WO2000072352A1 - Masque perfore destine a un tube forte luminance, recepteur d'images couleurs, et un tel tube - Google Patents

Masque perfore destine a un tube forte luminance, recepteur d'images couleurs, et un tel tube Download PDF

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Publication number
WO2000072352A1
WO2000072352A1 PCT/JP2000/003321 JP0003321W WO0072352A1 WO 2000072352 A1 WO2000072352 A1 WO 2000072352A1 JP 0003321 W JP0003321 W JP 0003321W WO 0072352 A1 WO0072352 A1 WO 0072352A1
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WO
WIPO (PCT)
Prior art keywords
shadow mask
area
hole
holes
dot
Prior art date
Application number
PCT/JP2000/003321
Other languages
English (en)
Japanese (ja)
Inventor
Tsuneyuki Ide
Takahiko Miyazaki
Susumu Shigemasa
Yasuo Tahara
Original Assignee
Toyo Kohan Co.,Ltd.
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 Toyo Kohan Co.,Ltd. filed Critical Toyo Kohan Co.,Ltd.
Priority to AU49483/00A priority Critical patent/AU4948300A/en
Publication of WO2000072352A1 publication Critical patent/WO2000072352A1/fr

Links

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

Definitions

  • the present invention relates to a shadow mask for a high-luminance color picture tube and a picture tube incorporating the same. More specifically, the present invention relates to a shadow mask for a color picture tube having a high brightness screen and a color picture tube incorporating the same.
  • Landscape technology
  • the shadow mask type color picture tube uses an in-line electron gun to irradiate an electron beam consisting of three beams corresponding to the three primary colors of red, green and blue signals.
  • an electron beam consisting of three beams corresponding to the three primary colors of red, green and blue signals.
  • it is sorted into three primary colors by the lens action and the aperture action, and the phosphors of the three primary colors coated on the inside of the entire glass selectively It stimulates and emits light.
  • the focus (sharpness of the contour) and resolution (fineness) of the image reproduced on the cathode ray tube depends on the size and shape of the electron beam spot that reaches the phosphor screen, as well as the dot hole pitch and hole shape of the shadow mask. It is said to be highly dependent. It is said that the brightness and contrast of the image are proportional to the area of the dot hole.
  • the shadow mask type color picture tube has a slot hole type as shown in FIG. 1, and an encounter hole has an oval shape as shown in FIG. Since the upper and lower slot holes are separated by a bridge, the dot hole area is smaller than that of the aperture grill type stripe holes, which is disadvantageous in terms of brightness and contrast. Therefore, disadvantages such as reflection of external light such as illumination on the screen Had.
  • a so-called curved (dome-type) cathode-ray tube in which a shadow mask having a slightly curved mask surface is welded to a frame, has been used as a shadow mask type color picture tube.
  • the shadow mask used in such a conventional method is shaped like a dome, press formability and shape freezing during pressing were important.
  • the bridge portion between the dot holes is narrow, the bridge portion sometimes breaks as a stress concentration point during the above-described press molding. In this case, not only the shape of the dot hole is deformed, but also the shadow mask is deformed, which hinders the aperture function of the electron beam.If the image quality is significantly reduced (the function as a shadow mask is not limited to zero) Had to be spoiled.
  • This curved surface CRT has the problem that the eyes are fatigued and dim due to reflections from external light such as illumination light. Therefore, flattening of the CRT has been desired.
  • the flat curved surface may not be achieved with the slightly curved mask surface used in the conventional cathode ray tube.
  • a shadow mask-type cathode-ray tube of a flat surface shadow mask type of a tension mask is being developed in which the shadow mask is welded to a frame in a state where a vertical tension is applied.
  • the shadow mask is welded to a frame in a state where a vertical tension is applied.
  • An object of the present invention is to provide a shadow mask excellent in brightness and contrast, and a color picture tube incorporating the same by expanding a dot hole area in response to the flat surface cathode ray tube to which the tension is applied as described above. Is to provide. Disclosure of the invention
  • the shadow mask for a high-brightness color picture tube according to claim 1 is a shadow mask for a color picture tube having a slot-hole type dot hole, wherein the projection area of the ridge portion between the vertically adjacent meeting holes is the projection area of the meeting hole, and It is characterized in that it is in the range of 23 to 0.01% when converted into the ratio of the partial projected area to the total area.
  • the color picture tube according to claim 2 wherein in the shadow mask for a color picture tube having a slot hole type dot hole, the projected area of the bridge portion between the vertically adjacent meeting holes is the projected area of the meeting hole and the projected area of the bridge portion. It is characterized by incorporating a shadow mask for a color picture tube in the range of 23 to 0.01% in terms of the ratio to the total area, i C.
  • FIG. 1 is a view of a conventional slot hole type shadow mask viewed from a large dot hole side (a) and a small dot hole (b).
  • Figure 2 shows a slot-hole type shadow.
  • FIGS. 3A and 3B are a diagram (a), a cross-sectional view (c), and a diagram (b), respectively, of an I ⁇ mask observed from a large dot hole side.
  • FIG. 3 is a view taken along the line I-I in FIG. Figure 4 shows the large dot holes (a), hole cross sections ((:)) and small dot holes shown in Table 1.
  • FIG. 5 is a diagram (a), a cross-sectional view (c), and a diagram (b) observed from the small dot hole side of the dot hole of sample No. 9 in Table 1 when viewed from the large dot hole side. .
  • the shadow mask of the present invention is welded to a frame in a state in which tension is applied in the vertical direction, and in a subsequent heat treatment step, a tension-type shadow mask that maintains the tension applied state and a color picture tube incorporating the same are provided. Applied.
  • the dot hole shape of the shadow mask has an oblong slot hole, It is intended to provide a technology for improving a shadow mask having excellent brightness and contrast of a reproduced image by expanding the area of a dot hole.
  • FIG. 1 is a schematic view of a conventional slot hole type shadow mask observed from a large dot hole side and a small dot hole side, as described above.
  • Dot holes is usually by an etching process according to ferric (F e C 1 3) chloride aqueous solution, but is drilled, start digging from both iodide Tsu bets inlet and small dots inlet, dot holes in the encounter holes Open.
  • FIG. 2 shows a schematic sectional view of FIG.
  • the dot holes are etched in a mortar shape and meet ( showing an opening at the n part.
  • the electron beam is irradiated from the small dot side.
  • the lens action and the aperture action cause red
  • the minimum opening is usually the meeting hole as described above, but the entrance of the small dot may be the minimum opening depending on the progress of etching. In any case, since the minimum aperture corresponds to the electron beam 11) "and performs the function of a lens and a diaphragm, the meeting hole will be described here as the minimum aperture.
  • the electron beam that reaches the shadow mask passes through the slot-type dot holes, and the amount of the passage is proportional to the area of the meeting area, which is the minimum opening.
  • the brightness and the contrast of the reproduced image are proportional to the amount of the electron beam reaching the phosphor, and ultimately depend on the area of the meeting portion. In other words, as the area of the meeting portion is larger, the amount of the electron beam passing through the meeting portion is increased, and the phosphor is stimulated more, so that a reproduced image excellent in brightness and contrast can be obtained.
  • slot-hole type shadow masks are usually used mainly as consumer televisions, and are also used in some computer displays ⁇ .
  • the high brightness shadow mask of the present invention includes all consumer television and computer displays using the slot-hole type shadow mask.
  • the column pitch is in the range of about 740 to 780 m, which is determined by the specifications of the CRT manufacturer.
  • the vertical pitch if is applied to various specifications depending on the size and purpose of the television, the range of about 500 to 700 m is used relatively frequently.
  • these standards regarding the row pitch and the vertical pitch target the vicinity of the center of the shadow mask where the electron beam is incident almost perpendicularly to the shadow mask. Since the incident angle of the electron beam increases, the row pitch and vertical pitch are designed to be large.
  • the present invention discusses the shape of the dot hole near the center of the shadow mask where the electron beam is incident almost perpendicularly.
  • FIG. 3 is a cross-sectional view taken along the line I-I in FIG. 2, and shows that the vertically adjacent meeting holes are interposed by broken lines and bridges surrounded by hatching.
  • the opening ratio (%) of the dot hole is the opening ratio of the meeting portion hole, and is represented by the following equation (1).
  • the projected area ratio (%) of the bridge portion is expressed by the following equation (2).
  • the shadow mask formed by dot hole perforation in the etching step is welded and attached to the frame without press molding, so that the bridge portion is deformed by excessive stress. There is no danger of shaping. To that extent, the degree of freedom in the design of the dot hole shape is obtained, and it is possible to improve the brightness and contrast of the reproduced image by expanding the area of the encounter hole.
  • Table 1 shows the projected area ratio of the ridge portion and the main dimensions of the main jl of the dot holes for nine types of slot hole type shadow masks.
  • the material used was an aluminum-killed steel sheet and cold-rolled to a thickness of 0.1 mm. After coating the resist on both sides of the steel plate, pre-bake treatment was performed, and etching was performed after exposure and development using various slot hole pattern negatives.
  • the etching solution used was a ferric chloride solution, and was adjusted to a solution temperature of 70 ° C. and a solution specific gravity of 1.498. After the etching, the resist was removed, washed with water, and dried by heating in an oven.
  • the dot size of the obtained shadow mask was measured using a reading microscope (manufactured by Union) and a laser microscope (manufactured by Olympus), and the projected area ratio of the bridge portion was first measured using an image analyzer (manufactured by NIRECO). After the dot hole aperture ratio was determined, it was determined by the above equation (2).
  • the shadow mask material of the present invention has an oblong slot hole, and is converted into a ratio of the projected area of the ridge portion between the vertically adjacent meeting holes to the total area of the meeting hole projected area and the ridge portion projected area. Since it is in the range of 23 to 0.01%, the reproduced image has excellent brightness and contrast.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

L'invention concerne un masque perforé, destiné à un tube récepteur d'images couleurs, présentant des très petits trous du type en forme de fentes, et caractérisé en ce que la surface projetée des parties de liaison se situant entre les trous verticalement adjacents représente, en termes de pourcentage de surface, entre 23 et 0,01 % de la somme de la surface projetée des trous et de la surface projetée desdites parties de liaison. L'invention concerne également un tube récepteur d'images couleurs auquel on a incorporé le masque ci-dessus. Ce masque perforé peut correspondre à un tube de Braun à face plate possédant un masque perforé maintenu sous tension, et il offre une brillance et un contraste excellents par suite de sa zone accrue de trous
PCT/JP2000/003321 1999-05-24 2000-05-24 Masque perfore destine a un tube forte luminance, recepteur d'images couleurs, et un tel tube WO2000072352A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU49483/00A AU4948300A (en) 1999-05-24 2000-05-24 Shadow mask for high luminance color image receiving tube and color image receiving tube

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11/143637 1999-05-24
JP14363799 1999-05-24

Publications (1)

Publication Number Publication Date
WO2000072352A1 true WO2000072352A1 (fr) 2000-11-30

Family

ID=15343409

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2000/003321 WO2000072352A1 (fr) 1999-05-24 2000-05-24 Masque perfore destine a un tube forte luminance, recepteur d'images couleurs, et un tel tube

Country Status (2)

Country Link
AU (1) AU4948300A (fr)
WO (1) WO2000072352A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07272637A (ja) * 1994-03-31 1995-10-20 Hitachi Ltd カラー陰極線管
JPH0822775A (ja) * 1994-07-06 1996-01-23 Nec Kansai Ltd カラー陰極線管
JPH09180645A (ja) * 1995-12-28 1997-07-11 Matsushita Electron Corp カラー陰極線管
DE19731945A1 (de) * 1996-07-24 1998-01-29 Nec Corp Lochmaske für Farb-Katodenstrahlröhre
EP0982755A2 (fr) * 1998-08-24 2000-03-01 Matsushita Electronics Corporation Masque d'ombre pour tube à rayons cathodiques couleur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07272637A (ja) * 1994-03-31 1995-10-20 Hitachi Ltd カラー陰極線管
JPH0822775A (ja) * 1994-07-06 1996-01-23 Nec Kansai Ltd カラー陰極線管
JPH09180645A (ja) * 1995-12-28 1997-07-11 Matsushita Electron Corp カラー陰極線管
DE19731945A1 (de) * 1996-07-24 1998-01-29 Nec Corp Lochmaske für Farb-Katodenstrahlröhre
EP0982755A2 (fr) * 1998-08-24 2000-03-01 Matsushita Electronics Corporation Masque d'ombre pour tube à rayons cathodiques couleur

Also Published As

Publication number Publication date
AU4948300A (en) 2000-12-12

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