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CD Readback System
Light emitted from a semiconductor laser is collected by a collimating lens and focused by an objective lens through the clear disc substrate onto the pits. Light of high intensity (between pits) or low intensity (on a pit) is reflected from the metallized surface back through the objective lens. The reflected light then passes through a beamsplitter, which redirects the light onto an optical detector. Electronics amplify and decode the detector signal to produce a computer bit stream. (See Figure 3, How "real" computer data is generated from a CD-ROM.)
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BKlaine@odiscs.com |
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A compact optical head in a CD player
"reads" the pits. 
