Sensor Aluminum Alloy Plastic Plastic.
1 - A laser beam is focused on the weaker tracks with the data that was previously recorded by a laser beam
more intense.
2 - The laser beam is reflected by the surface existing in the aluminum alloy layer.
When the beam passes through the league,
polarizing the aligned crystals, allowing to pass only light rays that are vibrating in a certain direction.
3 - The sensor reads the reflected light and determines the direction of its polarization.
The alignment of the crystals in bits 1 polarizes
light in one direction, while the alignment of crystals in bits 0 polarized in the other direction.
Source: Evolution of Computers
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