| 摘要 |
PURPOSE:To improve the moldability while to reduce the springback and to mold into desired shape by making plural notches in the circumference of the skirt section of a shadowmask made of thin amber board. CONSTITUTION:A skirt section 3 is provided around the effective area section 2 formed with many holes of a shadowmask prior to pressing. The skirt section 3 is folded approximately in perpendicular against said section 2 through pressing to form a tubular skirt and a linear or a band-type half-etching section 4 for facilitating the folding is formed between said section 2. Many notches 5 are made in the entire circumference of the skirt section 3. The notches 5 will make the circumference of the skirt section discontinuous thus to prevent formation of rumples or overlapping at the skirt section 3 when pressing the shadowmask 1. Preferably, the ratio between the width A of the skirt section 3 and the depth B of the notch 5 is 40-90%. |
