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Nearly every movie produced today is available on DVD, and many older movies are being moved to the DVD format. Often, a movie comes out on DVD before it comes out on video tape, because the manufacturing and distribution costs for DVDs are so much lower!
Williams Products Used – Silicon™, Sil-R™, Sil-X™, Sil-XL™
Sputtering targets, including Si, Au, Ag, Al, Cu and alloys of the like, are fabricated for all industry metallizers. Targets are manufactured using Williams’ proprietary SFG process ensuring fine metallurgical grain and optimal film uniformity.
How does a DVD work?
DVDs are of the same diameter and thickness as CDs, and they are made using some of the same materials and manufacturing methods. Like a CD, the data on a DVD is encoded in the form of small pits and bumps in the track of the disc.
A DVD is composed of several layers of plastic, totaling about 1.2 millimeters thick. Each layer is created by injection molding polycarbonate plastic. This process forms a disc that has microscopic bumps arranged as a single, continuous and extremely long spiral track of data.
Once the clear pieces of polycarbonate are formed, a thin reflective layer is sputtered onto the disc, covering the bumps. Aluminum is used behind the inner layers, but a semi-reflective (Au, Si, or Ag alloy) layer is used for the outer layers, allowing the laser to focus through the outer and onto the inner layers. After all of the layers are made, each one is coated with lacquer, squeezed together and cured under infrared light. For single-sided discs, the label is silk-screened onto the nonreadable side. Double-sided discs are printed only on the nonreadable area near the hole in the middle.
Schematic Diagram
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