Patent ID: 6873111
Filing Date: 2005-03-29
Classification: B60Q,H05B,Y02B

Abstract:
1. A vehicular lamp used in a vehicle, comprising: a light source operable to emit light in accordance with a voltage given thereto; a light-source controlling transistor operable to control power supplied to said light source by repeatedly switching whether or not said power is supplied to said light source; a capacitor having one end grounded and another end at which a potential is changed like a saw-tooth by charging and discharging of said capacitor; a capacitor controlling transistor operable to control a timing at which said charging and discharging of said capacitor is switched; and a comparator operable to compare said potential at said another end of said capacitor to a reference voltage given thereto and to control a timing at which said light-source controlling transistor is turned on or off and a timing at which said capacitor controlling transistor is turned on or off in synchronization based on a result of comparison.