摘要:
A shadow mask of a color cathode-ray tube has a substantially rectangular mask main body and a substantially rectangular mask frame fixed to a skirt portion of the mask main body. The mask main body has a curved effective surface formed with a large number of electron-beam passage apertures and opposing the phosphor screen, a non-aperture portion surrounding the outer periphery of this effective surface, and a skirt portion formed in a bent on the outer periphery of the non-aperture portion. The mask main body has a long axis extending in a horizontal direction and crossing with a tube axis, and a short axis 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 short axis of the effective surface and the 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.
摘要:
In a color cathode ray tube in which the external surface of an effective portion of a panel has a flat surface or a slight curvature, the shadow mask is set such that the layout distance between electron beam through hole array near the long side of an effective surface of the shadow mask is larger in the vicinity of the short axis than the layout distance at the center of the effective surface. Further, the layout distance becomes gradually smaller in direction away from the short axis, and thereafter, the layout distance changes to an increase. In the vicinity of the short side of the effective surface, the layout distance becomes equal to or larger than the layout distance near the short axis. Therefore, the curvature of the shadow mask and the electron beam through hole array are set in proper condition, and mislanding of beam landing due to deformation or oscillation of the shadow mask can be reduced. At the same time, howling of the phosphor screen can be minimized.
摘要:
A color cathode ray tube having a reinforcing band, which constricts the outer periphery of a skirt portion of a vacuum envelope, arranged so as to fulfill a relation, b≧2.0a, where a is the distance between first and second planes along a tube axis, the first plane intersecting an end edge of the skirt portion and extending perpendicular to the tube axis, the second plane containing the central axis of stud pins supporting a shadow mask and extending perpendicular to the tube axis, and b is the distance between the first plane and a third plane along the tube axis, the third plane intersecting a side edge of the reinforcing band facing a vacuum envelope funnel.
摘要:
A color cathode ray tube is provided with a shadow mask having a mask body including a substantially rectangular effective surface in which a large number of electron beam passage apertures are formed. A plurality of reinforcing beads are formed on the effective surface, and project therefrom to have heights which varies in accordance with positions such that in at least a part of an area for provision of the reinforcing beads, the heights of the reinforcing beads satisfy the following relationship: dx1>dx2, dy1>dy2 where dx1 is the height measured at a first position which is apart from a longer axis of the effective surface and a distance x1 apart from a shorter axis thereof, dx2 is the height measured at a second position which is further apart from the longer axis than the first position and a distance x2 apart from the shorter axis, dy1 is the height measured at a third position which is located on the shorter axis and a distance y1 apart from the longer axis, dy2 is the height measured at a fourth position which is a distance apart from the shorter axis and a distance y2 apart from the longer axis, and the distances x1, x2, y1 and y2 satisfy the following relationship: x1=x2=y1=y2.
摘要:
A shadow mask of a color cathode-ray tube includes a substantially rectangular mask main body and a rectangular mask frame attached an outer periphery of the mask main body. The mask main body has a substantially rectangular main surface portion formed of a curved face having a large number of electron beam passage apertures, the main surface portion having a longer axis and a shorter axis perpendicular to the longer axis, and a skirt portion raised in peripheral edges of the main surface portion. The skirt portion has a pair of longer side walls extending substantially in parallel to the longer axis, and a pair of shorter side walls extending substantially in parallel to the shorter axis. Each of the longer side walls includes a pressing portion located near the shorter axis so as to protrude toward the mask frame and pressing the mask frame.
摘要:
In a color cathode ray tube comprising a panel with a substantially rectangular effective portion whose outside face is almost flat or slightly curved and whose inside face has a curvature in the direction of minor axis near the short sides of the portion, and a fluorescent substance screen having a substantially rectangular effective region formed on the inside face of the effective portion of the panel, the short sides in the outer circumference of the effective region of the fluorescent substance screen are projected toward the center of the effective region. This improves the flatness of images appearing on the fluorescent substance screen provided on the inside face of the effective portion in the color cathode ray tube with the outside face of the effective portion of the substantially rectangular panel being almost flat and the inside face having a curvature in the direction of minor axis at least near the short sides.
摘要:
A face panel (12) constituting a part of a vacuum envelope (20) has a substantially rectangular effective area (10), the inner surface of which is formed with a phosphor screen (14). The effective area has a long axis (X) extending in the horizontal direction and a short axis (Y) extending in the vertical direction. The outer surface of the effective area is cylindrically curved with an infinitely large radius of curvature along the long axis and a predetermined radius of curvature along the short axis. The vacuum envelope has arranged therein a shadow mask (15) in opposed relation to the phosphor screen. A mask body of the shadow mask has a substantially rectangular effective surface cylindrically curved with an infinitely large radius of curvature along the long axis and a predetermined radius of curvature along the short axis thereof. In manufacturing the shadow mask, a flat mask is subjected to a plastic deformation into a cylindrical shape curved along the short axis and then subjected to an elastic deformation in such a manner that the radius of curvature thereof is larger than at the time of plastic deformation. The mask body thus formed by elastic deformation is fixed to a rectangular frame.
摘要:
A substantially rectangular shadow mask is arranged opposite to a phosphor screen formed on an inner surface of a panel. The shadow mask has a mask body and a mask frame to which a peripheral portion of the mask body is attached. The shadow mask has a rectangular form having a center through which a tube axis passes, and a long axis and a short axis passing through the center and perpendicular to each other. The mask frame has a pair of long side walls extending parallel to the long axis and a pair of short side walls extending parallel to the short axis. The height of each long side wall at a central portion along the tube axis is lower than the height of each short side wall at a central portion along the tube axis.
摘要:
A shadow mask of a color cathode-ray tube includes a mask body in the form of a substantially rectangular curved surface. The mask body has a center, horizontal and vertical axes perpendicularly crossing each other at the center, long sides extending in parallel to the horizontal axis, and short sides extending in parallel to the vertical axis. In a region of the mask body which is adjacent to the vertical axis, the radius of curvature in the vertical direction is smaller at portions of the mask body which are near the long sides than at the central portion of the mask body. In a intermediate region of the mask body between the vertical axis and each short side, the radius of curvature in the vertical direction is larger at the portions of the mask body which are near the long sides than at a portion adjacent to the horizontal axis.
摘要:
A main body 34 of a shadow mask is opposed to a phosphor screen and is formed in a substantially rectangular shape. The main body 34 has a main surface portion 31 where a number of electron beam apertures are formed, and a skirt portion 33 provided around the main surface portion with a non-aperture portion 32 interposed between the skirt portion and the main surface portion. A plurality of rectangular openings 38a extending in the long axis direction (or X-direction) of the mask body are formed at the skirt portion. Concave portions 47 extending in the long axis direction (X-direction) of the mask body are formed at the non-aperture portion. The openings and concave portions are provided within a range of about ¼ of the length W of the mask body in the long axis direction, with respect to a center of the range defined at a position distant from the short axis Y by about ⅓ of the length W of the long axis direction of the mask body.