Aperture grill for use in cathode ray tube and method for producing same

Abstract

A lightweight cathode ray tube is formed by reducing a cross-sectional area on the apeture grill tapes in the aperture grill. One exemplary embodiment of the reduced cross-sectional area aperture grill tape includes a central longitudinal channel in a side of the aperture grill tape that faces away from the screen. The reduction in cross-sectional area reduces a linear density of the tape thereby decreasing the tension required by the frame. As each of the aperture grill tapes includes this central longitudinal channel, the weight of the overall aperture grill is significantly reduced and the aperture grill frame weight is reduced due to the lower aperture grill tension. A method for producing the reduced cross-sectional area aperture grill tape is possible without significantly increasing the cost of manufacturing the aperture grill tape. One exemplary embodiment of this method includes a two-step etching process, in which one of the etching steps involves etching both sides of the aperture grill, during which step a central longitudinal channel is etched in each of the aperture grill tapes and the other etching step involves etching the screen side of the aperture grill only.

Dependencies are inferred from the claim text.