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The color of the CD-R disc is related to the color of the specific dye
that was used in the recording layer. This base dye color is modified
when the reflective coating (gold or silver) is added. Some of the
dye-reflective coating combinations appear green, some appear blue and
others appear yellow. For example, gold/green discs combine a gold
reflective layer with a cyan-colored dye, resulting in a gold appearance
on the label side and a green appearance on the writing side. Taiyo Yuden
produced the original cyanine dye-based gold/green CDs, which were used
during the development of the Orange Book standard. Mitsui Toatsu Chemicals
invented the process for gold/gold CDs. Silver/blue CD-Rs, manufactured
with a process patented by Verbatim, first became widely available in 1996.
Ricoh's silver/silver "Platinum" discs, based on "advanced phthalocyanine
dye", appeared on the market in mid-1998.
The disc has a spiral track which is preformed during manufacture, onto
which data is written during the recording process. This ensures that
the recorder follows the same spiral pattern as a conventional CD, and
has the same width of 0.6 microns and pitch of 1.6 microns as a conventional
disc. Discs are written from the inside of the disc outward. The spiral
track makes 22,188 revolutions around the CD, with roughly 600 track
revolutions per millimetre.
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CD DVD Duplicator Instead of mechanically pressing a CD with indentations,
a CD-R writes data to a disc by using it's laser to physically burn
pits into the organic dye. When heated beyond a critical temperature,
the area "burned" becomes opaque (or absorptive) through a chemical reaction
to the heat and subsequently reflects less light than areas that have not been
heated by the laser. This system is designed to mimic the way light
reflects cleanly off a "land" on a normal CD, but is scattered by a
"pit", so a CD-R disc's data is represented by burned and non-burned areas,
in a similar manner to how data on a normal CD is represented by its
pits and lands. Consequently, a CD-R disc can generally be used in a
normal CD player as if it were a normal CD.
See also
1-1 DVD Duplicator, and pages
DVD Tower Duplicators. |
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