DISCHARGE LAMP LIGHTING DEVICE

PROBLEM TO BE SOLVED: To detect the end of the life of a discharge lamp and to announce it at the end of the life before the discharge lamp turns off. SOLUTION: For the lamp voltage of a discharge lamp La, an allowable range specified by an upper limit value Up and a lower limit value Lw is set, and...

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Bibliographic Details
Main Authors KITADOU MASAHARU, ITO HISAHARU, MATSUMOTO TATSUHIKO
Format Patent
LanguageEnglish
Published 04.04.1997
Edition6
Subjects
ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING ORSUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES INGENERAL
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
PERFORMING OPERATIONS
TRANSPORTING
VEHICLES IN GENERAL
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Summary:PROBLEM TO BE SOLVED: To detect the end of the life of a discharge lamp and to announce it at the end of the life before the discharge lamp turns off. SOLUTION: For the lamp voltage of a discharge lamp La, an allowable range specified by an upper limit value Up and a lower limit value Lw is set, and when the voltage deviates from the allowable range, a display device 3 announces the possibility that the lamp may come to its end. When the state in which the voltage deviates from the allowable range has continued for a certain time or more that is set by a timer 27, the discharge lamp La is turned off and the end of its life is announced by means of the display device 3.
Bibliography:Application Number: JP19950248107