FILAMENT BREAK DETECTION METHOD AND DEVICE, DISCHARGE LAMP LIGHTING DEVICE, AND LIGHTING FIXTURE

摘要

PROBLEM TO BE SOLVED: To provide a filament break detection method, a filament break detection device, a discharge lamp lighting device, and a lighting fixture.;SOLUTION: When a filament of a discharge lamp DL equipped with a pair of filament electrodes E1, E2 is broken, the filament break is detected by detecting direct-current voltage between power-source side terminals and/or non-power-source side terminals between the pair of filament electrodes. The discharge lamp lighting device includes a discharge lamp; an electronic lighting circuit EOC for biasing it and equipped with a protective movement function; and a direct-current voltage detecting circuit DCD for detecting direct-current voltage existing between the power-source side terminals and/or non-power-source terminals between the pair of filament electrodes when the filaments are broken and detecting the filament break to make the electronic lighting circuit carry out the protective movement function.;COPYRIGHT: (C)2006,JPO&NCIPI