Patent ID: 7184181

Claim:
A scanning module capable of finely tuning an optical length, comprising: a lamp tube for providing a required light source for a document to be scanned; a base having a reflective mirror set and a camera lens, said reflective mirror set receiving light from said document and transmitting the light to said camera lens for focusing, and an opening disposed outside said base for outputting the light focused by said camera lens; a photosensitive substrate for performing image processing of the light focused by said camera lens; and an adjustment unit for adjusting the optical length between said base and said photosensitive substrate, said adjustment unit comprising: a first connection portion for adjusting said optical length and disposed beside said opening; and a second connection portion disposed on said photosensitive substrate, said second connection portion being screwed onto said first connection portion so that said base and said photosensitive substrate are connected and fixed together.