Physical Structure
The shape size of the CD-R disc is exactly the same as the CD-ROM disc, but the structure is different from the latter three-layer structure, and the CD-R disc uses four-layer structure. Form: The underlying layer is a polycarbonate transparent plastic injection molded disc, plated with a thin layer of organic dye recording layer on the substrate, and a reflective layer is made of a corrosion-resistant gold film, and the top layer is a painted protective layer. Some CD-R discs are coated with a fifth layer printing layer over the paint protective layer, and the user can be printed directly on the back surface of the CD-R optical disk using an inkjet printer, or a soft pen is labeled. The organic dye in the
CD-R optical disk recording layer has a strong absorption of the wavelength of 780 nm, and when the wavelength is 780 nm output, the focused laser beam is irradiated in the organic dye recording layer. The organic dye at the spot will absorb a lot of energy and instantly convert the absorbed energy into heat, generate high temperatures of 250 to 400 in the micro-region, so that the organic dye is solved, in the plastic disc and reflective layer A micropore is formed to make the following reflective layers completely exposed to form an information pit similar to a molded CD-ROM disc. When burning the CD-R disc, the CD-R disc rotates with a constant line speed, and the power-adjustable laser beam burn a series of different lengths of micropores in a series of different lengths of different lengths of different lengths along the spiral predecessor slot to achieve the correct write of recorded data. enter. Since the micropores of the organic dye recording layer have strong light reflection characteristics, the reflectance of the unmelted gasification is very low, so the micropores and unmelted organic dyes on the CD-R disc have a CD-ROM. The surface and pits on the optical discs are the same optical reflection characteristics. Data read can be performed using a CD-ROM drive. The pits that are ablated on the CD-R disc is irreversible, that is, it is impossible to restore the burned CD-R disc recoverable to the original state, so the CD-R disc can only be disposed. Write. As long as the CD-R disc does not suffer from corrosion and physical deformation, the pit physical form on which the pit is not changed, and the pit information can be permanently stored. That is, the information recorded above can be preserved permanently.
CD pits and non-pit structures on disk to store 0, 1 code, where 1
classification
The CD-R blank disc on the market mainly has three types of green disks, gold plates and blue trays. They mainly distinguish between three different colors of organic dyes, thereby exhibiting different colors. From the principle of data records and reading, they all have the same functionality.
Green Disk
The green plate is the first CD-R disc that produces and produces production, which uses a bruises invented by the Japanese Sun Lunar Company. Since the CD-R standard is based on the floral green dyes, all recorders are designated according to the recorded characteristics of the recording sensitivity, record thresholds, and reflectivity, and all recorders are designed according to the orange paper specifications, so the green dish is for various recorders. Strong compatibility.
The green dish is used in the green dish, the record sensitivity is high, and various recorders can quickly form a reliable information pit in the recording layer. However, the problem that follows is that the green dish is too sensitive to glare, for example, under the exposure of sunlight at noon in summer, the flowers of flowers will be scrapped in the CD. In order to reduce the sensitivity of green disks, some CD-R green plate manufacturers, add not easy-to-sensuous materials in the flowers green dyes, as a result, the color of the flowers and green dyes, the color of the disk is close to the gold disk, this The CD-R disc is also known as a golden glass.
Gold drive
For the disadvantage of broth to strong light, Sanjing company has developed a phthalum blue dye. The phthalosputs itself is pale yellow, and the recording of the disc is golden after mixing with the golden color of the reflective layer, so this disc is referred to as a gold disk. The phthalosputum green dye has high stability, and is not sensitive to indoor and outdoor glare. However, the write laser power required by the gold disk on the recorder is high, and the write laser power of the phthalum blue dye is usually 6.5 (± 0.5) MW, while the green dish is only 5.5 (± 1.0) MW.
Blue Pan
In order to reduce the cost of CD-R green disks and gold disk, Mitsubishi Chemical Company has developed production of a metallized AZO organic dye, and the cost is low. Silver reflective layer material. The AZO itself is dark blue, so the recording surface of the CD-R disc is blue after mixing with the silver white color of the reflective layer, and therefore is called a blue disk.
Shopping guide
In general, the CD-R gold disk has the longest service life, more than 100 years, suitable for reliable long-term preservation data. The CD-R standard is based on the green dish. It has a lower write power and a wide power range, which reduces the requirements of the burner written to laser power, improve compatibility with the recorder.
We can see a wide variety of CD-R discs, with a piece of space, with a single piece. Which of the choice? You can decide according to your own economic ability. The price of bulk is more than 5 yuan, while the single-piece box is more than ten yuan. For important data materials and want to save time, you can choose high-end gold disk or brand-name manufacturers, while usually use, bulk green disks is enough. To store multimedia image data and various raw data, using CD-R CDs is the best choice. CD-R discs can be read on ordinary CD-ROMs, compatibility is very strong; and the CD-RW disk is not necessarily possible. When burning a CD-R disc, it is best to close other applications, such as screen saver, viral monitor, media automatic playback, etc. Do not run other programs while burning, if necessary, you should disconnect the network to avoid the phenomenon of engraving bad discs due to interference. If the disc is broken when burning, you can try to perform the shutdown function of the burning software. If you are successful, you can continue to use; if you don't successfully change the new version of the burning software or another burning software to try it. Sometimes use Easy CD Creator3.5 engraved discs, you can use 4.0 rescue. In addition, you can try a brand recorder.
The burned CD-R disc needs to be kept safe. Since the CD-R disc does not withstand high temperature and sunlight, it is easier to damage, avoiding the sun irradiation when saving, not allowing it to be bent and squeezed. Everyone knows how to protect the data surface to protect the disc is used to use the ordinary CD CD, do not touch your hands, don't use hard objects. The same is true for the CD-R disc, but the data "storage position" of the CD-R disc is relatively close to the label surface, and the scratches of the label surface are more easily injured. When using it as much as possible to protect the tagface, therefore, when you numbered, use a soft pen to write, not using a fountain pen, etc., so as not to damage the data.