Patent ID: 7495843

Claim:
A focus adjusting mechanism for use in a portable electronic device with a lens module, the lens module comprising a lens barrel and a lens barrel holder, the lens barrel being threaded into the barrel holder, the focus adjusting mechanism comprising: a driving member, the driving member having a plurality of circumferential teeth formed thereon; a follower, the follower having a plurality of linear teeth formed thereon, the linear teeth meshing with the circumferential teeth to transform a rotation of the driving member to a linear movement of the follower; and a transmission rod, the transmission rod being disposed between the follower and the lens barrel to transform the linear movement of the follower into a rotation of the lens barrel relative to the lens barrel holder; wherein the transmission rod comprises a stepped portion, the lens barrel comprises a threaded body, the threaded body having a stepped groove defined therein, the stepped portion being securely held in the stepped groove wherein the transmission rod further comprises a protrusion, the follower further comprises a through groove, the protrusion being formed opposite to the steeped portion, the through groove being defined opposite to the linear teeth, the protrusion engaging in the through groove.