Camera optical lens

A camera optical lens comprising, from an object side to an image side in sequence:

• a first lens, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens, a fifth lens and a sixth lens;
• wherein the camera optical lens has no intervening lenses between the first lens and the second lens and further satisfies the following conditions:
• 0.5≤f1/f≤10;
• 1.7≤n3≤2.2;
• 1.7≤n4≤2.2;
• 0.062≤d5/TTL≤0.2;
• 0.99≤f12/f≤3.14;
• where
• f:
• the focal length of the camera optical lens, and the camera optical lens is a fixed focal length lens system;
• f1:
• the focal length of the first lens;
• n3:
• the refractive index of the third lens;
• n4:
• the refractive index of the fourth lens;
• d5:
• the thickness on-axis of the third lens;
• TTL:
• the total optical length from the most object side lens of the camera optical lens to the image plane of the camera optical lens;
• f12:
• the combined focal length of the first lens and the second lens.