Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1976-03-03
1978-02-14
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315108, 315109, 315200R, 315362, 315DIG1, H05B 4136
Patent
active
040741729
ABSTRACT:
The invention relates to a device for operating a low-pressure sodium vapor discharge lamp without a stabilizing ballast.
The lamp is provided with a discharge tube having first and second main electrodes opposing a third main electrode. An automatically operating change-over switch occasionally switches the lamp current to either the first or second electrodes. A reservoir of liquid sodium near the first electrode affects sodium vapor pressure in the discharge tube by the switching action.
REFERENCES:
patent: 1943846 (1934-01-01), Spaeth
patent: 2103039 (1937-12-01), Pirani et al.
patent: 3864599 (1975-02-01), Wesselink et al.
Ponsen Gijsbert J.
Roelofs Hendrik
Wesselink Gustaaf A.
LaRoche Eugene R.
Smith Robert S.
Trifari Frank R.
U.S. Philips Corporation
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