Patent ID: 7450836

Claim:
An imaging device comprising: a lens including a zoom lens and a focus lens; an image sensor for outputting an imaging result of an optical image formed by said lens; signal processing means for processing said imaging result to output a video signal; detecting means for processing said video signal to output an evaluation value indicative of the degree of focusing; a memory for storing data of an imaging range where a focused image is ensured, by using a cam curve of said lens; and control means for moving said focus lens in concert with said zoom lens; wherein when a focal depth detected according to a current position of said zoom lens is less than said imaging range at said current position of said zoom lens, said control means performs autofocus control using said evaluation value to move said focus lens; and when said focal depth is greater than said imaging range at said current position of said zoom lens, said control means performs focus control by said cam curve to move said focus lens.