Patent ID: 7570880
Filing Date: 2009-08-04
Classification: G02B,G03B,H04N

Abstract:
1. An auto focus control apparatus of a camera module, the auto focus control apparatus comprising: a sensor assembly having an image sensor, wherein the image sensor is mounted on a flexible printed circuit board; an infrared filter provided on an upper portion of the image sensor; a lens housing to which a plurality of permanent magnets are mounted on an inner wall, the plurality of magnets being further mounted to an upper portion of the sensor assembly; a coil mounted in the lens housing; a lens barrel; a plurality of focus control lenses mounted to the lens barrel in a direction of an optical axis; a lens guide portion integral to the lens housing and providing a displacement chamber for guiding the lens barrel to guide the lens barrel linearly in the direction of the optical axis, responsive to an electromagnetive force sourced from electric fields of the coil and the plurality of permanent magnets; a lens stopper unit for mounting the lens barrel to the lens housing for separating the lenses from the sensor by a predetermined distance in the direction of the optical axis to secure an initial resolution of the lenses; and at least one lens resilient means provided on an upper end surface of the lens barrel for maintaining a distance (L at least one coil holder portion protruding in a direction perpendicular to the optical axis proximal to the permanent magnets and formed at an outer portion of the lens barrel, wherein said coil is wound around said coil holder portion in a direction perpendicular to the optical axis (A