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LED with Integrated Lens Improves Vision System Operation

Tue, 05/04/2010 - 9:48am
OSRAM Opto Semiconductors IR DRAGON LED - SFW 4236OSRAM Opto Semiconductors’ infrared DRAGON SFH 4236 adds depth to the IR DRAGON family by maximizing radiant intensity from a small form factor. The new infrared DRAGON is designed for applications that require narrow radiation characteristics from limited board space, namely automotive applications such as driver and passenger monitoring systems and blind spot detection systems, as well as camera-based vision systems for the industrial and security sectors.

OSRAM’s SFH 4232 IR LED achieves a typical radiant intensity of 650 mW/sr at a DC current of 1 A, more than three times that of the standard IR DRAGON. The device emits at a wavelength of 850 nm and is the best compromise between maximum spectral sensitivity for CCD and CMOS cameras and suppressed visibility for the human eye.

“Designed with automotive applications in mind, the total height of the new SFH 4236 is about 35% smaller compared to conventional DRAGON solutions with an external lens,” said Sevugan Nagappan, Marketing Manager Infrared Devices at OSRAM Opto Semiconductors, Inc. The integrated lens of the SFH 4236 concentrates the emitted infrared light within a viewing angle of +/-20°, eliminating the need for a complex, expensive external lens assembly.

The footprint is identical to that of the other IR DRAGON devices, and the SFH 4236 can be used as a drop-in replacement in existing designs. It exhibits the same electrical parameters as the standard IR DRAGON and is suitable for reflow soldering.

The 850 nm IR DRAGON family consists of the standard version SFH 4232, the stack version SFH 4235 with twice the total radiant flux, and the new SFH 4236 with integrated lens.

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