CA1060079A - Method of manufacturing a cathode ray tube for displaying coloured pictures and cathode ray tube manufactured according to said method - Google Patents
Method of manufacturing a cathode ray tube for displaying coloured pictures and cathode ray tube manufactured according to said methodInfo
- Publication number
- CA1060079A CA1060079A CA259,898A CA259898A CA1060079A CA 1060079 A CA1060079 A CA 1060079A CA 259898 A CA259898 A CA 259898A CA 1060079 A CA1060079 A CA 1060079A
- Authority
- CA
- Canada
- Prior art keywords
- colour
- layer
- luminescent
- selection electrode
- regions
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Electroluminescent Light Sources (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
Abstract
ABSTRACT:
A method of manufacturing a cathode ray tube for displaying coloured pictures and cathode ray tube manufactured according to said method. The triplets of phosphor lines of the display screen each correspond to a row of apertures in the colour selection electrode. The two outermost rows of apertures do not correspond to a triplet of phosphor lines. Both absent triplets are replaced, for example, by a light absorbing material.
A method of manufacturing a cathode ray tube for displaying coloured pictures and cathode ray tube manufactured according to said method. The triplets of phosphor lines of the display screen each correspond to a row of apertures in the colour selection electrode. The two outermost rows of apertures do not correspond to a triplet of phosphor lines. Both absent triplets are replaced, for example, by a light absorbing material.
Description
1060079 ~ -The invention relates to a method of manufactur;ng a cathode ray tube for displaying coloured pictures and comprising a display screen having a large number of triplets each consisting of three linear regions luminescing in different colours, means to generate three electron beams, and a colour selection electrode wh;ch has a large number -~ .
of substantially parallel slots for assigning each electron beam to luminescent regions of one colour in such manner ~ -that each triplet corresponds to one slot, in which method for providing the luminescent regions of each colour a ;~ -photosensitive layer is exposed through the colour selection :
electrode from at least two positions in such manner that ; .
the light beams which pass through two juxtaposed slots overlap each other on the photosensitive layer and an ~
unexposed region where the luminescent regions of the said - -colour are to be provided is formed on the photosensitive : layer between the light beams which pass through the same slot. The invention also relates to a cathode ray tube ;
manufactured according to such a method.
German Offenlegungsschrift 2,248,878, which was ~ ~ ~ laid open to public inspection on April 19, 1973, discloses : a method of manufacturing such a cathode ray tube in which the photosensitive layer is exposed through the colour selection electrode from at least two positions in such ~-manner that the light beams which pass through two juxta~
posed slots overlap each other on the photosensit~ve layer .
''"'.' "
~ 2 ~
. . . .
B ` : -}~lr~. 8121 1 9 _ 1 _ 1 9 7 G
~060C~79 and an uncxposed region is formed on the photosensitjve layer between the light beams which pass through the same slot. In the method described in said Offenlegungsschrift light-absorbing strips are provided on the said unexposed regions which separate the linear regions from each other which luminesce in different colours. The application of the method described in said Offenlegungsschrift for providing the luminescent regions themselves proves to meet unexpected difficulties which will be described in detail hereinaf-ter with reference to a drawing. As a matter of fact, the result of the use of the exposure method described in the Offenlegungsschrift for providing the luminescent regions would be that the two outermost triplets which during normal operation of the tube are present on the extreme left and on the extreme right at the edge of the display screen do not correctly display the colour. As a result of this the displayed picture has edges which show annoying colour defects.
It is to be noted that a slot in the colour selection electrode may consist of one uninterrupted slot-like aperture or of a row of elongate apertures having narrow bridges between them.
It is the obJect of the invention to avoid the above-mentioned colour defects.
~25 ~or that purpose, according to the:;nvention, prior to providing the luminescent regions the photosensitlve layer is exposed entirely through the colour selection electrode in the region of the triplets which correspond to the outermost slot but one on the two ~ides of the colour : , --, .
- ~ PHN 8121 ~60079 selection electrode as well as in the region between the last-mentioned triplets after which a non-luminescent layer is prov;ded on the unexposed parts of the photosensitive layer.
The said non-lum;nescent layer preferably is a light-absorbing layer which may form part of a dark coloured picture frame.
The non-luminescent layer may also be a conductive layer on which, when the luminescent regions are subsequently provided electrophotographically, no charge can be maintained and consequently no luminescent material is deposited.
In a cathode ray tube for d;splaying coloured pictures according to the invention the electron beams ~
after passing through the outermost slot on either side ~ `-of the colour selection electrode do not impinge upon luminescent regions so that picture edges showing the said colour defects are absent.
A suitable method of providing luminescent or non-luminescent material on the unexposed regions of a photosensitive layer is the electrophotographic method disclosed in United States Patent Specification 3,475,169, which issued to Zenith Radio Corp. on October 28, 1969, in which the photosensitive layer is a photoconductive layer which is provided with an electric charge pattern which is developed by means of a suspension whlch contains electrically charged grains of the material to be provided.
In another method the powder to be provided is provided in a photosensitive layer which in the unexposed condition is insoluble in the solvent and after the exposure is soluble in the solvent. After exposure through the B
P~. &121 colo~r selection electrode the photosensitive layer containing the material to be provided is developed with the solvent. These and similar methods are known from the prior art.
The invention will be described in greater detail with reference to the accompanying drawing, of which:
~ig. 1 shows a colour television display tube according to the invention, Fig. 2 shows the pattern of slots in the colour - ~selection electrode of the tube shown in Fig. 1, ~igs. 3a, b and c explain diagrammatically an exposure method of manufac-turing a tube according to the invention, and Fig. 4 explains an extra step according to the invention in this method.
The tube shown in ~ig. 1 comprises a glass en~elope 1 in which means 2 are- present to generate three electron beams 3, 4 and 5, a display screen 6 and a colour selection Z0 electrode 7. The electron beams are generated in one flat plate through the axis 8 of the tube; during normal operation of the tube said plane i9 horizontal and is the plane of drawing of ~ig. 1. The displa~;screen 6 comprises a large number of phosphor lines 9 wh~ch extend vertically .
normal to the plane of drawing. The phosphor lines 9 are , arranged in triplets containing a red, a green and a blue luminescent phosphor line. ~ slot 10 in the colour selection electrode 7 is associated with each triplet. The slots 10 -~ are norma1 to thei~plane of drawing and are formed by either - , ' , ':
~ ~ PIIN. 8121, _- ~ 12-2-1976, 1060(:~79 an uninterrupted slot or a row of eloIIgate apertures having narrow bridges between them, as is shown in Fig. Z.
The slots in the colour selection electrode ensure that the electron beam 3 impinges only on red luminescent phosphor lines and the electron beams 4 and 5 - impinge only on green and blue luminescent phosphor lines, respectively, The eloctron beams 3, 4 and 5 scan the display screen 6 under the influence of the deflection coils 11.
For further explanation, Fig. 2 shows a front elevation of the colour selection electrode with which the arrangement of the elongate apertures 12 in vertical slots 10 is again explained. The two outermost slots 13 and 14 which are also shown in Fig, 1 do not correspond to a triplet. According to the invention, in the places denoted in Fig. 1 by 15 and 16 there is no triplet but a non-luminescent~ preferably light-absorbing layer for reasons to be given hereinafter.
An exposure method with which the tube shown in Fig. 1 can be manufactured will now be described with ,; ~ .
~ ` 20 reference to Figs. 3a, b and c assuming thatj the extra step ;; in the method explained in Fig. 4 is also used.
~ Figs. 3A, B, C and 4 show diagrammatically .: .. .
the display screen 6 and the colour selection electrode 7, The longitudinal direction of the slots 10 of the 25 ~ colour selection electrode 7 is normal to the plane of the drawing. The outermost slot on one side of the coIour selection electrode is referenced 14, The places where the blue, green and red luminescent phosphor lines should be :~ .
~ provided are denoted by B, G and R, ~.,- .
., , ' , . .
PIIN. 8121.
12-2-1976, ~060079 In Fig. 3a the display screen is exposed from two positions in such rnanner that the light beams 17 and 18 which pass through the same slot 10 ~orm an unexposed region where a green luminescent phosphor line should be provided. Between two slots 10 the light beamSoverlap each other so that no unexposed region is formed at that area.
In a quite analogous manner exposure is carried out in the manner shown in Fig. 3b for providing the blue luminescent phosphor line and Fig. 3c for providing the red luminescent phosphor line.
It also appears from Figs. 3a, b and c that the region o~ the display screen opposite to which there are no slots of the colour selection electrode also remains unexposed and will hence also be provided with phosphor.
This does not matter when said phosphor is not provided in ~-the region where a triplet corresponding to the outermost - slot 14 would have to be present. However, it is obvious from Fig. 3c that, because the light beam 19 denoted by broken lines is not present because actually the slot 14 is the outermost slot, red luminescent phosphor is provided not only outside the region of the effective display screen but also at the area where a blue luminescent phosphor line is already present. The triplet corresponding to the -outermost slot 14 thus does not display the correct colour, which is expressed in a wrongly coloured edge of the displayed picture the cause of which, as explained above, proved to be difficult to find.
According to the invention by means of an extra step in the method used the electron , .. :
.~ , ^'. .
~'lr~. 8121 -~ ` 19~ J76 lQ60079 beams which pass through the outerlnost slot 14 do not impinge upon a triplet. ~or that purpose, prior to providing the phosphor lines, thephotosensitive layer is exposed entirely in the manner as shown in Fig. 4 ~ith the exception of the area behind the-outermost slot 14 and the parts of the display screen which are present ~ven farther to the outside. Said exposure ~hould be carried out in two phases, namely for the left-hand edge of` the display screen while the right-hand edge is covered and for the right-hand edge of the display screen while the left-hand edge is covered.
A non-luminescent layer of preferably a light absorbin~ or electrically conductive material is provided on the unexposed edges, after which according to the 1~ method of ~igs. 3a, b and c the phosphor lines are provided.
The extra exposure is carried out by moving a light source in such a manner that the light beams 19 which pass thro~gh the apertures 10 perform the movement as~denoted by the arrows 20.
~ 20 As already noted, an electrophotographic method - is a sui*able method of providing a phosphor pattern or a pattern of light absorbing material nn the unexposed regions of a photosensitive layer. Such a method is disclosed in United States Patent Specification 3,475,169 ~25 and therefore requires only & brief explanation. A firable conductive la~er is provided on the window of the display tube and then a firable photoconductive layer is provided.
The photoconductive layer is then provided with a negative surface charge by means- of a corona discharge of electrodes .- .
~ - 8 - ~
.
I'lTN. ~121 ~060079 which have n potential of, for example, -30 kV relative to the conductive layer. ~he photoconductive layer is then eXposed~ ccordi.ng to the desired pattern so that the negative charge is maintained on].y on the unexposed places.
The photoconductive layer is t~:en developed by means of a suspension of positively charged phosphor particles and particles of a light absorbing material, respectively, which deposit~on the pattern of unexposed regions of the photoconductive layer. According to the invention, the . regions 15 and 16 (Fig. 1) along the edge of the display screen are first provided with conductive light absorbing material by means of the exposure explained with reference .
to Fig. 4. In the subse~uent charging step no surface .charge can be maintained in said regions so that during the 15 . development with phosphor suspension no phosphor deposits on the regions 15 and 16.
_ 9 _
of substantially parallel slots for assigning each electron beam to luminescent regions of one colour in such manner ~ -that each triplet corresponds to one slot, in which method for providing the luminescent regions of each colour a ;~ -photosensitive layer is exposed through the colour selection :
electrode from at least two positions in such manner that ; .
the light beams which pass through two juxtaposed slots overlap each other on the photosensitive layer and an ~
unexposed region where the luminescent regions of the said - -colour are to be provided is formed on the photosensitive : layer between the light beams which pass through the same slot. The invention also relates to a cathode ray tube ;
manufactured according to such a method.
German Offenlegungsschrift 2,248,878, which was ~ ~ ~ laid open to public inspection on April 19, 1973, discloses : a method of manufacturing such a cathode ray tube in which the photosensitive layer is exposed through the colour selection electrode from at least two positions in such ~-manner that the light beams which pass through two juxta~
posed slots overlap each other on the photosensit~ve layer .
''"'.' "
~ 2 ~
. . . .
B ` : -}~lr~. 8121 1 9 _ 1 _ 1 9 7 G
~060C~79 and an uncxposed region is formed on the photosensitjve layer between the light beams which pass through the same slot. In the method described in said Offenlegungsschrift light-absorbing strips are provided on the said unexposed regions which separate the linear regions from each other which luminesce in different colours. The application of the method described in said Offenlegungsschrift for providing the luminescent regions themselves proves to meet unexpected difficulties which will be described in detail hereinaf-ter with reference to a drawing. As a matter of fact, the result of the use of the exposure method described in the Offenlegungsschrift for providing the luminescent regions would be that the two outermost triplets which during normal operation of the tube are present on the extreme left and on the extreme right at the edge of the display screen do not correctly display the colour. As a result of this the displayed picture has edges which show annoying colour defects.
It is to be noted that a slot in the colour selection electrode may consist of one uninterrupted slot-like aperture or of a row of elongate apertures having narrow bridges between them.
It is the obJect of the invention to avoid the above-mentioned colour defects.
~25 ~or that purpose, according to the:;nvention, prior to providing the luminescent regions the photosensitlve layer is exposed entirely through the colour selection electrode in the region of the triplets which correspond to the outermost slot but one on the two ~ides of the colour : , --, .
- ~ PHN 8121 ~60079 selection electrode as well as in the region between the last-mentioned triplets after which a non-luminescent layer is prov;ded on the unexposed parts of the photosensitive layer.
The said non-lum;nescent layer preferably is a light-absorbing layer which may form part of a dark coloured picture frame.
The non-luminescent layer may also be a conductive layer on which, when the luminescent regions are subsequently provided electrophotographically, no charge can be maintained and consequently no luminescent material is deposited.
In a cathode ray tube for d;splaying coloured pictures according to the invention the electron beams ~
after passing through the outermost slot on either side ~ `-of the colour selection electrode do not impinge upon luminescent regions so that picture edges showing the said colour defects are absent.
A suitable method of providing luminescent or non-luminescent material on the unexposed regions of a photosensitive layer is the electrophotographic method disclosed in United States Patent Specification 3,475,169, which issued to Zenith Radio Corp. on October 28, 1969, in which the photosensitive layer is a photoconductive layer which is provided with an electric charge pattern which is developed by means of a suspension whlch contains electrically charged grains of the material to be provided.
In another method the powder to be provided is provided in a photosensitive layer which in the unexposed condition is insoluble in the solvent and after the exposure is soluble in the solvent. After exposure through the B
P~. &121 colo~r selection electrode the photosensitive layer containing the material to be provided is developed with the solvent. These and similar methods are known from the prior art.
The invention will be described in greater detail with reference to the accompanying drawing, of which:
~ig. 1 shows a colour television display tube according to the invention, Fig. 2 shows the pattern of slots in the colour - ~selection electrode of the tube shown in Fig. 1, ~igs. 3a, b and c explain diagrammatically an exposure method of manufac-turing a tube according to the invention, and Fig. 4 explains an extra step according to the invention in this method.
The tube shown in ~ig. 1 comprises a glass en~elope 1 in which means 2 are- present to generate three electron beams 3, 4 and 5, a display screen 6 and a colour selection Z0 electrode 7. The electron beams are generated in one flat plate through the axis 8 of the tube; during normal operation of the tube said plane i9 horizontal and is the plane of drawing of ~ig. 1. The displa~;screen 6 comprises a large number of phosphor lines 9 wh~ch extend vertically .
normal to the plane of drawing. The phosphor lines 9 are , arranged in triplets containing a red, a green and a blue luminescent phosphor line. ~ slot 10 in the colour selection electrode 7 is associated with each triplet. The slots 10 -~ are norma1 to thei~plane of drawing and are formed by either - , ' , ':
~ ~ PIIN. 8121, _- ~ 12-2-1976, 1060(:~79 an uninterrupted slot or a row of eloIIgate apertures having narrow bridges between them, as is shown in Fig. Z.
The slots in the colour selection electrode ensure that the electron beam 3 impinges only on red luminescent phosphor lines and the electron beams 4 and 5 - impinge only on green and blue luminescent phosphor lines, respectively, The eloctron beams 3, 4 and 5 scan the display screen 6 under the influence of the deflection coils 11.
For further explanation, Fig. 2 shows a front elevation of the colour selection electrode with which the arrangement of the elongate apertures 12 in vertical slots 10 is again explained. The two outermost slots 13 and 14 which are also shown in Fig, 1 do not correspond to a triplet. According to the invention, in the places denoted in Fig. 1 by 15 and 16 there is no triplet but a non-luminescent~ preferably light-absorbing layer for reasons to be given hereinafter.
An exposure method with which the tube shown in Fig. 1 can be manufactured will now be described with ,; ~ .
~ ` 20 reference to Figs. 3a, b and c assuming thatj the extra step ;; in the method explained in Fig. 4 is also used.
~ Figs. 3A, B, C and 4 show diagrammatically .: .. .
the display screen 6 and the colour selection electrode 7, The longitudinal direction of the slots 10 of the 25 ~ colour selection electrode 7 is normal to the plane of the drawing. The outermost slot on one side of the coIour selection electrode is referenced 14, The places where the blue, green and red luminescent phosphor lines should be :~ .
~ provided are denoted by B, G and R, ~.,- .
., , ' , . .
PIIN. 8121.
12-2-1976, ~060079 In Fig. 3a the display screen is exposed from two positions in such rnanner that the light beams 17 and 18 which pass through the same slot 10 ~orm an unexposed region where a green luminescent phosphor line should be provided. Between two slots 10 the light beamSoverlap each other so that no unexposed region is formed at that area.
In a quite analogous manner exposure is carried out in the manner shown in Fig. 3b for providing the blue luminescent phosphor line and Fig. 3c for providing the red luminescent phosphor line.
It also appears from Figs. 3a, b and c that the region o~ the display screen opposite to which there are no slots of the colour selection electrode also remains unexposed and will hence also be provided with phosphor.
This does not matter when said phosphor is not provided in ~-the region where a triplet corresponding to the outermost - slot 14 would have to be present. However, it is obvious from Fig. 3c that, because the light beam 19 denoted by broken lines is not present because actually the slot 14 is the outermost slot, red luminescent phosphor is provided not only outside the region of the effective display screen but also at the area where a blue luminescent phosphor line is already present. The triplet corresponding to the -outermost slot 14 thus does not display the correct colour, which is expressed in a wrongly coloured edge of the displayed picture the cause of which, as explained above, proved to be difficult to find.
According to the invention by means of an extra step in the method used the electron , .. :
.~ , ^'. .
~'lr~. 8121 -~ ` 19~ J76 lQ60079 beams which pass through the outerlnost slot 14 do not impinge upon a triplet. ~or that purpose, prior to providing the phosphor lines, thephotosensitive layer is exposed entirely in the manner as shown in Fig. 4 ~ith the exception of the area behind the-outermost slot 14 and the parts of the display screen which are present ~ven farther to the outside. Said exposure ~hould be carried out in two phases, namely for the left-hand edge of` the display screen while the right-hand edge is covered and for the right-hand edge of the display screen while the left-hand edge is covered.
A non-luminescent layer of preferably a light absorbin~ or electrically conductive material is provided on the unexposed edges, after which according to the 1~ method of ~igs. 3a, b and c the phosphor lines are provided.
The extra exposure is carried out by moving a light source in such a manner that the light beams 19 which pass thro~gh the apertures 10 perform the movement as~denoted by the arrows 20.
~ 20 As already noted, an electrophotographic method - is a sui*able method of providing a phosphor pattern or a pattern of light absorbing material nn the unexposed regions of a photosensitive layer. Such a method is disclosed in United States Patent Specification 3,475,169 ~25 and therefore requires only & brief explanation. A firable conductive la~er is provided on the window of the display tube and then a firable photoconductive layer is provided.
The photoconductive layer is then provided with a negative surface charge by means- of a corona discharge of electrodes .- .
~ - 8 - ~
.
I'lTN. ~121 ~060079 which have n potential of, for example, -30 kV relative to the conductive layer. ~he photoconductive layer is then eXposed~ ccordi.ng to the desired pattern so that the negative charge is maintained on].y on the unexposed places.
The photoconductive layer is t~:en developed by means of a suspension of positively charged phosphor particles and particles of a light absorbing material, respectively, which deposit~on the pattern of unexposed regions of the photoconductive layer. According to the invention, the . regions 15 and 16 (Fig. 1) along the edge of the display screen are first provided with conductive light absorbing material by means of the exposure explained with reference .
to Fig. 4. In the subse~uent charging step no surface .charge can be maintained in said regions so that during the 15 . development with phosphor suspension no phosphor deposits on the regions 15 and 16.
_ 9 _
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS
1. A method of manufacturing a cathode ray tube for displaying coloured pictures and comprising a display screen having a large number of triplets each consisting of three linear regions luminescing in different colours, means to generate three electron beams, and a colour selection electrode which has a large number of substan-tially parallel slots for assigning each electron beam to luminescent regions of one colour in such manner that each triplet corresponds to one slot, in which method for providing the luminescent regions of each colour a photo-sensitive layer is exposed through the colour selection electrode from at least two positions in such manner that the light beams which pass through two juxtaposed slots overlap each other on the photosensitive layer and an unexposed region where the luminescent regions of the said, colour are to be provided is formed on the photosensitive layer between the light beams which pass through the same slot, characterized in that prior to providing the luminescent regions the photosensitive layer is exposed entirely through the colour selection electrode in the regions of the triplets which correspond to the outermost slot but one on the two sides of the colour selection electrode as well as in the region between the last-mentioned triplets, after which a non-luminescent layer is provided on the unexposed parts of the photosensitive layer.
2. A method as claimed in Claim 1, characterized in that the said non-luminescent layer is a light-absorbing layer.
3. A method as claimed in Claim 1, characterized in that the said non-luminescent layer is a conductive layer.
4. A cathode-ray tube for displaying coloured pictures and comprising a display screen having a large number of triplets each consisting of three linear regions luminescing in different colours, means to generate three electron beams, and a colour selection electrode which has a large number of substantially parallel slots for assigning each electron beam to luminescent regions of one colour in such manner that each triplet corresponds to one slot, characterized in that the electron beams after passing the outermost slot on both sides of the colour selection electrode impinge upon a non-luminescent layer.
5. A cathode ray tube as claimed in Claim 4, characterized in that the electron beams after passing the outermost slot on both sides of the colour selection electrode impinge upon a layer of light-absorbing material.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7510273A NL7510273A (en) | 1975-09-01 | 1975-09-01 | PROCEDURE FOR MANUFACTURE OF A CATHODE RAY TUBE FOR DISPLAYING COLORED IMAGES AND CATHOD RAY TUBE MADE IN ACCORDANCE WITH THIS PROCESS. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1060079A true CA1060079A (en) | 1979-08-07 |
Family
ID=19824387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA259,898A Expired CA1060079A (en) | 1975-09-01 | 1976-08-26 | Method of manufacturing a cathode ray tube for displaying coloured pictures and cathode ray tube manufactured according to said method |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5230157A (en) |
| BE (1) | BE845677A (en) |
| CA (1) | CA1060079A (en) |
| DE (1) | DE2637755C2 (en) |
| ES (2) | ES451102A1 (en) |
| FR (1) | FR2322447A1 (en) |
| GB (1) | GB1533064A (en) |
| IT (1) | IT1071422B (en) |
| NL (1) | NL7510273A (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3152900A (en) * | 1958-11-14 | 1964-10-13 | Rca Corp | Art of making electron-sensitive mosaic screens |
| US3475169A (en) * | 1965-08-20 | 1969-10-28 | Zenith Radio Corp | Process of electrostatically screening color cathode-ray tubes |
| NL7014480A (en) * | 1970-10-02 | 1972-04-05 | ||
| CA961686A (en) * | 1971-10-05 | 1975-01-28 | Senri Miyaoka | Method for producing a striped cathode ray tube screen |
| JPS5236390B2 (en) * | 1972-08-07 | 1977-09-14 |
-
1975
- 1975-09-01 NL NL7510273A patent/NL7510273A/en not_active Application Discontinuation
-
1976
- 1976-08-21 DE DE19762637755 patent/DE2637755C2/en not_active Expired
- 1976-08-26 CA CA259,898A patent/CA1060079A/en not_active Expired
- 1976-08-27 IT IT6910376A patent/IT1071422B/en active
- 1976-08-27 GB GB3572776A patent/GB1533064A/en not_active Expired
- 1976-08-28 JP JP10221676A patent/JPS5230157A/en active Pending
- 1976-08-30 ES ES451102A patent/ES451102A1/en not_active Expired
- 1976-08-30 BE BE170212A patent/BE845677A/en unknown
- 1976-09-01 FR FR7626410A patent/FR2322447A1/en active Granted
-
1977
- 1977-08-12 ES ES461560A patent/ES461560A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5230157A (en) | 1977-03-07 |
| BE845677A (en) | 1977-02-28 |
| IT1071422B (en) | 1985-04-10 |
| ES451102A1 (en) | 1977-12-01 |
| GB1533064A (en) | 1978-11-22 |
| FR2322447A1 (en) | 1977-03-25 |
| ES461560A1 (en) | 1978-06-01 |
| DE2637755A1 (en) | 1977-03-10 |
| DE2637755C2 (en) | 1986-03-06 |
| FR2322447B1 (en) | 1980-05-16 |
| NL7510273A (en) | 1977-03-03 |
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