Zooming actuator having dual structure

A dual set-up zoom actuator comprising:

• a first carrier having a first lens attached thereto and movable along an optical axis;
• a second carrier having a second lens attached thereto, said second carrier being capable of moving anterior or posterior to the first carrier along the optical axis;
• a housing enclosing the first and second carriers;
• a first coil unit equipped to the housing and having n first coils disposed anterior or posterior along the optical axis, wherein n is a natural number equal to or greater than two;
• a second coil unit equipped to the housing at a location different than the first coil unit and having n+1 second coils disposed anterior or posterior along the optical axis;
• a first magnet having n+1 magnetic poles facing the first coil unit and mounted on the first carrier;
• and
• a second magnet having n magnetic poles facing the second coil unit and mounted on the second carrier,
• wherein each of the n+1 second coils is wound to a track-shaped form comprising an upside and a bottomside, said upside and bottomside formed along a direction perpendicular to the optical axis, and
• for each trio of three consecutive second coils consisting of a higher second coil, a middle second coil placed in the middle and a lower second coil placed at a location lower than the middle second coil,
• the bottomside of the higher second coil and the upside of the middle second coil face the higher magnetic pole from the pair of two consecutive magnetic poles out of the n magnetic poles of the second magnet, and
• the bottomside of the middle second coil and the upside of the lower second coil face the lower magnetic pole from the pair of two consecutive magnetic poles out of the n magnetic poles of the second magnet.