Patent ID: 11935274
Assignee: WORLDCOIN FOUNDATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 16:
17. The iris scanning device of claim 12, further comprising:
a quarter waveplate; and
a mirror;
wherein the polarization beam splitter reflects a reflected portion of the second optical signal towards the mirror, the reflected portion of the second optical signal reflected by the polarization beam splitter having the first polarization;
wherein the reflected portion of the second optical signal reflected by the polarization beam splitter passes through the quarter waveplate, is reflected by the mirror, passes through the quarter waveplate, and returns to the polarization beam splitter having the second polarization; and
wherein the reflected portion of the second optical signal that returns to and passes through the polarization beam splitter having the second polarization is the second portion of the second optical signal having the second polarization.