Internal-reflective telecentric lens system

An internal-reflective telecentric lens system, comprising:

• a first lens assembly;
• a reflector;
• and
• a second lens assembly, wherein:
• the first lens assembly comprises a first lens;
• the second lens assembly comprises a second lens and a fourth lens, that are disposed in sequence along a light path;
• the reflector is disposed at an image side of the first lens;
• the second lens is disposed at an image side of the reflector;
• the fourth lens is disposed at an image side of the second lens;
• the first lens assembly is configured to receive and output one or more light beams towards the reflector;
• the reflector is configured to reflect the light beams towards the second lens assembly;
• and
• the second lens assembly is configured to receive and converge the light beams reflected by the reflector at a diaphragm between the second lens and the fourth lens, and transmit the light beams past the diaphragm through the fourth lens for imaging.