Patent ID: 7450321
Filing Date: 2008-11-11
Classification: G02B

Abstract:
1. A lens module, comprising: a guide rod set; a first lens barrel, movably disposed on the guide rod set; at least one first lens, disposed inside the first lens barrel; a first optical grating, connected to the first lens barrel; a first position sensor, disposed near the first lens barrel, wherein the first position sensor comprises a first light-emitting device and a first photosensor opposite to the first light-emitting device, and the first optical grating is disposed between the first light-emitting device and the first photosensor; and a first voice coil motor, disposed near the first lens barrel, the first voice coil motor comprising: wherein when a current is provided into the first coil unit, the force-at-a-distance generated between the first coil unit and the first magnet urges the first coil unit moving along the first bar, so as to drive the first lens barrel to move along the guide rod set.