KHM-313CAB Optical Laser Lens Head with Mechanism

you may be wondering what this thing I have in my hand is and/or you may have be familiar with it it's a optical head out of a DVD player and what we're looking at is this clear part out here is the lens and just do a brief tour here two electromagnets one two as you can see there's a permanent magnet there so there's a permanent magnet here's a permanent magnet and two electromagnet and so we can get it turned this and this act is the spring and you can see that it will go up and down like this like that what you can also see is it will go left and right so this will allow it to go back and forth across many tracks and the up and down motion allows it to focus the laser for reading and writing onto the disk so between these two motions the this is the fine movement so this will go from track to track now if you want to do big movements they have a they have a linear motor and a steppin