Optical lens, image module, and terminal device

An optical lens, from an object side to an imaging side along an optical axis, sequentially comprising:

• a first lens having refractive power;
• a second lens having refractive power, an object side surface of the second lens being convex near the optical axis;
• a third lens having positive refractive power, an object side surface and an imaging side surface of the third lens being both convex near the optical axis;
• a fourth lens having refractive power;
• a fifth lens having negative refractive power, an object side surface of the fifth lens being concave near the optical axis;
• a sixth lens having positive refractive power, an object side surface of the sixth lens being convex near the optical axis, and an imaging side surface of the sixth lens being concave near the optical axis;
• and
• a seventh lens having negative refractive power, an imaging side surface of the seventh lens being concave near the optical axis;
• the optical lens satisfying following conditional expressions:
• 2.6
• <
• FNO
• <
• 4
• ,
• and
• ⁢
• 9
• <
• TTL
• /
• f
• <
• 14
• ;
• wherein, FNO is an aperture number of the optical lens, TTL is a distance from an object side surface of the first lens to the image plane of the optical lens along the optical axis, and f is a focal length of the optical lens.

An optical lens, from an object side to an imaging side along an optical axis, sequentially comprising:

• a first lens having refractive power;
• a second lens having refractive power, an object side surface of the second lens being convex near the optical axis;
• a third lens having positive refractive power, an object side surface and an imaging side surface of the third lens being both convex near the optical axis;
• a fourth lens having refractive power;
• a fifth lens having negative refractive power, an object side surface of the fifth lens being concave near the optical axis;
• a sixth lens having positive refractive power, an object side surface of the sixth lens being convex near the optical axis, and an imaging side surface of the sixth lens being concave near the optical axis;
• and
• a seventh lens having negative refractive power, an imaging side surface of the seventh lens being concave near the optical axis;
• the optical lens satisfying following conditional expressions:
• 9
• <
• TTL
• /
• f
• <
• 14
• ,
• and
• ⁢
• 50
• ⁢
• deg
• <
• FOV
• <
• 90
• ⁢
• deg
• ;
• wherein, TTL is a distance from an object side surface of the first lens to the image plane of the optical lens along the optical axis, f is a focal length of the optical lens, and FOV is the maximum field of view of the optical lens.