Technology. Presented By: Shyam K. History of Compact Digital Media. 1980: The first Compact Disk player is produced by Sony/Phillips. 1982: The first Compact Disk is manufactured for sale, Billy Joel’s “52 nd Street”
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1980: The firstCompact Disk player is produced by Sony/Phillips.
1982: The first Compact Disk is manufactured for sale, Billy Joel’s “52nd Street”
1984: First portable Compact Disk players enter the market followed by car CD players shortly after.
1985: Sony/Philips announce the standard for compact disc storage of computer data, the CD-ROM
1987: Video CD format is designed.
1991: CD-R (Compact Disk Recordable) technology is introduced as a new storage technology.
1996: Digital Versatile Disk(DVD) technology is introduced
1997: DVD’s and DVD players begin to enter the market
1998: DVD Recordable systems invented and begin to enter the market
2000: DVD movies become mainstream and replace analog VHS as the format of choice.
DVD construction is similar to traditional CD-ROM construction with a few added steps, and a much higher degree of manufacturing tolerance required.
Analog signal is converted to a digital signal and compressed using DVD compression standards, then stored for transfer onto the DVD.
A glass base is coated with light-sensitive photoresist, which is then developed in a sodium silicate solution, using a laser to implant the digital signal
Nickel is evaporated on the surface of the master, providing a conductive layer for the electroplating phase.
A wet process in which the master is bathed in nickel sulfamate and a stamper is applied to create the pattern required for multiple disc replication.
The previously created master is used as a base, giving a pattern pressed onto an injection molded polycarbonate substrate.
Similar to semiconductor sputtering, a metal layer is formed on the surface, aluminum for single layer, gold or silicon carbide for dual layer discs.
Multiple layers are bonded together using either hot melt or ultraviolet processes. This bonding requires extreme precision to prevent the DVD from becoming unbalanced
The optical system is made up of a laser, photodetector, prism, mirrors, and lenses. The laser and photodetector are installed on a plastic housing, and the other components are placed in specific places. Great care is taken in the positioning of each of these pieces because without proper alignment, the system will not perform properly.
Disc drive mechanism
The optical system is attached to the motor that will drive it. This in turn is connected to the other principle parts of the disk drive including the loading tray and the spindle motor. Other gears and belts are attached and the entire assembly is placed in the main body.
Printed Circuit Board
The electronic components of the DVD machine are sophisticated and use the latest in electronic processing technology. The circuit board is produced much like that of other electronic equipment.
DVD-ROM. High-capacity, high-throughput, read-only optical disc that can be used as a general-purpose computer storage device. This application is currently the most prevalent, with disc storage ranging from 4.7 to 17.0 GB, depending on format.
DVD-Video. High capacity, high throughputread-only optical disc that can be used for the interactive playback of high quality video, audio and graphic content. This application, similarly uses disc storage ranging from 4.7 to 17.0 GB, depending on the format.
DVD-Audio. Similar to the DVD-Video, differing only in the compression and storage of audio, rather than video.
DVD-R. High capacity, high throughput, write once, optical disc used as a general-purpose computer storage device. This application currently is formatted to hold 3.8 GB of storage per side, although current advances promise to achieve 4.7 GB per side.
DVD-RAM. High capacity, high throughput, read-write, used as a highly versatile storage medium for computers and other devices. This application currently uses its own format, allowing 2.6 GB of storage per side.
DVD vs BLU-RAY Technology