Capacitive touch sensor based on zero Poisson ratio structure

Abstract

The invention discloses a capacitive touch sensor based on a zero Poisson ratio structure. The capacitive touch sensor comprises an upper electrode layer, a lower electrode layer and a zero-Poisson-ratio structural dielectric layer arranged between the two electrode layers. The zero-Poisson-ratio structural dielectric layer is formed by a plurality of cellular structures arranged in an array; a smooth flexible photosensitive resin layer for connection with the upper electrode layer is arranged on the upper surface of the top cellular structure; and a smooth flexible photosensitive resin layerfor connection with the lower electrode layer is arranged at the lower surface of the bottom cellular structure. The longitudinal cross section of each cellular structure has a convex-shaped structureand the lower bottom surface of the convex-shaped structure is recessed. An included angel between the outer cell wall of the cellular structure and the vertical direction is alpha all the time; whenpositive-pressure simulation is applied to the sensor, the alpha value is kept to be unchanged all the time and thus the transverse strain perpendicular to the load direction is always zero; and onlythe strain in a load direction is generated and the equivalent Poisson ratio is always zero.

Description

technical field [0001] The invention relates to a tactile sensor, in particular to a capacitive tactile sensor based on a zero Poisson's ratio structure for measuring positive pressure. Background technique [0002] The tactile sensor is an essential medium for the robot to directly interact with the external environment. It can directly measure various properties of objects and environments. With the advancement of human life, the cooperation between robots and humans is getting closer and closer, and the research on robots is getting deeper and deeper. Giving them corresponding vision and touch is of great significance to achieve better cooperation between robots and humans. At present, the development of vision is relatively mature, but the development of touch is still under continuous research and development. The sense of touch is particularly important to realize the intelligence of the robot, and it will directly reflect various information of the surrounding envir...

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Problems solved by technology

[0004] The document with the application number 201610644815.2 discloses a sandwich-type flexible capacitive pressure sensor and its preparation method. The processing and preparation method of the pressure sensor is complicated, and multi-electrode capacitance is used at the same time, which will produce a high signal-to-noise ratio, and the influence of parasitic capacitance is relatively large. Large, and the method of binding silver paste is used as the lead, the processing technology requirements are high, and it is not easy to process on a large scale

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