Electrode of electron gun for cathode ray tube

Abstract

An in-line gun for a cathode ray tube includes three beam-passing holes formed in an electrode and at least two reference holes formed in the electrode. The three beam-passing holes are aligned in line. The two reference holes are positioned opposite to each other with respect to a middle beam-passing hole in the three beams-passing holes. The two reference holes are of different shapes. One of the two reference holes is a round hole and the other is an elongated hole. The elongated hole is formed by elongating a hole having a center located at a position opposite to that of the round hole toward the middle beam-passing hole. The elongated hole may be defined by combining a small-diameter hole, a large-diameter hole, and two lines tangent to the small-diameter hole and the large-diameter hole. The large-diameter hole is closer to the middle beam-passing hole than the small-diameter hole.

Dependencies are inferred from the claim text.