Electric lamp or space discharge component or device manufacturi – Process – Combined – e.g. – with shaping of lamp or device envelope
Patent
1984-08-30
1985-09-10
Ramsey, Kenneth J.
Electric lamp or space discharge component or device manufacturi
Process
Combined, e.g., with shaping of lamp or device envelope
65110, 445 43, H01J 932
Patent
active
045403732
ABSTRACT:
This invention provides an improved method of fabricating an arc tube, particularly a miniaturized arc tube having precise geometry and requiring exact electrode alignment. The improved method divides the press sealing operation into two distinct steps. In the first or preforming step, the ends of the arc tube are heated and preformed such that the ends have a substantially elliptical cross section; in the second or pressing step, the preformed ends are heated and pressed together to form completed press seals. During each step, the viscosity of the pliable glass remains low so that internal shearing forces are substantially reduced from those experienced in the prior art methods. As a result of the low viscosity during the pressing step, electrode misalignment, tearing of molybdenum foils, and deformation of the midsection of the arc tube are virtually eliminated. An electrode and a starting probe may be inserted with ease into a preformed end because of its flattened cross section. In the absence of the preforming step, a tubular blank having a larger internal diameter might be required thereby necessitating a more bulky arc tube and greater glass consumption.
REFERENCES:
patent: 3305289 (1967-02-01), Fridrich
patent: 3305747 (1967-02-01), Feinstein
patent: 3419947 (1969-01-01), Gottschalk et al.
patent: 3685880 (1972-08-01), Sobieski
English George J.
Rothwell Harold L.
GTE Products Corporation
Ramsey Kenneth J.
Romanow Joseph S.
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