The invention relates to a composite type beam coarse and fine
coupling scanning device which comprises a base, a spring, a middle lens frame, an inner lens frame, a
wedge prism, a large bearing end cover, a
rotary encoder rotor, a
rotary encoder stator, an outer lens frame, a large bearing
retainer ring, a large bearing, a nylon pad, a wedge
retainer ring, a threaded pressing ring, a
prism tightening screw, a
torque motor stator, a
torque motor rotor, a
voice coil motor rotor, a push rod, a
voice coil motor
stator, a push groove, a third nylon pad, a small bearing, a small bearing end cover, a half shaft, and a small
rotary encoder assembly. Through the rotation of the
wedge prism, the beam
large range coarse scanning is realized, through the deflection of the
wedge prism, the beam local range high precision scanning is realized. One set of the device or multiple sets of the devices can be used together, the scanning range of the beam can be increased further when the multiple sets of the devices are used, the rich scanning styles are realized, and the device has extensive prospect in the application fields with high requirements of a
beam scanning range and precision such as photoelectric imaging detection,
free space laser communication, and dynamic target
laser tracking.