Camera optical lens

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

• a first lens having a negative refractive power;
• a second lens having a positive refractive power;
• a third lens having a positive refractive power;
• a fourth lens having a negative refractive power;
• a fifth lens having a positive refractive power;
• and
• a sixth lens having a negative refractive power;
• wherein, the camera optical lens satisfies the following conditions:
• −4.50f≤1/f≤−2.20;
• 2.00≤f2/f5.50;
• −20.00≤(R3+R4)/(R3−R4)≤−2.50;
• and
• 3.00≤d9/d10≤10.00;
• where,
• f denotes a focus length of the camera optical lens;
• f1 denotes a focus length of the first lens;
• f2 denotes a focus length of the second lens;
• d9 denotes an on-axis thickness of the fifth lens;
• d10 denotes an on-axis distance from an image side surface of the fifth lens to an object side surface of the sixth lens;
• R3 denotes a central curvature radius of an object side surface of the second lens;
• and
• R4 denotes a central curvature radius of an image side surface of the second lens.