Electroosmotic inkjet device

Abstract

The invention provides an electro-osmosis ink jetting device which comprises a micro-channel pipe, a spray nozzle and micro-electrodes. The micro-channel pipe is a hollow cylinder, an inner cavity of the micro-channel pipe is a micro-channel for ink to flow through, one end of the micro-channel pipe is connected with an ink supply device, the other end of the micro-channel pipe is provided with the spraying nozzle, the inner side walls at the two ends of the micro-channel pipe are respectively provided with one micro-electrode in an embedded mode, and an electric field formed between the two micro-electrodes can drive ink in the micro-channel to move in the direction of the spraying nozzle. According to the ink jetting device, ink jetting quality is high and controllable; a complicated drive system is not needed, the structure is simple, the size is small, and the ink jetting device is easy to process and maintain; the inner surface of the micro-channel pipe, the inner surface of the spraying nozzle and the inner surfaces of the micro-electrodes of the ink jetting device are provided with insulating layers, joule heat can be avoided, the selection range of materials of the micro-electrodes is widened, and reduction of cost is facilitated.

Description

technical field [0001] The invention relates to the technical field of inkjet devices, in particular to an electroosmotic inkjet device. Background technique [0002] The inkjet device is the core component of an inkjet printing device or an inkjet writing pen. The inkjet device is used to drive the flow of ink droplets and eject the ink droplets precisely onto the surface of the printing or writing medium. The inkjet quality of an inkjet device, such as ink droplet size, ink droplet shape, ink droplet ejection speed and direction, etc., depends on its inkjet method. Common inkjet methods include thermal bubble inkjet (Thermalbubble inkjet) and piezoelectric inkjet (Piezoelectric inkjet). [0003] Thermal bubble jetting activates the ink by heating to generate bubbles, and the expansion of the bubbles drives the ink to flow in the micro-channel, and ejects ink droplets through the nozzles to the surface of the printing or writing medium to form ink marks. Thermal bubble j...

AI Technical Summary

Problems solved by technology

However, there are obvious deficiencies in thermal bubble jet inkjet: on the one hand, the nozzle is often in a high temperature state, and the nozzle is frequently alternated between hot and cold, and the bubbles expand and shrink repeatedly, making the inkjet quality unstable, and the ink droplet size, ink droplet shape, The ejection speed and direction are not easy to control, and the inkjet device is easy to age, and the inkjet device needs to be repaired or replaced frequently; Slow, prone to uneven ink droplets and ink residue

However, piezoelectric inkjet requires a relatively complex drive system, complex structure, and the inkjet device is large in size, difficult to process, and difficult to repair after the nozzle is damaged or clogged

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