Today, CDs are such commonplace objects, a lot of us cannot even remember a time when they did not exist. But behind these ordinary-looking discs is a long good reputation for development along with a production process determined by ingenious technology that’s the way in front of its once again time.
Making a CD
The technique of CD creation begins with a single master disc. This original disc is made of glass and is also meant to withstand the pressures of replication. This disc is cleaned with deionized water plus a fine brush, then it’s left to dry before photo resistant chemicals are spread on its surface.
After these procedures, the master disc is placed in a machine that will engrave data onto it. Coatings of nickel and vanadium are applied to get a die.
This die will probably be used to make copies in the master disc.
The plastic CDs are made utilizing a hydraulic press. Polycarbonate plastic granules pass into the preheated press until it liquefies. The plastic might be injected into the die to make a translucent disc. This disc is then left for cooling before plastic hardens.
After the master CD is replicated, a thin coating of aluminum is applied to the copies. This means that the information for the discs might be read. A coat of varnish can also be put on to protect the discs against scratches.
Once the varnish dries, silkscreen engraving might be printed for the surface in the discs. The discs are packaged and provided for the marketplace.
How the CD began
The first music CDs were invented in 1965 when inventor James Russell thought of storing information in a light-sensitive plate instead of the black vinyl hole-punched discs which are used to store music then. His product was patented in 1970 – though the idea was too advanced for his time, also it failed to sell.
However, in the 1970s, Sony and Philips got interested in the idea and bought licenses from Russell. In September 1976, Sony made its first public demonstration from the optical digital audio disc, while Philips first displayed its product on March 8, 1979.
With these electronic giants supporting it, the CD market potential was immediately realized. To accelerate the introduction of a marketable version of the CD, Sony and Philips chose to work together to put the standards with the compact disk and it is played.
It took 12 months of trial and error prior to the first commercial disc arrived. The Laserdisc – a 30cm version in the CD to be sure it now – took over as the blueprint for that 12cm cd’s manufacturing process. Philips worked on prolonging the compact disk’s playing time and improve its resistance to scratching. Meanwhile, Sony created a player that would see the discs.
In 1982, Billy Joel’s 52nd Street had become the first album to be sold in CD format. Three years later, Dire Straight’s Brother’s in Arms became the first CD album to sell more than the usual million pieces.
The compact disk then continued beyond its original function of storing and playing high-quality music. It took over as a medium for holding software. As early as 1990, it became possible to write computer data on a compact disc.
Soon, the CDs’ effects on magnetic storage devices such as cassettes and VCDs became felt. Ten years after CDs became rewritable, cassette tapes disappeared from the market industry almost completely.
Today, CD manufacturers are thinking about creating even more scratch-resistant CDs that will hold often more data than our current CDs. With the improving technologies on CD production and CD replication, there is not any telling what this shiny little plastic device has in store for us. But one thing’s for sure: it would be worth expecting.