Title:
DISCHARGE LAMP WITH MOUNT FOR AUTOMATICALLY HOLDING CENTRAL POSITION AND COMPENSATING MOUNT
Document Type and Number:
Japanese Patent JPS57202636
Kind Code:
A
Abstract:
A high pressure sodium vapor discharge lamp having an arc tube coaxially mounted within an outer glass envelope by means including a coiled spring engaging one end of the arc tube and coaxially disposed in the partially compressed state between that end of the arc tube and a dome portion of the outer envelope. In one embodiment the dome of the outer envelope is disk-shaped and a large diameter end of the coiled spring bearing against the dome is constrained in a coaxially centered position by the sidewalls of the outer envelope. In another embodiment, the dome of the outer envelope is provided with an inwardly projecting dimple about which the coiled spring is coaxially fitted to provide self-centering of the arc tube. The partially compressed spring compensates for arc tube length variations and thermal expansion. Mount shadows are reduced by connecting the remote terminal of the arc tube to a lead-in conductor through a fine diameter helically bent wire extending through the outer envelope beyond the length of the arc tube.
Inventors:
FURANSHISU AARU KOZA
RICHIYAADO EI PAROTSUTO
RICHIYAADO EI PAROTSUTO
Application Number:
JP9149282A
Publication Date:
December 11, 1982
Filing Date:
May 31, 1982
Export Citation:
Assignee:
SYLVANIA ELECTRIC PROD
International Classes:
H01J61/50; H01J61/34; (IPC1-7): H01J61/00
Domestic Patent References:
| JPS4315095Y1 | 1968-06-24 | |||
| JPS5022685B1 | 1975-08-01 |