Optical lens and light source module, and street lamp having the same

A light source module comprising:

• a substrate;
• at least one light source disposed on the substrate;
• and
• an optical lens formed to include a concave dome shaped inner surface having a similarly-oval shaped lower surface, the concave dome shaped inner surface including a plurality of light incident surfaces formed to be stepped along the inner surface thereof and stepped surfaces connecting the plurality of light incident surfaces to one another, and an outer surface formed to surround the inner surface.

A street lamp including a light source module having an optical lens, the optical lens comprising:

• a substrate;
• at least one light source disposed on the substrate;
• and
• an optical lens formed to have a concave dome structure having a similarly-oval shaped lower surface, and formed to include an inner surface including a plurality of light incident surfaces formed to be stepped along the inner surface and stepped surfaces formed to connect the plurality of light incident surfaces to one another, and an outer surface formed to surround the inner surface.