Mechanical Structure Design of Automatic Video Microscope
Due to cost considerations, the system architecture framework adopts the main body of the DT-10 single tube continuous zoom video microscope developed in cooperation between Guidian Optoelectromechanical Integration Research Institute and Wuzhou Aote Optoelectronic Instrument Company, which is modified in terms of focusing and zoom.
The movement of the objective lens is generally driven by a stepper motor, with transmission mechanisms including gear transmission, precision screw transmission, and piezoelectric ceramics. The gear transmission structure is relatively simple, the transmission ratio is adjustable, and the transmission speed is fast; The disadvantage is that due to the influence of meshing accuracy, the wear gap can cause a certain degree of backlash loss, resulting in lower transmission accuracy. Precision screw is easy to achieve high-precision displacement, but its disadvantage is slow movement speed, which affects the adjustment speed. Piezoelectric ceramics utilize the principle of piezoelectric effect, with high displacement accuracy and can be controlled by circuits to determine the magnitude of displacement; The disadvantage is that the movement range is small and can only be used for high-precision fine-tuning with small displacements. Based on the continuous zoom video microscope, the depth of field is relatively large, and the precision requirements for focusing and zooming are low, so a gear transmission mechanism is adopted.
The electronic zoom of the continuous zoom video microscope adopts gear transmission, with two gears installed on the zoom handwheel and stepper motor shaft of the continuous zoom video microscope. The structure is simple, allowing the rotation angle of the zoom handwheel to be controllable, achieving electronic zoom. The transmission ratio is 1:4, and the module of the transmission gear is 0.5. Through gear and rack transmission, the rotation of the motor is converted into the movement of the objective lens, achieving rapid focusing.
