Electric lamp and discharge devices – With temperature modifier – Double wall – jacket or casing for envelope
Patent
1989-05-05
1989-12-19
Wieder, Kenneth
Electric lamp and discharge devices
With temperature modifier
Double wall, jacket or casing for envelope
313113, 313573, 313580, 313635, H01J 6134, H01J 6135, H01J 6150, H01K 134
Patent
active
048885177
ABSTRACT:
A double-enveloped lamp having a shield surrounding a light-source capsule within a thick-walled outer envelope so that the lamp may be safely operated without necessity of a protective fixture. In the rare event of a burst of the light-source capsule, the shield absorbs and dissipates a portion of the burst energy sufficient to permit the thick-walled outer envelope to remain intact and contain shards and other internal parts within the lamp. In alternate embodiments, the shield may be reinforced, such as with a wire mesh, or the outer envelope may be reinforced, such as with a polymer coating, or both. A thin-walled capsule may be employed in combination with a shield and thick outer envelope. A lamp in accordance with the invention provides the unexpected benefits of improved luminous efficacy and better color rendering characteristics, since the presence of an optimally positioned shield causes the operation of the light-source capsule to be more nearly isothermal.
REFERENCES:
patent: 4342937 (1982-08-01), Nagel
patent: 4345178 (1982-08-01), Pappas
patent: 4459506 (1984-07-01), Beck
patent: 4490642 (1984-12-01), Dobrusskin et al.
patent: 4591752 (1986-05-01), Thouret et al.
patent: 4721876 (1988-01-01), White et al.
Bazin Simone P.
Karlotski Robert J.
Keeffe William M.
Kulik Joseph S.
GTE Products Corporation
Romanow Joseph S.
Wieder Kenneth
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