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A getter which can maintain an absorption ability and secure sufficient characteristics even when a high-temperature low-vacuum is experienced in a process as compared with a conventional getter. The getter has an undulation on the surface, and is formed by depositing Ti or a composition mainly cont

A getter which can maintain an absorption ability and secure sufficient characteristics even when a high-temperature low-vacuum is experienced in a process as compared with a conventional getter. The getter has an undulation on the surface, and is formed by depositing Ti or a composition mainly containing Ti or Zr or a base surface mainly containing Zr.

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A getter which can maintain an absorption ability and secure sufficient characteristics even when a high-temperature low-vacuum is experienced in a process as compared with a conventional getter. The getter has an undulation on the surface, and is formed by depositing Ti or a composition mainly cont

A getter which can maintain an absorption ability and secure sufficient characteristics even when a high-temperature low-vacuum is experienced in a process as compared with a conventional getter. The getter has an undulation on the surface, and is formed by depositing Ti or a composition mainly containing Ti or Zr or a base surface mainly containing Zr. is a difference between the thickness am the center of the inner surface of the panel and a thickness at an end portion of the effective area of a long side portion of the panel, and Zmin is a difference between the thickness at the center of the inner surface of the panel and a thickness at the end portion of an effective area of the short side portion. 3. The flat type cathode ray tube according to claim 2, wherein a range of a distance of a skirt portion of the panel in a direction of the short axis is given by the following equation: 0.65<(PA)/(OAH)<0.7 where PA is the shortest distance between an extended plane passing the center of the inner surface of the panel and a center of a stud pin and OHA is a thickness of the skirt portion of the panel in the direction of the short axis. 4. A flat type cathode ray tube, comprising: a panel having a phosphor screen deposited on an inner surface of the panel, wherein an outer surface of the panel is substantially planar and the inner surface has a predetermined curvature; a funnel attached to a rear end portion of the panel; an electron gun arranged in a neck of the funnel for emitting electron beams; and a shadow mask installed on the inner surface of the panel at a predetermined distance therefrom and having a number of apertures for passing therethrough the electron beams, wherein the panel has a rectangular shape having a predetermined aspect ratio, and a curvature of the inner surface of the panel is given by the following equations: 0.5<(Zmaj-Zcen)/(Zcor-Zcen)<0.7 0.35<(Zmin-Zcen)/(Zcor-Zcen)<0.45 where, Zcen is a thickness at a center of the inner surface of the panel. Zmaj is a difference between the thickness at the center of the inner surface of the panel and a thickness at an end portion of the effective area of a long side portion of the panel, Zmin is a difference between a thickness at the center of the inner surface of the panel and a thickness at an end portion of an effective area of a short side portion of the panel, and Zcor is a difference between the thickness at the center of the inner surface of the panel and a thickness at an end portion of an effective area of a diagonal portion of the panel. 5. The flat type cathode ray tube of claim 4, wherein the aspect ratio of the panel is 16:9. 6. An improved panel for a flat type cathode ray rube, the panel having a phosphor screen deposited on an inner surface of the panel, wherein an outer surface of the panel is substantially planar and the inner surface has a predetermined curvature, the improvement comprising: a range of a curvature of the inner surface of the panel is given by the following equations: 0.51<(Zmin-Zcen)-(Zcor-Zmaj)<0.6, 0.51<(Zmaj-Zcen)-(Zcor-Zmin)<0.6. where, Zcen is a thickness at a center of the inner surface of the panel, Zmaj is a difference between the thickness at the center of the inner surface of the panel and a thickness at an end portion of the effective area of a long side portion of the panel, Zmin is a difference between the thickness at the center of the inner surface of the panel and a thickness at an end portion of an effective area of a short side portion of the panel, and Zcor is a difference between the thickness at the center of the inner surface of the panel and a thickness at the end portion of an effective area of a diagonal portion of the panel. 7. An improved panel for a flat type cathode ray tube, the panel having a phosphor screen deposited on an inner surface of the panel, wherein an outer surface of the panel is substantially planar and the inner surface has a predetermined curvature, the improvement comprising: a range of a curvature of the inner surface of the panel is given by the following equations: 0.2<(Zmajp-Zcen)/(Zmaj-Zcen)<0.3 0.2<(Zminp-Zcen)/(Zmin-Zcen)<0.3 where, Zmajp is a difference between a thickness at a half-way position between an end portion of an effective area of a long side portion of the panel and its center and a thick