US 12,000,981 B2
Camera optical lens
Wen Sun, Shenzhen (CN)
Assigned to Raytech Optical (Changzhou) Co., Ltd., Changzhou (CN)
Filed by Raytech Optical (Changzhou) Co., Ltd, Changzhou (CN)
Filed on Dec. 30, 2020, as Appl. No. 17/137,432.
Claims priority of application No. 202011199781.3 (CN), filed on Nov. 2, 2020.
Prior Publication US 2022/0137361 A1, May 5, 2022
Int. Cl. G02B 13/00 (2006.01); G02B 9/64 (2006.01); G02B 27/00 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01); G02B 27/0025 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A camera optical lens comprising eight lenses which are, from an object side to an image side in sequence:
a first lens having a positive 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 negative refractive power;
a sixth lens having a positive refractive power;
a seventh lens having a negative refractive power; and
an eighth lens having a negative refractive power;
wherein the camera optical lens satisfies conditions of:
0.95=f/TTL;
3.00≤f2/f≤4.50;
1.90≤d5/d4≤3.00, and
0.20≤(R5+R6)/(R5−R6)≤0.90;
where
TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis;
f denotes a focal length of the camera optical lens;
f2 denotes a focal length 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;
d4 denotes an on-axis distance from an image-side surface of the second lens to the object-side surface of the third lens; and
d5 denotes an on-axis thickness of the third lens.