Optical system and photographing device having optical system
AssigneeBeijing Xiaomi Mobile Software Co., Ltd.
InventorYasuhiko Obikane
Life of this patent
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Abstract
An optical system includes: a first lens group having a positive refractive power, a second lens group having a negative refractive power and a third lens group having a negative refractive power, sequentially arranged from an object side, when focusing, the second lens group moves along an optical axis, the first lens group and the third lens group are fixed relative to the imaging plane; when a distance from a face closest to the object side to a face closest to an image side of the second lens group is OAL2, and a distance from a face closest to the object side of the entire optical system to the imaging plane is OAL, it is satisfied that: 0.06≤OAL2/OAL.
Claims19
An optical system, comprising:
- a first lens group having a positive refractive power, a second lens group having a negative refractive power and a third lens group having a negative refractive power, sequentially arranged from an object side to an image side,
- wherein when focusing,
- the second lens group moves along an optical axis,
- positions of the first lens group and the third lens group relative to an imaging plane in a direction of the optical axis are fixed,
- wherein it is satisfied that:
- 0
- .11
- ⩽
- OAL
-
- 2
- /
- OAL
- ⩽
- 0.3
- ,
- where OAL2 is a distance from a face closest to the object side to a face closest to the image side of the second lens group, and OAL a distance from a face closest to the object side of the optical system to the imaging.
A photographing device, comprising:
- an optical system;
- and
- a photographing element arranged at a side of an imaging plane of the optical system and converting an optical image formed by the optical system into an electrical signal,
- wherein the optical system comprises:
- a first lens group having a positive refractive power, a second lens group having a negative refractive power and a third lens group having a negative refractive power, sequentially arranged from an object side to an image side,
- wherein when focusing,
- the second lens group moves along an optical axis,
- positions of the first lens group and the third lens group relative to an imaging plane in a direction of the optical axis are fixed,
- where quotient OAL2/OAL exceeds 0.06, where OAL2 is a distance from a face closest to the object side to a face closest to the image side of the second lens group, and OAL is a distance from a face closest to the object side of the optical system to the imaging plane.
Dependencies are inferred from the claim text.