| 摘要 |
In a cross-section including a tube axis, assuming that T 1 represents a thickness of a funnel at a point on an outer circumferential surface of the funnel, which is placed at the same position in a tube axis direction as that of an end of a horizontal deflection coil on a phosphor screen side, and T 2 represents a thickness of the funnel at a point on the outer circumferential surface of the funnel, which is placed at the same position in the tube axis direction as a position 7 mm away from the end of the horizontal deflection coil on the phosphor screen side to the phosphor screen side along the tube axis, the funnel includes at least one cross-section including the tube axis satisfying a relationship: T 2 /T 1 >=1.18. Owing to this, cone halation can be prevented while an X-ray leakage amount is limited to a predetermined value or less.
|
