GB1384167A - Shadow mask colour picture tube and method of fabrication - Google Patents
Shadow mask colour picture tube and method of fabricationInfo
- Publication number
- GB1384167A GB1384167A GB2410472A GB2410472A GB1384167A GB 1384167 A GB1384167 A GB 1384167A GB 2410472 A GB2410472 A GB 2410472A GB 2410472 A GB2410472 A GB 2410472A GB 1384167 A GB1384167 A GB 1384167A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tolerance
- dot
- area
- leaving
- phosphor
- 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
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/18—Luminescent screens
- H01J29/30—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines
- H01J29/32—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines with adjacent dots or lines of different luminescent material, e.g. for colour television
- H01J29/322—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines with adjacent dots or lines of different luminescent material, e.g. for colour television with adjacent dots
Landscapes
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Abstract
1384167 Luminescent screens RCA CORPORATION 23 May 1972 [28 May 1971] 24104/72 Heading H1D In the manufacture of a multi-dot or multiline colour television screen by a photo-resist process, the sizes of the leaving tolerance (shortest distance from a beam landing area to the edge of the phosphor area) and of the clipping tolerance (shortest distance between a phosphor area and an adjacent beam landing area on a different colour phosphor) may vary undesirably over the area of the screen; such variation is measured and corrected by varying the sizes of the phosphor areas without altering their shape. In the case of circular phosphor dots the clipping tolerance can be increased and the leaving tolerance reduced by reducing the diameter of the dot; conversely the clipping tolerance can be reduced and the leaving tolerance increased by increasing the diameter of the dot. A completed screen is examined with a microscope and the variations in dot diameter required for each colour are measured at various points over the area of the screen; the variations may be designed to equalize clipping and leaving tolerances or to make the clipping tolerance always larger than the leaving tolerance. From the measurements, contours of equal variation are plotted separately for each colour and used to produce filters which are incorporated in the "lighthouse" used in the photo-resist process to produce a corresponding variation in light intensity which will vary the dot sizes as required.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14777671A | 1971-05-28 | 1971-05-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1384167A true GB1384167A (en) | 1975-02-19 |
Family
ID=22522861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2410472A Expired GB1384167A (en) | 1971-05-28 | 1972-05-23 | Shadow mask colour picture tube and method of fabrication |
Country Status (12)
Country | Link |
---|---|
JP (1) | JPS51420B1 (en) |
AR (1) | AR197084A1 (en) |
BE (1) | BE784082A (en) |
BR (1) | BR7203223D0 (en) |
CA (1) | CA966544A (en) |
DD (1) | DD95602A5 (en) |
DE (1) | DE2225500A1 (en) |
ES (2) | ES403017A1 (en) |
FR (1) | FR2139953B1 (en) |
GB (1) | GB1384167A (en) |
IT (1) | IT951834B (en) |
NL (1) | NL7207137A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53112444A (en) * | 1977-03-10 | 1978-09-30 | Triumph Werke Nuernberg Ag | Circuit for generating regulated voltage |
NL7709617A (en) * | 1977-09-01 | 1979-03-05 | Philips Nv | COLOR TELEVISION PICTURE TUBE. |
-
1972
- 1972-04-08 IT IT2294972A patent/IT951834B/en active
- 1972-04-14 CA CA139,777A patent/CA966544A/en not_active Expired
- 1972-04-25 DD DD16255872A patent/DD95602A5/xx unknown
- 1972-05-17 AR AR24205172A patent/AR197084A1/en active
- 1972-05-20 ES ES403017A patent/ES403017A1/en not_active Expired
- 1972-05-22 BR BR322372A patent/BR7203223D0/en unknown
- 1972-05-23 GB GB2410472A patent/GB1384167A/en not_active Expired
- 1972-05-25 DE DE19722225500 patent/DE2225500A1/en active Pending
- 1972-05-26 BE BE784082A patent/BE784082A/en unknown
- 1972-05-26 NL NL7207137A patent/NL7207137A/xx unknown
- 1972-05-26 FR FR7218846A patent/FR2139953B1/fr not_active Expired
- 1972-05-27 JP JP5288572A patent/JPS51420B1/ja active Pending
- 1972-09-08 ES ES406493A patent/ES406493A1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE784082A (en) | 1972-09-18 |
AU4250272A (en) | 1973-11-22 |
JPS51420B1 (en) | 1976-01-08 |
NL7207137A (en) | 1972-11-30 |
AR197084A1 (en) | 1974-03-15 |
FR2139953A1 (en) | 1973-01-12 |
DD95602A5 (en) | 1973-02-12 |
ES406493A1 (en) | 1975-07-16 |
DE2225500A1 (en) | 1972-12-07 |
IT951834B (en) | 1973-07-10 |
BR7203223D0 (en) | 1973-06-14 |
CA966544A (en) | 1975-04-22 |
FR2139953B1 (en) | 1977-12-23 |
ES403017A1 (en) | 1975-11-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |