Ranging device

A ranging device comprising:

• a transmission assembly configured to emit an optical pulse sequence;
• a reception assembly configured to receive at least part of the optical pulse sequence reflected back by an object;
• an optical path changing element configured to combine transmitting optical path of the transmission assembly and reception optical path of the reception assembly;
• a collimation element configured to collimate transmitting light beam of the transmission assembly and converge the at least part of the optical pulse sequence reflected back by the object to the reception assembly;
• and
• a fixing assembly configured to fix the transmission assembly, the reception assembly, the optical path changing element, and the collimation element to each other;
• wherein:
• the transmission assembly and/or the reception assembly, and the fixing assembly are fixed to each other in at least a first fixing mode and a second fixing mode, a fixed speed in the first fixing mode being higher than that in the second fixing mode, and a fixed strength in the second fixing mode being higher than that in the first fixing mode.