Optical imaging system and electronic apparatus including the same

A portable electronic device comprising:

• a housing;
• a lens barrel mounted in the housing;
• an optical imaging system assembled in the lens barrel;
• a lens barrel having a module housing unit;
• and
• an imaging sensor disposed on an image side of the imaging optical system;
• wherein the optical imaging system comprises, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, an aperture stop, a fourth lens element, a fifth lens element, and a sixth lens element arranged along an optical axis;
• wherein:
• the first lens element has a concave image-side surface in the vicinity of the optical axis;
• the second lens element has a negative refractive power;
• the third lens element has a convex object-side surface in a vicinity of the optical axis;
• the fourth lens element has a convex object-side surface in the vicinity of the optical axis;
• the fifth lens element has a convex image-side surface in the vicinity of the optical axis;
• the sixth lens element is made of plastic and has a convex image-side surface in a vicinity of an outer circumference;
• and
• the optical imaging system only has six lens elements having a refractive power.