GB712237A - Improvements in or relating to cathode ray tubes for color television - Google Patents
Improvements in or relating to cathode ray tubes for color televisionInfo
- Publication number
- GB712237A GB712237A GB7395/51A GB739551A GB712237A GB 712237 A GB712237 A GB 712237A GB 7395/51 A GB7395/51 A GB 7395/51A GB 739551 A GB739551 A GB 739551A GB 712237 A GB712237 A GB 712237A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screen
- electrodes
- colour
- mask
- recesses
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/16—Picture reproducers using cathode ray tubes
- H04N9/22—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information
- H04N9/26—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information using electron-optical colour selection means, e.g. line grid, deflection means in or near the gun or near the phosphor screen
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Abstract
712,237. Colour televsion tubes. CHROMATIC TELEVISION LABORATORIES, Inc. March 30, 1951 [April 25, 1950], No. 7395/51. Class 39(1) A colour television receiver has a target 25, Fig. 4, formed with a plurality of recesses 27, each recess having a phosphor 35 emitting one colour at the bottom thereof and further phosphor coatings 35<SP>1</SP>, 35<SP>11</SP> emitting other colours deposited successively on the sides thereof, the distance between the centres of adjacent recesses is as small as or smaller than the area of a picture point, and deflecting electrodes 37 additional to the scanning means are provided adjacent to the target for colour switching. The electrodes 37 are narrow strips and are preferably alternately positive and negative. The beam will normally impinge on the green phosphor at the bottom of each recess but by applying a moderate potential difference between pairs of adjacent electrodes 37 the beam contacts the red phosphor and with a higher potential difference contacts the blue phosphor. Electrodes 37 are energized by an oscillator which may or may not provide an additional D.C. bias to modify the rate and sequence of the scan. In modified forms the recesses may be of triangular form and a separate apertured mask disposed in front of the screen, Fig. 5 (not shown), or the mask may be formed integrally with such a screen, Fig. 6 (not shown). The strip deflecting electrodes may be fused at one end to the screen and be formed with mask portions at the other end, Fig. 7 (not shown). One or more positively biased focusing electrodes may be disposed between each pair of deflecting electrodes, the collecting electrodes having a relatively negative and varying potential, Figs. 8, 9 (not shown). in which case the mask may be dispensed with. The strip deflecting electrodes, and focusing electrodes if provided are carried by glass supports 38, Fig. 3, and the structure is strengthened by mica combs 40. Members 44 serve as supports and leads. The tube has one or more focusing and accelerating electrodes and horizontal and vertical scanning coils and the scanning lines may be horizontal, vertical or diagonal. The colour controlling potentials applied to the strip deflecting electrodes may be in field, line or dot sequence. For line or field sequences square wave oscillators, preferably with a D.C. bias, are used. The screen may or may not form the tube end wall. The mask may be formed with Lenard windows of thin foil instead of aoertures, and the screen recesses, permeable mask portions and mica combs are given different inclinations so as to all face the centre of deflection. Instead of a single piece of glass with roundbottomed recesses as in Fig. 1, the screen may be made of alternate wide and narrow strips as indicated by the dotted lines 33 in which case the bottoms may be rounded or flat. A filter may be disposed between the red phosphor and the glass screen as a ruby' coating 46 to correct the colour which by itself is unsatisfactory. The screen may have a reflecting coating of aluminium between the phosphors and the gun e.g. it may be applied to screen faces 31, Fig. 4. Total internal reflection in the screen may also be used to increase the light output.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US157943A US2751516A (en) | 1950-04-25 | 1950-04-25 | Polychrome cathode ray tube |
Publications (1)
Publication Number | Publication Date |
---|---|
GB712237A true GB712237A (en) | 1954-07-21 |
Family
ID=22565998
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7395/51A Expired GB712237A (en) | 1950-04-25 | 1951-03-30 | Improvements in or relating to cathode ray tubes for color television |
Country Status (6)
Country | Link |
---|---|
US (1) | US2751516A (en) |
BE (1) | BE502696A (en) |
DE (1) | DE919353C (en) |
FR (1) | FR1037667A (en) |
GB (1) | GB712237A (en) |
NL (1) | NL160445B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3514287A (en) * | 1961-10-09 | 1970-05-26 | Rca Corp | Photographic method for making tri-colored cathode ray screen |
US3223872A (en) * | 1962-08-13 | 1965-12-14 | Paramount Pictures Corp | Color screen with electron- and lightabsorptive material separating adjacent color strips |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB443896A (en) * | 1934-10-06 | 1936-03-10 | Gen Electric Co Ltd | Improvements in or relating to television |
NL57286C (en) * | 1938-07-11 | |||
US2307188A (en) * | 1940-11-30 | 1943-01-05 | Rca Corp | Television system |
US2481839A (en) * | 1944-08-05 | 1949-09-13 | Rca Corp | Color television |
US2461515A (en) * | 1945-07-16 | 1949-02-15 | Arthur B Bronwell | Color television system |
US2529485A (en) * | 1945-10-09 | 1950-11-14 | Thornton W Chew | Color television |
US2446791A (en) * | 1946-06-11 | 1948-08-10 | Rca Corp | Color television tube |
US2532511A (en) * | 1946-11-16 | 1950-12-05 | Okolicsanyi Ferene | Television |
NL72939C (en) * | 1947-07-02 | |||
US2518200A (en) * | 1947-10-03 | 1950-08-08 | Rca Corp | Television system |
US2480548A (en) * | 1948-08-02 | 1949-08-30 | William H Carhart | Vehicle tire |
-
0
- NL NL6818183.A patent/NL160445B/en unknown
- BE BE502696D patent/BE502696A/xx unknown
-
1950
- 1950-04-25 US US157943A patent/US2751516A/en not_active Expired - Lifetime
-
1951
- 1951-03-30 GB GB7395/51A patent/GB712237A/en not_active Expired
- 1951-04-07 FR FR1037667D patent/FR1037667A/en not_active Expired
- 1951-04-25 DE DEC4105A patent/DE919353C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1037667A (en) | 1953-09-22 |
US2751516A (en) | 1956-06-19 |
BE502696A (en) | |
DE919353C (en) | 1954-10-21 |
NL160445B (en) |
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