| 摘要 |
A SHADOW MASK OF A COLOR CATHODE- RAY TUBE HAS A SUBSTANTIALLY RECTANGULAR MASK MAIN BODY (46) AND A SUBTSANTIALLY RECTANGULAR MASK FRAME FIXED TO A SKIRT PORTION OF THE MASK MAIN BODY. THE MASK MAIN BODY HAS A CURVED EFFECTIVE SURFACE (43) FORMED WITH A LARGE NUMBER OF ELECTRON-BEAM PASSAGE APERTURES (42) AND OPPOSING THE PHOSPHOR SCREEN, A NON-APERTURE PORTION (44) SURROUNDING THE OUTER PERIPHERY OF THIS EFFECTIVE SURFACE, AND A SKIRT PORTION (45) FORMED IN A BENT ON THE OUTER PERIPHERY OF THE NON-APERTURE PORTION. THE MASK MAIN BODY HAS A LONG AXIS (X) EXTENDING IN A HORIZONTAL DIRECTION AND CROSSING WITH A TUBE AXIS (Z), AND A SHORT AXIS (Y) EXTENDING IN A VERTICAL DIRECTION AND CROSSING WITH BOTH THE TUBE AXIS AND THE LONG AXIS. THE EFFECTIVE SURFACE AND THE NON-APERTURE PORTION OF THE MASK MAIN BODY ARE FORMED IN A CURVED SURFACE HAVING A RADIUS OF CURVATURE IN THE SHORT AXIS DIRECTION. AT EACH LONG SIDE OF THE MASK MAIN BODY, EACH END PORTION OF THE SHRT AXIS OF THE EFFECTIVE SURFACE AND NON-APERTURE PORTION IS RECESSED FROM ANY OTHER ADJACENT PART, IN A DIRECTION LEAVING FROM THE PHOSPHOR SCREEN ALONG THE TUBE AXIS. THE RADIUS OF CURVATURE IN A SHORT AXIS DIRECTION NEAR THE SHORT AXIS OF THE EFFECTIVE SURFACE AND THE NON-APERTURE PORTION OF THE MASK MAIN BODY IS SMALLER THAN THE RADIUS OF CURVATURE IN THE SHORT AXIS DIRECTION AT OTHER PARTS.(FIG. 2)
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