Cathode ray tube with structure for preventing electron beam mis-landing caused by geomagnetism

A cathode ray tube, comprising:

• a color selection apparatus selecting electron beams emitted from an electron gun and allowing the selected electron beams to land on corresponding phosphors, said color selection apparatus comprising a frame including a pair of supporting members disposed at a predetermined distance from each other in parallel and a pair of elastic members secured on both ends of said supporting members to correspond to lateral sides of a mask;
• and
• a shield apparatus shielding from geomagnetism and being mounted on a perimeter of said frame of said color selection apparatus and extended toward a neck of said cathode ray tube, said shield apparatus being extended toward a phosphor screen over one of longitudinal and lateral sidewalls of said frame, said shield apparatus, comprising:
• a main shield member including a skirt disposed on the longitudinal sides of said frame;
• and
• a sub-shield member disposed on the lateral sides of said frame, said sub-shield member covering a space defined between said mask and said elastic members.

A cathode ray tube, comprising:

• a color selection apparatus selecting electron beams emitted from an electron gun and allowing the selected electron beams to land on corresponding phosphors, said color selection apparatus comprising a frame including a pair of supporting members disposed at a predetermined distance from each other in parallel and a pair of elastic members secured on both ends of said supporting members to correspond to lateral sides of a mask;
• and
• a shield apparatus shielding from geomagnetism and being mounted on a perimeter of said frame of said color selection apparatus and extended toward a neck of said cathode ray tube, said shield apparatus being extended toward a phosphor screen over one of longitudinal and lateral sidewalls of said frame, said shield apparatus, comprising:
• a main shield member including a skirt disposed on longitudinal sides of said frame, said skirt being secured to said supporting members, covering a central portion of said supporting member and being asymmetrical with reference to the central portion of said supporting member;
• a sub-shield member disposed on lateral sides of said frame, said sub-shield member covering a space defined between said mask and said elastic members, a width of said sub-shielding member being greater than a width of the lateral sides of said frame;
• and
• a disconnection part defined by said skirt and said sub-shield member being disconnected from each other at the corners of said frame.