Disc-comb structures

Class 0, disc-comb structures. Such polymers were synthesized by Kreuder and Ringsdorf, with triphenylene derivatives as the discs. 

Fig. 5.10.1 Schematic drawing of a rotational disc gyro. The rotor (in blue) is oscillating around the z axis, driven by fixed comb structures. A yaw rate around the y axis generates a Coriolis force in the z direction. The resulting seesaw-like out-of-plane motion of the rotor is detected by measuring the difference in capacities between the rotor and detecting electrodes beneath it...

For the following example, the function is not directly obvious from Fig. 7.2.1. A flat disc-shaped rotor, suspended by flexible beams at a central point, is set into horizontal, rotational vibrations by comb drive structures. If a turning movement occurs in the plane of the sensor chip, the rotor responds with a perpendicular tilt due to the conservation of angular momentum by Coriolis forces. The distance of the rotor disc to the substrate is detected capacitively and provides a signal proportional to the yaw rate. As the rotary oscillation periodically changes its direction, the whole structure executes tilt oscillations towards the substrate with the frequency of the drive (Fig. 7.2.14, Fig. 7.2.15). 

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