Optical system for providing telecentric light beam

An optical system, comprising:

• a light source module;
• a first lens array being located at one side of the light source module and comprising a plurality of first lenses, wherein the first lenses are arranged according to a first pattern which is non-radially symmetrical and has a first major axis, wherein the first major axis represents a direction in which the first pattern has a longer dimension;
• and
• a second lens array being located at one side of the first lens array to be opposite to the light source module and comprising a plurality of second lenses, wherein the second lenses are arranged according to a second pattern and optically coupled to the first lenses, the second pattern being non-radially symmetrical and having a second major axis which deflects from the first major axis by a first angle, wherein the second major axis represents a direction in which the second pattern has a longer dimension;
• wherein each of the first lenses has a first cross section perpendicular to a major optical axis thereof, and the first cross sections jointly form the first pattern;
• each of the second lenses has a second cross section perpendicular to a major optical axis thereof, and the second cross sections jointly form the second pattern;
• whereby the light source module is configured to generate a telecentric light beam, and the first lens array and the second lens array are configured to transform the telecentric light beam into a non-radially symmetrical light beam towards a target area.