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US 4,520,294 AGranted
High pressure metal vapor discharge lamp
AssigneeIwasaki Electric Co., Ltd.
InventorsTakenobu Iida, Shunichi Sasaki
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Abstract
There is disclosed a high pressure metal vapor discharge lamp which contains in an outer bulb a starting circuit connected in parallel with a light emitting tube having at least one pair of main electrodes. The starting circuit includes a ceramic capacitor surrounded by glass material and exhibiting a non-linear voltage-charge characteristic.
Claims28
A high pressure metal vapor discharge lamp comprising:
- a starting circuit connected in parallel with a light emitting tube having at least one pair of main electrodes;
- said starting circuit including a serial circuit of at least;
- (i) a thermo-sensitive switch which is closed at a room temperature and opened at a high temperature,
- (ii) a voltage-sensitive semiconductor switching device surrounded by a glass material, and
- (iii) a ceramic capacitor surrounded by a glass material and exhibiting a non-linear voltage charge characteristic,
- said starting circuit and said light emitting tube being accommodated in an outer bulb having an appropriate amount of inert gas filled therein or essentially evacuated;
- and
- said starting circuit being connected to an AC power supply through an inductive stabilizer.
5 more elements
Dependencies are inferred from the claim text.