Patent ID: 6528936
Filing Date: 2003-03-04
Classification: H01J

Abstract:
A cathode ray tube having a central axis Z, the cathode ray tube comprising:a panel with an inner phosphor screen and a rear portion, the panel having a substantially rectangular effective screen portion with two long sides in a horizontal axis direction, two short sides in a vertical axis direction and four edges in a diagonal axis direction; a funnel connected to the rear portion of the panel, the funnel sequentially having a body with a large-sized end and a small-sized end, and a cone portion with a large-sized end and a small-sized end, the large-sized end of the body being sealed to the rear portion of the panel, the small-sized end of the body meeting the large-sized end of the cone portion at a point, the meeting point of the body and the cone portion being an inflection point of the funnel, the cone portion having a thickness Th(z) in the horizontal axis direction, a thickness Tv(z) in the vertical axis direction and a thickness Td(z) in the diagonal axis direction; a neck sealed to the small-sized end of the cone portion; an electron gun fitted within the neck to produce electron beams; and a deflection yoke mounted around the cone portion of the funnel; wherein the horizontal thickness Th, the vertical thickness Tv and the diagonal thickness Td of the cone portion of the funnel in the tube axis Z direction over a substantial distance satisfy the following condition corresponding to practical routes of the electron beams in the diagonal axis direction: Th(z)â‰¡Tv(z)>Td(z).