US3592112A - Photographic printing of cathode-ray tube screen structure - Google Patents

Photographic printing of cathode-ray tube screen structure Download PDF

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Publication number
US3592112A
US3592112A US844852A US3592112DA US3592112A US 3592112 A US3592112 A US 3592112A US 844852 A US844852 A US 844852A US 3592112D A US3592112D A US 3592112DA US 3592112 A US3592112 A US 3592112A
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light
particles
filter
light field
coating
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US844852A
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Harry Robert Frey
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RCA Licensing Corp
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RCA Corp
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Assigned to RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE reassignment RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RCA CORPORATION, A CORP. OF DE
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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
    • 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

Definitions

  • the filter is a relief image corn prised of preformed, nonmetallic, light-absorbing particles having a mean diameter in the range of 5 to S0 millimicrons in a light-transmitting binder.
  • the filter has variations in light transmittance which produce predetermined variations in light intensity in the light filed tailored to the particular system.
  • This invention relates to an improved photographic method for printing a screen structure for a cathode-ray tube, such as a color television picture tube.
  • a commercial picture tube for color television. or a color kinescope as it is sometimes called, is a cathode-ray tube which includes a viewing screen comprised generally of a multiplicity of red-emitting, green-emitting and blue-emitting phosphor elements. These elements are usually arranged on the inner surface of the faceplate panel of the picture tube in a regular cyclic array.
  • the phosphor elements are usually dots arranged in groups of threes or triads, each triad having a red-emitting dot, a greenemitting dot and a blue-emitting dot.
  • the phosphor elements are usually dots arranged in groups of threes or triads, each triad having a red-emitting dot, a greenemitting dot and a blue-emitting dot.
  • the process for forming the phosphor elements must be capable of producing a very large number of phosphor elements of relatively small and uniform size which are accurately positioned with respect to one another,
  • the complexity of the problem is demonstrated by the fact that the viewing screen for a shadow mask-type kinescope may include more than a million phosphor dots, each of about 12 mils in diameter.
  • the inner surface of the faceplate panel is coated with a mixture of phosphor particles and a photosensitive binder.
  • a light field is projected from a point source upon the coating through the shadow mask ofthe tube, which mask functions as a photographic master or negative in the process.
  • the exposed coating is subsequently developed to produce phosphor elements of the first phosphor; for example, blue-emitting phosphor dots.
  • the process is repeated for the green-emitting phosphor elements and again for the red-emitting phosphor elements using the same shadow mask as a photographic master.
  • the point source is appropriately offset during the exposure steps so as to produce phosphor elements which are displaced from one another to form the prescribed triads.
  • the size of the phosphor elements is deter mined in part by the size of the holes in the shadow mask, by the spacing of the shadow mask from the phosphor-photosensitive binder coating, and by the amount of light exposure of the coating. With respect to this last factor, the greater the exposure, the larger will be the phosphor elements formed. Hence, the exposure is carefully controlled with respect to light intensity and with respect to duration ofexposure. In addition, the difference in light intensity between the edge and the center of the projected light field (due to the geometry of the optical system) is compensated for by geometrically arrayed coatings of opaque material (usually circular bands of rhodium metal) on one or more optical elements in the optical system.
  • opaque material usually circular bands of rhodium metal
  • the lighthouse includes an ultraviolet lamp in a light box which has a single window in the form of a light pipe, such as a quartz rod, that is tapered to a small cross-sectional area of controlled shape at its terminal end.
  • the terminal end functions as the point source of light from which the light field is projected first through an optical refracting lens or lenses, then through the photographic master and then incident a light sensitive layer.
  • the light field has both bright spots and dim spots which are peculiar to each particular lighthouse.
  • an optical filter coating comprised of silver particles in a binder.
  • the transmission characteristic of the filter is the negative pattern of the localized bright spots in the central portion of the light field.
  • this optical filter coating is produced by exposing a silver halide emulsion coating to the light field in the exact position in which it is to be used in the lighthouse. The exposed coating is then developed, producing a layer of silver particles in a binder, While such a process produces usable filters, nevertheless the metallic silver particles, which are the active part of the filter, tend to grow to sizes that are so large as to produce scattering of light from the light field.
  • the usable silver halide emulsions have a small grain size and therefore a high contrast characteristic with a gamma greater than I and usually about 3 to 7. This restricts the useful expo sure range for making the filter within very narrow limits, since it is desired to produce a sufficient number of steps in the gray scale in the final filter.
  • a photosensitive layer having a gamma of about 1.0 is preferred.
  • a light field is projected through a photographic master toward a photosensitive layer as in the prior art.
  • the light field is also passed through a filter comprised of preformed, nonmetallic, light-absorbing particles having a mean diameter in the range of 5 to 50 millimicrons in a light-transmitting binder.
  • the filter has variations in light transmittance which produce predetermined variations in light intensity in the light field tailored to the particular system.
  • the transmittance of the filter is inverse to the light intensity in the light field; that is, the filter is less transmitting to the brighter portions of the light field and more transmitting to the dimmer portions of the light field.
  • the efi'ect of this filter is to compensate for part or all of the light intensity variations in the light field by reducing the brightness of the brighter portions of the light field.
  • the transmittance of the filter is graded to provide in the light field brighter and dimmer regions according to a predetermined design.
  • the filter in its preferred forms consists essentially of finely divided, preformed, lightabsorbing material particles of carbon having a mean particle size in the range of about 5 to 50 millimicrons, and preferably channel black particles having a mean particle size in the range of 9 to 29 millimicrons.
  • An advantage of the novel method is that very little light is scattered from the light field by the finely divided, preformed, nonmetallic particles. While the reason is not understood, it is believed the mean diameter of the particles is smaller and more uniform than previously used silver particles derived from a silver halide emulsion. In addition, the method is reliable and long lived because the particles-binder combination is stable to ultraviolet and to other radiation over extended periods of use.
  • the novel method may include the steps of preparing the above-described filter.
  • the filter may be prepared by coating a support with a photosensitive composition including preformed, nonmetallic, light-absorbing particles and the light-transmitting binder therefor, Then, the coated support is positioned in the optical system in which it is to be used. The positioned coating is exposed to the light field for a period of time sufficient to produce, in incremental areas of the coating, upon subsequent development, predetermined variations in light transmittance. Then, the coating is developed to produce the filter layer.
  • the nonmetallic particles are formed and stabilized in size prior to preparing the filter.
  • the particles in the filter are of a small, substantially uniform, nonscattering size.
  • the photosensitive coating has a gamma near the optimum of L0, thereby providing the desired grey scale in the filter.
  • FIG. 1 is a partially broken away elevational view of a lighthouse comprising an optical assembly including a filter on the surface of one lens.
  • the lighthouse has a faceplate panel thereon in position for practicing one form of the novel method.
  • FIG. 2 is a partially broken away elevational view of another lens assembly for the lighthouse of FIG. 1.
  • the assembly includes a filter on the surface of another lens.
  • FIG. 3 is a partially broken away elevational view of another lens assembly for the lighthouse of FIG. I.
  • the assembly includes a filter on the surface of a separate optical element from the lenses of the assembly.
  • FIG. 4 is a sectional elevational view ofa tank in the process of developing a filter according to one feature of the invention.
  • the novel method may be practiced in the lighthouse illustrated in FIG. I.
  • the lighthouse is comprised of a light box 21 and a panel support 23 held in position by bolts (not shown) with respect to one another on a base 25 which in turn is supported at the desired angle by legs 27.
  • the light box is a cylindrical cup-shaped casting closed at one end by an integral end wall 29.
  • the other end of the light box 21 is closed by a plate 3! which fits in a circular recess 33 in the light box 21.
  • the plate 3] has a central hole therein through which a light pipe 35 (referred to as a collimator in the tube making art) in the form of a tapered glass rod extends.
  • the narrow end 47 of the light pipe 35 extends slightly beyond the plate 31 and constitutes a point source of light for the lighthouse.
  • the wider end 39 of the light pipe 35 is held in position by a bracket 41 opposite a lamp 43 within the light box 2 l.
  • a light reflector 45 is positioned behind the lamp 43.
  • a lens assembly SI is mounted on a lens assembly support ring 53 and stand off spacers 55 with bolts 57.
  • the support ring is clamped in position between the light box 21 and the panel support 23.
  • the lens assembly is comprised of a correction lens 6! and a wedge lens 63 held and spaced from each other by a separator ring 65, an upper clamp 67 and a lower clamp 69.
  • the upper surface of the wedge lens 63 has thereon an optical filter 71.
  • the filter 7! is in the form ofa reliefimage comprised of preformed carbon particles (mean diameter about millimicrons) in gelatin or other clear colorless binder.
  • the filter 7l varies in thickness up to about 3,000 angstroms thick. This is about a half-wavelength for yellow light. Because of its thickness, an observer may see interference patterns in the filter, which patterns have been found not to interfere with the novel method. These interference patterns may be eliminated by applying over the filter 71 an overcoating of clear colorless gelatin or a similar
  • the filter has essentially a neutral gray transmittance varying only in the intensity of grayness.
  • the intensity of grayness varies from point-to-point so that point-to-point variations in brightness in the light field are reduced. That is, the filter has variations in transmittance which are in registration with and inverse to the variations in intensity in the light field passing through the filter. These variations in transmittance reduce the light intensity variation in the light field.
  • the filter may include other compensations besides those for point-topoint intensity variations.
  • the filter may include compensations for the geometry of the system, such as a center-to-edge variation in light intensity due to the spreading of the light.
  • the filter may be designed to impart predetermined variations in light intensity in the light field.
  • the filter may be used to produce a more uniform light field or a field with predetermined light intensity variations.
  • the compensations may be achieved solely with the above described filter or in combination with other types of filters, such as metal opaquing bands or one or more of the optical elements.
  • a faceplate panel 73 having a layer 75 comprised of light-sensitive binder and phosphor particles on the inner surface thereof and a mask assembly 77 mounted therein is placed in position on the panel support 23 as shown in FIG. I.
  • a light field from the narrow end 37 of the light pipe 35 passes upwardly through the wedge lens 63, the filter 71 and the correction lens 61.
  • the point-to-point intensity variations in the light field are reduced by the selected transmittance in the filter.
  • the light field then passes upwardly through the apertures 79 in the mask assembly 77.
  • the light passing through the apertures falls incident upon the phosphor layer 75 exposing the light sensitive binder, thereby changing its solubility characteristics.
  • the binder Since the light intensity is more uniform across the light filed, the binder is more uniformly exposed. After cxposure, usually of the order of 5 to 25 minutes, the light is eclipsed, the panel 73 is removed from the support, the mask assembly 77 is removed from the panel 73, and the phosphor layer 75 is developed to produce the desired image on the panel 73.
  • the filter 7] may reside on the top surface of the compensating lens 6t as shown in FIG. 2 or may reside on the top surface of a separate optical element 81 as shown in FIG. 3 wherein it is positioned between the compensating lens 61 and the wedge lens 63, instead of on the wedge lens 63 as shown in FIG. I.
  • the assembly 51 may be mounted as shown in FIG. I.
  • the separate optical element 8! with the filter 71 thereon may be mounted near the mask assembly 77 as shown by the dotted box 83 in FIG. 1.
  • the functions of the correction lens 61 and the wedge lens 63 may be combined into a single lens.
  • the filter 71 shown in FIG. I may be prepared by the following process.
  • the upper surface of the wedge lens 63 which is about 1 1% inches in diameter is first cleansed, rinsed in an 0.05 weight percent aqueous gelatin solution and then dried.
  • the surface is then rinsed in warm (50 C.) deionized water and again dried, leaving a thin gelatin precoating on the surface.
  • the precoated surface is coated with a light-sensitive composition comprised of very fine particle carbon in a sensitized gelatin binder.
  • the preferred carbon is a channel black called Black Pearls 607 marketed by Cabot Corporation, Boston, Mass. This material has a means particle diameter of about 9 millimicrons by electron micrograph (E.M.) study.
  • One suitable coating composition contains about grams Black Pearls 607, about 12 grams Marasperse CB dispersing .rgent, about 42 grams Brij 35 SP wetting agent, about 1,380 rams gelatin, about 10,000 grams deionized water, about 37 grams Hardener 03 (4,4'-diazidostilbene-2,2'-disulfonic acid sodium salt) which is a sensitizer for the gelatin. and about 300 grams ammonium hydroxide solution.
  • a warm (40 C.) quantity (about 150 cc) of this liquid composition is poured upon the slowly rotating lens. The lens is then spun at about 60 rpm. until the composition has spread to a uniform layer about 1 mil thick and then gelled (about 3 minutes).
  • the coated wedge lens 63 is placed in the lens assembly 51 in the position in which it is to be used.
  • a light field is projected from the light pipe 35 incident upon the coating for about 2-5 minutes at about 45 foot candles. The optimum exposure is determined empirically.
  • the exposed coated lens is then removed from the lighthouse and placed in a dilute (about 0.01 to 1.0 weight percent) solution of potassium alum for about 5 minutes at room temperature and then placed in a laminar flow trough, such as the trough 83 shown in FIG. 4.
  • the lens 61 is placed on a holder 85 with the exposed coating 'l'la faced down.
  • the trough 83 is filled with flowing warm (50 C.) water 87 which is fed in through a tube 89 and overflows through an orifice 91.
  • Laminar flow is achieved by providing a metal wool baffle 93 upstream from the lens 61 and a solid baffle 95 having a slot at the bottom thereof downstream of the lens 61.
  • the water is permitted to flow slowly for about 30 minutes through the trough 83 being careful not to disturb the system.
  • the unexposed coating slowly dissolves leaving the exposed material in position on the lens.
  • the temperature of the water flowing through tube 89 is then lowered to C., and the solid baffle 95 is removed.
  • the temperature of the water leaving orifice 91 is below C., the lens is removed from the trough.
  • the lens is dried and is ready for use. In use, the lens is positioned in the identical position in which the coating was exposed during the preparation of the filter 71.
  • photosensitive coatings may be used in place of the gelatin-carbon mixture described above.
  • Channel blacks and furnace blacks with mean particle diameter (E.M.) in the range of about 5 to 50 millimicrons can be used.
  • Channel blacks having a mean particle diameter in the range of 9 to 29 millimicrons are preferred.
  • Other dark colored substances that may be used are dark colored oxides of manganese, cobalt and nickel.
  • the photosensitive coating have a spectral absorptivity that is fairly closely matched to the spectral sensitivity of the light sensitive layer which is later to be exposed through the filter. Also, it is preferred that the light-absorbing particles in the filter be as small as possible.
  • the preferred coating material consists essentially of a gelatin binder, fine particle carbon pigment, wetting and dispersing agents, an organic photosensitizing agent, and water as a solvent.
  • Sensitized gelatin is the preferred photobinder because it gels during the last stage of development preventing mechanical handling damage to the soft relief image. But, other photobinders may be used.
  • the means particle diameter must be extremely small; in the range of 5 to 50 millimicrons.
  • An important feature of the invention is the use of nonmetallic particles whose size is determined before and not during and/or after the filter is fabricated.
  • the binder and the pigment are the essential parts of the final filter; other materials are required only in filter fabrication and should have low light absorption properties or should be added in the lowest practicable concentrations.
  • Wetting and dispersing agents are added to improve adherence of the filter to the support and to produce smoother more uniform coatings. Marasperse" dispersing agents are marketed by American Can Co., N. Y.,
  • Gelatin (weight percent) s 1-25 Carbon/gelatin ratio 0 001-0. 5 Disporsing agent/carbon ratio s 0ll 0 Wetting agent/carbon ratio 0. 01-1 0 Photosensitizing agent/gelatin ratio s s 0 005-0 20 Ammonium hydroxide to maintain pH 8.5-9. 5. Water, remainder.
  • the light sensitive material may be applied to a transparent substrate in any manner which provides a relatively uniform, excessively thick dried layer. These methods include dip coating, flow coating, and spin coating. Coating thickness variation is not critical when organic photosensitizers are incorporated in the formulation.
  • Photoexposure of the dried photosensitive coating is accomplished preferably in the optical apparatus in which the finished filter is to be used.
  • the light source of the apparatus must emit actinic light.
  • the filter is then replaced in the apparatus after processing in the same orientation in which it was exposed since density variations printed in the filtermatch incident light intensity variations.
  • Exposure of the photosensitive coating must be accomplished through the transparent substrate thereby first hardening the coating material adjacent to the substrate on which it resides. As exposure continues, hardening progresses into the photosensitive layer forming a continuous tone relief image.
  • the process of fabrication with carbon-gelatin compositions provides filters not attainable before, which will automatically correct for bright spots or dark spots in an optical field. Grain size of the particles of the filter is small enough not to distort an image significantly by light scattering, and filter uniformity is improved. By comparison nearly all photographic silver emulsions have excessively large grain size. Lippmann-type silver emulsions have small grain size, but cannot be developed sufficiently uniformly to a continuous tone grey scale.
  • the novel method may be used to prepare any screen structure by a photographic process. Dot screens and line screens are examples.
  • screen structure is meant any component part of a cathode-ray tube target; for example a luminescent layer, or a light-absorbing layer.
  • the novel process may be used to expose a layer comprised of photobinder-particles mixture, or to expose a clear photoresist and then phosphor particles or light absorbing particles may be deposited on the exposed areas.
  • a phosphor screen structure is deposited directly by exposing a layer comprised of phosphor particles mixed with a photobinder.
  • An alternative method is to expose a layer of clear photobinder, then deposit phosphor particles thereon and then remove more soluble portions of the photobinder and the overlying phosphor particles.
  • Another method for preparing a phosphor screen structure is to expose a layer of clear photobinder, remove the more soluble portions thereof, then deposit phosphor particles thereover and finally remove the less soluble portions of the photobinder layer with the phosphor particles thereon and leaving phosphor particles in the portions previously occupied by the more soluble portions of the photobinder layer.
  • the novel process may also be used to produce nonluminescent screen structures, such as a light absorbing matrix.
  • an example of this is to expose a clear photobinder layer to a light image, remove the more soluble portions thereof then deposit light absorbing particles such as fine'particlc graphite thereover, then remove the less soluble portions of the photobinder layer with the light-absorbing particles thereon and leaving the light-absorbing particles in the portions previously occupied by the more soluble portions of the photobinder layer.
  • the novel method may be used to prepare either luminescent or nonluminescent screen structures by a photographic method.
  • said filter includes a layer consisting essentially of finely divided carbon particles in a light-transmitting binder, and the light transmittance variations thereof were derived from said light field.
  • said filter consists essentially of finely divided particles of channel black in a light transmitting binder, said particles having a means diameter in the range of about 9 to 29 millimicrons.
  • step (A) the defined for producing said filter layer comprising i. coating a support for said filter layer with a photosensitive composition including preformed, nonmetallic, light-absorbing particles and a binder therefor, said particles having a mean particle diameter in the range of about 5 to 50 millimicrons,
  • step (i) are carbon particles.
  • step (i) are channel black carbon having a mean particle diameter in the range of about 9 to 29 millimicrons.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Optical Filters (AREA)
  • Optical Elements Other Than Lenses (AREA)
US844852A 1969-07-25 1969-07-25 Photographic printing of cathode-ray tube screen structure Expired - Lifetime US3592112A (en)

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US84485269A 1969-07-25 1969-07-25

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US (1) US3592112A (enrdf_load_stackoverflow)
JP (1) JPS4913425B1 (enrdf_load_stackoverflow)
DE (1) DE2036684C3 (enrdf_load_stackoverflow)
FR (1) FR2055544A5 (enrdf_load_stackoverflow)
GB (1) GB1269749A (enrdf_load_stackoverflow)
NL (1) NL7011003A (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785720A (en) * 1972-05-23 1974-01-15 W Kyryluk Filter for obtaining a three-dimensional effect
US3944733A (en) * 1969-09-15 1976-03-16 Tuttle Fordyce E Signal recognition apparatus
US3953209A (en) * 1973-08-20 1976-04-27 Rca Corporation Method for preparing supplemental filter for lighthouse
US4021820A (en) * 1973-08-20 1977-05-03 Rca Corporation Lighthouse having a main filter and a supplemental filter
US4046929A (en) * 1975-05-09 1977-09-06 Vicon Industries, Inc. Attenuation spot filters manufacturing process
US4099187A (en) * 1975-08-15 1978-07-04 Rca Corporation Shadow mask color picture tube having a mosaic color screen with improved tolerances
US4157215A (en) * 1978-04-24 1979-06-05 Rca Corporation Photodeposition of CRT screen structures using cermet IC filter
US4488793A (en) * 1982-12-23 1984-12-18 Rca Corporation Photodepositing a CRT screen structure using discrete-element optical filter
US4521501A (en) * 1983-07-14 1985-06-04 Rca Corporation Method for reducing degradation of an optical image in an exposure lighthouse
US4812485A (en) * 1987-02-12 1989-03-14 Rca Licensing Corporation Ultraviolet-resistant noise-reducing member and method of making same
US5582703A (en) * 1994-12-12 1996-12-10 Palomar Technologies Corporation Method of fabricating an ultra-high resolution three-color screen
EP0952603B1 (en) * 1994-01-21 2006-11-22 Hitachi, Ltd. Display screen for a colour cathode-ray tube

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5366670U (enrdf_load_stackoverflow) * 1976-11-08 1978-06-05
DE2902239C2 (de) * 1979-01-20 1983-01-20 Standard Elektrik Lorenz Ag, 7000 Stuttgart Verfahren zur Herstellung der Leuchtstoffstreifen auf dem Bildschirm einer Farbbildröhre
DE3027704C2 (de) * 1980-07-22 1984-03-22 Standard Elektrik Lorenz Ag, 7000 Stuttgart Verfahren zur Herstellung eines Korrekturfilters für die Belichtung der Leuchtschirme von Farbbildröhren

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3448667A (en) * 1963-10-18 1969-06-10 Sylvania Electric Prod Light attenuation means

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3448667A (en) * 1963-10-18 1969-06-10 Sylvania Electric Prod Light attenuation means

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3944733A (en) * 1969-09-15 1976-03-16 Tuttle Fordyce E Signal recognition apparatus
US3785720A (en) * 1972-05-23 1974-01-15 W Kyryluk Filter for obtaining a three-dimensional effect
US3953209A (en) * 1973-08-20 1976-04-27 Rca Corporation Method for preparing supplemental filter for lighthouse
US4021820A (en) * 1973-08-20 1977-05-03 Rca Corporation Lighthouse having a main filter and a supplemental filter
US4046929A (en) * 1975-05-09 1977-09-06 Vicon Industries, Inc. Attenuation spot filters manufacturing process
US4099187A (en) * 1975-08-15 1978-07-04 Rca Corporation Shadow mask color picture tube having a mosaic color screen with improved tolerances
US4157215A (en) * 1978-04-24 1979-06-05 Rca Corporation Photodeposition of CRT screen structures using cermet IC filter
US4488793A (en) * 1982-12-23 1984-12-18 Rca Corporation Photodepositing a CRT screen structure using discrete-element optical filter
US4521501A (en) * 1983-07-14 1985-06-04 Rca Corporation Method for reducing degradation of an optical image in an exposure lighthouse
US4812485A (en) * 1987-02-12 1989-03-14 Rca Licensing Corporation Ultraviolet-resistant noise-reducing member and method of making same
EP0952603B1 (en) * 1994-01-21 2006-11-22 Hitachi, Ltd. Display screen for a colour cathode-ray tube
US5582703A (en) * 1994-12-12 1996-12-10 Palomar Technologies Corporation Method of fabricating an ultra-high resolution three-color screen

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Publication number Publication date
JPS4913425B1 (enrdf_load_stackoverflow) 1974-03-30
NL7011003A (enrdf_load_stackoverflow) 1971-01-27
GB1269749A (en) 1972-04-06
DE2036684B2 (de) 1979-03-01
DE2036684C3 (de) 1979-10-25
DE2036684A1 (de) 1971-01-28
FR2055544A5 (enrdf_load_stackoverflow) 1971-05-07

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