Cathode-ray tube apparatus

Details Cathode-ray tube apparatus Cathode-ray tube apparatus

2008-04-08

2008-04-08

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Envelope

C313S440000, C313S421000, C220S00210A

Reexamination Certificate

active

07355331

ABSTRACT:
In a cross-section including a tube axis, assuming that T1represents 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 T2represents 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: T2/T1≧1.18. Owing to this, cone halation can be prevented while an X-ray leakage amount is limited to a predetermined value or less.

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