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  • Patice

    nagyúr

    válasz Lompos48 #50987 üzenetére

    Pontosan! :K

    "There are three basic formulations of dye used in CD-Rs:

    1.Cyanine dye CD-Rs were the earliest ones developed, and their formulation is patented by Taiyo Yuden. CD-Rs based on this dye are mostly green in color. The earlier models were very chemically unstable and this made cyanine based discs unsuitable for archival use; they could fade and become unreadable in a few years....

    2.Phthalocyanine dye CD-Rs are usually silver, gold or light green. The patents on phthalocyanine CD-Rs are held by Mitsui and Ciba Specialty Chemicals. Phthalocyanine is a natively stable dye (has no need for stabilizers) and CD-Rs based on this are often given a rated lifetime of hundreds of years. Unlike cyanine, phthalocyanine is less resistant to UV rays and CD-Rs based on this dye show signs of degradation only after two weeks of direct sunlight exposure...

    3.Azo dye CD-Rs are dark blue in color, and their formulation is patented by Mitsubishi Chemical Corporation. Azo dye is also chemically stable, and Azo CD-Rs are typically rated with a lifetime of decades. Azo is the most resistant dye against UV rays and begins to degrade only after the third or fourth week of direct sunlight exposure. More modern implementations of this kind of dye include Super Azo which is not as deep blue as the earlier Metal Azo. This change of composition was necessary in order to achieve faster writing speeds."

    (Forrás: Wikipedia)

    Ezek olyan festékek, melyek elég erős lézer fény hatására bomlanak, azaz írás közben a lézer kis lyukakat éget a festékrétegbe (dye). Olvasáskor kisebb intenzitású a lézer és ezért nem bomlik el kiolvasáskor.

    [ Szerkesztve ]

    Eladó: TP-Link 24-es switch, Xbox 360, Daewoo Matiz

  • Ribi

    nagyúr

    válasz Lompos48 #50987 üzenetére

    Én se gondoltam, hogy festékkel vagy hasonló réteggel oldják meg, de végülis 1x írhatónál teljesen érthető. :K
    Újraírhatónál már más kell.

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