US3828358A - Exposure apparatus for the direct photographic production of a phosphor screen on the face-plate of a color picture tube - Google Patents

Exposure apparatus for the direct photographic production of a phosphor screen on the face-plate of a color picture tube Download PDF

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Publication number
US3828358A
US3828358A US00415219A US41521973A US3828358A US 3828358 A US3828358 A US 3828358A US 00415219 A US00415219 A US 00415219A US 41521973 A US41521973 A US 41521973A US 3828358 A US3828358 A US 3828358A
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United States
Prior art keywords
light source
borderlines
discontinuous
exposure apparatus
mask
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Expired - Lifetime
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US00415219A
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English (en)
Inventor
S Miyaoka
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Sony Corp
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Sony Corp
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Publication date
Priority claimed from JP11530872A external-priority patent/JPS5544418B2/ja
Priority claimed from JP11530772A external-priority patent/JPS4974953A/ja
Application filed by Sony Corp filed Critical Sony Corp
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Publication of US3828358A publication Critical patent/US3828358A/en
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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
    • H01J9/2273—Auxiliary lenses and filters

Definitions

  • ABSTRACT In an exposure apparatus or lighthouse for use in the direct photographic production of a phosphor screen on the face-plate of a color picture tube or kinescope ofthe type having a mask with apertures therein associated with the phosphor screen, and in which the face-plate and mask are held in predetermined relation to each other during the selective exposure through apertures of the mask of a photosensitive layer on the face-plate by means of light rays passing through a correcting lens from a light source; such light source is linear so that light rays from locations along the light source reach each selectively exposed portion of the photosensitive layer, and the correcting lens, whose. effective surface consists of a plurality of refractive surface sections having discontinuous borderlines, is arranged with such discontinuous borderlines extending at angles to the direction of the linear light source for avoiding the casting of shadows on the photosensitive layer by the discontinuous borderlines.
  • a photosensitive layer for producing the areas of the phosphor screen emitting green, red or blue light is applied to the face-plate and the latter and the mask or grill are then held in predetermined relation to each other on an exposure apparatus or light-house.
  • the photosensitive layer or emulsion on the face-plate is selectively exposed, through the apertures of the associated mask or grill, by means of light rays passing through a lens system from a point source of light which is positioned to correspond to the location of the deflection center of the respective electron'beam in the completed color picture tube.
  • the deflection centers of the three electron beams for respectively exciting the green, red and blue light-emitting areas of the phosphor screen shift in dependence on the angles of deflection of the electron beams during scanning of the phosphor screen. Accordingly, in exposing each photosensitive layer or emulsion in the lighthouse, it is necessary to employ a lens system that includes one or more correcting lenses for bringing thepaths of the light rays used for exposing the photosensitive layer through each aperture of the mask or grill more or less into correspondence with the path of the respective electron beam when passing through that-aperture during operation of the color picture tube.
  • the locations of the areas of the phosphor screen for emitting light of different respective colors, as produced by the direct photographic process, will not precisely correspond to the landing spots of the respective beams on the phosphor screen, particularly at the peripheral portions of the screen, with resulting impairment of the quality of the produced color picture.
  • the discontinuous borderlines or steps are circular so that each surface section or element is continuous in the circumferential direction, and the discontinuities or steps occur in the radial direction of the composite surface.
  • at least one of the refractive surface sections or elements has discontinuous borderlines extending in at least two directions.
  • a correcting lens with an effective surface which is a composite of refractive surface sections or elements having discontinuous borderlines can be relatively easily produced by molding the lens in a mold made up of an assemblage of mold elements which are individually formed with respective surfaces corresponding to the desired shapes of respective surface sections or elements of the correcting lens.
  • an object of this invention to provide an exposure apparatus, as aforesaid, employing a correcting lens whose effective surface is a composite of refractive surface sections or elements having discontinuous borderlines for obtaining optimum correspondence of the light ray-paths with the electron beam-paths over the entire extent of the phosphor screen, and in which the casting of shadows by discontinuous borderlines is simply and effectively eliminated.
  • an exposure apparatus employs a linear light source so that rays from locations along the light source reach each selectively exposed portion of the photosensitive layer or emulsion, and the correcting lens having an effective surface which is a composite of refractive surface elements or sections with discontinuous borderlines is arranged with such discontinuous borderlines extending at angles to the direction of the linear light source.
  • FIG. 1 is a schematic sectional view of an exposure apparatus or lighthouse according to the prior art for use in producing the phosphor screen of a color picture tube or kinescope;
  • FIGS. 2, 3 and 4 are plan views of various correction lenses proposed in the prior art for use in the exposure apparatus of FIG. 1;
  • FIG. 5 is a diagrammatic view to which reference will be made in explaining how shadows are cast on the photosensitive layer being exposed in the apparatus according to the prior art;
  • FIG. 6 is a view similar to that of FIG. I, but showing an exposure apparatus according to this invention.
  • FIG. 7 is a fragmentary perspective view showing the relationship of the essential elements in the exposure apparatus according to this invention.
  • FIG. 8 is a plan view of a correcting lens that may be used in an exposure apparatus according to this invention and showing its relationship to the light source of such apparatus;
  • FIGS. 9 and 10 are sectional views taken along the lines 9-9 and l0l0, respectively, on FIG. 8;
  • FIG. 11 is a view similar to FIG. 8, but showing another correcting lens usable in the exposure apparatus according to this invention.
  • FIG. 12 is a sectional view taken along the line 12--l2 on FIG. 11;
  • FIG. 13 is a view similar to FIG. 8, but showing still another correcting lens usable in the exposure apparatus according to this invention.
  • FIG. 14 is a schematic view illustrating a mold in which a correcting lens usable in the exposure apparatus according to this invention can be economically and conveniently formed.
  • FIG. 15 is a diagrammatic view similar to that of FIG. 5, but illustrating the manner in which the casting of shadows is eliminated in the apparatus according to this invention.
  • FIG. 1 DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • a photosensitive layer or emulsion for providing the areas or phosphor dots of the screen emitting green, red or blue light is applied to the faceplate 20, whereupon such faceplate and the shadow mask 21 are held in predetermined relation to each other on an exposure apparatus or lighthouse 22.
  • the photosensitive layer or emulsion on faceplate 20 is selectively exposed, through the apertures of mask 21, by means of light rays passing through a lens system 23 from a point source of light 24 which is positioned to correspond to the location of the deflection center of the respective electron beam in the completed color picture tube.
  • a point source of light 24 which is positioned to correspond to the location of the deflection center of the respective electron beam in the completed color picture tube.
  • the deflection centers on the three electron beams for respectively exciting the green, red and blue lightemitting phosphor dots of the phosphor screen shift in dependence on the magnetic deflection of the electron beams during scanning of the phosphor screen. Accordingly, in exposing each photosensitive layer or emuslion in the exposure apparatus or lighthouse 22, it is necessary that the lens system 23 of the latter include one or more correcting lenses by which the paths of the light rays used for exposing the photosensitive layer through each aperture of mask 21 are made to more or less correspond with the path of the respective electron beam when passing through that aperture during operation of the color picture tube.
  • the correcting lens is provided with a continuous effective surface having complex curvatures, for example, as indicated at 23a on FIG. 1 and as disclosed in US. Pat. No. 2,885,935, it is very difficult to mold the correcting lens with the necessary complex curvatures of its continuous effective surface and to polish such surface, and, furthermore, a continuous effective surface, even with complex curvatures, cannot achieve the desired correspondence of the light ray-paths with the electron beampaths over the entire extent of the phosphor screen.
  • correcting lenses have been provided with an effective surface which is a composite of a plurality of refractive surface sections or elements formed with independently predetermined curvatures or other configurations and having discontinuous boundries or borderlines, such as steps, between the adjacent sections or elements of the composite surface.
  • an effective surface which is a composite of a plurality of refractive surface sections or elements formed with independently predetermined curvatures or other configurations and having discontinuous boundries or borderlines, such as steps, between the adjacent sections or elements of the composite surface.
  • a correcting lens 25 having an effective surface which is a composite of annular surface sections or elements 25a having discontinuous borderlines or steps 25b therebetween which are concentric circles so that each surface section or element 25a is continuous in the circumferential direction and the discontinuities or steps occur in the radial direction of the composite surface.
  • a correcting lens 26 may have its composite effective surface made up of surface sections or elements 26a having discontinuous borderlines 26b and 26c extending at right angles to each other, or a correcting lens 27 (FIG. 4) may be provided with an effective surface which is a composite of surface sections or elements 27a with discontinuous borderlines 27b and 270 extending irregularly in various directions.
  • defects occur in the produced phosphor screen at the regions of the shadows, and the quality of the color picture produced with the color picture tube or kinescope is impaired.
  • the exposure apparatus or lighthouse 22' is particularly adapted to eliminate the casting of such shadows during the direct photographic production of the phosphor screen for a color picture tube or kinescope of the type in which the phosphor screen is made up of phosphor stripes, rather than dots, and is associated with an aperture grill 21' having elongated apertures or slits 21'a extending parallel to the phosphor strips and through which the electron beams pass for exciting the respective phosphor strips, for example, as disclosed in U.S. Pat. No. 3,573,528, issued Apr. 6, 1971, or U.S. Pat. No. 3,638,063, issued Jan.
  • the exposure apparatus 22 having a support 22'a for holding the faceplate 20' and aperture grill 21' in predetermined relation to each other is further provided with a rectilinear light source 24' having its longitudinal axis X-X (FIG. 7) extending parallel to the elongated apertures or slits 21 'a of the aperture grill, and with a correction lens 29 having an effective surface composed of refractive surface sections or elements 29a with discontinuous borderlines or steps 29b therebetween which extend in the direction Y-Y at an angle to the longitudinal axis X-X of the light source 24'.
  • the several refractive surface sections 29a are shaped to provide the desired corrections of the light ray-paths for correspondence of the latter to the electron beam-paths in the actual color picture tube or kinescope.
  • the correcting lens 29 used in the exposure apparatus 22' may have all of its discontinuous borderlines 29b extending parallel to each other in the direction Y-Y at right angles to the longitudinal axis X-X of the linear light source 24', as shown on FIGS. 7-10.
  • each refractive surface section 29a is continuous in the direction Y-Y at right angles to the longitudinal axis of the linear light source, as is apparent particularly on FIG. 10, and the discontinuities 29b in the composite surface of the correcting lens 29 occur in the direction along the axis of the linear light source, as is apparent on FIG. 9.
  • the correcting lens 129 used in the exposure apparatus 22' may have all of the discontinuous borderlines 1291; between its surface sections or elements 129a extending parallel to each other in the direction Y-Y which is; at an angle other than a right angle in respect to the longitudinal axis of linear light source 24. Still another embodiment is shown on FIG.
  • the correcting lens 229 is there illustrated to have a composite surface made up of refractive surface sections or elements 229a having a first group of parallel discontinuous borderlines 22% extending in the direction Y-Y at an angle to the longitudinal axis X-X of linear light source 24' and a second group of parallel discontinuous borderlines 229a extending in the direction Z-Z which is also at an angle to the longitudinal axis X-X.
  • the longitudinal axis X-X of the linear light source 24' is arranged to substantially bisect the angle between the directions Y-Y and Z-Z of the discontinuous borderlines 22% and 2290, respectively.
  • the correcting lens 29,129 or 229 used in the exposure apparatus 22 according to this invention is advantageous in that it can be conveniently and economically formed with the optimum correction characteristics in the manner disclosed in U.S. Pat. No. 3,628,850.
  • a metal mold 30 for use in producing the correcting lens 29,129 or 229 may consist of an assemblage of mold elements or blocks 31 which have had their upper end surfaces 31a individually shaped to correspond to the necessary configuration of a respective surface section or element 29a,10- 29a or 229a of the correcting lens to be produced.
  • the material of the desired correcting lens for example, a solution of an acrylic resin or the like, is poured onto mold 30. After the resin has set and cured, the resulting correcting lens blank may be suitably polished.
  • the exposure apparatus 22' avoids the casting of shadows of such discontinuous borderlines on the photosensitive layer 20'a during the exposure of the latter.
  • the shadowed region 28" that would be defined between the light rays R and R extending from points C and D, respectively, at opposite ends of linear light source 24' through the discontinuous borderline 29"b, it will be seen that the bundle of light rays between the rays R and R emananting from point C and the bundle of light rays between the rays R and R emanating from point D will all deliver light to such shadowed region through surface sections 29a of the correcting lens surface.
  • the shadows are substantially lightened or eliminated to avoid any interference thereof with the proper exposure of the photosensitve layer 20'a.
  • An exposure apparatus for use in the direct photo graphic production of a phosphor screen on the faceplate of a color picture tube of the type having a mask with apertures therein associated with the phosphor screen; comprising support means for holding the faceplate and mask in predetermined relation to each other.
  • a linear light source positioned for directing rays of light from locations therealong through said apertures of the mask to said face-plate, and correcting lens means disposed between said linear light source and said mask and defining an effective surface consisting of a plurality of refractive surface sections at least some of which have discontinuous borderlines, all of said discontinuous borderlines extending at angles in respect to the direction of said linear light source.
  • discontinuous borderlines include a first group of parallel borderlines and a second group of parallel borderlines at an angle to, and intersecting said borderlines of the first group, and said direction of the rectilinear light source substantially bisects said angle between the discontinuous borderlines of said first and second groups.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
US00415219A 1972-11-17 1973-11-12 Exposure apparatus for the direct photographic production of a phosphor screen on the face-plate of a color picture tube Expired - Lifetime US3828358A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11530872A JPS5544418B2 (nl) 1972-11-17 1972-11-17
JP11530772A JPS4974953A (nl) 1972-11-17 1972-11-17

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US3828358A true US3828358A (en) 1974-08-06

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US (1) US3828358A (nl)
CA (1) CA997189A (nl)
DE (1) DE2356887A1 (nl)
FR (1) FR2207290B1 (nl)
GB (1) GB1448596A (nl)
NL (1) NL7315845A (nl)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936151A (en) * 1972-12-04 1976-02-03 Hitachi, Ltd. Correction lenses utilized to form fluorescent screens of colour picture tubes
US4122461A (en) * 1977-07-11 1978-10-24 Gte Sylvania Incorporated Exposure apparatus and method for manufacturing a cathode ray tube display screen
US4183637A (en) * 1976-11-12 1980-01-15 Hitachi, Ltd. Method and apparatus for forming phosphor screen of color picture tubes
US4187012A (en) * 1977-03-02 1980-02-05 Hitachi, Ltd. Method and apparatus for exposure of phosphor screen
US5122819A (en) * 1989-08-04 1992-06-16 Mitsubishi Denki Kabushiki Kaisha Exposure device for color CRT manufacture and a compound corrective lens therefor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279340A (en) * 1964-03-19 1966-10-18 Rca Corp Art of making color-phosphor mosaic screens
US3628850A (en) * 1970-02-24 1971-12-21 Hitachi Ltd Correcting lens
US3738234A (en) * 1971-05-08 1973-06-12 Philips Corp Exposure device for manufacturing a display screen of a color television picture tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279340A (en) * 1964-03-19 1966-10-18 Rca Corp Art of making color-phosphor mosaic screens
US3628850A (en) * 1970-02-24 1971-12-21 Hitachi Ltd Correcting lens
US3738234A (en) * 1971-05-08 1973-06-12 Philips Corp Exposure device for manufacturing a display screen of a color television picture tube

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936151A (en) * 1972-12-04 1976-02-03 Hitachi, Ltd. Correction lenses utilized to form fluorescent screens of colour picture tubes
US4183637A (en) * 1976-11-12 1980-01-15 Hitachi, Ltd. Method and apparatus for forming phosphor screen of color picture tubes
US4187012A (en) * 1977-03-02 1980-02-05 Hitachi, Ltd. Method and apparatus for exposure of phosphor screen
US4122461A (en) * 1977-07-11 1978-10-24 Gte Sylvania Incorporated Exposure apparatus and method for manufacturing a cathode ray tube display screen
US5122819A (en) * 1989-08-04 1992-06-16 Mitsubishi Denki Kabushiki Kaisha Exposure device for color CRT manufacture and a compound corrective lens therefor

Also Published As

Publication number Publication date
FR2207290B1 (nl) 1979-04-13
CA997189A (en) 1976-09-21
GB1448596A (en) 1976-09-08
DE2356887A1 (de) 1974-05-22
FR2207290A1 (nl) 1974-06-14
NL7315845A (nl) 1974-05-21

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