Aperture grill having additional slits preventing deformation of end slits and capable of intercepting light rays

摘要

The present invention provides an aperture grill capable of securing uniformity in the width of end slits among slits formed in an effective area of the picture of the flat grill plate of an aperture grill for a CAT or the like. In an aperture grill formed by joining the periphery of a flat aperture grill of a thin metal sheet provided with a plurality of slits to a frame, extra slits having a width smaller than that of the plurality of slits and capable of screening are formed in the flat aperture grill at positions outside the end slits among the plurality of slits at the opposite ends of the effective area of picture.