EP0223670A1 - Schattenmaskenfarbfernsehröhre und Verfahren zu deren Herstellung - Google Patents

Schattenmaskenfarbfernsehröhre und Verfahren zu deren Herstellung Download PDF

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Publication number
EP0223670A1
EP0223670A1 EP86402326A EP86402326A EP0223670A1 EP 0223670 A1 EP0223670 A1 EP 0223670A1 EP 86402326 A EP86402326 A EP 86402326A EP 86402326 A EP86402326 A EP 86402326A EP 0223670 A1 EP0223670 A1 EP 0223670A1
Authority
EP
European Patent Office
Prior art keywords
mask
screen
tube
openings
vertical
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.)
Granted
Application number
EP86402326A
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English (en)
French (fr)
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EP0223670B1 (de
Inventor
Pierluigi Testa
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.)
Videocolor SA
Original Assignee
Videocolor SA
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 Videocolor SA filed Critical Videocolor SA
Publication of EP0223670A1 publication Critical patent/EP0223670A1/de
Application granted granted Critical
Publication of EP0223670B1 publication Critical patent/EP0223670B1/de
Expired legal-status Critical Current

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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

  • the invention relates to a mask type color television tube and its manufacturing process. It relates more particularly to a color television tube in which the three electron guns are in line, that is to say whose axes are in the same plane.
  • a color television tube has a front panel on the internal face of which the screen is deposited, which is usually formed by vertical bands of cathodoluminescent materials (phosphors) emitting, when they are excited by an electron beam produced by a electron gun, red, green or blue light.
  • the screen thus comprises a succession of sets of three vertical bands, each set having a red band, a green band and a blue band. Each color is excited by a corresponding electron beam.
  • a matrix two neighboring bands of phosphor are separated by a black band of graphite, which makes it possible to obtain an image of improved contrast.
  • a mask tube for the selection of colors, that is to say so that the beam intended for a color, for example blue, strikes only the phosphor which is to produce this color (blue), provision is made before l 'screen a shadow mask whose position and arrangement of the openings, generally slits elongated in the vertical direction, ensure said selection of colors.
  • the mask Since the position of the mask relative to the screen must be determined with precision, the mask is used to make the screen and, for this purpose, it is fixed to the slab of the tube before the formation of the screen .
  • Each of the luminescent substances is then deposited in the following manner: the inner face of the panel is covered with a solution of this substance in a photosensitive material which hardens when it is illuminated by ultraviolet (UV) radiation, then illuminate this solution with a optical system which includes a source of UV radiation and a lens simulating the deflector of the tube.
  • the position of the optical system, in particular of the UV lamp depends on the color of the phosphor in solution. In this way only the photosensitive material located at the locations provided for the determined color is illuminated and can therefore harden. The material in the other locations does not harden or settle on the glass; it can be cleaned by washing with water or using another liquid.
  • the mask being formed of slots arranged in succession according to vertical lines it is necessary, to form on the screen of the continuous vertical lines, to move the UV source in vertical direction during the illumination.
  • a cylindrical lens is usually provided in the optical system for projecting UV light. But such a cylindrical lens is an expensive element and which, in addition, is not entirely satisfactory.
  • the invention remedies this defect in a simple and economical manner.
  • the slots of the mask have a position and a shape such that their images on the screen are, over the entire surface of the latter, arranged in vertical lines with a constant width.
  • the mask of the tube according to the invention does not have, over its entire surface, slits whose major axes are vertical lines; but certain slots, in particular those which are in the vicinity of the corners, have major axes inclined with respect to the vertical; moreover, the edges of the slits near the center are straight while the edges of the slits near the corners are curved.
  • the inclination and the shape of the slits To determine the inclination and the shape of the slits, one can proceed experimentally by carrying out tests or even using a calculation program determining the path of the light rays which, starting from the optical system, form on the screen. regular vertical images of constant width; the shape, position and dimensions of each slit are then determined by the intersection of a light beam with the surface that constitutes the mask.
  • the mask 10 ( Figure 1) of a color television tube (not shown in its entirety) known so far, includes elongated slots 11 arranged in rows along lines 12 which, during the usual use of the television receiver, constitute vertical lines. The major axes of the slots of the same row are merged with the corresponding line 12. These slots of the known mask also all have the same width with rectilinear vertical edges.
  • the mask 10 is fixed to this panel 13, the face of which internal is previously covered with photosensitive material curable with ultraviolet radiation and containing one of the phosphors.
  • This assembly is then associated with an optical system 14 comprising an ultra-violet source 15 and a projection device 16 simulating the deflector of the tube which will ultimately be manufactured, so that the UV light rays have the direction of the electron brushes which will be produced by the barrel associated with the color of the phosphor in solution on the screen.
  • the images 17, on the screen 13, of the slots 11 of the mask are not exact replicas of these slots: in particular the images 17c in the vicinity of the corners 18 have a large axis inclined by an angle ⁇ with respect to to the corresponding vertical line 12 ′ and, in addition, their edges are slightly curved.
  • the magnitude of this defect decreases when approaching the median horizontal axis 19 of the screen and the center 20 of the latter. It should also be noted that this defect decreases when the radius of curvature of the screen increases, that is to say that the defect is less pronounced for a flat screen.
  • the source 15 is moved parallel to the lines 12. But due to the variable inclination of the images of the slots 11 on the screen, despite this displacement of the source 15, the lines obtained on the screen do not have a constant thickness: they are thicker near the corners than in the center.
  • the slots 11 of the mask 10 have an orientation and a shape such that they project onto the screen 13 so as to form regular alignments of vertical axes and of constant thickness over the entire surface of the screen.
  • the slots 11 do not all have the same orientation.
  • the slot 11c which is located near a corner 25 is inclined, relative to the vertical line 12, by an angle ⁇ ′ in the opposite direction to the angle ⁇ ( Figure 1).
  • the central slot 11a, on the median horizontal line 26, has a major axis along the line 12.
  • the slot 11d close to the lower right corner 27 has a major axis, the inclination relative to the line 12 is practically equal in absolute value to the angle ⁇ ′ but in the opposite direction, the line 26 constituting an axis of symmetry for the mask.
  • the longitudinal edges 28 and 29 of the slot 11a are straight.
  • the corresponding edges of the slots 11c and 11d have a slight convex curvature.
  • the mask 10 has a vertical axis of symmetry 31 passing through the center 30.
  • the source is formed by a limited number of points and we determines, for each of these points and for each ray direction emitted by them, the direction of the ray leaving the system 14. This calculation is performed, for each azimuth value in site increments, the value of the increment being chosen as a function of the desired precision, the various azimuth values are also separated by an incremental value chosen as a function of the desired precision.
  • the constancy of the thickness of the lines of phosphor or graphite on the screen 13 is obtained without complicating the production of the optical system 14.
  • the optical system 14 is simplified compared to the previous embodiments where it was planned a cylindrical lens whereas with the invention one can do without such a lens.
  • the invention is particularly applicable to a color television tube in which the three electron guns are in line, that is to say whose axes are in the same plane.

Landscapes

  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
EP86402326A 1985-10-22 1986-10-16 Schattenmaskenfarbfernsehröhre und Verfahren zu deren Herstellung Expired EP0223670B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8515666A FR2589002B1 (fr) 1985-10-22 1985-10-22 Tube de television en couleurs du type a masque et son procede de fabrication
FR8515666 1985-10-22

Publications (2)

Publication Number Publication Date
EP0223670A1 true EP0223670A1 (de) 1987-05-27
EP0223670B1 EP0223670B1 (de) 1989-12-13

Family

ID=9324090

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86402326A Expired EP0223670B1 (de) 1985-10-22 1986-10-16 Schattenmaskenfarbfernsehröhre und Verfahren zu deren Herstellung

Country Status (7)

Country Link
US (1) US4775819A (de)
EP (1) EP0223670B1 (de)
JP (1) JP2527426B2 (de)
DE (1) DE3667571D1 (de)
FR (1) FR2589002B1 (de)
HK (1) HK2395A (de)
SG (1) SG90692G (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2226695A (en) * 1988-11-26 1990-07-04 Samsung Electronic Devices Shadow mask for colour cathode ray tube

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW297907B (de) * 1994-07-14 1997-02-11 Toshiba Co Ltd
CN111312570B (zh) * 2020-03-02 2021-04-30 电子科技大学 一种确定电子枪阴极与热丝装配间距的仿真方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2450734A1 (de) * 1974-10-25 1976-04-29 Licentia Gmbh Farbbildkathodenstrahlroehre

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6024533B2 (ja) * 1973-12-10 1985-06-13 日本電気株式会社 シヤドウマスクの製造方法
JPS57132641A (en) * 1981-02-12 1982-08-17 Nec Corp Shadow mask
JPS5916249A (ja) * 1982-07-16 1984-01-27 Mitsubishi Electric Corp カラ−ブラウン管
JPS59165338A (ja) * 1983-03-10 1984-09-18 Toshiba Corp カラ−受像管
SU1461377A3 (ru) * 1984-05-25 1989-02-23 Рка Корпорейшн (Фирма) Цветной кинескоп

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2450734A1 (de) * 1974-10-25 1976-04-29 Licentia Gmbh Farbbildkathodenstrahlroehre

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
JOURNAL OF THE TELEVISION SOCIETY, vol. 8, no. 11, juillet/septembre 1958, pages 470-480, Chicago, Illinois, US; S.H.KAPLAN: "Error correction in mask type colour television tubes" *
PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 230, (E-142)[1108], 16 novembre 1982; & JP-A-57 132 641 (NIPPON DENKI K.K.) 17.08.1982 *
PATENTS ABSTRACTS OF JAPAN, vol. 8, no. 99 (E-243)[1536], 10 mai 1984; & JP-A-59 16 249 (MITSUBISHI DENKI K.K.) 27.01.1984 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2226695A (en) * 1988-11-26 1990-07-04 Samsung Electronic Devices Shadow mask for colour cathode ray tube
GB2226695B (en) * 1988-11-26 1993-06-16 Samsung Electronic Devices Shadow mask for colour cathode ray tube

Also Published As

Publication number Publication date
SG90692G (en) 1993-02-19
JP2527426B2 (ja) 1996-08-21
HK2395A (en) 1995-01-13
FR2589002A1 (fr) 1987-04-24
DE3667571D1 (de) 1990-01-18
EP0223670B1 (de) 1989-12-13
US4775819A (en) 1988-10-04
JPS6298538A (ja) 1987-05-08
FR2589002B1 (fr) 1994-09-23

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