Method of making a pinch-sealed, gas-filled incandescent lamp
AssigneesKoito Manufacturing Co., Ltd., Nissei Industries
InventorsChikara Tokuhara, Tetsuro Hara
Life of this patent
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Abstract
A method of manufacturing an incandescent lamp which has a tube extending through the pinch seal of the glass envelope both for evacuating the same and for subsequently introducing a halogen gas therein. An envelope blank has its open end portion heated prior to pinch sealing, with a filament mount assembly inserted therein but with the gas exhaust/supply tube not inserted to preclude the possibility of its clogging. Only after the open end portion of the envelope blank has been heated to a viscid state is the gas exhaust/supply tube inserted therein. The envelope blank is pinch sealed immediately thereafter.
Claims7
A method for producing a pinch-sealed incandescent lamp, comprising the steps of:
- (a) providing an envelope blank of vitreous material having an open end portion;
- (b) inserting a mount assembly comprising a pair of lead wires supporting a filament into said blank;
- (c) heating said end portion to a temperature at which said end portion becomes moldable;
- (d) inserting a gas exhaust/supply tube of vitreous material into said end portion after said end portion has reached said moldable temperature;
- and
- (e) pinch-sealing said end portion with said mount assembly and said gas exhaust/supply tube inserted therein.
A method for producing a pinch-sealed incandescent lamp, comprising the steps of:
- (a) providing an envelope blank of vitreous material having an open end portion;
- (b) inserting a mount assembly comprising a pair of lead wires supporting a filament into said blank;
- (c) heating said end portion to a temperature at which said end portion becomes moldable;
- (d) inserting a gas exhaust/supply tube of vitreous portion of a time period during said heating of said end portion such that said tube is heated to a temperature less than a temperature at which said tube becomes viscid;
- and
- (e) pinch-sealing said end portion with said mount assembly and said gas exhaust/supply tube inserted therein.
Dependencies are inferred from the claim text.