Question

Draw neat labelled constructional diagram of INKJET printer. Describe the function of each block. State two advantages.

Answer 1

It is a non-impact printer. It provides letter quality printout than dot matrix printer. Its output is sharper than Dot matrix though its output quality is not to the same level of laser printer & it is cost is less than Laser printer. In inkjet printer, ink is emitted from nozzles as they pass over the media. A print head scans the page in horizontal strips, using a motor assembly rolls the paper in vertical steps. A strip of image is printed, then the page moves on, ready for the next strip. To speed up things the print head doesn’t print just a single row of pixel in each pass but a vertical row of pixels at a time. 

OR

Principle: Conductive ink is forced through a very small nozzle to produce a high-speed stream or jet of drops of inks. The size and spacing of these drops are made constant by vibrating, the nozzle compartment at an ultrasonic frequency with a piezo crystal mounted at one end of the cavity. The vibrating frequency is around 100 KHz; the drop diameter is 0.06mm and the spacing 0.15mm. Each drop of ink after leaving the cavity is given a specific amount of electrical charge as it passes through a charging electrode structure, which is located at the point at which the stream breaks up into drops. The drops are deflected vertically by a second electrode structure and strike the printing structure. The amount of deflection is determined by the charge originally imparted to the drop. With no charge imparted there is no deflection. 

Advantages: They are silent in operation when compared to impact printers. It produces an output, which is compatible in quality to that of a laser printer. Faster when compared to Dot Matrix printers.