Deflection apparatus for cathode ray tube

A cathode ray tube comprising:

• a panel bearing a rectangular shape;
• a funnel connected to the panel and having an outer surface;
• a neck connected to the funnel;
• and
• a deflection apparatus mounted around the outer surface of the funnel to deflect electron beams, wherein the deflection apparatus includes
• a horizontal deflection coil;
• a vertical deflection coil placed external to the horizontal deflection coil;
• an insulating member interposed between the horizontal deflection coil and the vertical deflection coil;
• and
• a core placed on the insulating member and connected to the vertical deflection coil, wherein the horizontal deflection coil, the vertical deflection coil, the insulating member and the core are in a sectional structure proceeding perpendicular to a tube axis of the cathode ray tube, and the sectional structure is formed with a first arc corresponding to a horizontal axis X, a second arc corresponding to a vertical axis Y and a third arc corresponding to a diagonal axis between the horizontal and the vertical axes X and Y, the horizontal axis X and the vertical axis Y forming four quarter sides, and at least one of the first arc and the second arc is formed with a center located inside a quarter side adjacent to a quarter side in which the sectional structure formed by the at least one of the first and second arc is located.

A deflection apparatus for a cathode ray tube comprising:

• a horizontal deflection coil;
• a vertical deflection coil placed external to the horizontal deflection coil;
• an insulating member interposed between the horizontal deflection coil and the vertical deflection coil;
• and
• a core placed on the insulating member connected to the vertical deflection coil,
• wherein the horizontal deflection coil, the vertical deflection coil, the insulating member, and the core have at least one sectional structure having an inner surface, the sectional structure proceeding perpendicular to a tube axis of the cathode ray tube, the inner surface of the sectional structure being closer to the tube axis than an outer surface of the sectional structure,
• wherein with any one of the horizontal and the vertical deflection coils, the at least one sectional structure has a varying thickness in the plane defined by a horizontal axis X and a vertical axis Y, where the horizontal axis X, vertical axis Y, and tube axis all lie perpendicular to one another and form a three-dimensional space,
• wherein the thickness of the sectional structure along a first line perpendicular to a second line tangent to an arc defined by the inner surface of the sectional structure gradually increases away from a point of the sectional structure closest to at least one of the horizontal axis X and the vertical axis Y toward a point of the sectional structure corresponding to a diagonal axis between the horizontal axis X and the vertical axis Y, the increase in thickness being defined by an arc along the outer surface of the sectional structure, and wherein the thickness of the sectional structure gradually increases away from the points closest to both the horizontal axis X and the vertical axis Y toward a point of the sectional structure corresponding to a diagonal axis between the horizontal axis X and the vertical axis Y.