The Computerized Radiography is an outcome of the rapid development of computer and laser technologies

and one of its core components is the laser scanning optical system. Fθ lens

optical beam expander

and optical scanner in the laser scanning system are discussed in detailed

and some key issues of the scanning system are presented and resolved

such as the influence of the stop position on image quality

factors of influencing spot size

and determination of the form of optical scanner. Finally

the laser scanning optical system is designed by using the ZEMAX software

and good design results are obtained

wherein the spot diameter is smaller than 0.1mm

and focal length and field of view meet linearity relationship. The design results show that on-axis and off-axis aberrations of the designed laser scanning lens are almost equal

and the image quality achieves the diffraction limit.