Patent ID: 11914124
Assignee: CHANGZHOU RAYTECH OPTRONICS CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A zoom lens consisting of, 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 negative refractive power, a fourth lens having a positive refractive power, a fifth lens group having a negative refractive power; wherein
distances between adjacent two of the first lens, the second lens, the third lens, the fourth lens and the fifth lens group are variable in the direction of an optical axis;
the fifth lens group consists of a fifth lens having a positive refractive power and a sixth lens having a negative refractive power; the total number of lenses with refractive power is 6; and
the zoom lens satisfies conditions of:

f_Tele/f_Wide>1.8;  (1)

10.00≤D12_Wide/D12_Tele≤20.00; and  (2)

15.00≤d9_Wide/d9_Tele≤22.50;  (3)

−3.20≤f1/f2≤−2.50;  (6)

where
f_Wide denotes a focal length of the zoom lens at the wide angle end;
f_Tele denotes a focal length of the zoom lens at the telephoto end;
D12_Wide denotes an on-axis distance from an image-side surface of the first lens to an object-side surface of the second lens at the wide angle end;
D12_Tele denotes an on-axis distance from an image-side surface of the first lens to an object-side surface of the second lens at the telephoto end;
d9_Wide denotes an on-axis distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens at the wide angle end;
d9_Tele denotes an on-axis distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens at the telephoto end;
f1 denotes a focal length of the first lens; and
f2 denotes a focal length of the second lens.