EP 1276353 A1 20030115 - LAMP STATE DETECTOR AND LAMP STATE MONITOR USING LAMP STATE DETECTOR
Title (en)
LAMP STATE DETECTOR AND LAMP STATE MONITOR USING LAMP STATE DETECTOR
Title (de)
LAMPENZUSTANDSDETEKTOR UND LAMPENZUSTANDSÜBERWACHUNGSEINRICHTUNG MIT EINEM SOLCHEN DETEKTOR
Title (fr)
DETECTEUR D'ETAT DE LAMPE ET CONTROLEUR D'ETAT DE LAMPE FAISANT INTERVENIR LEDIT DETECTEUR
Publication
Application
Priority
JP 9907110 W 19991217
Abstract (en)
It is judged on the basis of the illuminance of the light, emitted from a lamp, which has been measured by an illumination photometer whether or not the exchange of the lamp is required, whereby when the illuminance of the lamp has been reduced due to the blackening of the lamp, the time when exchanging the lamp can be judged before the illuminance of the lamp has become equal to or lower than the necessary illuminance. In addition, it is judged on the basis of the resistance value of the lamp which has been measured by a resistance measuring device whether or not the exchange of the lamp is required, whereby when the illuminance of the lamp has been reduced due to the degradation of the filament, the time when exchanging the lamp can be judged before the illuminance of the lamp has become equal to or lower than the necessary illuminance. As a result, for both of the reduction of the illuminance of the lamp due to the blackening of the lamp and the reduction of the illuminance of the lamp due to the breaking of the filament, the time when exchanging the lamp can be judged before the illuminance of the lamp has become equal to or lower than the necessary illuminance. <IMAGE>
IPC 1-7
IPC 8 full level
H05B 37/03 (2006.01)
CPC (source: EP US)
H05B 47/20 (2020.01 - EP US)
Designated contracting state (EPC)
DE FR GB SE
DOCDB simple family (publication)
WO 0145472 A1 20010621; CN 1335044 A 20020206; EP 1276353 A1 20030115; EP 1276353 A4 20030326; JP 4032741 B2 20080116
DOCDB simple family (application)
JP 9907110 W 19991217; CN 99801247 A 19991217; EP 99959886 A 19991217; JP 2001546222 A 19991217