US3856525A - Method for manufacturing cathode ray tube screen - Google Patents

Method for manufacturing cathode ray tube screen Download PDF

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Publication number
US3856525A
US3856525A US00289445A US28944572A US3856525A US 3856525 A US3856525 A US 3856525A US 00289445 A US00289445 A US 00289445A US 28944572 A US28944572 A US 28944572A US 3856525 A US3856525 A US 3856525A
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Prior art keywords
light
mask
apertures
layer
face plate
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Expired - Lifetime
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US00289445A
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English (en)
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T Inoue
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Sony Corp
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Sony Corp
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    • 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
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H01J9/22—Applying luminescent coatings
    • H01J9/227—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines
    • H01J9/2271—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines by photographic processes
    • H01J9/2272—Devices for carrying out the processes, e.g. light houses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/20—Exposure; Apparatus therefor

Definitions

  • ABSTRACT in producing the phosphor screen of a cathode ray tube, particularly a color picture tube or kinescope, by coating'the surface of a'face plate with a light sensitive layer containing phosphor material and then exposing such layer to light passing through the apertures of a mask from a light source, the position of the light source relative to the face plate is varied during the exposure in a direction which is parallel to a line perpendicular to the face plate at the center of the latter.
  • This invention relates generally to cathode ray tubes, and more particularly is directed to the manufacture of the phosphor screens of color picture tubes or kinescopes.
  • the phosphorscreen of a color picture tube or kinescope is made up of cathodoluminescent phosphors respectively having blue, green andred emissions and being deposited on elemental areas of the surface of the face plate of the tube, which elemental areas are arranged in triads associated with respective apertures of a shadow grid or mask disposed adjacent to the phosphor screen.
  • the shadow grid or mask which will eventually be associated with the phosphor screen in a completed color picture tube or kinescope is used as the optical mask through which each light sensitive layer containing cathodoluminescent phosphor material having emissions of a predetermined color is exposed to light from alight source in a respective fixed position that generally corresponds to'the deflection center of the respective electron beam in the completed color picture tube. After such exposure of each light sensitive layer, the latter is developed so that therespective phosphor material remains permanently only on selected areas of the face plate surface.
  • the apertures of the shadow grid or mask by progressively decreased in size from maximum, dimensions at the center of the phosphor screen to minimum dimensions adjacent the edges of the screen while the corresponding dimensions of the elemental areas of the different color phosphors are substantiallyuniform over the entire extent of the screen in order to ensure that there'will be an adequate tolerance for the correct landing of the electron beams on the respective color phosphors particularly at the edge portions of the screen.
  • the elemental areas of the different color phosphors are provided with uniform sizes over the entire extent of the phosphor screen, even though the apertures of the shadow grid or mask'decrease in size from the center toward the edges of the mask, by varying the intensity of the light to which the central and edge portions of each light sensitive layer are exposed, that is, by employing a light filter between the light source and the mask which varies the intensity of the light passing through the apertures of the mask generally in inverse proportion to the sizes of the apertures.
  • the foregoing conventional method for optically printing the phosphor screen of a color picture tube is disadvantageous in that the elemental areas of the different color phosphors do not have the desired sharp definition, particularly at the edge portions of the screen, and further in that it is necessary to employ a light source having a very large light so that the latter will havea relatively large tolerance for the landing of the electron beams thereon particularly at the edge portions of the screen.
  • Another object is to provide an improved method for optically printing the phosphor screen of a color picture tube, as aforesaid, and by which the elemental areas of the different color phosphors have uniform dimensions and are sharply and precisely defined over the entire area of the screen.
  • Still another object is to provide an improved method for optically printing the phosphor screen of a color picture tube, as aforesaid, and which permits the use of a light source having a relatively low light energy output or relatively shorter exposure times for the exposure of the light sensitive layers.
  • each light sensitive layer coated on the surface of the face plate during the optical printing of the phosphor screen of a color picture tube is exposed to light passing through the apertures of a shadow grid or mask from a light source which,-in the course of such exposure of the layer to the light, is disposed at least at two positions relative to the face plate which are spaced from each other in a direction parallel to a line perpendicular to the face plate at the center of the latter.
  • the at least two positions occupied by the light source during the exposing of each light sensitive layer containing cathodoluminescent phosphor material having emissions of a predetermined respective color are displaced, in a direction parallel to the surface of the face plate, from the at least two positions of the light source used for exposing each of the other light sensitive layers.
  • FIG. I is a schematic view illustrating the optical printing of the phosphorscreen of a color picture tube according to the conventional'met hod heretofore employed;
  • FIG. 2 is a plan view of the shadow grid of a color picture tube which may be employed as a mask during the optical printing method of FIG. 1;
  • FIGS. 3 and 4 are graphical representations of the light energy distributions obtained at the central and edge portions, respectively, of a light sensitive layer during the optical printing of the phosphor screen in accordance with the conventional method;
  • FIG. 5 is a schematic view similar to that of FIG. 1, but illustrating the optical printing method in accordance with an embodiment of the present invention
  • FIGS. 6 and 7 are enlarged, fragmentary schematic sectional views illustrating the manner in which the light sensitive layer is exposed to light at its central and edge portions, respectively, when using the optical printing method according to this invention
  • FIGS. 8 and 9 are graphical representations of the light energy distributions obtained at the central and edge portions of the light sensitive layer when exposed to light in the manner indicated on FIGS. 6 and 7, respectively;
  • FIG. It is a schematic sectional view illustrating an apparatus for the optical printing of the phosphor screen of a color picture tube in accordance with this invention
  • FIG. 11 is a schematic plan view of another form of shadow grid or mask that can be used in a color picture tube having its phosphor screen optically printed in accordance with this invention.
  • FIG. 12 is a graphical representation showing the increase in the size of the elemental area of each phosphor at various locations on the phosphor screen in response to light source movement during the exposure step of the optical printing method in accordance with this invention.
  • the inner surface of face plate 2 is coated with a layer 1 of a light sensitive substance, wuch as polyvinyl alcohol, containing cathodoluminescent phosphor material having emissions of a predetermined color.
  • the layer 1 may be applied as a slurry of the phosphor material in the light sensitive substance, or the light sensitive substance may be first coated on face plate 2 and then, while the light sensitive substance is still moist, the phosphor material may be sprayed thereagainst.
  • An optical mask 3 which is preferably the shadow grid or mask to be associated with the phosphor screen in the completed color picture tube, is positioned adjacent the face plate 2 so that light sensitive layer 1 on the face plate will be exposed to light passing through apertures of the mask 3 from a light source 4.
  • a corrective lens 5 and an optical filter 6 which, as hereinafter described, may be formed to vary the relative intensities of the light to which the light sensitive layer 1 is exposed at its central and edge portions, respectively.
  • the latter is maintained in a fixed position which approximately corresponds to the deflection center of the electron beam produced in the completed color picture tube for energizing the phosphor material in layer 1.
  • layer 1 is suitably developed to harden those areas that have been exposed and to remove the remaining portions of such layer.
  • the foregoing steps are repeated with a second light sensitive layer containing cathodoluminescent phosphor material having emissions of another color, and with the light source 4 being disposed, during exposure of the second light sensitive layer, at a fixed position which is displaced, in a direction parallel to the face plate surface, from the position of the light source used during exposure of the first layer so as to correspond to the deflection center of the electron beam for energizing the phosphor material of the second layer.
  • cathodoluminescent phosphors having different color emissions are deposited on elemental areas of the surface of face plate 2, for example, on dot-like or stripe-like areas of such surface, and which are arranged in triads each corresponding to an aperture of mask 3.
  • the shadow grid 9 associated with such phosphor screen may include upper and lower frame members 7 having parallel, spaced apart grid elements 8 extending therebetween to define parallel elongated apertures 10 between the grid elements.
  • grid mask 9 the widths of the elongated apertures 10 are shown to decrease progressively from a maximum width W at the center of mask 9 to minimum widths W at the opposite sides or edges of the mask.
  • the grid mask 9 having the widths of its elongated apertures 10 varied, as aforesaid, is employed in connection with a phosphor screen having its different color phosphors in stripe-like areas that are of substantially uniform width over the entire extent of the phosphor screen, a desirably large tolerance for the landing ofthe electron beams on the respective stripe-like color phosphors is obtained, particularly at the opposite side or edge portions of the screen.
  • the shadow grid 9 of FIG. 2 is employed as the optical mask 3 during the optical printing of the phosphor screen by the conventional method described above with reference to FIG.
  • the optical filter 6 employed in the conventional optical printing method is designed to substantially diminish the intensity of the light transmitted through the central portion of the filter as compared with the intensity of the light transmitted through the edge portions of the filter.
  • the filter 6 may be formed of a glass or other transparent plate having chromium non-uniformly evaporated or sputtered on a surface thereof so that the resulting layer of evaporated chromium is relatively thick or dense at the central portion of the filter and progressively decreases in thickness or density toward the edges of the filter plate.
  • the light sensitive layer will be hardened over the width S which corresponds to the width of the area at which the respective phosphor material will bepermanently retained upon the threshhold light energy a,,, the limits or edges of the area on which the respective phosphor material will be permanently retained, upon development of the light sensitive layer, are sharply and smoothly defined.
  • the light of relatively high intensity passing through an edge portion of filter 6 and through a relatively narrow aperture in an edge portion of mask 3 provides a light energy distribution on the respective region of the light sensitive layer which is represented by the curve II having a relatively higher maximum value at its center than the curve I, but falling off more quickly at the opposite sides ofthe center of the curve.
  • the slope of the curve II at the level of the threshhold of light energy a is relatively small, as compared'with the steep slope of curve I at the level of the threshhold light energy a,, so that the edges of the areas at which the phosphor material is permanently retained on the edge portions of the face plate are not sharply I defined and, at times, may be wavy or irregular.
  • the present invention avoids the above described disadvantages of the conventional optical method for producing the phosphor screen of a color picturetube or kinescope which is to be associated with a shadow grid or mask having apertures which decrease in size from the central portion to the edge portions of the mask, merely by disposing the light source, during the exposure of each light sensitive layer, at least at two positions relative to the face plate and mask, which positions are spaced from each other in a direction parallel to a line perpendicular to the face plate at the center of the latter.
  • each light sensitive layer 12 coated on the-surface of face plate llll'and having conventional constituents is exposed to light passing through the apertures 13a of the shadow grid or mask 13 after passing through a correction lens 14 and optical filter 15 from a light source 116 which, in the course of the exposing of the layer 12 to light from the source 16, is disposed at least at two positions Z and Z relative to the face plate Ill and mask 13, which two positions Z, and Z, are spaced from each other in the direction Z-Z parallel to a line perpendicular to face plate ll at the center of the latter.
  • each light source 16 in disposing light source In at least at the two positions Z, and 2, relative to face plate 11 and mask l3 during the exposure of each light sensitive layer lll, either the light source 16 can be moved in the direction ZZ while face plate 11 and mask 13 remain stationary, or light source 16 can remain fixed while face plate ll and mask 13 are moved, as a unit, relative to the fixed light source in the direction Z--Z.- Further, the exposure of each light sensitive layer 12 'can be effected in at least two stages during which light source 16 is disposed relative to face plate ll and mask 13 at the positions Z, and Z respectively.
  • the position of light source 16 relative to face plate ll and mask 13 can be changed continuously in the direction 2-2, for example, the light source 16 may be moved continuously from the position Z, through the position 2', to the position 2,.
  • the difference between the exposure widths t, and t is very small, and may even be considered negligible, by reason of the fact that the distance between the light source positions Z, and Z is small when compared with the distances of the light source positions Z, and Z, from the mask 13.
  • the curves III and IV respectively represent the light energy distributions on the region of the light sensitive layer 12 exposed to light passing through a relatively wide aperture at the central portion of mask 113 with the light source l6 disposed at the positions Z, and Z respectively, as on FIG. 6.
  • the light sensitive layer 12 in accordance with the present invention, that is, during the disposition of light source 16 at least at the two positions Z and Z the hardened regions of the light sensitive layer, and hence the phosphor stripes that result upon developing-of the layer, can be given substantially the same width 8,, at the central and edge portions of such layer.
  • the extent to which the movement'of light source 16' from position Z to position Z is effective to increase the width of the area of layer 12 exposed to light passing through a particular aperture of mask 13 will depend upon the extent of the light source movement, that is, the distance between positions Z and Z and also on the distance from the. center of the face plate 11 to the mask aperture being considered.
  • the ordinates represent the ratio of the total width of the area of the light sensitive layer which is exposed to light when the light source is moved between the positions Z and Z relative to the width of the area exposed to light when the light source is disposed at a single position
  • the abscissas represent the distances between the light source positions Z and Z
  • the line a illustrates the described relationship at the center of the face plate
  • the distance through which the light source is moved between the positions Z, and Z in the course of the exposure of the light sensitive layer can be selected to ensure that the resulting phosphor stripes will be ofa uniform, predetermined width over the entire extent of the phosphor screen.
  • the phosphor screen of a color picture tube is optically printed using a grid mask of the type shown on FIG. 2 in which the pitch P between the apertures is 0.75 mm. and the apertures have graduated widths ranging from a maximum width W of 0.13 mm. at the center of the mask to a minimum width W -of 0.09 mm. at the edge portion of the mask.
  • each light sensitive layer is exposed to light therethrough from a light source which, in the course of the exposure, is disposed in two positions Z and Z having a distance of 2.0 mm. therebetween.
  • the resulting phosphor stripes are found to have a uniform width of approximately 0.25 mm. over the entire extent of the face plate.
  • the previously described steps that is, coating the face plate with a light sensitive layer, exposing such layer to a light source while the latter is at least at the two positions Z, and Z and then developing the exposed light sensitive layer, are repeated three times using light sensitive layers respectively containing phosphor materials having red, green and blue emissions.
  • the positions Z and Z of the light source for exposing each of the three light sensitive layers are displaced in directions parallel to the surface of the face plate from the respective positions of the light source for exposing the other light sensitive layers.
  • the light source 16 to be disposed at least at the two positions Z and Z during the exposure of each light sensitive layer is preferably an elongated light source, for examle, an elongated mercury lamp, having its longitudinal axis extending parallel to the longitudinal axes of the apertures in the mask.
  • an alternative form of mask 19 that can be used in producing the phosphor screen of aggregater picture tube in accordance with this invention may include bridging elements 17 which extend across the parallel elongated apertures 18 at spaced apart locations along the latter which are preferably staggered in adjacent apertures for stabilizing, that is, increasing the resistance to vibration of the elements of the shadow grid between which the elongated apertures are defined.
  • the bridging elements will not interfere with the exposure of continuous stripe-like areas of each light sensitive layer so that, upon development of each layer, continuous phosphor stripes will be produced.
  • an apparatus 20 suitable for use in exposing the successive light sensitive layers applied to'the surface of a face plate 22 during the production of the phosphor screen thereon in accordance with this invention includes a housing having clamp devices 23 for securely positioning the face plate 22 and associated shadow grid or mask 21 over an opening in the housing after a light sensitive layer has been applied to the face plate.
  • the corrective lens 27 and the filter 28 which correspond to the elements 14 and referred to in connection with FIG. 5.
  • relative movement of the mounting parts and 26 in the direction of arrow X serves to move light source 24 generally parallel to the surface of face plate 22 so as to dispose the light source either at the position shown in full lines, or in either of the positions shown in broken lines on FIG. 10.
  • Such movement of the light source adapts the apparatus for exposure of the successively applied light sensitive layers intended to form the phosphor strips having green, red and blue emissions.
  • the mounting parts 25 and 26 are moved relative to each other in the direction of the arrow Z, thereby to displace the light source 24 in the direction parallel to a perpendicular to the center of face plate 22, for example, between the positions Z and Z on FIG. 5.
  • a method for producing the phosphor screen of a cathode ray tube comprising the steps of coating the surface of a face plate with a light sensitive layer containing phopshor material, exposing said layer to light passing through apertures of a mask from a light source which, in the course of said exposing of said layer to the light therefrom, isdisposed at least at two positions relative to said face plate, which two positions lie on, and are spaced from each other along a line parallel to a line perpendicular to said face plate at the center of the latter so that the areas of said layer exposed to light from said source through apertures of said mask adjacent the periphery of the latter will be larger relative to the respective apertures than are the areas of said layer exposed to light from said source through apertures of said mask adjacent said center of the latter, and developing said light sensitive layer so that said phosphor material will remain only on selected areas of said surface corresponding to said areas of said layer exposed to light through said apertures.
  • a method of producing the phosphor screen of a color picture tube comprising the steps of coating the surface of a faceplate with a first light sensitive layer containing phosphor material which is cathodoluminescent to have emissions of a predetermined color, positioning a mask adjacent said surface of the faceplate with said mask having elongated apertures which are parallel to each other and with the widths of said apertures being at a maximum adjacent the center of the mask and decreasing progressively toward the edges of said mask in the direction transverse to the longitudinal axes of the apertures, exposing said layer to light passing through said apertures from an elongated light source extending parallel to said longitudinal axes of the apertures, in the course of said exposing of the layer to the light from said source, disposing said source at least at two positions relative to said face plate which two positions lie on, and are spaced from each other along a line parallel to a line perpendicular to said face plate at the center thereof so that the elongated areas of said layer exposed to light from said source through said apertures adjacent

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US00289445A 1971-09-21 1972-09-15 Method for manufacturing cathode ray tube screen Expired - Lifetime US3856525A (en)

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JP46073565A JPS5129635B2 (de) 1971-09-21 1971-09-21

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US (1) US3856525A (de)
JP (1) JPS5129635B2 (de)
CA (1) CA976403A (de)
DE (1) DE2246430C2 (de)
GB (1) GB1365178A (de)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993487A (en) * 1969-01-03 1976-11-23 Matsushita Electronics Corporation Method for manufacture of color television picture tubes using rotating light source
US4001018A (en) * 1973-06-13 1977-01-04 Tokyo Shibaura Electric Co., Ltd. Method for making a stripe screen on a face plate of a cathode ray tube by rotating correction lens
US4013467A (en) * 1971-06-18 1977-03-22 Matsushita Electronics Corporation Method of manufacturing color picture tubes using rotating light attenuator
US4021239A (en) * 1975-05-20 1977-05-03 Sony Corporation Method of exposing parallel stripe-like areas on photosensitive member
US4059834A (en) * 1974-03-13 1977-11-22 Matsushita Electronics Corporation Light exposing apparatus for forming a phosphor screen of a cathode ray tube
US4110760A (en) * 1975-03-27 1978-08-29 U.S. Philips Corporation Method of manufacturing a cathode ray tube for displaying colored pictures
US4132470A (en) * 1976-03-17 1979-01-02 U.S. Philips Corporation Exposure device for the manufacture of display screens of color television display tubes and display tube manufactured by means of such a device
US4157935A (en) * 1977-12-23 1979-06-12 International Business Machines Corporation Method for producing nozzle arrays for ink jet printers
US4245019A (en) * 1978-07-31 1981-01-13 Gte Products Corporation Method for reducing pattern stripes in slotted mask screens for cathode ray tubes
US4300070A (en) * 1978-11-30 1981-11-10 Rca Corporation Cathode-ray tube screen border improvement
US4475797A (en) * 1982-07-30 1984-10-09 Zenith Electronics Corporation Color cathode ray tube screening exposure method and apparatus
US4631440A (en) * 1985-04-29 1986-12-23 North American Philips Consumer Electronics Corp. Color cathode ray tube having smooth screen edges
US4859549A (en) * 1987-03-12 1989-08-22 Sony Corporation Method of forming a fluorescent screen for a color CRT
US5085958A (en) * 1989-08-30 1992-02-04 Samsung Electron Devices Co., Ltd. Manufacturing method of phosphor film of cathode ray tube
US6008577A (en) * 1996-01-18 1999-12-28 Micron Technology, Inc. Flat panel display with magnetic focusing layer
US6320304B1 (en) * 1997-06-24 2001-11-20 Dai Nippon Printing Co., Ltd. Aperture grille having parallel slits with larger cross-sectional area grids at a peripheral portion

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BE793999A (fr) * 1972-01-14 1973-05-02 Rca Corp Procede de fabrication de tubes-images du type a masque pour la television en couleurs
JPS5061180A (de) * 1973-09-28 1975-05-26
JPS51133021A (en) * 1975-05-14 1976-11-18 Fuji Photo Film Co Ltd Photosensitive elements for diffusion transfer
JPS528827A (en) * 1975-07-10 1977-01-24 Fuji Photo Film Co Ltd Photosensitive element for diffusion transfer
JPS554430Y2 (de) * 1975-07-11 1980-02-01
JPS5742963Y2 (de) * 1977-03-25 1982-09-22
JPS5588650U (de) * 1978-12-13 1980-06-19
JPS61250636A (ja) 1985-04-30 1986-11-07 Fuji Photo Film Co Ltd 熱現像感光材料
JPS6234743U (de) * 1985-08-19 1987-02-28
NL190825C (nl) * 1988-11-26 1994-09-01 Samsung Electronic Devices Schaduwmasker voor een kleurenkathodestraalbuis.

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US3667947A (en) * 1967-11-01 1972-06-06 Sylvania Electric Prod Color crt screen exposure method
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US3685994A (en) * 1971-05-05 1972-08-22 Rca Corp Photographic method for printing a screen structure for a cathode-ray tube
US3725106A (en) * 1970-10-30 1973-04-03 Matsushita Electronics Corp Method and apparatus of making color cathode ray tube
US3767395A (en) * 1971-09-13 1973-10-23 Zenith Radio Corp Multiple exposure color tube screening
US3767396A (en) * 1971-09-13 1973-10-23 Zenith Radio Corp Method of screening a color image reproducer

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US3279340A (en) * 1964-03-19 1966-10-18 Rca Corp Art of making color-phosphor mosaic screens
DE1951304A1 (de) * 1968-10-30 1970-05-21 Sanyo Electric Co Farb-Kathodenstrahlroehre
GB1273459A (en) * 1969-10-30 1972-05-10 Matsushita Electronics Corp Method and apparatus for making colour cathode-ray tube

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US3667947A (en) * 1967-11-01 1972-06-06 Sylvania Electric Prod Color crt screen exposure method
US3672893A (en) * 1970-08-03 1972-06-27 Zenith Radio Corp Process of manufacturing screens for shadow-mask tubes
US3725106A (en) * 1970-10-30 1973-04-03 Matsushita Electronics Corp Method and apparatus of making color cathode ray tube
US3685994A (en) * 1971-05-05 1972-08-22 Rca Corp Photographic method for printing a screen structure for a cathode-ray tube
US3767395A (en) * 1971-09-13 1973-10-23 Zenith Radio Corp Multiple exposure color tube screening
US3767396A (en) * 1971-09-13 1973-10-23 Zenith Radio Corp Method of screening a color image reproducer

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993487A (en) * 1969-01-03 1976-11-23 Matsushita Electronics Corporation Method for manufacture of color television picture tubes using rotating light source
US4013467A (en) * 1971-06-18 1977-03-22 Matsushita Electronics Corporation Method of manufacturing color picture tubes using rotating light attenuator
US4001018A (en) * 1973-06-13 1977-01-04 Tokyo Shibaura Electric Co., Ltd. Method for making a stripe screen on a face plate of a cathode ray tube by rotating correction lens
US4059834A (en) * 1974-03-13 1977-11-22 Matsushita Electronics Corporation Light exposing apparatus for forming a phosphor screen of a cathode ray tube
US4110760A (en) * 1975-03-27 1978-08-29 U.S. Philips Corporation Method of manufacturing a cathode ray tube for displaying colored pictures
US4021239A (en) * 1975-05-20 1977-05-03 Sony Corporation Method of exposing parallel stripe-like areas on photosensitive member
US4132470A (en) * 1976-03-17 1979-01-02 U.S. Philips Corporation Exposure device for the manufacture of display screens of color television display tubes and display tube manufactured by means of such a device
US4157935A (en) * 1977-12-23 1979-06-12 International Business Machines Corporation Method for producing nozzle arrays for ink jet printers
US4245019A (en) * 1978-07-31 1981-01-13 Gte Products Corporation Method for reducing pattern stripes in slotted mask screens for cathode ray tubes
US4300070A (en) * 1978-11-30 1981-11-10 Rca Corporation Cathode-ray tube screen border improvement
US4475797A (en) * 1982-07-30 1984-10-09 Zenith Electronics Corporation Color cathode ray tube screening exposure method and apparatus
US4631440A (en) * 1985-04-29 1986-12-23 North American Philips Consumer Electronics Corp. Color cathode ray tube having smooth screen edges
US4859549A (en) * 1987-03-12 1989-08-22 Sony Corporation Method of forming a fluorescent screen for a color CRT
US5085958A (en) * 1989-08-30 1992-02-04 Samsung Electron Devices Co., Ltd. Manufacturing method of phosphor film of cathode ray tube
US6008577A (en) * 1996-01-18 1999-12-28 Micron Technology, Inc. Flat panel display with magnetic focusing layer
US6320304B1 (en) * 1997-06-24 2001-11-20 Dai Nippon Printing Co., Ltd. Aperture grille having parallel slits with larger cross-sectional area grids at a peripheral portion

Also Published As

Publication number Publication date
DE2246430A1 (de) 1973-03-29
JPS5129635B2 (de) 1976-08-26
GB1365178A (en) 1974-08-29
DE2246430C2 (de) 1983-04-07
JPS4839165A (de) 1973-06-08
CA976403A (en) 1975-10-21

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