Transparent polycrystalline alumina and high pressure vapor disc

Details Transparent polycrystalline alumina and high pressure vapor disc Transparent polycrystalline alumina and high pressure vapor disc

1978-03-06

1980-01-08

Gantz, Delbert E.

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For plural electrodes of discharge device

106 734, 106 732, H01J 1716, C04B 3510, C04B 3550

Patent

active

041829727

ABSTRACT:
A polycrystalline alumina has at least 50% unit surface area provided by crystals of at least 60 .mu.m, and preferably 100 .mu.m size. This improves the in-line transmission value and hence lamp efficiency in a tube for a high pressure metal vapor lamp having an envelope of alumina.

REFERENCES:
patent: 3026210 (1962-03-01), Coble
patent: 3769049 (1973-10-01), Muta et al.
patent: 3792142 (1974-02-01), Kobayashi et al.
patent: 3846146 (1974-11-01), Hunting et al.
patent: 3875277 (1975-04-01), Bratton et al.

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