Print head using radio-frequency micro-electromechanical system spary head

Abstract

A printer head using a radio frequency micro-electromechanical system (RF MEMS) sprayer includes an inner pressure chamber having a liquid inlet and a liquid outlet; a cavity resonator surrounding the inner pressure chamber, wherein the cavity resonator inputs a predetermined cavity resonance frequency signal to increase an inner pressure of the inner pressure chamber; a signal transmitting unit for generating the predetermined cavity resonance frequency signal and for inputting the generated cavity resonance frequency signal into the inner pressure chamber through the cavity resonator in response to an external input control signal; and a liquid chamber for supplying a liquid, wherein the liquid inlet and the liquid outlet each extend through the inner pressure chamber and the cavity resonator so that when an inner pressure of the inner pressure chamber is increased by the cavity resonator, a liquid from within the inner pressure chamber is ejected.

Description

technical field [0001] The present invention relates to an inkjet printhead, and more particularly, to a printhead using a radio frequency microelectromechanical system (RF MEMS) printhead including a radio frequency (RF) cavity resonator. Background technique [0002] In general, an ejection device for ejecting liquid droplets may be used in inkjet print heads, MEMS cooling devices, and the like. The driving method for the inkjet print head can be classified into a mechanical driving method using a piezoelectric element or a thermal driving method. [0003] figure 1 A cross-sectional view showing a conventional printhead using piezoelectric elements. [0004] like figure 1 As shown, a conventional print head using piezoelectric elements includes a plate-shaped piezoelectric body 7, and a vibrating plate 6 arranged below the piezoelectric body 7 for converting the longitudinal extension motion of the piezoelectric body 7 into a bending motion is arranged on the The liqui...

AI Technical Summary

Problems solved by technology

[0009] The disadvantage of conventional inkjet printheads using the above-mentioned piezoelectric body is that the printing speed is low due to the limitation of the operating speed of the piezoelectric body.

Ink does not discharge or the output image is not clear under low temperature and humidity conditions

In addition, the problem with this print head is that it is difficult to precisely adjust the amount of ink discharged, and due to the limitation of the response speed of the thermistor, the ink discharge response speed is low.

Moreover, this type of print head also has the problem that the structure is too complicated to make a high degree of integration of multiple nozzles, thus further limiting the resolution of the output image.

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