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Osram Opto Launches New IR LED For Iris Scanners

Semiconductor For You by Semiconductor For You
March 3, 2017
in Semiconductor News
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                              Oslux IRED designed to illuminate eyes evenly, simplifying identification of iris patterns

Osram Opto Launches New IR LED For Iris Scanners

       Osram Opto Semiconductors is set to present a new infrared LED (IRED) for iris scanners at the upcoming Mobile World Congress. According to the company, the SFH 4787S illuminates the eyes so evenly that the software identifying the iris pattern now hardly needs to correct artefacts.

Like its predecessor (the SFH 4786S), the direction of emission of the new SFH 4787S is slightly angled rather than vertical, thus simplifying the design process by eliminating the usual mechanical aids.

Osram Opto Semiconductors introduced its first generation of this technology for smartphones and mobile devices a couple of years ago. This was followed by a version with a slightly angled direction of emission, which meant that designers no longer needed mechanical aids to tilt the entire LED.

Osram IRED for iris recognition meets another need in this application: the brightness differences in the camera images should ideally only originate from the iris pattern and not be additionally caused by a gradient in the illumination. This would mean that the software needs to correct fewer artefacts when determining the iris pattern.

With the SFH 4787S, Osram has developed an emitter with a flat light, optimising the reflector and lens to ensure virtually constant intensity across the emitted light beam.

Apart from this, the SFH 4787S is almost identical to its predecessor, the SFH 4786S. Both are based on the 3.5 x 3.5 x 1.6mm Oslux package. A wavelength of 810 nm delivers high-contrast images for all eye colours. The emission direction is tilted by 8degress, while the emission angle is ±18 degrees. The optical output of the emitter is 720 mW at a current of 1A, with a radiant intensity of 1,000 mW/sr.

Industrial applications gaining ground

  • The  impetus to develop more compact and reliable iris scanners was driven by the need for dependable solutions to safeguard mobile devices from unauthorised access.
  • Gradually, the technology is now making its way into other sectors. “Access control as a whole is becoming increasingly important and iris recognition remains one of the most reliable methods here,” explains Bianka Schnabel, marketing manager at Osram Opto Semiconductors.
  • “Following in the footsteps of consumer markets, we are now also seeing an upswing in interest from various industries.”

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