Inkjet printing | Nilkamal

 Inkjet printing is a type of computer printing that recreates a digital image by propelling droplets of ink onto paper and plastic substrates.[1] Inkjet printers are the most commonly used type of printer,[2] and range from small inexpensive consumer models to expensive professional machines.

The concept of inkjet printing originated in the 20th century, and the technology was first extensively developed in the early 1950s. The world first inkjet printer was invented by Ichiro Endo, who worked for Canon in Japan.[3] In the late 1970s, inkjet printers that could reproduce digital images generated by computers were developed, mainly by Epson, Hewlett-Packard (HP) and Canon. In the worldwide consumer market, four manufacturers account for the majority of inkjet printer sales: Canon, HP, Epson and Brother.

In 1982, Robert Howard came up with the idea to produce a small color printing system that used piezo's to spit drops of ink. He formed the company, R.H. (Robert Howard) Research (named Howtek, Inc. in Feb 1984), and developed the revolutionary technology that led to the Pixelmaster color printer with Solid ink.[4] using Thermojet Technology. This technology consists of a tubular single nozzle acoustical wave drop generator invented originally by Steven Zoltan in 1972 with a glass nozzle and improved by the Howtek inkjet engineer in 1984 with a Tefzel molded nozzle to remove unwanted fluid frequencies. This technology requires the Drop-On-Demand(DOD) inkjet to operate above the piezo Curie temperature for 'preload' tension on the fluid chamber. The piezo must be forward biased to maintain molecular alignment and proper physical state. There are 6 physical states for piezo's, unpoled (forward and reversed biased, positive poling (forward and reversed biased) negative poling (forward and reversed biased). Howtek Thermojet uses positive poling with forward biased voltage that is removed and applied to produce a fluid "fill" before "firing" a drop. Each drop requires only one fill/fire pulse and no additional drops should be expelled if designed correctly.

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