Need a laymen's explanation on dvd dyeing process

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Need a laymen's explanation on dvd dyeing process

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customguy

Junior Member

20. January 2006 @ 06:09

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I know that dvd blanks have recording dyes instead of the silver bottoms on originals. My question is how do the movie studios record data on a disc without that dye? Are originals stamped or pressed without the need for it. Will there ever be silver bottom blanks?

-Keith

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teflonmyk

Senior Member

20. January 2006 @ 06:17

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You are already on track. Originals are stamped/pressed...

EDIT:

good link here

http://www.dub-it.com/dvd/howmade/

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This message has been edited since posting. Last time this message was edited on 20. January 2006 @ 06:21

BurningAs

Senior Member

1 product review

20. January 2006 @ 17:48

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yeah dude wats with this.

i remeber CD-R just came out they were all blue, while regular studio CDs were silver and as time progress, i.e.-now they are all silver!

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JoeRyan

Senior Member

7. March 2006 @ 04:53

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Movie DVDs and music CDs are polycarbonate discs with billions of tiny pits molded into them to represent digital data. A laser reads the discs by having its light bounced back from a thin aluminum mirror layer: when the light runs over the edge of a pit, the reflection changes, and that means the digital equivalent of a "one." (It's a bit more complicated than that, but in simple terms that's a reasonable explanation.)

Recordable discs have no pits, just a wobbled groove for the laser to track and a dye that reacts with the heat from a recording laser to darken and act as a "pit." The mirror layers are silver, silver alloy, or gold because the dyes are corrosive to aluminum. The color of the disc is a combination of light passing through the dye and bouncing back from the mirror layer. The original CD-Rs were dark blue cyanine dye; now a yellowish-green phthalocyanine dye is more common, and that can be made to disappear altogether by slightly coloring other elements in the disc to filter out the reflected colors. DVDs use a smaller wavelength laser, and the dye that reacts best with it is more towards the purple end of the color spectrum. Rewritable discs use semi-metal alloys with either aluminum or silver alloy mirror layers; so they end up all looking the same (except for DVD-RAM whose address system is visible in the hash marks molded into the disc.)

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