Method of making discharge lamp having blow-molded arc tube ends

Details Method of making discharge lamp having blow-molded arc tube ends Method of making discharge lamp having blow-molded arc tube ends

1974-11-11

1976-02-24

Lake, Roy

Metal working

Barrier layer or semiconductor device making

Barrier layer device making

65110, 316 17, H01J 900

Patent

active

039395383

ABSTRACT:
In arc discharge lamps containing a mixture of metals and halogen, and especially where an unvaporized excess of one metal is present, lamp color is very sensitive to end chamber shape. Color uniformity in production lamps using quartz arc tubes varying appreciably in diameter and wall thickness is greatly improved by molding end chambers of constant size and shape in the ends. The chamber may be formed at the time the end is pinched and the electrodes sealed in by using pinching jaws having a mold defining portion and momentarily pressurizing the arc tube to expand the heated and still plastic end into the mold. In production all lamps will have their ends expanded or belled to some extent, more in lamps close to the minimum diameter limit and less in lamps close to the maximum diameter limit.

REFERENCES:
patent: 760789 (1904-05-01), Hewitt
patent: 2235515 (1941-03-01), Carpenter
patent: 2844919 (1958-07-01), Power
patent: 2857712 (1958-10-01), Yoder et al.
patent: 2965698 (1960-12-01), Gottschalk
patent: 3290134 (1966-12-01), Camarata
patent: 3324332 (1967-06-01), Waymouth et al.
patent: 3593056 (1971-07-01), Degawa et al.
patent: 3665235 (1972-05-01), Hugot

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