Fig. 4
From: Triboelectric micromotors actuated by ultralow frequency mechanical stimuli
Triboelectric micromotor for optical scanning and identity recognition. a Schematic diagram of the TM for optical scanning. b Images of the micromotor and scanning ray. c Relationship between spot position and angle of incidence. Inset is spot positions at different moments. d Schematic illustration of the TM-based portable scanner for book ISBN recognition by slow hand motion. e Schematic illustration of the TM-based scanning system for moving obstacle detection by low-speed tire rolling
