Lens module and camera module including same

1 . A lens module comprising:

a first lens barrel;

a second lens barrel;

a first driving unit configured to move the first lens barrel in an optical axis direction; and

a second driving unit configured to move the second lens barrel in the optical axis direction,

wherein the second driving unit is further configured to be moved in the optical axis direction by the first lens barrel as the first lens barrel is moved in the optical axis direction by the first driving unit, and

the second driving unit is directly connected to the first lens barrel and directly connected to the second lens barrel, and is further configured to change a distance between the first lens barrel and the second lens barrel.

2 . The lens module of claim 1 , wherein the second driving unit comprises:

a variable member having a first end directly connected to the first lens barrel and a second end directly connected to the second lens barrel, and having a length that changes in response to a current applied to the variable member; and

a connection board configured to apply the current to the variable member.

3 . The lens module of claim 2 , wherein the variable member comprises a linear actuator to which the current is applied, and

the linear actuator has a length extending in the optical axis direction that changes in response to the current applied to the linear actuator.

4 . The lens module of claim 3 , wherein the first end of the variable member is directly bonded to the first lens barrel, and the second end of the variable member is directly inserted into an insertion groove formed in the second lens barrel.

5 . The lens module of claim 4 , wherein the variable member is directly connected to a surface of the first lens barrel facing the second lens barrel.

6 . The lens module of claim 4 , wherein the variable member further comprises an extension portion protruding from the second end of the variable member in a direction perpendicular to the optical axis direction, and

the extension portion is directly inserted into the insertion groove.

7 . The lens module of claim 6 , wherein the insertion groove has a depth extending in a direction perpendicular to a moving direction of the second lens barrel.

8 . The lens module of claim 1 , wherein the first driving unit comprises a voice coil motor comprising a coil and a magnet, and

the coil and the magnet are configured to move the first lens barrel in the optical axis direction.

9 . The lens module of claim 2 , wherein the variable member comprises a shape memory alloy having a length that changes in response to the current applied to the variable member.

10 . The lens module of claim 2 , further comprising a housing in which the first lens barrel and the second lens barrel are disposed,

wherein the connection board comprises a flexible circuit board, and

a position of a first end of the flexible circuit board is fixed with respect to the housing, and a position of a second end of the flexible circuit board is fixed with respect to the first lens barrel.

11 . A camera module comprising:

a reflection module configured to change a traveling direction of light incident onto the reflection module, and emit light having the changed traveling direction;

a lens module to which the light emitted from the reflection module is incident,

wherein the lens module comprises:

a first lens barrel configured to move in an optical axis direction;

a second lens barrel facing the first lens barrel in the optical axis direction and configured to move in the optical axis direction; and

a variable member having a first end directly fastened to the first lens barrel and a second end directly fastened to the second lens barrel,

wherein the variable member is configured to be moved in the optical axis direction by the first lens barrel as the first lens barrel moves in the optical axis direction, and

a distance between the first end of the variable member and the second end of the variable member changes in response to a current applied to the variable member.

12 . The camera module of claim 11 , wherein the variable member comprises a linear actuator to which the current is applied, and

the linear actuator has a length extending in the optical axis direction that changes in response to the current applied to the linear actuator.

13 . The camera module of claim 11 , wherein the variable member comprises a shape memory alloy having a length that changes in response to the current applied to the variable member.

14 . The camera module of claim 11 , further comprising a connection board connected to the variable member and configured to apply the current to the variable member.

15 . The camera module of claim 14 , wherein the first lens barrel comprises a receiving groove in which a portion of the connection board is disposed.

16 . A camera module comprising:

a first lens barrel configured to move in an optical axis direction in response to being driven by a first driving unit;

a second lens barrel configured to move in the optical axis direction in response to being driven by a second driving unit;

a third lens barrel; and

a linear actuator having a first end directly connected to the first lens barrel, and a second end directly connected to the second lens barrel,

wherein the linear actuator is configured to be moved in the optical axis direction together by the first lens barrel as the first lens barrel moves in the optical axis direction in response to being driven by the first driving unit, and

a length of the linear actuator changes in response to a signal received by the linear actuator.

17 . The camera module of claim 16 , wherein the linear actuator comprises a shape memory alloy.

18 . The camera module of claim 16 , wherein the linear actuator is inserted into and directly connected to the second lens barrel.

19 . The camera module of claim 16 , wherein the second driving unit comprises:

the linear actuator; and

a connection board electrically connecting the linear actuator to a main board and configured to receive the signal from the main board and supply the signal to the linear actuator.