OKI experts to China sermon: a good LED print!

Printer in circles, OKI is only used LED technology to manufacture a page printer manufacturer (page printer or printer page description, also include laser printers), so it is in the LED printing technology has the strongest voice. But due to the popularity of LED printing rate than laser printers, many of the LED printing technology is not well understood, in order to eliminate people's doubts, days before the OKI Institute, image media LED technology research expert Yamamoto Matsuo came to China to preach.

Light emitting film

LED print hair exhibition history

Print speed and print contrast resolution relationship according to Yamamoto Matsuo introduction, generally before 2006, LED printer uses digital LED printing head, printing quality is equivalent to a laser printer, double level printing based on the print resolution increased from 300dpi, 600dpi to 1200dpi, the printing speed from above 8ppm to greater than 30ppm; 2006 after using EFB LED print head (EFB, Epi-Film, Bonding) print quality can go beyond the laser printer, based on multilevel printing, print resolution of real 1200dpi, the printing speed gradually towards 60ppm. The birth of EFB LED print head is a key node, it makes the LED print head has a breakthrough in print resolution and manufacturing cost. LED film is a compound semiconductor, very thin, commonly used materials are potassium arsenic, arsenic is highly toxic, the film must be generated when the substrate generated after film stripping from the substrate, and then paste the luminous film tightly pasted on the IC chip, then the light emitting film strip through erosion cutting process into a LED luminous point, finally the metal wiring. In the process of using EFB technology to create the print head, it is the most difficult to make the film with the IC film, OKI uses a new technology, the use of binding force between the two molecules will be closely linked. The stripping process is also very complex, in which only 2 microns thin substrate can be reused, with the increase in production, which is also conducive to the reduction of production costs. LED printer compared to laser printers, rotary motor less movement, no optical lens assembly complex, more simple and compact structure, easy for miniaturization, high reliability, LED print head has from 2000 the first generation of 205cm3 and 170g reduced to the current fourth generation (EFB LED) 33g 50g. LED printer technology can easily achieve a balance between resolution and color depth, it adopts multilevel image enhancement technology, can change each LED light source on the length of time, in order to form a half tone dot matrix multistage LED units with different brightness levels, currently has 64 gray level; while the laser printer is still a dual level control, provide lattice with 100% and 0% brightness, to generate halftone dot matrix polymerization unit, which must be interdependent in the resolution and color depth. In the EFB technology, the further reduction of the metal wiring, print resolution will not increase the cost of the print head, and laser printing to enhance the resolution will bring a lot of pressure on the printing components. With the increase of printing speed, the resolution of laser printing will be reduced, while the resolution of LED printing will not be affected. In addition, LED print point size has been reduced to 25 micron resolution, can be easily increased to 2400dpi, the future of the Blu ray is up to 4800dpi, and the laser print point size is the smallest is up to 55 micron, such as the blue light, is difficult to further enhance the resolution, or to design and cost of optical components, motor etc. bring grim challenge.

Source: computer world