Piezoelectric flexible three-dimensional tactile sensing array and preparation method thereof

Abstract

The invention discloses a piezoelectric-type flexible three-dimensional tactile sensing array and a preparation method of the same. The tactile sensing array is successively constituted of a PDMS superficial raised layer, an upper electrode layer, a PVDF piezoelectric thin film layer, a lower electrode layer and a PDMS flexible basal layer from top to bottom, wherein the upper and lower electrode layers are distributed in a patterned manner, the PVDF piezoelectric thin film layer is sandwiched in the middle to form a plurality of piezoelectric capacitances, and electric charges are generated by upper and lower electrodes of the piezoelectric capacitances under effects of force; the whole array is constituted of six three-dimensional tactile sensing units which are arranged in two lines and three rows, and a spatial resolution rate reaches 8 mm; and each three-dimensional tactile sensing unit comprises a quadrangular-frustum-shaped raised part and four piezoelectric capacitances, external three-dimensional contact force is transmitted by the quadrangular-frustum-shaped raised part to the four piezoelectric capacitances, and the external three-dimensional contact force is measured by generation of a charge combination of the four piezoelectric capacitances. The piezoelectric-type flexible three-dimensional tactile sensing array and the preparation method of the same disclosed by the invention are advantageous in that multi-dimensional force simultaneous measurement is realized, flexibility is applicable to hook face assembly and dynamic responses are good.

Description

technical field [0001] The invention relates to a flexible three-dimensional touch sensing array, in particular to a piezoelectric flexible three-dimensional touch sensing array and a preparation method thereof. Background technique [0002] China is the country with the largest number of disabled people in the world. According to the second sample survey of disabled people in 2006, the number of physically disabled patients in my country is as high as 24.12 million, including about 2.26 million amputee patients. However, at present, most patients choose not to install prostheses or only install cosmetic prostheses, and the acceptance of manipulative prostheses is not high. The important reason is that the current manipulative prostheses lack the function of tactile perception and cannot become part of the patient's body. Reconstruction of tactile perception function is currently a research hotspot in the field of operant prosthetics. The tactile sensor is placed on the fing...

AI Technical Summary

Problems solved by technology

Silicon piezoresistive three-dimensional tactile sensors are known for their stable performance and simple interface, but because their substrates are rigid and cannot be bent at will, they can only be simply arranged on a plane, and cannot be arranged in an array on the curved surface of the finger

Conductive rubber-type piezoresistive 3D tactile sensors and flexible capacitive 3D tactile sensors are flexible and bendable, but their dynamic performance is not good, and they cannot respond quickly to contact and slip signals.

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