US 4,731,040 A · Method and apparatus for manufacturing cathode ray tube

Abstract

In a method for manufacturing a cathode ray tube, a bulb is held by a first holding mechanism. An electron gun is inserted and held in a neck portion of the bulb by a second holding mechanism. Then, the neck portion and a stem of the electron gun are welded by a welding unit. The unit includes an annular burner having an inner surface with a plurality of burner holes formed in substantially the entire area along a circumferential direction thereof. The annular burner is constructed by two burner members which can be separated in a radial direction. The burner is positioned by an opening/closing mechanism and a reciprocating mechanism such that the inner peripheral surface of the burner is coaxially located outside the neck portion and opposes the stem of the electron gun. Thereafter, the neck portion is heated by flames injected from the burner holes, and then the burner is reciprocally rotated about its axis through a predetermined angle.

Claims11

Dependent claims

A cathode ray tube manufacturing method for welding a neck portion of a cathode ray tube bulb and a stem of an electron gun inserted in the neck portion, comprising the steps of:

holding said cathode ray tube bulb;
inserting and holding said electron gun at a predetermined position in the neck portion;
positioning an annular burner, which has an inner peripheral surface with a plurality of burner holes formed in substantially the entire area along a circumferential direction thereof, such that the inner peripheral surface is coaxially located outside the neck portion and opposes the stem of the electron gun, said burner being formed to be capable of being divided into halves in a radial direction;
injecting flames from the burner holes toward the neck portion;
and
reciprocally rotating the annular burner about its axis through a predetermined angle.

3 more elements

A manufacturing apparatus for welding a neck portion of a cathode ray tube bulb and a stem of an electron gun inserted in the neck portion, comprising:

first holding means for holding the cathode ray tube bulb;
second holding means for holding the electron gun in a state wherein the electron gun is inserted at a predetermined position in the bulb;
and
a welding unit for welding the neck portion and the stem, said welding unit including an annular burner having an inner peripheral surface with a plurality of burner holes formed in substantially the entire area along a circumferential direction thereof, said annular burner having two burner members that can be separated along a radial direction, an opening/closing mechanism for moving said burner members to a closed position where the burner members constitute the annular burner, and an open position where the burner members are separated from each other, a reciprocating mechanism for moving the burner to a heating position where the inner peripheral surface of the burner is coaxially positioned outside the neck portion while opposing the stem, and a non-heating position where the burner is separated from the neck portion, and a rotating mechanism for reciprocally rotating the burner about its axis through a predetermined angle.

1 more element

Dependencies are inferred from the claim text.

Method and apparatus for manufacturing cathode ray tube

Life of this patent

Method and apparatus for manufacturing cathode ray tube

Life of this patent

Abstract

Claims11