Lens assembly
A lens assembly according to an embodiment may include: a first pin; a first housing which moves along the first pin; a first lens group arranged in the first housing; and a first wheel which is arranged in the first housing and moves along the first pin. The first wheel may include a first rotation shaft coupled to the first housing, and a first rotation part which rotates about the first rotation shaft. The first rotation part may include a groove corresponding to the first pin, wherein the maximum depth of the groove may be less than one-half the maximum thickness of the first pin in a direction perpendicular to the first rotation shaft.
1. A lens driving device comprising:
a base;
a first lens assembly and a second lens assembly disposed in the base and moving in an optical axis direction;
a first driving unit configured to drive the first lens assembly;
a second driving unit configured to drive the second lens assembly;
a first rolling unit disposed between the base and the first lens assembly; and
a second rolling unit disposed betwee the base and the second lens assembly;
wherein the first lens assembly comprises a first lens barrel and a first extension portion extending from the first lens barrel in the optical axis direction and configured to overlap the second lens assembly in a first direction perpendicular to the optical axis direction,
wherein the second lens assembly comprises a second lens barrel and a second extension portion extending from the second lens barrel in the optical axis direction and configured to overlap the first lens assembly in the first direction,
wherein the first driving unit comprises a first magnet disposed on the first lens assembly; and a first coil disposed to face the first magnet, and
wherein the first magnet is configured to overlap the first extension portion in the first direction.
2. The lens driving device according to claim 1 , wherein the first lens assembly comprises a first recess and a second recess arranged to be spaced apart in the optical axis direction, and
wherein the first rolling unit comprises a first-first rolling unit disposed in the first recess and a first-second rolling unit disposed in the second recess.
3. The lens driving device according to claim 2 , wherein the first-second rolling unit is configured to overlap the first extension portion in the first direction, and the first-first rolling unit does not to overlap the first extension portion in the first direction.
4. The lens driving device according to claim 2 , wherein the first recess and the second recess are disposed on one side of the first lens assembly, and the first magnet is disposed on another side of the first lens assembly different from the one side of the first lens assembly on which the first recess and the second recess are disposed.
5. The lens driving device according to claim 2 , wherein the first-first rolling unit and the first-second rolling unit do not overlap the first magnet in the optical axis direction.
6. The lens driving device according to claim 2 , wherein the second recess is disposed in the first extension portion, and
wherein the first recess is not disposed in the first extension portion.
7. The lens driving device according to claim 2 , wherein the first magnet is configured to overlap an area between the first recess and the second recess in a second direction perpendicular to both the optical axis direction and the first direction.
8. The lens driving device according to claim 2 , wherein a minimum gap between the first recess and the second recess is smaller than a length of the first magnet in the optical axis direction.