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History
Optical disc
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An optical disc is a flat, usually disc-shaped object that stores information in the form of physical variations on its surface that can be read with the aid of a beam of light. Optical discs can be reflective, where the light source and detector are on the same side of the disc, or transmissive, where light shines through the disc to be detected on the other side.
The optical lens of a compact disc drive.
The optical lens of a compact disc drive.
LaserCard made by Drexler Technology Corporation.
LaserCard made by Drexler Technology Corporation.
Optical discs are not vulnerable to water.
Optical discs are not vulnerable to water.
An earlier analog optical disc recorded in 1935 for Lichttonorgel [de] (sampling organ)
An earlier analog optical disc recorded in 1935 for Lichttonorgel [de] (sampling organ)
LaserDisc
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The LaserDisc (LD) is a home video format and the first commercial optical disc storage medium, initially licensed, sold and marketed as MCA DiscoVision in the United States in 1978. Its diameter typically spans 30 cm (12 in). Unlike most optical-disc standards, LaserDisc is not fully digital, and instead requires the use of analog video signals.
A LaserDisc held
A LaserDisc held
Used LaserDiscs for sale at a used book store in 2023. The used Laserdisc market as of 2020[update] remains supported by a "loyal following" of "thous
Used LaserDiscs for sale at a used book store in 2023. The used Laserdisc market as of 2020[update] remains supported by a "loyal following" of "thousands". In front is the release of Aladdin and the King of Thieves and the warning notice as the discs are not like vinyl records.
Constant Angular Velocity LaserDisc showing the NTSC field setup and individual scanlines. Each rotation has two such regions.
Constant Angular Velocity LaserDisc showing the NTSC field setup and individual scanlines. Each rotation has two such regions.
A top-loading, Magnavox-brand LaserDisc player with the lid open
A top-loading, Magnavox-brand LaserDisc player with the lid open