Cathode-ray tube, cathode-ray tube apparatus, image display apparatus, and coil unit

A cathode-ray tube apparatus comprising a cathode-ray tube and a deflection yoke,

• the cathode-ray tube including:
• a glass bulb including a face panel, a funnel, and a neck;
• a color-selection electrode which is disposed inside the face panel;
• and
• a loop coil which is disposed around the glass bulb between the color-selection electrode and the deflection yoke, a predetermined level of direct current being fed through the loop coil, wherein
• the loop coil includes a first portion and a second portion, the first portion including two extending portions of the loop coil positioned over and below the glass bulb respectively, each center of the two extending portions being substantially in a plane perpendicular to a tube axial of the glass bulb, and the second portion including two bent portions that are formed by bending a right side and a left side of an original form of the loop coil toward the neck respectively.

An image display apparatus that comprises a cathode-ray tube apparatus that includes a cathode-ray tube and a deflection yoke, and displays an image on the cathode-ray tube apparatus in accordance with an image signal, wherein

• the cathode-ray tube including:
• a glass bulb including a face panel, a funnel, and a neck;
• a color-selection electrode which is disposed inside the face panel;
• and
• a loop coil which is disposed around the glass bulb between the color-selection electrode and the deflection yoke, a predetermined level of direct current being fed through the loop coil, wherein
• the loop coil includes a first portion and a second portion, the first portion including two extending portions of the loop coil positioned over and below the glass bulb respectively, each center of the two extending portions being substantially in a plane perpendicular to a tube axial of the glass bulb, and the second portion including two bent portions that are formed by bending a right side and a left side of an original form of the loop coil toward the neck respectively.

A coil unit that is attached to a glass bulb of a cathode-ray tube, comprising:

• a pair of degaussing coils which are wound around an upper portion and a lower portion of the glass bulb with a tube axial of the glass bulb in between;
• and
• a loop coil which is disposed around the glass bulb between a color-selection electrode and a position at which a deflection yoke is to be attached, and includes a first portion and a second portion, the first portion including two extending portions of the loop coil positioned over and below the glass bulb respectively, each center of the two extending portions being substantially in a plane perpendicular to a tube axial of the glass bulb, and the second portion including two bent portions that are formed by bending a right side and a left side of an original form of the loop coil toward the neck respectively, wherein
• the loop coil is fixed to the degaussing coils at intersections of the loop coil and the degaussing coils before the loop coil is attached to the glass bulb.