Camera module
A camera module includes a housing; a lens module provided in an internal space of the housing to be movable in an optical axis direction, and including at least one lens therein; a magnet disposed in the lens module; and position detection sensors to detect a position of the magnet. One or more of the position detection sensors are disposed to face a first polarity of the magnet and one or more of the position detection sensors are disposed to face a second polarity of the magnet different than the first polarity.
1. A camera module comprising:
a housing;
a first lens module and a second lens module each movably disposed inside the housing along an optical axis;
at least one first ball member disposed between the first lens module and the housing;
at least one second ball member disposed between the second lens module and the housing;
a first driving unit configured to move the first lens module along the optical axis; and
a second driving unit configured to move the second lens module along the optical axis,
wherein the first driving unit comprises a first magnet disposed on the first lens module, a first coil disposed to face the first magnet and a plurality of first position sensors located inside the first coil,
wherein the first lens module includes a first extension portion extending in an optical axis direction to overlap with the second lens module in a direction perpendicular to the optical axis, and
wherein at least a portion of the first magnet is disposed on the first extension portion.
2. The camera module of claim 1 , wherein the plurality of first position sensors are spaced apart from each other in the optical axis direction.
3. The camera module of claim 1 , wherein at least one guide groove is disposed on the first lens module; and
the at least one first ball member is at least partially accommodated in the at least one guide groove.
4. The camera module of claim 3 , wherein the at least one guide groove extends in the optical axis direction.
5. The camera module of claim 3 , wherein the at least one guide groove includes a first guide groove disposed on a surface of the first lens module and a second guide groove disposed on the surface and extending in parallel with the first guide groove.
6. The camera module of claim 1 , further comprising a pulling yoke disposed on the housing to pull the first lens module.
7. The camera module of claim 1 , wherein the first magnet is disposed oppositely at a side surface of the housing.
8. The camera module of claim 1 , wherein a surface of the first magnet facing the first coil has an N pole, a neutral region and an S pole along the optical axis direction.
9. The camera module of claim 8 , wherein at least one of the plurality of first position sensors is disposed to face the N pole of the first magnet, and at least another one of the plurality of first position sensors is disposed to face the S pole of the first magnet.
10. The camera module of claim 1 , wherein the second driving unit comprises a second magnet disposed on the second lens module, a second coil disposed to face the second magnet and a plurality of second position sensors located inside the second coil,
wherein the second lens module includes a second extension portion extending in the optical axis direction to overlap with the first lens module in the direction perpendicular to the optical axis, and
wherein at least a portion of the second magnet is disposed on the second extension portion.
11. The camera module of claim 10 , wherein the plurality of second position sensors are spaced apart from each other in the optical axis direction.
12. The camera module of claim 10 , wherein at least one guide groove is disposed on the second lens module; and
the at least one second ball member is at least partially accommodated in the at least one guide groove.
13. The camera module of claim 12 , wherein the at least one guide groove extends in the optical axis direction.
14. The camera module of claim 12 , wherein the at least one guide groove includes a third guide groove disposed on a surface of the second lens module and a fourth guide groove disposed on the surface and extending in parallel with the third guide groove.
15. The camera module of claim 10 , further comprising a pulling yoke disposed on the housing to pull the second lens module.
16. The camera module of claim 10 , wherein the second magnet is disposed oppositely at a side surface of the housing.
17. The camera module of claim 10 , wherein a surface of the second magnet facing the second coil has an N pole, a neutral region and an S pole along the optical axis direction.
18. The camera module of claim 17 , wherein at least one of the plurality of second position sensors is disposed to face the N pole of the second magnet, and at least another one of the plurality of second position sensors is disposed to face the S pole of the second magnet.
19. The camera module of claim 10 , wherein the first extension portion is oppositely disposed at the second extension portion with the optical axis therebetween.
20. The camera module of claim 1 , wherein one of the first lens module and the second lens module is configured to handle an autofocus (AF) function, and the other one is configured to handle a zoom function.