Rectangular illumination field betters cost efficiency of cabin monitoring systems

New Products |
By Christoph Hammerschmidt

A new product family from ams Osram no longer illuminates a more or less circular area as before, but a rectangular field with an aspect ratio of 4:3. This aspect ratio corresponds to that of wide-angle cameras in car cabin monitoring systems. As a result, the manufacturer promises improved optical power distribution and homogeneity of the IR illumination inside the vehicle. This means that the use of secondary optics can be dispensed with in the design of such monitoring systems; the devices become simpler and more cost-effective.

ams Osram’s new IR LED SFH47278AS A01 from the Oslon Black product range produces a 155° x 130° field of illumination (FoI), the FoI of the SFH47267AS A01 is 135° x 110°. Automotive manufacturers and suppliers using the SFH47278AS A01 or SFH47267AS A01 emitters can reduce the complexity and cost of the optical stack in cabin monitoring systems while improving the quality and reliability of the IR images they capture.

Such cabin systems support safety-critical applications such as driver distraction and drowsiness monitoring, occupant detection and seat belt detection.

The new Oslon Black IR LEDs provide a more homogeneous output than a modified omnidirectional beam, as well as better optical power distribution across the camera’s field of view. This results in better imaging and therefore more accurate and reliable performance of functions that require detailed image analysis, such as driver distraction detection.

The AEC-Q102 qualified SFH47278AS A01 and SFH47267AS A01 emitters produce infrared light with a wavelength of 940nm with a maximum pulsed forward current of 5.0A. The new products feature the same housing and pinout as the rest of the Oslon Black family, allowing customers to easily convert their LED circular beam designs to the new products.



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