High-intensity discharge lamp
First Claim
1. A high-intensity discharge lamp with a built-in starter, comprising an arc tube comprising a pair of main electrodes, a starting circuit having a thermally-actuated switch with contacts for disconnecting the starting circuit, and an outer tube for containing the arc tube and the starting circuit, the lamp being configured to be lighted up by a reactance ballast,wherein the thermally-actuated switch comprises an envelope bulb that covers the contacts of the thermally-actuated switch.
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Accused Products
Abstract
A high-intensity discharge lamp includes an arc tube having a pair of main electrodes, a starting circuit having a thermally-actuated switch for disconnecting the starting circuit, and an outer tube for containing the arc tube and the starting circuit, and the lamp is lighted by means of a reactance ballast. The thermally-actuated switch includes an envelope bulb that covers contacts of the thermally-actuated switch. Thereby, occurrence of sustained arc discharge in the outer tube is prevented in the case of a starting failure or a break-off of the arc tube at the end of the lamp'"'"'s life.
12 Citations
6 Claims
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1. A high-intensity discharge lamp with a built-in starter, comprising an arc tube comprising a pair of main electrodes, a starting circuit having a thermally-actuated switch with contacts for disconnecting the starting circuit, and an outer tube for containing the arc tube and the starting circuit, the lamp being configured to be lighted up by a reactance ballast,
wherein the thermally-actuated switch comprises an envelope bulb that covers the contacts of the thermally-actuated switch.
Specification