[go: up one dir, main page]

US2705764A - Dual-area target electrodes and methods of making the same - Google Patents

Dual-area target electrodes and methods of making the same Download PDF

Info

Publication number
US2705764A
US2705764A US146297A US14629750A US2705764A US 2705764 A US2705764 A US 2705764A US 146297 A US146297 A US 146297A US 14629750 A US14629750 A US 14629750A US 2705764 A US2705764 A US 2705764A
Authority
US
United States
Prior art keywords
emissive
area
phosphor
light
screen
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 - Lifetime
Application number
US146297A
Inventor
Frederick H Nicoll
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.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Priority to US146297A priority Critical patent/US2705764A/en
Application granted granted Critical
Publication of US2705764A publication Critical patent/US2705764A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18Luminescent screens
    • H01J29/30Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines
    • H01J29/32Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines with adjacent dots or lines of different luminescent material, e.g. for colour television

Definitions

  • the light-emissive area comprises a multiplicity of parallel phosphor lines, each capable of emitting light of a particular color component.
  • the signal-generating area comprises a number of discrete secondary-electron emissive indicia.
  • the indicia are in the form of line segments. They are disposed in register with the phosphor lines, along the marginal edge of the light-generating area.
  • the secondary-electrons resulting from the periodic impact of the beam upon the signal-generating area are picked up on a collector electrode.
  • the resulting signals are applied to an appropriate detlecting member and are thus used to control the accuracy with which the beam strikes the individual phosphor lines.
  • the light-emissive and signal-generating areas comprise the same materials, e. g., phosphor and aluminum.
  • the materials which are used in making this dualarea screen are not ordinarily regarded as secondaryelectron emissive materials. That is to say, they could not be used with any degree of success as the source of secondary-electrons in an electron multiplier, for exampie.
  • the amplitude of the signals derived from the signal-generating area is a function not of the secondary to primary-electron emissive-ratio of a particular material but is a function of the difference in the emissive ratios of (a) the surface of the indicia per se and (b) the surface immediately adiacent to or surrounding the indicia.
  • the outer surface of the signal-generating indicia and the outer surface immediately surrounding said indicia are constituted of the same metal (e. g., aluminum) and are applied, preferably, in the same way (e. g., by an evaporation process).
  • the active surfaces of the screen might logically be assumed to have the same secondary to primary-electron emissive ratios.
  • the above-mentioned difference in the secondary-electron emissive ratios of the two areas may be attributed to a difference (later described) in the contour (rather than a dilference in the chemistry) of the outer surfaces of said areas.
  • Fig. 1 is a fragmentary View in perspective of a viewing screen having discrete light-emissive and signalgenerating areas
  • Figs. 2 to 5 inclusive are sectional views, taken along the line 2 2 of Fig. 1, illustrative of the several steps employed in making the finished screen of Fig. 1;
  • Fig. 6 is a greatly enlarged fragmentary sectional view showing the peculiar surface and sub-surface contours of the different screen areas
  • s Fig. 7 is a front View of an oscilloscope having a dualarea screen of another pattern, within the scope of the invention.
  • the electron-sensitive viewing-screen or target-electrode 1 shown in perspective in Fig. 1 is of the same pattern as the one used by Bond in his color-kinescope.
  • lt comprises a glass foundation plate 3 and contains, on one of its major faces S, a light-emissive area 7 and a signal-generating area 9.
  • the light-emissive area 7 comprises a number of groups-of-three phosphor lines 11, 13, and 15, each capable of emitting light of a particular color component when bombarded by an electron-beam (not shown).
  • Phosphor compounds that tluoresce in the conventional, red, blue and green color components are: For red, cadmium borate with a manganese activator; for blue, calcium magnesium silicate with titanium activator; for green, zinc silicate with manganese activator.
  • Leverenz U. S. Patent 2,310,863 may bereferred to for examples of other suitable phosphor compounds.
  • the light-emissive area may include many hundreds of such lines.
  • the signal-generating area 9 includes a number of secondary-electron emissive indicia in the form of linesegments 17, 19, arranged, respectively, in columns 27, and 29, in line with the respective red and blue (B) phosphor lines.
  • B red and blue
  • the two-element code in which the indicia are arranged is recommended for use in connection with three-color phosphor-line screens.
  • a collector electrode Prior to use, a collector electrode (not shown), is mounted in a position to collect the secondary-electrons released from the signal-generating area 9 by the electron beam (not shown) in its excursions across the surface of the screen.
  • the first step is to lay down the phosphor lines and line-segments onthe foundation surface 5 of the plate 3.
  • the ne crystalline particles 21 (see Fig. 6) of which the phosphor compounds are comprised may be deposited in the form of a paste by a process similar to the silk-screen process used in the printing art. l'n this case all lines and line-segments individual to one color component are pressed through the silk screen (not shown) at one time and the other lines and line-segments at other times.
  • the crystalline phosphor particles may be laid down by settling from a liquid suspension, one set of color lines at a time.
  • the phosphor particles retain their crystalline form.
  • the crystalline faces 23 of the particles 21 endow the phosphor lines 1l, i3, 1S and line-segments 17, 19 with a highly irregular surface, when viewed under a vmicroscope.
  • a film 31 constituted of collodion, butyl methacrylate resin, or other substance which can be vaporized or otherwise completely destroyed by heat This may be done by placing the plate 3 face-up in a tank of water (not shown), dropping a small quantity of the collodion or other material, in solution, on the surface of the water and then depositing the resulting film 31 on the plate either by lifting the plate or draining the water. The plate is then dried.
  • the third step in the process involves covering the phosphor line-segments 17 and I9 and, conveniently, the blank spaces 33 surrounding these phosphor indicia 17 and 19, with a mask 35 and then depositing a thin layer 37 of aluminum, silver or other easily vaporized metal over the mask and over the collodion film 31 as by an evaporation process, in vacuo.
  • the mask shown in Fig. 3
  • the plate is placed in an oven (not shown) for the purpose of vaporizing the collodion film 31.
  • the finely divided metal 37 formerly on the collodion film 31 (Fig.
  • -'-A mask 39 is now placed on or over the light-emissive area 7 of the screen to protect it during the next step in the process.
  • the plate is again placed in, a vacuum chamber (not shown) and another piece of the same metal (e. g. aluminum) is evaporated directly onto the irregular crystalline faces 23 of the signal-generating indicia 17 and 19, as indicated at 41.
  • the evaporated metal at the same time is deposited on the side wall of the indicia 19 of the right column 29 and over so much of the smooth surface 33 as has not been metalized by the fourth step.
  • the quantity of metal 41 evaporated upon the indicia 17 and 19, and upon surrounding surface 33 is preferably sufficient to cover these parts of the screen with metal to a thickness say twice as great as that of the smooth film 37' on the'light-emissive area 7.
  • the actual quantity of metal 41 evaporated upon a given crystalline face ⁇ depends to some etxent upon its orientation with respect to the source of the metal being evaporated. Thus all ofthe crystalline phosphor faces of the indicia 17 and 19, may not'receive the same quantity of metal.
  • the continuous metal film 37 which was laid down on the lightemissive area 7 as a result of the evaporation of its underlying collodion film 31 (Figs. 2 and 3) is also smooth.
  • the. difference in the contours of the metalized surfaces 37' and 41 of the screen may, and probably does, account for the difference in their secondary-to-primary electron-emissive ratios.
  • Fig. 7 shows the invention applied to a conventional light-emissive oscilloscope screen 43.
  • the secondary-electron emissive signal-generating indicia take the form of a parallel metalized-lines 45 applied directly to the crystalline faces of the phosphor particles of the screen.
  • the light-emissive area is covered on its rear or target. surface with a light retiecting continuous metal Afil'rn"4 7.
  • This filmV is,V of. course, made thin enough to render it transparent to the electron-beam which renders the phosphors luminescent.
  • the amplitude of the.- signals derived from the signal-generating indicia is afunction of the difference in the secondary-electron in theemissive ratios of the rough metal surface of the indicia 45 and the smooth metal surface 47 of the area innnediatelyl adjacent to the indicia.
  • the present invention provides an improved vdual-area target or .screen electrodes, and one wherein the light-emissive and signalgenerating areas are constituted of the ⁇ Same materials.
  • An electron-sensitive screen comprising a foundation surface containing a first and a second subdivided surface area consisting essentially of crystalline phosphor particles, a relatively smooth electron-pervious light-refleeting metal film spanning said first area and supported at random points on the crystalline faces of said phosphor particles, and a relatively rough adherent secondaryelectron emissive metal layer covering andintegral with individual ones of the crystalline faces of the phosphor particies of said second area.
  • An electron-sensitive color'screen comprising a support containing a light-emissive area consisting essentially of parallelly disposed phosphor lines each capable of emitting light of a particular color component, and a marginal-edge area containing spaced-apart signal-generating indicia in the form of phosphor line segments, a secondary-electron emissive metal surface-layer on said light-emissive area and a secondary-electron emissive metal surface layer on each of said signal-generating indicia, the surface contour of the metal surface layers on said signal-generating indicia being relatively rough and of a thickness greater than that of the metal surfacelayer on said color-emissive area, whereby said signal generating indicia exhibit a secondary-to-primary electron emissive-ratio other than that of said light-emissive area.
  • each of said signal generating line segments is aligned with a predetermined one of said phosphor lines of a par ⁇ - ticular color component.
  • Method of differentially metalizing the light-emissive and signal-generating phosphor areas on the screen of a color-kinescope in order to endow said areas with different secondary to primary-electron emissive-ratios comprising, coating said light-emissive area with a film constituted of a thermally vaporizable resinous substance, evaporating and depositing a metal onto said vaporizable resinous film and upon the exposed phosphor surfaces of said signal-generating area, and then heating said resinous film to vaporize the same and thereby to deposit the metal which was on said lm, -indirectly upon the underlying light-emissive area, 'whereby said directly and indirectly metalized areas of said screen exhibit different surface contours and hence different secondary to primary-electron emissive ratios.
  • a color-kinescope-screen of the type comprising) a foundation surface having discrete color-emissive and signal-generating areas thereon, said method comprising laying down crystalline phosphor particles of' a particular color-component on said lightemissive area in the form of a color-line and simultaneously laying down a line-segment constituted of crystalline Vphosphor particles on said signal-generating area, laying down a crystalline phosphor color-line and linesegrnent of another color component in the respective ones of said areas, evaporating and depositing metal directly upon the individual crystalline faces of said phosphor line-segments whereby to endow said segments with an irregular-metal surface having a certain secondaryelectron emissive characteristic, and forming a substantially'continuous, relatively smooth, metal layerV having a 'different secondary-electron emissive characteristic over s aid light-emissive area' and in the lspace betweenv said line-segments.

Landscapes

  • Luminescent Compositions (AREA)

Description

F. H. NICOLL DUAL-AREA T GET ELECTRODES AND METHODS OF' MAKING THE SAME Filed Feb 25, 1950 'April 5, 1955 United States Patent C r' DUAL-AREA TARGET ELECTRODES AND METHODS OF MAKING THE SAME Frederick H. Nicoll, Princeton, N. J., assignor to Radio Corporation of America, a corporation of Delaware Application February 25, 1950, Serial No. 146,297
8 Claims. (Cl. 313-68) This invention relates to electron-sensitive targets of the kind having both light-sensitive and signal-generating areas. Donald S. Bond, in U. S. application Serial No. 146,282, now Patent No. 2,689,926, tiled concurrently herewith, shows such a target, or screen, in a color kinescope.
In Bonds screen, the light-emissive area comprises a multiplicity of parallel phosphor lines, each capable of emitting light of a particular color component.' The signal-generating area comprises a number of discrete secondary-electron emissive indicia. The indicia are in the form of line segments. They are disposed in register with the phosphor lines, along the marginal edge of the light-generating area. The secondary-electrons resulting from the periodic impact of the beam upon the signal-generating area are picked up on a collector electrode. The resulting signals are applied to an appropriate detlecting member and are thus used to control the accuracy with which the beam strikes the individual phosphor lines.
In the amplifier tube art, whenever a secondaryelectron emissive surface is required, the practice is to use an emissive compound of the highest possible seeondary-to-primary electron emissive-ratio. Ceasiated silver is such a compound.
It is impossible, as a practical matter, to employ conventional highly emissive compounds in making codemarks on a phosphor-line screen. There are three difficulties: (1) Achieving the desired orientation and spacing of the indicia with respect to the phosphor lines; (2) avoiding contamination of the several light-emissive phosphor compounds by the gases used in sensitizing the secondary-electron emissive material; (3) getting the emissive material to exhibit a satisfactory high emissiveratio when it is bombarded by high-velocity primaryelectrons.
These diiculties are avoided, in accordance with the present invention, by the provision of a dual-area screen wherein the light-emissive and signal-generating areas comprise the same materials, e. g., phosphor and aluminum. The materials which are used in making this dualarea screen are not ordinarily regarded as secondaryelectron emissive materials. That is to say, they could not be used with any degree of success as the source of secondary-electrons in an electron multiplier, for exampie.
lhe reason it is possible to use relatively non-emissive materials is that in a dual-area screen the amplitude of the signals derived from the signal-generating area is a function not of the secondary to primary-electron emissive-ratio of a particular material but is a function of the difference in the emissive ratios of (a) the surface of the indicia per se and (b) the surface immediately adiacent to or surrounding the indicia.
As above indicated, in the screens of the invention the outer surface of the signal-generating indicia and the outer surface immediately surrounding said indicia are constituted of the same metal (e. g., aluminum) and are applied, preferably, in the same way (e. g., by an evaporation process). Hence, both, or indeed all, of the active surfaces of the screen might logically be assumed to have the same secondary to primary-electron emissive ratios. t*
It is therefore only possible to speculate as to the reason why the indicia and the non-indicia surface portions of the screen exhibit a pronounced difference in the secondary-electron emissive characteristics.
Without in any way limiting the invention to a partic- 2,705,764 Patented Apr.y 5, 1955 ular theory of operation, the above-mentioned difference in the secondary-electron emissive ratios of the two areas may be attributed to a difference (later described) in the contour (rather than a dilference in the chemistry) of the outer surfaces of said areas.
The invention is described in greater detail in connection with the accompanying drawing, wherein:
Fig. 1 is a fragmentary View in perspective of a viewing screen having discrete light-emissive and signalgenerating areas,
Figs. 2 to 5 inclusive are sectional views, taken along the line 2 2 of Fig. 1, illustrative of the several steps employed in making the finished screen of Fig. 1;
Fig. 6 is a greatly enlarged fragmentary sectional view showing the peculiar surface and sub-surface contours of the different screen areas, and s Fig. 7 is a front View of an oscilloscope having a dualarea screen of another pattern, within the scope of the invention.
The electron-sensitive viewing-screen or target-electrode 1 shown in perspective in Fig. 1 is of the same pattern as the one used by Bond in his color-kinescope. lt comprises a glass foundation plate 3 and contains, on one of its major faces S, a light-emissive area 7 and a signal-generating area 9.
The light-emissive area 7 comprises a number of groups-of-three phosphor lines 11, 13, and 15, each capable of emitting light of a particular color component when bombarded by an electron-beam (not shown).
Phosphor compounds that tluoresce in the conventional, red, blue and green color components are: For red, cadmium borate with a manganese activator; for blue, calcium magnesium silicate with titanium activator; for green, zinc silicate with manganese activator. Leverenz U. S. Patent 2,310,863 may bereferred to for examples of other suitable phosphor compounds.
In Fig. l, in the interests of simplicity, but twelve phosphor-lines are shown. Actually, the light-emissive area may include many hundreds of such lines.
The signal-generating area 9 includes a number of secondary-electron emissive indicia in the form of linesegments 17, 19, arranged, respectively, in columns 27, and 29, in line with the respective red and blue (B) phosphor lines. As explained in the Bond application, the two-element code in which the indicia are arranged, is recommended for use in connection with three-color phosphor-line screens. Prior to use, a collector electrode (not shown), is mounted in a position to collect the secondary-electrons released from the signal-generating area 9 by the electron beam (not shown) in its excursions across the surface of the screen.
In applying the invention to the manufacture of a line-screen of the character described, the first step ,is to lay down the phosphor lines and line-segments onthe foundation surface 5 of the plate 3. The ne crystalline particles 21 (see Fig. 6) of which the phosphor compounds are comprised may be deposited in the form of a paste by a process similar to the silk-screen process used in the printing art. l'n this case all lines and line-segments individual to one color component are pressed through the silk screen (not shown) at one time and the other lines and line-segments at other times. Alternatively, the crystalline phosphor particles may be laid down by settling from a liquid suspension, one set of color lines at a time. ln either event, as shown in Figs. 2 to 6 inclusive, the phosphor particles retain their crystalline form. As shown more clearly in Fig. 6 the crystalline faces 23 of the particles 21 endow the phosphor lines 1l, i3, 1S and line- segments 17, 19 with a highly irregular surface, when viewed under a vmicroscope.
Referring to Fig. 2.-The next step is to cover phosphor lines 11, 13, 15, etc. and line segments 17, 19, etc. with a film 31 constituted of collodion, butyl methacrylate resin, or other substance which can be vaporized or otherwise completely destroyed by heat, This may be done by placing the plate 3 face-up in a tank of water (not shown), dropping a small quantity of the collodion or other material, in solution, on the surface of the water and then depositing the resulting film 31 on the plate either by lifting the plate or draining the water. The plate is then dried.
Referring to Fi 3.-'I'he third step in the process involves covering the phosphor line-segments 17 and I9 and, conveniently, the blank spaces 33 surrounding these phosphor indicia 17 and 19, with a mask 35 and then depositing a thin layer 37 of aluminum, silver or other easily vaporized metal over the mask and over the collodion film 31 as by an evaporation process, in vacuo. Referring to Fig. 4,-In the next step the mask (shown in Fig. 3) is removed and the plate is placed in an oven (not shown) for the purpose of vaporizing the collodion film 31. As a result the finely divided metal 37 formerly on the collodion film 31 (Fig. 3) is deposited over the entire light-emissive area 7 in the form of a continuous, relatively fiat, smooth layer or film 37. As shown more clearly in Fig. 6, this smooth metal film 37 is supported at random points on the crystalline faces 23 Vof the phosphor particles 21. The vaporization of the collodion film restores the surface of the phosphor line- segments 17 and 19 to their original bare state.
Referring to Fig. 5. -'-A mask 39 is now placed on or over the light-emissive area 7 of the screen to protect it during the next step in the process. In this next step the plate is again placed in, a vacuum chamber (not shown) and another piece of the same metal (e. g. aluminum) is evaporated directly onto the irregular crystalline faces 23 of the signal-generating indicia 17 and 19, as indicated at 41. The evaporated metal at the same time is deposited on the side wall of the indicia 19 of the right column 29 and over so much of the smooth surface 33 as has not been metalized by the fourth step. The quantity of metal 41 evaporated upon the indicia 17 and 19, and upon surrounding surface 33 is preferably sufficient to cover these parts of the screen with metal to a thickness say twice as great as that of the smooth film 37' on the'light-emissive area 7. The actual quantity of metal 41 evaporated upon a given crystalline face `depends to some etxent upon its orientation with respect to the source of the metal being evaporated. Thus all ofthe crystalline phosphor faces of the indicia 17 and 19, may not'receive the same quantity of metal.
Referring to F ig. 6.-When the mask 39, shown in Fig. 5, is removed from the light-emissive area 7 the differences inthe contour of the metalized areas of the screen, can be observed. The metalized surface 41 on the signalgenerating indicia 17 and 19 is relatively rough due to the fact that vthe metal was deposited directly upon the irregular crystalline faces of the phosphor particles. The
metal deposited upon the smooth glass surface area 53 surrounding said indicia is smooth. Similarly, the continuous metal film 37 which was laid down on the lightemissive area 7 as a result of the evaporation of its underlying collodion film 31 (Figs. 2 and 3) is also smooth. As previously set-forth, the. difference in the contours of the metalized surfaces 37' and 41 of the screen may, and probably does, account for the difference in their secondary-to-primary electron-emissive ratios.
' Thus'far, reference has been made only to color-kinescope screens wherein the signal-generating indicia 17 and 19 are separated from the light-emissive area 7 by a space 33. The invention however is not limited to such screens. That this is so will be apparent from an inspection of Fig. 7.
` Fig. 7 shows the invention applied to a conventional light-emissive oscilloscope screen 43. Here the secondary-electron emissive signal-generating indicia take the form of a parallel metalized-lines 45 applied directly to the crystalline faces of the phosphor particles of the screen. The light-emissive area is covered on its rear or target. surface with a light retiecting continuous metal Afil'rn"4 7. This filmV is,V of. course, made thin enough to render it transparent to the electron-beam which renders the phosphors luminescent. Here as inthe earlier d escribed embodiment of the invention the amplitude of the.- signals derived from the signal-generating indicia is afunction of the difference in the secondary-electron in theemissive ratios of the rough metal surface of the indicia 45 and the smooth metal surface 47 of the area innnediatelyl adjacent to the indicia. v
From the foregoing it will be apparent that the present invention provides an improved vdual-area target or .screen electrodes, and one wherein the light-emissive and signalgenerating areas are constituted of the `Same materials.
What is claimed is:
l. An electron-sensitive screen comprising a foundation surface containing a first and a second subdivided surface area consisting essentially of crystalline phosphor particles, a relatively smooth electron-pervious light-refleeting metal film spanning said first area and supported at random points on the crystalline faces of said phosphor particles, and a relatively rough adherent secondaryelectron emissive metal layer covering andintegral with individual ones of the crystalline faces of the phosphor particies of said second area.
2. The device as set forth in claim l wherein said lightreflecting metal film and said secondary-electron emissive metal layer are constituted of the same metal.
3. The device as set forth in claim l wherein said first area is light emissive and said second area is signal generating, said first and said second subdivided areas having their subdivisions disposed in substantially parallel lines, and said signal generating areas are juxtaposed to selected portions of said light emitting area.
4. An electron-sensitive color'screen comprising a support containing a light-emissive area consisting essentially of parallelly disposed phosphor lines each capable of emitting light of a particular color component, and a marginal-edge area containing spaced-apart signal-generating indicia in the form of phosphor line segments, a secondary-electron emissive metal surface-layer on said light-emissive area and a secondary-electron emissive metal surface layer on each of said signal-generating indicia, the surface contour of the metal surface layers on said signal-generating indicia being relatively rough and of a thickness greater than that of the metal surfacelayer on said color-emissive area, whereby said signal generating indicia exhibit a secondary-to-primary electron emissive-ratio other than that of said light-emissive area.
5. A device substantially as .claimed in claim 4 wherein each of said signal generating line segments is aligned with a predetermined one of said phosphor lines of a par`- ticular color component. l
' 6. Method of differentially metalizing the light-emissive and signal-generating phosphor areas on the screen of a color-kinescope in order to endow said areas with different secondary to primary-electron emissive-ratios, said method comprising, coating said light-emissive area with a film constituted of a thermally vaporizable resinous substance, evaporating and depositing a metal onto said vaporizable resinous film and upon the exposed phosphor surfaces of said signal-generating area, and then heating said resinous film to vaporize the same and thereby to deposit the metal which was on said lm, -indirectly upon the underlying light-emissive area, 'whereby said directly and indirectly metalized areas of said screen exhibit different surface contours and hence different secondary to primary-electron emissive ratios.
` 7. Method of making a color-kinescope-screen of the type comprising) a foundation surface having discrete color-emissive and signal-generating areas thereon, said method comprising laying down crystalline phosphor particles of' a particular color-component on said lightemissive area in the form of a color-line and simultaneously laying down a line-segment constituted of crystalline Vphosphor particles on said signal-generating area, laying down a crystalline phosphor color-line and linesegrnent of another color component in the respective ones of said areas, evaporating and depositing metal directly upon the individual crystalline faces of said phosphor line-segments whereby to endow said segments with an irregular-metal surface having a certain secondaryelectron emissive characteristic, and forming a substantially'continuous, relatively smooth, metal layerV having a 'different secondary-electron emissive characteristic over s aid light-emissive area' and in the lspace betweenv said line-segments. v 8. Method of differentially metaliz'ing the lightemis- Hsive and signal-generating crystallinephosphor areas on the screen of a color-kinescope in order to endow said areas with different` secondary to primary-electron emissive ratios, said method comprising coating both said phosphor areas with a film constituted of a thermally vaporizable resinous substance, masking only said film covered signal-generating areaevaporating and depositing metal upon said film covered light-emissive area, removing said mask, heating said resinous film to vaporixe the same whereby said evaporated metal is deposited upon said light-emissive phosphor area in the form of a lightreecting surface and whereby to expose the crystalline phosphor face of said signal-generating arca, then masking said metal covered light-emissive area, evaporating and depositing metal directly upon the exposed crystalline phosphor faces of said signahgenerating area and nally unmasking said light-emissive area, whereby said directly and indirectly metalized areas of said screen possess different surface contours and hence exhibit different primary to secondary-electron emissive ratios,
References Cited in the ile of this patent UNITED STATES PATENTS 618,672 Henry Ian. 31, 1899 2,157,749 Du Mont May 9, 1939 2,186,393 Ring et al. Jan. 9, 1940 Le Van Dec. 31, Law Mar. 4, Leverenz Feb. 9, Schaefer Apr. 24, Zworykin Jan. 28, Swedlund Aug. 3, Schroeder Aug. 10, McGee Dec. 7, Geer Sept. 6, Goldsmith Sept. 13, Huiman Dec. 13, Parker Feb. 28, Sziklai Aug. 8, Hurnan Nov. 21, Huffman Mar. 18, Muller Mar. 3,
US146297A 1950-02-25 1950-02-25 Dual-area target electrodes and methods of making the same Expired - Lifetime US2705764A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US146297A US2705764A (en) 1950-02-25 1950-02-25 Dual-area target electrodes and methods of making the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US146297A US2705764A (en) 1950-02-25 1950-02-25 Dual-area target electrodes and methods of making the same

Publications (1)

Publication Number Publication Date
US2705764A true US2705764A (en) 1955-04-05

Family

ID=22516731

Family Applications (1)

Application Number Title Priority Date Filing Date
US146297A Expired - Lifetime US2705764A (en) 1950-02-25 1950-02-25 Dual-area target electrodes and methods of making the same

Country Status (1)

Country Link
US (1) US2705764A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848358A (en) * 1955-03-24 1958-08-19 Rca Corp Method of making ray sensitive targets
US2939033A (en) * 1957-10-22 1960-05-31 Varian Associates Cathode and method of making same
US3018405A (en) * 1957-08-13 1962-01-23 Sylvania Thorn Colour Television Laboratories Ltd Colour television tube
US3090888A (en) * 1959-04-13 1963-05-21 Sylvania Thorn Colour Television Laboratories Ltd Cathode ray tube viewing screen for colour television
US3247493A (en) * 1961-09-26 1966-04-19 Gen Electric Electron beam recording and readout on thermoplastic film
US3607382A (en) * 1967-10-23 1971-09-21 Heinz Henker Method of producing photovarnish masks for semiconductors
US3634713A (en) * 1969-09-08 1972-01-11 Bendix Corp Electron multiplier having means for altering the equipotentials of the emissive surface to direct electrons towards the anode
US4107570A (en) * 1973-03-12 1978-08-15 Washburn Clayton A Cathode ray tube indexing structures
US5368882A (en) * 1993-08-25 1994-11-29 Minnesota Mining And Manufacturing Company Process for forming a radiation detector

Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US618672A (en) * 1899-01-31 Charles henry
US2157749A (en) * 1938-01-11 1939-05-09 Du Mont Allen B Lab Inc Method and system for television communication
US2186393A (en) * 1936-10-26 1940-01-09 Ring Friedrich Fluorescent screen
US2226567A (en) * 1937-09-04 1940-12-31 Raytheon Production Corp Fluorescent coating
US2233786A (en) * 1939-11-29 1941-03-04 Rca Corp Fluorescent screen assembly and method of manufacture
US2310863A (en) * 1941-01-25 1943-02-09 Rca Corp Luminescent screen
US2374310A (en) * 1941-06-27 1945-04-24 Gen Electric Method of producing solids of desired configuration
US2415059A (en) * 1944-10-13 1947-01-28 Rca Corp Television system
US2446440A (en) * 1947-01-28 1948-08-03 Rca Corp Color television tube
US2446791A (en) * 1946-06-11 1948-08-10 Rca Corp Color television tube
US2455513A (en) * 1945-10-06 1948-12-07 Emi Ltd Manufacture of mosaic screens
US2480848A (en) * 1944-07-11 1949-09-06 Geer Charles Willard Color television device
US2481839A (en) * 1944-08-05 1949-09-13 Rca Corp Color television
US2490812A (en) * 1946-01-03 1949-12-13 Du Mont Allen B Lab Inc Control for color television
US2498705A (en) * 1947-07-02 1950-02-28 Int Standard Electric Corp Electronic color television
US2518200A (en) * 1947-10-03 1950-08-08 Rca Corp Television system
US2530431A (en) * 1946-01-03 1950-11-21 Du Mont Allen B Lab Inc Color device for utilizing control signals
US2589386A (en) * 1947-12-02 1952-03-18 Allen B Dumont Lab Inc Pickup device for color television
US2630548A (en) * 1937-12-04 1953-03-03 Muller Egon Nicolas Cathode-ray system

Patent Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US618672A (en) * 1899-01-31 Charles henry
US2186393A (en) * 1936-10-26 1940-01-09 Ring Friedrich Fluorescent screen
US2226567A (en) * 1937-09-04 1940-12-31 Raytheon Production Corp Fluorescent coating
US2630548A (en) * 1937-12-04 1953-03-03 Muller Egon Nicolas Cathode-ray system
US2157749A (en) * 1938-01-11 1939-05-09 Du Mont Allen B Lab Inc Method and system for television communication
US2233786A (en) * 1939-11-29 1941-03-04 Rca Corp Fluorescent screen assembly and method of manufacture
US2310863A (en) * 1941-01-25 1943-02-09 Rca Corp Luminescent screen
US2374310A (en) * 1941-06-27 1945-04-24 Gen Electric Method of producing solids of desired configuration
US2480848A (en) * 1944-07-11 1949-09-06 Geer Charles Willard Color television device
US2481839A (en) * 1944-08-05 1949-09-13 Rca Corp Color television
US2415059A (en) * 1944-10-13 1947-01-28 Rca Corp Television system
US2455513A (en) * 1945-10-06 1948-12-07 Emi Ltd Manufacture of mosaic screens
US2490812A (en) * 1946-01-03 1949-12-13 Du Mont Allen B Lab Inc Control for color television
US2530431A (en) * 1946-01-03 1950-11-21 Du Mont Allen B Lab Inc Color device for utilizing control signals
US2446791A (en) * 1946-06-11 1948-08-10 Rca Corp Color television tube
US2446440A (en) * 1947-01-28 1948-08-03 Rca Corp Color television tube
US2498705A (en) * 1947-07-02 1950-02-28 Int Standard Electric Corp Electronic color television
US2518200A (en) * 1947-10-03 1950-08-08 Rca Corp Television system
US2589386A (en) * 1947-12-02 1952-03-18 Allen B Dumont Lab Inc Pickup device for color television

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848358A (en) * 1955-03-24 1958-08-19 Rca Corp Method of making ray sensitive targets
US3018405A (en) * 1957-08-13 1962-01-23 Sylvania Thorn Colour Television Laboratories Ltd Colour television tube
US2939033A (en) * 1957-10-22 1960-05-31 Varian Associates Cathode and method of making same
US3090888A (en) * 1959-04-13 1963-05-21 Sylvania Thorn Colour Television Laboratories Ltd Cathode ray tube viewing screen for colour television
US3247493A (en) * 1961-09-26 1966-04-19 Gen Electric Electron beam recording and readout on thermoplastic film
US3607382A (en) * 1967-10-23 1971-09-21 Heinz Henker Method of producing photovarnish masks for semiconductors
US3634713A (en) * 1969-09-08 1972-01-11 Bendix Corp Electron multiplier having means for altering the equipotentials of the emissive surface to direct electrons towards the anode
US4107570A (en) * 1973-03-12 1978-08-15 Washburn Clayton A Cathode ray tube indexing structures
US5368882A (en) * 1993-08-25 1994-11-29 Minnesota Mining And Manufacturing Company Process for forming a radiation detector

Similar Documents

Publication Publication Date Title
US3114065A (en) Color image reproducer
US2959483A (en) Color image reproducer and method of manufacture
US3293474A (en) Phosphor dielectric storage target for cathode ray tube
US2705764A (en) Dual-area target electrodes and methods of making the same
US3569761A (en) Color phosphor electroluminescent screen with filters for color cathode-ray display tubes
US3294569A (en) Luminescent screens utilizing nonluminescent separator layers
US2702274A (en) Method of making an electrode screen by cathode sputtering
US4551652A (en) Display screen having aluminum phosphate barrier layer and method of manufacture
US4717856A (en) Cathode ray tube having an aluminum oxide film over a black matrix
US3005125A (en) Display screen
US3481733A (en) Method of forming a cathodo-luminescent screen
GB857451A (en) Improvements in and relating to image-reproducing cathode ray tube apparatus
US2544690A (en) Color television
GB761180A (en) Method of manufacturing the screen structure of cathode ray tubes
US3231775A (en) Cascaded phosphor layers for color display including one of discrete coherent particles
US3651362A (en) Screens for cathode ray tubes with discrete phosphor layers
US2744837A (en) Photo-conductive targets for cathode ray devices
US2960416A (en) Method of manufacturing screens for electron-discharge devices
US3692576A (en) Electron scattering prevention film and method of manufacturing the same
US3582701A (en) Color tube screen with light-absorbing cermet deposits
US3695871A (en) Method of screening a color image reproducing device
US4188562A (en) Color display tube and method of manufacturing such a color display tube
US2178238A (en) Electric discharge device
US2729583A (en) Method of fabricating electrical apparatus
US5039551A (en) Method of manufacturing a phosphor screen of a cathode ray tube