US2711690A - Method of making a television screen - Google Patents
Method of making a television screen Download PDFInfo
- Publication number
- US2711690A US2711690A US231978A US23197851A US2711690A US 2711690 A US2711690 A US 2711690A US 231978 A US231978 A US 231978A US 23197851 A US23197851 A US 23197851A US 2711690 A US2711690 A US 2711690A
- Authority
- US
- United States
- Prior art keywords
- stencil
- screen
- printing
- pattern
- ray
- 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
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Classifications
-
- 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
- H01J9/2277—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines by other processes, e.g. serigraphy, decalcomania
Definitions
- This invention relates to cathode-ray tubes of the kind containing a dot-like or linelike beam-target and to irnprovements in the art of printing such targets.
- the repetitive (dot or line) ray-sensitive patterns on the target plates of present-day tri-color television tubes are usually laid down, one color at a time, by the so-called silk screen printing process.
- Another and important object of the invention is to provide an improved,colortelevision tube and one characterized (a) by its substantial freedom from moir effects, ⁇ (b) by the uniform brilliance of its colors and (c) by its high electron-optical resolution.
- a stencil wherein the lines or rows of openings through which the paint or ink passes are disposed at an angle with respect to the warp and weft strands of the metal (or silk) fabric upon which the stencil is supported. As will hereinafter more fully appear, this angle is different for different (dot or line) patterns.
- Fig. 1 is a broken away view in perspective showing a plate to be printed, and a portion of a printing screen comprising a fabric-supported stencil containing a repetitive dot-like pattern of apertures disposed at an acute angle with respect to the warp and weft strands of the fabric in the manner dictated by the present invention;
- Fig. 3 is a longitudinal sectional view of a printing screen disposed above its initial printing position on a glass plate;
- FIG 4 is a View similar to Fig. 3 showing the printing screen removed from the second printing position dictated by the present invention and,
- Fig. 5 is a broken away view in perspective of a color television tube of the maskedscreen variety, incorporating the invention.
- FIG. 1 designates generally the glass foundation plate of a television screen and 2 designates a gelatin, lacquer or similar stencil used in printing a repetitive ray-sensitive pattern on the target surface of said plate.
- the stencil is bonded to or otherwise supported upon a silk or metal gauze screen 3, which in turn, is supported upon a suitable wood or metal frame 4.
- the stencil shown in Fig. l contains a large number (say 2,000 per square inch) of circular holes 5 arranged in the repetitive hexagonal pattern used in the television screen of the Law application, Serial No. 158,901 (U. S. Patent 2,625,734).
- the holes are spaced from each other a distance not less than the diameter of a single hole and are arranged in vertical and horizontal rows 5a and 5b, respectively, so that each hole (except the ones on the borders of the pattern) is surrounded by six other holes.
- the present invention teaches that the moir effect normally present in repetitive patterns laid down (as on'the glass plate 1) by the sillt-screen7 process is minimized when the rows Sa and 5b of stencil apertures are disposed at an angle 0 with respect to the warp and weft strands 3a, 3b, respectively, of the fabric 3 upon which the stencil 2 ⁇ is supported.
- the stencil apertures comprise discrete dot-like holes 5 the maximum reduction in the moir effect is achieved when the angle 0 is approximately 7.
- the angle 0 is greater than 10 or less than 5
- the effect becomes increasingly noticeable to one observing the printed pattern.
- the apertures in the stencil 2 comprise a multiplicity (say 1500) of equally spaced, parallel, line-like openings 5c, Which extend across the fabric screen 3 between opposite sides of the frame 4.
- This pattern of stencil apertures is useful in laying down ray-sensitive, line-like, target patterns similar to the ones shown in Fig. 2 of the Ruden'oerg patent (USP 1,934,821) and in the Bond disclosure (U. S. Patent 2,689,926).
- the invention teaches that the maximum reduction in moir is achieved when the line-like stencil openings 5c form an angle (0) of 45, plus or minus, say, 2, with respect to the warp and weft strands 3a, 3b of the fabric 3 upon which the stencil 2 is supported.
- the patterns printed through such a stencil may nevertheless exhibit certain other defects.
- the dots (or parts of the lines) may not all exhibit the same brilliance or the same optical resolution when illuminated by an electron-beam.
- Such defects may usually be traced either (a) to the presence of a warp or weft strand in a masking position, say adjacent to the periphery of one or more of the stencil apertures 5, as shown at x, x Fig. 1, or (b) to some defect in the stencil per se, such as the break shown at y Fig. 2.
- Phosphor dot and line screens including tri-color screens, printed in accordance with the teachings of the present invention and illuminated by electron bombardment, are substantially free from moire effects and are further characterized by the brilliance of their colors and by their high electron-optical resolution.
- Fig. 5 shows such a tri-color dot-like screen ⁇ used as the ,target of a cathode-ray tube of the Goldsmith (U. S. Patent 2,630,542) masked-target" variety.
- the screen which is here designated 10, is provided on its rear or target surface with a multiplicity, say, 600,000. of phosphor dots 'R (red), B (blue), G (green) of different color-emissive characteristics.
- the dots are arranged in a hexagonal pattern in triads or groups-of-three (thus, each dot is surrounded by six other dots).
- the dots will be understood to have been laid down or printed, one color at a time, through the printing screen 2 3 of Fig. 1, said screen being-shifted between printings to a position whereat the stencil openings are tangent to the previously applied dots.
- an apertured mask 11 is disposed in front of the target surface ofthe screen 10.
- the rnask 11 comprises a thin mtal plate containing 200,000 holes, i. e., one hole foreach of the tri-color dot groups.
- the phosphor-dot screen and apertured mask 11 are here shown'mounted in the viewing chamber 12 of a kinescope 13 of the 3-g ⁇ un variety.
- the three guns which-are designated 15, 16 and 17 are mounted deltafashion about and along the central axis ofthe tube,in the manner disclosed in copending application Serial No. 166,416 of Hannah C. Moody.
- the paths of the electron-beams r, -16b and 17g converge in the 'plane of themask-ll where their paths cross and proceed in diverging straight lines to the screen 10. Thus, each beam irnpinges upon a different color dot.
- each beam produces a distinctively colored monochromatic image on the screen 10.
- These three distinctively colored images appear, to the eyes of the observer, as a single polychroniatic additive image, which, as previously set forth, is substantially free from moir and other defects characteristic of the mosaic type television screens ofthe prior art.
- Method of making -a television-'beam target of the kind provided with a target surface having printed thereon a repetitive pattern consisting of rows of ray-sensitive areas comprising; making a stencil with apertures disposed in rows corresponding to the desired pattern, mounting said stencil upon a fabric base with the warp and weft strands of said fabric disposed at an'a'ngle other than a right angle with respect to said rows of apertures, applying a rst serving of ray-sensitive material to discrete areas on said target 'surface through said fabric and stencil apertures, shifting said fabric supported stencil to a position whereat its apertures are in register with respectively different ones of said discrete ray-sensitive areas, and then applying a second serving of said ray-sensitive material to said areas through said apertures.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Printing Plates And Materials Therefor (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
- Printing Methods (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NLAANVRAGE7213783,A NL170351B (nl) | 1951-06-16 | Inrichting voor het verbinden van een draad aan een contact van een rij contacten langs een elektrisch verbindingsorgaan. | |
US231978A US2711690A (en) | 1951-06-16 | 1951-06-16 | Method of making a television screen |
FR1056420D FR1056420A (fr) | 1951-06-16 | 1952-04-25 | écran de télévision |
GB14732/52A GB722213A (en) | 1951-06-16 | 1952-06-11 | Improvements in cathode-ray tubes |
DER9256A DE942275C (de) | 1951-06-16 | 1952-06-14 | Verfahren zur Herstellung von mehrfarbigen Leuchtschirmen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US231978A US2711690A (en) | 1951-06-16 | 1951-06-16 | Method of making a television screen |
Publications (1)
Publication Number | Publication Date |
---|---|
US2711690A true US2711690A (en) | 1955-06-28 |
Family
ID=22871395
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US231978A Expired - Lifetime US2711690A (en) | 1951-06-16 | 1951-06-16 | Method of making a television screen |
Country Status (5)
Country | Link |
---|---|
US (1) | US2711690A (fr) |
DE (1) | DE942275C (fr) |
FR (1) | FR1056420A (fr) |
GB (1) | GB722213A (fr) |
NL (1) | NL170351B (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0194724A1 (fr) * | 1985-03-14 | 1986-09-17 | Koninklijke Philips Electronics N.V. | Tube image couleur |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1456794A (en) * | 1919-12-09 | 1923-05-29 | Gestetner Ltd | Printing and duplicating |
GB497194A (en) * | 1937-01-05 | 1938-12-12 | Ig Farbenindustrie Ag | Process for influencing moire effects in photo-mechanical printing processes |
US2209499A (en) * | 1936-10-17 | 1940-07-30 | Charles A Wulf | Stencil screen and method of making the same |
US2310863A (en) * | 1941-01-25 | 1943-02-09 | Rca Corp | Luminescent screen |
US2508267A (en) * | 1945-10-26 | 1950-05-16 | Du Mont Allen B Lab Inc | Color television |
US2633426A (en) * | 1950-07-07 | 1953-03-31 | Gen Electric | Method of forming a powder coating on a surface |
-
0
- NL NLAANVRAGE7213783,A patent/NL170351B/xx unknown
-
1951
- 1951-06-16 US US231978A patent/US2711690A/en not_active Expired - Lifetime
-
1952
- 1952-04-25 FR FR1056420D patent/FR1056420A/fr not_active Expired
- 1952-06-11 GB GB14732/52A patent/GB722213A/en not_active Expired
- 1952-06-14 DE DER9256A patent/DE942275C/de not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1456794A (en) * | 1919-12-09 | 1923-05-29 | Gestetner Ltd | Printing and duplicating |
US2209499A (en) * | 1936-10-17 | 1940-07-30 | Charles A Wulf | Stencil screen and method of making the same |
GB497194A (en) * | 1937-01-05 | 1938-12-12 | Ig Farbenindustrie Ag | Process for influencing moire effects in photo-mechanical printing processes |
US2310863A (en) * | 1941-01-25 | 1943-02-09 | Rca Corp | Luminescent screen |
US2508267A (en) * | 1945-10-26 | 1950-05-16 | Du Mont Allen B Lab Inc | Color television |
US2633426A (en) * | 1950-07-07 | 1953-03-31 | Gen Electric | Method of forming a powder coating on a surface |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0194724A1 (fr) * | 1985-03-14 | 1986-09-17 | Koninklijke Philips Electronics N.V. | Tube image couleur |
Also Published As
Publication number | Publication date |
---|---|
GB722213A (en) | 1955-01-19 |
NL170351B (nl) | |
DE942275C (de) | 1956-05-03 |
FR1056420A (fr) | 1954-02-26 |
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