Patent ID: 8305482
Filing Date: 2012-11-06
Classification: G02B,H01L

Abstract:
1. A camera module comprising: an optical assembly comprising an optical lens group and a lens barrel housing the optical lens group, the optical lens group having an optical axis associated therewith; an image sensor having a light sensing surface, the light sensing surface being arranged perpendicular to the optical axis; a barrel holder in which the optical assembly and the image sensor are housed; an angle measurement assembly for measuring perpendicularity of the optical axis to the light sensing surface of the image sensor; a perpendicularity adjustment assembly arranged between the optical assembly and the barrel holder, the perpendicularity adjustment assembly comprising an electrostrictive member, a movable member and a base plate, a through hole defined through a first surface and an opposite second surface of the base plate, the through hole having a principal axis parallel to the light sensing surface of the image sensor, the electrostrictive member comprising first and second annular electrostrictive pieces, the first and second annular electrostrictive pieces being spaced apart from each other in a direction parallel to the principal axis, the first electrostrictive piece adjacent to the optical assembly and tapering in a direction away from the optical assembly, the second electrostrictive piece at an opposite side of the first electrostrictive piece to the optical assembly and tapering in a direction toward the optical assembly, the electrostrictive member being received in the through hole, the electrostrictive member interconnecting the movable member with the base plate, the base plate being fixed on the barrel holder and the movable member being fixed on the optical assembly, the electrostrictive member being extendable along the principal axis of the through hole in response to a voltage, to move the movable member away from the base plate, thereby adjusting the perpendicularity of the optical axis to the light sensing surface; and a controller for providing the voltage to the perpendicularity adjustment assembly to deform the electrostrictive member.