Cathode ray tube
AssigneeLG. Philips Displays Korea Co., Ltd.
InventorSung Kim
Life of this patent
Estimating the term…
Abstract
A cathode ray tube including a frame, wherein the frame includes a side wall, to which the shadow mask is welded, and a bottom wall extending from the side wall in a state of being bent inwardly of the frame, and the frame has a side wall height and a bottom wall width defined in a cross section of the frame taken along the longer axis (x), to satisfy a condition “1.29≦FW_x/FH_x≦1.90” where “FW_x” represents the side wall height in the cross section of the frame taken along the longer axis (x), and “FH_x” represents the bottom wall width in the cross section of the frame taken along the longer axis (x). In accordance with this frame structure, it is possible to increase the intrinsic frequency of the frame, and thus, to prevent a degradation in color purity caused by a howling phenomenon.
Claims25
A cathode ray tube comprising a panel, a funnel coupled to a rear end of the panel, a shadow mask formed with a plurality of slots to perform a color selecting function for electron beams, and a frame adapted to support the shadow mask, wherein:
- the frame comprises a side wall, to which the shadow mask is welded, and a bottom wall extending from the side wall in a state of being bent inwardly of the frame;
- and
- the side wall of the frame has a height defined in a cross section of the frame taken along a longer axis (x) of the frame to satisfy the following condition, and the bottom wall of the frame has a width defined in the cross section of the frame taken along the longer axis (x) of the frame to satisfy the following condition:
- 1.29≦FW—x/FH—x≦1.90
- where, “FW_x” represents the height of the side wall in the cross section of the frame taken along the longer axis (x) of the frame, and “FH_x” represents the width of the bottom wall in the cross section of the frame taken along the longer axis (x) of the frame.
A cathode ray tube comprising a panel, a funnel coupled to a rear end of the panel, a shadow mask formed with a plurality of slots to perform a color selecting function for electron beams, and a frame adapted to support the shadow mask, wherein:
- the frame comprises a side wall, to which the shadow mask is welded, and a bottom wall extending from the side wall in a state of being bent inwardly of the frame;
- and
- the side wall of the frame has a height defined in a cross section of the frame taken along a short axis (y) of the frame to satisfy the following condition, and the bottom wall of the frame has a width defined in the cross section of the frame taken along the shorter axis (y) of the frame to satisfy the following condition:
- 0.70≦FW—y/FH—y≦1.10
- where, “FW_y” represents the height of the side wall in the cross section of the frame taken along the shorter axis (y) of the frame, and “FH_y” represents the width of the bottom wall in the cross section of the frame taken along the shorter axis (y) of the frame.
A cathode ray tube comprising a panel, a funnel coupled to a rear end of the panel, a shadow mask formed with a plurality of slots to perform a color selecting function for electron beams, and a frame adapted to support the shadow mask, wherein:
- the frame comprises a side wall, to which the shadow mask is welded, and a bottom wall extending from the side wall in a state of being bent inwardly of the frame;
- and
- the side wall of the frame has a height defined in a cross section of the frame taken along a diagonal axis (d) of the frame to satisfy the following condition, and the bottom wall of the frame has a width defined in the cross section of the frame taken along the diagonal axis (d) of the frame to satisfy the following condition:
- 1.49≦FW—d/FH—d≦1.91
- where, “FW_d” represents the height of the side wall in the cross section of the frame taken along the diagonal axis (d) of the frame, and “FH_d” represents the width of the bottom wall in the cross section of the frame taken along the diagonal axis (d) of the frame.
Dependencies are inferred from the claim text.