Scanning module and the method thereof

Abstract

The present invention relates to a scanning module, which is capable of integrating optical paths of illuminating and imaging for size reduction, and improving the quality of scanned image by using optical polarizers for filtering, and further achieving the same effect as the 'projection scanning' digital camera. The scanning module comprises: a light source, a first polarizer, a quarter-wave plate, a polarizing beamsplitter, an image detection device, and a second polarizer. The light from the light source consists of both a first-polarized and a second-polarized light. The first polarizer is placed in front of the light source that only allows the first-polarized light to pass through. The optics unit directs the first-polarized light to a scanning object and transforms the reflected light into the second-polarized light before receiveded by the image detection device for image acquiring. The second polarizer is placed between the optics unit and the image detection device for allowing only the second-polarized light to pass through such that the influence on the image detection device from the light source can be eliminated.