Patent ID: 7634183
Filing Date: 2009-12-15
Classification: G02B,G03B

Abstract:
1. A focus adjustable method, comprising steps of: allowing an external light beam to pass through a lens module, thereby generating an optical image; obtaining focus values UR, UL, DR and DL of said optical image at four corners thereof respectively; performing a first image analysis procedure to obtain an image diagonal spinor D according to one of the formulas: D=(DR+UL)−(UR+DL) or D=(DR+UL)−(UR+DL)/4; determining optical systematic errors of said lens module according to said image diagonal spinor D; performing a second image analysis procedure to obtain a two-dimensional geometric tilt vector T(X,Y) according to the formulas: T(X,Y)=(X correcting a tilt phenomenon of said lens module according to said two-dimensional geometric tilt vector T(X,Y) so as to achieve a more uniform focusing effect of said optical image.