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Safety feature for automotive lamp

IP.com Disclosure Number: IPCOM000180538D
Publication Date: 2009-Mar-11
Document File: 2 page(s) / 310K

Publishing Venue

The IP.com Prior Art Database

Abstract

ID 675497

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ID 675497

Safety feature for automotive lamp

In case one of the headlights of a car breaks down, the driver is often unaware of this. This is due to the fact that such a breakdown causes a constant disturbance in the light pattern that is hard to notice. Therefore the driver's risk to be involved in an accident is increased (especially if the light on the driver's side brakes down).

A standard H4 automotive headlight bulb carries two filaments, one for the high beam and one for the low beam. The filament for the low beam almost always breaks down first, since it is used non-stop. The other filament is used occasionally, and therefore generally is in perfect working order when the low beam filament breaks down.

The idea is that, in case the low beam filament breaks down, the high beam filament can take over the task of the low beam filament. It is not intended as a replacement, since the angle at which the light is emitted is too high. The light level should be reduced in such a way that the broken headlight is merely visible, not blinding the traffic ahead. This low level visibility increases the safety of the driver dramatically.

A second functionality is driver notification of the broken headlight. It is not the intention of this idea that the driver keeps driving around until eventually the high beam filament breaks down as well. From the driver's viewpoint it is hard to see that one of the headlights is not working, therefore the driver should be notified. The light bulb itself can do this notification. Since the high beam filament is glowing at a low intensity it can use higher intensity light levels in short infrequent pulses to warn the driver. For instance the high beam can have a continuous light level of 5%, while once every 5 minutes it could for instance be increased to 40% for 2 seconds. A constant distu...