Lighting Device for a Motor Vehicle

摘要

The invention relates to a lighting device for a motor vehicle, comprising a light guide for the totally reflecting guidance of light from two light sources along a light propagation axis, wherein the light from one light source can be coupled in at an in-coupling face on one end face of the light guide and the light from the other light source can be coupled in at another in-coupling face on another end face of the light guide. The light guide also has an out-coupling face arranged along the light propagation axis for coupling the light out, which light exits from the light guide at an exit face arranged along the light propagation axis where the total reflection condition is removed. The lighting device according to the invention is characterized in that the light guide is designed in such a manner that the light intensity distribution of the light from at least one light source exiting at the exit face has a gradient in the propagation direction of the light from the light source concerned, and a control device for the light sources (is provided in such a manner that, when the lighting device is switched on, the light sources are activated at a predefined switch-on time interval and thereby the brightness of at least one light source is modified on the basis of a ramped or stepped progression until a predefined brightness value is achieved.

主权项

1. A lighting device for a motor vehicle, comprising:
a light guide for totally reflecting guidance of light from two light sources along a light propagation axis, wherein light is coupled in from one of the two light sources at a coupling face on one end face of the light guide, and light is coupled in from the other of the two light sources at another coupling face on another end face of the light guide, wherein the light guide further comprises a decoupling face arranged along the light propagation axis for decoupling light which exits from the light guide at an exit face arranged along the light propagation axis accompanied by cancelation of the total reflection condition, wherein the light guide is configured such that the light intensity distribution of light, exiting at the exit face, of at least one of the two light sources has a gradient in the propagation direction of the light from the at least one of the two light sources; and a control device configured to activate the two light sources in a prescribed switch-on time interval when the lighting device is switched on, and wherein the brightness of at least one of the two light sources is modified on the basis of a ramp and/or step profile until a prescribed brightness value is reached, such that a centroid of the overall light distribution resulting at the exit face from the light intensity distributions of the two light sources travels in the prescribed switch-on time interval along the light propagation axis to one of said coupling faces.