Patent ID: 8804251
Filing Date: 2014-08-12
Classification: G02B

Abstract:
1. An auto-focus method configured for controlling a focusing lens of a lens module to move to an optimal focused position X p , comprising: assigning searching boundaries InitL, InitR of the focusing lens to L, R respectively; acquiring the resolutions f(L), f(R) of images captured by the lens module when the focusing lens is positioned on the two searching boundaries InitL, InitR, wherein f(X) represents the resolution of the image captured by the lens module when the focusing lens is positioned on a focused position X, X is a variable value greater than InitL and lower than InitR; defining two focused positions X acquiring the resolutions f(X comparing f(X determining that L=X determining that R=X determining whether or not L≠InitL and R≠InitR are established; acquiring the focused positions L, X calculating the optimal focused position X