Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Kouichi Isobe0
Masayasu Ito0
Date of Patent
November 8, 2005
0Patent Application Number
108254080
Date Filed
April 15, 2004
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A vehicular lamp used for a vehicle includes a semiconductor light emitting element for emitting light, a resistor for current detection for causing a current detection voltage in response to a current flowing through the semiconductor light emitting element, the resistor being coupled in series to the semiconductor light emitting element, a serial diode being coupled in series to the resistor for current detection and the semiconductor light emitting element in a forward direction, and an open circuit detecting unit for detecting an open circuit of the semiconductor light emitting element based on a sum voltage, which is a sum of a forward voltage of the serial diode and the current detection voltage.
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