LightScribe
From Wikipedia, the free encyclopedia
LightScribe is an optical disc recording technology that utilizes specially coated recordable CD and DVD media to produce laser-etched labels with text or graphics, as opposed to stick-on labels and printable discs.
The LightScribe method uses the laser similar to the way that data is burned to the disc; a greyscale image of the label is etched to the top side of the disc. The discs come in many colors: monotone (the original), red, green, blue, yellow, and orange backgrounds.
The purpose of LightScribe is to allow users to create direct-to-disc labels (as opposed to stick-on labels), using their optical disc writer. Special discs and a compatible disc writer are required. Before or after burning data to the read-side of the disc, the user simply turns the medium over and inserts it with the label side down. The drive's laser then etches into the label side in such a way that an image is produced (see below).
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[edit] History
LightScribe is a registered trademark of the Hewlett-Packard Development Company, L.P. LightScribe was conceived by HP engineer Daryl Anderson[1] and brought to market through the joint design efforts of HP's imaging and optical storage divisions.[2]
[edit] Mode of operation
The surface of a LightScribe disc is coated with a reactive dye that changes color when it absorbs 780nm infrared laser light. The etched label will show no noticeable fading under exposure to indoor lighting for at least 2 years. Optical media should always be stored in a protective sleeve or case that keeps the data content in the dark and safe from scratches. If stored this way, the label should last the life of the disc in real-world application.
LightScribe labels burn in concentric circles, moving outward from the center of the disc. Images with the largest diameters will take longest to burn.
Initially LightScribe was monochromatic, a grey etch on a gold looking surface. From late 2006, LightScribe discs are also available in colors. The "burning" is still monochromatic, but the backgrounds can now be produced in various colors, under the v1.2 specification.
Currently it's not possible to replace a LightScribe label with a new design, but it is possible to add more content to a label that is already burned.
The center of every LightScribe disc has a special code that allows the drive to know the precise rotational position of the disc. This in combination with the drive hardware allows it to know the precise position from the center outwards, and the disc can be labeled while spinning at high speed using these references. It also serves a secondary purpose: The same disc can be labeled with the same label again, several times. Each successive labeling will darken the blacks and generally produce a better image, and the successive burns will register up perfectly. However, using the Control Panel to modify the printing parameters will give images with higher contrast.
[edit] Drawbacks
Special storage precautions are necessary to prevent LightScribe discs from fading. The official recommendations are to "keep discs away from extreme heat, humidity and direct sunlight", "store them in a cool, dark place", "use polypropylene disc sleeves rather than PVC sleeves", and to protect them from "residual chemicals on your fingers (that) could cause discoloration of the label image". Such chemicals include common hand lotions and hair care products.[3] Users not observing these precautions have reported LightScribe discs to become visibly faded within two months in the worst case. This drawback makes the technology unsuitable for applications involving continuous handling, and for such popular uses as car music compilation disks which typically have unavoidable high exposure. Since many disc players present internal temperatures significantly higher than room temperature, LightScribe discs should also not be left in disc players for long periods of time.
Lightscribe discs may form a visible white powder coating. This is due to crystallization of some of the label-side coating. It is not harmful and can easily be removed with a water-dampened cloth. Wiping the disc with a damp cloth does not harm the inscribed label.[4] Up to now, LightScribe Support has not explained which conditions lead to this reaction, and the precautions that can be taken to avoid it.
Finally, burning Lightscribe labels is considerably slower than actually recording a CD or DVD. The average burn time for a cover is approximately 20 minutes, making it a longer process than burning the disc data itself.
[edit] References
- ^ HP Online classes - Getting started with LightScribe
- ^ HP LightScribe - frequently asked questions
- ^ LightScribe.com: Support: FAQ: Burning a Label
- ^ LightScribe.com: Support: FAQ: Support and System Software
[edit] See also
- LabelFlash, a similar but incompatible technology
- DiscT@2
- U.S. Patent 7,172,991 -- "Integrated CD/DVD recording and labeling", Daryl E. Anderson, Makarand P Gore, Paul J McClellan, Hewlett-Packard Development Company
