I do n’t know whether the five colors of idioms, colorful, colorful, colorful, are specific. For color laser printers, the five colors are cyan, magenta, yellow, black, and white. Cyan, magenta, yellow, and black are the colors of toner, and white is the background color of paper. Cyan, magenta, and yellow are the ternary colors in the "subtraction principle" of color synthesis. Together with the black and white colors, the colors of the entire world can be formed.
The world was originally colored, but when humans invented an image reproduction method, due to technical reasons, it can only be reflected in black and white, such as photography, film and television, and laser printing. When the technology develops to a certain stage, it will inevitably fully enter the color world, such as photography, film and television. So if someone asks "Do we really need to use color laser printing?", Then I can't help but ask "Does this need a reason?".
Regarding the consumption cost of color laser printing, I believe that color laser printing was a dream in the minds of most users who used black and white laser printing. The reason why they only think of it in a "dream" is probably because of its price. problem.
Speaking of the consumption cost of color laser printing, the test results of the printing cost of ten color laser printers by a foreign testing institution are cited here to best illustrate the problem.
The test conditions are 80% color printing with 20% coverage, and then calculating the total consumption cost. Consumption costs include: toner, fuser, toner cartridge, developing unit consumption and replacement costs.
The types of color printers tested are as follows:
QMSMagicolor DL ​​/ DL +, QMSMagicolor II CX / EX, QMSMagicolor 330CX / EX, HPLJ 4500, HPLJ 8500, LexmarkSC1275, Tek 740N / P, Tek780N / P, Epson C8000, Tek840N
The minimum cost of consumables is $ 5125, the maximum cost is $ 11136, the average cost is $ 7632, and the average cost of the five lowest consumer models is $ 5757. The most interesting one of the test results is that the toner price difference is not directly reflected in the overall printing cost. The printing cost of most color laser printers is very close, and the printing cost of individual models is significantly higher, because The service life of the wearing parts is too short, so although the toner price is low, the overall consumption cost is much higher. This also reminds us that when buying high-end products such as color laser printers, we must pay attention to the cost of consumption when they are used, and don't be fooled by "buying cheaply and using expensive".
Perform an arithmetic operation to convert the above US dollars into Renminbi. We can draw the conclusion that, in addition to the one-time investment of the printer, the total printing cost of 20% coverage can not exceed 6 or 7 cents per page, which has no equivalent effect. One third of the price of inkjet printing, printing more than 10,000 sheets can equal the total investment and the inkjet printer, and then the advantage of the operating cost of color laser printing is clearly reflected. Of course, the high speed of laser printing The effect that can be achieved on plain paper is also unmatched by inkjet printing. According to the load capacity of the network color laser printer design, it can print 10,000 or 20,000 sheets a month. It can also be seen from such usage that color laser printers are suitable for departmental network printing. In fact, color laser printers are mostly network-based.
According to statistics from some domestic (estimated sellers), a color laser printer can print an A4 color photo for only about 1 yuan. If it is extrapolated according to the above foreign test results, an A4 image with a coverage of about 80% will be printed, which consumes all the materials. The cost is about two dollars or more. As a consumer, I would prefer the latter as the budget basis, because it is the data obtained after printing 80,000 pages and calculating all the consumption costs. It is such a conservative data that strongly supports the view that color laser printing is definitely an affordable high-end output method at present, and barriers to widespread use are invested once when purchasing this printer The high cost, so the group is most suitable to use it, and ordinary families can not afford it although they can afford it.
The principle of color laser printing. It is a very interesting thing to understand the principle of color laser printers. It includes a classic example of arrangement and combination. If you are interested, you may wish to count it and see if it can be solved.
The principle of color laser printer is absolutely related to the principle of black and white laser printer. Black and white laser printers use black toner for printing. To understand it simply, a color laser printer uses cyan, magenta, yellow, and black toners to print once, and relies on color mixing to form rich colors.
1. The basic principle of laser printer
Understanding the principle of a black and white laser printer is the basis for understanding color printing, and several image transformations can be used to illustrate its implementation process.
Original displacement map. The raster image processor of the laser printer converts the printed page into a bitmap, which is then converted into an electrical signal and sent to the laser scanning unit.
Bitmap variable charge "negative image" In the laser scanning unit, the image points on the page bitmap are converted into laser signals and emitted to the imaging drum, corresponding to each pixel in the bitmap, and emitted when there is a pixel value The laser beam is not emitted when there is no value. When the laser is emitted, a small irradiation spot is generated on the imaging drum. The imaging drum is charged in advance. The spot irradiated by the laser beam will be discharged, and the unirradiated spot is still charged. After this process, the page position The image is converted into a "negative image" of the charge on the imaging drum.
The "negative image" of the charge becomes a "positive image" of the toner. The toner has the same charge as the imaging drum. When the imaging drum rotates, when the "negative image" of the charge passes through the developing roller, the discharged point will attract the charged The toner, but the undischarged dots do not absorb the toner due to the same-sex repulsion, so that the "negative image" of the charge becomes the "positive image" of the toner.
The "right image" of the toner becomes a bitmap on the paper, and the transfer drum rotates with the imaging drum. When the charged paper passes through the transfer drum, the toner is attracted to the paper and becomes a printed image. Because the toner is easy to fall off, the printing paper also passes through a heating roller to make the toner tightly adsorb on the paper.
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