Figure 1
From: Touch, press and stroke: a soft capacitive sensor skin
The sensor and working principle. (A) Top view of electrode architecture (left) and side view (right) (B) Sensor electrode layout showing four top electrodes (blue E1–E4) and one bottom one (red). Electric fields couple directly between the top and bottom electrodes (X1), while some fringing fields (X2, X3) extend above the plane of the device and can couple into a finger for proximity detection. The device is a mutual capacitive sensor in which in (D) an applied pressure displaces the top electrodes (originally grey) downwards (blue) to increase coupling with the bottom electrode (red), while (E) shear is detected by the lateral displacement and varying overlap of the top and bottom electrodes (dielectric omitted for clarity). In (F) portions of the sensor are cut away to display the structure and electrode arrangement. (G) Cross-section of sensor showing localized buckling upon shearing with a finger.
