Cathode ray tube

摘要

When we let the aspect ratio of the fluorescent screen of a cathode ray tube be M:N and, in a coordinate system in which the origin is a point on the tube axis and the horizontal axis and vertical axis intersect at right angles, when we let LA be the horizontal radius of the outer surface of a cone component (4), SA be the vertical radius, and θ be the angle formed by a horizontal axis H and an axis D in the direction of the maximum diameter on the inner surface of the cone component (4), then when the position Z on the tube axis, using as its origin a reference line position that serves as a reference for a deflection angle, is within a range of -30 mm ≤ Z ≤ 10 mm, a portion is included such that the angle θ and the values of M, N, LA(Z), and SA(Z) satisfy the relational formula θ = tan-1[(N/M) × (LA(Z)/SA(Z))].