Word: photodetector
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Dates: during 1972-1972
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...Piet Kramer and their 25-person team, uses a helium-neon laser beam instead of a needle. And instead of grooves, Philips' shiny aluminum disks have millions of microscopic "pits" that produce variations in the intensity of the laser beam's reflection as the disk spins. A photodetector translates the reflection into electrical impulses, which are then fed to the TV screen. The color is truer than that of any image transmitted over the air from a TV station. The disk could also carry stereo sound along with the picture...
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