Patent ID: 7345836

Claim:
A lens driving apparatus, comprising: a first lens group, having a first lens; a second lens group, having a second lens; at least two guide rods, passing through said first lens group and said second lens group to let said first lens group and said second lens group move along said guide rods; a guide pin, formed on said second lens group; a follower, formed with a leading rack and a guide slot corresponding to said guide pin; a gear cluster, engaged with said leading rack; and a rack, having one end fixed to said first lens group, and a plurality of teeth engaged with said gear cluster; wherein, upon said first lens group moving along said guide rods, said plurality of teeth of said rack revolves said gear cluster to move said leading rack of said follower, and let said guide slot move along said guide pin to cause said second lens group to move along said guide rods, resulting in a relative distance between said first lens group and said second lens group being changed according to said guide slot.