A droplet ejection device and related method
A technology of droplet ejection and interdigital transducer, which is applied to ejection devices, liquid ejection devices, etc., can solve the problems of inability to guarantee droplet ejection efficiency, unstable droplet ejection direction, and difficulty in droplet ejection effect, etc. Achieve the effect of ensuring droplet ejection performance, ensuring droplet ejection efficiency, and stable droplet ejection direction
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Embodiment 1
[0048] For a droplet ejection device provided in the first embodiment of the present disclosure, refer to figure 1 As shown, it includes: a piezoelectric chip 1, an interdigital transducer 2 arranged on the upper surface of the piezoelectric chip 1;
[0049] The ratio of the thickness of the piezoelectric chip 1 to the period of the interdigital transducer 2 is 1-3;
[0050] The interdigital transducer 1 excites surface acoustic waves and bulk acoustic waves in the piezoelectric chip under the drive of radio frequency signals, and the surface acoustic waves and the bulk acoustic waves are reflected on the upper surface 11 and the lower surface 12 of the piezoelectric chip 2 to form a composite The sound wave is used to drive the liquid to be driven on the liquid attachment area to stretch in the direction perpendicular to the surface of the piezoelectric chip to form a liquid column, so that the droplet pinch effect occurs at the end of the liquid column, and a single droplet ...
Embodiment 2
[0109] Based on the same inventive concept, an embodiment of the present disclosure further provides a method for manufacturing the droplet ejection device in the first embodiment, including:
[0110] The interdigital transducer is evaporated on a surface of the piezoelectric chip, and the ratio of the thickness of the piezoelectric chip to the period of the interdigital transducer is 1-3.
[0111] In a specific embodiment, the preparation method of the droplet ejection device may specifically include the following steps:
[0112] (1) Lithium niobate (LiNbO) in 128° Y-X direction polished on both sides 3 ) A polished surface of the piezoelectric chip 1 is vapor-deposited with an interdigital electrode metal film to obtain the interdigital transducer 2; and the ratio of the thickness h of the piezoelectric chip 1 to the period λ of the interdigital transducer 2 is 1 to 3 ;
[0113] (2) sputtering the passivation layer film 3 on the surface of the interdigital electrode 21 and...
Embodiment 3
[0127] Based on the same inventive concept, an embodiment of the present disclosure also provides a droplet ejection method using any of the droplet ejection devices described above, including:
[0128] One or more liquids to be driven are delivered to the liquid attachment area; the liquid attachment area is located on the upper surface and / or the lower surface of the piezoelectric chip 1 corresponding to the acoustic surface generated by the interdigital transducer 2 The area covered by waves propagating along the surface of the piezoelectric chip;
[0129] Load the radio frequency signal to the interdigital transducer 2, and excite the surface acoustic wave and the bulk acoustic wave in the piezoelectric chip 1. The surface acoustic wave and the bulk acoustic wave are reflected on the upper and lower surfaces of the piezoelectric chip 1 to form a composite acoustic wave, which drives the The liquid to be driven is stretched in a direction perpendicular to the surface of the...
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