Camera module

1. A camera module having an auto focus adjustment function, comprising:

a housing;

a barrel elastically supported within the housing;

a lens unit inserted in the housing and including at least one lens;

a VCM (Voice Coil Motor) actuator attached to the barrel for generating a force to linearly move the lens unit with the barrel for an auto focus adjustment;

an infrared filter inserted in the barrel for removing an infrared component of light; and

an image sensor discretely positioned from the lens unit to convert an optical image filtered by the infrared filter to an electrical signal,

wherein the VCM actuator moves the position of the lens to adjust an initial position of the lens by using a gap of reference distance position value caused by tolerance or a lens position value to a focus-matched point of the camera module.

2. The camera module of claim 1 , wherein the VCM actuator includes a VCM actuator driver for driving the VCM actuator, where the VCM actuator driver includes the gap of reference distance position value or the information on the lens position value.

3. The camera module of claim 2 , wherein the VCM actuator includes a magnet forming a magnetic flux, a coil discretely positioned from the magnet, and attached to a periphery of the barrel, and a yoke for attaching the magnet and the coil.

4. The camera module of claim 3 , wherein the VCM actuator driver is connected to the coil to move the barrel attached with the coil by controlling a current flowing in the coil.

5. The camera module of claim 2 , wherein the gap of the reference distance position value and the information on the lens position value are obtained by calibration of the reference distance position value.

6. A camera module, comprising:

a lens unit including at least one lens;

a barrel into which the lens unit is inserted; and

a barrel-connected VCM (Voice Coil Motor) actuator for moving the position of the lens to adjust an initial position of the lens by using a gap of a reference distance position value which is a position of a lens focus-matched object or information on a lens position value at a focus-matched point.

7. The camera module of claim 6 , wherein the VCM actuator includes a VCM actuator driver for driving the VCM actuator, where the VCM actuator driver includes the gap of reference distance position value or the information on the lens position value.

8. The camera module of claim 7 , wherein the VCM actuator includes a magnet forming a magnetic flux, a coil discretely positioned from the magnet, and attached to the barrel, and a yoke for attaching the magnet and the coil.

9. The camera module of claim 8 , wherein the VCM actuator driver is connected to the coil to move the barrel attached with the coil by controlling a current flowing in the coil.

10. The camera module of claim 6 , wherein the gap of the reference distance position value and the information on the lens position value are obtained by calibration of the reference distance position value.

11. The camera module of claim 6 , wherein the lens unit includes a plurality of lenses, a blocking member for blocking light in the plurality of lenses, and a spacer maintaining a gap in the plurality of lenses.

12. The camera module of claim 6 , wherein the VCM actuator includes a coil wound along a circumference of the barrel, a magnet discretely positioned from the coil to form a magnetic flux and a yoke for attaching the magnet and the coil.

13. The camera module of claim 12 , wherein the coil is attached to the periphery of the barrel.

14. The camera module of claim 12 , wherein the VCM actuator further includes an inner yoke wound by the coil.

15. The camera module of claim 14 , wherein the VCM actuator further includes an outer yoke attached by the magnet.

16. The camera module of claim 15 , wherein the inner yoke and the outer yoke are connected by a yoke support.

17. The camera module of claim 16 , wherein the inner yoke, the outer yoke and the barrel are positioned inside a housing.

18. The camera module of claim 17 , wherein the barrel is elastically supported within the housing by a spring.

19. The camera module of claim 6 , wherein an image sensor is discretely positioned from the lens unit to convert light having passed the lens unit to an electrical signal.

20. The camera module of claim 19 , wherein an infrared filter is inserted between the barrel and the image sensor for removing an infrared component of light.