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1. WO1990010946 - BLACKENING OF NI-BASED FTM SHADOW MASKS

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Publication Number WO/1990/010946
Publication Date 20.09.1990
International Application No. PCT/US1990/001134
International Filing Date 28.02.1990
Chapter 2 Demand Filed 23.08.1990
IPC
H01J 29/07 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
29Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/113
02Electrodes; Screens; Mounting, supporting, spacing, or insulating thereof
06Screens for shielding; Masks interposed in the electron stream
07Shadow masks for colour-television tubes
CPC
H01J 2229/0722
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
2229Details of cathode ray tubes or electron beam tubes
07Shadow masks
0722Frame
H01J 2229/0783
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
2229Details of cathode ray tubes or electron beam tubes
07Shadow masks
0727Aperture plate
0777Coatings
0783improving thermal radiation properties
H01J 29/07
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
29Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
02Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
06Screens for shielding; Masks interposed in the electron stream
07Shadow masks for colour television tubes
H01J 9/142
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
9Apparatus or processes specially adapted for the manufacture ; , installation, removal, maintenance; of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
02Manufacture of electrodes or electrode systems
14of non-emitting electrodes
142of shadow-masks for colour television tubes
Applicants
  • ZENITH ELECTRONICS CORPORATION [US]/[US]
Inventors
  • TONG, Hua-Sou
Agents
  • CHRYSTAL, John, J.
Priority Data
308,90413.03.1989US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) BLACKENING OF NI-BASED FTM SHADOW MASKS
(FR) NOIRCISSEMENT DE MASQUES PERFORES FTM A BASE DE NICKEL
Abstract
(EN) The power handling capacity of nickel-iron-based flat tensioned foil shadow masks for flat faceplate cathode ray tubes (CRTs) is enhanced by providing the flat tensioned mask (FTM) with a thin surface layer which is enriched in nickel, which is converted to a nickel phosphide compound. The nickel phosphide surface layer is formed on the mask by immersing the mask in a first bath of a strong reducing acid followed by immersing the mask in a second strong reducing acid having an effective amount of hypophosphite ion. The thin surface layer of a nickel phosphide compound increases the FTM emissivity and reduces FTM doming at high electron beam energies. The nickel phosphide compound may be stabilized in the frit-lehr cycle during CRT assembly or in a separate heating operation.
(FR) La capacité de réception de puissance de masques perforés sous forme de feuille plate tendue à base de nickel-fer pour tubes à rayon cathodique à plaque plate (CRTs) est améliorée en utilisant un masque à feuille tendue (FTM) avec une couche superficielle mince qui est enrichie en nickel, lequel est converti en un composé de phosphure de nickel. La couche superficielle en phosphure de nickel est formée sur le masque par immersion du masque dans un premier bain d'un acide réducteur fort suivi d'une immersion du masque dans un second bain d'acide réducteur fort ayant une quantité efficace d'ions hypophosphites. La couche superficielle mince en composés de phosphure de nickel augmente l'émissivité du FTM et réduit la formation de dôme du FTM à des énergies élevées de faisceaux d'électrons. Le composé de phosphure de nickel peut être stabilisé dans le cycle de frittage-recuisson pendant le montage du tube à rayon cathodique ou dans une opération thermique séparée.
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