Signal transmisson system and vehicular lamp

Details Signal transmisson system and vehicular lamp Signal transmisson system and vehicular lamp

2007-11-13

2007-11-13

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Special application

Vehicle

C315S291000, C307S010800

Reexamination Certificate

active

11079429

ABSTRACT:
There is provided a vehicular lamp that can be miniaturized by reducing signal lines connected to a vehicle main body. The vehicular lamp that is used for a vehicle includes a light source unit, and a signal line that connects the light source unit and a light source controlling unit for controlling lighting of the light source unit, in which the light source unit includes: a semiconductor light-emitting element; an optical member that irradiates light emitted from the semiconductor light-emitting element to the outside of the vehicle; a lighting controlling unit to which electric power is supplied from a vehicle main body and that control an electric current supplied to the semiconductor light-emitting element according to a voltage applied to the signal line by the light source controlling unit in order to control a light amount of the semiconductor light-emitting element; a current detecting resistor that is connected to the semiconductor light-emitting element in series; a current driving resistor that is connected to the signal line in series; and a comparator that sinks the current flowing into the current driving resistor and the same signal line as the signal line when a voltage is generated on the current detecting resistor by the current flowing into the semiconductor light-emitting element.

REFERENCES:
patent: 6002215 (1999-12-01), Yamashita et al.
patent: 6392364 (2002-05-01), Yamamoto et al.
patent: 7205680 (2007-04-01), Takeda et al.
patent: 2002/0047531 (2002-04-01), Sugimoto et al.
patent: 2003/0117088 (2003-06-01), Tanabe et al.
patent: 2004/0066154 (2004-04-01), Ito et al.
patent: 2004/0183476 (2004-09-01), Ishizuka
patent: 2002-231013 (2002-08-01), None
Patent Abstracts of Japan, Publication No. 2002-231013 dated Aug. 16, 2002, 1 page.

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