"ian field" wrote in message
news


The almost black types are ubiquitous in consumer electronics as the
integrated IR receiver modules, I was wondering why sometimes blue when
blue is at the other end of the spectrum from IR?


As long as it's transparent to IR at (usually) 850-950nM is fine. The
PhotoDiodes used in remote receivers are 'black' to block out ambient light
shorter wavelength than about 850nM.

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