Normal CD manufacturing procedure:

1. Laser to glass to engrave data

2. Glass galvanic (metalizing Nickel ) to make stamper

3. Stamper install to molding machine and make CD by polycarbonate

 

Signal loss (pit land deform) during metalizating Nickel on glass and molding process

Also polycarbonate light transmission and disking , making CD player not easy to read the data

 

Glass CD : direct laser to glass , no any loss

Also glass light transmission is excellent and absolutely flat

CD player is easy to read

Normal CD

Glass CD

Glass CD manufacturing procedure:

Only one step:  direct laser to glass , almost no any loss

 

Also glass light transmission is excellent and absolutely flat

CD player is easy to read

 

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Knowledge of CD data base