AUTOFOCUS DEVICE AND METHOD FOR CONTROLLING OPERATION OF SAME

摘要

The purpose of the present invention is to take advantage of the characteristics of light path length difference AF and phase difference AF. A focus lens is moved using phase difference AF until the focus lens enters a range in which light path length difference AF is used. When the focus lens enters the range in which light path length difference AF is used, the focus lens is positioned in a focal position (P0) using light path length difference AF. If the focus lens is within the allowable range for focal positioning but outside of the range for light path length difference AF because of changes in the scene being imaged or the like, the focus lens is once again moved using phase difference AF.