How Your Laser Printer Prints

In 1969, a researcher called Gary Starkweather invented the laser printer. He modified a xerographic copier to create a functioning prototype by 1972. The initially printers conveniently filled a area. Technology improved over time, together with pricing and size.

Now it’s simple to receive a inexpensive machine that will print almost anything. Regarding size, businesses creating desktop printers frequently for small footprints – there are even mobile printers. The seven-step xerographic procedure summarized below – though extremely streamlined and featuring an growing range of innovation and information updates – has, though, stayed fundamentally the same.

Raster Image Processing: The Raster Image Processor (RIP) is the mind of the printer, turning the image you wish printed into a bitmap. It does this by utilizing a page description code to encode the image in a means that the machine may ‘understand’. A page is created up of horizontal lines of dots, called scan lines or raster lines. This information is stored as a bitmap in the RIP’s memory. A color image needs 4 bitmaps, related to each of the CMYK (cyan, magenta, yellow and black) toner levels.

Step Two – Charging: A damaging electrostatic charge is projected across the surface of the photoreceptor. The photoreceptor is a revolving drum or belt that holds this charge while in darkness. In additional words, when charged, the drum is a lot like a roll of movie waiting to be exposed to light – in this case, a laser beam.

Step Three – Exposing: The laser is aimed at a program of mirrors and lenses that bounces it exactly onto the revolving drum. The rasterized information in memory switches the beam on and off to shape the dots of every scan line. The beam affects the damaging charge which has been used to the drum, neutralizing or reversing the polarity of the charge wherever it touches, i. E., it ‘cuts out’ the ‘to-be-printed’ components. In this method, the bitmap is used to the drum as a static electrical damaging image. Lasers are utilized as a result of the uniformly narrow beam they generate. Many printers that are incorrectly termed ‘laser’ expose utilizing page-width spanning LEDs instead of a laser.

Developing: This static electrical ‘cut out’ is then exposed to toner – carbon black (or different colorant) mixed with fine particles of dry wax- or plastic powder. The toner’s particles are negatively charged. As these, they ‘stick’ to the positive/neutral pieces produced by the laser and never follow the negatively-charged pieces.

Transferring: The drum or belt is pushed or rolled onto a page, which transfers the toner to the surface of the paper.

Fusing (Step 6): The sheet goes into a fuser assembly, where stress and heat bonds the toner to the page.

Step Seven – Cleaning: Once the print is performed, a soft plastic blade (electrically neutral) cleans any remaining toner within the drum into the waste reservoir along with a discharge lamp removes any remaining charge within the drum.

These methods happen in these fast succession that the procedure may happen before the drum completes 1 revolution – this alone is amazing. Color printers utilize many laser scanner assemblies – a true marvel of contemporary innovation. The upcoming time you print out a document or pic, take a minute to appreciate the great complexity of the laser printer.

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