Proximity sensor based on projection of structured light

Details Proximity sensor based on projection of structured light Proximity sensor based on projection of structured light

2003-11-11

2008-12-02

Luu, Thanh X (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S216000

Reexamination Certificate

active

07459670

ABSTRACT:
This invention relates to a proximity sensor. An illumination means (2) projects an array of spots (40) towards a scene. Detector (8) looks towards the scene through a mask (6). The mask (6) is arranged such that light from a target at a certain range, for instance far object (14) is not transmitted to the detector. Light reflected from a close object (16) however passes through the mask (6) and is incident on the detector (8). A rise in the intensity of incident light at the detector (8) is determined by threshold detector (10) and used to operate an alarm (12).

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