Brochure

www.osram-os.com
18 / 192018-08-16 | Document No.: AN097
might alter the overall radiation level in a way that it complies with the IEC-62471
standard.
In case eye safety is a concern it is recommended to use a proximity sensor, e.g.
SFH 7776 or directly the SFH 4780S in connection with e.g. SFH 7771 to ensure
that the high-power operation of the IR-LED is disabled / reduced to reasonable
levels in case “something” is close to the SFH 4780S. In this context one might
highlight again the fact that for the retinal exposure case the human eye is not
able to focus on elements as close as 1 cm [2].
Please note that eye safety classification of the final product, using IR-LEDs, is
the responsibility of the final equipment manufacturer. In doubt, consult
specialists to ensure eye safety in the application.
For further details on this topics please refer to the OSRAM Opto Semicondutors
application note “Eye safety of IREDs used in lamp applications” and the relevant
local standards.
C. Summary
The SFH 4780S is a component specially designed to optimize iris recognition
systems. The high-power, narrow-angle features make the SFH 4780S ideally
suited for the next generation of mobile devices as it unifies compact design and
high performance for maximum user experience.
D. Literature
[1] John Daugman, “How iris recognition works,” IEEE Trans. on Circuits and
Systems for Video Technology, 14(1): 21−30, January 2004.
[2] Intl. Commission on Non-Ionizing Radiation Protection (ICNIRP), “ICNIRP
GUIDELINES ON LIMITS OF EXPOSURE TO INCOHERENT VISIBLE AND
INFRARED RADIATION,” Health Pysics, 105(1):74-96; 2013.
[3] Intl. Commission Standard, “Information technology — Biometric data
interchange formats – Part 6: Iris image data,” 2nd Ed.; ISO/IEC 19794-
6:2011(E); 2011.