Compact Disks (CD)
Optical Disks
9/27/2008
“An optical disk is a compact disk or CD. The formatting of the optical disk will dictate whether it is a DVD, CD, read-only or rewritable. Optical disks have replaced vinyl records, cassette tapes, videotapes and floppy disks.
The
optical
disk became the preferred medium for
music, movies and software programs because of its many advantages. Compact,
lightweight, durable and digital, the optical
disk also provides a minimum of 650
megabytes (MB) of data storage. A double-layered and double-sided DVD
optical
disk holds up to 15.9 gigabytes (GB) of
data.”
http://www.wisegeek.com/what-is-an-optical-disk.htm (9/27/2008)
Warning: Sometimes the older links no longer work. Go to the US Patent number search page, copy the Patent number into the search box and search. For the articles, use your browser to go the Journal site.
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Notes
“The optical disk is so named because its technology is based on light. As the disk spins, a laser beam follows a spiraling trail of pits and lands in the plastic material of the disk. The pits reflect light differently than the lands, while a device translates the reflective difference to bits of "on/off" or 1 and 0. The bits form bytes that carry the digital code of the data stored on the optical disk.
A standard optical disk measures 4.724 inches (120 mm) in diameter and .0472 inches (1.2 mm) in thickness. It is made from polycarbonate with a reflective layer of aluminum, coated in lacquer. The master optical disk is made from glass. Nickel stampers are produced from the glass master and used in an injection-molding machine to "press" or produce multiple copies of the optical disk for distribution. If the disk is double-layered, there will be stampers for each layer, after which the two layers must be bonded together. A double-sided disk requires different stampers for each side, in addition to each layer.
Notwithstanding music, movies and digital photographs, the optical disk is increasingly being used for data storage such as back up and archiving. Instant access to files and the ability to use a built-in DVD player all make the optical disk a superior choice over legacy tape backup units for the average computer user.”
“A blank optical disk can be purchased in many formats. The least expensive will be an audio CD, as these are single-sided, single layered, and not rewritable. DVDs are more expensive, with a double-sided, double-layered optical disk being the most expensive. Before purchasing this type of optical disk, be sure that your DVD player can handle the format. Blank disks are available nearly everywhere music, DVD movies and computers are sold, including discount department stores.”
http://www.wisegeek.com/what-is-an-optical-disk.htm (9/27/2008)
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Reveiw Articles
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US Patents
12/9/2008
7,462,383
Labeling with thermally conductive pads
12/2/2008
7,459,263
Optical recording media with triplet-sensitized isomerization
11/18/2008
7,452,582
Rewritable optical recording medium recording method on the same and optical
disc recording/retrieving apparatus
11/11/2008
7,449,279
Optical information recording medium
7,449,278
Multilayer optical recording medium and storage device
10/28/2008
7,441,653
Package for a disc-shaped digital recording medium
10/21/2008
7,438,547
Optical recording medium and master disc for manufacturing optical recording
medium
7,438,184
Controlled-environment package for limited-play optical disc
10/14/2008
7,435,468
Multi-layer structure and method of drawing microscopic structure therein,
optical disc master and method of fabricating the same using the multi-layer
structure, and optical disc manufactured using the optical disc master
10/7/2008
7,431,973
Optical information recording medium, and manufacturing method, recording
method, and recording apparatus thereof
9/30/2008
7,428,968
Injection molded case for optical storage discs
9/23/2008
7,427,466
Anti-reflection optical data storage disk master
7,427,432
Optical recording medium
7/8/2008
7,396,575
Molding die apparatus, method for disc substrate, and disc-shaped recording
medium
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Journal Articles
11/7/2008
Acridizinium-Substituted Dendrimers As a New
Potential Rewritable Optical Data Storage Material for Blu-ray
(6715 - 6720)
Chemistry of Materials 20 #21 (2008)
Abstract
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Roger D. Corneliussen
Editor
Telephone: 610 883 0055
rcorneliussen@4spe.org
www.maropolymeronline.com
Copyright 2008 by Roger D. Corneliussen