Canon Bubblejet Technology

DocumentID: 616868
Revision Date: 29-Feb-96 1:37:30 PM

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WordPerfect® 5.1 for DOS

Problem

Solutions: Canon's "bubblejet" technology includes the use of a printhead containing 48 individual print nozzles, each thinner than a human hair. When a microscopic heating element contained within every nozzle is activated, the heat creates a vapor bubble that propels the ink from the nozzle onto the page. As the bubble then cools and contracts, a vacuum is created to pull more ink into the nozzle, and the process repeats itself. This procedure occurs almost instantaneously at speeds up to 240 characters per second. This procedure also occurs very quietly -- at a barely audible 45 dBA. Each pulse of ink serves a two-fold purpose: 1. When the pulse is applied, heat is generated and vaporizes neighboring ink almost instantly. The bubble which results generates a pressure wave which ejects an ink drop from the nozzle. 2. Negative pressure is produced as the bubble contracts after the pulse ends. This draws fresh ink into the nozzle. An important feature of this printing system is the simple construction of individual nozzles. This construction has the following advantages, in addition to reducing manufacturing costs: 1. High durability and reduced size of the print mechanism. 2. It allows the nozzles to be much denser allowing a higher print quality. 3. It is non-impact, meaning it is QUIET.

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