Patent ID: 8077411
Filing Date: 2011-12-13
Classification: G02B

Abstract:
1. An auto-focusing lens module, comprising: a housing; a lens having a lens group; a lens holder holding the lens arranged in the housing and along an optical axis; and a lens displacement mechanism, also arranged in the housing, for moving and sliding the lens towards or away from an object side for auto-focusing, the lens displacement mechanism comprising: at least one shaped memory alloy (SMA) wire; wherein the at least one SMA wire having two opposite ends and an intermediate movable portion between the two opposite ends is controlled by a control current to drive the moving and sliding lens, the two opposite ends being fixed and a longitudinal mid-point of the intermediate movable portion being hooked on a corresponding hook arranged on an outer edge of the lens holder so as to tighten the intermediate movable portion between the two opposite ends, and wherein when the at least one SMA wire is heated by control current, the intermediate movable portion contracts to pull the hook so as to drive the moving and sliding lens along the optical axis for auto-focusing.