LIGHTING CONTROL CIRCUIT FOR ROOM LAMP

LIGHTING CONTROL CIRCUIT FOR ROOM LAMP

PROBLEM TO BE SOLVED: To lengthen the life of a door switch contact and to prevent an excess current from flowing in an electric field effect type transistor FET. SOLUTION: An offdelay circuit 22 is provided with a door switch 23 which is closed when a door is opened and opened when the door is clos...

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Bibliographische Detailangaben
1. Verfasser: IIZUKA KAORU
Format: Patent
Sprache:eng
Schlagworte:
ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING ORSUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES INGENERAL
PERFORMING OPERATIONS
TRANSPORTING
VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:PROBLEM TO BE SOLVED: To lengthen the life of a door switch contact and to prevent an excess current from flowing in an electric field effect type transistor FET. SOLUTION: An offdelay circuit 22 is provided with a door switch 23 which is closed when a door is opened and opened when the door is closed; a transister Tr which is turned on when the door switch 23 is closed and turned off when the door switch 23 is opened; and a time constant circuit to begin charging by turning on the transister Tr. The device is equipped with an electric field effect type transister FET which is turned on by the charging voltage of the time constant circuit and drop a current flowing in a roomlamp 20 to an earth for turning on the room lamp 20 for a fixed time after closing of the door, and a side which is connected to the working switch 21 of the electric field effect type transister FET is earthed through the door switch 23.