Patent ID: 8305702

Claim:
A voice coil motor comprising: a fixed body, the fixed body comprising a first receiving cavity, at least one upper recess, and at least one lower recess, the at least one upper recess and the at least one lower recess being respectively arranged at opposite ends of the fixed body, and communicating with the first receiving cavity; a movable barrel received in the first receiving cavity and movable relative to the fixed body; at least two upper rollers engagingly received in the at least one upper recess, the at least two upper rollers engaged with the movable barrel, and configured for applying first friction forces to the movable barrel; and at least two lower rollers engagingly received in the at least one lower recess, the at least two lower rollers engaged with the movable barrel, and configured for applying second friction forces onto the movable barrel, the first and second friction forces being sufficient to cooperatively retain the movable barrel in the fixed body.