US3393336A - Three gun color tube with central gun of smaller cross-section than lateral guns - Google Patents

Three gun color tube with central gun of smaller cross-section than lateral guns Download PDF

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Publication number
US3393336A
US3393336A US550819A US55081966A US3393336A US 3393336 A US3393336 A US 3393336A US 550819 A US550819 A US 550819A US 55081966 A US55081966 A US 55081966A US 3393336 A US3393336 A US 3393336A
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US
United States
Prior art keywords
gun
guns
tube
lateral
screen
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
US550819A
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English (en)
Inventor
France Henri De
Cahen Roger
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.)
Compagnie Francaise de Television SA
Original Assignee
Cft Comp Fse Television
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 Cft Comp Fse Television filed Critical Cft Comp Fse Television
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/2222—Prompting
    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/20—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours
    • H01J31/201—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode
    • H01J31/203—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode with more than one electron beam
    • H01J31/206—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode with more than one electron beam with three coplanar electron beams

Definitions

  • the present invention relates to tricolour television receiver tubes, comprising a screen with red, green and blue phosphor elements and three guns, namely the red gun, the green gun and the blue gun, for reproducing the optical red, green and blue components of the picture through the impact of their respective beams on the phosphor elements of the corresponding colours.
  • a television cathode ray tube having a screen with phosphor elements of three colours, one of which is blue, and three guns respectively associated with the phosphor elements of each colour, wherein the diameter of the gun associated with the blue phosphor elements is markedly smaller than the diameter of the other two guns.
  • FIGURE 1 shows a tricolour tube of known construction
  • FIGURE 2 is a vertical section of the gun arrangement of the tube of FIGURE 1;
  • FIGURES 3, 4 and 5 show in vertical section the arrangement of the guns according to the present invention.
  • the tube of FIGURE 1 is a tube with vertical phosphor strips, with focusing grid and three guns, wherein the grid and the screen are flat and rectangular.
  • Screen 2 comprises regularly repeated red, blue and green strips, R, B, and G, wherein three adjacent strips of different colours form a triplet.
  • the drawing shows only a few phosphor strips whose dimensions have been exaggerated to make the drawing clearer.
  • the tube comprises a large number of triplets, each of which corresponds to one picture point on each line of the picture.
  • the tube envelope 1 has a conductive coating 9, forming the second anode of the tube.
  • the socalled correction electrode which is assumed in the drawing to be formed from a metal frame but which may also be formed by a conductive coating on the wall of the envelope, insulated from the coating 9.
  • the tube also comprises a conventional electromagnetic deflector 7, identical to that of monochrome tubes and shown only partly in the drawing.
  • a conventional electromagnetic deflector 7 identical to that of monochrome tubes and shown only partly in the drawing.
  • the screen 2 is brought to a potential Ve which is high relative to that of the cathodes of the guns and the grid 3 is brought to a lower positive potential Vg; the grid-screen assembly forms a system of convergent cylindrical lenses for the electron beams coming from the guns.
  • the conductive coating 9 on the inner wall of the tube has a potential equal to the highest potential of the guns and the grid potential Vg is substantially equal thereto.
  • the beams coming from the guns 4, 5 and 6, referred to respectively as the red gun, the blue gun and the green gun, are modulated by the red, blue and green signals.
  • the three beams are deflected from their straight paths and sweep the screen line by line, perpendicularly to the grid wires and to the phosphor strips.
  • This simultaneous sweeping is effected at any moment in such a way that the three beams respectively issued from the red, blue and green guns, after converging at a point P substantially in the plane of the grid, impinge respectively on the red, blue and green strips of the same triplet.
  • This tube is known in the art and, as described, so far, presents no special novel feature except that generally the blue gun is not the centre gun and that the blue strip is generally not the centre strip of the triplets defined by the grid wires. It is shown only by way of non-limitative example of tricolor tubes to which the invention is applicable.
  • the axes of the three guns must be the nearer to each other, the narrower are the strips while, for reasons of compactness, it is not desirable to enlarge the tube.
  • the spot of a beam will be the finer, which is desirable for the horizontal and vertical definition of the picture, the greater is the diameter of the three guns, and from this point of View it is undesirable to go below 8 or 9 mm.
  • a gun arrangement is generally adopted in which the centre gun is placed slightly higher than the two other guns which makes the electronic optics of the tube more complicated.
  • the present invention is based on the following fact:
  • FIGS. 2 and 3 show the section in a vertical plane near that end of the guns which faces the grid, of a conventional three gun arrangement with 9 mm. diameter gun and of an arrangement according to the invention with two lateral 9 mm. diameter guns and one central 5 mm. diameter gun.
  • FIGS. 2 and 3 show the section in a vertical plane near that end of the guns which faces the grid, of a conventional three gun arrangement with 9 mm. diameter gun and of an arrangement according to the invention with two lateral 9 mm. diameter guns and one central 5 mm. diameter gun.
  • the scales has been doubled for the sake of clarity.
  • the sections of the axes of the guns are marked by a cross.
  • the invention is not limited to a tube of the type hereinbefore described or to a tube with a screen with vertical strips or more generally to a tube with a screen with strips. It may also be used with a screen with oblique phosphor strips horizontally swept by the three beams, with a screen with horizontal phosphor strips or with a screen with phosphor dots.
  • the invention also applies to three guns with axes in the same vertical plane or in a plane in any direction.
  • the invention may be used not only with three guns with coplanar axes but also with guns in which the axes of the two lateral guns are in the same, for example, horizontal plane and the centre gun with a smaller diameter has an axis which is not in this plane.
  • FIGS. 4 and 5 show cross-sections of arrangements for guns of this type.
  • a color television picture tube having an axis and including a screen having red, green and blue phosphorescent element s arranged in strips approximately 0.25 millimeter wide, a central electron gun and two lateral guns closely adjacent to said central gun, said guns having substantially the same axial length and each gun being adapted to emit an electron'beam, means for deflecting said beams so as.
  • said deflecting means including means for directing said beams respectively to said red, blue and green elements only, said central gun havingan axis substantially coinciding with the axis of said tube, said lateral guns'having respective axes spaced from said coinciding axesin opposite directions and in a commonplane' therewith, said lateral guns each having a diameter of at least eight millimeters,
  • said central gun having across-section substantially smaller than the cross-section of each of said lateral guns, and said deflecting means'including-means for directing the beam of said central gun to saidblue elementsonly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Optical Filters (AREA)
  • Glass Compositions (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US550819A 1965-05-20 1966-05-17 Three gun color tube with central gun of smaller cross-section than lateral guns Expired - Lifetime US3393336A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR17727A FR1444190A (fr) 1965-05-20 1965-05-20 Perfectionnements aux tubes récepteurs de télévision en couleurs

Publications (1)

Publication Number Publication Date
US3393336A true US3393336A (en) 1968-07-16

Family

ID=8579250

Family Applications (1)

Application Number Title Priority Date Filing Date
US550819A Expired - Lifetime US3393336A (en) 1965-05-20 1966-05-17 Three gun color tube with central gun of smaller cross-section than lateral guns

Country Status (9)

Country Link
US (1) US3393336A (nl)
AT (1) AT259642B (nl)
BE (1) BE680667A (nl)
CH (1) CH435367A (nl)
ES (1) ES326883A1 (nl)
FR (1) FR1444190A (nl)
GB (1) GB1102136A (nl)
NL (1) NL6606940A (nl)
SE (1) SE300839B (nl)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3579016A (en) * 1967-10-23 1971-05-18 Gen Telephone & Elect Postdeflection tube with all rare earth phosphors
US3663854A (en) * 1969-02-17 1972-05-16 Tokyo Shibaura Electric Co Shadow-mask having rectangular apertures
DE2241729A1 (de) * 1971-08-27 1973-03-08 Tokyo Shibaura Electric Co Farbkathodenstrahlroehre
US4181870A (en) * 1978-03-08 1980-01-01 Zenith Radio Corporation Assembly of electron guns having different gamma values
US4829414A (en) * 1986-11-29 1989-05-09 Goldstar Co., Ltd. Circuit for generating a constant high voltage for CRT deflection in response to multi-frequency horizontal sync input signal
US6144143A (en) * 1998-02-03 2000-11-07 Horng; Herng-Er Cyclotron displays

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2825847A (en) * 1955-05-12 1958-03-04 Philips Corp Cathode-ray tube for the reproduction of colour television images
US2850658A (en) * 1956-02-21 1958-09-02 Rca Corp Non-symmetrical cathodes in cathode ray tubes
US2898491A (en) * 1955-02-12 1959-08-04 Emi Ltd Cathode ray tubes
US2951178A (en) * 1955-01-07 1960-08-30 Philco Corp Multi-beam cathode-ray tube transducer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2951178A (en) * 1955-01-07 1960-08-30 Philco Corp Multi-beam cathode-ray tube transducer
US2898491A (en) * 1955-02-12 1959-08-04 Emi Ltd Cathode ray tubes
US2825847A (en) * 1955-05-12 1958-03-04 Philips Corp Cathode-ray tube for the reproduction of colour television images
US2850658A (en) * 1956-02-21 1958-09-02 Rca Corp Non-symmetrical cathodes in cathode ray tubes

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3579016A (en) * 1967-10-23 1971-05-18 Gen Telephone & Elect Postdeflection tube with all rare earth phosphors
US3663854A (en) * 1969-02-17 1972-05-16 Tokyo Shibaura Electric Co Shadow-mask having rectangular apertures
DE2241729A1 (de) * 1971-08-27 1973-03-08 Tokyo Shibaura Electric Co Farbkathodenstrahlroehre
US4181870A (en) * 1978-03-08 1980-01-01 Zenith Radio Corporation Assembly of electron guns having different gamma values
US4829414A (en) * 1986-11-29 1989-05-09 Goldstar Co., Ltd. Circuit for generating a constant high voltage for CRT deflection in response to multi-frequency horizontal sync input signal
US6144143A (en) * 1998-02-03 2000-11-07 Horng; Herng-Er Cyclotron displays

Also Published As

Publication number Publication date
NL6606940A (nl) 1966-11-21
ES326883A1 (es) 1967-03-16
BE680667A (nl) 1966-10-17
GB1102136A (en) 1968-02-07
AT259642B (de) 1968-01-25
CH435367A (fr) 1967-05-15
DE1462481A1 (de) 1968-12-05
FR1444190A (fr) 1966-07-01
DE1462481B2 (de) 1975-10-23
SE300839B (nl) 1968-05-13

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