US3486061A - Cathode-ray tube for displaying color pictures - Google Patents

Cathode-ray tube for displaying color pictures Download PDF

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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
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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
Application number
US693554A
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English (en)
Inventor
Piet Gerard Joseph Barten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
US Philips Corp
Original Assignee
US Philips Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3486061A publication Critical patent/US3486061A/en
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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.

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  • Electrodes For Cathode-Ray Tubes (AREA)
US693554A 1967-01-12 1967-12-26 Cathode-ray tube for displaying color pictures Expired - Lifetime US3486061A (en)

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 (de)
AT (1) AT276503B (de)
BE (1) BE709170A (de)
CH (1) CH474149A (de)
DE (1) DE1537284A1 (de)
ES (1) ES349039A1 (de)
FR (1) FR1550860A (de)
GB (1) GB1146140A (de)
NL (1) NL149323B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4370591A (en) * 1979-09-14 1983-01-25 Hitachi, Ltd. Color picture tube shadow mask
EP0194724A1 (de) * 1985-03-14 1986-09-17 Koninklijke Philips Electronics N.V. Farbbildröhre

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0153555B2 (de) * 1978-03-13 1989-11-14 Rca Licensing Corp
BG47787A1 (en) * 1988-03-14 1990-09-14 Sofija Televizija Device for input of symbols in programme television signal
CA2010680A1 (en) * 1989-04-17 1990-10-17 Isaac M. Bell Video switch arrangement

Citations (5)

* Cited by examiner, † Cited by third party
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4370591A (en) * 1979-09-14 1983-01-25 Hitachi, Ltd. Color picture tube shadow mask
EP0194724A1 (de) * 1985-03-14 1986-09-17 Koninklijke Philips Electronics N.V. Farbbildröhre
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
NL149323B (nl) 1976-04-15
GB1146140A (en) 1969-03-19
ES349039A1 (es) 1969-04-01
DE1537284A1 (de) 1970-07-23
CH474149A (de) 1969-06-15
BE709170A (de) 1968-07-10
FR1550860A (de) 1968-12-20
NL6700444A (de) 1968-07-15
AT276503B (de) 1969-11-25

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