The principle and application of color laser printer (Part 1)
I don't know whether the five colors in the idiom colorful, colorful and colorful are specific. For color laser printer, the five colors are blue, magenta, yellow, black and white respectively. Blue, 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 black and white, they can form the color of the whole world
the world is originally color, but at the beginning of human invention of 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 definitely enter the color world, such as photography, film and television. So if someone asks, "is it really necessary for us to use color laser printing?", Then I can't help asking, "does this need a reason?"
as for the consumption cost of color laser printing, I believe that color laser printing was once a dream in the eyes of the vast majority of users who used black-and-white laser printing. I'm afraid the reason why I only think of it in "dream" is mainly because of its price
when it comes to the consumption cost of excellent laser printing with the use of various new materials, the test results of a foreign testing institution on the printing cost of ten color laser printers can best illustrate the problem
the test condition is to print 80000 pages of color with 20% coverage, and then calculate the total consumption cost. The consumption cost includes the consumption and replacement cost of toner, fuser, toner drum and developing unit
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 thing about the test results is that the price difference of toner is not directly reflected in the overall printing cost. The printing cost of most color laser printers is very close. The mainland strongholds of individual models include Nanjing, Shanghai and Chongqing; Among them, BASF Asia Pacific Innovation Park in Shanghai is a key R & D center in the Asia Pacific region. The printing cost is significantly higher because the service life of its vulnerable parts is too short. Therefore, despite the low price of toner, 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 consumption cost when using them, and don't be fooled by "buying cheap and using expensive"
perform an arithmetic operation and convert the above US dollars into RMB. We can conclude that in addition to the one-time input of the printer, the total printing cost of 20% coverage can not exceed 60 or 70 cents per page, less than one third of the price of inkjet printing with the same effect. Printing more than 10000 copies can make the total input equal to that of inkjet printers, After that, the advantage of the running cost of color laser printing is clearly reflected. Of course, the high speed of laser printing and the effect that can be achieved on ordinary paper are also unparalleled by inkjet printing. According to the load capacity designed by the network color laser printer, 10000 or 20000 copies can be printed in a month. It can also be seen from such usage that color laser printers are suitable for department network printing, but in fact, color laser printers are also mostly network type
according to the statistics of some people in China (estimated to be sellers), it only costs about 1 yuan to print an A4 size color photo with a color laser printer. If you print an A4 picture with a coverage of about 80% according to the above foreign test results, the total cost of materials consumed is about more than 2 yuan. As a consumer, I prefer the latter as the budget basis, because it is the data obtained after printing 80000 pages and calculating all consumption costs. Such a seemingly conservative data also strongly supports the view that color laser printing is absolutely an affordable high-end output mode at present. The obstacle to its wide application is the high cost of one-time investment when buying this printer, so it is most suitable for the group to use it, while ordinary families can't afford it although they can afford it
brief introduction to the principle of color laser printing. It is interesting to understand the principle of color laser printer, which includes a classic example of permutation and combination. If you are interested, you can calculate it to see if you can solve it
the principle of color laser SAMPE Beijing Branch printer is absolutely related to the principle of black-and-white laser printer. Black and white laser printers use black toner to print. Simply understand, the color laser printer uses cyan, magenta, yellow and black toners to print once respectively, and relies on color mixing to form rich colors
1. Basic principle of laser printer
understanding the principle of black-and-white laser printer is the basis for understanding color printing. Several image transformations can be used to explain its implementation process
raw Bayer materials technology today announced the launch of a new generation of polyurethane (PU) coated fabrics for the textile industry, a new overall solution - insqin brand draft bitmap. The raster image processor of the laser printer changes the printed page into a bitmap, and then converts it into an electrical signal and sends it 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 transmitted to the imaging drum. Corresponding to each pixel point in the bitmap, the laser beam is emitted when there is a pixel value, and is not emitted when there is no value. When the laser is emitted, a small irradiation point is generated on the imaging drum. The imaging drum is charged in advance. The points irradiated by the laser beam will be discharged, and the points not irradiated will still be charged. Through this process, the page bitmap will be converted into the charge "negative image" on the imaging drum
charge "negative image" becomes toner "positive image" toner has the same property of charge as that on the imaging drum. The imaging drum rotates. When the charge "negative image" passes through the developing roller, the discharged point will absorb the charged toner, while the non discharged point will not absorb the toner due to the same repulsion, so the charge "negative image" is changed into toner "positive image"
the toner "positive image" turns into a bitmap on paper, and the transfer drum rotates with the imaging drum. When the charged paper passes through the transfer drum, the toner is adsorbed on the paper to become a printed image. Because the toner is easy to fall off, the printing paper also needs to pass through a heating roller to make the toner closely adsorb on the paper
(to be continued)