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US 5,138,231 AGranted
High pressure metal vapor discharge lamp
AssigneeIwasaki Electric Co., Ltd.
InventorsTakenobu Iida, Shunichi Sasaki
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Abstract
A high-pressure metal vapor discharge lamp comprises: an arc tube, which is shunted by a series circuit of a thermal switch and a nonlinear ceramic capacitor, a pyroelectric current bypassing resistor connected in parallel to the nonlinear ceramic capacitor, and a lamp outer bulb incorporating the arc tube, the thermal switch, the nonlinear ceramic capacitor and the resistor. Because of this construction, the nonlinear ceramic capacitor is prevented from early deterioration, thus lengthening the service life of the discharge lamp.
Claims7
A high-pressure metal vapor discharge lamp, comprising:
- an arc tube which is connected to a power source;
- lamp starting means including a series circuit of a first thermal switch and a non-linear ceramic capacitor, said series circuit being connected in parallel to said arc tube, and a pyroelectric current bypassing resistor connected in parallel to said non-linear ceramic capacitor;
- and
- a lamp outer bulb incorporating said arc tube and said lamp starting means.
1 more element
Dependencies are inferred from the claim text.