Electric lamp with high outer-envelope to inner- envelope...

Details Electric lamp with high outer-envelope to inner- envelope... Electric lamp with high outer-envelope to inner- envelope...

H - Electricity

01

K

313/10

H01K 1/34 (2006.01) H01J 61/34 (2006.01) H01J 61/50 (2006.01)

Patent

CA 1218103

-9- ABSTRACT An electric lamp having a relatively high outer-envelope to inner-envelope wall-thickness ratio whereby the risk of a containment failure of the lamp is substantially eliminated. In an alternate embodiment, the outer envelope has a concave top. In another embodiment, the neck of the outer envelope has a relatively thick wall. Lamps having a wall-thickness ratio falling within the prescribed range, i.e., approximately equal to or greater than 3, have the property that the outer envelope will contain shards of the inner light-source capsule in the unlikely event such inner capsule should burst.

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