Abstract A method of sealing display cathodes in a glass envelope wherein the cathodes having lead wires attached thereto are inserted into a glass envelope having an insertion port. A heatproof insulating stem is then inserted into the glass envelope to a position based inwardly from the insertion port. The stem has apertures which receive the lead wires of the cathodes so that they lead out to the insertion port side of the envelope. Fusion glass is then packed in the space between the stem and the part of the glass envelope about the insertion port and in the spaces formed between the lead wires and the apertures. The fusion glass is then heated by an infrared radiation source to simultaneously fuse and integrally bond the stem with both the lead wires and glass envelope.
A method of sealing a glass envelope for electronic tubes as claimed in claim 1 wherein the fusion glass is infrared ray absorbing glass.
Claim 2
Dependent Claim
30 words
A method of sealing a glass envelope for electronic tubes as claimed in claim 1 wherein the fusion glass is a mixture of infrared ray absorbing glass with black carbon.
Claim 3
Dependent Claim
31 words
A method of sealing a glass envelope for electronic tubes as claimed in claim 1 wherein the fusion glass is a mixture of infrared ray absorbing glass with chrome oxide powder.
Claim 4
Dependent Claim
34 words
A method of sealing a glass envelope for electronic tubes as claimed in claim 1 wherein the fusion glass is a mixture of infrared ray absorbing glass with black carbon and chrome oxide powder.
Claim 5
Dependent Claim
24 words
A method of sealing a glass envelope for electronic tubes as claimed in claim 1 wherein the heatproof insulating stem is made of ceramic.
Claim 6
Dependent Claim
25 words
A method of sealing a glass envelope for electronic tubes as claimed in claim 1 wherein the fusion glass is in the form of powder.
Claim 7
Dependent Claim
26 words
A method of sealing a glass envelope for electronic tubes as claimed in claim 1 wherein the fusion glass is in the form of a piece.
Claim 8
Dependent Claim
39 words
A method of sealing a glass envelope for electronic tubes as claimed in claim 1 wherein the infrared radiation source consists of an elliptic mirror and an infrared lamp disposed at one of the focuses of the elliptic mirror.