Funnel for use in a cathode ray tube
A funnel for use in a cathode ray tube having a panel and a neck includes a body portion connected to the panel; and a substantially rectangle shaped yoke portion extending from a rear end of the body portion, and being connected to the neck at a rear end thereof. The yoke portion has a circular section portion whose cross section is substantially circular. And the circular section portion is formed at a position where the yoke portion is cut for a salvage process of the funnel.
1 . A funnel for use in a cathode ray tube having a panel and a neck, comprising:
a body portion connected to the panel; and
a substantially rectangle shaped yoke portion extending from a rear end of the body portion, and being connected to the neck at a rear end thereof,
wherein the yoke portion includes a circular section portion whose cross section is substantially circular, and the circular section portion is formed at a position where the yoke portion is cut for a salvage process of the funnel.
2 . The funnel of claim 1 , wherein the circular section portion is formed in an entire part of the yoke portion ranging from a starting position spaced from the rear end of the yoke portion by about 3 mm to an ending position spaced apart the rear end of the yoke portion by about 10 mm, or formed in at least one portion of the part.
3 . The funnel of claim 1 , wherein an outer contour of the circular section portion is formed in a straight line segment parallel to a tube axis of the cathode ray tube.
4 . The funnel of claim 1 , wherein an outer contour of the circular section portion is formed in a straight line segment, and a straight line parallel to the straight line segment slants outwards with respect to a tube axis of the cathode ray tube at a predetermined slope angle from the yoke portion to the body portion.
5 . The funnel of claim 4 , wherein the slope angle is less than or equal to about 10°.
6 . The funnel of claim 1 , wherein an outer contour of the circular section portion is formed in a curved line segment, and a straight line tangent to the outer contour at an end of the outer contour near the rear end of the yoke portion slants outwards with respect to a tube axis of the cathode ray tube at a predetermined slope angle from the yoke portion to the body portion.
7 . The funnel of claim 6 , wherein the slope angle is less than or equal to about 10°.
8 . The funnel of claim 1 , wherein a diameter R of the circular section portion satisfies a relationship of R≦R 1 (1+10%), where R 1 indicates a diameter of the neck.
9 . The funnel of claim 1 , wherein the circular section portion is formed in such a manner that a maximum deviation among radii of an outer periphery of the cross section in directions of a long axis, a short axis and a diagonal axis is less than or equal to about 0.5 mm.