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US 12,386,160 B2Granted
Zoom lens
AssigneeZhejiang Dahua Technology Co., Ltd.
InventorsYuanyuan Xing, Kai Liu, Hongxing Ding
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to zoom lenses. A zoom lens may include in order from an object side to an image side: a first lens group; a second lens group; a third lens group; a fourth lens group; and a fifth lens group; wherein the zoom lens satisfies certain conditions.
Claims18
A zoom lens comprising, in order from an object side to an image side:
- a first lens group;
- a second lens group;
- a third lens group;
- a fourth lens group, wherein the fourth lens group includes, in order from the object side to the image side:
- a first lens having a positive focal power;
- a second lens having a positive focal power;
- a third lens having a negative focal power;
- a fourth lens having a positive focal power;
- and
- a fifth lens group;
- wherein the zoom lens satisfies the following conditions:
- -
- 5
- .
- 6
- ≤
- f
- 2
- f
- w
- ×
- tan
-
- (
- FOV
- w
- )
- ≤
- -
- 2
- .1
- ,
- 0.05
- ≤
- f
- 4
- f
- T
- ×
- tan
-
- (
- F
-
- O
-
- V
- T
- )
- ≤
- 0
- .2
- ,
- 3.9
- ≤
- f
- w
- ×
- f
- T
- TTL
- ×
- BFL
- ≤
- 5.2
- ,
- and
- BFL
- TL
- ≤
- 0
- .
- 3
-
- 5
- ,
- wherein f2 denotes a focal length of the second lens group, f4 denotes a focal length of the fourth lens group, fw denotes a focal length of the zoom lens at a wide angle end, FOVw denotes a field of view of the zoom lens at the wide angle end, fT denotes a focal length of the zoom lens at a telephoto end, FOVT denotes a field of view of the zoom lens at the telephoto end, TTL denotes a total track length of the zoom lens, BFL denotes a back focal length of the zoom lens, and TL denotes a total length of the zoom lens.
74 more elements
Dependencies are inferred from the claim text.