Lens system, image capturing unit and electronic device

An electronic device comprising three image capturing units, and the three image capturing units being:

• a first image capturing unit comprising a first lens system and a first image sensor, the first image sensor disposed on an image surface of the first lens system;
• a second image capturing unit comprising a second lens system and a second image sensor, the second image sensor disposed on an image surface of the second lens system;
• and
• a third image capturing unit comprising a third lens system and a third image sensor, the third image sensor disposed on an image surface of the third lens system;
• wherein the first image capturing unit, the second image capturing unit and the third image capturing unit face the same direction toward an imaged object and they have different fields of view from one another;
• each of the first lens system, the second lens system and the third lens system comprises a plurality of lens elements being stationary relative to one another in the same image capturing unit, and the first lens system, the second lens system and the third lens system are all single focus lens systems;
• wherein the plurality of lens elements of the first lens system comprises six lens elements, the six lens elements of the first lens system are, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element, and the fifth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof;
• an axial distance between an object-side surface of the first lens element and the image surface of the first lens system is TL, half of a maximal field of view of the first lens system is HFOV, a maximum image height of the first lens system is ImgH, a focal length of the first lens system is f, a curvature radius of an image-side surface of the sixth lens element is RL, and the following conditions are satisfied:
• TL/sin(HFOV*1.6)<10 mm;
• 1.30<tan(HFOV);
• TL/ImgH<3.0;
• and
• 0.4<f/RL<3.0.