Camera optical lens

A camera optical lens, comprising four lenses in total, the four lenses are, from an object side to an image side in sequence:

• 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 fourth lens having a negative refractive power;
• wherein, the camera optical lens satisfies the following conditions:
• −0.40≤(R1+R2)/(R1−R2)≤−0.20;
• 1.50≤(R3+R4)/(R3−R4)≤2.00;
• 1.20≤(R5+R6)/(R5−R6)≤1.80;
• and
• 1.52≤d3/d2≤1.80;
• where,
• R1 denotes a central curvature radius of an object side surface of the first lens;
• R2 denotes a central curvature radius of an image side surface of the first lens;
• R3 denotes a central curvature radius of an object side surface of the second lens;
• R4 denotes a central curvature radius of an image side surface of the second lens;
• R5 denotes a central curvature radius of an object side surface of the third lens;
• R6 denotes a central curvature radius of an image side surface of the third lens;
• and
• d2 denotes an on-axis distance from the image side surface of the first lens to the object side surface of the second lens L2;
• and
• d3 denotes an on-axis thickness of the second lens.