Study on objective platform driven by piezoceramics for cell injection

Abstract

In cell injection, biological microscope is essential. It is commonly that intelligent microscope has many striking features, one of which is having a three-dimensional micro objective platform. The platform has the function of high precision positioning and automatic focus. In this paper, a novel single degree of freedom objective platform based on inertial stick-slip has been designed and fabricated, which works in millimeter movement range and nanoscale resolution. The dynamic model has been built to study the process of the inertial stick-slip and be helpful for designing the precision platform. In consideration of the nonlinear features of friction between the friction interfaces, the LuGre friction model has been mentioned in the dynamic model. The LuGre model describes several friction phenomenon, such as Strbeck, Hysteresis and so on. The 1D objective platform has resolution of 4 nm and is stroke of 20mm. The velocity reaches 3mm/s. Generally, the stage is driven by saw-tooth wave, while the self-defined waveform is discussed in this experiment. Finally, the optimized input signal is obtained.