CA1222790A - Television tube with optional shadow mask and method of manufacture - Google Patents
Television tube with optional shadow mask and method of manufactureInfo
- Publication number
- CA1222790A CA1222790A CA000436531A CA436531A CA1222790A CA 1222790 A CA1222790 A CA 1222790A CA 000436531 A CA000436531 A CA 000436531A CA 436531 A CA436531 A CA 436531A CA 1222790 A CA1222790 A CA 1222790A
- Authority
- CA
- Canada
- Prior art keywords
- ink
- panel
- color
- mask
- inks
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000007639 printing Methods 0.000 claims abstract description 28
- 239000002253 acid Substances 0.000 claims abstract description 19
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical class [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000976 ink Substances 0.000 claims description 93
- 239000011159 matrix material Substances 0.000 claims description 30
- 229920001169 thermoplastic Polymers 0.000 claims description 17
- 239000004416 thermosoftening plastic Substances 0.000 claims description 17
- 238000005530 etching Methods 0.000 claims description 16
- 238000000151 deposition Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 8
- 230000008021 deposition Effects 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 239000012943 hotmelt Substances 0.000 claims description 7
- 239000004063 acid-resistant material Substances 0.000 claims description 6
- 229920001187 thermosetting polymer Polymers 0.000 claims description 5
- 239000000969 carrier Substances 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000001747 exhibiting effect Effects 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 claims description 2
- 230000000875 corresponding effect Effects 0.000 claims 6
- 239000012815 thermoplastic material Substances 0.000 claims 2
- 230000002708 enhancing effect Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 238000002844 melting Methods 0.000 claims 1
- 150000002894 organic compounds Chemical class 0.000 claims 1
- 238000007645 offset printing Methods 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 description 9
- 229920001296 polysiloxane Polymers 0.000 description 8
- 239000007787 solid Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- KUBDPQJOLOUJRM-UHFFFAOYSA-N 2-(chloromethyl)oxirane;4-[2-(4-hydroxyphenyl)propan-2-yl]phenol Chemical compound ClCC1CO1.C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 KUBDPQJOLOUJRM-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/003—Printing processes to produce particular kinds of printed work, e.g. patterns on optical devices, e.g. lens elements; for the production of optical devices
-
- 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
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
- H01J9/142—Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes
- H01J9/144—Mask treatment related to the process of dot deposition during manufacture of luminescent screen
Abstract
Abstract of the Invention TV bulb components and their method of manufacture are disclosed. A collector printing process is utilized for applying TV phosphor compounds with associated black background to the inner face of the TV panel. Also, an offset printing process is utilized for printing an acid resist ink on both sides of a TV aperture mask after it has been formed into an approximate spherical or cylindrical shape. Masks and panels produced in accordance with the present invention are interchangeable during bulb manufacture.
Description
79~
TELEVISION' TUBE WITH OPTIONAL SHADOW MASK AND
METHOD OF MANUFACTU~E
'Backgrouhd 'o'f''khe''In~e'n'tion - The in~ention relates to a TV picture tube components and their method of manufacture. More par~icularly, there is provided a color TV picture tube panel having a black matrix and color phosphors printed thereon, and an optional mask produced by a printing technique. Preferably, a collector silicone process is utilized for applying a target comprising color phosphor compounds and a black matrix onto the inner face of the cur~ed TV panel. The shadow mask is produced using a new process wherein acid resist is applied by an offset printing technique.
In a conventional color TV bulb, the black matrix background and color phosphors of the target are separately applied to ~he panel in a succession of relati~ely complex process steps. The process requires the use of a mask having apertures formed therein by a photo-etch process. The mask is thereafter stamped into shape. The mask and panel are mated and become a unique combination for the particular TV bulb.
In the preferred process of the present invention, a resist ink pattern is printed on both sides of the mask after it has been formed into the desired spherical or cylindrical shape. The mask may be thereafter etched. Because forming takes place be~ore etching, the structure is not subjected to significant deformations after the apertures are in place.
Thus, the possibility exists that masks can be construct2d which are interchangeable with various panels of similar manufacture.
~222 ~9~
In the present invention, the application of the target onto the panel is reduced to a single step. The color phosphors and background inks are printed onto a silicone collector in the pattern of the target. Thereafter, the target may be printed from the collector onto the panel. A
major advantage of the collector process is that registration is accomplished on the collector independently of the panel.
The process herein described is compatible with conven-tional TV tubes having a shadow mask and more recently devel-oped TV tubes of the beam-indexing type (i.e. maskless picture tubes).
_mmary of the Invention A color TV panel and method of manufacture is disclosed wherein a collector printing process is utilized for printing the target, comprising color phosphors and black matrix inks, onto the TV panel.
A preformed shadow mask is printed on both sides with a coating of an acid resist ink in a selected pattern. The mask is then acid treated. Portions of the mask not coated with the ink dissol~e, thereby producing an aperture array in the mask corresponding to the selected patterns.
The inks are specially formulated thermoplastic pressure æensitive media. Masks and panels produced in accordance with the present invention are interchangeable.
Thus the present inven~ion provides, in a color TV
bulb, a panel comprising: a screen and an array of background ma~rix and color phosphors in a selected pattern. The pattern is deposited on an interior surface of the screen simultaneously as a cohesive film of pressure-sensi~ive, thermoplastic inks, one for each color phosphor and the background matrix. The inks have organic and inorganic components ana are combined in the selected pattern prior to deposition onto the screen. The inks ~222J~
are hereafter fired to volatilize the organic components and to fix the inorganic components to the screen of the panel.
In another aspect the present invention provides a method of producing a color TV bulb having a panel and funnel fused together in a conventional manner in which the panel has a composite of a black matrix pattern and respective red, blue and green color phosphor patterns deposited thereonu The method comprises the s~eps of formulating separate thermoplastic ink compositions for each of the black matri~
and color phosphors, said inks exhibiting cohesive strength and pressure sensitivity at near room temperaturei forming each composition into a corresponding separate pattern;
establishing the black matrix and respective color phosphors in separate ink patterns on separate carriers from the separ-ate inks; comple~ely transferring and registrably combining the separate patterns into the composite onto at least one collector; and completely transferring the composite from the collector to the panel.
In another aspect the present invention provides an interchangeable aperture mask for a color TV panel and having apertures formed therein by acid etching. rrhe mask includes a mask portion having front and back sides bound by a peripheral margin and being formed into a desired shape.
The front and back sides of the mask portion are registrably printed with a respective pattern, each pattern being formed of an acid resistant hot-melt material for coating selected portions of the mask portion. The registrably printed pattern for each of the front and ~ack mask portion in the same relative position front to back, such that, upon etching the apertures are formed in the mask portion in the uncoated areas as through holes; the aperture mask having the acid resistant material and acid removed after etching.
- 2a -~27~) n ~ nother aspect the present invention provides ~ me.:hod of p~oducing a target for a color TV panel formed of separate pat~erns corresponding to a background matrix and respective color phosphors comprising the steps of:
establishing separate patterns of each of the background matrix and color phosphors onto separate surfaces, collecting the separate patterns in registration on~o a common surface as a composite pattern; and transferring the entire composite pattern onto the panel by intimate contact of the common surface and the panel in a single pass for forming the target on the panel.
In still a further aspect the present invention provides a color TV panel comprising a screen and a target formed of an array of background matrix and color phosphors affixed thereto in a selected pattern. The pattern is deposited on an interior surface of the screen portion as a cohesive film of pressure-sensitive, hot melt inks, one ink for each color phosphor and the background matrix. The inks have organic and inorganic components and are combined in the selected pattern prior to deposi~ion onto said screen and thereafter are fired to thereby volatilize the organic components and ~ix the target onto the screen.
In a broad method aspect the present invention provides a method of making a cathode-ray tube which comprises a panel and a screen within an array of background matrix and color phosphors in a selected pattern, and a target, comprising the steps of depositing said screen pattern on the interior surface of said screen simultaneously as a cohesive film of pressure-sensitive, thermoplastic inks, one for each color phosphor and the background matrix, the inks having organic and inorganic components and being combined in the selected - 2b -9~
pattern prior to deposition on said screen, and then firing the inks to volatilize the organic components and to fix the inorganic components to the screen of said panel.
Descript.ion of the Drawings FIG. 1 is a schematic representation oE a collector printing process adapted for use in the present invention.
FIGS. 2a, 2b, and 2c are sequential drawings showing printing from a flexible membrane to the inside of a color TV panel.
FIG. 3 is a schematic plan view of the panel with an exemplary few triads of color dots and a portion of the black matrix illustrated.
FIG. 4 is a fragmented schematic representation in side section of a printing apparatus and a preformed and framed shadow mask.
FIG. 5 shows an alternate method of printing opposite sides of a shadow mask using flexible membrane printing.
FIG. 6 is a schematic representation of the shadow mask aftr printing.
FIG. 7 shows the shadow mask of FIG. 6 after etching and cleaning.
FIG. 8 is a fragmented front view of the shadow mask of the pxesent invention before and after etching.
FIG. 9 schematically illustrates a TV picture tube produced from components manufactured in accordance with the techniques described herein.
Description of the Preferred Embodiment .
Panel Manufacture The present invention uses separately formulated inks to print the target of a TV panel. The inks comprise a heat-processable, thermoplastic, pressure-sensitive, hot-~22~9~
melt medium mixed with a selected pigment. The preferred medla melt when heated above room temperature forms cohes,-~e, pressure-sensitive, tacky films when cooled to near room temperature. The pigments are conventional materials used in the TV industry, namelyo green, red, and blue phosphors for the colors and a black graphite for the black matrix or background.
-, A preferred printing device is a gravure printer including collector; transfer surfaces; and corresponding heated gravure surfaces, which receive melted thermoplastic, pressure-sensitive ink from separate heated supplies.
Each gravure surface has a different recessed gravure pattern etched therein for receiving a corresponding ink from its separate supply. Because the gravure surface is heated, the inks remain melted when in contact therewith.
The corresponding transfer surface is formed of an elasto-meric silicone material and contacts the hot fluid ink in the recessed gravure pattern. The ink splits almost evenly between the two surfaces, leaving an impression of the pattern on the transfer surface. The ink immediately cools upon contact with the transfer surface and forms a cohesive, pressure-sensitive, tacky film. The transfer surface, carrying the tacky film, is intimately contacted with the collector formed of an elastomeric silicone material. The ink transfers completely from the transfer surface to the collector.
The separate patterns developed by the separate gravure surfaces are printed on the collector in registration. This means that each separate ink pattern is printed on the col-lector in a specific geometric relation with each of theother ink patterns. Registration is accomplished by align-ment of the components. When all of the inks are printed on ~Z~7~
the collector in the proper relation, the target is estab-lished. Once established, the target may be completely transferred to the panel by intimate contact of the collector with said panel.
The complete and successive transfer of the separate inks occurs for a number of reasons. The inks are tacky.
They tend to stick to almost anything they come in contact with~ The respective transfer surface, the collector and the panel are formulated so that they each have increasing affinity for the inks. The inks form cohesive films when cool. Thus, when transfer occurs, it is complete because the film holds together. The films neither split nor tear.
FIG. 1 is a schematic drawing exemplary of a printing device 10. The present invention utilizes at least four printing stations I-IV, one for each color phosphor and one for the black matrix. Each printing station I-IV includes:
a heated ink trough 18; a heated gravure roll 12 and a transfer roll 14 mounted in pairs 13 on base plate 11 by means not shown;
and a doctor blade 22. A turret 19, mounted for rotation about a central axis C, carries collectors 16 in holders 20.
Each collector 16 includes a flexible silicone membrane 26 secured in a frame 28. Each ink trough 18 carries a separate ink formulation for deposition onto a gravure roll 12 (e.g., M-black matrix, R-red, G-green, and B-blue)O
Each gravure roll 12 has a selected pattern etched therein. For example, at station I gravure roll 12 has a pattern P-M corrsponding to the desired configuration of ~2227~3 the black matrix. The hlack ink M carried in heated trough 18 is a melted, graphite filled, thermoplastic fluid. The ink ~l, deposited on gravure roll 12 a~ station I, is doctored in a conventional manner by blade 22. Ink M in pattern P-M
on gravurs roll 12 is carried into intimate contact with transfer roll 14, whereupon the ink M is split between such rolls. The ink M, deposited onto cool transfer roll 14, forms a tacky cohesive film 24M wherein the pattern P-M is reproduced on transfer roll 14. The film 24M is brought into intimate contact with collector 16. In this instance, the ink M forming the film 24M does not split, but completely transfers from the transfer roll 14 to the collector 16.
The pattern P-~, generated on gravure roll 12, is thereby formed on collector 16 as film 24M'.
The above process is repeated at stations II, III and IV for the remaining inks R, G, and B. Respective patterns P-R, P-G and P-B are reproduced in the corresponding collector 16 as films 2gR', 24G' and 24B' and deposited in registration onto the collector 16 as a composite film 24. There is no print back from any collector 16 to any of the transfer rolls 14. The collector has a higher affinity for the ink than the transfer rolls 14.
The collector 16, carrying the composite film 24, is removed from holder 20 and is locked in position within a TV
panel 30 by means not shown (see FIG. 2a). Flexible plunger 32 engages a re~r side 34 of membrane 26, urging the membrane 26 and film 24 carried thereby against an inside surface 38 of panel 30 (see Fig. 2b). The film 24 preferentially adheres to the inside surface 38 of panel 30. The plunger 32 is thereafter withdrawn. The membrane 26 relaxes and 279i[1 peels away from the film 24 which forms target 24' (see FIG.
2c).
In FIG. 3 an illustrative portion of target 24' is shown. The target 24' comprises black matrix 40 and triads 41 formed of a green dot 42G, a red dot 42R and a blue dot 42B. The black matrix 40 corresponds to the pattern P-M
generated by gravure roll 12 at station I using ink M. The dots 42R, 42G and 42B correspond respectively to the patterns P-R, P-G, and P-B generated at stations II-IV.
The target 24' is finished with an organic sealant 46 and sputtered aluminum reflective conductive coating 48.
The panel 30 is fired, and the organic materials forming the various ink media are burned off. The inorganic pigments forming the target ~4', and the aluminum coating 18 are fixed to the panel 30.
In another embodiment, the collector 16 may be a ~iber-glass reinforced silicone blanket ~not shown). Also transfer of the film 24 to the panel 30 may be effected by applying pressure with a cut roll (not shown~ on the opposite side of the membrane 34 on the blanket.
Aperture Mask Manufacture FIGS. 4-8 illustrate aperture mask printing and manu-facture. Resist inks are deposited on the mask after it is ormed in the required shape. Resist inks utilized may be pressure-sensitive hot-melt inks which exhibït sufficient adhesion and acid resistance to serve as satisfactory acid resists in their cooled ambient state. The inks may be pressure-sensitive hot-melt inks which are capable of cross-linking or curing to enhance their acid resistance. Latent 30catalysts may be added to the inks, which catalysts are ~:2279() selected not to induce curing at temperatures below about 300F. Once curing occurs, the inks may be referred to as thermoset materials. Waxes may also be employed as suitable resist inks.
A member that prints the resist ink onto the mask may be a roll, blanket, membrane, or pad, havîng a silicone working surface. Gravure or flexographic techniques may be useful. The mask receives the resist in]c directly from a heated metal inking surface, or through an intermediate offset or transfer roll. Transfer of the ink to the mask is effected by causing intimate mechanical contact between the mask and the transfer member carrying the ink. Intimate contact may be accomplished by urging the transfer member against the metal surface of the mask.
In FIG. 5, there is illustrated a fragmented side view of an aperture mask 110 having a preformed cylindrical or spherical shadow mask portion 112 and peripherally attached frame 11~. The frame 114 may be an internally formed bead, as shown, or a separately welded ring. The shadow mask portion 112 has respective front and back sides 113 and 115, each of which receives a printed coating as hereafter described.
In the present invention an offset gravure printing apparatus 120 is disclosed for printing the respective front and back sides 113 and 115 of the mask 110. The printing apparatus 120 requires similar elements for printing the respective front and back sides 113 and 115 of the mask 110.
Such similar elements, hereinafter described, will be referred to by the same descriptive name but with the reerence numerals in the elements used to print the back side 115 of mask 110 being primed counterparts of the elements used for printing the front slde 113 thereof.
The printing apparatus 120 includes heated gravure rolls 122-122', heated troughs 124-124', melted thermo-plastic ink 126 ~the same material for both sides~ in heated troughs 124~124', doctor blades 128-128' and silicone elastomeric offset rolls 130-130'. A surface 132-132' of each gravure roll 122-122' is etched or engraved with a pattern PG-PG'. The ink 126 is deposited on each gravure lC roll 122-122' and any excess is removed in a known manner by corresponding doctor blade 128-128'. The ink 126 remaining on each roll 122-122' forms a film 134-134' in a pattern corresponding to the etchings PG-PG' in each respective gravure roll 122-122'.
Although exaggerated ;n thickness and the dimensions, each film 134-134' has respective solid portions 138-138' and aperture portions 140-140'. Each offset roll 130-130' contacts the corresponding gravure roll 122-122' as shown, and picks up the film 134-134' hy split.ting action (see reference numerals 135-135'). Each oEfset roll 130-130' is preferably cool. The film 134-134', freezes upon contact with the offset roll 130-130' thereby forming a xespective patterned cohesive film 136-136' thereon.
The ink 126 forming cohesive films 136-136 7 iS tacky at near room temperature. Each cohesive film 136-136' is transferred completely from the corresponding offse~ roll 130-130' to the respective front and back side 113 and 115 of aperture mask 110 upon intimate contac-t (see reference numerals 137-137'~. The offset rolls 130-130' act as mutual ~22Z79~
backing members as mask 110 is passed therebetween during the printing operation.
The offset roll 130', used for printing the back side 115 of mask 110, has a cut 141' formed thereinO Cut 141' allows the offset 130' to clear the frame 114. Also the offset roll 130' may be oriented so that a leading edge 143' of the cut 141' engages the back side 115 of mask 110 near where the frame 114 and mask portion 112 meet at inside corner 145'.
In another preferred embodiment, plain inking rolls may be substituted for gravure rolls 122-122', and raised patterned flexographic rolls may be substituted for offset rolls 130-130'.
In FigO 5 the aperture mask 110 may be printed using flexible blankets or membranes as collectors 150-150'.
Respective cohesive films 136-136' may first be deposited into collectors 150-150' by a gravure process. Each cohesive film 135-136' may thereafter be deposited on the respective front and back sides 113 and 115 of mask by urging the collectors 150-150' and the respective cohesive films 136-136' into intimate contact with opposite front and back sides 113 and 115 of the mask 110. Opposed rolls 154-154' urge the respective collectors 150-150' against the mask 110. The rolls 150-150' act as complimentary backing members for each other. The roll 154' may have cut 151' for allowing it to clear frame 114. The cohesive films 136-136' have a greater affinity for the mask 110 than respective collectors 150-150' and thus transfer to the mask 110 as integral cohesive films.
~;~227~) In FIG.6 the cohesive films 138-138' are shown after deposition onto the opposite sides 113 and 115 of the mask 110. The cohesive films 136-136' are printed onto the shadow mask portion 112 so that solid portions 138-138' from coated areas 159-159' and aperture portions 140-140' leave uncoated areas 160-160'. The respective aperture portions 140-140' and solid portions 138-138' are in alignment or registration. The respective unsoated portions 160-160' of the mask 110 are aligned in registration, one opposite the other, on the respective front and back sides 113 and 115 of the mask 110. Thus, the exposed portions 160-160' are subjected to acid etching whereby through holes 170 may be made (see FIG. 7)O
In FIG. 8 the aperture mask 110 is shown in two frag-mented parts of a fron~ elevation. In the upper part of the drawing, prior to acid etching, the cohesive film 138 is shown deposited onto the front side 113 of the aperture mask 110 with exposed portions 160 of the same shown as darkened circles. In the lower portion of the drawing, after acid etching, the exposed portions 160 of the aperture mask 110 - have been dissolved, creating holes or apertures 170 therein, shown as open circlesO It should be understood that the etching takes place from both sides of the aperture mask 110. Once etching is complete, the aperture mask 110 is thoroughly cleaned and rinsed for removing acid and ink therefrom (see FIG. 7)O The interchangeable aperture mask 110 of the present invention is thus complete~.
~L2;2~7~{1 A preferred ink 126 is disclosed in the following example.
Material Parts/Wt.
EPON 1001 (Shell) 60 FC 431 (3M) Z6040 (Dow-Corning) 2 Dicyandiamide Dibutyl Phthalate 25 K745 Black (Ferro) 25 Print at between 125-175F
Cure for 1/2 hour at 300-500Fo In the example, the ink 126 is a heat processable hot melt, thermoplastic (thermosetting above 300F), pressure-sensitive material. The ink reversably melts with heat and solidifies upon cooling. It cures and becomes thermosetting once cross-linking occurs above 300F. The ink 126 may be formulated to become tacky at near room temperature so that a pressure-sensitive cohesive film may be produced. The ink 126 may also be formulated to preferentially stick to one surface over another. Thus, in the present invention, ink - 126 preferentially sticks to the mask 110 and releases from the offset rolls 130 130'. Similarly if intermediate surface carriers are used, for example, collectors 150-150', the surfaces against which the ink 126 preferentially adheres are formulated to provide adherence in a specific order~
Picture Tube Manufacture In FIG. 9 a picture tube 100 is shown schematically in side section. The tube 100 includes the panel 30 with target 24' printed thereon, ma~k 110 with an aperture pattern 106 manufactured as hereinbefore described, and a conventional o funnel 102 and gun 103. If a tube 100 is manufactured using a beam indexing gun, the mask 110 is not used. Thus, the mask 110 becomes an optional feature.
Conventional means, not shown, may be used to fix the panel 30 and mask 110 in a desired spatial relation~ Each panel 30 is interchangeable with any other mask 110 of the same model tube. That is, the respective target 24' and aperture pattern 106 are desiged to work together in a particular picture tube arrangement.
TELEVISION' TUBE WITH OPTIONAL SHADOW MASK AND
METHOD OF MANUFACTU~E
'Backgrouhd 'o'f''khe''In~e'n'tion - The in~ention relates to a TV picture tube components and their method of manufacture. More par~icularly, there is provided a color TV picture tube panel having a black matrix and color phosphors printed thereon, and an optional mask produced by a printing technique. Preferably, a collector silicone process is utilized for applying a target comprising color phosphor compounds and a black matrix onto the inner face of the cur~ed TV panel. The shadow mask is produced using a new process wherein acid resist is applied by an offset printing technique.
In a conventional color TV bulb, the black matrix background and color phosphors of the target are separately applied to ~he panel in a succession of relati~ely complex process steps. The process requires the use of a mask having apertures formed therein by a photo-etch process. The mask is thereafter stamped into shape. The mask and panel are mated and become a unique combination for the particular TV bulb.
In the preferred process of the present invention, a resist ink pattern is printed on both sides of the mask after it has been formed into the desired spherical or cylindrical shape. The mask may be thereafter etched. Because forming takes place be~ore etching, the structure is not subjected to significant deformations after the apertures are in place.
Thus, the possibility exists that masks can be construct2d which are interchangeable with various panels of similar manufacture.
~222 ~9~
In the present invention, the application of the target onto the panel is reduced to a single step. The color phosphors and background inks are printed onto a silicone collector in the pattern of the target. Thereafter, the target may be printed from the collector onto the panel. A
major advantage of the collector process is that registration is accomplished on the collector independently of the panel.
The process herein described is compatible with conven-tional TV tubes having a shadow mask and more recently devel-oped TV tubes of the beam-indexing type (i.e. maskless picture tubes).
_mmary of the Invention A color TV panel and method of manufacture is disclosed wherein a collector printing process is utilized for printing the target, comprising color phosphors and black matrix inks, onto the TV panel.
A preformed shadow mask is printed on both sides with a coating of an acid resist ink in a selected pattern. The mask is then acid treated. Portions of the mask not coated with the ink dissol~e, thereby producing an aperture array in the mask corresponding to the selected patterns.
The inks are specially formulated thermoplastic pressure æensitive media. Masks and panels produced in accordance with the present invention are interchangeable.
Thus the present inven~ion provides, in a color TV
bulb, a panel comprising: a screen and an array of background ma~rix and color phosphors in a selected pattern. The pattern is deposited on an interior surface of the screen simultaneously as a cohesive film of pressure-sensi~ive, thermoplastic inks, one for each color phosphor and the background matrix. The inks have organic and inorganic components ana are combined in the selected pattern prior to deposition onto the screen. The inks ~222J~
are hereafter fired to volatilize the organic components and to fix the inorganic components to the screen of the panel.
In another aspect the present invention provides a method of producing a color TV bulb having a panel and funnel fused together in a conventional manner in which the panel has a composite of a black matrix pattern and respective red, blue and green color phosphor patterns deposited thereonu The method comprises the s~eps of formulating separate thermoplastic ink compositions for each of the black matri~
and color phosphors, said inks exhibiting cohesive strength and pressure sensitivity at near room temperaturei forming each composition into a corresponding separate pattern;
establishing the black matrix and respective color phosphors in separate ink patterns on separate carriers from the separ-ate inks; comple~ely transferring and registrably combining the separate patterns into the composite onto at least one collector; and completely transferring the composite from the collector to the panel.
In another aspect the present invention provides an interchangeable aperture mask for a color TV panel and having apertures formed therein by acid etching. rrhe mask includes a mask portion having front and back sides bound by a peripheral margin and being formed into a desired shape.
The front and back sides of the mask portion are registrably printed with a respective pattern, each pattern being formed of an acid resistant hot-melt material for coating selected portions of the mask portion. The registrably printed pattern for each of the front and ~ack mask portion in the same relative position front to back, such that, upon etching the apertures are formed in the mask portion in the uncoated areas as through holes; the aperture mask having the acid resistant material and acid removed after etching.
- 2a -~27~) n ~ nother aspect the present invention provides ~ me.:hod of p~oducing a target for a color TV panel formed of separate pat~erns corresponding to a background matrix and respective color phosphors comprising the steps of:
establishing separate patterns of each of the background matrix and color phosphors onto separate surfaces, collecting the separate patterns in registration on~o a common surface as a composite pattern; and transferring the entire composite pattern onto the panel by intimate contact of the common surface and the panel in a single pass for forming the target on the panel.
In still a further aspect the present invention provides a color TV panel comprising a screen and a target formed of an array of background matrix and color phosphors affixed thereto in a selected pattern. The pattern is deposited on an interior surface of the screen portion as a cohesive film of pressure-sensitive, hot melt inks, one ink for each color phosphor and the background matrix. The inks have organic and inorganic components and are combined in the selected pattern prior to deposi~ion onto said screen and thereafter are fired to thereby volatilize the organic components and ~ix the target onto the screen.
In a broad method aspect the present invention provides a method of making a cathode-ray tube which comprises a panel and a screen within an array of background matrix and color phosphors in a selected pattern, and a target, comprising the steps of depositing said screen pattern on the interior surface of said screen simultaneously as a cohesive film of pressure-sensitive, thermoplastic inks, one for each color phosphor and the background matrix, the inks having organic and inorganic components and being combined in the selected - 2b -9~
pattern prior to deposition on said screen, and then firing the inks to volatilize the organic components and to fix the inorganic components to the screen of said panel.
Descript.ion of the Drawings FIG. 1 is a schematic representation oE a collector printing process adapted for use in the present invention.
FIGS. 2a, 2b, and 2c are sequential drawings showing printing from a flexible membrane to the inside of a color TV panel.
FIG. 3 is a schematic plan view of the panel with an exemplary few triads of color dots and a portion of the black matrix illustrated.
FIG. 4 is a fragmented schematic representation in side section of a printing apparatus and a preformed and framed shadow mask.
FIG. 5 shows an alternate method of printing opposite sides of a shadow mask using flexible membrane printing.
FIG. 6 is a schematic representation of the shadow mask aftr printing.
FIG. 7 shows the shadow mask of FIG. 6 after etching and cleaning.
FIG. 8 is a fragmented front view of the shadow mask of the pxesent invention before and after etching.
FIG. 9 schematically illustrates a TV picture tube produced from components manufactured in accordance with the techniques described herein.
Description of the Preferred Embodiment .
Panel Manufacture The present invention uses separately formulated inks to print the target of a TV panel. The inks comprise a heat-processable, thermoplastic, pressure-sensitive, hot-~22~9~
melt medium mixed with a selected pigment. The preferred medla melt when heated above room temperature forms cohes,-~e, pressure-sensitive, tacky films when cooled to near room temperature. The pigments are conventional materials used in the TV industry, namelyo green, red, and blue phosphors for the colors and a black graphite for the black matrix or background.
-, A preferred printing device is a gravure printer including collector; transfer surfaces; and corresponding heated gravure surfaces, which receive melted thermoplastic, pressure-sensitive ink from separate heated supplies.
Each gravure surface has a different recessed gravure pattern etched therein for receiving a corresponding ink from its separate supply. Because the gravure surface is heated, the inks remain melted when in contact therewith.
The corresponding transfer surface is formed of an elasto-meric silicone material and contacts the hot fluid ink in the recessed gravure pattern. The ink splits almost evenly between the two surfaces, leaving an impression of the pattern on the transfer surface. The ink immediately cools upon contact with the transfer surface and forms a cohesive, pressure-sensitive, tacky film. The transfer surface, carrying the tacky film, is intimately contacted with the collector formed of an elastomeric silicone material. The ink transfers completely from the transfer surface to the collector.
The separate patterns developed by the separate gravure surfaces are printed on the collector in registration. This means that each separate ink pattern is printed on the col-lector in a specific geometric relation with each of theother ink patterns. Registration is accomplished by align-ment of the components. When all of the inks are printed on ~Z~7~
the collector in the proper relation, the target is estab-lished. Once established, the target may be completely transferred to the panel by intimate contact of the collector with said panel.
The complete and successive transfer of the separate inks occurs for a number of reasons. The inks are tacky.
They tend to stick to almost anything they come in contact with~ The respective transfer surface, the collector and the panel are formulated so that they each have increasing affinity for the inks. The inks form cohesive films when cool. Thus, when transfer occurs, it is complete because the film holds together. The films neither split nor tear.
FIG. 1 is a schematic drawing exemplary of a printing device 10. The present invention utilizes at least four printing stations I-IV, one for each color phosphor and one for the black matrix. Each printing station I-IV includes:
a heated ink trough 18; a heated gravure roll 12 and a transfer roll 14 mounted in pairs 13 on base plate 11 by means not shown;
and a doctor blade 22. A turret 19, mounted for rotation about a central axis C, carries collectors 16 in holders 20.
Each collector 16 includes a flexible silicone membrane 26 secured in a frame 28. Each ink trough 18 carries a separate ink formulation for deposition onto a gravure roll 12 (e.g., M-black matrix, R-red, G-green, and B-blue)O
Each gravure roll 12 has a selected pattern etched therein. For example, at station I gravure roll 12 has a pattern P-M corrsponding to the desired configuration of ~2227~3 the black matrix. The hlack ink M carried in heated trough 18 is a melted, graphite filled, thermoplastic fluid. The ink ~l, deposited on gravure roll 12 a~ station I, is doctored in a conventional manner by blade 22. Ink M in pattern P-M
on gravurs roll 12 is carried into intimate contact with transfer roll 14, whereupon the ink M is split between such rolls. The ink M, deposited onto cool transfer roll 14, forms a tacky cohesive film 24M wherein the pattern P-M is reproduced on transfer roll 14. The film 24M is brought into intimate contact with collector 16. In this instance, the ink M forming the film 24M does not split, but completely transfers from the transfer roll 14 to the collector 16.
The pattern P-~, generated on gravure roll 12, is thereby formed on collector 16 as film 24M'.
The above process is repeated at stations II, III and IV for the remaining inks R, G, and B. Respective patterns P-R, P-G and P-B are reproduced in the corresponding collector 16 as films 2gR', 24G' and 24B' and deposited in registration onto the collector 16 as a composite film 24. There is no print back from any collector 16 to any of the transfer rolls 14. The collector has a higher affinity for the ink than the transfer rolls 14.
The collector 16, carrying the composite film 24, is removed from holder 20 and is locked in position within a TV
panel 30 by means not shown (see FIG. 2a). Flexible plunger 32 engages a re~r side 34 of membrane 26, urging the membrane 26 and film 24 carried thereby against an inside surface 38 of panel 30 (see Fig. 2b). The film 24 preferentially adheres to the inside surface 38 of panel 30. The plunger 32 is thereafter withdrawn. The membrane 26 relaxes and 279i[1 peels away from the film 24 which forms target 24' (see FIG.
2c).
In FIG. 3 an illustrative portion of target 24' is shown. The target 24' comprises black matrix 40 and triads 41 formed of a green dot 42G, a red dot 42R and a blue dot 42B. The black matrix 40 corresponds to the pattern P-M
generated by gravure roll 12 at station I using ink M. The dots 42R, 42G and 42B correspond respectively to the patterns P-R, P-G, and P-B generated at stations II-IV.
The target 24' is finished with an organic sealant 46 and sputtered aluminum reflective conductive coating 48.
The panel 30 is fired, and the organic materials forming the various ink media are burned off. The inorganic pigments forming the target ~4', and the aluminum coating 18 are fixed to the panel 30.
In another embodiment, the collector 16 may be a ~iber-glass reinforced silicone blanket ~not shown). Also transfer of the film 24 to the panel 30 may be effected by applying pressure with a cut roll (not shown~ on the opposite side of the membrane 34 on the blanket.
Aperture Mask Manufacture FIGS. 4-8 illustrate aperture mask printing and manu-facture. Resist inks are deposited on the mask after it is ormed in the required shape. Resist inks utilized may be pressure-sensitive hot-melt inks which exhibït sufficient adhesion and acid resistance to serve as satisfactory acid resists in their cooled ambient state. The inks may be pressure-sensitive hot-melt inks which are capable of cross-linking or curing to enhance their acid resistance. Latent 30catalysts may be added to the inks, which catalysts are ~:2279() selected not to induce curing at temperatures below about 300F. Once curing occurs, the inks may be referred to as thermoset materials. Waxes may also be employed as suitable resist inks.
A member that prints the resist ink onto the mask may be a roll, blanket, membrane, or pad, havîng a silicone working surface. Gravure or flexographic techniques may be useful. The mask receives the resist in]c directly from a heated metal inking surface, or through an intermediate offset or transfer roll. Transfer of the ink to the mask is effected by causing intimate mechanical contact between the mask and the transfer member carrying the ink. Intimate contact may be accomplished by urging the transfer member against the metal surface of the mask.
In FIG. 5, there is illustrated a fragmented side view of an aperture mask 110 having a preformed cylindrical or spherical shadow mask portion 112 and peripherally attached frame 11~. The frame 114 may be an internally formed bead, as shown, or a separately welded ring. The shadow mask portion 112 has respective front and back sides 113 and 115, each of which receives a printed coating as hereafter described.
In the present invention an offset gravure printing apparatus 120 is disclosed for printing the respective front and back sides 113 and 115 of the mask 110. The printing apparatus 120 requires similar elements for printing the respective front and back sides 113 and 115 of the mask 110.
Such similar elements, hereinafter described, will be referred to by the same descriptive name but with the reerence numerals in the elements used to print the back side 115 of mask 110 being primed counterparts of the elements used for printing the front slde 113 thereof.
The printing apparatus 120 includes heated gravure rolls 122-122', heated troughs 124-124', melted thermo-plastic ink 126 ~the same material for both sides~ in heated troughs 124~124', doctor blades 128-128' and silicone elastomeric offset rolls 130-130'. A surface 132-132' of each gravure roll 122-122' is etched or engraved with a pattern PG-PG'. The ink 126 is deposited on each gravure lC roll 122-122' and any excess is removed in a known manner by corresponding doctor blade 128-128'. The ink 126 remaining on each roll 122-122' forms a film 134-134' in a pattern corresponding to the etchings PG-PG' in each respective gravure roll 122-122'.
Although exaggerated ;n thickness and the dimensions, each film 134-134' has respective solid portions 138-138' and aperture portions 140-140'. Each offset roll 130-130' contacts the corresponding gravure roll 122-122' as shown, and picks up the film 134-134' hy split.ting action (see reference numerals 135-135'). Each oEfset roll 130-130' is preferably cool. The film 134-134', freezes upon contact with the offset roll 130-130' thereby forming a xespective patterned cohesive film 136-136' thereon.
The ink 126 forming cohesive films 136-136 7 iS tacky at near room temperature. Each cohesive film 136-136' is transferred completely from the corresponding offse~ roll 130-130' to the respective front and back side 113 and 115 of aperture mask 110 upon intimate contac-t (see reference numerals 137-137'~. The offset rolls 130-130' act as mutual ~22Z79~
backing members as mask 110 is passed therebetween during the printing operation.
The offset roll 130', used for printing the back side 115 of mask 110, has a cut 141' formed thereinO Cut 141' allows the offset 130' to clear the frame 114. Also the offset roll 130' may be oriented so that a leading edge 143' of the cut 141' engages the back side 115 of mask 110 near where the frame 114 and mask portion 112 meet at inside corner 145'.
In another preferred embodiment, plain inking rolls may be substituted for gravure rolls 122-122', and raised patterned flexographic rolls may be substituted for offset rolls 130-130'.
In FigO 5 the aperture mask 110 may be printed using flexible blankets or membranes as collectors 150-150'.
Respective cohesive films 136-136' may first be deposited into collectors 150-150' by a gravure process. Each cohesive film 135-136' may thereafter be deposited on the respective front and back sides 113 and 115 of mask by urging the collectors 150-150' and the respective cohesive films 136-136' into intimate contact with opposite front and back sides 113 and 115 of the mask 110. Opposed rolls 154-154' urge the respective collectors 150-150' against the mask 110. The rolls 150-150' act as complimentary backing members for each other. The roll 154' may have cut 151' for allowing it to clear frame 114. The cohesive films 136-136' have a greater affinity for the mask 110 than respective collectors 150-150' and thus transfer to the mask 110 as integral cohesive films.
~;~227~) In FIG.6 the cohesive films 138-138' are shown after deposition onto the opposite sides 113 and 115 of the mask 110. The cohesive films 136-136' are printed onto the shadow mask portion 112 so that solid portions 138-138' from coated areas 159-159' and aperture portions 140-140' leave uncoated areas 160-160'. The respective aperture portions 140-140' and solid portions 138-138' are in alignment or registration. The respective unsoated portions 160-160' of the mask 110 are aligned in registration, one opposite the other, on the respective front and back sides 113 and 115 of the mask 110. Thus, the exposed portions 160-160' are subjected to acid etching whereby through holes 170 may be made (see FIG. 7)O
In FIG. 8 the aperture mask 110 is shown in two frag-mented parts of a fron~ elevation. In the upper part of the drawing, prior to acid etching, the cohesive film 138 is shown deposited onto the front side 113 of the aperture mask 110 with exposed portions 160 of the same shown as darkened circles. In the lower portion of the drawing, after acid etching, the exposed portions 160 of the aperture mask 110 - have been dissolved, creating holes or apertures 170 therein, shown as open circlesO It should be understood that the etching takes place from both sides of the aperture mask 110. Once etching is complete, the aperture mask 110 is thoroughly cleaned and rinsed for removing acid and ink therefrom (see FIG. 7)O The interchangeable aperture mask 110 of the present invention is thus complete~.
~L2;2~7~{1 A preferred ink 126 is disclosed in the following example.
Material Parts/Wt.
EPON 1001 (Shell) 60 FC 431 (3M) Z6040 (Dow-Corning) 2 Dicyandiamide Dibutyl Phthalate 25 K745 Black (Ferro) 25 Print at between 125-175F
Cure for 1/2 hour at 300-500Fo In the example, the ink 126 is a heat processable hot melt, thermoplastic (thermosetting above 300F), pressure-sensitive material. The ink reversably melts with heat and solidifies upon cooling. It cures and becomes thermosetting once cross-linking occurs above 300F. The ink 126 may be formulated to become tacky at near room temperature so that a pressure-sensitive cohesive film may be produced. The ink 126 may also be formulated to preferentially stick to one surface over another. Thus, in the present invention, ink - 126 preferentially sticks to the mask 110 and releases from the offset rolls 130 130'. Similarly if intermediate surface carriers are used, for example, collectors 150-150', the surfaces against which the ink 126 preferentially adheres are formulated to provide adherence in a specific order~
Picture Tube Manufacture In FIG. 9 a picture tube 100 is shown schematically in side section. The tube 100 includes the panel 30 with target 24' printed thereon, ma~k 110 with an aperture pattern 106 manufactured as hereinbefore described, and a conventional o funnel 102 and gun 103. If a tube 100 is manufactured using a beam indexing gun, the mask 110 is not used. Thus, the mask 110 becomes an optional feature.
Conventional means, not shown, may be used to fix the panel 30 and mask 110 in a desired spatial relation~ Each panel 30 is interchangeable with any other mask 110 of the same model tube. That is, the respective target 24' and aperture pattern 106 are desiged to work together in a particular picture tube arrangement.
Claims (15)
1. Color TV bulb comprising a panel and a screen with an array of background matrix and color phosphors in a selected pattern, a target and an interchangeable aperture mask, characterized in that said screen pattern is deposited on an interior surface of said screen simultaneously as a cohesive film of pressure-sensitive, thermoplastic inks, one for each color phosphor and the background matrix;
the inks having organic and inorganic components and being combined in the selected pattern prior to deposition onto said screen;the inks being thereafter fired to votilize the organic components and to fix the inorganic components to the screen of said panel.
the inks having organic and inorganic components and being combined in the selected pattern prior to deposition onto said screen;the inks being thereafter fired to votilize the organic components and to fix the inorganic components to the screen of said panel.
2. Color TV bulb as defined in claim 1 wherein said aperture mask is mounted in spaced relationship with the panel, the aperture mask having apertures formed therein by acid etching including: a mask portion having front and back sides bound by a peripheral margin and being formed into a desired shape; the front and back side of said mask portion being printed with a respective pattern; each pattern being formed of acid resistant, hot-melt, thermoplastic material coating the mask portion; the pattern for each of the front and back sides leaving uncoated areas of the mask portion in the same relative position front to back of the mask portion, such that, upon etching, the apertures are formed in the mask portion in the uncoated areas as through holes; the aperture mask having the acid resistant material and acid removed after etching.
3 Color TV bulb according to claim 1, said panel comprising a screen and a target formed of an array of background matrix and color phosphors affixed thereto in a selected pattern, said pattern being deposited on an interior surface of said screen portion as a cohesive film of pressure-sensitive, hot-melt inks, one ink for each color phosphor and the background matrix, the inks having organic and inorganic components and combined in the selected pattern prior to deposition onto said screen and thereafter are fired to thereby volatilize the organic components and fix the target onto the screen.
4. Color TV bulb according to claim 2, said aperture mask including a frame portion being attached to said mask portion about said peripheral margin.
5. Color TV bulb according to claim 2, wherein the acid resistant material is formed of a thermoplastic material which becomes a cross-linked thermosetting material at a selected temperature.
6. A method of making the color TV bulb of claim 1, which comprises the steps of:
formulating separate thermoplastic ink compositions for each of the background matrix and color phosphors of said color TV bulb, said inks exhibiting cohesive strength and pressure sensitivity at near room temperature;
forming each composition into a corresponding separate pattern;
establishing the background matrix and respective color phosphors in separate ink patterns on separate carriers for the separate inks; completely transferring and registerably combining the separate patterns into the array of background matrix and color phosphors onto at least one collector; and completely transferring said array from the collector to the panel.
formulating separate thermoplastic ink compositions for each of the background matrix and color phosphors of said color TV bulb, said inks exhibiting cohesive strength and pressure sensitivity at near room temperature;
forming each composition into a corresponding separate pattern;
establishing the background matrix and respective color phosphors in separate ink patterns on separate carriers for the separate inks; completely transferring and registerably combining the separate patterns into the array of background matrix and color phosphors onto at least one collector; and completely transferring said array from the collector to the panel.
7. A method as set forth in claim 6 further comprising the steps of: depositing a conductive reflective film over the array of background matrix and color phosphors after said array has been transferred to the panel; and firing the panel and composite film for volatilizing organic compounds to thereby permanently affix the film and the reflective coating onto the panel.
8. A method as set forth in claim 6 further comprising making a TV aperture mask including the steps of: forming a metal sheet into a desired shape having a shadow mask portion; printing opposite sides of the shadow mask portion with an acid resistant material in a desired aperture pattern; and acid etching the mask portion for producing apertures in said mask portion not covered by the acid resistant material.
9. A method as set forth in claim 8 further comprising the steps of: formulating the acid resistant material and inks from heat processable thermoplastic compositions.
10. A method as defined in claim 9 wherein printing the panel and the shadow mask further comprises the steps of:
depositing the thermoplastic compositions in the corres-ponding desired patterns onto a corresponding transfer surface for the corresponding side of the shadow mask portion and the panel to be printed; and intimately contacting the transfer surface with the corresponding surface of the mask portion, whereby said thermoplastic composition preferentially adheres to the corresponding surface and releases from the transfer surface during such intimate contact.
depositing the thermoplastic compositions in the corres-ponding desired patterns onto a corresponding transfer surface for the corresponding side of the shadow mask portion and the panel to be printed; and intimately contacting the transfer surface with the corresponding surface of the mask portion, whereby said thermoplastic composition preferentially adheres to the corresponding surface and releases from the transfer surface during such intimate contact.
11. A method as defined in claim 9 wherein the heat processable thermoplastic compositions for printing the shadow mask portion are selected to lose their thermoplastic properties upon curing above about 300°F
thereby enhancing their acid resistant properties.
thereby enhancing their acid resistant properties.
12. A method as defined in claim 8 wherein the printing step comprises the steps of: melting the ink;
depositing the melted ink into a heated inking surface and maintaining the ink melted thereon; transferring the ink to a relatively cool offset surface; causing the ink to form a cohesive film thereon; and totally transferring the ink onto the aperture mask by intimately contacting the offset surface and shadow mask portion.
depositing the melted ink into a heated inking surface and maintaining the ink melted thereon; transferring the ink to a relatively cool offset surface; causing the ink to form a cohesive film thereon; and totally transferring the ink onto the aperture mask by intimately contacting the offset surface and shadow mask portion.
13. A method as defined in claim 12 wherein the printing step comprises the step of: establishing the pattern in at least one of the inking surface and offset surface.
14. A method as defined in claim 8 further comprising the step of: formulating the ink with a thermosetting composi-tion, and heating the ink after deposition onto the mask to above a curing temperature of the ink for setting the same on the mask portion.
15. A method of making a cathode-ray tube, which comprises a panel and a screen within an array of background matrix and color phosphors in a selected pattern, and a target, comprising the steps of depositing said screen pattern on the interior surface of said screen simultaneously as a cohesive film of pressure-sensitive, thermoplastic inks, one for each color phosphor and the background matrix, the inks having organic and inorganic components and being combined in the selected pattern prior to deposition on said screen, and then firing the inks to volatilize the organic components and to fix the inorganic components to the screen of said panel.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US427,731 | 1982-09-29 | ||
| US427,515 | 1982-09-29 | ||
| US06/427,515 US4549928A (en) | 1982-09-29 | 1982-09-29 | Television panel and method of manufacture |
| US427,514 | 1982-09-29 | ||
| US06/427,514 US4557798A (en) | 1982-09-29 | 1982-09-29 | Television tube with optional shadow mask and method of manufacture |
| US06/427,731 US4752353A (en) | 1982-09-29 | 1982-09-29 | Method for transfer printing of TV shadow mask resist |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1222790A true CA1222790A (en) | 1987-06-09 |
Family
ID=27411549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000436531A Expired CA1222790A (en) | 1982-09-29 | 1983-09-12 | Television tube with optional shadow mask and method of manufacture |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0104834B1 (en) |
| KR (1) | KR920001500B1 (en) |
| CA (1) | CA1222790A (en) |
| DE (1) | DE3372891D1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3709206A1 (en) * | 1987-03-20 | 1988-09-29 | Standard Elektrik Lorenz Ag | MANUFACTURING METHOD FOR THE ILLUMINATOR OF AN IMAGE DISPLAY DEVICE |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3889329A (en) * | 1973-05-16 | 1975-06-17 | Fazal A Fazlin | Process for making color television masks |
| US4069085A (en) * | 1973-07-16 | 1978-01-17 | U.S. Philips Corporation | Apparatus for forming apertures in a thin metal tape such as a shadow mask for a color television display tube |
| JPS5524227B2 (en) * | 1973-08-08 | 1980-06-27 |
-
1983
- 1983-09-12 CA CA000436531A patent/CA1222790A/en not_active Expired
- 1983-09-14 DE DE8383305374T patent/DE3372891D1/en not_active Expired
- 1983-09-14 EP EP83305374A patent/EP0104834B1/en not_active Expired
- 1983-09-29 KR KR1019830004598A patent/KR920001500B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0104834B1 (en) | 1987-08-05 |
| KR840006268A (en) | 1984-11-22 |
| EP0104834A1 (en) | 1984-04-04 |
| KR920001500B1 (en) | 1992-02-15 |
| DE3372891D1 (en) | 1987-09-10 |
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