Color cathode ray tube having an improved internal magnetic shield

摘要

A color cathode ray tube includes a magnetic shield of generally truncated pyramidal shape housed in its funnel portion and an electron beam deflection device. The magnetic shield is configured such that a magnetic shield-core distance between an end of a magnetic core of the deflection device facing toward the phosphor screen and an end of the magnetic shield facing toward the electron gun is approximately constant for section plane angles theta in a range of 0° to 360°, the magnetic shield-core distance being measured in a section plane containing a longitudinal axis of the cathode ray tube and being inclined at the section plane angle theta with respect to a horizontal scanning direction of the electron beams.