US3906279A - Cathode-ray tube for displaying coloured pictures - Google Patents

Cathode-ray tube for displaying coloured pictures Download PDF

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Publication number
US3906279A
US3906279A US418582A US41858273A US3906279A US 3906279 A US3906279 A US 3906279A US 418582 A US418582 A US 418582A US 41858273 A US41858273 A US 41858273A US 3906279 A US3906279 A US 3906279A
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United States
Prior art keywords
electron
tube
electrode
cathode
guns
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Expired - Lifetime
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US418582A
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English (en)
Inventor
Henricus Wilhelmus Mar Linssen
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US Philips Corp
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US Philips Corp
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    • 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
    • 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

Definitions

  • the invention relates to a cathode-ray tube for displaying color pictures and comprising in an evacuated envelope: three electron guns the axes of which are parallel to the main axis of the tube for producing three electron beams, a color selection electrode comprising a multitude of apertures, a display screen having three patterns of regions luminescing in different colors, and means for converging the three electron beams so that they intersect each other near the color selection electrode, which electron beams each are assigned to one of the said patterns by means of the color selection electrode, which electron guns each comprise at least a cathode, a control grid and an anode and furthermore a last electrode taken from the cathode which has the form of a mainly cylindrical sleeve, at least two of the said electron guns having an axis which is ecentric relative to the
  • Such a cathode-ray tube is known from the US. Pat. No. 3,01 1,090.
  • the said US. patent states a drawback of this that the guns have to be positioned very accurately in the tube.
  • Another drawback is that the electrodes of the three guns are assembled on three assembling pins which thus have to enclose a very accurely determined angle relative 'to each other.
  • the invention furthermore provides a very simple construction for converging three electron beams from three assembled electron guns which operate independently of each other and the axes of which are parallel.
  • a cathode-ray tube of the type mentioned in the preamble is characterized in that the last electrode of each electron gun which is eccene tric relative'to the main axis of the tube has an axis which is eccentric relative to the axis vof the assigned electron gun in a plane passing through the main axis of the tube and the axis of the assigned electron gun and at a larger distance from the main axis of the tube than the axis of the electron gun and that the said last electrode hasan inner diameter which is at least equal to the largest inner diameter of any other electrode of the electron gun increased by twice the distance between the axes of the last electrode and the electron gun.
  • the invention relates in particular to sucha cathoderay tube having-three electron guns the axes of which are in one plane and one axis coincides-with the main axis of the tube which is characterized in that the axis" of the last electrode of the electron gun-the axis of which coincides with the main axis of the tube, coincides with the axis of the electron gun.
  • the invention also relates to a cathodeway tube having three guns in a triangular arrangement which is characterized in that the last electrodes of the three electron guns have the same inner diameter.
  • FIG. 1 shows a cathode-r'ay'tube according to the invention
  • FIG. 2 shows the three electron guns of the tube of FIG. 1 in their mutual arrangement
  • FIG/ 3 shows the three electron guns of a known cathode-ray tube during assembly
  • FIG.-4 sho'ws the three electron guns of a cathode-ray tube according to the inventionduringassembly.
  • the tubeshown inFIG. 1 comprises in an evacuated glass envelope 1 a set of electron guns 2, a colour'selection electrode 3 and a display screen 4. Outside the envelope l of the tube are shown a set of deflection coils 5 which serve for the deflection across the display screen 4 of the electron beams produced by the electron guns 2, In. known manner, which need not befurther explained, one of the electron beams impinges, via the apertures 6 in the colourseleetion electrode 3,'only upon regions having red luminescing phosphor of the display screen 4, the second electron beam impinges only upon regions having green phosphor and the third electron beam impinges only upon regions having blue phosphor.
  • the main axis of the tube is denoted by the reference numeral 7.
  • FIG. 2 shows the set of electron guns 2 in greater detail. It comprises three electron guns I0, 20 and 30, the axes 17, 27 and 37 of which are parallel to each other.
  • the electron gun l0. comprises a cathode l2 having a filament l l, a control grid 13, and anode 14, a focusing electrode 15 and an accelerating electrode 16.
  • Thecorrespondingelectrodes of the electron gun 20 are denoted by reference numerals 21 ;to 26.
  • the corresponding electrodesof the electron gun 30 aredenoted by reference numerals 31 to 36.
  • the electron guns 10, 20 and 30 are secured to glass supporting rods so as to be immovable relative to each other by means of connection lugs sealed in the supporting rods.
  • the axes 17, 27 and I 37 of the electron guns are in one plane.
  • the electron guns 10, 20 and 30 have a thriangular arrangement, that is to say that the points of intersection of the axes of the electron guns with a plane normal to the main axis of the tube form an equilateral triangle having the point of intersection of the main axis of the tube as center of gravity.
  • the acceleration electrodes 16 and 36 have a slightly larger diameter than the focusing electrodes 15 and 35, while the axes l8 and 38 of the electrodes 16 and 36 are also eccentric relative to the axes l7 and 37.
  • the electric field between the electrodes I5 and 16 and 35 and 36, respectively, thus has such a shape that the electron beams produced by the electron guns and 30 are deflected towards the electron beam produced by the electron gun 20.
  • the three beams intersect each other at the area of the colour selection electrode 3. In the case of three electron guns in a triangular arrangement, the electron beams are deflected towards each other in a quite analogous manner.
  • the stated eccentricity is so small that the devia tion from the rotational symmetry of the electric field between the electrodes and 16 and 35 and 36, respectively, has a detrimental influence on the structure of the electron beams individually.
  • the largest inner diameter of the electrodes 15, and 35 is 7.6 mm.
  • the inner diameter of the electrode 26 is also 7.6 mm.
  • the inner diameter of the electrodes 16 and 36 is 8.2 mm.
  • the eccentricity of the electrodes 16 and 36 that is to say the distance between the axes l7 and 18 and 37 and 38, respectively, is 0.3 mm.
  • the axes 27 and 28 coincides. In the case of three elec tron guns in a triangular arrangement, all the acceleration electrodes are eccentric relative to the corresponding focusing electrodes.
  • FIG. 3 shows three electron guns of a known cathoderay tube during their assembly.
  • Three assembly pins 41, 42 and 43 are secured in a block 40.
  • the axes of the pins 41 and 43 intersect each other in a point on the axis of the pin 42.
  • the diameter of the pins 41, 42 and 43 becomes smaller stepwise towards their end.
  • FIG. 3 shows how this is used to assemble the electrodes of an electron gun on a pin.
  • Temporarily provided spacing members 44 are also used. In FIG. 3, the electron gun on the pin 42 is still to be assembled.
  • the electrodes which are provided with connection strips not shown are sealed in glass supporting rods by means of said strips.
  • the three electron guns then form one assembly and it is obvious that, for being able to remove the pins 41, 42 and 43 from the guns, it is necessary first to remove the pins 41, 42 and 43 from the block 40, only after which they can be withdrawn from the guns. This requires a large number of operations and in addition produces detrition so that the angle between the pins 41, 42 and 43 becomes inacurate.
  • FIG. 4 shows three electron guns of a cathode-ray tube according to the invention during their assembly.
  • Three assembly pins 51, 52 and 53 are secured in a block 50.
  • the axes of the pins 51, 52 and 53 are parallel.
  • the diameter of the pins 51, 52 and 53 becomes smaller stepwise towards their ends. In this case also,
  • spacing members 54 are used. After providing all the electrodes. the electrodes which are provided with connection strips not shown are sealed in glass supporting rods by means of said strips. The three electron guns then form one assembly and it is obvious that they can be collectively removed from the assembly pins 51, 52 and 53, said assembly pins remaining secured in the block 50.
  • a cathode-ray tube for displaying color pictures comprising in an evacuated envelope: three electron guns the axes of which are parallel to the main axis of the tube for producing three electron beams, a color selection electrode comprising a multitude of apertures, a display screen having three patterns of regions luminescing in different colors, means for converging the three electron beams so that they intersect each other near the color selection electrode, each of said electron beams being assigned to one of the said patterns by means of the color selection electrode, each of said electron guns comprising a set of successively arranged electrodes including at least a cathode. a control grid, an anode and an additional last electrode which has the form of a substantially cylindrical sleeve.
  • At least two electron guns having respectively, a center axis which is eccentric relative to the main axis of the tube, the last electrode of each of said two eccentric electron guns having a center axis which is eccentric relative to the center axis of the assigned electron gun in a plane through the main axis of the tube and the center axis of the assigned electron gun and at a larger distance from the main axis of the tube than is the axis of the assigned electron gun, and said last electrode having an inner diameter which is larger than the largest inner diameter of any other electrode of the assigned electron gun.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US418582A 1972-12-16 1973-11-23 Cathode-ray tube for displaying coloured pictures Expired - Lifetime US3906279A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7217179A NL7217179A (es) 1972-12-16 1972-12-16

Publications (1)

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US3906279A true US3906279A (en) 1975-09-16

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Family Applications (1)

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US418582A Expired - Lifetime US3906279A (en) 1972-12-16 1973-11-23 Cathode-ray tube for displaying coloured pictures

Country Status (10)

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US (1) US3906279A (es)
JP (1) JPS4990870A (es)
BE (1) BE808659A (es)
CA (1) CA979474A (es)
DE (1) DE2358896A1 (es)
ES (1) ES421456A1 (es)
FR (1) FR2327636A1 (es)
GB (1) GB1412839A (es)
IT (1) IT999991B (es)
NL (1) NL7217179A (es)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028581A (en) * 1976-06-24 1977-06-07 Gte Sylvania Incorporated Plural beam electron gun assembly
US4061941A (en) * 1976-06-24 1977-12-06 Gte Sylvania Incorporated CRT electron gun assembly
DE2934993A1 (de) * 1978-09-08 1980-03-20 Philips Nv Farbbildroehre
US4207491A (en) * 1977-03-28 1980-06-10 Tokyo Shibaura Electric Co., Ltd. Electron gun assembly
US4337409A (en) * 1979-05-25 1982-06-29 U.S. Philips Corporation Color display tube with control grid positioning feature
US4499402A (en) * 1981-05-22 1985-02-12 U.S. Philips Corporation Color display tube
US4500808A (en) * 1982-04-02 1985-02-19 Rca Corporation Multibeam electron gun with composite electrode having plurality of separate metal plates
US4605880A (en) * 1984-08-22 1986-08-12 Rca Corporation Multibeam electron gun having a cathode-grid subassembly and method of assembling same
US4607187A (en) * 1984-08-22 1986-08-19 Rca Corporation Structure for and method of aligning beam-defining apertures by means of alignment apertures
US4685891A (en) * 1984-03-23 1987-08-11 U.S. Philips Corporation Method of assembling an integrated electron gun system
US6313575B1 (en) * 1997-01-13 2001-11-06 Kabushiki Kaisha Toshiba Color picture tube

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5038462A (es) * 1973-08-08 1975-04-09
DE2832687C2 (de) * 1978-07-26 1984-01-12 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Elektronenstrahlerzeugungssystem einer Farbbildkathodenstrahlröhre

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850658A (en) * 1956-02-21 1958-09-02 Rca Corp Non-symmetrical cathodes in cathode ray tubes
US3772554A (en) * 1972-01-14 1973-11-13 Rca Corp In-line electron gun

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850658A (en) * 1956-02-21 1958-09-02 Rca Corp Non-symmetrical cathodes in cathode ray tubes
US3772554A (en) * 1972-01-14 1973-11-13 Rca Corp In-line electron gun

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028581A (en) * 1976-06-24 1977-06-07 Gte Sylvania Incorporated Plural beam electron gun assembly
US4061941A (en) * 1976-06-24 1977-12-06 Gte Sylvania Incorporated CRT electron gun assembly
US4207491A (en) * 1977-03-28 1980-06-10 Tokyo Shibaura Electric Co., Ltd. Electron gun assembly
DE2934993A1 (de) * 1978-09-08 1980-03-20 Philips Nv Farbbildroehre
FR2435808A1 (fr) * 1978-09-08 1980-04-04 Philips Nv Perfectionnement au tube image en couleurs
US4337409A (en) * 1979-05-25 1982-06-29 U.S. Philips Corporation Color display tube with control grid positioning feature
US4499402A (en) * 1981-05-22 1985-02-12 U.S. Philips Corporation Color display tube
US4500808A (en) * 1982-04-02 1985-02-19 Rca Corporation Multibeam electron gun with composite electrode having plurality of separate metal plates
US4685891A (en) * 1984-03-23 1987-08-11 U.S. Philips Corporation Method of assembling an integrated electron gun system
US4605880A (en) * 1984-08-22 1986-08-12 Rca Corporation Multibeam electron gun having a cathode-grid subassembly and method of assembling same
US4607187A (en) * 1984-08-22 1986-08-19 Rca Corporation Structure for and method of aligning beam-defining apertures by means of alignment apertures
US6313575B1 (en) * 1997-01-13 2001-11-06 Kabushiki Kaisha Toshiba Color picture tube

Also Published As

Publication number Publication date
JPS4990870A (es) 1974-08-30
ES421456A1 (es) 1976-04-01
BE808659A (fr) 1974-06-14
IT999991B (it) 1976-03-10
FR2327636B1 (es) 1978-03-24
GB1412839A (en) 1975-11-05
CA979474A (en) 1975-12-09
DE2358896A1 (de) 1974-06-20
FR2327636A1 (fr) 1977-05-06
NL7217179A (es) 1974-06-18

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