US3546517A - Color tube having venetian blind-type color selection grid and integrally formed baffles on display screen - Google Patents

Color tube having venetian blind-type color selection grid and integrally formed baffles on display screen Download PDF

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Publication number
US3546517A
US3546517A US735025A US3546517DA US3546517A US 3546517 A US3546517 A US 3546517A US 735025 A US735025 A US 735025A US 3546517D A US3546517D A US 3546517DA US 3546517 A US3546517 A US 3546517A
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United States
Prior art keywords
grid
grids
electron
apertures
beams
Prior art date
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Expired - Lifetime
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US735025A
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English (en)
Inventor
Werner Veith
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Siemens AG
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Siemens AG
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Filing date
Publication date
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    • 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
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/187—Luminescent screens screens with more than one luminescent material (as mixtures for the treatment of the screens)
    • 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
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/24—Supports for luminescent material
    • 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
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/30—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines
    • H01J29/32—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines with adjacent dots or lines of different luminescent material, e.g. for colour television
    • 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
    • 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

Definitions

  • the provided grid also has enlarged electron beam receiving apertures therein in relation to the associated grids which are adjacent thereto to facilitate the placement of the apertures in the provided grid in the path of the electron beam thereby obviating the need for close tolerances.
  • This invention relates generally to improvements in cathode ray tubes of the type, as particularly disclosed in US. Pat. No. 3,448,316 which issued on June 3, 1969, in which a single electron gun is provided for emitting a plurality of electron beams to produce a color picture, for example, as in color television receivers. It should be understood, however, that the teachings of this invention are applicable to plural guns for color and to black and white receivers also.
  • the cathodes are each housed within a grid having an aperture therein and this grid is at a potential with respect to the cathode.
  • One or more addi tional grids having apertures therein for the reception of electrons, and also having a desired potential applied thereto are used to accelerate the beam and properly converge it on the electron receiving screen.
  • the grids are spaced from each other axially and radially in a cathode ray tube generally in the neck portion of the tube.
  • the electric fields emitted by the bias placed on the grids can affect another grid which is within its field if'it is not spaced far enough from the field.
  • the amount of space available in the neck of a cathode ray tube does not permit a wide latitude in spacing, and the strength of the field is important as it relates to the grid from which the electron beams are to be properly at tracted. Therefore, when two or more grids must be necessarily close together for proper operation, the deleterious etfects of intergrid interference are present, and a distorted picture on the electron beam receiving screen can result.
  • The; figure is a schematic longitudinal sectional view showing a plurality of cathodes and grids in an: improved plural beam electron gun.
  • cathodes 10, 11 and 12 having respective electron-emit ting surfaces, which are arcuately arranged in a horizontal plane the surfaces being arranged so that perpendiculars thereto converge and extend through the optical center F of the lens.
  • the cathodes are so arranged so as to eliminate the necessity of an auxiliary lens to converge the emitted beams which is more fully discussed in co-pending application Ser. No. 697,414, filed Jan. 12, 1968, and entitled Cathode Ray Tube, which issued on June 13, 1969 as US. Pat. No. 3,448,316.
  • Each cathode has a respective grid 13, 14 and 15 having a potential applied thereto, which can surround the cathode and has an aperiure 16 located approximately in the center of the face in? the grid enabling it to function as a window for an emitted heam B B 1 and B from the respective cathndes.
  • the apertured faces or end walls of the grid 13, 14 and 15 are parallel to and equidistantly adjacent to the respective electron-emitting surfaces of the respective cathodes 1t 11 and 12.
  • a grid 17 having an arcuate face 18 thereon has a plurality of apertures 21 therein each of which receives a respective electron beam.
  • An electrical potential of suitable value is impressed on the grid 17 thereby causing the emitted electrons to converge substantially at an optical center F of a focusing lens L.
  • Additional grids 19 and can be used to produce the desired effects on the emitted electron beams.
  • the grids can be in the form of an enclosure which is open at one end thereof or open at both ends.
  • These grids 17, 19 and 20 comprise an electrostatic focusing lens, and, as disclosed in my previously referred to copending application, now US. Pat. No. 3,448,316, grids 17 and 20 may be at a high potential 1 while grid 19 may be at a low potential.
  • the aforementioned cathodes and grids are located in the neck of a cathode ray tube which is a relatively small miniature television cabinet.
  • the grids 13, 1d, 15 and 17 be brought into close proximity.
  • the electric field which radiates from the grid 17 can thereby affect each grid 13, 14 and 15 in a different manner because of the arcuate arrangement of the grids. For example, the distance from the face of the grid 13 to the point where the emitted beam enters the aperture 21 on the face of the grid 17 is greater than the distance between the face of the grid 14 to the corresponding aperture 21 on grid 17.
  • a grid 22 which may be cup-shaped as shown in the figure, is mounted between the grids 13, 1 5, 15 and 17 preferably close to the cathodes.
  • This grid 22 may have an end wall, portions of which are equidistant from and substantially parallel to the aperttlred faces of the grids 13, 14 and 15, and these end'wall p ortions may be surfaces of revolution such as may be present when the end wall is an arcuate surface concentric with the arcuate surface to which the apertured faces of the grids 1.3, 14 and 15 are tangent.
  • the grid 22 has a plurality of apertures 23 therein which are aligned with the respective apertures 16 in the grids 13, 14 and 15 and which may be larger than these apertures 16. It has been found that if the apertures 23 are approximately twice the size of the apertures 16 that the beneficial results of the invention can be achieved. This will be more fully discussed below.
  • the grid 22 is at ground potential whereby it functions somewhat as a shield for the grids 13, 141 and 15.
  • the effect of placing the grid 22 adjacent the cathode grids 13, 14 and 15 is to effectively apply the same strength electric field to the cathode grids despite their varying distances from the grid 17.
  • the apertures 23 in the grid 22 which is at ground potential, are approximately two or more times the size of the apertures 16 in the cathode grids 13, 14 and 15. It is obvious that the electron beams E B and B emanating from the respective cathodes 1%, 11 and 12 must enter the apertures 23 in the face of the grid 22. Since the size of the openings in the grid 22 are much larger than the openings 16 in the cathode grids 1d, 11 and 12, the criticality of locating the openings in the grid 22 in line with the beams from the cath- 4 odes 10, 11 and 12 is greatly diminished. If the grid 22 is not perfectly placed in relation to the cathode grids 1t), 11 and 12 the beams B B and B will still pass through the openings 23 in the grid 22 because they now have a larger area into which they can pass.
  • a single-gun, plural-beam cathode ray tube comprising an electron-receiving screen, a plurality of spaced cathodes for generating respective beams and having electron emitting surfaces arranged so that perpendiculars thereto converge and cross each other at a point in said tube intermediate said cathodes and said screen with said electron emitting surfaces being substantially equidistant from said point, electrostatic focusing lens means com mon to all of said beams to focus the latter on said screen, said lens means having an optical center and being located to dispose said optical center substantially at said point, first control grids respectively associated with said cathodes and including end walls parallel and equidistantly adjacent to said electron emitting surfaces of the respective cathodes, said end Walls of the first control grids having apertures for the passage therethrough of the respective beams, and a common second grid interposed between and spaced from said first control grids and said electrostatic focusing lens means, said second grid being cup-shaped and including an end wall, portions of which are e
  • a cathode ray tube in which said apertures of the second grid are substantially larger than said apertures of the first control grid to ensure free passage of said beams through said apertures of the sec- 0nd grid even when the apertures of said first and second grids are imprecisely aligned.
  • a cathode ray tube according to claim 2 in which said apertures of the second grid are at least twice as large as the respective apertures in said first grids.
  • a cathode ray tube in which said end wall portions of the second grid are parts of an arcuate surface having its center of curvature at said point, and said end walls of the first control grids are tangent to an arc concentric with said arcuate surface of the second grid.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US735025A 1967-06-27 1968-06-06 Color tube having venetian blind-type color selection grid and integrally formed baffles on display screen Expired - Lifetime US3546517A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES110521A DE1286542B (de) 1967-06-27 1967-06-27 Farbfernseh-Bildroehre mit ebener Bildschirmelektrode

Publications (1)

Publication Number Publication Date
US3546517A true US3546517A (en) 1970-12-08

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Application Number Title Priority Date Filing Date
US735025A Expired - Lifetime US3546517A (en) 1967-06-27 1968-06-06 Color tube having venetian blind-type color selection grid and integrally formed baffles on display screen

Country Status (5)

Country Link
US (1) US3546517A (fr)
DE (1) DE1286542B (fr)
FR (1) FR1570267A (fr)
GB (1) GB1208618A (fr)
NL (1) NL6805095A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019085A (en) * 1973-05-02 1977-04-19 Mitsubishi Denki Kabushiki Kaisha Internal magnetic shield for cathode ray tube

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2606303A (en) * 1951-02-17 1952-08-05 Bramley Jenny Color television tube and process
US2646521A (en) * 1950-03-23 1953-07-21 Rca Corp Color television picture tube
US2650264A (en) * 1949-12-22 1953-08-25 Rca Corp Color television reproducing system
US2692532A (en) * 1951-04-04 1954-10-26 Chromatic Television Lab Inc Cathode ray focusing apparatus
US2831998A (en) * 1955-01-03 1958-04-22 Eugene W Allen Multicolor cathode ray tube and viewing screen and post deflection focusing unit therefor
US3041489A (en) * 1958-09-26 1962-06-26 Siemens Und Halske Ag Berlin A Single-beam color television picture tube

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2650264A (en) * 1949-12-22 1953-08-25 Rca Corp Color television reproducing system
US2646521A (en) * 1950-03-23 1953-07-21 Rca Corp Color television picture tube
US2606303A (en) * 1951-02-17 1952-08-05 Bramley Jenny Color television tube and process
US2692532A (en) * 1951-04-04 1954-10-26 Chromatic Television Lab Inc Cathode ray focusing apparatus
US2831998A (en) * 1955-01-03 1958-04-22 Eugene W Allen Multicolor cathode ray tube and viewing screen and post deflection focusing unit therefor
US3041489A (en) * 1958-09-26 1962-06-26 Siemens Und Halske Ag Berlin A Single-beam color television picture tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019085A (en) * 1973-05-02 1977-04-19 Mitsubishi Denki Kabushiki Kaisha Internal magnetic shield for cathode ray tube

Also Published As

Publication number Publication date
NL6805095A (fr) 1968-12-30
GB1208618A (en) 1970-10-14
DE1286542B (de) 1969-01-09
FR1570267A (fr) 1969-06-06

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