扫描仪基本知识（Scanner basic knowledge）.doc

扫描仪基本知识（Scanner basic knowledge） Scanner basic knowledge Tsinghua unido The 1995-06-16 The scanner is a high - tech product of electro-mechanical integration. It is an important tool to input various forms of image information into the computer. It is the third generation of computer input devices after the keyboard and mouse. It is also an extremely powerful input device. People often use the scanner for computer image input, from the most direct picture to all kinds of drawings, photographs, film graphics and all kinds of text information can use scanner input to the computer to realize the image in the form of information processing, management, use, storage, output etc. The scanner has been widely used in all kinds of graphic image processing, publishing, printing, advertising, office automation, multimedia, graphic database, graphic communication, engineering drawings input and many other fields. What are the parts of the scanner? How does it work? The scanner consists mainly of optical imaging, mechanical transmission and conversion circuit. These parts cooperate to transform the light signal from the image feature into an acceptable electrical signal for the computer. The core of the scanner is the photoelectric conversion component that completes the photoelectric conversion. Most of the photoelectric conversion parts currently used by scanners are so-called charge-coupled devices (CCD). It can convert the light signals on it to the corresponding electrical signals. The composition of other main parts is: light source, optical path and lens of optical imaging part; A/D conversion processing circuit and control circuit and mechanical driving mechanism of the motor control circuit and mechanical driving mechanism of A/D control circuit and the stepper motor, scanning head and guide rail. When the scanner works, the light illuminates the reflected light (reflected draft) or transmitted light (transmitted) by the light source. Optical system to collect the light