Patent ID: 9632209
Date: 2017-04-25
CPC Classifications: G01S,G01V,H01L,H05K

Claim:
1. A sensor, comprising: an infrared light emitter mounted on a first position on a base; an infrared light detector mounted on a second position on said base; and a layer of infrared light blocking compound above said base, such that said infrared light blocking compound directly covers and encapsulates said infrared light emitter and said infrared light detector, wherein said infrared light blocking compound has a first thickness above said infrared light emitter at which infrared light emitted by said infrared light emitter towards the top of said light blocking compound at least partially survives passing through said infrared light blocking compound, wherein said infrared light blocking compound has a second thickness above said infrared light detector at which infrared light entering said infrared light blocking compound at least partially survives passing through said infrared light blocking compound to said infrared light detector, and wherein said infrared light blocking compound has a third thickness between said infrared light emitter and said infrared light detector that is larger than said first thickness and said second thickness, such that said infrared light blocking compound blocks transmission of substantially all infrared light traveling directly from said infrared light emitter to said infrared light detector.