Method for making CRT shadow masks
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorEiji Kamohara
Life of this patent
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Abstract
A method of making a mask structure including two or more masks for a color cathode ray tube, for example a mask-focusing color cathode ray tube, and the mask structure formed by the method. A plurality of apertured flat masks, each mask having an effective portion having apertures and non-effective portion surrounding the effective portion, are aligned and stacked with a predetermined gap. The gap is then filled with filling material, which solidifies thereby fixing the flat masks together. The fixed masks are simultaneously pressed into a predetermined curved shape. The filling material is then removed from the curved masks.
Claims8
A method of making a mask structure for a cathode ray tube comprising the steps of:
- preparing a first flat mask including an effective portion having a plurality of apertures therein and a non-effective portion surrounding said effective portion;
- disposing a first spacer structure on said non-effective portion of said first mask and a second spacer structure on said effective portion of said first flat mask;
- arranging a second flat mask on said first and second spacer structures, thereby forming a predetermined gap between said first and second flat masks, said second flat mask including an effective portion having a plurality of apertures therein and a non-effective portion surrounding said effective portion;
- filling said apertures of said first and second flat masks and said gap with a filling material having a viscosity so as to be pourable;
- solidifying said filling material, thereby fixing said flat masks together;
- simultaneously pressing said fixed flat masks into a predetermined curvature;
- and
- removing said second spacer structure from said curved masks.
A method of making a mask structure for a cathode ray tube comprising the steps of:
- attracting a first flat mask to a first electromagnet, said first flat mask including an effective portion having a plurality of apertures and a non-effective portion surrounding said effective portion;
- attracting a second flat mask to a second electromagnet, said second flat mask including an effective portion having a plurality of apertures and an non-effective portion surrounding said effective portion;
- arranging said first and second flat masks attracted to said first and second electromagnet in parallel spaced apart relation with corresponding apertures aligned;
- filling said apertures of said first and second flat masks and a space formed between said flat masks with filling material having a viscosity so as to be pourable;
- solidifying said filling material, thereby fixing said flat masks together;
- deactivating said first and second electromagnets;
- removing said first and second electromagnets from said fixed flat masks;
- simultaneously pressing said fixed flat masks into a predetermined curvature;
- and
- removing said filling material from said curved masks.
Dependencies are inferred from the claim text.