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The history of optical recording can be divided into a few number of distinct major contributions. The pioneers of optical recording worked mostly independently, and their solutions to the many technical challenges have very distinctive features, such as *reflective disc (Compaan and Kramer) *transparent disc (Gregg) *floppy disc (Russell) *rigid disc (Compaan and Kramer) *focused laser beam for read-out through transparent substrate (Compaan and Kramer). ==Gregg 1958== Laserdisc technology, using a transparent disc,〔 Transparent recording disc, 1969.〕 was invented by David Paul Gregg in 1958 (and patented in 1961 and 1990).〔 Video signal transducer, 1970.〕〔 Disc-shaped member, 1990.〕 By 1969 Philips had developed a videodisc in reflective mode, which has great advantages over the transparent mode. MCA and Philips decided to join their efforts. They first publicly demonstrated the videodisc in 1972. Laserdisc was first available on the market, in Atlanta, on December 15, 1978, two years after the VHS VCR and four years before the CD, which is based on Laserdisc technology. Philips produced the players and MCA the discs. The Philips/MCA cooperation was not successful, and discontinued after a few years. Several of the scientists responsible for the early research (John Winslow, Richard Wilkinson and Ray Dakin) founded Optical Disc Corporation (now ODC Nimbus). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Optical recording」の詳細全文を読む スポンサード リンク
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