflection coil on the neck side of the deflection coil system.
  • field shaping means A disadvantage of using such field shaping means is that a large part of the vertical deflection field is guided around the beams by these means, which reduces the sensitivity to deflection of the tube / coil system.
  • the older EP-A-0 125 729 describes measures for reducing losses in the second deflection field.
  • the field formers according to EP-A-0 125 729 each consist of at least two adjacent plates which are symmetrical with respect to the plane mentioned by the beam axes and the tube axis. The gaps between the plates are overlapped on the side facing away from the electron beams at a distance from these plates from other plates, so that magnetic shunts are created for the second deflection field in each field former.
  • the invention has for its object to provide a color display tube, in which the losses in the second deflection field are reduced by the field shaper, the second deflection field is almost not deformed and the desired cushion distortion of the first deflection field in the field shaper is further increased.
  • each field former is provided, at least at its end facing away from the plane mentioned, with angled substantially flat plates which extend in the direction of the central electron beam.
  • the invention is based on the finding that by attaching the angled plates which extend to the central electron beam, the first deflection field (the vertical field) is guided further to the central beam, as a result of which this field becomes pillow-shaped.
  • part of the second deflection field (the horizontal field)
  • the tangentially arranged plates which lie next to one another and symmetrically with respect to the plane mentioned
  • EP-A-0 109 717 and EP-A-0 125 729 is further guided to the beams , which strengthens this field at the location of the electron beams with respect to the state without the radially directed plates.
  • An advantage of the larger pillow shape of the first deflection field in places is that the desired coma correction is increased, as a result of which the length of the field shapers in the direction of propagation of the central electron beam can be smaller than the length of the field shapers according to the aforementioned EP-A-0 109 717 and EP-A-0 125 729. Due to this shorter length of the field shapers less energy loss occurs in the second deflection field, and the tangential parts of the field formers can also have shorter lengths in the comparison h to form the field former according to EP-A-0 109 717, whereby less loss occurs in the second deflection field (the horizontal field).
  • a preferred first embodiment of the field former for an image display tube according to the invention is characterized in that each field former contains four plates which are adjacent to one another and are symmetrical with respect to the plane mentioned and are separated by three columns.
  • the attenuation of the second deflection field at the location of the rays is reduced; with a correct dimensioning of the gaps it can be achieved that the field at the location of the electron beams is almost homogeneous.
  • a second preferred embodiment of the field formers for a tube according to the invention is characterized in that the gap intersecting the plane is wider than the column above and below the plane. The widening of the gap intersecting the plane ensures that the second deflection field becomes more homogeneous at the location of the beams.
  • a third preferred embodiment of the field formers for a tube according to the invention is characterized in that, in addition, the plates which are closest to the plane mentioned are provided at their end facing away from the plane with angled flat plates which point in the direction of the central electron beam extend. By attaching these additional plates, the shape of the first deflection field is made pillow-shaped at the location of the electron beams.
  • a fourth preferred embodiment of the field formers for an image display tube according to the invention is characterized in that the electron beam generating system is equipped at its end with a centering cup, the plates lying side by side and symmetrically with respect to the plane mentioned being attached to the inner wall or outer wall of this centering cup. In this way it is possible to easily attach the field formers to the electron gun. If the adjacent plates are attached to the outer wall of the centering cup, the centering cup must be provided with slots through which the angled plates extend in the direction of the central electron beam. By partially placing the plates inside and outside the centering cup, the influence of the gaps on the second deflection field (the horizontal field) can be changed.
  • a fifth preferred embodiment of the field formers for a picture tube according to the invention is characterized in that at least one of the gaps between the plates on the side facing away from the electron beams is overlapped at a distance from the plates by shunt plates.
  • the shunt plates provide magnetic resistance in the field formers, with the field being less distorted.
  • FIG. 1 shows a color image display tube of the "in-line" type in longitudinal section.
  • a glass bulb 1 which is composed of an image window 2, a cone 3 and a neck 4
  • an electron beam generation system 5 is accommodated in this neck 4, which has three electron beams 6, 7 and 8 lying with their axes in one plane (the drawing plane) generated.
  • the axis of the central electron beam 7 ′ coincides with the tube axis 9 before the deflection.
  • the image window 2 is provided on the inside with a large number of triples made of phosphor lines. Each triple contains a line of blue fluorescent, a line of green fluorescent, and a line of red fluorescent. All triples together form the screen 10.
  • the fluorescent lines run perpendicular to the plane of the drawing.
  • a perforated mask 11 is arranged in front of the screen, in which a large number of elongated openings 12 are provided, through which the electron beams 6, 7 and 8 pass, which each hit only fluorescent lines of a single color.
  • the three electron beams 6, 7, 8 lying in one plane are deflected by a deflection coil system 13.
  • a vertical coma correction is carried out on the beams without any distortion of the impact area of the outer electron beams and with almost no loss of deflection energy of the horizontal field, as will be explained in more detail below with reference to the figures.
  • FIG. 2 shows a broken away view of the electron gun 5. It consists of three separate electron guns 14, 15 and 16. However, it is also possible to apply the invention to a so-called integrated electron gun, as described for example in US Pat. No. 4,196,370, in which the electron gun has a number of electrodes have in common.
  • the beam generators 14, 15 and 16 each contain a control electrode 17 with an opening 18. A cathode (not visible here) for generating the electron beams is mounted in this control electrode opposite this opening.
  • Each beam generator also contains a second grating 19, a third grating 20 and a fourth grating 21.
  • the grids 17, 19 and 20 are fastened to glass rods 23 by means of metal strips 22.
  • the grids 21 are attached to the bottom of a common centering cup 24 made of non-ferromagnetic material.
  • the bottom 25 of the centering cup 24 broken open here is provided with three openings 26 through which the electron beams pass.
  • Attached to the inner wall of the centering cup 24 are two field formers 27 and 28, each consisting of four curved plates 29, 30, 31 and 32, the plates 29 and 32 being provided with bends 33 extending towards the central electron beam.
  • the bends 33 can be attached to the plates 29 and 32 or form a whole with them.
  • the bends 33 can also be slightly curved or angled in themselves. All plates are made of ferromagnetic material with a thickness of 0.25 mm (e.g. from an alloy with 58% by weight nickel and 42% by weight iron).
  • the plates have a length of approximately 10 mm, measured in the direction of propagation of the electron beams. Between the plates 29 and 30 and the plates 31 and 32 there are 0.5 mm wide gaps 34. Between the plates 30 and 31 a 1 mm wide column 35 is attached. The diameter of the centering cup 24 is approximately 22 mm. The width of the plates 30 and 31 is 2.8 mm in the flat state. The width of the plates 29 and 32 is 3.7 mm in the flat state and the width of the bends 33 is 3.7 mm. If a magnetized multipole ring is used in the image display tube for the static convergence of the electron beams, as described, for example, in US Pat. No. 4,220,897, it is preferably attached to the bottom 25 of the centering cup 24. The field formers are preferably attached at least 22 mm from this ring in connection with the magnetization of the multipole ring.
  • FIG. 3 in which the same reference numerals are used as in FIG. 2, shows a cross section through the centering cup 24 in FIG. 2.
  • the field formers 27 and 28 are symmetrical with respect to the plane 36 through the beam axes (the plane of the drawing according to FIG. 1) and symmetrical with respect to the tube axis 9, which coincides with the axis of the central electron beam 7 before the deflection.
  • a part of the plates can also lie outside the centering cup. It is also possible not to use a centering cup and to fasten the field formers together, for example with glass beads.
  • the magnetic field As shown schematically in FIG. 4a, the magnetic field, of which some field lines 40 are indicated, is attracted by the known rings 41 around the outer electron beams 42 and 43.
  • the resultant field strength curve B. in the plane through the bundle axes (44, 45, 46) is shown in Fig. 4b with a solid line.
  • the desired coma-free field is indicated by a dashed line.
  • the field does not have the correct field strength profile, as a result of which a four-pole lens effect (four-pole field lines 47) shown in FIG. 4c is exerted on the rays which are in an Ab steering defocusing of the side bundles is expressed.
  • the radial arrows in Fig. 4c indicate the forces that affect the rays.
  • the impact spots on the screen shown in FIG. 4d become elliptical and are surrounded by a fog.
  • the axes of the ellipses in FIG. 4d form an angle of 45 ° with the line 37.
  • the elliptical shape of the opening spots is the result of underfocusing.
  • the dashed fog areas 48 are the result of overfocusing.
  • 5a shows a part of the vertical field (the first deflection field), of which some field lines 50 are shown.
  • two field formers 51 and 52 are arranged at the end of the beam generator and distort the vertical field in the manner of a pillow in the desired manner.
  • This pillow-shaped field essentially consists of a two-pole field with a six-pole component.
  • FIG. 5 b shows the course of the magnetic field B x , the vertical field, divided by the vertical field B supplied by the deflection coils, depending on the position x on the axis 53.
  • FIG. 5c shows part of the horizontal field (the second deflection field), of which some field lines 57 are shown.
  • 5d shows the course of the magnetic field
  • FIG. 6a shows a part of the vertical field, analogous to FIG. 5a, of which some field lines 60 are shown.
  • two field formers 61 and 62 are again arranged, each consisting of two curved plates 63, 64 and 65, 66 lying next to one another and symmetrically with respect to the plane mentioned, and of two curved plates 69 and 66 overlapping the gaps 67 and 68 70 exist.
  • plates 69 and 79 can also be flat. From Fig. 5b analogous to Fig. 6b it can be seen that the vertical field profile has not changed much by the arrangement of the plates 69 and 70 with respect to the vertical field profile according to Fig. 6a.
  • FIG. 6c shows a part of the horizontal field, of which some field lines 71 are shown. From FIG. 5d analogous to FIG. 6d it can be seen that the horizontal field is weakened by the arrangement of the gaps 67 and 68, but also that the course in the x direction is relatively flat; in other words, the horizontal field is less distorted compared to FIG. 5d. This can also be seen from the comparison of FIGS. 5c and 6c.
  • 7a, b, c and d explain the effect of the field formers for a color image display tube according to the invention as shown in FIG. 2.
  • 7a shows, analogous to FIGS. 5a and 6a, part of the vertical field, of which some field lines 80 are shown.
  • two field formers 81 and 82 are arranged in the manner shown in FIG. 2.
  • Each field former consists of four adjacent curved plates 83, 84, 85 and 86, which are separated from one another by columns 87, 88 and 89. Bends 90 extend from the ends of plates 83 and 86 toward the center electron beam 55.
  • FIG. 7b which is analogous to FIGS. 5b and 6b, that the field shape is substantially more pillow-shaped due to the bends 90.
  • the field formers 81 and 82 can therefore be shorter, measured in the direction of propagation of the central electron beam. By shortening the field formers, there is even less loss in the horizontal field.
  • FIG. 7c shows a part of the horizontal field, of which some field lines 91 are shown. From FIG. 6d, which is analogous to FIG. 6d, it can be seen that the horizontal field is weakened less by the bends 90 than in the state according to FIGS. 6c and d, while the course in the x direction is also flatter than in FIG. 6d. This can also be seen from the comparison of FIGS. 6c and 7c.
  • FIG. 8 shows another embodiment of the field shaper for an image display tube according to the invention in a cross section analogous to FIG. 3.
  • the reference numerals in this figure are the same as those in FIG. 3 for the sake of clarity.
  • the plates 30 and 31 of the plates 29, 30, 31 and 32 lying next to one another and symmetrically with respect to the plane mentioned are arranged on the outside of the centering cup 24. This different position of the plates and the gaps 34 can influence the shape of the horizontal field (the second deflection field).
  • the plates 29, 30, 31 and 32, which together form the curved field formers 27 and 28, can also be flat. If the plates 29 and 32 are also arranged on the outside of the centering cup 24, slots must be provided in the centering cup 24 through which the bends 33 can extend into the centering cup.
  • FIG. 9 shows another embodiment of the field shaper for an image display tube according to the invention in a cross section analogous to FIG. 3.
  • Columns 35 are in this Embodiment overlapped by plates 90 according to EP-A-0 125 729 on the side facing away from the electron beams. In this way, the shape of the horizontal field (the second deflection field) can be influenced. It is also possible to overlap column 34 in this way.
  • FIG. 10a shows a part of the vertical field, analogous to FIG. 7a, of which some field lines 100 are shown.
  • Two field formers 101 and 102 are arranged in this field.
  • FIG. 7a shows that these are field formers for a so-called mini neck tube with a neck diameter of approximately 22.5 mm and a mutual beam spacing of 4.4 mm, and the plates 103 which are closest to of the plane mentioned, are provided at their end facing away from the plane through the beam axes with angled flat plates 104 which, like the bends 105, extend inwards towards the central electron beam.
  • the field lines 106 are additionally pulled outwards by the plates 104, as a result of which an even better pillow-shaped field is obtained.
  • the bent plates are arranged on the wall of a centering cup with an inner diameter of 14.8 mm (not shown here). The dimensions of the plates can be derived to scale from FIG. 10a.
  • the vertical field course is strongly pillow-shaped.
  • the field formers 101 and 102 can be shorter in the direction perpendicular to the drawing plane of FIG. 10a than field formers without the angled plates 104 and 105. This shortening again results in lower horizontal field losses.
  • FIG. 10c shows a part of the horizontal field, some field lines 107 of which are shown. From Fig. 10c and that of Fig. 7d analogous to Fig. 10d it can be seen that the horizontal field is only slightly weakened by the angled plates 105 and 104 and the gaps between the plates and almost not distorted at the location of the electron beams.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
EP84201404A 1983-10-06 1984-10-03 Farbbildwiedergaberöhre Expired EP0138264B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8303423A NL8303423A (nl) 1983-10-06 1983-10-06 Kleurenbeeldbuis.
NL8303423 1983-10-06

Publications (3)

Publication Number Publication Date
EP0138264A2 EP0138264A2 (de) 1985-04-24
EP0138264A3 EP0138264A3 (es) 1985-06-12
EP0138264B1 true EP0138264B1 (de) 1989-07-05

Family

ID=19842503

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84201404A Expired EP0138264B1 (de) 1983-10-06 1984-10-03 Farbbildwiedergaberöhre

Country Status (10)

Country Link
US (1) US4625145A (es)
EP (1) EP0138264B1 (es)
JP (1) JPS6097533A (es)
KR (1) KR920000914B1 (es)
CA (1) CA1218405A (es)
DD (1) DD232786A5 (es)
DE (1) DE3478886D1 (es)
ES (1) ES8507291A1 (es)
NL (1) NL8303423A (es)
PL (1) PL249935A1 (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8402303A (nl) * 1984-07-20 1986-02-17 Philips Nv Kleurenbeeldbuis.
NL8802194A (nl) * 1988-09-06 1990-04-02 Philips Nv Coma-gecorrigeerd beeldweergeefsysteem.
DE69602714T2 (de) * 1995-08-18 1999-12-02 Koninkl Philips Electronics Nv Farbkathodenstrahlröhre mit zentrierhülse
JP2001135259A (ja) * 1999-11-02 2001-05-18 Matsushita Electronics Industry Corp カラー陰極線管、カラー陰極線管装置
EP1489641B1 (en) * 2003-06-18 2019-08-14 ICT Integrated Circuit Testing Gesellschaft für Halbleiterprüftechnik mbH Charged particle deflecting system

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4833529B1 (es) * 1968-12-30 1973-10-15
JPS5126208B1 (es) * 1971-05-18 1976-08-05
JPS53147436A (en) * 1977-05-27 1978-12-22 Mitsubishi Electric Corp Color receiving tube
NL7707476A (nl) * 1977-07-06 1979-01-09 Philips Nv Werkwijze voor het vervaardigen van een kleuren- beeldbuis en kleurenbeeldbuis vervaardigd vol- gens die werkwijze.
NL188484C (nl) * 1978-02-06 1992-07-01 Philips Nv Afbuigjuk voor kleurentelevisiebeeldweergeefbuizen.
US4196370A (en) * 1978-02-24 1980-04-01 Rca Corporation CRT generating three inline beams and having shunts for weakening center beam horizontal magnetic deflection and strengthening vertical deflection
US4225804A (en) * 1978-04-22 1980-09-30 Gte Sylvania N.V. Cathode ray tube coma correction device
JPS5738544A (en) * 1980-08-19 1982-03-03 Matsushita Electronics Corp Electromagnetic deflection system picture tube system equipment
JPS5819452B2 (ja) * 1980-09-24 1983-04-18 株式会社 石川時鉄工所 屋根瓦の自動生産ラインシステム
DE3123301C2 (de) * 1981-06-12 1985-08-08 Standard Elektrik Lorenz Ag, 7000 Stuttgart Vorrichtung zum Einstellen von Elektronenstrahlen einer Kathodenstrahlröhre
DE3126344A1 (de) * 1981-07-03 1983-02-24 Anton Dr. 7900 Ulm Casel Ablenkeinheit fuer eine dreistrahlige farbfernseh-bildroehre
NL8204465A (nl) * 1982-11-18 1984-06-18 Philips Nv Kleurenbeeldbuis.

Also Published As

Publication number Publication date
DE3478886D1 (en) 1989-08-10
ES536478A0 (es) 1985-08-16
CA1218405A (en) 1987-02-24
DD232786A5 (de) 1986-02-05
JPS6097533A (ja) 1985-05-31
EP0138264A2 (de) 1985-04-24
NL8303423A (nl) 1985-05-01
EP0138264A3 (es) 1985-06-12
KR850003473A (ko) 1985-06-17
PL249935A1 (en) 1985-06-18
US4625145A (en) 1986-11-25
KR920000914B1 (ko) 1992-01-31
ES8507291A1 (es) 1985-08-16

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