Patent ID: 8213099

Claim:
A miniature auto-focusing lens device, defined with a central axis and comprising: at least a casing provided therein with a receiving space; a movable lens set comprising at least a lens and disposed in the receiving space; an electromagnetic driving module provided in the receiving space and configured to drive the movable lens set to perform focusing and displacement; a fixed lens set comprising at least a lens and corresponding in position to the movable lens set; an image sensing module provided in the receiving space for receiving images focused by the movable lens set and the fixed lens set, constructed on and electrically connected to a circuit board; wherein the movable lens set, the fixed lens set and the image sensing module are arranged in the receiving space with the fixed lens set between the movable lens set and the image sensing module; wherein the movable lens set and the fixed lens set together form an optical system of the miniature auto-focusing lens device so as to perform optical focusing and imaging, and the at least a lens of the fixed lens set is of dimensions larger than any one of the at least a lens of the movable lens set; wherein the casing comprises a first casing and a second casing, the receiving space being provided in the first casing, the movable lens set and electromagnetic driving module being disposed in the receiving space of the first casing, while the fixed lens set being provided in the second casing, and a maximum width of the first casing and the second casing being less than 15 mm; wherein the miniature auto-focusing lens device further comprises a lens carrier configured to carry the movable lens set therein and provided, internally and circumferentially, with a plurality of internal threads in screw-engagement with a plurality of external threads circumferentially provided on the movable lens set; and wherein the first casing is peripherally provided with a plurality of fixing frames paired, opposite, and equidistantly spaced apart from each other, and the electromagnetic driving module comprises a plurality of magnets and a drive coil, the magnets being embedded in and fixed to the fixing frames peripherally provided to the first casing, and the drive coil encircling the lens carrier and being separated from the magnets provided inside the fixing frames by a preset gap.