US3486061A - Cathode-ray tube for displaying color pictures - Google Patents
Cathode-ray tube for displaying color pictures Download PDFInfo
- Publication number
- US3486061A US3486061A US693554A US3486061DA US3486061A US 3486061 A US3486061 A US 3486061A US 693554 A US693554 A US 693554A US 3486061D A US3486061D A US 3486061DA US 3486061 A US3486061 A US 3486061A
- Authority
- US
- United States
- Prior art keywords
- cathode
- apertures
- ray tube
- mask
- line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
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
- H01J29/06—Screens for shielding; Masks interposed in the electron stream
- H01J29/07—Shadow masks for colour television tubes
- H01J29/076—Shadow masks for colour television tubes characterised by the shape or distribution of beam-passing apertures
Definitions
- a cathode-ray tube for producing color images employing a color selection electrode having a plurality of apertures arranged systematically in rows through each of which an electron beam passes and strikes a phosphor causing it to luminesce.
- the invention relates to a cathode-ray tube for displaying color pictures which is provided with at least one electron gun which produces a number of electron beams which scan in lines a color selection electrode provided with systematically arranged apertures and which strike parts of the display screen.
- each electron beam causes a given luminescent material present on the display screen of the tube to luminesce and the color selection electrode (generally referred to as the mask) prevents these electrons from reaching one of the other luminescent materials.
- the apertures also lie systematically arranged in rows in given directions.
- the occurrence of moire patterns is considerable if the minimum angle between the direction at right angles to the scanning lines on the screen and the rows of sequential apertures in the shadow mask is approximately 30, whereas the moire patterns are eliminated if the said angle is approximately 0.
- the invention is based on the discovery that these disadvantages do not occur at all or substantially not at all if an angle relation different from 0 is chosen.
- the occurrence of moire patterns then no longer depends upon the chosen ratio between the relative distance of the mask apertures and the line distance.
- the minimum angle between the direction at right angles to the scanning lines on the display screen and the rows of sequential apertures in the color selection electrode lies between 5 and 10.
- the minimum angle between the direction at right angles to the scanning lines on the screen and the rows of sequential apertures in the shadow mask lies between 5 and 10
- An analogous solution applies to the case in which a number of electron beams different from three is produced, or in which the electron beams are differently arranged with respect to each other.
- FIGURE 1 is a partly developed view of a shadow-mask color tube
- FIG. 2 shows, not to scale, the geometric relation between the electron beams, the shadow mask, and the phosphor screen.
- the neck 2 of a shadow-mask tube 1 accommodates three electron guns 3, 4 and 5.
- the display screen is disposed on the inner side of the window 6.
- the screen has blue, green and red phosphor dots.
- the shadow mask 7, in which the apertures are provided in a hexagonal pattern, is arranged at a short distance from the window 6. These apertures are not shown to scale.
- Reference numeral 8 denotes diagrammatically the deflection system which deflects the beams 9, 10 and 11 emitted by the electron guns in two orthogonal directions.
- FIG. 2 shows part of the window 6 and the blue, green and red phosphor dots applied thereto, which are denoted by B, G and R respectively.
- Part of the shadow mask 7 is also shown.
- Reference numeral 12 denotes the center in the deflection plane of the three electron beams.
- the axes of the beams are shown: reference numeral 13 denotes the axis of the beam striking the blue phosphor dots, reference numeral 14 denotes the axis of the beam striking the green phosphor dots, and reference numeral 15 denotes the axis of the beam striking the red phosphor dots.
- the beams pass through the aperture 16 in the shadow mask.
- the direction of the scanning lines described by the beams on the shadow mask 7 is designated by the arrow 17.
- the line 18 is at right angles thereto and the line 19 interconnects two sequential apertures.
- the lines 18 and 19 are at an angle to each other of 7.
- the line 20 which interconnects the points of intersection of the axes 14 and 15 with the deflection plane crosses the line 19 at right angles.
- a cathode-ray tube for displaying color pictures comprising at least one electron gun for generating a plurality of electron beams each of which intersect a plane of deflection with the points of intersection of two beams being joined by a line having a given direction, a color selection electrode having a plurality of apertures systematically arranged in rows which are scanned in lines by the electron beams parallel to said given direction, a display screen having portions which luminesce in different colors when struck by an incident electron beam 4 passing through an aperture in the color selection electrode, a line in a direction at right angles to the scanning lines on the display screen and a line joining a row of sequential apertures in the color selection electrode forming an angle lying betwen 5 and 10.
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL676700444A NL149323B (nl) | 1967-01-12 | 1967-01-12 | Elektronenstraalbuis voor het weergeven van kleurenbeelden. |
Publications (1)
Publication Number | Publication Date |
---|---|
US3486061A true US3486061A (en) | 1969-12-23 |
Family
ID=19798965
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US693554A Expired - Lifetime US3486061A (en) | 1967-01-12 | 1967-12-26 | Cathode-ray tube for displaying color pictures |
Country Status (9)
Country | Link |
---|---|
US (1) | US3486061A (fr) |
AT (1) | AT276503B (fr) |
BE (1) | BE709170A (fr) |
CH (1) | CH474149A (fr) |
DE (1) | DE1537284A1 (fr) |
ES (1) | ES349039A1 (fr) |
FR (1) | FR1550860A (fr) |
GB (1) | GB1146140A (fr) |
NL (1) | NL149323B (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4370591A (en) * | 1979-09-14 | 1983-01-25 | Hitachi, Ltd. | Color picture tube shadow mask |
EP0194724A1 (fr) * | 1985-03-14 | 1986-09-17 | Koninklijke Philips Electronics N.V. | Tube image couleur |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4218698A (en) * | 1978-03-13 | 1980-08-19 | Rca Corporation | TV Graphics and mixing control |
BG47787A1 (en) * | 1988-03-14 | 1990-09-14 | Sofija Televizija | Device for input of symbols in programme television signal |
CA2010680A1 (fr) * | 1989-04-17 | 1990-10-17 | Isaac M. Bell | Commutateur video |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2669672A (en) * | 1953-03-10 | 1954-02-16 | Sam H Kaplan | Color image target structure |
US2967971A (en) * | 1957-08-14 | 1961-01-10 | Hughes Aircraft Co | Storage tube with improved flood gun |
US2971117A (en) * | 1956-03-01 | 1961-02-07 | Rca Corp | Color-kinescopes, etc. |
US3005921A (en) * | 1958-01-27 | 1961-10-24 | Rca Corp | Cathode-ray tubes of the focus-mask variety |
US3109116A (en) * | 1956-05-16 | 1963-10-29 | Rca Corp | Color-kinescope of the shadow mask variety |
-
1967
- 1967-01-12 NL NL676700444A patent/NL149323B/xx unknown
- 1967-12-16 DE DE19671537284 patent/DE1537284A1/de active Pending
- 1967-12-26 US US693554A patent/US3486061A/en not_active Expired - Lifetime
-
1968
- 1968-01-09 ES ES349039A patent/ES349039A1/es not_active Expired
- 1968-01-09 GB GB1253/68A patent/GB1146140A/en not_active Expired
- 1968-01-09 CH CH28168A patent/CH474149A/de not_active IP Right Cessation
- 1968-01-09 AT AT19168A patent/AT276503B/de active
- 1968-01-10 BE BE709170D patent/BE709170A/xx unknown
- 1968-01-12 FR FR1550860D patent/FR1550860A/fr not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2669672A (en) * | 1953-03-10 | 1954-02-16 | Sam H Kaplan | Color image target structure |
US2971117A (en) * | 1956-03-01 | 1961-02-07 | Rca Corp | Color-kinescopes, etc. |
US3109116A (en) * | 1956-05-16 | 1963-10-29 | Rca Corp | Color-kinescope of the shadow mask variety |
US2967971A (en) * | 1957-08-14 | 1961-01-10 | Hughes Aircraft Co | Storage tube with improved flood gun |
US3005921A (en) * | 1958-01-27 | 1961-10-24 | Rca Corp | Cathode-ray tubes of the focus-mask variety |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4370591A (en) * | 1979-09-14 | 1983-01-25 | Hitachi, Ltd. | Color picture tube shadow mask |
EP0194724A1 (fr) * | 1985-03-14 | 1986-09-17 | Koninklijke Philips Electronics N.V. | Tube image couleur |
US4751425A (en) * | 1985-03-14 | 1988-06-14 | U.S. Phillips Corporation | Color display tube with line screen having reduced moire |
Also Published As
Publication number | Publication date |
---|---|
CH474149A (de) | 1969-06-15 |
GB1146140A (en) | 1969-03-19 |
ES349039A1 (es) | 1969-04-01 |
DE1537284A1 (de) | 1970-07-23 |
NL6700444A (fr) | 1968-07-15 |
AT276503B (de) | 1969-11-25 |
BE709170A (fr) | 1968-07-10 |
FR1550860A (fr) | 1968-12-20 |
NL149323B (nl) | 1976-04-15 |
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