Patent ID: 9654222
Date: 2017-05-16
CPC Classifications: G02B,G06F,G06K,G06Q,G06T,G08C,H04B,H04M,H04N,H04W

Claim:
1. A first transmitter comprising: a first light source; and a first collimator including a first portion and a second portion each of which being rotationally symmetric about an optical axis substantially centered on a light-emitting element of the first light source, the first portion of the first collimator having a broad middle body between a narrow circular first entrance pupil and a narrow circular first exit pupil, the broad middle body having a first diameter greater than a second diameter of the narrow circular first entrance pupil and greater than a third diameter of the narrow circular first exit pupil, the second portion of the first collimator having a flared body between a narrow circular second entrance pupil and a broad circular second exit pupil, the narrow second entrance pupil being coupled to, and having the same diameter as, the narrow circular first exit pupil, a fourth diameter of the broad second exit pupil being greater than the first diameter of the broad middle body of the first portion, the narrow first entrance pupil positioned near the light source to receive light from the first light source and emit the light from the broad second exit pupil.