| 摘要 |
PURPOSE: A shadow mask for a color CRT is provided to improve moire property and purity property by increasing a vertical pitch between electron beam through holes from the center toward the end part of the short axis and from the center toward the end part of the diagonal axis. CONSTITUTION: A shadow mask for a color CRT comprises a panel having a phosphor screen, a funnel connected to the panel, an electron gun for radiating electron beams toward the phosphor screen, and a shadow mask for sorting color. The shadow mask includes a long axis and a short axis, an effective surface including a plurality of electron beam through holes, and an edge portion surrounding the effective surface. The vertical pitch of the electron beam through holes is more than 0.15mm and less than 0.35mm and increases from the center toward the short axis direction.
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