The course of developing Digital Video Disc

Abstract

A Digital Video Disc (DVD) is expected to play a significant role in the coming multimedia era. In the beginning of developing a high density optical disc applicable to a DVD, basic factors of an optical disc are reconsidered free from accepted idea to prove the ideal figure. First of all disc thickness was reconsidered and optimized to choose 0.6 mm1). That is because a higher NA objective lens can be used without increasing of aberration caused by disc tilt. A high efficiency data format suitable for 0.6 mm discs has been also developed. As the result a DVD having 5 GB of user capacity in CD size has been achieved. This DVD can contains more than 140 minutes of video signal with the same quality as the conventional analogue video discs.