3. Disc Materials

1)CD-ROM disc

It is composed of Silver _ colored aluminum plate and Reflective layer.

Groove (Pit) of aluminum plate make a track.

Laser wavelength : 780 nm, Laser Power (Read): 0.5mW

Signal is detected by the difference of reflective beam

intensity between “pit” and “Land” on the disc.

Label Printing

Protective Layer

Reflective Layer

Substrate (Polycarbonate)

Pit

Laser Beam

2)CD-R disc

It is so-called WORM (Write Once Read Many) CD.

It is composed of polycarbonate layer, Organic dye layer, Reflective layer, and Protective layer.Gold/Silver Reflective layer is used to enhance the reflectivity

According to the kinds of Organic dye layer, it is divided by Green CD, Gold CD, Blue CD.

Laser Wavelength : 780 nm, Laser Power (read) : 0.7 mW

Recording Power : 8x(14~20mW), 16x(25~35mW)

When some part of dye layer is exposed to laser heat, it’s color changs black.Therefore, writing and reading is enabled by the difference of reflectivity between changed part and unchanged part.

Polycarbonate layer has Pre_Groove which make a Track.

 

Pigment

Reflective Layer

Color

 

 

 

 

 

Phtalocyanine

Gold/Silver

Yellow/White

 

 

 

 

 

Cyanine

Gold/Silver

Dark Green/Bright Green

 

 

 

 

 

Azo

Gold/Silver

Dark Blue

 

 

 

 

 

 

 

 

 

 

 

 

Label Printing

Protective Layer

Reflective Layer

Organic Dye Layer

Substrate (Polycarbonate)

Laser Beam

Groove

21

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LG Electronics GSA-4167B, GSA-4168B, GSA-4165B Disc Materials, CD-ROM disc, CD-R disc, Pigment Reflective Layer Color

GSA-4167B, GSA-4165B, GSA-4168B specifications

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The LG GSA-4167B stands out for its versatility and performance. This model supports a wide range of disc formats, including DVD-R, DVD+R, DVD-RW, DVD+RW, and dual-layer DVDs, enhancing its usability for various applications. With a generous writing speed of up to 16x for DVD+R and 8x for dual-layer DVDs, users can create and backup data efficiently. This device is equipped with LG’s Super Multi technology which allows it to read and write multiple formats, making it a perfect choice for users who wish to maximize their media experience without being restricted to a single format.

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