Lasers, jets and dots
The technologies behind the two main forms of printers are not only fascinating, but indicate where each technology fits within the office. Good quality inkjets may play some kind of role, particularly for photographs, but it’s laser printers that make up the lion’s share of business printers.
The reason why laser printers are so suited to businesses comes down to how they handle text printing, and how they cope with quantity. In a nutshell, laser printers work by using a laser (or, more recently, LEDs) to magnetically ‘draw’ the image on a rotating, statically-charged printing drum. Toner is then applied to the magnetised parts on the drum, which subsequently prints the image on the page. The process is very fast, particularly for black and white documents, and more importantly, the process is more cost efficient than inkjets (more on that later).
Not only do laser printers handle high volumes, they also excel at producing text documents. This comes down to the toner being ‘fused’ to the page, rather than being absorbed by the paper. This latter method is used by inkjet printers, which can result in a slight ‘bleed’ around finely detailed elements like text. As inkjet printers continue to evolve, these discrepancies are becoming less distinct.
Despite the relative inferiority of inkjet printers when it comes to text and speed, the technology is well suited to high quality colour printing. Various paper types and ink ranges mean you can produce high-gloss, professional photos with comparatively cheap domestic grade printers. But where inkjets can play a role in the home or in niche business situations, it shouldn’t be used simply because your require colour in your documents – for that, a colour laser will likely suffice.
Common to all printers, however, are two (sometimes poorly explained) specifications: the printer’s resolution and its page-per-minute rating. The resolution, measured in dots-per-inch (DPI) is like the resolution on a monitor or TV, where the higher the resolution, the more detail can be squeezed onto the page – and similarly, a high resolution can be overkill where the detail is not needed. Some manufacturers use special resolution ‘enhancement’ techniques to increase the resolution beyond that of the image being printed. The other key specification is the pages-per-minute, which is a nominal, manufacturer-specified figure that’s usually quoted for colour and mono pages. The observed PPM rating can vary wildly from the quoted spec, so always look for independent tests like those found at PC Authority Business.
Thinking about printing
By Ed Dawson on May 1, 2007 3:36PM
Page 2 of 4 | Single page