Velocity modulation coil apparatus and cathode-ray tube...

Details Velocity modulation coil apparatus and cathode-ray tube... Velocity modulation coil apparatus and cathode-ray tube...

2006-10-31

2006-10-31

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

C335S213000, C335S299000

Reexamination Certificate

active

07129628

ABSTRACT:
A pair of velocity modulation coils are placed with a horizontal plane including a tube axis interposed therebetween, and a pair of magnetic substances are placed with a vertical plane including a tube axis interposed therebetween. A straight line portion of the velocity modulation coil extending substantially in parallel to the tube axis is placed between the magnetic substance and the tube axis. An interval D between the magnetic substance and the straight line portion is 1 to 3 mm. Assuming that the tube axis is a Z-axis, a size of the velocity modulation coil in a tube axis direction is L, and a position of an end of the velocity modulation coil on a side opposite to a phosphor screen in the tube axis direction is Z=0, a center point of the pair of magnetic substances in the tube axis direction is present in a range of Z=0.2×L to 0.9×L. Consequently, the sensitivity of velocity modulation can be enhanced while suppressing an increase in a driving power with a simple configuration.

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