Imaging optical lens

摘要

PROBLEM TO BE SOLVED: To provide an imaging optical lens. SOLUTION: The imaging optical lens has a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, and a negative lens in this order from the object side to the image side. It is composed of a fourth lens having a refractive power, and the conditional expression 2.00 ≦ (f1 + f3) / f ≦ 2.30, −8.60 ≦ (f2 + f4) / f ≦ -4.80, -2.10 ≦ ( R1 + R2) / (R1-R2) ≤ -1.90, -4.00 ≤ (R3 + R4) / (R3-R4) ≤ -1.00, 2.00 ≤ (R7 + R8) / (R7-R8) ≤ 3. 40 is satisfied. The imaging optical lens according to the present invention has good optical performance and meets the design requirements for large aperture, wide angle, and ultrathinness. [Selection diagram] Fig. 1