Cathode ray tube

A cathode ray tube comprising:

• an inner magnetic shield, a mask frame, a shadow mask, and a face plate, wherein
• the mask frame is made up of a) a pair of spanning members to which the shadow mask is attached in a state of tension, and b) a pair of holding members that are joined with the spanning members and maintain the shadow mask tension by being arranged in a position that Is parallel to a direction of tension,
• the inner magnetic shield a) is mounted onto the holding members, b) is a tube with a plurality of side surfaces, and c) is provided with one or more skirts that, at locations where the inner magnetic shield is not in contact with the holding members, extend to vicinities of the spanning members, and
• the one or more skirts are magnetically coupled with the spanning members.

A cathode ray tube comprising:

• an inner magnetic shield, a mask frame, a shadow mask, and a face plate, wherein
• the mask frame is made up of a) a pair of attachment members to which the shadow mask is attached, and b) a pair of positioning members that are joined with the attachment members to keep them in a predetermined position,
• the inner magnetic shield a) is mounted onto the positioning members, b) is a tube with a plurality of side surfaces, and c) is provided with one or more primary skirts and one or more secondary skirts, wherein
• at locations where the inner magnetic shield is not in contact with the positioning members, the one or more primary skirts extend to vicinities of the attachment members,
• the one or more secondary skirts extend over an outer surface of the mask frame to cover tie attachment members at areas where they are joined to the positioning members,
• a length of the one or more secondary skirts in a direction of a length of the attachment members is no smaller than 1 and no greater than 2 times that of the areas where the attachment members are joined to the positioning members, and
• the one or more primary skirts and the one or more secondary skirts are magnetically coupled with the attachment members.

A cathode ray tube comprising:

• an inner magnetic shield, a mask frame, a shadow mask, and a face plate, wherein
• the mask frame is made up of a) a pair or spanning members to which the shadow mask is attached in a state of tension, and b) a pair of holding members that are joined with the spanning members and maintain the shadow mask tension by being arranged in a position that is parallel to a direction of tension,
• the inner magnetic shield axis mounted onto the holding members, b) is a tube with a plurality of side surfaces, and c) is provided with one or more primary skirts and one or more secondary skirts, wherein
• at locations where the inner magnetic shield is not in contact with the holding members, the one or more primary skirts extend to vicinities of the spanning members,
• the one or more secondary skirts extend over an outer surface of the mask frame to cover the spanning members at areas where they are joined to the holding members,
• a length of the one or more secondary skirts in a direction of a length of the spanning members is no smaller than 1 and no greater than 2 times that of the areas where the spanning members are joined to the holding members, and
• the one or more primary skirts and the one or more secondary skirts are magnetically coupled with the spanning members.