When was the invention of the compact disk?

The compact disc is a spin-off of the much less successful Laserdisc technology. In 1979, Sony and Philips Consumer Electronics set up a joint task force of engineers to design a new digital audio disc. The task force, led by prominent members Kees Schouhamer Immink and Toshitada Doi, progressed the research into laser technology and optical discs that had been started by Philips in 1977.