LED line in printers

    The LED (LED - from Light Emitting Diode) line is a light source that illuminates the surface of the drum unit in LED printers. At its core, it is an alternative to a laser with an optical scanning system in a classic laser printer and completely replaces its function without changing the technology of electrography.
    The LED line consists of a set of individual light sources - LEDs placed on a textolite board. One inch of an LED line can accommodate 300, 600 or 1200 individual LEDs, which will determine the resolution of the printer in which such an LED line is used.

    Light from the sources passes through lenses collected in 2 rows.

    Lenses are 7 mm segments of optical fiber. Each of these segments conducts light from several sources through itself,

    while the light passes through the lens in a spiral and always falls on a strictly defined place on the drum.

    An important parameter is the correct focal length from the end of the lens to the surface of the drum. If it is not maintained, the image on the printout will be blurred. To ensure the required distance in color LED printers, special precision focusing inserts are used, resting one edge on the surface of the photodrum and the other on an adjusting clown located on the housing of the LED line.

    Due to the design features, LED technology has obvious advantages over conventional laser technology, but more on that next time.

    Sergey Lebedev OKI Marketing Director

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