Funnel for cathode ray tube
AssigneeNippon Electric Glass Co., Ltd.
InventorsKazunobu Kunitomo, Hajime Yoshino
Life of this patent
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Abstract
On an inner wall of a side wall portion of a funnel, a pair of protrusions are integrally formed as glass buildups at positions separated by a predetermined distance from an anode button toward a side of a neck tube. The pair of the protrusions are formed symmetrically on both sides of a virtual baseline extending to an seal edge surface and the neck tube through the center of the anode button. The virtual baseline is an intersection between a virtual plane including a tube axis and the inner wall, and passes through approximately the center of the seal edge surface in the lengthwise side.
Claims18
A funnel for a cathode ray tube comprising;
- a seal edge surface provided for sealing a panel;
- a side wall portion gradually decreasing in diameter in a direction from the seal edge surface to a neck tube side;
- an anode button sealed on an inner wall of the side wall portion to which a getter mounting body comprising a getter and a mounting member is attached;
- and
- at least a pair of protrusions formed for restricting the getter mounting body from turning around the anode button from both sides,
- wherein each of the protrusions continues to the inner wall of the side wall portion as forming slopes from the most protruded part thereof toward the seal edge surface side and the neck tube side, and an inclination of the slope at the seal edge surface side is smaller than an inclination of the slope at the neck tube side.
Dependencies are inferred from the claim text.