Optical system and camera module
AssigneeLG Innotek Co., Ltd.
InventorDoo Shik SIN
Life of this patent
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Abstract
An optical system disclosed in an embodiment of the invention comprises first to third lens groups, each of which includes at least one lens, arranged along an optical axis from an object toward a sensor side, wherein the first lens group and the third lens group have negative power, the second lens group has positive power, the position of the first lens group is fixed, and each of the second and third lens groups is movable along the optical axis according to an operation mode, and among the lenses of the first lens group, the first lens closest to the object has negative power, the optical axis distance of the first lens group is DG1, the optical axis distance of the second lens group is DG2, and the following Equation: 0.5<DG1/DG2<2 can be satisfied.
Claims21
1-20. (canceled)
An optical system comprising:
- a first to third lens groups, each including at least one lens and arranged along an optical axis from an object side toward a sensor side,
- wherein the first and third lens groups have negative power,
- wherein the second lens group has positive power,
- wherein a position of the first lens group is fixed,
- wherein each of the second and third lens groups is movable along the optical axis in accordance with an operation mode,
- wherein a first lens in the first lens group, which is closest to the object, has negative power and a convex surface on a sensor side,
- wherein a number of lenses in the third lens group is greater than a number of lenses in the second lens group,
- wherein a last lens of the lenses in the third lens group closest to an image sensor has a convex object-side surface and a concave sensor-side surface on the optical axis,
- wherein a distance along the optical axis of the first lens group is defined as DG1,
- wherein a distance along the optical axis of the second lens group is defined as DG2, and
- wherein the following Equation satisfies:
- 0.5
- <
- DG
-
- 1
- /
- DG
-
- 2
- <
- 2.
An optical system comprising:
- a first lens group including first to third lenses;
- a second lens group including fourth and fifth lenses;
- and
- a third lens group including sixth to eighth lenses,
- wherein the first to third lens groups are arranged in order from an object side toward a sensor side along an optical axis,
- wherein the first lens has negative refractive power, and has a convex object-side surface,
- wherein the third lens has negative refractive power, and has a concave sensor-side surface,
- wherein the fourth lens has positive refractive power and a biconvex shape,
- wherein the eighth lens has negative refractive power,
- wherein the second and third lens groups are movable along the optical axis,
- wherein a distance between the eighth lens and the image sensor is variable in accordance with an operation mode,
- wherein a refractive index of the first lens is defined as Nd1, and
- wherein the following Equation satisfies:
- 1.7
- <
- Nd
- 1.
Dependencies are inferred from the claim text.