AUTOMATIC FOCUS AND ZOOM MODULE, BACKLASH PREVENTION METHOD, MOBILE ASSEMBLY, PERSONAL ELECTRONIC EQUIPMENT, DRIVING METHOD FOR OPTICAL GROUP OF AUTOMATIC FOCUS AND ZOOM MODULE, POSITION SENSING SYSTEM, POSITION SENSING METHOD, STABILIZATION SYSTEM AND OPTICAL MODULE

摘要

PROBLEM TO BE SOLVED: To prevent backlash.SOLUTION: An optical module includes: a first optical group; a second optical group; and an image sensor, and the first optical group and the second optical group provide an image having a focus and magnification to the image sensor. In several embodiments, a first optical assembly includes: a first optical group connected to the screw portion of a first lead screw so as to be moved along the shaft of the first lead screw in accordance with the rotation of the first lead screw; a first actuator for rotating the first lead screw; and a first sensing object for detecting the rotation of the first lead screw. In several embodiments, a second optical assembly includes: a second optical group connected to the screw part of a second lead screw so as to be moved along the shaft of the second lead screw in accordance with the rotation of the second lead screw; a second actuator for rotating the second lead screw; and second sensing means for detecting the rotation of the second lead screw.